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webkit / WebKit / afd67199abe06221d388d48f5f044b9b3497ad05 / . / Source / WebCore / rendering / RenderBlock.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2007 David Smith (catfish.man@gmail.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "RenderBlock.h"
#include "AXObjectCache.h"
#include "ColumnInfo.h"
#include "Document.h"
#include "Editor.h"
#include "Element.h"
#include "FloatQuad.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLNames.h"
#include "HitTestLocation.h"
#include "HitTestResult.h"
#include "InlineIterator.h"
#include "InlineTextBox.h"
#include "LayoutRepainter.h"
#include "LogicalSelectionOffsetCaches.h"
#include "OverflowEvent.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderBoxRegionInfo.h"
#include "RenderCombineText.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderFlexibleBox.h"
#include "RenderInline.h"
#include "RenderLayer.h"
#include "RenderMarquee.h"
#include "RenderNamedFlowThread.h"
#include "RenderRegion.h"
#include "RenderTableCell.h"
#include "RenderTextFragment.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "SVGTextRunRenderingContext.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "TransformState.h"
#include <wtf/StackStats.h>
#include <wtf/TemporaryChange.h>
#if ENABLE(CSS_SHAPES)
#include "ExclusionShapeInsideInfo.h"
#include "ExclusionShapeOutsideInfo.h"
#endif
using namespace std;
using namespace WTF;
using namespace Unicode;
namespace WebCore {
using namespace HTMLNames;
struct SameSizeAsRenderBlock : public RenderBox {
void* pointers[2];
RenderObjectChildList children;
RenderLineBoxList lineBoxes;
uint32_t bitfields;
};
COMPILE_ASSERT(sizeof(RenderBlock) == sizeof(SameSizeAsRenderBlock), RenderBlock_should_stay_small);
struct SameSizeAsFloatingObject {
void* pointers[2];
LayoutRect rect;
int paginationStrut;
uint32_t bitfields : 8;
};
COMPILE_ASSERT(sizeof(RenderBlock::MarginValues) == sizeof(LayoutUnit[4]), MarginValues_should_stay_small);
struct SameSizeAsMarginInfo {
uint32_t bitfields : 16;
LayoutUnit margins[2];
};
typedef WTF::HashMap<const RenderBox*, OwnPtr<ColumnInfo> > ColumnInfoMap;
static ColumnInfoMap* gColumnInfoMap = 0;
static TrackedDescendantsMap* gPositionedDescendantsMap = 0;
static TrackedDescendantsMap* gPercentHeightDescendantsMap = 0;
static TrackedContainerMap* gPositionedContainerMap = 0;
static TrackedContainerMap* gPercentHeightContainerMap = 0;
typedef WTF::HashMap<RenderBlock*, OwnPtr<ListHashSet<RenderInline*> > > ContinuationOutlineTableMap;
typedef WTF::HashSet<RenderBlock*> DelayedUpdateScrollInfoSet;
static int gDelayUpdateScrollInfo = 0;
static DelayedUpdateScrollInfoSet* gDelayedUpdateScrollInfoSet = 0;
static bool gColumnFlowSplitEnabled = true;
bool RenderBlock::s_canPropagateFloatIntoSibling = false;
// This class helps dispatching the 'overflow' event on layout change. overflow can be set on RenderBoxes, yet the existing code
// only works on RenderBlocks. If this change, this class should be shared with other RenderBoxes.
class OverflowEventDispatcher {
WTF_MAKE_NONCOPYABLE(OverflowEventDispatcher);
public:
OverflowEventDispatcher(const RenderBlock* block)
: m_block(block)
, m_hadHorizontalLayoutOverflow(false)
, m_hadVerticalLayoutOverflow(false)
{
m_shouldDispatchEvent = !m_block->isAnonymous() && m_block->hasOverflowClip() && m_block->document()->hasListenerType(Document::OVERFLOWCHANGED_LISTENER);
if (m_shouldDispatchEvent) {
m_hadHorizontalLayoutOverflow = m_block->hasHorizontalLayoutOverflow();
m_hadVerticalLayoutOverflow = m_block->hasVerticalLayoutOverflow();
}
}
~OverflowEventDispatcher()
{
if (!m_shouldDispatchEvent)
return;
bool hasHorizontalLayoutOverflow = m_block->hasHorizontalLayoutOverflow();
bool hasVerticalLayoutOverflow = m_block->hasVerticalLayoutOverflow();
bool horizontalLayoutOverflowChanged = hasHorizontalLayoutOverflow != m_hadHorizontalLayoutOverflow;
bool verticalLayoutOverflowChanged = hasVerticalLayoutOverflow != m_hadVerticalLayoutOverflow;
if (horizontalLayoutOverflowChanged || verticalLayoutOverflowChanged) {
if (FrameView* frameView = m_block->document()->view())
frameView->scheduleEvent(OverflowEvent::create(horizontalLayoutOverflowChanged, hasHorizontalLayoutOverflow, verticalLayoutOverflowChanged, hasVerticalLayoutOverflow), m_block->node());
}
}
private:
const RenderBlock* m_block;
bool m_shouldDispatchEvent;
bool m_hadHorizontalLayoutOverflow;
bool m_hadVerticalLayoutOverflow;
};
// Our MarginInfo state used when laying out block children.
RenderBlock::MarginInfo::MarginInfo(RenderBlock* block, LayoutUnit beforeBorderPadding, LayoutUnit afterBorderPadding)
: m_atBeforeSideOfBlock(true)
, m_atAfterSideOfBlock(false)
, m_hasMarginBeforeQuirk(false)
, m_hasMarginAfterQuirk(false)
, m_determinedMarginBeforeQuirk(false)
, m_discardMargin(false)
{
RenderStyle* blockStyle = block->style();
ASSERT(block->isRenderView() || block->parent());
m_canCollapseWithChildren = !block->isRenderView() && !block->isRoot() && !block->isOutOfFlowPositioned()
&& !block->isFloating() && !block->isTableCell() && !block->hasOverflowClip() && !block->isInlineBlockOrInlineTable()
&& !block->isRenderFlowThread() && !block->isWritingModeRoot() && !block->parent()->isFlexibleBox()
&& blockStyle->hasAutoColumnCount() && blockStyle->hasAutoColumnWidth() && !blockStyle->columnSpan();
m_canCollapseMarginBeforeWithChildren = m_canCollapseWithChildren && !beforeBorderPadding && blockStyle->marginBeforeCollapse() != MSEPARATE;
// If any height other than auto is specified in CSS, then we don't collapse our bottom
// margins with our children's margins. To do otherwise would be to risk odd visual
// effects when the children overflow out of the parent block and yet still collapse
// with it. We also don't collapse if we have any bottom border/padding.
m_canCollapseMarginAfterWithChildren = m_canCollapseWithChildren && (afterBorderPadding == 0) &&
(blockStyle->logicalHeight().isAuto() && !blockStyle->logicalHeight().value()) && blockStyle->marginAfterCollapse() != MSEPARATE;
m_quirkContainer = block->isTableCell() || block->isBody();
m_discardMargin = m_canCollapseMarginBeforeWithChildren && block->mustDiscardMarginBefore();
m_positiveMargin = (m_canCollapseMarginBeforeWithChildren && !block->mustDiscardMarginBefore()) ? block->maxPositiveMarginBefore() : LayoutUnit();
m_negativeMargin = (m_canCollapseMarginBeforeWithChildren && !block->mustDiscardMarginBefore()) ? block->maxNegativeMarginBefore() : LayoutUnit();
}
// -------------------------------------------------------------------------------------------------------
RenderBlock::RenderBlock(ContainerNode* node)
: RenderBox(node)
, m_lineHeight(-1)
, m_hasMarginBeforeQuirk(false)
, m_hasMarginAfterQuirk(false)
, m_beingDestroyed(false)
, m_hasMarkupTruncation(false)
, m_hasBorderOrPaddingLogicalWidthChanged(false)
{
setChildrenInline(true);
COMPILE_ASSERT(sizeof(RenderBlock::FloatingObject) == sizeof(SameSizeAsFloatingObject), FloatingObject_should_stay_small);
COMPILE_ASSERT(sizeof(RenderBlock::MarginInfo) == sizeof(SameSizeAsMarginInfo), MarginInfo_should_stay_small);
}
static void removeBlockFromDescendantAndContainerMaps(RenderBlock* block, TrackedDescendantsMap*& descendantMap, TrackedContainerMap*& containerMap)
{
if (OwnPtr<TrackedRendererListHashSet> descendantSet = descendantMap->take(block)) {
TrackedRendererListHashSet::iterator end = descendantSet->end();
for (TrackedRendererListHashSet::iterator descendant = descendantSet->begin(); descendant != end; ++descendant) {
TrackedContainerMap::iterator it = containerMap->find(*descendant);
ASSERT(it != containerMap->end());
if (it == containerMap->end())
continue;
HashSet<RenderBlock*>* containerSet = it->value.get();
ASSERT(containerSet->contains(block));
containerSet->remove(block);
if (containerSet->isEmpty())
containerMap->remove(it);
}
}
}
RenderBlock::~RenderBlock()
{
if (m_floatingObjects)
deleteAllValues(m_floatingObjects->set());
if (hasColumns())
gColumnInfoMap->take(this);
if (gPercentHeightDescendantsMap)
removeBlockFromDescendantAndContainerMaps(this, gPercentHeightDescendantsMap, gPercentHeightContainerMap);
if (gPositionedDescendantsMap)
removeBlockFromDescendantAndContainerMaps(this, gPositionedDescendantsMap, gPositionedContainerMap);
}
RenderBlock* RenderBlock::createAnonymous(Document* document)
{
RenderBlock* renderer = new (document->renderArena()) RenderBlock(0);
renderer->setDocumentForAnonymous(document);
return renderer;
}
void RenderBlock::willBeDestroyed()
{
// Mark as being destroyed to avoid trouble with merges in removeChild().
m_beingDestroyed = true;
if (!documentBeingDestroyed()) {
if (firstChild() && firstChild()->isRunIn())
moveRunInToOriginalPosition(firstChild());
}
// Make sure to destroy anonymous children first while they are still connected to the rest of the tree, so that they will
// properly dirty line boxes that they are removed from. Effects that do :before/:after only on hover could crash otherwise.
children()->destroyLeftoverChildren();
// Destroy our continuation before anything other than anonymous children.
// The reason we don't destroy it before anonymous children is that they may
// have continuations of their own that are anonymous children of our continuation.
RenderBoxModelObject* continuation = this->continuation();
if (continuation) {
continuation->destroy();
setContinuation(0);
}
if (!documentBeingDestroyed()) {
if (firstLineBox()) {
// We can't wait for RenderBox::destroy to clear the selection,
// because by then we will have nuked the line boxes.
// FIXME: The FrameSelection should be responsible for this when it
// is notified of DOM mutations.
if (isSelectionBorder())
view()->clearSelection();
// If we are an anonymous block, then our line boxes might have children
// that will outlast this block. In the non-anonymous block case those
// children will be destroyed by the time we return from this function.
if (isAnonymousBlock()) {
for (InlineFlowBox* box = firstLineBox(); box; box = box->nextLineBox()) {
while (InlineBox* childBox = box->firstChild())
childBox->remove();
}
}
} else if (parent())
parent()->dirtyLinesFromChangedChild(this);
}
m_lineBoxes.deleteLineBoxes(renderArena());
if (lineGridBox())
lineGridBox()->destroy(renderArena());
if (UNLIKELY(gDelayedUpdateScrollInfoSet != 0))
gDelayedUpdateScrollInfoSet->remove(this);
RenderBox::willBeDestroyed();
}
void RenderBlock::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
{
RenderStyle* oldStyle = style();
s_canPropagateFloatIntoSibling = oldStyle ? !isFloatingOrOutOfFlowPositioned() && !avoidsFloats() : false;
setReplaced(newStyle->isDisplayInlineType());
if (oldStyle && parent() && diff == StyleDifferenceLayout && oldStyle->position() != newStyle->position()) {
if (newStyle->position() == StaticPosition)
// Clear our positioned objects list. Our absolutely positioned descendants will be
// inserted into our containing block's positioned objects list during layout.
removePositionedObjects(0, NewContainingBlock);
else if (oldStyle->position() == StaticPosition) {
// Remove our absolutely positioned descendants from their current containing block.
// They will be inserted into our positioned objects list during layout.
RenderObject* cb = parent();
while (cb && (cb->style()->position() == StaticPosition || (cb->isInline() && !cb->isReplaced())) && !cb->isRenderView()) {
if (cb->style()->position() == RelativePosition && cb->isInline() && !cb->isReplaced()) {
cb = cb->containingBlock();
break;
}
cb = cb->parent();
}
if (cb->isRenderBlock())
toRenderBlock(cb)->removePositionedObjects(this, NewContainingBlock);
}
if (containsFloats() && !isFloating() && !isOutOfFlowPositioned() && newStyle->hasOutOfFlowPosition())
markAllDescendantsWithFloatsForLayout();
}
RenderBox::styleWillChange(diff, newStyle);
}
static bool borderOrPaddingLogicalWidthChanged(const RenderStyle* oldStyle, const RenderStyle* newStyle)
{
if (newStyle->isHorizontalWritingMode())
return oldStyle->borderLeftWidth() != newStyle->borderLeftWidth()
|| oldStyle->borderRightWidth() != newStyle->borderRightWidth()
|| oldStyle->paddingLeft() != newStyle->paddingLeft()
|| oldStyle->paddingRight() != newStyle->paddingRight();
return oldStyle->borderTopWidth() != newStyle->borderTopWidth()
|| oldStyle->borderBottomWidth() != newStyle->borderBottomWidth()
|| oldStyle->paddingTop() != newStyle->paddingTop()
|| oldStyle->paddingBottom() != newStyle->paddingBottom();
}
void RenderBlock::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderBox::styleDidChange(diff, oldStyle);
RenderStyle* newStyle = style();
#if ENABLE(CSS_SHAPES)
// FIXME: Bug 89993: Style changes should affect the ExclusionShapeInsideInfos for other render blocks that
// share the same ExclusionShapeInsideInfo
updateExclusionShapeInsideInfoAfterStyleChange(newStyle->resolvedShapeInside(), oldStyle ? oldStyle->resolvedShapeInside() : 0);
#endif
if (!isAnonymousBlock()) {
// Ensure that all of our continuation blocks pick up the new style.
for (RenderBlock* currCont = blockElementContinuation(); currCont; currCont = currCont->blockElementContinuation()) {
RenderBoxModelObject* nextCont = currCont->continuation();
currCont->setContinuation(0);
currCont->setStyle(newStyle);
currCont->setContinuation(nextCont);
}
}
propagateStyleToAnonymousChildren(true);
m_lineHeight = -1;
// After our style changed, if we lose our ability to propagate floats into next sibling
// blocks, then we need to find the top most parent containing that overhanging float and
// then mark its descendants with floats for layout and clear all floats from its next
// sibling blocks that exist in our floating objects list. See bug 56299 and 62875.
bool canPropagateFloatIntoSibling = !isFloatingOrOutOfFlowPositioned() && !avoidsFloats();
if (diff == StyleDifferenceLayout && s_canPropagateFloatIntoSibling && !canPropagateFloatIntoSibling && hasOverhangingFloats()) {
RenderBlock* parentBlock = this;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
if (curr->isRenderBlock()) {
RenderBlock* currBlock = toRenderBlock(curr);
if (currBlock->hasOverhangingFloats()) {
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
RenderBox* renderer = (*it)->renderer();
if (currBlock->hasOverhangingFloat(renderer)) {
parentBlock = currBlock;
break;
}
}
}
}
}
parentBlock->markAllDescendantsWithFloatsForLayout();
parentBlock->markSiblingsWithFloatsForLayout();
}
// It's possible for our border/padding to change, but for the overall logical width of the block to
// end up being the same. We keep track of this change so in layoutBlock, we can know to set relayoutChildren=true.
m_hasBorderOrPaddingLogicalWidthChanged = oldStyle && diff == StyleDifferenceLayout && needsLayout() && borderOrPaddingLogicalWidthChanged(oldStyle, newStyle);
}
RenderBlock* RenderBlock::continuationBefore(RenderObject* beforeChild)
{
if (beforeChild && beforeChild->parent() == this)
return this;
RenderBlock* curr = toRenderBlock(continuation());
RenderBlock* nextToLast = this;
RenderBlock* last = this;
while (curr) {
if (beforeChild && beforeChild->parent() == curr) {
if (curr->firstChild() == beforeChild)
return last;
return curr;
}
nextToLast = last;
last = curr;
curr = toRenderBlock(curr->continuation());
}
if (!beforeChild && !last->firstChild())
return nextToLast;
return last;
}
void RenderBlock::addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild)
{
RenderBlock* flow = continuationBefore(beforeChild);
ASSERT(!beforeChild || beforeChild->parent()->isAnonymousColumnSpanBlock() || beforeChild->parent()->isRenderBlock());
RenderBoxModelObject* beforeChildParent = 0;
if (beforeChild)
beforeChildParent = toRenderBoxModelObject(beforeChild->parent());
else {
RenderBoxModelObject* cont = flow->continuation();
if (cont)
beforeChildParent = cont;
else
beforeChildParent = flow;
}
if (newChild->isFloatingOrOutOfFlowPositioned()) {
beforeChildParent->addChildIgnoringContinuation(newChild, beforeChild);
return;
}
// A continuation always consists of two potential candidates: a block or an anonymous
// column span box holding column span children.
bool childIsNormal = newChild->isInline() || !newChild->style()->columnSpan();
bool bcpIsNormal = beforeChildParent->isInline() || !beforeChildParent->style()->columnSpan();
bool flowIsNormal = flow->isInline() || !flow->style()->columnSpan();
if (flow == beforeChildParent) {
flow->addChildIgnoringContinuation(newChild, beforeChild);
return;
}
// The goal here is to match up if we can, so that we can coalesce and create the
// minimal # of continuations needed for the inline.
if (childIsNormal == bcpIsNormal) {
beforeChildParent->addChildIgnoringContinuation(newChild, beforeChild);
return;
}
if (flowIsNormal == childIsNormal) {
flow->addChildIgnoringContinuation(newChild, 0); // Just treat like an append.
return;
}
beforeChildParent->addChildIgnoringContinuation(newChild, beforeChild);
}
void RenderBlock::addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild)
{
ASSERT(!continuation()); // We don't yet support column spans that aren't immediate children of the multi-column block.
// The goal is to locate a suitable box in which to place our child.
RenderBlock* beforeChildParent = 0;
if (beforeChild) {
RenderObject* curr = beforeChild;
while (curr && curr->parent() != this)
curr = curr->parent();
beforeChildParent = toRenderBlock(curr);
ASSERT(beforeChildParent);
ASSERT(beforeChildParent->isAnonymousColumnsBlock() || beforeChildParent->isAnonymousColumnSpanBlock());
} else
beforeChildParent = toRenderBlock(lastChild());
// If the new child is floating or positioned it can just go in that block.
if (newChild->isFloatingOrOutOfFlowPositioned()) {
beforeChildParent->addChildIgnoringAnonymousColumnBlocks(newChild, beforeChild);
return;
}
// See if the child can be placed in the box.
bool newChildHasColumnSpan = newChild->style()->columnSpan() && !newChild->isInline();
bool beforeChildParentHoldsColumnSpans = beforeChildParent->isAnonymousColumnSpanBlock();
if (newChildHasColumnSpan == beforeChildParentHoldsColumnSpans) {
beforeChildParent->addChildIgnoringAnonymousColumnBlocks(newChild, beforeChild);
return;
}
if (!beforeChild) {
// Create a new block of the correct type.
RenderBlock* newBox = newChildHasColumnSpan ? createAnonymousColumnSpanBlock() : createAnonymousColumnsBlock();
children()->appendChildNode(this, newBox);
newBox->addChildIgnoringAnonymousColumnBlocks(newChild, 0);
return;
}
RenderObject* immediateChild = beforeChild;
bool isPreviousBlockViable = true;
while (immediateChild->parent() != this) {
if (isPreviousBlockViable)
isPreviousBlockViable = !immediateChild->previousSibling();
immediateChild = immediateChild->parent();
}
if (isPreviousBlockViable && immediateChild->previousSibling()) {
toRenderBlock(immediateChild->previousSibling())->addChildIgnoringAnonymousColumnBlocks(newChild, 0); // Treat like an append.
return;
}
// Split our anonymous blocks.
RenderObject* newBeforeChild = splitAnonymousBoxesAroundChild(beforeChild);
// Create a new anonymous box of the appropriate type.
RenderBlock* newBox = newChildHasColumnSpan ? createAnonymousColumnSpanBlock() : createAnonymousColumnsBlock();
children()->insertChildNode(this, newBox, newBeforeChild);
newBox->addChildIgnoringAnonymousColumnBlocks(newChild, 0);
return;
}
RenderBlock* RenderBlock::containingColumnsBlock(bool allowAnonymousColumnBlock)
{
RenderBlock* firstChildIgnoringAnonymousWrappers = 0;
for (RenderObject* curr = this; curr; curr = curr->parent()) {
if (!curr->isRenderBlock() || curr->isFloatingOrOutOfFlowPositioned() || curr->isTableCell() || curr->isRoot() || curr->isRenderView() || curr->hasOverflowClip()
|| curr->isInlineBlockOrInlineTable())
return 0;
// FIXME: Tables, RenderButtons, and RenderListItems all do special management
// of their children that breaks when the flow is split through them. Disabling
// multi-column for them to avoid this problem.
if (curr->isTable() || curr->isRenderButton() || curr->isListItem())
return 0;
RenderBlock* currBlock = toRenderBlock(curr);
if (!currBlock->createsAnonymousWrapper())
firstChildIgnoringAnonymousWrappers = currBlock;
if (currBlock->style()->specifiesColumns() && (allowAnonymousColumnBlock || !currBlock->isAnonymousColumnsBlock()))
return firstChildIgnoringAnonymousWrappers;
if (currBlock->isAnonymousColumnSpanBlock())
return 0;
}
return 0;
}
RenderBlock* RenderBlock::clone() const
{
RenderBlock* cloneBlock;
if (isAnonymousBlock()) {
cloneBlock = createAnonymousBlock();
cloneBlock->setChildrenInline(childrenInline());
}
else {
RenderObject* cloneRenderer = toElement(node())->createRenderer(renderArena(), style());
cloneBlock = toRenderBlock(cloneRenderer);
cloneBlock->setStyle(style());
// This takes care of setting the right value of childrenInline in case
// generated content is added to cloneBlock and 'this' does not have
// generated content added yet.
cloneBlock->setChildrenInline(cloneBlock->firstChild() ? cloneBlock->firstChild()->isInline() : childrenInline());
}
cloneBlock->setFlowThreadState(flowThreadState());
return cloneBlock;
}
void RenderBlock::splitBlocks(RenderBlock* fromBlock, RenderBlock* toBlock,
RenderBlock* middleBlock,
RenderObject* beforeChild, RenderBoxModelObject* oldCont)
{
// Create a clone of this inline.
RenderBlock* cloneBlock = clone();
if (!isAnonymousBlock())
cloneBlock->setContinuation(oldCont);
if (!beforeChild && isAfterContent(lastChild()))
beforeChild = lastChild();
// If we are moving inline children from |this| to cloneBlock, then we need
// to clear our line box tree.
if (beforeChild && childrenInline())
deleteLineBoxTree();
// Now take all of the children from beforeChild to the end and remove
// them from |this| and place them in the clone.
moveChildrenTo(cloneBlock, beforeChild, 0, true);
// Hook |clone| up as the continuation of the middle block.
if (!cloneBlock->isAnonymousBlock())
middleBlock->setContinuation(cloneBlock);
// We have been reparented and are now under the fromBlock. We need
// to walk up our block parent chain until we hit the containing anonymous columns block.
// Once we hit the anonymous columns block we're done.
RenderBoxModelObject* curr = toRenderBoxModelObject(parent());
RenderBoxModelObject* currChild = this;
RenderObject* currChildNextSibling = currChild->nextSibling();
while (curr && curr != fromBlock) {
ASSERT_WITH_SECURITY_IMPLICATION(curr->isRenderBlock());
RenderBlock* blockCurr = toRenderBlock(curr);
// Create a new clone.
RenderBlock* cloneChild = cloneBlock;
cloneBlock = blockCurr->clone();
// Insert our child clone as the first child.
cloneBlock->addChildIgnoringContinuation(cloneChild, 0);
// Hook the clone up as a continuation of |curr|. Note we do encounter
// anonymous blocks possibly as we walk up the block chain. When we split an
// anonymous block, there's no need to do any continuation hookup, since we haven't
// actually split a real element.
if (!blockCurr->isAnonymousBlock()) {
oldCont = blockCurr->continuation();
blockCurr->setContinuation(cloneBlock);
cloneBlock->setContinuation(oldCont);
}
// Now we need to take all of the children starting from the first child
// *after* currChild and append them all to the clone.
blockCurr->moveChildrenTo(cloneBlock, currChildNextSibling, 0, true);
// Keep walking up the chain.
currChild = curr;
currChildNextSibling = currChild->nextSibling();
curr = toRenderBoxModelObject(curr->parent());
}
// Now we are at the columns block level. We need to put the clone into the toBlock.
toBlock->children()->appendChildNode(toBlock, cloneBlock);
// Now take all the children after currChild and remove them from the fromBlock
// and put them in the toBlock.
fromBlock->moveChildrenTo(toBlock, currChildNextSibling, 0, true);
}
void RenderBlock::splitFlow(RenderObject* beforeChild, RenderBlock* newBlockBox,
RenderObject* newChild, RenderBoxModelObject* oldCont)
{
RenderBlock* pre = 0;
RenderBlock* block = containingColumnsBlock();
// Delete our line boxes before we do the inline split into continuations.
block->deleteLineBoxTree();
bool madeNewBeforeBlock = false;
if (block->isAnonymousColumnsBlock()) {
// We can reuse this block and make it the preBlock of the next continuation.
pre = block;
pre->removePositionedObjects(0);
pre->removeFloatingObjects();
block = toRenderBlock(block->parent());
} else {
// No anonymous block available for use. Make one.
pre = block->createAnonymousColumnsBlock();
pre->setChildrenInline(false);
madeNewBeforeBlock = true;
}
RenderBlock* post = block->createAnonymousColumnsBlock();
post->setChildrenInline(false);
RenderObject* boxFirst = madeNewBeforeBlock ? block->firstChild() : pre->nextSibling();
if (madeNewBeforeBlock)
block->children()->insertChildNode(block, pre, boxFirst);
block->children()->insertChildNode(block, newBlockBox, boxFirst);
block->children()->insertChildNode(block, post, boxFirst);
block->setChildrenInline(false);
if (madeNewBeforeBlock)
block->moveChildrenTo(pre, boxFirst, 0, true);
splitBlocks(pre, post, newBlockBox, beforeChild, oldCont);
// We already know the newBlockBox isn't going to contain inline kids, so avoid wasting
// time in makeChildrenNonInline by just setting this explicitly up front.
newBlockBox->setChildrenInline(false);
// We delayed adding the newChild until now so that the |newBlockBox| would be fully
// connected, thus allowing newChild access to a renderArena should it need
// to wrap itself in additional boxes (e.g., table construction).
newBlockBox->addChild(newChild);
// Always just do a full layout in order to ensure that line boxes (especially wrappers for images)
// get deleted properly. Because objects moves from the pre block into the post block, we want to
// make new line boxes instead of leaving the old line boxes around.
pre->setNeedsLayoutAndPrefWidthsRecalc();
block->setNeedsLayoutAndPrefWidthsRecalc();
post->setNeedsLayoutAndPrefWidthsRecalc();
}
void RenderBlock::makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlock* newBlockBox, RenderObject* newChild)
{
RenderBlock* pre = 0;
RenderBlock* post = 0;
RenderBlock* block = this; // Eventually block will not just be |this|, but will also be a block nested inside |this|. Assign to a variable
// so that we don't have to patch all of the rest of the code later on.
// Delete the block's line boxes before we do the split.
block->deleteLineBoxTree();
if (beforeChild && beforeChild->parent() != this)
beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
if (beforeChild != firstChild()) {
pre = block->createAnonymousColumnsBlock();
pre->setChildrenInline(block->childrenInline());
}
if (beforeChild) {
post = block->createAnonymousColumnsBlock();
post->setChildrenInline(block->childrenInline());
}
RenderObject* boxFirst = block->firstChild();
if (pre)
block->children()->insertChildNode(block, pre, boxFirst);
block->children()->insertChildNode(block, newBlockBox, boxFirst);
if (post)
block->children()->insertChildNode(block, post, boxFirst);
block->setChildrenInline(false);
// The pre/post blocks always have layers, so we know to always do a full insert/remove (so we pass true as the last argument).
block->moveChildrenTo(pre, boxFirst, beforeChild, true);
block->moveChildrenTo(post, beforeChild, 0, true);
// We already know the newBlockBox isn't going to contain inline kids, so avoid wasting
// time in makeChildrenNonInline by just setting this explicitly up front.
newBlockBox->setChildrenInline(false);
// We delayed adding the newChild until now so that the |newBlockBox| would be fully
// connected, thus allowing newChild access to a renderArena should it need
// to wrap itself in additional boxes (e.g., table construction).
newBlockBox->addChild(newChild);
// Always just do a full layout in order to ensure that line boxes (especially wrappers for images)
// get deleted properly. Because objects moved from the pre block into the post block, we want to
// make new line boxes instead of leaving the old line boxes around.
if (pre)
pre->setNeedsLayoutAndPrefWidthsRecalc();
block->setNeedsLayoutAndPrefWidthsRecalc();
if (post)
post->setNeedsLayoutAndPrefWidthsRecalc();
}
RenderBlock* RenderBlock::columnsBlockForSpanningElement(RenderObject* newChild)
{
// FIXME: This function is the gateway for the addition of column-span support. It will
// be added to in three stages:
// (1) Immediate children of a multi-column block can span.
// (2) Nested block-level children with only block-level ancestors between them and the multi-column block can span.
// (3) Nested children with block or inline ancestors between them and the multi-column block can span (this is when we
// cross the streams and have to cope with both types of continuations mixed together).
// This function currently supports (1) and (2).
RenderBlock* columnsBlockAncestor = 0;
if (!newChild->isText() && newChild->style()->columnSpan() && !newChild->isBeforeOrAfterContent()
&& !newChild->isFloatingOrOutOfFlowPositioned() && !newChild->isInline() && !isAnonymousColumnSpanBlock()) {
columnsBlockAncestor = containingColumnsBlock(false);
if (columnsBlockAncestor) {
// Make sure that none of the parent ancestors have a continuation.
// If yes, we do not want split the block into continuations.
RenderObject* curr = this;
while (curr && curr != columnsBlockAncestor) {
if (curr->isRenderBlock() && toRenderBlock(curr)->continuation()) {
columnsBlockAncestor = 0;
break;
}
curr = curr->parent();
}
}
}
return columnsBlockAncestor;
}
void RenderBlock::addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild)
{
if (beforeChild && beforeChild->parent() != this) {
RenderObject* beforeChildContainer = beforeChild->parent();
while (beforeChildContainer->parent() != this)
beforeChildContainer = beforeChildContainer->parent();
ASSERT(beforeChildContainer);
if (beforeChildContainer->isAnonymous()) {
// If the requested beforeChild is not one of our children, then this is because
// there is an anonymous container within this object that contains the beforeChild.
RenderObject* beforeChildAnonymousContainer = beforeChildContainer;
if (beforeChildAnonymousContainer->isAnonymousBlock()
#if ENABLE(FULLSCREEN_API)
// Full screen renderers and full screen placeholders act as anonymous blocks, not tables:
|| beforeChildAnonymousContainer->isRenderFullScreen()
|| beforeChildAnonymousContainer->isRenderFullScreenPlaceholder()
#endif
) {
// Insert the child into the anonymous block box instead of here.
if (newChild->isInline() || beforeChild->parent()->firstChild() != beforeChild)
beforeChild->parent()->addChild(newChild, beforeChild);
else
addChild(newChild, beforeChild->parent());
return;
}
ASSERT(beforeChildAnonymousContainer->isTable());
if (newChild->isTablePart()) {
// Insert into the anonymous table.
beforeChildAnonymousContainer->addChild(newChild, beforeChild);
return;
}
beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
ASSERT(beforeChild->parent() == this);
if (beforeChild->parent() != this) {
// We should never reach here. If we do, we need to use the
// safe fallback to use the topmost beforeChild container.
beforeChild = beforeChildContainer;
}
} else {
// We will reach here when beforeChild is a run-in element.
// If run-in element precedes a block-level element, it becomes the
// the first inline child of that block level element. The insertion
// point will be before that block-level element.
ASSERT(beforeChild->isRunIn());
beforeChild = beforeChildContainer;
}
}
// Nothing goes before the intruded run-in.
if (beforeChild && beforeChild->isRunIn() && runInIsPlacedIntoSiblingBlock(beforeChild))
beforeChild = beforeChild->nextSibling();
// Check for a spanning element in columns.
if (gColumnFlowSplitEnabled) {
RenderBlock* columnsBlockAncestor = columnsBlockForSpanningElement(newChild);
if (columnsBlockAncestor) {
TemporaryChange<bool> columnFlowSplitEnabled(gColumnFlowSplitEnabled, false);
// We are placing a column-span element inside a block.
RenderBlock* newBox = createAnonymousColumnSpanBlock();
if (columnsBlockAncestor != this && !isRenderFlowThread()) {
// We are nested inside a multi-column element and are being split by the span. We have to break up
// our block into continuations.
RenderBoxModelObject* oldContinuation = continuation();
// When we split an anonymous block, there's no need to do any continuation hookup,
// since we haven't actually split a real element.
if (!isAnonymousBlock())
setContinuation(newBox);
splitFlow(beforeChild, newBox, newChild, oldContinuation);
return;
}
// We have to perform a split of this block's children. This involves creating an anonymous block box to hold
// the column-spanning |newChild|. We take all of the children from before |newChild| and put them into
// one anonymous columns block, and all of the children after |newChild| go into another anonymous block.
makeChildrenAnonymousColumnBlocks(beforeChild, newBox, newChild);
return;
}
}
bool madeBoxesNonInline = false;
// A block has to either have all of its children inline, or all of its children as blocks.
// So, if our children are currently inline and a block child has to be inserted, we move all our
// inline children into anonymous block boxes.
if (childrenInline() && !newChild->isInline() && !newChild->isFloatingOrOutOfFlowPositioned()) {
// This is a block with inline content. Wrap the inline content in anonymous blocks.
makeChildrenNonInline(beforeChild);
madeBoxesNonInline = true;
if (beforeChild && beforeChild->parent() != this) {
beforeChild = beforeChild->parent();
ASSERT(beforeChild->isAnonymousBlock());
ASSERT(beforeChild->parent() == this);
}
} else if (!childrenInline() && (newChild->isFloatingOrOutOfFlowPositioned() || newChild->isInline())) {
// If we're inserting an inline child but all of our children are blocks, then we have to make sure
// it is put into an anomyous block box. We try to use an existing anonymous box if possible, otherwise
// a new one is created and inserted into our list of children in the appropriate position.
RenderObject* afterChild = beforeChild ? beforeChild->previousSibling() : lastChild();
if (afterChild && afterChild->isAnonymousBlock()) {
afterChild->addChild(newChild);
return;
}
if (newChild->isInline()) {
// No suitable existing anonymous box - create a new one.
RenderBlock* newBox = createAnonymousBlock();
RenderBox::addChild(newBox, beforeChild);
newBox->addChild(newChild);
return;
}
}
RenderBox::addChild(newChild, beforeChild);
// Handle placement of run-ins.
placeRunInIfNeeded(newChild);
if (madeBoxesNonInline && parent() && isAnonymousBlock() && parent()->isRenderBlock())
toRenderBlock(parent())->removeLeftoverAnonymousBlock(this);
// this object may be dead here
}
void RenderBlock::addChild(RenderObject* newChild, RenderObject* beforeChild)
{
if (continuation() && !isAnonymousBlock())
addChildToContinuation(newChild, beforeChild);
else
addChildIgnoringContinuation(newChild, beforeChild);
}
void RenderBlock::addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild)
{
if (!isAnonymousBlock() && firstChild() && (firstChild()->isAnonymousColumnsBlock() || firstChild()->isAnonymousColumnSpanBlock()))
addChildToAnonymousColumnBlocks(newChild, beforeChild);
else
addChildIgnoringAnonymousColumnBlocks(newChild, beforeChild);
}
static void getInlineRun(RenderObject* start, RenderObject* boundary,
RenderObject*& inlineRunStart,
RenderObject*& inlineRunEnd)
{
// Beginning at |start| we find the largest contiguous run of inlines that
// we can. We denote the run with start and end points, |inlineRunStart|
// and |inlineRunEnd|. Note that these two values may be the same if
// we encounter only one inline.
//
// We skip any non-inlines we encounter as long as we haven't found any
// inlines yet.
//
// |boundary| indicates a non-inclusive boundary point. Regardless of whether |boundary|
// is inline or not, we will not include it in a run with inlines before it. It's as though we encountered
// a non-inline.
// Start by skipping as many non-inlines as we can.
RenderObject * curr = start;
bool sawInline;
do {
while (curr && !(curr->isInline() || curr->isFloatingOrOutOfFlowPositioned()))
curr = curr->nextSibling();
inlineRunStart = inlineRunEnd = curr;
if (!curr)
return; // No more inline children to be found.
sawInline = curr->isInline();
curr = curr->nextSibling();
while (curr && (curr->isInline() || curr->isFloatingOrOutOfFlowPositioned()) && (curr != boundary)) {
inlineRunEnd = curr;
if (curr->isInline())
sawInline = true;
curr = curr->nextSibling();
}
} while (!sawInline);
}
void RenderBlock::deleteLineBoxTree()
{
if (containsFloats()) {
// Clear references to originating lines, since the lines are being deleted
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
ASSERT(!((*it)->m_originatingLine) || (*it)->m_originatingLine->renderer() == this);
(*it)->m_originatingLine = 0;
}
}
m_lineBoxes.deleteLineBoxTree(renderArena());
if (AXObjectCache* cache = document()->existingAXObjectCache())
cache->recomputeIsIgnored(this);
}
RootInlineBox* RenderBlock::createRootInlineBox()
{
return new (renderArena()) RootInlineBox(this);
}
RootInlineBox* RenderBlock::createAndAppendRootInlineBox()
{
RootInlineBox* rootBox = createRootInlineBox();
m_lineBoxes.appendLineBox(rootBox);
if (UNLIKELY(AXObjectCache::accessibilityEnabled()) && m_lineBoxes.firstLineBox() == rootBox) {
if (AXObjectCache* cache = document()->existingAXObjectCache())
cache->recomputeIsIgnored(this);
}
return rootBox;
}
void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint)
{
// makeChildrenNonInline takes a block whose children are *all* inline and it
// makes sure that inline children are coalesced under anonymous
// blocks. If |insertionPoint| is defined, then it represents the insertion point for
// the new block child that is causing us to have to wrap all the inlines. This
// means that we cannot coalesce inlines before |insertionPoint| with inlines following
// |insertionPoint|, because the new child is going to be inserted in between the inlines,
// splitting them.
ASSERT(isInlineBlockOrInlineTable() || !isInline());
ASSERT(!insertionPoint || insertionPoint->parent() == this);
setChildrenInline(false);
RenderObject *child = firstChild();
if (!child)
return;
deleteLineBoxTree();
// Since we are going to have block children, we have to move
// back the run-in to its original place.
if (child->isRunIn()) {
moveRunInToOriginalPosition(child);
child = firstChild();
}
while (child) {
RenderObject *inlineRunStart, *inlineRunEnd;
getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd);
if (!inlineRunStart)
break;
child = inlineRunEnd->nextSibling();
RenderBlock* block = createAnonymousBlock();
children()->insertChildNode(this, block, inlineRunStart);
moveChildrenTo(block, inlineRunStart, child);
}
#ifndef NDEBUG
for (RenderObject *c = firstChild(); c; c = c->nextSibling())
ASSERT(!c->isInline());
#endif
repaint();
}
void RenderBlock::removeLeftoverAnonymousBlock(RenderBlock* child)
{
ASSERT(child->isAnonymousBlock());
ASSERT(!child->childrenInline());
if (child->continuation() || (child->firstChild() && (child->isAnonymousColumnSpanBlock() || child->isAnonymousColumnsBlock())))
return;
RenderObject* firstAnChild = child->m_children.firstChild();
RenderObject* lastAnChild = child->m_children.lastChild();
if (firstAnChild) {
RenderObject* o = firstAnChild;
while (o) {
o->setParent(this);
o = o->nextSibling();
}
firstAnChild->setPreviousSibling(child->previousSibling());
lastAnChild->setNextSibling(child->nextSibling());
if (child->previousSibling())
child->previousSibling()->setNextSibling(firstAnChild);
if (child->nextSibling())
child->nextSibling()->setPreviousSibling(lastAnChild);
if (child == m_children.firstChild())
m_children.setFirstChild(firstAnChild);
if (child == m_children.lastChild())
m_children.setLastChild(lastAnChild);
} else {
if (child == m_children.firstChild())
m_children.setFirstChild(child->nextSibling());
if (child == m_children.lastChild())
m_children.setLastChild(child->previousSibling());
if (child->previousSibling())
child->previousSibling()->setNextSibling(child->nextSibling());
if (child->nextSibling())
child->nextSibling()->setPreviousSibling(child->previousSibling());
}
child->children()->setFirstChild(0);
child->m_next = 0;
// Remove all the information in the flow thread associated with the leftover anonymous block.
child->removeFromRenderFlowThread();
child->setParent(0);
child->setPreviousSibling(0);
child->setNextSibling(0);
child->destroy();
}
static bool canMergeContiguousAnonymousBlocks(RenderObject* oldChild, RenderObject* prev, RenderObject* next)
{
if (oldChild->documentBeingDestroyed() || oldChild->isInline() || oldChild->virtualContinuation())
return false;
if ((prev && (!prev->isAnonymousBlock() || toRenderBlock(prev)->continuation() || toRenderBlock(prev)->beingDestroyed()))
|| (next && (!next->isAnonymousBlock() || toRenderBlock(next)->continuation() || toRenderBlock(next)->beingDestroyed())))
return false;
// FIXME: This check isn't required when inline run-ins can't be split into continuations.
if (prev && prev->firstChild() && prev->firstChild()->isInline() && prev->firstChild()->isRunIn())
return false;
if ((prev && (prev->isRubyRun() || prev->isRubyBase()))
|| (next && (next->isRubyRun() || next->isRubyBase())))
return false;
if (!prev || !next)
return true;
// Make sure the types of the anonymous blocks match up.
return prev->isAnonymousColumnsBlock() == next->isAnonymousColumnsBlock()
&& prev->isAnonymousColumnSpanBlock() == next->isAnonymousColumnSpanBlock();
}
void RenderBlock::collapseAnonymousBoxChild(RenderBlock* parent, RenderObject* child)
{
parent->setNeedsLayoutAndPrefWidthsRecalc();
parent->setChildrenInline(child->childrenInline());
RenderObject* nextSibling = child->nextSibling();
RenderFlowThread* childFlowThread = child->flowThreadContainingBlock();
CurrentRenderFlowThreadMaintainer flowThreadMaintainer(childFlowThread);
RenderBlock* anonBlock = toRenderBlock(parent->children()->removeChildNode(parent, child, child->hasLayer()));
anonBlock->moveAllChildrenTo(parent, nextSibling, child->hasLayer());
// Delete the now-empty block's lines and nuke it.
anonBlock->deleteLineBoxTree();
if (childFlowThread && childFlowThread->isRenderNamedFlowThread())
toRenderNamedFlowThread(childFlowThread)->removeFlowChildInfo(anonBlock);
anonBlock->destroy();
}
void RenderBlock::moveAllChildrenIncludingFloatsTo(RenderBlock* toBlock, bool fullRemoveInsert)
{
moveAllChildrenTo(toBlock, fullRemoveInsert);
// When a portion of the render tree is being detached, anonymous blocks
// will be combined as their children are deleted. In this process, the
// anonymous block later in the tree is merged into the one preceeding it.
// It can happen that the later block (this) contains floats that the
// previous block (toBlock) did not contain, and thus are not in the
// floating objects list for toBlock. This can result in toBlock containing
// floats that are not in it's floating objects list, but are in the
// floating objects lists of siblings and parents. This can cause problems
// when the float itself is deleted, since the deletion code assumes that
// if a float is not in it's containing block's floating objects list, it
// isn't in any floating objects list. In order to preserve this condition
// (removing it has serious performance implications), we need to copy the
// floating objects from the old block (this) to the new block (toBlock).
// The float's metrics will likely all be wrong, but since toBlock is
// already marked for layout, this will get fixed before anything gets
// displayed.
// See bug https://bugs.webkit.org/show_bug.cgi?id=115566
if (m_floatingObjects) {
if (!toBlock->m_floatingObjects)
toBlock->createFloatingObjects();
const FloatingObjectSet& fromFloatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = fromFloatingObjectSet.end();
for (FloatingObjectSetIterator it = fromFloatingObjectSet.begin(); it != end; ++it) {
FloatingObject* floatingObject = *it;
// Don't insert the object again if it's already in the list
if (toBlock->containsFloat(floatingObject->renderer()))
continue;
toBlock->m_floatingObjects->add(floatingObject->clone());
}
}
}
void RenderBlock::removeChild(RenderObject* oldChild)
{
// No need to waste time in merging or removing empty anonymous blocks.
// We can just bail out if our document is getting destroyed.
if (documentBeingDestroyed()) {
RenderBox::removeChild(oldChild);
return;
}
// This protects against column split flows when anonymous blocks are getting merged.
TemporaryChange<bool> columnFlowSplitEnabled(gColumnFlowSplitEnabled, false);
// If this child is a block, and if our previous and next siblings are
// both anonymous blocks with inline content, then we can go ahead and
// fold the inline content back together.
RenderObject* prev = oldChild->previousSibling();
RenderObject* next = oldChild->nextSibling();
bool canMergeAnonymousBlocks = canMergeContiguousAnonymousBlocks(oldChild, prev, next);
if (canMergeAnonymousBlocks && prev && next) {
prev->setNeedsLayoutAndPrefWidthsRecalc();
RenderBlock* nextBlock = toRenderBlock(next);
RenderBlock* prevBlock = toRenderBlock(prev);
if (prev->childrenInline() != next->childrenInline()) {
RenderBlock* inlineChildrenBlock = prev->childrenInline() ? prevBlock : nextBlock;
RenderBlock* blockChildrenBlock = prev->childrenInline() ? nextBlock : prevBlock;
// Place the inline children block inside of the block children block instead of deleting it.
// In order to reuse it, we have to reset it to just be a generic anonymous block. Make sure
// to clear out inherited column properties by just making a new style, and to also clear the
// column span flag if it is set.
ASSERT(!inlineChildrenBlock->continuation());
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK);
// Cache this value as it might get changed in setStyle() call.
bool inlineChildrenBlockHasLayer = inlineChildrenBlock->hasLayer();
inlineChildrenBlock->setStyle(newStyle);
children()->removeChildNode(this, inlineChildrenBlock, inlineChildrenBlockHasLayer);
// Now just put the inlineChildrenBlock inside the blockChildrenBlock.
blockChildrenBlock->children()->insertChildNode(blockChildrenBlock, inlineChildrenBlock, prev == inlineChildrenBlock ? blockChildrenBlock->firstChild() : 0,
inlineChildrenBlockHasLayer || blockChildrenBlock->hasLayer());
next->setNeedsLayoutAndPrefWidthsRecalc();
// inlineChildrenBlock got reparented to blockChildrenBlock, so it is no longer a child
// of "this". we null out prev or next so that is not used later in the function.
if (inlineChildrenBlock == prevBlock)
prev = 0;
else
next = 0;
} else {
// Take all the children out of the |next| block and put them in
// the |prev| block.
nextBlock->moveAllChildrenIncludingFloatsTo(prevBlock, nextBlock->hasLayer() || prevBlock->hasLayer());
// Delete the now-empty block's lines and nuke it.
nextBlock->deleteLineBoxTree();
nextBlock->destroy();
next = 0;
}
}
RenderBox::removeChild(oldChild);
RenderObject* child = prev ? prev : next;
if (canMergeAnonymousBlocks && child && !child->previousSibling() && !child->nextSibling() && canCollapseAnonymousBlockChild()) {
// The removal has knocked us down to containing only a single anonymous
// box. We can go ahead and pull the content right back up into our
// box.
collapseAnonymousBoxChild(this, child);
} else if (((prev && prev->isAnonymousBlock()) || (next && next->isAnonymousBlock())) && canCollapseAnonymousBlockChild()) {
// It's possible that the removal has knocked us down to a single anonymous
// block with pseudo-style element siblings (e.g. first-letter). If these
// are floating, then we need to pull the content up also.
RenderBlock* anonBlock = toRenderBlock((prev && prev->isAnonymousBlock()) ? prev : next);
if ((anonBlock->previousSibling() || anonBlock->nextSibling())
&& (!anonBlock->previousSibling() || (anonBlock->previousSibling()->style()->styleType() != NOPSEUDO && anonBlock->previousSibling()->isFloating() && !anonBlock->previousSibling()->previousSibling()))
&& (!anonBlock->nextSibling() || (anonBlock->nextSibling()->style()->styleType() != NOPSEUDO && anonBlock->nextSibling()->isFloating() && !anonBlock->nextSibling()->nextSibling()))) {
collapseAnonymousBoxChild(this, anonBlock);
}
}
if (!firstChild()) {
// If this was our last child be sure to clear out our line boxes.
if (childrenInline())
deleteLineBoxTree();
// If we are an empty anonymous block in the continuation chain,
// we need to remove ourself and fix the continuation chain.
if (!beingDestroyed() && isAnonymousBlockContinuation() && !oldChild->isListMarker()) {
RenderObject* containingBlockIgnoringAnonymous = containingBlock();
while (containingBlockIgnoringAnonymous && containingBlockIgnoringAnonymous->isAnonymousBlock())
containingBlockIgnoringAnonymous = containingBlockIgnoringAnonymous->containingBlock();
for (RenderObject* curr = this; curr; curr = curr->previousInPreOrder(containingBlockIgnoringAnonymous)) {
if (curr->virtualContinuation() != this)
continue;
// Found our previous continuation. We just need to point it to
// |this|'s next continuation.
RenderBoxModelObject* nextContinuation = continuation();
if (curr->isRenderInline())
toRenderInline(curr)->setContinuation(nextContinuation);
else if (curr->isRenderBlock())
toRenderBlock(curr)->setContinuation(nextContinuation);
else
ASSERT_NOT_REACHED();
break;
}
setContinuation(0);
destroy();
}
}
}
bool RenderBlock::isSelfCollapsingBlock() const
{
// We are not self-collapsing if we
// (a) have a non-zero height according to layout (an optimization to avoid wasting time)
// (b) are a table,
// (c) have border/padding,
// (d) have a min-height
// (e) have specified that one of our margins can't collapse using a CSS extension
if (logicalHeight() > 0
|| isTable() || borderAndPaddingLogicalHeight()
|| style()->logicalMinHeight().isPositive()
|| style()->marginBeforeCollapse() == MSEPARATE || style()->marginAfterCollapse() == MSEPARATE)
return false;
Length logicalHeightLength = style()->logicalHeight();
bool hasAutoHeight = logicalHeightLength.isAuto();
if (logicalHeightLength.isPercent() && !document()->inQuirksMode()) {
hasAutoHeight = true;
for (RenderBlock* cb = containingBlock(); !cb->isRenderView(); cb = cb->containingBlock()) {
if (cb->style()->logicalHeight().isFixed() || cb->isTableCell())
hasAutoHeight = false;
}
}
// If the height is 0 or auto, then whether or not we are a self-collapsing block depends
// on whether we have content that is all self-collapsing or not.
if (hasAutoHeight || ((logicalHeightLength.isFixed() || logicalHeightLength.isPercent()) && logicalHeightLength.isZero())) {
// If the block has inline children, see if we generated any line boxes. If we have any
// line boxes, then we can't be self-collapsing, since we have content.
if (childrenInline())
return !firstLineBox();
// Whether or not we collapse is dependent on whether all our normal flow children
// are also self-collapsing.
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (child->isFloatingOrOutOfFlowPositioned())
continue;
if (!child->isSelfCollapsingBlock())
return false;
}
return true;
}
return false;
}
void RenderBlock::startDelayUpdateScrollInfo()
{
if (gDelayUpdateScrollInfo == 0) {
ASSERT(!gDelayedUpdateScrollInfoSet);
gDelayedUpdateScrollInfoSet = new DelayedUpdateScrollInfoSet;
}
ASSERT(gDelayedUpdateScrollInfoSet);
++gDelayUpdateScrollInfo;
}
void RenderBlock::finishDelayUpdateScrollInfo()
{
--gDelayUpdateScrollInfo;
ASSERT(gDelayUpdateScrollInfo >= 0);
if (gDelayUpdateScrollInfo == 0) {
ASSERT(gDelayedUpdateScrollInfoSet);
OwnPtr<DelayedUpdateScrollInfoSet> infoSet(adoptPtr(gDelayedUpdateScrollInfoSet));
gDelayedUpdateScrollInfoSet = 0;
for (DelayedUpdateScrollInfoSet::iterator it = infoSet->begin(); it != infoSet->end(); ++it) {
RenderBlock* block = *it;
if (block->hasOverflowClip()) {
block->layer()->updateScrollInfoAfterLayout();
block->clearLayoutOverflow();
}
}
}
}
void RenderBlock::updateScrollInfoAfterLayout()
{
if (hasOverflowClip()) {
if (style()->isFlippedBlocksWritingMode()) {
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=97937
// Workaround for now. We cannot delay the scroll info for overflow
// for items with opposite writing directions, as the contents needs
// to overflow in that direction
layer()->updateScrollInfoAfterLayout();
return;
}
if (gDelayUpdateScrollInfo)
gDelayedUpdateScrollInfoSet->add(this);
else
layer()->updateScrollInfoAfterLayout();
}
}
void RenderBlock::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
OverflowEventDispatcher dispatcher(this);
// Update our first letter info now.
updateFirstLetter();
// Table cells call layoutBlock directly, so don't add any logic here. Put code into
// layoutBlock().
layoutBlock(false);
// It's safe to check for control clip here, since controls can never be table cells.
// If we have a lightweight clip, there can never be any overflow from children.
if (hasControlClip() && m_overflow && !gDelayUpdateScrollInfo)
clearLayoutOverflow();
invalidateBackgroundObscurationStatus();
}
#if ENABLE(CSS_SHAPES)
void RenderBlock::updateExclusionShapeInsideInfoAfterStyleChange(const ExclusionShapeValue* shapeInside, const ExclusionShapeValue* oldShapeInside)
{
// FIXME: A future optimization would do a deep comparison for equality.
if (shapeInside == oldShapeInside)
return;
if (shapeInside) {
ExclusionShapeInsideInfo* exclusionShapeInsideInfo = ensureExclusionShapeInsideInfo();
exclusionShapeInsideInfo->dirtyShapeSize();
} else {
setExclusionShapeInsideInfo(nullptr);
markShapeInsideDescendantsForLayout();
}
}
void RenderBlock::markShapeInsideDescendantsForLayout()
{
if (!everHadLayout())
return;
if (childrenInline()) {
setNeedsLayout(true);
return;
}
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!child->isRenderBlock())
continue;
RenderBlock* childBlock = toRenderBlock(child);
childBlock->markShapeInsideDescendantsForLayout();
}
}
#endif
static inline bool exclusionInfoRequiresRelayout(const RenderBlock* block)
{
#if !ENABLE(CSS_SHAPES)
return false;
#else
ExclusionShapeInsideInfo* info = block->exclusionShapeInsideInfo();
if (info)
info->setNeedsLayout(info->shapeSizeDirty());
else
info = block->layoutExclusionShapeInsideInfo();
return info && info->needsLayout();
#endif
}
bool RenderBlock::updateRegionsAndExclusionsBeforeChildLayout(RenderFlowThread* flowThread)
{
#if ENABLE(CSS_SHAPES)
if (!flowThread && !exclusionShapeInsideInfo())
#else
if (!flowThread)
#endif
return exclusionInfoRequiresRelayout(this);
LayoutUnit oldHeight = logicalHeight();
LayoutUnit oldTop = logicalTop();
// Compute the maximum logical height content may cause this block to expand to
// FIXME: These should eventually use the const computeLogicalHeight rather than updateLogicalHeight
setLogicalHeight(LayoutUnit::max() / 2);
updateLogicalHeight();
#if ENABLE(CSS_SHAPES)
computeExclusionShapeSize();
#endif
// Set our start and end regions. No regions above or below us will be considered by our children. They are
// effectively clamped to our region range.
computeRegionRangeForBlock(flowThread);
setLogicalHeight(oldHeight);
setLogicalTop(oldTop);
return exclusionInfoRequiresRelayout(this);
}
#if ENABLE(CSS_SHAPES)
void RenderBlock::computeExclusionShapeSize()
{
ExclusionShapeInsideInfo* exclusionShapeInsideInfo = this->exclusionShapeInsideInfo();
if (exclusionShapeInsideInfo) {
bool percentageLogicalHeightResolvable = percentageLogicalHeightIsResolvableFromBlock(this, false);
exclusionShapeInsideInfo->setShapeSize(logicalWidth(), percentageLogicalHeightResolvable ? logicalHeight() : LayoutUnit());
}
}
#endif
void RenderBlock::updateRegionsAndExclusionsAfterChildLayout(RenderFlowThread* flowThread, bool heightChanged)
{
#if ENABLE(CSS_SHAPES)
// A previous sibling has changed dimension, so we need to relayout the shape with the content
ExclusionShapeInsideInfo* shapeInsideInfo = layoutExclusionShapeInsideInfo();
if (heightChanged && shapeInsideInfo)
shapeInsideInfo->dirtyShapeSize();
#endif
computeRegionRangeForBlock(flowThread);
}
void RenderBlock::computeRegionRangeForBlock(RenderFlowThread* flowThread)
{
if (flowThread)
flowThread->setRegionRangeForBox(this, offsetFromLogicalTopOfFirstPage());
}
bool RenderBlock::updateLogicalWidthAndColumnWidth()
{
LayoutUnit oldWidth = logicalWidth();
LayoutUnit oldColumnWidth = desiredColumnWidth();
updateLogicalWidth();
calcColumnWidth();
bool hasBorderOrPaddingLogicalWidthChanged = m_hasBorderOrPaddingLogicalWidthChanged;
m_hasBorderOrPaddingLogicalWidthChanged = false;
return oldWidth != logicalWidth() || oldColumnWidth != desiredColumnWidth() || hasBorderOrPaddingLogicalWidthChanged;
}
void RenderBlock::checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight)
{
ColumnInfo* colInfo = columnInfo();
if (hasColumns()) {
if (!pageLogicalHeight) {
// We need to go ahead and set our explicit page height if one exists, so that we can
// avoid doing two layout passes.
updateLogicalHeight();
LayoutUnit columnHeight = contentLogicalHeight();
if (columnHeight > 0) {
pageLogicalHeight = columnHeight;
hasSpecifiedPageLogicalHeight = true;
}
setLogicalHeight(0);
}
if (colInfo->columnHeight() != pageLogicalHeight && everHadLayout())
pageLogicalHeightChanged = true;
colInfo->setColumnHeight(pageLogicalHeight);
if (!hasSpecifiedPageLogicalHeight && !pageLogicalHeight)
colInfo->clearForcedBreaks();
colInfo->setPaginationUnit(paginationUnit());
} else if (isRenderFlowThread()) {
pageLogicalHeight = 1; // This is just a hack to always make sure we have a page logical height.
pageLogicalHeightChanged = toRenderFlowThread(this)->pageLogicalSizeChanged();
}
}
void RenderBlock::layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight)
{
ASSERT(needsLayout());
if (isInline() && !isInlineBlockOrInlineTable()) // Inline <form>s inside various table elements can
return; // cause us to come in here. Just bail.
if (!relayoutChildren && simplifiedLayout())
return;
LayoutRepainter repainter(*this, checkForRepaintDuringLayout());
if (updateLogicalWidthAndColumnWidth())
relayoutChildren = true;
clearFloats();
LayoutUnit previousHeight = logicalHeight();
// FIXME: should this start out as borderAndPaddingLogicalHeight() + scrollbarLogicalHeight(),
// for consistency with other render classes?
setLogicalHeight(0);
bool pageLogicalHeightChanged = false;
bool hasSpecifiedPageLogicalHeight = false;
checkForPaginationLogicalHeightChange(pageLogicalHeight, pageLogicalHeightChanged, hasSpecifiedPageLogicalHeight);
RenderView* renderView = view();
RenderStyle* styleToUse = style();
LayoutStateMaintainer statePusher(renderView, this, locationOffset(), hasColumns() || hasTransform() || hasReflection() || styleToUse->isFlippedBlocksWritingMode(), pageLogicalHeight, pageLogicalHeightChanged, columnInfo());
// Regions changing widths can force us to relayout our children.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (logicalWidthChangedInRegions(flowThread))
relayoutChildren = true;
if (updateRegionsAndExclusionsBeforeChildLayout(flowThread))
relayoutChildren = true;
// We use four values, maxTopPos, maxTopNeg, maxBottomPos, and maxBottomNeg, to track
// our current maximal positive and negative margins. These values are used when we
// are collapsed with adjacent blocks, so for example, if you have block A and B
// collapsing together, then you'd take the maximal positive margin from both A and B
// and subtract it from the maximal negative margin from both A and B to get the
// true collapsed margin. This algorithm is recursive, so when we finish layout()
// our block knows its current maximal positive/negative values.
//
// Start out by setting our margin values to our current margins. Table cells have
// no margins, so we don't fill in the values for table cells.
bool isCell = isTableCell();
if (!isCell) {
initMaxMarginValues();
setHasMarginBeforeQuirk(styleToUse->hasMarginBeforeQuirk());
setHasMarginAfterQuirk(styleToUse->hasMarginAfterQuirk());
setPaginationStrut(0);
}
LayoutUnit repaintLogicalTop = 0;
LayoutUnit repaintLogicalBottom = 0;
LayoutUnit maxFloatLogicalBottom = 0;
if (!firstChild() && !isAnonymousBlock())
setChildrenInline(true);
if (childrenInline())
layoutInlineChildren(relayoutChildren, repaintLogicalTop, repaintLogicalBottom);
else
layoutBlockChildren(relayoutChildren, maxFloatLogicalBottom);
// Expand our intrinsic height to encompass floats.
LayoutUnit toAdd = borderAfter() + paddingAfter() + scrollbarLogicalHeight();
if (lowestFloatLogicalBottom() > (logicalHeight() - toAdd) && expandsToEncloseOverhangingFloats())
setLogicalHeight(lowestFloatLogicalBottom() + toAdd);
if (relayoutForPagination(hasSpecifiedPageLogicalHeight, pageLogicalHeight, statePusher))
return;
// Calculate our new height.
LayoutUnit oldHeight = logicalHeight();
LayoutUnit oldClientAfterEdge = clientLogicalBottom();
// Before updating the final size of the flow thread make sure a forced break is applied after the content.
// This ensures the size information is correctly computed for the last auto-height region receiving content.
if (isRenderFlowThread())
toRenderFlowThread(this)->applyBreakAfterContent(oldClientAfterEdge);
updateLogicalHeight();
LayoutUnit newHeight = logicalHeight();
if (oldHeight != newHeight) {
if (oldHeight > newHeight && maxFloatLogicalBottom > newHeight && !childrenInline()) {
// One of our children's floats may have become an overhanging float for us. We need to look for it.
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (child->isBlockFlow() && !child->isFloatingOrOutOfFlowPositioned()) {
RenderBlock* block = toRenderBlock(child);
if (block->lowestFloatLogicalBottom() + block->logicalTop() > newHeight)
addOverhangingFloats(block, false);
}
}
}
}
bool heightChanged = (previousHeight != newHeight);
if (heightChanged)
relayoutChildren = true;
layoutPositionedObjects(relayoutChildren || isRoot());
updateRegionsAndExclusionsAfterChildLayout(flowThread, heightChanged);
// Add overflow from children (unless we're multi-column, since in that case all our child overflow is clipped anyway).
computeOverflow(oldClientAfterEdge);
statePusher.pop();
fitBorderToLinesIfNeeded();
if (renderView->layoutState()->m_pageLogicalHeight)
setPageLogicalOffset(renderView->layoutState()->pageLogicalOffset(this, logicalTop()));
updateLayerTransform();
// Update our scroll information if we're overflow:auto/scroll/hidden now that we know if
// we overflow or not.
updateScrollInfoAfterLayout();
// FIXME: This repaint logic should be moved into a separate helper function!
// Repaint with our new bounds if they are different from our old bounds.
bool didFullRepaint = repainter.repaintAfterLayout();
if (!didFullRepaint && repaintLogicalTop != repaintLogicalBottom && (styleToUse->visibility() == VISIBLE || enclosingLayer()->hasVisibleContent())) {
// FIXME: We could tighten up the left and right invalidation points if we let layoutInlineChildren fill them in based off the particular lines
// it had to lay out. We wouldn't need the hasOverflowClip() hack in that case either.
LayoutUnit repaintLogicalLeft = logicalLeftVisualOverflow();
LayoutUnit repaintLogicalRight = logicalRightVisualOverflow();
if (hasOverflowClip()) {
// If we have clipped overflow, we should use layout overflow as well, since visual overflow from lines didn't propagate to our block's overflow.
// Note the old code did this as well but even for overflow:visible. The addition of hasOverflowClip() at least tightens up the hack a bit.
// layoutInlineChildren should be patched to compute the entire repaint rect.
repaintLogicalLeft = min(repaintLogicalLeft, logicalLeftLayoutOverflow());
repaintLogicalRight = max(repaintLogicalRight, logicalRightLayoutOverflow());
}
LayoutRect repaintRect;
if (isHorizontalWritingMode())
repaintRect = LayoutRect(repaintLogicalLeft, repaintLogicalTop, repaintLogicalRight - repaintLogicalLeft, repaintLogicalBottom - repaintLogicalTop);
else
repaintRect = LayoutRect(repaintLogicalTop, repaintLogicalLeft, repaintLogicalBottom - repaintLogicalTop, repaintLogicalRight - repaintLogicalLeft);
// The repaint rect may be split across columns, in which case adjustRectForColumns() will return the union.
adjustRectForColumns(repaintRect);
repaintRect.inflate(maximalOutlineSize(PaintPhaseOutline));
if (hasOverflowClip()) {
// Adjust repaint rect for scroll offset
repaintRect.move(-scrolledContentOffset());
// Don't allow this rect to spill out of our overflow box.
repaintRect.intersect(LayoutRect(LayoutPoint(), size()));
}
// Make sure the rect is still non-empty after intersecting for overflow above
if (!repaintRect.isEmpty()) {
repaintRectangle(repaintRect); // We need to do a partial repaint of our content.
if (hasReflection())
repaintRectangle(reflectedRect(repaintRect));
}
}
setNeedsLayout(false);
}
void RenderBlock::addOverflowFromChildren()
{
if (!hasColumns()) {
if (childrenInline())
addOverflowFromInlineChildren();
else
addOverflowFromBlockChildren();
} else {
ColumnInfo* colInfo = columnInfo();
if (columnCount(colInfo)) {
LayoutRect lastRect = columnRectAt(colInfo, columnCount(colInfo) - 1);
addLayoutOverflow(lastRect);
if (!hasOverflowClip())
addVisualOverflow(lastRect);
}
}
}
void RenderBlock::computeOverflow(LayoutUnit oldClientAfterEdge, bool recomputeFloats)
{
m_overflow.clear();
// Add overflow from children.
addOverflowFromChildren();
if (!hasColumns() && (recomputeFloats || isRoot() || expandsToEncloseOverhangingFloats() || hasSelfPaintingLayer()))
addOverflowFromFloats();
// Add in the overflow from positioned objects.
addOverflowFromPositionedObjects();
if (hasOverflowClip()) {
// When we have overflow clip, propagate the original spillout since it will include collapsed bottom margins
// and bottom padding. Set the axis we don't care about to be 1, since we want this overflow to always
// be considered reachable.
LayoutRect clientRect(clientBoxRect());
LayoutRect rectToApply;
if (isHorizontalWritingMode())
rectToApply = LayoutRect(clientRect.x(), clientRect.y(), 1, max<LayoutUnit>(0, oldClientAfterEdge - clientRect.y()));
else
rectToApply = LayoutRect(clientRect.x(), clientRect.y(), max<LayoutUnit>(0, oldClientAfterEdge - clientRect.x()), 1);
addLayoutOverflow(rectToApply);
if (hasRenderOverflow())
m_overflow->setLayoutClientAfterEdge(oldClientAfterEdge);
}
// Allow our overflow to catch cases where the caret in an empty editable element with negative text indent needs to get painted.
LayoutUnit textIndent = textIndentOffset();
if (textIndent < 0) {
LayoutRect clientRect(clientBoxRect());
LayoutRect rectToApply = LayoutRect(clientRect.x() + min<LayoutUnit>(0, textIndent), clientRect.y(), clientRect.width() - min<LayoutUnit>(0, textIndent), clientRect.height());
addVisualOverflow(rectToApply);
}
// Add visual overflow from box-shadow and border-image-outset.
addVisualEffectOverflow();
// Add visual overflow from theme.
addVisualOverflowFromTheme();
if (isRenderFlowThread())
toRenderFlowThread(this)->computeOverflowStateForRegions(oldClientAfterEdge);
}
void RenderBlock::clearLayoutOverflow()
{
if (!m_overflow)
return;
if (visualOverflowRect() == borderBoxRect()) {
m_overflow.clear();
return;
}
m_overflow->setLayoutOverflow(borderBoxRect());
}
void RenderBlock::addOverflowFromBlockChildren()
{
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (!child->isFloatingOrOutOfFlowPositioned())
addOverflowFromChild(child);
}
}
void RenderBlock::addOverflowFromFloats()
{
if (!m_floatingObjects)
return;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
if (r->isDescendant())
addOverflowFromChild(r->m_renderer, IntSize(xPositionForFloatIncludingMargin(r), yPositionForFloatIncludingMargin(r)));
}
}
void RenderBlock::addOverflowFromPositionedObjects()
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
RenderBox* positionedObject;
TrackedRendererListHashSet::iterator end = positionedDescendants->end();
for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
positionedObject = *it;
// Fixed positioned elements don't contribute to layout overflow, since they don't scroll with the content.
if (positionedObject->style()->position() != FixedPosition) {
LayoutUnit x = positionedObject->x();
if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
x -= verticalScrollbarWidth();
addOverflowFromChild(positionedObject, LayoutSize(x, positionedObject->y()));
}
}
}
void RenderBlock::addVisualOverflowFromTheme()
{
if (!style()->hasAppearance())
return;
IntRect inflatedRect = pixelSnappedBorderBoxRect();
theme()->adjustRepaintRect(this, inflatedRect);
addVisualOverflow(inflatedRect);
}
bool RenderBlock::expandsToEncloseOverhangingFloats() const
{
return isInlineBlockOrInlineTable() || isFloatingOrOutOfFlowPositioned() || hasOverflowClip() || (parent() && parent()->isFlexibleBoxIncludingDeprecated())
|| hasColumns() || isTableCell() || isTableCaption() || isFieldset() || isWritingModeRoot() || isRoot();
}
void RenderBlock::adjustPositionedBlock(RenderBox* child, const MarginInfo& marginInfo)
{
bool isHorizontal = isHorizontalWritingMode();
bool hasStaticBlockPosition = child->style()->hasStaticBlockPosition(isHorizontal);
LayoutUnit logicalTop = logicalHeight();
updateStaticInlinePositionForChild(child, logicalTop);
if (!marginInfo.canCollapseWithMarginBefore()) {
// Positioned blocks don't collapse margins, so add the margin provided by
// the container now. The child's own margin is added later when calculating its logical top.
LayoutUnit collapsedBeforePos = marginInfo.positiveMargin();
LayoutUnit collapsedBeforeNeg = marginInfo.negativeMargin();
logicalTop += collapsedBeforePos - collapsedBeforeNeg;
}
RenderLayer* childLayer = child->layer();
if (childLayer->staticBlockPosition() != logicalTop) {
childLayer->setStaticBlockPosition(logicalTop);
if (hasStaticBlockPosition)
child->setChildNeedsLayout(true, MarkOnlyThis);
}
}
void RenderBlock::adjustFloatingBlock(const MarginInfo& marginInfo)
{
// The float should be positioned taking into account the bottom margin
// of the previous flow. We add that margin into the height, get the
// float positioned properly, and then subtract the margin out of the
// height again. In the case of self-collapsing blocks, we always just
// use the top margins, since the self-collapsing block collapsed its
// own bottom margin into its top margin.
//
// Note also that the previous flow may collapse its margin into the top of
// our block. If this is the case, then we do not add the margin in to our
// height when computing the position of the float. This condition can be tested
// for by simply calling canCollapseWithMarginBefore. See
// http://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/046.html for
// an example of this scenario.
LayoutUnit marginOffset = marginInfo.canCollapseWithMarginBefore() ? LayoutUnit() : marginInfo.margin();
setLogicalHeight(logicalHeight() + marginOffset);
positionNewFloats();
setLogicalHeight(logicalHeight() - marginOffset);
}
static void destroyRunIn(RenderBoxModelObject* runIn)
{
ASSERT(runIn->isRunIn());
ASSERT(!runIn->firstChild());
// Delete our line box tree. This is needed as our children got moved
// and our line box tree is no longer valid.
if (runIn->isRenderBlock())
toRenderBlock(runIn)->deleteLineBoxTree();
else if (runIn->isRenderInline())
toRenderInline(runIn)->deleteLineBoxTree();
else
ASSERT_NOT_REACHED();
runIn->destroy();
}
void RenderBlock::placeRunInIfNeeded(RenderObject* newChild)
{
if (newChild->isRunIn())
moveRunInUnderSiblingBlockIfNeeded(newChild);
else if (RenderObject* prevSibling = newChild->previousSibling()) {
if (prevSibling->isRunIn())
moveRunInUnderSiblingBlockIfNeeded(prevSibling);
}
}
RenderBoxModelObject* RenderBlock::createReplacementRunIn(RenderBoxModelObject* runIn)
{
ASSERT(runIn->isRunIn());
ASSERT(runIn->node());
RenderBoxModelObject* newRunIn = 0;
if (!runIn->isRenderBlock())
newRunIn = new (renderArena()) RenderBlock(runIn->node());
else
newRunIn = new (renderArena()) RenderInline(toElement(runIn->node()));
runIn->node()->setRenderer(newRunIn);
newRunIn->setStyle(runIn->style());
runIn->moveAllChildrenTo(newRunIn, true);
return newRunIn;
}
void RenderBlock::moveRunInUnderSiblingBlockIfNeeded(RenderObject* runIn)
{
ASSERT(runIn->isRunIn());
// See if we have inline children. If the children aren't inline,
// then just treat the run-in as a normal block.
if (!runIn->childrenInline())
return;
// FIXME: We don't handle non-block elements with run-in for now.
if (!runIn->isRenderBlock())
return;
// FIXME: We don't support run-ins with or as part of a continuation
// as it makes the back-and-forth placing complex.
if (runIn->isElementContinuation() || runIn->virtualContinuation())
return;
// Check if this node is allowed to run-in. E.g. <select> expects its renderer to
// be a RenderListBox or RenderMenuList, and hence cannot be a RenderInline run-in.
if (!runIn->canBeReplacedWithInlineRunIn())
return;
RenderObject* curr = runIn->nextSibling();
if (!curr || !curr->isRenderBlock() || !curr->childrenInline())
return;
if (toRenderBlock(curr)->beingDestroyed())
return;
// Per CSS3, "A run-in cannot run in to a block that already starts with a
// run-in or that itself is a run-in".
if (curr->isRunIn() || (curr->firstChild() && curr->firstChild()->isRunIn()))
return;
if (curr->isAnonymous() || curr->isFloatingOrOutOfFlowPositioned())
return;
RenderBoxModelObject* oldRunIn = toRenderBoxModelObject(runIn);
RenderBoxModelObject* newRunIn = createReplacementRunIn(oldRunIn);
destroyRunIn(oldRunIn);
// Now insert the new child under |curr| block. Use addChild instead of insertChildNode
// since it handles correct placement of the children, especially where we cannot insert
// anything before the first child. e.g. details tag. See https://bugs.webkit.org/show_bug.cgi?id=58228.
curr->addChild(newRunIn, curr->firstChild());
// Make sure that |this| get a layout since its run-in child moved.
curr->setNeedsLayoutAndPrefWidthsRecalc();
}
bool RenderBlock::runInIsPlacedIntoSiblingBlock(RenderObject* runIn)
{
ASSERT(runIn->isRunIn());
// If we don't have a parent, we can't be moved into our sibling block.
if (!parent())
return false;
// An intruded run-in needs to be an inline.
if (!runIn->isRenderInline())
return false;
return true;
}
void RenderBlock::moveRunInToOriginalPosition(RenderObject* runIn)
{
ASSERT(runIn->isRunIn());
if (!runInIsPlacedIntoSiblingBlock(runIn))
return;
// FIXME: Run-in that are now placed in sibling block can break up into continuation
// chains when new children are added to it. We cannot easily send them back to their
// original place since that requires writing integration logic with RenderInline::addChild
// and all other places that might cause continuations to be created (without blowing away
// |this|). Disabling this feature for now to prevent crashes.
if (runIn->isElementContinuation() || runIn->virtualContinuation())
return;
RenderBoxModelObject* oldRunIn = toRenderBoxModelObject(runIn);
RenderBoxModelObject* newRunIn = createReplacementRunIn(oldRunIn);
destroyRunIn(oldRunIn);
// Add the run-in block as our previous sibling.
parent()->addChild(newRunIn, this);
// Make sure that the parent holding the new run-in gets layout.
parent()->setNeedsLayoutAndPrefWidthsRecalc();
}
LayoutUnit RenderBlock::collapseMargins(RenderBox* child, MarginInfo& marginInfo)
{
bool childDiscardMarginBefore = mustDiscardMarginBeforeForChild(child);
bool childDiscardMarginAfter = mustDiscardMarginAfterForChild(child);
bool childIsSelfCollapsing = child->isSelfCollapsingBlock();
// The child discards the before margin when the the after margin has discard in the case of a self collapsing block.
childDiscardMarginBefore = childDiscardMarginBefore || (childDiscardMarginAfter && childIsSelfCollapsing);
// Get the four margin values for the child and cache them.
const MarginValues childMargins = marginValuesForChild(child);
// Get our max pos and neg top margins.
LayoutUnit posTop = childMargins.positiveMarginBefore();
LayoutUnit negTop = childMargins.negativeMarginBefore();
// For self-collapsing blocks, collapse our bottom margins into our
// top to get new posTop and negTop values.
if (childIsSelfCollapsing) {
posTop = max(posTop, childMargins.positiveMarginAfter());
negTop = max(negTop, childMargins.negativeMarginAfter());
}
// See if the top margin is quirky. We only care if this child has
// margins that will collapse with us.
bool topQuirk = hasMarginBeforeQuirk(child);
if (marginInfo.canCollapseWithMarginBefore()) {
if (!childDiscardMarginBefore && !marginInfo.discardMargin()) {
// This child is collapsing with the top of the
// block. If it has larger margin values, then we need to update
// our own maximal values.
if (!document()->inQuirksMode() || !marginInfo.quirkContainer() || !topQuirk)
setMaxMarginBeforeValues(max(posTop, maxPositiveMarginBefore()), max(negTop, maxNegativeMarginBefore()));
// The minute any of the margins involved isn't a quirk, don't
// collapse it away, even if the margin is smaller (www.webreference.com
// has an example of this, a <dt> with 0.8em author-specified inside
// a <dl> inside a <td>.
if (!marginInfo.determinedMarginBeforeQuirk() && !topQuirk && (posTop - negTop)) {
setHasMarginBeforeQuirk(false);
marginInfo.setDeterminedMarginBeforeQuirk(true);
}
if (!marginInfo.determinedMarginBeforeQuirk() && topQuirk && !marginBefore())
// We have no top margin and our top child has a quirky margin.
// We will pick up this quirky margin and pass it through.
// This deals with the <td><div><p> case.
// Don't do this for a block that split two inlines though. You do
// still apply margins in this case.
setHasMarginBeforeQuirk(true);
} else
// The before margin of the container will also discard all the margins it is collapsing with.
setMustDiscardMarginBefore();
}
// Once we find a child with discardMarginBefore all the margins collapsing with us must also discard.
if (childDiscardMarginBefore) {
marginInfo.setDiscardMargin(true);
marginInfo.clearMargin();
}
if (marginInfo.quirkContainer() && marginInfo.atBeforeSideOfBlock() && (posTop - negTop))
marginInfo.setHasMarginBeforeQuirk(topQuirk);
LayoutUnit beforeCollapseLogicalTop = logicalHeight();
LayoutUnit logicalTop = beforeCollapseLogicalTop;
if (childIsSelfCollapsing) {
// For a self collapsing block both the before and after margins get discarded. The block doesn't contribute anything to the height of the block.
// Also, the child's top position equals the logical height of the container.
if (!childDiscardMarginBefore && !marginInfo.discardMargin()) {
// This child has no height. We need to compute our
// position before we collapse the child's margins together,
// so that we can get an accurate position for the zero-height block.
LayoutUnit collapsedBeforePos = max(marginInfo.positiveMargin(), childMargins.positiveMarginBefore());
LayoutUnit collapsedBeforeNeg = max(marginInfo.negativeMargin(), childMargins.negativeMarginBefore());
marginInfo.setMargin(collapsedBeforePos, collapsedBeforeNeg);
// Now collapse the child's margins together, which means examining our
// bottom margin values as well.
marginInfo.setPositiveMarginIfLarger(childMargins.positiveMarginAfter());
marginInfo.setNegativeMarginIfLarger(childMargins.negativeMarginAfter());
if (!marginInfo.canCollapseWithMarginBefore())
// We need to make sure that the position of the self-collapsing block
// is correct, since it could have overflowing content
// that needs to be positioned correctly (e.g., a block that
// had a specified height of 0 but that actually had subcontent).
logicalTop = logicalHeight() + collapsedBeforePos - collapsedBeforeNeg;
}
} else {
if (mustSeparateMarginBeforeForChild(child)) {
ASSERT(!marginInfo.discardMargin() || (marginInfo.discardMargin() && !marginInfo.margin()));
// If we are at the before side of the block and we collapse, ignore the computed margin
// and just add the child margin to the container height. This will correctly position
// the child inside the container.
LayoutUnit separateMargin = !marginInfo.canCollapseWithMarginBefore() ? marginInfo.margin() : LayoutUnit(0);
setLogicalHeight(logicalHeight() + separateMargin + marginBeforeForChild(child));
logicalTop = logicalHeight();
} else if (!marginInfo.discardMargin() && (!marginInfo.atBeforeSideOfBlock()
|| (!marginInfo.canCollapseMarginBeforeWithChildren()
&& (!document()->inQuirksMode() || !marginInfo.quirkContainer() || !marginInfo.hasMarginBeforeQuirk())))) {
// We're collapsing with a previous sibling's margins and not
// with the top of the block.
setLogicalHeight(logicalHeight() + max(marginInfo.positiveMargin(), posTop) - max(marginInfo.negativeMargin(), negTop));
logicalTop = logicalHeight();
}
marginInfo.setDiscardMargin(childDiscardMarginAfter);
if (!marginInfo.discardMargin()) {
marginInfo.setPositiveMargin(childMargins.positiveMarginAfter());
marginInfo.setNegativeMargin(childMargins.negativeMarginAfter());
} else
marginInfo.clearMargin();
if (marginInfo.margin())
marginInfo.setHasMarginAfterQuirk(hasMarginAfterQuirk(child));
}
// If margins would pull us past the top of the next page, then we need to pull back and pretend like the margins
// collapsed into the page edge.
LayoutState* layoutState = view()->layoutState();
if (layoutState->isPaginated() && layoutState->pageLogicalHeight() && logicalTop > beforeCollapseLogicalTop
&& hasNextPage(beforeCollapseLogicalTop)) {
LayoutUnit oldLogicalTop = logicalTop;
logicalTop = min(logicalTop, nextPageLogicalTop(beforeCollapseLogicalTop));
setLogicalHeight(logicalHeight() + (logicalTop - oldLogicalTop));
}
// If we have collapsed into a previous sibling and so reduced the height of the parent, ensure any floats that now
// overhang from the previous sibling are added to our parent. If the child's previous sibling itself is a float the child will avoid
// or clear it anyway, so don't worry about any floating children it may contain.
LayoutUnit oldLogicalHeight = logicalHeight();
setLogicalHeight(logicalTop);
RenderObject* prev = child->previousSibling();
if (prev && prev->isBlockFlow() && !prev->isFloatingOrOutOfFlowPositioned()) {
RenderBlock* block = toRenderBlock(prev);
if (block->containsFloats() && !block->avoidsFloats() && (block->logicalTop() + block->lowestFloatLogicalBottom()) > logicalTop)
addOverhangingFloats(block, false);
}
setLogicalHeight(oldLogicalHeight);
return logicalTop;
}
LayoutUnit RenderBlock::clearFloatsIfNeeded(RenderBox* child, MarginInfo& marginInfo, LayoutUnit oldTopPosMargin, LayoutUnit oldTopNegMargin, LayoutUnit yPos)
{
LayoutUnit heightIncrease = getClearDelta(child, yPos);
if (!heightIncrease)
return yPos;
if (child->isSelfCollapsingBlock()) {
bool childDiscardMargin = mustDiscardMarginBeforeForChild(child) || mustDiscardMarginAfterForChild(child);
// For self-collapsing blocks that clear, they can still collapse their
// margins with following siblings. Reset the current margins to represent
// the self-collapsing block's margins only.
// If DISCARD is specified for -webkit-margin-collapse, reset the margin values.
if (!childDiscardMargin) {
MarginValues childMargins = marginValuesForChild(child);
marginInfo.setPositiveMargin(max(childMargins.positiveMarginBefore(), childMargins.positiveMarginAfter()));
marginInfo.setNegativeMargin(max(childMargins.negativeMarginBefore(), childMargins.negativeMarginAfter()));
} else
marginInfo.clearMargin();
marginInfo.setDiscardMargin(childDiscardMargin);
// CSS2.1 states:
// "If the top and bottom margins of an element with clearance are adjoining, its margins collapse with
// the adjoining margins of following siblings but that resulting margin does not collapse with the bottom margin of the parent block."
// So the parent's bottom margin cannot collapse through this block or any subsequent self-collapsing blocks. Check subsequent siblings
// for a block with height - if none is found then don't allow the margins to collapse with the parent.
bool wouldCollapseMarginsWithParent = marginInfo.canCollapseMarginAfterWithChildren();
for (RenderBox* curr = child->nextSiblingBox(); curr && wouldCollapseMarginsWithParent; curr = curr->nextSiblingBox()) {
if (!curr->isFloatingOrOutOfFlowPositioned() && !curr->isSelfCollapsingBlock())
wouldCollapseMarginsWithParent = false;
}
if (wouldCollapseMarginsWithParent)
marginInfo.setCanCollapseMarginAfterWithChildren(false);
// CSS2.1: "the amount of clearance is set so that clearance + margin-top = [height of float], i.e., clearance = [height of float] - margin-top"
// Move the top of the child box to the bottom of the float ignoring the child's top margin.
LayoutUnit collapsedMargin = collapsedMarginBeforeForChild(child);
setLogicalHeight(child->logicalTop() - collapsedMargin);
// A negative collapsed margin-top value cancels itself out as it has already been factored into |yPos| above.
heightIncrease -= max(LayoutUnit(), collapsedMargin);
} else
// Increase our height by the amount we had to clear.
setLogicalHeight(logicalHeight() + heightIncrease);
if (marginInfo.canCollapseWithMarginBefore()) {
// We can no longer collapse with the top of the block since a clear
// occurred. The empty blocks collapse into the cleared block.
// FIXME: This isn't quite correct. Need clarification for what to do
// if the height the cleared block is offset by is smaller than the
// margins involved.
setMaxMarginBeforeValues(oldTopPosMargin, oldTopNegMargin);
marginInfo.setAtBeforeSideOfBlock(false);
// In case the child discarded the before margin of the block we need to reset the mustDiscardMarginBefore flag to the initial value.
setMustDiscardMarginBefore(style()->marginBeforeCollapse() == MDISCARD);
}
LayoutUnit logicalTop = yPos + heightIncrease;
// After margin collapsing, one of our floats may now intrude into the child. If the child doesn't contain floats of its own it
// won't get picked up for relayout even though the logical top estimate was wrong - so add the newly intruding float now.
if (containsFloats() && child->isRenderBlock() && !toRenderBlock(child)->containsFloats() && !child->avoidsFloats() && lowestFloatLogicalBottom() > logicalTop)
toRenderBlock(child)->addIntrudingFloats(this, logicalLeftOffsetForContent(), logicalTop);
return logicalTop;
}
void RenderBlock::marginBeforeEstimateForChild(RenderBox* child, LayoutUnit& positiveMarginBefore, LayoutUnit& negativeMarginBefore, bool& discardMarginBefore) const
{
// Give up if in quirks mode and we're a body/table cell and the top margin of the child box is quirky.
// Give up if the child specified -webkit-margin-collapse: separate that prevents collapsing.
// FIXME: Use writing mode independent accessor for marginBeforeCollapse.
if ((document()->inQuirksMode() && hasMarginAfterQuirk(child) && (isTableCell() || isBody())) || child->style()->marginBeforeCollapse() == MSEPARATE)
return;
// The margins are discarded by a child that specified -webkit-margin-collapse: discard.
// FIXME: Use writing mode independent accessor for marginBeforeCollapse.
if (child->style()->marginBeforeCollapse() == MDISCARD) {
positiveMarginBefore = 0;
negativeMarginBefore = 0;
discardMarginBefore = true;
return;
}
LayoutUnit beforeChildMargin = marginBeforeForChild(child);
positiveMarginBefore = max(positiveMarginBefore, beforeChildMargin);
negativeMarginBefore = max(negativeMarginBefore, -beforeChildMargin);
if (!child->isRenderBlock())
return;
RenderBlock* childBlock = toRenderBlock(child);
if (childBlock->childrenInline() || childBlock->isWritingModeRoot())
return;
MarginInfo childMarginInfo(childBlock, childBlock->borderBefore() + childBlock->paddingBefore(), childBlock->borderAfter() + childBlock->paddingAfter());
if (!childMarginInfo.canCollapseMarginBeforeWithChildren())
return;
RenderBox* grandchildBox = childBlock->firstChildBox();
for ( ; grandchildBox; grandchildBox = grandchildBox->nextSiblingBox()) {
if (!grandchildBox->isFloatingOrOutOfFlowPositioned())
break;
}
// Give up if there is clearance on the box, since it probably won't collapse into us.
if (!grandchildBox || grandchildBox->style()->clear() != CNONE)
return;
// Make sure to update the block margins now for the grandchild box so that we're looking at current values.
if (grandchildBox->needsLayout()) {
grandchildBox->computeAndSetBlockDirectionMargins(this);
if (grandchildBox->isRenderBlock()) {
RenderBlock* grandchildBlock = toRenderBlock(grandchildBox);
grandchildBlock->setHasMarginBeforeQuirk(grandchildBox->style()->hasMarginBeforeQuirk());
grandchildBlock->setHasMarginAfterQuirk(grandchildBox->style()->hasMarginAfterQuirk());
}
}
// Collapse the margin of the grandchild box with our own to produce an estimate.
childBlock->marginBeforeEstimateForChild(grandchildBox, positiveMarginBefore, negativeMarginBefore, discardMarginBefore);
}
LayoutUnit RenderBlock::estimateLogicalTopPosition(RenderBox* child, const MarginInfo& marginInfo, LayoutUnit& estimateWithoutPagination)
{
// FIXME: We need to eliminate the estimation of vertical position, because when it's wrong we sometimes trigger a pathological
// relayout if there are intruding floats.
LayoutUnit logicalTopEstimate = logicalHeight();
if (!marginInfo.canCollapseWithMarginBefore()) {
LayoutUnit positiveMarginBefore = 0;
LayoutUnit negativeMarginBefore = 0;
bool discardMarginBefore = false;
if (child->selfNeedsLayout()) {
// Try to do a basic estimation of how the collapse is going to go.
marginBeforeEstimateForChild(child, positiveMarginBefore, negativeMarginBefore, discardMarginBefore);
} else {
// Use the cached collapsed margin values from a previous layout. Most of the time they
// will be right.
MarginValues marginValues = marginValuesForChild(child);
positiveMarginBefore = max(positiveMarginBefore, marginValues.positiveMarginBefore());
negativeMarginBefore = max(negativeMarginBefore, marginValues.negativeMarginBefore());
discardMarginBefore = mustDiscardMarginBeforeForChild(child);
}
// Collapse the result with our current margins.
if (!discardMarginBefore)
logicalTopEstimate += max(marginInfo.positiveMargin(), positiveMarginBefore) - max(marginInfo.negativeMargin(), negativeMarginBefore);
}
// Adjust logicalTopEstimate down to the next page if the margins are so large that we don't fit on the current
// page.
LayoutState* layoutState = view()->layoutState();
if (layoutState->isPaginated() && layoutState->pageLogicalHeight() && logicalTopEstimate > logicalHeight()
&& hasNextPage(logicalHeight()))
logicalTopEstimate = min(logicalTopEstimate, nextPageLogicalTop(logicalHeight()));
logicalTopEstimate += getClearDelta(child, logicalTopEstimate);
estimateWithoutPagination = logicalTopEstimate;
if (layoutState->isPaginated()) {
// If the object has a page or column break value of "before", then we should shift to the top of the next page.
logicalTopEstimate = applyBeforeBreak(child, logicalTopEstimate);
// For replaced elements and scrolled elements, we want to shift them to the next page if they don't fit on the current one.
logicalTopEstimate = adjustForUnsplittableChild(child, logicalTopEstimate);
if (!child->selfNeedsLayout() && child->isRenderBlock())
logicalTopEstimate += toRenderBlock(child)->paginationStrut();
}
return logicalTopEstimate;
}
LayoutUnit RenderBlock::computeStartPositionDeltaForChildAvoidingFloats(const RenderBox* child, LayoutUnit childMarginStart, RenderRegion* region)
{
LayoutUnit startPosition = startOffsetForContent(region);
// Add in our start margin.
LayoutUnit oldPosition = startPosition + childMarginStart;
LayoutUnit newPosition = oldPosition;
LayoutUnit blockOffset = logicalTopForChild(child);
if (region)
blockOffset = max(blockOffset, blockOffset + (region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage()));
LayoutUnit startOff = startOffsetForLine(blockOffset, false, region, logicalHeightForChild(child));
if (style()->textAlign() != WEBKIT_CENTER && !child->style()->marginStartUsing(style()).isAuto()) {
if (childMarginStart < 0)
startOff += childMarginStart;
newPosition = max(newPosition, startOff); // Let the float sit in the child's margin if it can fit.
} else if (startOff != startPosition)
newPosition = startOff + childMarginStart;
return newPosition - oldPosition;
}
void RenderBlock::determineLogicalLeftPositionForChild(RenderBox* child, ApplyLayoutDeltaMode applyDelta)
{
LayoutUnit startPosition = borderStart() + paddingStart();
if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
startPosition -= verticalScrollbarWidth();
LayoutUnit totalAvailableLogicalWidth = borderAndPaddingLogicalWidth() + availableLogicalWidth();
// Add in our start margin.
LayoutUnit childMarginStart = marginStartForChild(child);
LayoutUnit newPosition = startPosition + childMarginStart;
// Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats. They need
// to shift over as necessary to dodge any floats that might get in the way.
if (child->avoidsFloats() && containsFloats() && !flowThreadContainingBlock())
newPosition += computeStartPositionDeltaForChildAvoidingFloats(child, marginStartForChild(child));
setLogicalLeftForChild(child, style()->isLeftToRightDirection() ? newPosition : totalAvailableLogicalWidth - newPosition - logicalWidthForChild(child), applyDelta);
}
void RenderBlock::setCollapsedBottomMargin(const MarginInfo& marginInfo)
{
if (marginInfo.canCollapseWithMarginAfter() && !marginInfo.canCollapseWithMarginBefore()) {
// Update the after side margin of the container to discard if the after margin of the last child also discards and we collapse with it.
// Don't update the max margin values because we won't need them anyway.
if (marginInfo.discardMargin()) {
setMustDiscardMarginAfter();
return;
}
// Update our max pos/neg bottom margins, since we collapsed our bottom margins
// with our children.
setMaxMarginAfterValues(max(maxPositiveMarginAfter(), marginInfo.positiveMargin()), max(maxNegativeMarginAfter(), marginInfo.negativeMargin()));
if (!marginInfo.hasMarginAfterQuirk())
setHasMarginAfterQuirk(false);
if (marginInfo.hasMarginAfterQuirk() && !marginAfter())
// We have no bottom margin and our last child has a quirky margin.
// We will pick up this quirky margin and pass it through.
// This deals with the <td><div><p> case.
setHasMarginAfterQuirk(true);
}
}
void RenderBlock::handleAfterSideOfBlock(LayoutUnit beforeSide, LayoutUnit afterSide, MarginInfo& marginInfo)
{
marginInfo.setAtAfterSideOfBlock(true);
// If we can't collapse with children then go ahead and add in the bottom margin.
if (!marginInfo.discardMargin() && (!marginInfo.canCollapseWithMarginAfter() && !marginInfo.canCollapseWithMarginBefore()
&& (!document()->inQuirksMode() || !marginInfo.quirkContainer() || !marginInfo.hasMarginAfterQuirk())))
setLogicalHeight(logicalHeight() + marginInfo.margin());
// Now add in our bottom border/padding.
setLogicalHeight(logicalHeight() + afterSide);
// Negative margins can cause our height to shrink below our minimal height (border/padding).
// If this happens, ensure that the computed height is increased to the minimal height.
setLogicalHeight(max(logicalHeight(), beforeSide + afterSide));
// Update our bottom collapsed margin info.
setCollapsedBottomMargin(marginInfo);
}
void RenderBlock::setLogicalLeftForChild(RenderBox* child, LayoutUnit logicalLeft, ApplyLayoutDeltaMode applyDelta)
{
if (isHorizontalWritingMode()) {
if (applyDelta == ApplyLayoutDelta)
view()->addLayoutDelta(LayoutSize(child->x() - logicalLeft, 0));
child->setX(logicalLeft);
} else {
if (applyDelta == ApplyLayoutDelta)
view()->addLayoutDelta(LayoutSize(0, child->y() - logicalLeft));
child->setY(logicalLeft);
}
}
void RenderBlock::setLogicalTopForChild(RenderBox* child, LayoutUnit logicalTop, ApplyLayoutDeltaMode applyDelta)
{
if (isHorizontalWritingMode()) {
if (applyDelta == ApplyLayoutDelta)
view()->addLayoutDelta(LayoutSize(0, child->y() - logicalTop));
child->setY(logicalTop);
} else {
if (applyDelta == ApplyLayoutDelta)
view()->addLayoutDelta(LayoutSize(child->x() - logicalTop, 0));
child->setX(logicalTop);
}
}
void RenderBlock::updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox* child)
{
// FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into
// an auto value. Add a method to determine this, so that we can avoid the relayout.
if (relayoutChildren || (child->hasRelativeLogicalHeight() && !isRenderView()) || child->hasViewportPercentageLogicalHeight())
child->setChildNeedsLayout(true, MarkOnlyThis);
// If relayoutChildren is set and the child has percentage padding or an embedded content box, we also need to invalidate the childs pref widths.
if (relayoutChildren && child->needsPreferredWidthsRecalculation())
child->setPreferredLogicalWidthsDirty(true, MarkOnlyThis);
}
void RenderBlock::layoutBlockChildren(bool relayoutChildren, LayoutUnit& maxFloatLogicalBottom)
{
if (gPercentHeightDescendantsMap) {
if (TrackedRendererListHashSet* descendants = gPercentHeightDescendantsMap->get(this)) {
TrackedRendererListHashSet::iterator end = descendants->end();
for (TrackedRendererListHashSet::iterator it = descendants->begin(); it != end; ++it) {
RenderBox* box = *it;
while (box != this) {
if (box->normalChildNeedsLayout())
break;
box->setChildNeedsLayout(true, MarkOnlyThis);
box = box->containingBlock();
ASSERT(box);
if (!box)
break;
}
}
}
}
LayoutUnit beforeEdge = borderBefore() + paddingBefore();
LayoutUnit afterEdge = borderAfter() + paddingAfter() + scrollbarLogicalHeight();
setLogicalHeight(beforeEdge);
// Lay out our hypothetical grid line as though it occurs at the top of the block.
if (view()->layoutState()->lineGrid() == this)
layoutLineGridBox();
// The margin struct caches all our current margin collapsing state. The compact struct caches state when we encounter compacts,
MarginInfo marginInfo(this, beforeEdge, afterEdge);
// Fieldsets need to find their legend and position it inside the border of the object.
// The legend then gets skipped during normal layout. The same is true for ruby text.
// It doesn't get included in the normal layout process but is instead skipped.
RenderObject* childToExclude = layoutSpecialExcludedChild(relayoutChildren);
LayoutUnit previousFloatLogicalBottom = 0;
maxFloatLogicalBottom = 0;
RenderBox* next = firstChildBox();
while (next) {
RenderBox* child = next;
next = child->nextSiblingBox();
if (childToExclude == child)
continue; // Skip this child, since it will be positioned by the specialized subclass (fieldsets and ruby runs).
updateBlockChildDirtyBitsBeforeLayout(relayoutChildren, child);
if (child->isOutOfFlowPositioned()) {
child->containingBlock()->insertPositionedObject(child);
adjustPositionedBlock(child, marginInfo);
continue;
}
if (child->isFloating()) {
insertFloatingObject(child);
adjustFloatingBlock(marginInfo);
continue;
}
// Lay out the child.
layoutBlockChild(child, marginInfo, previousFloatLogicalBottom, maxFloatLogicalBottom);
}
// Now do the handling of the bottom of the block, adding in our bottom border/padding and
// determining the correct collapsed bottom margin information.
handleAfterSideOfBlock(beforeEdge, afterEdge, marginInfo);
}
void RenderBlock::layoutBlockChild(RenderBox* child, MarginInfo& marginInfo, LayoutUnit& previousFloatLogicalBottom, LayoutUnit& maxFloatLogicalBottom)
{
LayoutUnit oldPosMarginBefore = maxPositiveMarginBefore();
LayoutUnit oldNegMarginBefore = maxNegativeMarginBefore();
// The child is a normal flow object. Compute the margins we will use for collapsing now.
child->computeAndSetBlockDirectionMargins(this);
// Try to guess our correct logical top position. In most cases this guess will
// be correct. Only if we're wrong (when we compute the real logical top position)
// will we have to potentially relayout.
LayoutUnit estimateWithoutPagination;
LayoutUnit logicalTopEstimate = estimateLogicalTopPosition(child, marginInfo, estimateWithoutPagination);
// Cache our old rect so that we can dirty the proper repaint rects if the child moves.
LayoutRect oldRect = child->frameRect();
LayoutUnit oldLogicalTop = logicalTopForChild(child);
#if !ASSERT_DISABLED
LayoutSize oldLayoutDelta = view()->layoutDelta();
#endif
// Go ahead and position the child as though it didn't collapse with the top.
setLogicalTopForChild(child, logicalTopEstimate, ApplyLayoutDelta);
RenderBlock* childRenderBlock = child->isRenderBlock() ? toRenderBlock(child) : 0;
bool markDescendantsWithFloats = false;
if (logicalTopEstimate != oldLogicalTop && !child->avoidsFloats() && childRenderBlock && childRenderBlock->containsFloats())
markDescendantsWithFloats = true;
#if ENABLE(SUBPIXEL_LAYOUT)
else if (UNLIKELY(logicalTopEstimate.mightBeSaturated()))
// logicalTopEstimate, returned by estimateLogicalTopPosition, might be saturated for
// very large elements. If it does the comparison with oldLogicalTop might yield a
// false negative as adding and removing margins, borders etc from a saturated number
// might yield incorrect results. If this is the case always mark for layout.
markDescendantsWithFloats = true;
#endif
else if (!child->avoidsFloats() || child->shrinkToAvoidFloats()) {
// If an element might be affected by the presence of floats, then always mark it for
// layout.
LayoutUnit fb = max(previousFloatLogicalBottom, lowestFloatLogicalBottom());
if (fb > logicalTopEstimate)
markDescendantsWithFloats = true;
}
if (childRenderBlock) {
if (markDescendantsWithFloats)
childRenderBlock->markAllDescendantsWithFloatsForLayout();
if (!child->isWritingModeRoot())
previousFloatLogicalBottom = max(previousFloatLogicalBottom, oldLogicalTop + childRenderBlock->lowestFloatLogicalBottom());
}
if (!child->needsLayout())
child->markForPaginationRelayoutIfNeeded();
bool childHadLayout = child->everHadLayout();
bool childNeededLayout = child->needsLayout();
if (childNeededLayout)
child->layout();
// Cache if we are at the top of the block right now.
bool atBeforeSideOfBlock = marginInfo.atBeforeSideOfBlock();
// Now determine the correct ypos based off examination of collapsing margin
// values.
LayoutUnit logicalTopBeforeClear = collapseMargins(child, marginInfo);
// Now check for clear.
LayoutUnit logicalTopAfterClear = clearFloatsIfNeeded(child, marginInfo, oldPosMarginBefore, oldNegMarginBefore, logicalTopBeforeClear);
bool paginated = view()->layoutState()->isPaginated();
if (paginated)
logicalTopAfterClear = adjustBlockChildForPagination(logicalTopAfterClear, estimateWithoutPagination, child,
atBeforeSideOfBlock && logicalTopBeforeClear == logicalTopAfterClear);
setLogicalTopForChild(child, logicalTopAfterClear, ApplyLayoutDelta);
// Now we have a final top position. See if it really does end up being different from our estimate.
// clearFloatsIfNeeded can also mark the child as needing a layout even though we didn't move. This happens
// when collapseMargins dynamically adds overhanging floats because of a child with negative margins.
if (logicalTopAfterClear != logicalTopEstimate || child->needsLayout() || (paginated && childRenderBlock && childRenderBlock->shouldBreakAtLineToAvoidWidow())) {
if (child->shrinkToAvoidFloats()) {
// The child's width depends on the line width.
// When the child shifts to clear an item, its width can
// change (because it has more available line width).
// So go ahead and mark the item as dirty.
child->setChildNeedsLayout(true, MarkOnlyThis);
}
if (childRenderBlock) {
if (!child->avoidsFloats() && childRenderBlock->containsFloats())
childRenderBlock->markAllDescendantsWithFloatsForLayout();
if (!child->needsLayout())
child->markForPaginationRelayoutIfNeeded();
}
// Our guess was wrong. Make the child lay itself out again.
child->layoutIfNeeded();
}
// We are no longer at the top of the block if we encounter a non-empty child.
// This has to be done after checking for clear, so that margins can be reset if a clear occurred.
if (marginInfo.atBeforeSideOfBlock() && !child->isSelfCollapsingBlock())
marginInfo.setAtBeforeSideOfBlock(false);
// Now place the child in the correct left position
determineLogicalLeftPositionForChild(child, ApplyLayoutDelta);
// Update our height now that the child has been placed in the correct position.
setLogicalHeight(logicalHeight() + logicalHeightForChild(child));
if (mustSeparateMarginAfterForChild(child)) {
setLogicalHeight(logicalHeight() + marginAfterForChild(child));
marginInfo.clearMargin();
}
// If the child has overhanging floats that intrude into following siblings (or possibly out
// of this block), then the parent gets notified of the floats now.
if (childRenderBlock && childRenderBlock->containsFloats())
maxFloatLogicalBottom = max(maxFloatLogicalBottom, addOverhangingFloats(toRenderBlock(child), !childNeededLayout));
LayoutSize childOffset = child->location() - oldRect.location();
if (childOffset.width() || childOffset.height()) {
view()->addLayoutDelta(childOffset);
// If the child moved, we have to repaint it as well as any floating/positioned
// descendants. An exception is if we need a layout. In this case, we know we're going to
// repaint ourselves (and the child) anyway.
if (childHadLayout && !selfNeedsLayout() && child->checkForRepaintDuringLayout())
child->repaintDuringLayoutIfMoved(oldRect);
}
if (!childHadLayout && child->checkForRepaintDuringLayout()) {
child->repaint();
child->repaintOverhangingFloats(true);
}
if (paginated) {
// Check for an after page/column break.
LayoutUnit newHeight = applyAfterBreak(child, logicalHeight(), marginInfo);
if (newHeight != height())
setLogicalHeight(newHeight);
}
ASSERT(view()->layoutDeltaMatches(oldLayoutDelta));
}
void RenderBlock::simplifiedNormalFlowLayout()
{
if (childrenInline()) {
ListHashSet<RootInlineBox*> lineBoxes;
for (InlineWalker walker(this); !walker.atEnd(); walker.advance()) {
RenderObject* o = walker.current();
if (!o->isOutOfFlowPositioned() && (o->isReplaced() || o->isFloating())) {
o->layoutIfNeeded();
if (toRenderBox(o)->inlineBoxWrapper()) {
RootInlineBox* box = toRenderBox(o)->inlineBoxWrapper()->root();
lineBoxes.add(box);
}
} else if (o->isText() || (o->isRenderInline() && !walker.atEndOfInline()))
o->setNeedsLayout(false);
}
// FIXME: Glyph overflow will get lost in this case, but not really a big deal.
GlyphOverflowAndFallbackFontsMap textBoxDataMap;
for (ListHashSet<RootInlineBox*>::const_iterator it = lineBoxes.begin(); it != lineBoxes.end(); ++it) {
RootInlineBox* box = *it;
box->computeOverflow(box->lineTop(), box->lineBottom(), textBoxDataMap);
}
} else {
for (RenderBox* box = firstChildBox(); box; box = box->nextSiblingBox()) {
if (!box->isOutOfFlowPositioned())
box->layoutIfNeeded();
}
}
}
bool RenderBlock::simplifiedLayout()
{
if ((!posChildNeedsLayout() && !needsSimplifiedNormalFlowLayout()) || normalChildNeedsLayout() || selfNeedsLayout())
return false;
LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasColumns() || hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode());
if (needsPositionedMovementLayout() && !tryLayoutDoingPositionedMovementOnly())
return false;
// Lay out positioned descendants or objects that just need to recompute overflow.
if (needsSimplifiedNormalFlowLayout())
simplifiedNormalFlowLayout();
// Lay out our positioned objects if our positioned child bit is set.
// Also, if an absolute position element inside a relative positioned container moves, and the absolute element has a fixed position
// child, neither the fixed element nor its container learn of the movement since posChildNeedsLayout() is only marked as far as the
// relative positioned container. So if we can have fixed pos objects in our positioned objects list check if any of them
// are statically positioned and thus need to move with their absolute ancestors.
bool canContainFixedPosObjects = canContainFixedPositionObjects();
if (posChildNeedsLayout() || canContainFixedPosObjects)
layoutPositionedObjects(false, !posChildNeedsLayout() && canContainFixedPosObjects);
// Recompute our overflow information.
// FIXME: We could do better here by computing a temporary overflow object from layoutPositionedObjects and only
// updating our overflow if we either used to have overflow or if the new temporary object has overflow.
// For now just always recompute overflow. This is no worse performance-wise than the old code that called rightmostPosition and
// lowestPosition on every relayout so it's not a regression.
// computeOverflow expects the bottom edge before we clamp our height. Since this information isn't available during
// simplifiedLayout, we cache the value in m_overflow.
LayoutUnit oldClientAfterEdge = hasRenderOverflow() ? m_overflow->layoutClientAfterEdge() : clientLogicalBottom();
computeOverflow(oldClientAfterEdge, true);
statePusher.pop();
updateLayerTransform();
updateScrollInfoAfterLayout();
setNeedsLayout(false);
return true;
}
void RenderBlock::markFixedPositionObjectForLayoutIfNeeded(RenderObject* child)
{
if (child->style()->position() != FixedPosition)
return;
bool hasStaticBlockPosition = child->style()->hasStaticBlockPosition(isHorizontalWritingMode());
bool hasStaticInlinePosition = child->style()->hasStaticInlinePosition(isHorizontalWritingMode());
if (!hasStaticBlockPosition && !hasStaticInlinePosition)
return;
RenderObject* o = child->parent();
while (o && !o->isRenderView() && o->style()->position() != AbsolutePosition)
o = o->parent();
if (o->style()->position() != AbsolutePosition)
return;
RenderBox* box = toRenderBox(child);
if (hasStaticInlinePosition) {
LogicalExtentComputedValues computedValues;
box->computeLogicalWidthInRegion(computedValues);
LayoutUnit newLeft = computedValues.m_position;
if (newLeft != box->logicalLeft())
child->setChildNeedsLayout(true, MarkOnlyThis);
} else if (hasStaticBlockPosition) {
LayoutUnit oldTop = box->logicalTop();
box->updateLogicalHeight();
if (box->logicalTop() != oldTop)
child->setChildNeedsLayout(true, MarkOnlyThis);
}
}
void RenderBlock::layoutPositionedObjects(bool relayoutChildren, bool fixedPositionObjectsOnly)
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
if (hasColumns())
view()->layoutState()->clearPaginationInformation(); // Positioned objects are not part of the column flow, so they don't paginate with the columns.
RenderBox* r;
TrackedRendererListHashSet::iterator end = positionedDescendants->end();
for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
r = *it;
// A fixed position element with an absolute positioned ancestor has no way of knowing if the latter has changed position. So
// if this is a fixed position element, mark it for layout if it has an abspos ancestor and needs to move with that ancestor, i.e.
// it has static position.
markFixedPositionObjectForLayoutIfNeeded(r);
if (fixedPositionObjectsOnly) {
r->layoutIfNeeded();
continue;
}
// When a non-positioned block element moves, it may have positioned children that are implicitly positioned relative to the
// non-positioned block. Rather than trying to detect all of these movement cases, we just always lay out positioned
// objects that are positioned implicitly like this. Such objects are rare, and so in typical DHTML menu usage (where everything is
// positioned explicitly) this should not incur a performance penalty.
if (relayoutChildren || (r->style()->hasStaticBlockPosition(isHorizontalWritingMode()) && r->parent() != this))
r->setChildNeedsLayout(true, MarkOnlyThis);
// If relayoutChildren is set and the child has percentage padding or an embedded content box, we also need to invalidate the childs pref widths.
if (relayoutChildren && r->needsPreferredWidthsRecalculation())
r->setPreferredLogicalWidthsDirty(true, MarkOnlyThis);
if (!r->needsLayout())
r->markForPaginationRelayoutIfNeeded();
// We don't have to do a full layout. We just have to update our position. Try that first. If we have shrink-to-fit width
// and we hit the available width constraint, the layoutIfNeeded() will catch it and do a full layout.
if (r->needsPositionedMovementLayoutOnly() && r->tryLayoutDoingPositionedMovementOnly())
r->setNeedsLayout(false);
// If we are paginated or in a line grid, go ahead and compute a vertical position for our object now.
// If it's wrong we'll lay out again.
LayoutUnit oldLogicalTop = 0;
bool needsBlockDirectionLocationSetBeforeLayout = r->needsLayout() && view()->layoutState()->needsBlockDirectionLocationSetBeforeLayout();
if (needsBlockDirectionLocationSetBeforeLayout) {
if (isHorizontalWritingMode() == r->isHorizontalWritingMode())
r->updateLogicalHeight();
else
r->updateLogicalWidth();
oldLogicalTop = logicalTopForChild(r);
}
r->layoutIfNeeded();
// Lay out again if our estimate was wrong.
if (needsBlockDirectionLocationSetBeforeLayout && logicalTopForChild(r) != oldLogicalTop) {
r->setChildNeedsLayout(true, MarkOnlyThis);
r->layoutIfNeeded();
}
}
if (hasColumns())
view()->layoutState()->m_columnInfo = columnInfo(); // FIXME: Kind of gross. We just put this back into the layout state so that pop() will work.
}
void RenderBlock::markPositionedObjectsForLayout()
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (positionedDescendants) {
RenderBox* r;
TrackedRendererListHashSet::iterator end = positionedDescendants->end();
for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
r = *it;
r->setChildNeedsLayout(true);
}
}
}
void RenderBlock::markForPaginationRelayoutIfNeeded()
{
ASSERT(!needsLayout());
if (needsLayout())
return;
if (view()->layoutState()->pageLogicalHeightChanged() || (view()->layoutState()->pageLogicalHeight() && view()->layoutState()->pageLogicalOffset(this, logicalTop()) != pageLogicalOffset()) || shouldBreakAtLineToAvoidWidow())
setChildNeedsLayout(true, MarkOnlyThis);
}
void RenderBlock::repaintOverhangingFloats(bool paintAllDescendants)
{
// Repaint any overhanging floats (if we know we're the one to paint them).
// Otherwise, bail out.
if (!hasOverhangingFloats())
return;
// FIXME: Avoid disabling LayoutState. At the very least, don't disable it for floats originating
// in this block. Better yet would be to push extra state for the containers of other floats.
LayoutStateDisabler layoutStateDisabler(view());
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
// Only repaint the object if it is overhanging, is not in its own layer, and
// is our responsibility to paint (m_shouldPaint is set). When paintAllDescendants is true, the latter
// condition is replaced with being a descendant of us.
if (logicalBottomForFloat(r) > logicalHeight() && ((paintAllDescendants && r->m_renderer->isDescendantOf(this)) || r->shouldPaint()) && !r->m_renderer->hasSelfPaintingLayer()) {
r->m_renderer->repaint();
r->m_renderer->repaintOverhangingFloats(false);
}
}
}
void RenderBlock::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutPoint adjustedPaintOffset = paintOffset + location();
PaintPhase phase = paintInfo.phase;
// Check if we need to do anything at all.
// FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView
// paints the root's background.
if (!isRoot()) {
LayoutRect overflowBox = overflowRectForPaintRejection();
flipForWritingMode(overflowBox);
overflowBox.inflate(maximalOutlineSize(paintInfo.phase));
overflowBox.moveBy(adjustedPaintOffset);
if (!overflowBox.intersects(paintInfo.rect))
return;
}
bool pushedClip = pushContentsClip(paintInfo, adjustedPaintOffset);
paintObject(paintInfo, adjustedPaintOffset);
if (pushedClip)
popContentsClip(paintInfo, phase, adjustedPaintOffset);
// Our scrollbar widgets paint exactly when we tell them to, so that they work properly with
// z-index. We paint after we painted the background/border, so that the scrollbars will
// sit above the background/border.
if (hasOverflowClip() && style()->visibility() == VISIBLE && (phase == PaintPhaseBlockBackground || phase == PaintPhaseChildBlockBackground) && paintInfo.shouldPaintWithinRoot(this) && !paintInfo.paintRootBackgroundOnly())
layer()->paintOverflowControls(paintInfo.context, roundedIntPoint(adjustedPaintOffset), paintInfo.rect);
}
void RenderBlock::paintColumnRules(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (paintInfo.context->paintingDisabled())
return;
const Color& ruleColor = style()->visitedDependentColor(CSSPropertyWebkitColumnRuleColor);
bool ruleTransparent = style()->columnRuleIsTransparent();
EBorderStyle ruleStyle = style()->columnRuleStyle();
LayoutUnit ruleThickness = style()->columnRuleWidth();
LayoutUnit colGap = columnGap();
bool renderRule = ruleStyle > BHIDDEN && !ruleTransparent;
if (!renderRule)
return;
ColumnInfo* colInfo = columnInfo();
unsigned colCount = columnCount(colInfo);
bool antialias = shouldAntialiasLines(paintInfo.context);
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis) {
bool leftToRight = style()->isLeftToRightDirection() ^ colInfo->progressionIsReversed();
LayoutUnit currLogicalLeftOffset = leftToRight ? LayoutUnit() : contentLogicalWidth();
LayoutUnit ruleAdd = logicalLeftOffsetForContent();
LayoutUnit ruleLogicalLeft = leftToRight ? LayoutUnit() : contentLogicalWidth();
LayoutUnit inlineDirectionSize = colInfo->desiredColumnWidth();
BoxSide boxSide = isHorizontalWritingMode()
? leftToRight ? BSLeft : BSRight
: leftToRight ? BSTop : BSBottom;
for (unsigned i = 0; i < colCount; i++) {
// Move to the next position.
if (leftToRight) {
ruleLogicalLeft += inlineDirectionSize + colGap / 2;
currLogicalLeftOffset += inlineDirectionSize + colGap;
} else {
ruleLogicalLeft -= (inlineDirectionSize + colGap / 2);
currLogicalLeftOffset -= (inlineDirectionSize + colGap);
}
// Now paint the column rule.
if (i < colCount - 1) {
LayoutUnit ruleLeft = isHorizontalWritingMode() ? paintOffset.x() + ruleLogicalLeft - ruleThickness / 2 + ruleAdd : paintOffset.x() + borderLeft() + paddingLeft();
LayoutUnit ruleRight = isHorizontalWritingMode() ? ruleLeft + ruleThickness : ruleLeft + contentWidth();
LayoutUnit ruleTop = isHorizontalWritingMode() ? paintOffset.y() + borderTop() + paddingTop() : paintOffset.y() + ruleLogicalLeft - ruleThickness / 2 + ruleAdd;
LayoutUnit ruleBottom = isHorizontalWritingMode() ? ruleTop + contentHeight() : ruleTop + ruleThickness;
IntRect pixelSnappedRuleRect = pixelSnappedIntRectFromEdges(ruleLeft, ruleTop, ruleRight, ruleBottom);
drawLineForBoxSide(paintInfo.context, pixelSnappedRuleRect.x(), pixelSnappedRuleRect.y(), pixelSnappedRuleRect.maxX(), pixelSnappedRuleRect.maxY(), boxSide, ruleColor, ruleStyle, 0, 0, antialias);
}
ruleLogicalLeft = currLogicalLeftOffset;
}
} else {
bool topToBottom = !style()->isFlippedBlocksWritingMode() ^ colInfo->progressionIsReversed();
LayoutUnit ruleLeft = isHorizontalWritingMode()
? borderLeft() + paddingLeft()
: colGap / 2 - colGap - ruleThickness / 2 + (!colInfo->progressionIsReversed() ? borderBefore() + paddingBefore() : borderAfter() + paddingAfter());
LayoutUnit ruleWidth = isHorizontalWritingMode() ? contentWidth() : ruleThickness;
LayoutUnit ruleTop = isHorizontalWritingMode()
? colGap / 2 - colGap - ruleThickness / 2 + (!colInfo->progressionIsReversed() ? borderBefore() + paddingBefore() : borderAfter() + paddingAfter())
: borderStart() + paddingStart();
LayoutUnit ruleHeight = isHorizontalWritingMode() ? ruleThickness : contentHeight();
LayoutRect ruleRect(ruleLeft, ruleTop, ruleWidth, ruleHeight);
if (!topToBottom) {
if (isHorizontalWritingMode())
ruleRect.setY(height() - ruleRect.maxY());
else
ruleRect.setX(width() - ruleRect.maxX());
}
ruleRect.moveBy(paintOffset);
BoxSide boxSide = isHorizontalWritingMode()
? topToBottom ? BSTop : BSBottom
: topToBottom ? BSLeft : BSRight;
LayoutSize step(0, topToBottom ? colInfo->columnHeight() + colGap : -(colInfo->columnHeight() + colGap));
if (!isHorizontalWritingMode())
step = step.transposedSize();
for (unsigned i = 1; i < colCount; i++) {
ruleRect.move(step);
IntRect pixelSnappedRuleRect = pixelSnappedIntRect(ruleRect);
drawLineForBoxSide(paintInfo.context, pixelSnappedRuleRect.x(), pixelSnappedRuleRect.y(), pixelSnappedRuleRect.maxX(), pixelSnappedRuleRect.maxY(), boxSide, ruleColor, ruleStyle, 0, 0, antialias);
}
}
}
void RenderBlock::paintColumnContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset, bool paintingFloats)
{
// We need to do multiple passes, breaking up our child painting into strips.
GraphicsContext* context = paintInfo.context;
ColumnInfo* colInfo = columnInfo();
unsigned colCount = columnCount(colInfo);
if (!colCount)
return;
LayoutUnit currLogicalTopOffset = 0;
LayoutUnit colGap = columnGap();
for (unsigned i = 0; i < colCount; i++) {
// For each rect, we clip to the rect, and then we adjust our coords.
LayoutRect colRect = columnRectAt(colInfo, i);
flipForWritingMode(colRect);
LayoutUnit logicalLeftOffset = (isHorizontalWritingMode() ? colRect.x() : colRect.y()) - logicalLeftOffsetForContent();
LayoutSize offset = isHorizontalWritingMode() ? LayoutSize(logicalLeftOffset, currLogicalTopOffset) : LayoutSize(currLogicalTopOffset, logicalLeftOffset);
if (colInfo->progressionAxis() == ColumnInfo::BlockAxis) {
if (isHorizontalWritingMode())
offset.expand(0, colRect.y() - borderTop() - paddingTop());
else
offset.expand(colRect.x() - borderLeft() - paddingLeft(), 0);
}
colRect.moveBy(paintOffset);
PaintInfo info(paintInfo);
info.rect.intersect(pixelSnappedIntRect(colRect));
if (!info.rect.isEmpty()) {
GraphicsContextStateSaver stateSaver(*context);
LayoutRect clipRect(colRect);
if (i < colCount - 1) {
if (isHorizontalWritingMode())
clipRect.expand(colGap / 2, 0);
else
clipRect.expand(0, colGap / 2);
}
// Each strip pushes a clip, since column boxes are specified as being
// like overflow:hidden.
// FIXME: Content and column rules that extend outside column boxes at the edges of the multi-column element
// are clipped according to the 'overflow' property.
context->clip(pixelSnappedIntRect(clipRect));
// Adjust our x and y when painting.
LayoutPoint adjustedPaintOffset = paintOffset + offset;
if (paintingFloats)
paintFloats(info, adjustedPaintOffset, paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip);
else
paintContents(info, adjustedPaintOffset);
}
LayoutUnit blockDelta = (isHorizontalWritingMode() ? colRect.height() : colRect.width());
if (style()->isFlippedBlocksWritingMode())
currLogicalTopOffset += blockDelta;
else
currLogicalTopOffset -= blockDelta;
}
}
void RenderBlock::paintContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
// Avoid painting descendants of the root element when stylesheets haven't loaded. This eliminates FOUC.
// It's ok not to draw, because later on, when all the stylesheets do load, styleResolverChanged() on the Document
// will do a full repaint.
if (document()->didLayoutWithPendingStylesheets() && !isRenderView())
return;
if (childrenInline())
m_lineBoxes.paint(this, paintInfo, paintOffset);
else {
PaintPhase newPhase = (paintInfo.phase == PaintPhaseChildOutlines) ? PaintPhaseOutline : paintInfo.phase;
newPhase = (newPhase == PaintPhaseChildBlockBackgrounds) ? PaintPhaseChildBlockBackground : newPhase;
// We don't paint our own background, but we do let the kids paint their backgrounds.
PaintInfo paintInfoForChild(paintInfo);
paintInfoForChild.phase = newPhase;
paintInfoForChild.updateSubtreePaintRootForChildren(this);
// FIXME: Paint-time pagination is obsolete and is now only used by embedded WebViews inside AppKit
// NSViews. Do not add any more code for this.
bool usePrintRect = !view()->printRect().isEmpty();
paintChildren(paintInfo, paintOffset, paintInfoForChild, usePrintRect);
}
}
void RenderBlock::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOffset, PaintInfo& paintInfoForChild, bool usePrintRect)
{
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (!paintChild(child, paintInfo, paintOffset, paintInfoForChild, usePrintRect))
return;
}
}
bool RenderBlock::paintChild(RenderBox* child, PaintInfo& paintInfo, const LayoutPoint& paintOffset, PaintInfo& paintInfoForChild, bool usePrintRect)
{
// Check for page-break-before: always, and if it's set, break and bail.
bool checkBeforeAlways = !childrenInline() && (usePrintRect && child->style()->pageBreakBefore() == PBALWAYS);
LayoutUnit absoluteChildY = paintOffset.y() + child->y();
if (checkBeforeAlways
&& absoluteChildY > paintInfo.rect.y()
&& absoluteChildY < paintInfo.rect.maxY()) {
view()->setBestTruncatedAt(absoluteChildY, this, true);
return false;
}
RenderView* renderView = view();
if (!child->isFloating() && child->isReplaced() && usePrintRect && child->height() <= renderView->printRect().height()) {
// Paginate block-level replaced elements.
if (absoluteChildY + child->height() > renderView->printRect().maxY()) {
if (absoluteChildY < renderView->truncatedAt())
renderView->setBestTruncatedAt(absoluteChildY, child);
// If we were able to truncate, don't paint.
if (absoluteChildY >= renderView->truncatedAt())
return false;
}
}
LayoutPoint childPoint = flipForWritingModeForChild(child, paintOffset);
if (!child->hasSelfPaintingLayer() && !child->isFloating())
child->paint(paintInfoForChild, childPoint);
// Check for page-break-after: always, and if it's set, break and bail.
bool checkAfterAlways = !childrenInline() && (usePrintRect && child->style()->pageBreakAfter() == PBALWAYS);
if (checkAfterAlways
&& (absoluteChildY + child->height()) > paintInfo.rect.y()
&& (absoluteChildY + child->height()) < paintInfo.rect.maxY()) {
view()->setBestTruncatedAt(absoluteChildY + child->height() + max<LayoutUnit>(0, child->collapsedMarginAfter()), this, true);
return false;
}
return true;
}
void RenderBlock::paintCaret(PaintInfo& paintInfo, const LayoutPoint& paintOffset, CaretType type)
{
// Paint the caret if the FrameSelection says so or if caret browsing is enabled
bool caretBrowsing = frame()->settings() && frame()->settings()->caretBrowsingEnabled();
RenderObject* caretPainter;
bool isContentEditable;
if (type == CursorCaret) {
caretPainter = frame()->selection()->caretRenderer();
isContentEditable = frame()->selection()->rendererIsEditable();
} else {
caretPainter = frame()->page()->dragCaretController()->caretRenderer();
isContentEditable = frame()->page()->dragCaretController()->isContentEditable();
}
if (caretPainter == this && (isContentEditable || caretBrowsing)) {
if (type == CursorCaret)
frame()->selection()->paintCaret(paintInfo.context, paintOffset, paintInfo.rect);
else
frame()->page()->dragCaretController()->paintDragCaret(frame(), paintInfo.context, paintOffset, paintInfo.rect);
}
}
void RenderBlock::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
PaintPhase paintPhase = paintInfo.phase;
// 1. paint background, borders etc
if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && style()->visibility() == VISIBLE) {
if (hasBoxDecorations())
paintBoxDecorations(paintInfo, paintOffset);
if (hasColumns() && !paintInfo.paintRootBackgroundOnly())
paintColumnRules(paintInfo, paintOffset);
}
if (paintPhase == PaintPhaseMask && style()->visibility() == VISIBLE) {
paintMask(paintInfo, paintOffset);
return;
}
// We're done. We don't bother painting any children.
if (paintPhase == PaintPhaseBlockBackground || paintInfo.paintRootBackgroundOnly())
return;
// Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).
LayoutPoint scrolledOffset = paintOffset;
if (hasOverflowClip())
scrolledOffset.move(-scrolledContentOffset());
// 2. paint contents
if (paintPhase != PaintPhaseSelfOutline) {
if (hasColumns())
paintColumnContents(paintInfo, scrolledOffset);
else
paintContents(paintInfo, scrolledOffset);
}
// 3. paint selection
// FIXME: Make this work with multi column layouts. For now don't fill gaps.
bool isPrinting = document()->printing();
if (!isPrinting && !hasColumns())
paintSelection(paintInfo, scrolledOffset); // Fill in gaps in selection on lines and between blocks.
// 4. paint floats.
if (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip) {
if (hasColumns())
paintColumnContents(paintInfo, scrolledOffset, true);
else
paintFloats(paintInfo, scrolledOffset, paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip);
}
// 5. paint outline.
if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE)
paintOutline(paintInfo, LayoutRect(paintOffset, size()));
// 6. paint continuation outlines.
if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) {
RenderInline* inlineCont = inlineElementContinuation();
if (inlineCont && inlineCont->hasOutline() && inlineCont->style()->visibility() == VISIBLE) {
RenderInline* inlineRenderer = toRenderInline(inlineCont->node()->renderer());
RenderBlock* cb = containingBlock();
bool inlineEnclosedInSelfPaintingLayer = false;
for (RenderBoxModelObject* box = inlineRenderer; box != cb; box = box->parent()->enclosingBoxModelObject()) {
if (box->hasSelfPaintingLayer()) {
inlineEnclosedInSelfPaintingLayer = true;
break;
}
}
// Do not add continuations for outline painting by our containing block if we are a relative positioned
// anonymous block (i.e. have our own layer), paint them straightaway instead. This is because a block depends on renderers in its continuation table being
// in the same layer.
if (!inlineEnclosedInSelfPaintingLayer && !hasLayer())
cb->addContinuationWithOutline(inlineRenderer);
else if (!inlineRenderer->firstLineBox() || (!inlineEnclosedInSelfPaintingLayer && hasLayer()))
inlineRenderer->paintOutline(paintInfo, paintOffset - locationOffset() + inlineRenderer->containingBlock()->location());
}
paintContinuationOutlines(paintInfo, paintOffset);
}
// 7. paint caret.
// If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground,
// then paint the caret.
if (paintPhase == PaintPhaseForeground) {
paintCaret(paintInfo, paintOffset, CursorCaret);
paintCaret(paintInfo, paintOffset, DragCaret);
}
}
LayoutPoint RenderBlock::flipFloatForWritingModeForChild(const FloatingObject* child, const LayoutPoint& point) const
{
if (!style()->isFlippedBlocksWritingMode())
return point;
// This is similar to RenderBox::flipForWritingModeForChild. We have to subtract out our left/top offsets twice, since
// it's going to get added back in. We hide this complication here so that the calling code looks normal for the unflipped
// case.
if (isHorizontalWritingMode())
return LayoutPoint(point.x(), point.y() + height() - child->renderer()->height() - 2 * yPositionForFloatIncludingMargin(child));
return LayoutPoint(point.x() + width() - child->renderer()->width() - 2 * xPositionForFloatIncludingMargin(child), point.y());
}
void RenderBlock::paintFloats(PaintInfo& paintInfo, const LayoutPoint& paintOffset, bool preservePhase)
{
if (!m_floatingObjects)
return;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
// Only paint the object if our m_shouldPaint flag is set.
if (r->shouldPaint() && !r->m_renderer->hasSelfPaintingLayer()) {
PaintInfo currentPaintInfo(paintInfo);
currentPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground;
LayoutPoint childPoint = flipFloatForWritingModeForChild(r, LayoutPoint(paintOffset.x() + xPositionForFloatIncludingMargin(r) - r->m_renderer->x(), paintOffset.y() + yPositionForFloatIncludingMargin(r) - r->m_renderer->y()));
r->m_renderer->paint(currentPaintInfo, childPoint);
if (!preservePhase) {
currentPaintInfo.phase = PaintPhaseChildBlockBackgrounds;
r->m_renderer->paint(currentPaintInfo, childPoint);
currentPaintInfo.phase = PaintPhaseFloat;
r->m_renderer->paint(currentPaintInfo, childPoint);
currentPaintInfo.phase = PaintPhaseForeground;
r->m_renderer->paint(currentPaintInfo, childPoint);
currentPaintInfo.phase = PaintPhaseOutline;
r->m_renderer->paint(currentPaintInfo, childPoint);
}
}
}
}
RenderInline* RenderBlock::inlineElementContinuation() const
{
RenderBoxModelObject* continuation = this->continuation();
return continuation && continuation->isInline() ? toRenderInline(continuation) : 0;
}
RenderBlock* RenderBlock::blockElementContinuation() const
{
RenderBoxModelObject* currentContinuation = continuation();
if (!currentContinuation || currentContinuation->isInline())
return 0;
RenderBlock* nextContinuation = toRenderBlock(currentContinuation);
if (nextContinuation->isAnonymousBlock())
return nextContinuation->blockElementContinuation();
return nextContinuation;
}
static ContinuationOutlineTableMap* continuationOutlineTable()
{
DEFINE_STATIC_LOCAL(ContinuationOutlineTableMap, table, ());
return &table;
}
void RenderBlock::addContinuationWithOutline(RenderInline* flow)
{
// We can't make this work if the inline is in a layer. We'll just rely on the broken
// way of painting.
ASSERT(!flow->layer() && !flow->isInlineElementContinuation());
ContinuationOutlineTableMap* table = continuationOutlineTable();
ListHashSet<RenderInline*>* continuations = table->get(this);
if (!continuations) {
continuations = new ListHashSet<RenderInline*>;
table->set(this, adoptPtr(continuations));
}
continuations->add(flow);
}
bool RenderBlock::paintsContinuationOutline(RenderInline* flow)
{
ContinuationOutlineTableMap* table = continuationOutlineTable();
if (table->isEmpty())
return false;
ListHashSet<RenderInline*>* continuations = table->get(this);
if (!continuations)
return false;
return continuations->contains(flow);
}
void RenderBlock::paintContinuationOutlines(PaintInfo& info, const LayoutPoint& paintOffset)
{
ContinuationOutlineTableMap* table = continuationOutlineTable();
if (table->isEmpty())
return;
OwnPtr<ListHashSet<RenderInline*> > continuations = table->take(this);
if (!continuations)
return;
LayoutPoint accumulatedPaintOffset = paintOffset;
// Paint each continuation outline.
ListHashSet<RenderInline*>::iterator end = continuations->end();
for (ListHashSet<RenderInline*>::iterator it = continuations->begin(); it != end; ++it) {
// Need to add in the coordinates of the intervening blocks.
RenderInline* flow = *it;
RenderBlock* block = flow->containingBlock();
for ( ; block && block != this; block = block->containingBlock())
accumulatedPaintOffset.moveBy(block->location());
ASSERT(block);
flow->paintOutline(info, accumulatedPaintOffset);
}
}
bool RenderBlock::shouldPaintSelectionGaps() const
{
return selectionState() != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot();
}
bool RenderBlock::isSelectionRoot() const
{
if (isPseudoElement())
return false;
ASSERT(node() || isAnonymous());
// FIXME: Eventually tables should have to learn how to fill gaps between cells, at least in simple non-spanning cases.
if (isTable())
return false;
if (isBody() || isRoot() || hasOverflowClip()
|| isPositioned() || isFloating()
|| isTableCell() || isInlineBlockOrInlineTable()
|| hasTransform() || hasReflection() || hasMask() || isWritingModeRoot()
|| isRenderFlowThread())
return true;
if (view() && view()->selectionStart()) {
Node* startElement = view()->selectionStart()->node();
if (startElement && startElement->rootEditableElement() == node())
return true;
}
return false;
}
GapRects RenderBlock::selectionGapRectsForRepaint(const RenderLayerModelObject* repaintContainer)
{
ASSERT(!needsLayout());
if (!shouldPaintSelectionGaps())
return GapRects();
TransformState transformState(TransformState::ApplyTransformDirection, FloatPoint());
mapLocalToContainer(repaintContainer, transformState, ApplyContainerFlip | UseTransforms);
LayoutPoint offsetFromRepaintContainer = roundedLayoutPoint(transformState.mappedPoint());
if (hasOverflowClip())
offsetFromRepaintContainer -= scrolledContentOffset();
LogicalSelectionOffsetCaches cache(this);
LayoutUnit lastTop = 0;
LayoutUnit lastLeft = logicalLeftSelectionOffset(this, lastTop, cache);
LayoutUnit lastRight = logicalRightSelectionOffset(this, lastTop, cache);
return selectionGaps(this, offsetFromRepaintContainer, IntSize(), lastTop, lastLeft, lastRight, cache);
}
void RenderBlock::paintSelection(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) {
LogicalSelectionOffsetCaches cache(this);
LayoutUnit lastTop = 0;
LayoutUnit lastLeft = logicalLeftSelectionOffset(this, lastTop, cache);
LayoutUnit lastRight = logicalRightSelectionOffset(this, lastTop, cache);
GraphicsContextStateSaver stateSaver(*paintInfo.context);
LayoutRect gapRectsBounds = selectionGaps(this, paintOffset, LayoutSize(), lastTop, lastLeft, lastRight, cache, &paintInfo);
if (!gapRectsBounds.isEmpty()) {
if (RenderLayer* layer = enclosingLayer()) {
gapRectsBounds.moveBy(-paintOffset);
if (!hasLayer()) {
LayoutRect localBounds(gapRectsBounds);
flipForWritingMode(localBounds);
gapRectsBounds = localToContainerQuad(FloatRect(localBounds), layer->renderer()).enclosingBoundingBox();
if (layer->renderer()->hasOverflowClip())
gapRectsBounds.move(layer->renderBox()->scrolledContentOffset());
}
layer->addBlockSelectionGapsBounds(gapRectsBounds);
}
}
}
}
static void clipOutPositionedObjects(const PaintInfo* paintInfo, const LayoutPoint& offset, TrackedRendererListHashSet* positionedObjects)
{
if (!positionedObjects)
return;
TrackedRendererListHashSet::const_iterator end = positionedObjects->end();
for (TrackedRendererListHashSet::const_iterator it = positionedObjects->begin(); it != end; ++it) {
RenderBox* r = *it;
paintInfo->context->clipOut(IntRect(offset.x() + r->x(), offset.y() + r->y(), r->width(), r->height()));
}
}
static LayoutUnit blockDirectionOffset(RenderBlock* rootBlock, const LayoutSize& offsetFromRootBlock)
{
return rootBlock->isHorizontalWritingMode() ? offsetFromRootBlock.height() : offsetFromRootBlock.width();
}
static LayoutUnit inlineDirectionOffset(RenderBlock* rootBlock, const LayoutSize& offsetFromRootBlock)
{
return rootBlock->isHorizontalWritingMode() ? offsetFromRootBlock.width() : offsetFromRootBlock.height();
}
LayoutRect RenderBlock::logicalRectToPhysicalRect(const LayoutPoint& rootBlockPhysicalPosition, const LayoutRect& logicalRect)
{
LayoutRect result;
if (isHorizontalWritingMode())
result = logicalRect;
else
result = LayoutRect(logicalRect.y(), logicalRect.x(), logicalRect.height(), logicalRect.width());
flipForWritingMode(result);
result.moveBy(rootBlockPhysicalPosition);
return result;
}
GapRects RenderBlock::selectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
// IMPORTANT: Callers of this method that intend for painting to happen need to do a save/restore.
// Clip out floating and positioned objects when painting selection gaps.
if (paintInfo) {
// Note that we don't clip out overflow for positioned objects. We just stick to the border box.
LayoutRect flippedBlockRect(offsetFromRootBlock.width(), offsetFromRootBlock.height(), width(), height());
rootBlock->flipForWritingMode(flippedBlockRect);
flippedBlockRect.moveBy(rootBlockPhysicalPosition);
clipOutPositionedObjects(paintInfo, flippedBlockRect.location(), positionedObjects());
if (isBody() || isRoot()) // The <body> must make sure to examine its containingBlock's positioned objects.
for (RenderBlock* cb = containingBlock(); cb && !cb->isRenderView(); cb = cb->containingBlock())
clipOutPositionedObjects(paintInfo, LayoutPoint(cb->x(), cb->y()), cb->positionedObjects()); // FIXME: Not right for flipped writing modes.
if (m_floatingObjects) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
LayoutRect floatBox(offsetFromRootBlock.width() + xPositionForFloatIncludingMargin(r),
offsetFromRootBlock.height() + yPositionForFloatIncludingMargin(r),
r->m_renderer->width(), r->m_renderer->height());
rootBlock->flipForWritingMode(floatBox);
floatBox.move(rootBlockPhysicalPosition.x(), rootBlockPhysicalPosition.y());
paintInfo->context->clipOut(pixelSnappedIntRect(floatBox));
}
}
}
// FIXME: overflow: auto/scroll regions need more math here, since painting in the border box is different from painting in the padding box (one is scrolled, the other is
// fixed).
GapRects result;
if (!isBlockFlow()) // FIXME: Make multi-column selection gap filling work someday.
return result;
if (hasColumns() || hasTransform() || style()->columnSpan()) {
// FIXME: We should learn how to gap fill multiple columns and transforms eventually.
lastLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalHeight();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, logicalHeight(), cache);
lastLogicalRight = logicalRightSelectionOffset(rootBlock, logicalHeight(), cache);
return result;
}
if (childrenInline())
result = inlineSelectionGaps(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, lastLogicalTop, lastLogicalLeft, lastLogicalRight, cache, paintInfo);
else
result = blockSelectionGaps(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, lastLogicalTop, lastLogicalLeft, lastLogicalRight, cache, paintInfo);
// Go ahead and fill the vertical gap all the way to the bottom of our block if the selection extends past our block.
if (rootBlock == this && (selectionState() != SelectionBoth && selectionState() != SelectionEnd)) {
result.uniteCenter(blockSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
lastLogicalTop, lastLogicalLeft, lastLogicalRight, logicalHeight(), cache, paintInfo));
}
return result;
}
GapRects RenderBlock::inlineSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
GapRects result;
bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth;
if (!firstLineBox()) {
if (containsStart) {
// Go ahead and update our lastLogicalTop to be the bottom of the block. <hr>s or empty blocks with height can trip this
// case.
lastLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalHeight();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, logicalHeight(), cache);
lastLogicalRight = logicalRightSelectionOffset(rootBlock, logicalHeight(), cache);
}
return result;
}
RootInlineBox* lastSelectedLine = 0;
RootInlineBox* curr;
for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { }
// Now paint the gaps for the lines.
for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) {
LayoutUnit selTop = curr->selectionTopAdjustedForPrecedingBlock();
LayoutUnit selHeight = curr->selectionHeightAdjustedForPrecedingBlock();
if (!containsStart && !lastSelectedLine &&
selectionState() != SelectionStart && selectionState() != SelectionBoth)
result.uniteCenter(blockSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, lastLogicalTop, lastLogicalLeft, lastLogicalRight, selTop, cache, paintInfo));
LayoutRect logicalRect(curr->logicalLeft(), selTop, curr->logicalWidth(), selTop + selHeight);
logicalRect.move(isHorizontalWritingMode() ? offsetFromRootBlock : offsetFromRootBlock.transposedSize());
LayoutRect physicalRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, logicalRect);
if (!paintInfo || (isHorizontalWritingMode() && physicalRect.y() < paintInfo->rect.maxY() && physicalRect.maxY() > paintInfo->rect.y())
|| (!isHorizontalWritingMode() && physicalRect.x() < paintInfo->rect.maxX() && physicalRect.maxX() > paintInfo->rect.x()))
result.unite(curr->lineSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, selTop, selHeight, cache, paintInfo));
lastSelectedLine = curr;
}
if (containsStart && !lastSelectedLine)
// VisibleSelection must start just after our last line.
lastSelectedLine = lastRootBox();
if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) {
// Go ahead and update our lastY to be the bottom of the last selected line.
lastLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + lastSelectedLine->selectionBottom();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, lastSelectedLine->selectionBottom(), cache);
lastLogicalRight = logicalRightSelectionOffset(rootBlock, lastSelectedLine->selectionBottom(), cache);
}
return result;
}
GapRects RenderBlock::blockSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
GapRects result;
// Go ahead and jump right to the first block child that contains some selected objects.
RenderBox* curr;
for (curr = firstChildBox(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSiblingBox()) { }
if (!curr)
return result;
LogicalSelectionOffsetCaches childCache(this, cache);
for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSiblingBox()) {
SelectionState childState = curr->selectionState();
if (childState == SelectionBoth || childState == SelectionEnd)
sawSelectionEnd = true;
if (curr->isFloatingOrOutOfFlowPositioned())
continue; // We must be a normal flow object in order to even be considered.
if (curr->hasPaintOffset() && curr->hasLayer()) {
// If the relposition offset is anything other than 0, then treat this just like an absolute positioned element.
// Just disregard it completely.
LayoutSize relOffset = curr->layer()->paintOffset();
if (relOffset.width() || relOffset.height())
continue;
}
bool paintsOwnSelection = curr->shouldPaintSelectionGaps() || curr->isTable(); // FIXME: Eventually we won't special-case table like this.
bool fillBlockGaps = paintsOwnSelection || (curr->canBeSelectionLeaf() && childState != SelectionNone);
if (fillBlockGaps) {
// We need to fill the vertical gap above this object.
if (childState == SelectionEnd || childState == SelectionInside) {
// Fill the gap above the object.
result.uniteCenter(blockSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
lastLogicalTop, lastLogicalLeft, lastLogicalRight, curr->logicalTop(), cache, paintInfo));
}
// Only fill side gaps for objects that paint their own selection if we know for sure the selection is going to extend all the way *past*
// our object. We know this if the selection did not end inside our object.
if (paintsOwnSelection && (childState == SelectionStart || sawSelectionEnd))
childState = SelectionNone;
// Fill side gaps on this object based off its state.
bool leftGap, rightGap;
getSelectionGapInfo(childState, leftGap, rightGap);
if (leftGap)
result.uniteLeft(logicalLeftSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, this, curr->logicalLeft(), curr->logicalTop(), curr->logicalHeight(), cache, paintInfo));
if (rightGap)
result.uniteRight(logicalRightSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, this, curr->logicalRight(), curr->logicalTop(), curr->logicalHeight(), cache, paintInfo));
// Update lastLogicalTop to be just underneath the object. lastLogicalLeft and lastLogicalRight extend as far as
// they can without bumping into floating or positioned objects. Ideally they will go right up
// to the border of the root selection block.
lastLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + curr->logicalBottom();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, curr->logicalBottom(), cache);
lastLogicalRight = logicalRightSelectionOffset(rootBlock, curr->logicalBottom(), cache);
} else if (childState != SelectionNone) {
// We must be a block that has some selected object inside it. Go ahead and recur.
result.unite(toRenderBlock(curr)->selectionGaps(rootBlock, rootBlockPhysicalPosition, LayoutSize(offsetFromRootBlock.width() + curr->x(), offsetFromRootBlock.height() + curr->y()),
lastLogicalTop, lastLogicalLeft, lastLogicalRight, childCache, paintInfo));
}
}
return result;
}
LayoutRect RenderBlock::blockSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
LayoutUnit logicalTop = lastLogicalTop;
LayoutUnit logicalHeight = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalBottom - logicalTop;
if (logicalHeight <= 0)
return LayoutRect();
// Get the selection offsets for the bottom of the gap
LayoutUnit logicalLeft = max(lastLogicalLeft, logicalLeftSelectionOffset(rootBlock, logicalBottom, cache));
LayoutUnit logicalRight = min(lastLogicalRight, logicalRightSelectionOffset(rootBlock, logicalBottom, cache));
LayoutUnit logicalWidth = logicalRight - logicalLeft;
if (logicalWidth <= 0)
return LayoutRect();
LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, LayoutRect(logicalLeft, logicalTop, logicalWidth, logicalHeight));
if (paintInfo)
paintInfo->context->fillRect(pixelSnappedIntRect(gapRect), selectionBackgroundColor(), style()->colorSpace());
return gapRect;
}
LayoutRect RenderBlock::logicalLeftSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
LayoutUnit rootBlockLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalTop;
LayoutUnit rootBlockLogicalLeft = max(logicalLeftSelectionOffset(rootBlock, logicalTop, cache), logicalLeftSelectionOffset(rootBlock, logicalTop + logicalHeight, cache));
LayoutUnit rootBlockLogicalRight = min(inlineDirectionOffset(rootBlock, offsetFromRootBlock) + floorToInt(logicalLeft),
min(logicalRightSelectionOffset(rootBlock, logicalTop, cache), logicalRightSelectionOffset(rootBlock, logicalTop + logicalHeight, cache)));
LayoutUnit rootBlockLogicalWidth = rootBlockLogicalRight - rootBlockLogicalLeft;
if (rootBlockLogicalWidth <= 0)
return LayoutRect();
LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, LayoutRect(rootBlockLogicalLeft, rootBlockLogicalTop, rootBlockLogicalWidth, logicalHeight));
if (paintInfo)
paintInfo->context->fillRect(pixelSnappedIntRect(gapRect), selObj->selectionBackgroundColor(), selObj->style()->colorSpace());
return gapRect;
}
LayoutRect RenderBlock::logicalRightSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
LayoutUnit rootBlockLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalTop;
LayoutUnit rootBlockLogicalLeft = max(inlineDirectionOffset(rootBlock, offsetFromRootBlock) + floorToInt(logicalRight),
max(logicalLeftSelectionOffset(rootBlock, logicalTop, cache), logicalLeftSelectionOffset(rootBlock, logicalTop + logicalHeight, cache)));
LayoutUnit rootBlockLogicalRight = min(logicalRightSelectionOffset(rootBlock, logicalTop, cache), logicalRightSelectionOffset(rootBlock, logicalTop + logicalHeight, cache));
LayoutUnit rootBlockLogicalWidth = rootBlockLogicalRight - rootBlockLogicalLeft;
if (rootBlockLogicalWidth <= 0)
return LayoutRect();
LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, LayoutRect(rootBlockLogicalLeft, rootBlockLogicalTop, rootBlockLogicalWidth, logicalHeight));
if (paintInfo)
paintInfo->context->fillRect(pixelSnappedIntRect(gapRect), selObj->selectionBackgroundColor(), selObj->style()->colorSpace());
return gapRect;
}
void RenderBlock::getSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap)
{
bool ltr = style()->isLeftToRightDirection();
leftGap = (state == RenderObject::SelectionInside) ||
(state == RenderObject::SelectionEnd && ltr) ||
(state == RenderObject::SelectionStart && !ltr);
rightGap = (state == RenderObject::SelectionInside) ||
(state == RenderObject::SelectionStart && ltr) ||
(state == RenderObject::SelectionEnd && !ltr);
}
LayoutUnit RenderBlock::logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position, const LogicalSelectionOffsetCaches& cache)
{
LayoutUnit logicalLeft = logicalLeftOffsetForLine(position, false);
if (logicalLeft == logicalLeftOffsetForContent()) {
if (rootBlock != this) // The border can potentially be further extended by our containingBlock().
return cache.containingBlockInfo(this).logicalLeftSelectionOffset(rootBlock, position + logicalTop());
return logicalLeft;
} else {
RenderBlock* cb = this;
const LogicalSelectionOffsetCaches* currentCache = &cache;
while (cb != rootBlock) {
logicalLeft += cb->logicalLeft();
ASSERT(currentCache);
const LogicalSelectionOffsetCaches::ContainingBlockInfo& info = currentCache->containingBlockInfo(cb);
cb = info.block();
currentCache = info.cache();
}
}
return logicalLeft;
}
LayoutUnit RenderBlock::logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position, const LogicalSelectionOffsetCaches& cache)
{
LayoutUnit logicalRight = logicalRightOffsetForLine(position, false);
if (logicalRight == logicalRightOffsetForContent()) {
if (rootBlock != this) // The border can potentially be further extended by our containingBlock().
return cache.containingBlockInfo(this).logicalRightSelectionOffset(rootBlock, position + logicalTop());
return logicalRight;
} else {
RenderBlock* cb = this;
const LogicalSelectionOffsetCaches* currentCache = &cache;
while (cb != rootBlock) {
logicalRight += cb->logicalLeft();
ASSERT(currentCache);
const LogicalSelectionOffsetCaches::ContainingBlockInfo& info = currentCache->containingBlockInfo(cb);
cb = info.block();
currentCache = info.cache();
}
}
return logicalRight;
}
RenderBlock* RenderBlock::blockBeforeWithinSelectionRoot(LayoutSize& offset) const
{
if (isSelectionRoot())
return 0;
const RenderObject* object = this;
RenderObject* sibling;
do {
sibling = object->previousSibling();
while (sibling && (!sibling->isRenderBlock() || toRenderBlock(sibling)->isSelectionRoot()))
sibling = sibling->previousSibling();
offset -= LayoutSize(toRenderBlock(object)->logicalLeft(), toRenderBlock(object)->logicalTop());
object = object->parent();
} while (!sibling && object && object->isRenderBlock() && !toRenderBlock(object)->isSelectionRoot());
if (!sibling)
return 0;
RenderBlock* beforeBlock = toRenderBlock(sibling);
offset += LayoutSize(beforeBlock->logicalLeft(), beforeBlock->logicalTop());
RenderObject* child = beforeBlock->lastChild();
while (child && child->isRenderBlock()) {
beforeBlock = toRenderBlock(child);
offset += LayoutSize(beforeBlock->logicalLeft(), beforeBlock->logicalTop());
child = beforeBlock->lastChild();
}
return beforeBlock;
}
void RenderBlock::insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*& descendantsMap, TrackedContainerMap*& containerMap)
{
if (!descendantsMap) {
descendantsMap = new TrackedDescendantsMap;
containerMap = new TrackedContainerMap;
}
TrackedRendererListHashSet* descendantSet = descendantsMap->get(this);
if (!descendantSet) {
descendantSet = new TrackedRendererListHashSet;
descendantsMap->set(this, adoptPtr(descendantSet));
}
bool added = descendantSet->add(descendant).isNewEntry;
if (!added) {
ASSERT(containerMap->get(descendant));
ASSERT(containerMap->get(descendant)->contains(this));
return;
}
HashSet<RenderBlock*>* containerSet = containerMap->get(descendant);
if (!containerSet) {
containerSet = new HashSet<RenderBlock*>;
containerMap->set(descendant, adoptPtr(containerSet));
}
ASSERT(!containerSet->contains(this));
containerSet->add(this);
}
void RenderBlock::removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*& descendantsMap, TrackedContainerMap*& containerMap)
{
if (!descendantsMap)
return;
OwnPtr<HashSet<RenderBlock*> > containerSet = containerMap->take(descendant);
if (!containerSet)
return;
HashSet<RenderBlock*>::iterator end = containerSet->end();
for (HashSet<RenderBlock*>::iterator it = containerSet->begin(); it != end; ++it) {
RenderBlock* container = *it;
// FIXME: Disabling this assert temporarily until we fix the layout
// bugs associated with positioned objects not properly cleared from
// their ancestor chain before being moved. See webkit bug 93766.
// ASSERT(descendant->isDescendantOf(container));
TrackedDescendantsMap::iterator descendantsMapIterator = descendantsMap->find(container);
ASSERT(descendantsMapIterator != descendantsMap->end());
if (descendantsMapIterator == descendantsMap->end())
continue;
TrackedRendererListHashSet* descendantSet = descendantsMapIterator->value.get();
ASSERT(descendantSet->contains(descendant));
descendantSet->remove(descendant);
if (descendantSet->isEmpty())
descendantsMap->remove(descendantsMapIterator);
}
}
TrackedRendererListHashSet* RenderBlock::positionedObjects() const
{
if (gPositionedDescendantsMap)
return gPositionedDescendantsMap->get(this);
return 0;
}
void RenderBlock::insertPositionedObject(RenderBox* o)
{
ASSERT(!isAnonymousBlock());
if (o->isRenderFlowThread())
return;
insertIntoTrackedRendererMaps(o, gPositionedDescendantsMap, gPositionedContainerMap);
}
void RenderBlock::removePositionedObject(RenderBox* o)
{
removeFromTrackedRendererMaps(o, gPositionedDescendantsMap, gPositionedContainerMap);
}
void RenderBlock::removePositionedObjects(RenderBlock* o, ContainingBlockState containingBlockState)
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
RenderBox* r;
TrackedRendererListHashSet::iterator end = positionedDescendants->end();
Vector<RenderBox*, 16> deadObjects;
for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
r = *it;
if (!o || r->isDescendantOf(o)) {
if (containingBlockState == NewContainingBlock)
r->setChildNeedsLayout(true, MarkOnlyThis);
// It is parent blocks job to add positioned child to positioned objects list of its containing block
// Parent layout needs to be invalidated to ensure this happens.
RenderObject* p = r->parent();
while (p && !p->isRenderBlock())
p = p->parent();
if (p)
p->setChildNeedsLayout(true);
deadObjects.append(r);
}
}
for (unsigned i = 0; i < deadObjects.size(); i++)
removePositionedObject(deadObjects.at(i));
}
void RenderBlock::removeFloatingObjects()
{
if (!m_floatingObjects)
return;
deleteAllValues(m_floatingObjects->set());
m_floatingObjects->clear();
}
RenderBlock::FloatingObject* RenderBlock::insertFloatingObject(RenderBox* o)
{
ASSERT(o->isFloating());
// Create the list of special objects if we don't aleady have one
if (!m_floatingObjects)
createFloatingObjects();
else {
// Don't insert the object again if it's already in the list
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator it = floatingObjectSet.find<RenderBox*, FloatingObjectHashTranslator>(o);
if (it != floatingObjectSet.end())
return *it;
}
// Create the special object entry & append it to the list
FloatingObject* newObj = new FloatingObject(o->style()->floating());
// Our location is irrelevant if we're unsplittable or no pagination is in effect.
// Just go ahead and lay out the float.
bool isChildRenderBlock = o->isRenderBlock();
if (isChildRenderBlock && !o->needsLayout() && view()->layoutState()->pageLogicalHeightChanged())
o->setChildNeedsLayout(true, MarkOnlyThis);
bool needsBlockDirectionLocationSetBeforeLayout = isChildRenderBlock && view()->layoutState()->needsBlockDirectionLocationSetBeforeLayout();
if (!needsBlockDirectionLocationSetBeforeLayout || isWritingModeRoot()) // We are unsplittable if we're a block flow root.
o->layoutIfNeeded();
else {
o->updateLogicalWidth();
o->computeAndSetBlockDirectionMargins(this);
}
#if ENABLE(CSS_SHAPES)
ExclusionShapeOutsideInfo* shapeOutside = o->exclusionShapeOutsideInfo();
if (shapeOutside) {
shapeOutside->setShapeSize(o->logicalWidth(), o->logicalHeight());
// The CSS Exclusions specification says that the margins are ignored
// when a float has a shape outside.
setLogicalWidthForFloat(newObj, shapeOutside->shapeLogicalWidth());
} else
#endif
setLogicalWidthForFloat(newObj, logicalWidthForChild(o) + marginStartForChild(o) + marginEndForChild(o));
newObj->setShouldPaint(!o->hasSelfPaintingLayer()); // If a layer exists, the float will paint itself. Otherwise someone else will.
newObj->setIsDescendant(true);
newObj->m_renderer = o;
m_floatingObjects->add(newObj);
return newObj;
}
void RenderBlock::removeFloatingObject(RenderBox* o)
{
if (m_floatingObjects) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator it = floatingObjectSet.find<RenderBox*, FloatingObjectHashTranslator>(o);
if (it != floatingObjectSet.end()) {
FloatingObject* r = *it;
if (childrenInline()) {
LayoutUnit logicalTop = logicalTopForFloat(r);
LayoutUnit logicalBottom = logicalBottomForFloat(r);
// Fix for https://bugs.webkit.org/show_bug.cgi?id=54995.
if (logicalBottom < 0 || logicalBottom < logicalTop || logicalTop == LayoutUnit::max())
logicalBottom = LayoutUnit::max();
else {
// Special-case zero- and less-than-zero-height floats: those don't touch
// the line that they're on, but it still needs to be dirtied. This is
// accomplished by pretending they have a height of 1.
logicalBottom = max(logicalBottom, logicalTop + 1);
}
if (r->m_originatingLine) {
if (!selfNeedsLayout()) {
ASSERT(r->m_originatingLine->renderer() == this);
r->m_originatingLine->markDirty();
}
#if !ASSERT_DISABLED
r->m_originatingLine = 0;
#endif
}
markLinesDirtyInBlockRange(0, logicalBottom);
}
m_floatingObjects->remove(r);
ASSERT(!r->m_originatingLine);
delete r;
}
}
}
void RenderBlock::removeFloatingObjectsBelow(FloatingObject* lastFloat, int logicalOffset)
{
if (!containsFloats())
return;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObject* curr = floatingObjectSet.last();
while (curr != lastFloat && (!curr->isPlaced() || logicalTopForFloat(curr) >= logicalOffset)) {
m_floatingObjects->remove(curr);
ASSERT(!curr->m_originatingLine);
delete curr;
if (floatingObjectSet.isEmpty())
break;
curr = floatingObjectSet.last();
}
}
LayoutPoint RenderBlock::computeLogicalLocationForFloat(const FloatingObject* floatingObject, LayoutUnit logicalTopOffset) const
{
RenderBox* childBox = floatingObject->renderer();
LayoutUnit logicalLeftOffset = logicalLeftOffsetForContent(logicalTopOffset); // Constant part of left offset.
LayoutUnit logicalRightOffset; // Constant part of right offset.
#if ENABLE(CSS_SHAPES)
// FIXME Bug 102948: This only works for shape outside directly set on this block.
ExclusionShapeInsideInfo* shapeInsideInfo = exclusionShapeInsideInfo();
// FIXME Bug 102846: Take into account the height of the content. The offset should be
// equal to the maximum segment length.
if (shapeInsideInfo && shapeInsideInfo->hasSegments() && shapeInsideInfo->segments().size() == 1) {
// FIXME Bug 102949: Add support for shapes with multipe segments.
// The segment offsets are relative to the content box.
logicalRightOffset = logicalLeftOffset + shapeInsideInfo->segments()[0].logicalRight;
logicalLeftOffset += shapeInsideInfo->segments()[0].logicalLeft;
} else
#endif
logicalRightOffset = logicalRightOffsetForContent(logicalTopOffset);
LayoutUnit floatLogicalWidth = min(logicalWidthForFloat(floatingObject), logicalRightOffset - logicalLeftOffset); // The width we look for.
LayoutUnit floatLogicalLeft;
bool insideFlowThread = flowThreadContainingBlock();
if (childBox->style()->floating() == LeftFloat) {
LayoutUnit heightRemainingLeft = 1;
LayoutUnit heightRemainingRight = 1;
floatLogicalLeft = logicalLeftOffsetForLine(logicalTopOffset, logicalLeftOffset, false, &heightRemainingLeft, 0, ShapeOutsideFloatBoundingBoxOffset);
while (logicalRightOffsetForLine(logicalTopOffset, logicalRightOffset, false, &heightRemainingRight, 0, ShapeOutsideFloatBoundingBoxOffset) - floatLogicalLeft < floatLogicalWidth) {
logicalTopOffset += min(heightRemainingLeft, heightRemainingRight);
floatLogicalLeft = logicalLeftOffsetForLine(logicalTopOffset, logicalLeftOffset, false, &heightRemainingLeft, 0, ShapeOutsideFloatBoundingBoxOffset);
if (insideFlowThread) {
// Have to re-evaluate all of our offsets, since they may have changed.
logicalRightOffset = logicalRightOffsetForContent(logicalTopOffset); // Constant part of right offset.
logicalLeftOffset = logicalLeftOffsetForContent(logicalTopOffset); // Constant part of left offset.
floatLogicalWidth = min(logicalWidthForFloat(floatingObject), logicalRightOffset - logicalLeftOffset);
}
}
floatLogicalLeft = max(logicalLeftOffset - borderAndPaddingLogicalLeft(), floatLogicalLeft);
} else {
LayoutUnit heightRemainingLeft = 1;
LayoutUnit heightRemainingRight = 1;
floatLogicalLeft = logicalRightOffsetForLine(logicalTopOffset, logicalRightOffset, false, &heightRemainingRight, 0, ShapeOutsideFloatBoundingBoxOffset);
while (floatLogicalLeft - logicalLeftOffsetForLine(logicalTopOffset, logicalLeftOffset, false, &heightRemainingLeft, 0, ShapeOutsideFloatBoundingBoxOffset) < floatLogicalWidth) {
logicalTopOffset += min(heightRemainingLeft, heightRemainingRight);
floatLogicalLeft = logicalRightOffsetForLine(logicalTopOffset, logicalRightOffset, false, &heightRemainingRight, 0, ShapeOutsideFloatBoundingBoxOffset);
if (insideFlowThread) {
// Have to re-evaluate all of our offsets, since they may have changed.
logicalRightOffset = logicalRightOffsetForContent(logicalTopOffset); // Constant part of right offset.
logicalLeftOffset = logicalLeftOffsetForContent(logicalTopOffset); // Constant part of left offset.
floatLogicalWidth = min(logicalWidthForFloat(floatingObject), logicalRightOffset - logicalLeftOffset);
}
}
floatLogicalLeft -= logicalWidthForFloat(floatingObject); // Use the original width of the float here, since the local variable
// |floatLogicalWidth| was capped to the available line width.
// See fast/block/float/clamped-right-float.html.
}
return LayoutPoint(floatLogicalLeft, logicalTopOffset);
}
bool RenderBlock::positionNewFloats()
{
if (!m_floatingObjects)
return false;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
if (floatingObjectSet.isEmpty())
return false;
// If all floats have already been positioned, then we have no work to do.
if (floatingObjectSet.last()->isPlaced())
return false;
// Move backwards through our floating object list until we find a float that has
// already been positioned. Then we'll be able to move forward, positioning all of
// the new floats that need it.
FloatingObjectSetIterator it = floatingObjectSet.end();
--it; // Go to last item.
FloatingObjectSetIterator begin = floatingObjectSet.begin();
FloatingObject* lastPlacedFloatingObject = 0;
while (it != begin) {
--it;
if ((*it)->isPlaced()) {
lastPlacedFloatingObject = *it;
++it;
break;
}
}
LayoutUnit logicalTop = logicalHeight();
// The float cannot start above the top position of the last positioned float.
if (lastPlacedFloatingObject)
logicalTop = max(logicalTopForFloat(lastPlacedFloatingObject), logicalTop);
FloatingObjectSetIterator end = floatingObjectSet.end();
// Now walk through the set of unpositioned floats and place them.
for (; it != end; ++it) {
FloatingObject* floatingObject = *it;
// The containing block is responsible for positioning floats, so if we have floats in our
// list that come from somewhere else, do not attempt to position them.
if (floatingObject->renderer()->containingBlock() != this)
continue;
RenderBox* childBox = floatingObject->renderer();
LayoutUnit childLogicalLeftMargin = style()->isLeftToRightDirection() ? marginStartForChild(childBox) : marginEndForChild(childBox);
LayoutRect oldRect = childBox->frameRect();
if (childBox->style()->clear() & CLEFT)
logicalTop = max(lowestFloatLogicalBottom(FloatingObject::FloatLeft), logicalTop);
if (childBox->style()->clear() & CRIGHT)
logicalTop = max(lowestFloatLogicalBottom(FloatingObject::FloatRight), logicalTop);
LayoutPoint floatLogicalLocation = computeLogicalLocationForFloat(floatingObject, logicalTop);
setLogicalLeftForFloat(floatingObject, floatLogicalLocation.x());
setLogicalLeftForChild(childBox, floatLogicalLocation.x() + childLogicalLeftMargin);
setLogicalTopForChild(childBox, floatLogicalLocation.y() + marginBeforeForChild(childBox));
LayoutState* layoutState = view()->layoutState();
bool isPaginated = layoutState->isPaginated();
if (isPaginated && !childBox->needsLayout())
childBox->markForPaginationRelayoutIfNeeded();
childBox->layoutIfNeeded();
if (isPaginated) {
// If we are unsplittable and don't fit, then we need to move down.
// We include our margins as part of the unsplittable area.
LayoutUnit newLogicalTop = adjustForUnsplittableChild(childBox, floatLogicalLocation.y(), true);
// See if we have a pagination strut that is making us move down further.
// Note that an unsplittable child can't also have a pagination strut, so this is
// exclusive with the case above.
RenderBlock* childBlock = childBox->isRenderBlock() ? toRenderBlock(childBox) : 0;
if (childBlock && childBlock->paginationStrut()) {
newLogicalTop += childBlock->paginationStrut();
childBlock->setPaginationStrut(0);
}
if (newLogicalTop != floatLogicalLocation.y()) {
floatingObject->m_paginationStrut = newLogicalTop - floatLogicalLocation.y();
floatLogicalLocation = computeLogicalLocationForFloat(floatingObject, newLogicalTop);
setLogicalLeftForFloat(floatingObject, floatLogicalLocation.x());
setLogicalLeftForChild(childBox, floatLogicalLocation.x() + childLogicalLeftMargin);
setLogicalTopForChild(childBox, floatLogicalLocation.y() + marginBeforeForChild(childBox));
if (childBlock)
childBlock->setChildNeedsLayout(true, MarkOnlyThis);
childBox->layoutIfNeeded();
}
}
setLogicalTopForFloat(floatingObject, floatLogicalLocation.y());
#if ENABLE(CSS_SHAPES)
if (childBox->exclusionShapeOutsideInfo())
setLogicalHeightForFloat(floatingObject, childBox->exclusionShapeOutsideInfo()->shapeLogicalHeight());
else
#endif
setLogicalHeightForFloat(floatingObject, logicalHeightForChild(childBox) + marginBeforeForChild(childBox) + marginAfterForChild(childBox));
m_floatingObjects->addPlacedObject(floatingObject);
// If the child moved, we have to repaint it.
if (childBox->checkForRepaintDuringLayout())
childBox->repaintDuringLayoutIfMoved(oldRect);
}
return true;
}
void RenderBlock::newLine(EClear clear)
{
positionNewFloats();
// set y position
LayoutUnit newY = 0;
switch (clear)
{
case CLEFT:
newY = lowestFloatLogicalBottom(FloatingObject::FloatLeft);
break;
case CRIGHT:
newY = lowestFloatLogicalBottom(FloatingObject::FloatRight);
break;
case CBOTH:
newY = lowestFloatLogicalBottom();
default:
break;
}
if (height() < newY)
setLogicalHeight(newY);
}
void RenderBlock::addPercentHeightDescendant(RenderBox* descendant)
{
insertIntoTrackedRendererMaps(descendant, gPercentHeightDescendantsMap, gPercentHeightContainerMap);
}
void RenderBlock::removePercentHeightDescendant(RenderBox* descendant)
{
removeFromTrackedRendererMaps(descendant, gPercentHeightDescendantsMap, gPercentHeightContainerMap);
}
TrackedRendererListHashSet* RenderBlock::percentHeightDescendants() const
{
return gPercentHeightDescendantsMap ? gPercentHeightDescendantsMap->get(this) : 0;
}
bool RenderBlock::hasPercentHeightContainerMap()
{
return gPercentHeightContainerMap;
}
bool RenderBlock::hasPercentHeightDescendant(RenderBox* descendant)
{
// We don't null check gPercentHeightContainerMap since the caller
// already ensures this and we need to call this function on every
// descendant in clearPercentHeightDescendantsFrom().
ASSERT(gPercentHeightContainerMap);
return gPercentHeightContainerMap->contains(descendant);
}
void RenderBlock::removePercentHeightDescendantIfNeeded(RenderBox* descendant)
{
// We query the map directly, rather than looking at style's
// logicalHeight()/logicalMinHeight()/logicalMaxHeight() since those
// can change with writing mode/directional changes.
if (!hasPercentHeightContainerMap())
return;
if (!hasPercentHeightDescendant(descendant))
return;
removePercentHeightDescendant(descendant);
}
void RenderBlock::clearPercentHeightDescendantsFrom(RenderBox* parent)
{
ASSERT(gPercentHeightContainerMap);
for (RenderObject* curr = parent->firstChild(); curr; curr = curr->nextInPreOrder(parent)) {
if (!curr->isBox())
continue;
RenderBox* box = toRenderBox(curr);
if (!hasPercentHeightDescendant(box))
continue;
removePercentHeightDescendant(box);
}
}
static bool rangesIntersect(int floatTop, int floatBottom, int objectTop, int objectBottom)
{
if (objectTop >= floatBottom || objectBottom < floatTop)
return false;
// The top of the object overlaps the float
if (objectTop >= floatTop)
return true;
// The object encloses the float
if (objectTop < floatTop && objectBottom > floatBottom)
return true;
// The bottom of the object overlaps the float
if (objectBottom > objectTop && objectBottom > floatTop && objectBottom <= floatBottom)
return true;
return false;
}
template <RenderBlock::FloatingObject::Type FloatTypeValue>
inline void RenderBlock::FloatIntervalSearchAdapter<FloatTypeValue>::collectIfNeeded(const IntervalType& interval) const
{
const FloatingObject* r = interval.data();
if (r->type() != FloatTypeValue || !rangesIntersect(interval.low(), interval.high(), m_lowValue, m_highValue))
return;
// All the objects returned from the tree should be already placed.
ASSERT(r->isPlaced() && rangesIntersect(m_renderer->logicalTopForFloat(r), m_renderer->logicalBottomForFloat(r), m_lowValue, m_highValue));
if (FloatTypeValue == FloatingObject::FloatLeft
&& m_renderer->logicalRightForFloat(r) > m_offset) {
m_offset = m_renderer->logicalRightForFloat(r);
if (m_heightRemaining)
*m_heightRemaining = m_renderer->logicalBottomForFloat(r) - m_lowValue;
}
if (FloatTypeValue == FloatingObject::FloatRight
&& m_renderer->logicalLeftForFloat(r) < m_offset) {
m_offset = m_renderer->logicalLeftForFloat(r);
if (m_heightRemaining)
*m_heightRemaining = m_renderer->logicalBottomForFloat(r) - m_lowValue;
}
#if ENABLE(CSS_SHAPES)
m_last = r;
#endif
}
LayoutUnit RenderBlock::textIndentOffset() const
{
LayoutUnit cw = 0;
RenderView* renderView = 0;
if (style()->textIndent().isPercent())
cw = containingBlock()->availableLogicalWidth();
else if (style()->textIndent().isViewportPercentage())
renderView = view();
return minimumValueForLength(style()->textIndent(), cw, renderView);
}
LayoutUnit RenderBlock::logicalLeftOffsetForContent(RenderRegion* region) const
{
LayoutUnit logicalLeftOffset = style()->isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop();
if (!region)
return logicalLeftOffset;
LayoutRect boxRect = borderBoxRectInRegion(region);
return logicalLeftOffset + (isHorizontalWritingMode() ? boxRect.x() : boxRect.y());
}
LayoutUnit RenderBlock::logicalRightOffsetForContent(RenderRegion* region) const
{
LayoutUnit logicalRightOffset = style()->isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop();
logicalRightOffset += availableLogicalWidth();
if (!region)
return logicalRightOffset;
LayoutRect boxRect = borderBoxRectInRegion(region);
return logicalRightOffset - (logicalWidth() - (isHorizontalWritingMode() ? boxRect.maxX() : boxRect.maxY()));
}
LayoutUnit RenderBlock::logicalLeftOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining, LayoutUnit logicalHeight, ShapeOutsideFloatOffsetMode offsetMode) const
{
LayoutUnit left = fixedOffset;
if (m_floatingObjects && m_floatingObjects->hasLeftObjects()) {
if (heightRemaining)
*heightRemaining = 1;
FloatIntervalSearchAdapter<FloatingObject::FloatLeft> adapter(this, roundToInt(logicalTop), roundToInt(logicalTop + logicalHeight), left, heightRemaining);
m_floatingObjects->placedFloatsTree().allOverlapsWithAdapter(adapter);
#if ENABLE(CSS_SHAPES)
const FloatingObject* lastFloat = adapter.lastFloat();
if (offsetMode == ShapeOutsideFloatShapeOffset && lastFloat) {
if (ExclusionShapeOutsideInfo* shapeOutside = lastFloat->renderer()->exclusionShapeOutsideInfo()) {
shapeOutside->computeSegmentsForLine(logicalTop - logicalTopForFloat(lastFloat) + shapeOutside->shapeLogicalTop(), logicalHeight);
left += shapeOutside->rightSegmentShapeBoundingBoxDelta();
}
}
#endif
}
if (applyTextIndent && style()->isLeftToRightDirection())
left += textIndentOffset();
if (style()->lineAlign() == LineAlignNone)
return left;
// Push in our left offset so that it is aligned with the character grid.
LayoutState* layoutState = view()->layoutState();
if (!layoutState)
return left;
RenderBlock* lineGrid = layoutState->lineGrid();
if (!lineGrid || lineGrid->style()->writingMode() != style()->writingMode())
return left;
// FIXME: Should letter-spacing apply? This is complicated since it doesn't apply at the edge?
float maxCharWidth = lineGrid->style()->font().primaryFont()->maxCharWidth();
if (!maxCharWidth)
return left;
LayoutUnit lineGridOffset = lineGrid->isHorizontalWritingMode() ? layoutState->lineGridOffset().width(): layoutState->lineGridOffset().height();
LayoutUnit layoutOffset = lineGrid->isHorizontalWritingMode() ? layoutState->layoutOffset().width() : layoutState->layoutOffset().height();
// Push in to the nearest character width (truncated so that we pixel snap left).
// FIXME: Should be patched when subpixel layout lands, since this calculation doesn't have to pixel snap
// any more (https://bugs.webkit.org/show_bug.cgi?id=79946).
// FIXME: This is wrong for RTL (https://bugs.webkit.org/show_bug.cgi?id=79945).
// FIXME: This doesn't work with columns or regions (https://bugs.webkit.org/show_bug.cgi?id=79942).
// FIXME: This doesn't work when the inline position of the object isn't set ahead of time.
// FIXME: Dynamic changes to the font or to the inline position need to result in a deep relayout.
// (https://bugs.webkit.org/show_bug.cgi?id=79944)
float remainder = fmodf(maxCharWidth - fmodf(left + layoutOffset - lineGridOffset, maxCharWidth), maxCharWidth);
left += remainder;
return left;
}
LayoutUnit RenderBlock::logicalRightOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining, LayoutUnit logicalHeight, ShapeOutsideFloatOffsetMode offsetMode) const
{
LayoutUnit right = fixedOffset;
if (m_floatingObjects && m_floatingObjects->hasRightObjects()) {
if (heightRemaining)
*heightRemaining = 1;
LayoutUnit rightFloatOffset = fixedOffset;
FloatIntervalSearchAdapter<FloatingObject::FloatRight> adapter(this, roundToInt(logicalTop), roundToInt(logicalTop + logicalHeight), rightFloatOffset, heightRemaining);
m_floatingObjects->placedFloatsTree().allOverlapsWithAdapter(adapter);
#if ENABLE(CSS_SHAPES)
const FloatingObject* lastFloat = adapter.lastFloat();
if (offsetMode == ShapeOutsideFloatShapeOffset && lastFloat) {
if (ExclusionShapeOutsideInfo* shapeOutside = lastFloat->renderer()->exclusionShapeOutsideInfo()) {
shapeOutside->computeSegmentsForLine(logicalTop - logicalTopForFloat(lastFloat) + shapeOutside->shapeLogicalTop(), logicalHeight);
rightFloatOffset += shapeOutside->leftSegmentShapeBoundingBoxDelta();
}
}
#endif
right = min(right, rightFloatOffset);
}
if (applyTextIndent && !style()->isLeftToRightDirection())
right -= textIndentOffset();
if (style()->lineAlign() == LineAlignNone)
return right;
// Push in our right offset so that it is aligned with the character grid.
LayoutState* layoutState = view()->layoutState();
if (!layoutState)
return right;
RenderBlock* lineGrid = layoutState->lineGrid();
if (!lineGrid || lineGrid->style()->writingMode() != style()->writingMode())
return right;
// FIXME: Should letter-spacing apply? This is complicated since it doesn't apply at the edge?
float maxCharWidth = lineGrid->style()->font().primaryFont()->maxCharWidth();
if (!maxCharWidth)
return right;
LayoutUnit lineGridOffset = lineGrid->isHorizontalWritingMode() ? layoutState->lineGridOffset().width(): layoutState->lineGridOffset().height();
LayoutUnit layoutOffset = lineGrid->isHorizontalWritingMode() ? layoutState->layoutOffset().width() : layoutState->layoutOffset().height();
// Push in to the nearest character width (truncated so that we pixel snap right).
// FIXME: Should be patched when subpixel layout lands, since this calculation doesn't have to pixel snap
// any more (https://bugs.webkit.org/show_bug.cgi?id=79946).
// FIXME: This is wrong for RTL (https://bugs.webkit.org/show_bug.cgi?id=79945).
// FIXME: This doesn't work with columns or regions (https://bugs.webkit.org/show_bug.cgi?id=79942).
// FIXME: This doesn't work when the inline position of the object isn't set ahead of time.
// FIXME: Dynamic changes to the font or to the inline position need to result in a deep relayout.
// (https://bugs.webkit.org/show_bug.cgi?id=79944)
float remainder = fmodf(fmodf(right + layoutOffset - lineGridOffset, maxCharWidth), maxCharWidth);
right -= ceilf(remainder);
return right;
}
LayoutUnit RenderBlock::nextFloatLogicalBottomBelow(LayoutUnit logicalHeight) const
{
if (!m_floatingObjects)
return logicalHeight;
LayoutUnit bottom = LayoutUnit::max();
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
LayoutUnit floatBottom = logicalBottomForFloat(r);
if (floatBottom > logicalHeight)
bottom = min(floatBottom, bottom);
}
return bottom == LayoutUnit::max() ? LayoutUnit() : bottom;
}
LayoutUnit RenderBlock::lowestFloatLogicalBottom(FloatingObject::Type floatType) const
{
if (!m_floatingObjects)
return 0;
LayoutUnit lowestFloatBottom = 0;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
if (r->isPlaced() && r->type() & floatType)
lowestFloatBottom = max(lowestFloatBottom, logicalBottomForFloat(r));
}
return lowestFloatBottom;
}
void RenderBlock::markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest)
{
if (logicalTop >= logicalBottom)
return;
RootInlineBox* lowestDirtyLine = lastRootBox();
RootInlineBox* afterLowest = lowestDirtyLine;
while (lowestDirtyLine && lowestDirtyLine->lineBottomWithLeading() >= logicalBottom && logicalBottom < LayoutUnit::max()) {
afterLowest = lowestDirtyLine;
lowestDirtyLine = lowestDirtyLine->prevRootBox();
}
while (afterLowest && afterLowest != highest && (afterLowest->lineBottomWithLeading() >= logicalTop || afterLowest->lineBottomWithLeading() < 0)) {
afterLowest->markDirty();
afterLowest = afterLowest->prevRootBox();
}
}
void RenderBlock::clearFloats()
{
if (m_floatingObjects)
m_floatingObjects->setHorizontalWritingMode(isHorizontalWritingMode());
HashSet<RenderBox*> oldIntrudingFloatSet;
if (!childrenInline() && m_floatingObjects) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* floatingObject = *it;
if (!floatingObject->isDescendant())
oldIntrudingFloatSet.add(floatingObject->m_renderer);
}
}
// Inline blocks are covered by the isReplaced() check in the avoidFloats method.
if (avoidsFloats() || isRoot() || isRenderView() || isFloatingOrOutOfFlowPositioned() || isTableCell()) {
if (m_floatingObjects) {
deleteAllValues(m_floatingObjects->set());
m_floatingObjects->clear();
}
if (!oldIntrudingFloatSet.isEmpty())
markAllDescendantsWithFloatsForLayout();
return;
}
typedef HashMap<RenderObject*, FloatingObject*> RendererToFloatInfoMap;
RendererToFloatInfoMap floatMap;
if (m_floatingObjects) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
if (childrenInline()) {
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* f = *it;
floatMap.add(f->m_renderer, f);
}
} else
deleteAllValues(floatingObjectSet);
m_floatingObjects->clear();
}
// We should not process floats if the parent node is not a RenderBlock. Otherwise, we will add
// floats in an invalid context. This will cause a crash arising from a bad cast on the parent.
// See <rdar://problem/8049753>, where float property is applied on a text node in a SVG.
if (!parent() || !parent()->isRenderBlock())
return;
// Attempt to locate a previous sibling with overhanging floats. We skip any elements that are
// out of flow (like floating/positioned elements), and we also skip over any objects that may have shifted
// to avoid floats.
RenderBlock* parentBlock = toRenderBlock(parent());
bool parentHasFloats = false;
RenderObject* prev = previousSibling();
while (prev && (prev->isFloatingOrOutOfFlowPositioned() || !prev->isBox() || !prev->isRenderBlock() || toRenderBlock(prev)->avoidsFloats())) {
if (prev->isFloating())
parentHasFloats = true;
prev = prev->previousSibling();
}
// First add in floats from the parent.
LayoutUnit logicalTopOffset = logicalTop();
if (parentHasFloats)
addIntrudingFloats(parentBlock, parentBlock->logicalLeftOffsetForContent(), logicalTopOffset);
LayoutUnit logicalLeftOffset = 0;
if (prev)
logicalTopOffset -= toRenderBox(prev)->logicalTop();
else {
prev = parentBlock;
logicalLeftOffset += parentBlock->logicalLeftOffsetForContent();
}
// Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space.
RenderBlock* block = toRenderBlock(prev);
if (block->m_floatingObjects && block->lowestFloatLogicalBottom() > logicalTopOffset)
addIntrudingFloats(block, logicalLeftOffset, logicalTopOffset);
if (childrenInline()) {
LayoutUnit changeLogicalTop = LayoutUnit::max();
LayoutUnit changeLogicalBottom = LayoutUnit::min();
if (m_floatingObjects) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* f = *it;
FloatingObject* oldFloatingObject = floatMap.get(f->m_renderer);
LayoutUnit logicalBottom = logicalBottomForFloat(f);
if (oldFloatingObject) {
LayoutUnit oldLogicalBottom = logicalBottomForFloat(oldFloatingObject);
if (logicalWidthForFloat(f) != logicalWidthForFloat(oldFloatingObject) || logicalLeftForFloat(f) != logicalLeftForFloat(oldFloatingObject)) {
changeLogicalTop = 0;
changeLogicalBottom = max(changeLogicalBottom, max(logicalBottom, oldLogicalBottom));
} else {
if (logicalBottom != oldLogicalBottom) {
changeLogicalTop = min(changeLogicalTop, min(logicalBottom, oldLogicalBottom));
changeLogicalBottom = max(changeLogicalBottom, max(logicalBottom, oldLogicalBottom));
}
LayoutUnit logicalTop = logicalTopForFloat(f);
LayoutUnit oldLogicalTop = logicalTopForFloat(oldFloatingObject);
if (logicalTop != oldLogicalTop) {
changeLogicalTop = min(changeLogicalTop, min(logicalTop, oldLogicalTop));
changeLogicalBottom = max(changeLogicalBottom, max(logicalTop, oldLogicalTop));
}
}
floatMap.remove(f->m_renderer);
if (oldFloatingObject->m_originatingLine && !selfNeedsLayout()) {
ASSERT(oldFloatingObject->m_originatingLine->renderer() == this);
oldFloatingObject->m_originatingLine->markDirty();
}
delete oldFloatingObject;
} else {
changeLogicalTop = 0;
changeLogicalBottom = max(changeLogicalBottom, logicalBottom);
}
}
}
RendererToFloatInfoMap::iterator end = floatMap.end();
for (RendererToFloatInfoMap::iterator it = floatMap.begin(); it != end; ++it) {
FloatingObject* floatingObject = (*it).value;
if (!floatingObject->isDescendant()) {
changeLogicalTop = 0;
changeLogicalBottom = max(changeLogicalBottom, logicalBottomForFloat(floatingObject));
}
}
deleteAllValues(floatMap);
markLinesDirtyInBlockRange(changeLogicalTop, changeLogicalBottom);
} else if (!oldIntrudingFloatSet.isEmpty()) {
// If there are previously intruding floats that no longer intrude, then children with floats
// should also get layout because they might need their floating object lists cleared.
if (m_floatingObjects->set().size() < oldIntrudingFloatSet.size())
markAllDescendantsWithFloatsForLayout();
else {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end && !oldIntrudingFloatSet.isEmpty(); ++it)
oldIntrudingFloatSet.remove((*it)->m_renderer);
if (!oldIntrudingFloatSet.isEmpty())
markAllDescendantsWithFloatsForLayout();
}
}
}
LayoutUnit RenderBlock::addOverhangingFloats(RenderBlock* child, bool makeChildPaintOtherFloats)
{
// Prevent floats from being added to the canvas by the root element, e.g., <html>.
if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot() || child->hasColumns() || child->isWritingModeRoot())
return 0;
LayoutUnit childLogicalTop = child->logicalTop();
LayoutUnit childLogicalLeft = child->logicalLeft();
LayoutUnit lowestFloatLogicalBottom = 0;
// Floats that will remain the child's responsibility to paint should factor into its
// overflow.
FloatingObjectSetIterator childEnd = child->m_floatingObjects->set().end();
for (FloatingObjectSetIterator childIt = child->m_floatingObjects->set().begin(); childIt != childEnd; ++childIt) {
FloatingObject* r = *childIt;
LayoutUnit logicalBottomForFloat = min(this->logicalBottomForFloat(r), LayoutUnit::max() - childLogicalTop);
LayoutUnit logicalBottom = childLogicalTop + logicalBottomForFloat;
lowestFloatLogicalBottom = max(lowestFloatLogicalBottom, logicalBottom);
if (logicalBottom > logicalHeight()) {
// If the object is not in the list, we add it now.
if (!containsFloat(r->m_renderer)) {
LayoutSize offset = isHorizontalWritingMode() ? LayoutSize(-childLogicalLeft, -childLogicalTop) : LayoutSize(-childLogicalTop, -childLogicalLeft);
FloatingObject* floatingObj = new FloatingObject(r->type(), LayoutRect(r->frameRect().location() - offset, r->frameRect().size()));
floatingObj->m_renderer = r->m_renderer;
// The nearest enclosing layer always paints the float (so that zindex and stacking
// behaves properly). We always want to propagate the desire to paint the float as
// far out as we can, to the outermost block that overlaps the float, stopping only
// if we hit a self-painting layer boundary.
if (r->m_renderer->enclosingFloatPaintingLayer() == enclosingFloatPaintingLayer())
r->setShouldPaint(false);
else
floatingObj->setShouldPaint(false);
floatingObj->setIsDescendant(true);
// We create the floating object list lazily.
if (!m_floatingObjects)
createFloatingObjects();
m_floatingObjects->add(floatingObj);
}
} else {
if (makeChildPaintOtherFloats && !r->shouldPaint() && !r->m_renderer->hasSelfPaintingLayer()
&& r->m_renderer->isDescendantOf(child) && r->m_renderer->enclosingFloatPaintingLayer() == child->enclosingFloatPaintingLayer()) {
// The float is not overhanging from this block, so if it is a descendant of the child, the child should
// paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing
// layer.
// If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats
// it should paint.
r->setShouldPaint(true);
}
// Since the float doesn't overhang, it didn't get put into our list. We need to go ahead and add its overflow in to the
// child now.
if (r->isDescendant())
child->addOverflowFromChild(r->m_renderer, LayoutSize(xPositionForFloatIncludingMargin(r), yPositionForFloatIncludingMargin(r)));
}
}
return lowestFloatLogicalBottom;
}
bool RenderBlock::hasOverhangingFloat(RenderBox* renderer)
{
if (!m_floatingObjects || hasColumns() || !parent())
return false;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator it = floatingObjectSet.find<RenderBox*, FloatingObjectHashTranslator>(renderer);
if (it == floatingObjectSet.end())
return false;
return logicalBottomForFloat(*it) > logicalHeight();
}
void RenderBlock::addIntrudingFloats(RenderBlock* prev, LayoutUnit logicalLeftOffset, LayoutUnit logicalTopOffset)
{
ASSERT(!avoidsFloats());
// If the parent or previous sibling doesn't have any floats to add, don't bother.
if (!prev->m_floatingObjects)
return;
logicalLeftOffset += marginLogicalLeft();
const FloatingObjectSet& prevSet = prev->m_floatingObjects->set();
FloatingObjectSetIterator prevEnd = prevSet.end();
for (FloatingObjectSetIterator prevIt = prevSet.begin(); prevIt != prevEnd; ++prevIt) {
FloatingObject* r = *prevIt;
if (logicalBottomForFloat(r) > logicalTopOffset) {
if (!m_floatingObjects || !m_floatingObjects->set().contains(r)) {
LayoutSize offset = isHorizontalWritingMode() ? LayoutSize(logicalLeftOffset, logicalTopOffset) : LayoutSize(logicalTopOffset, logicalLeftOffset);
FloatingObject* floatingObj = new FloatingObject(r->type(), LayoutRect(r->frameRect().location() - offset, r->frameRect().size()));
// Applying the child's margin makes no sense in the case where the child was passed in.
// since this margin was added already through the modification of the |logicalLeftOffset| variable
// above. |logicalLeftOffset| will equal the margin in this case, so it's already been taken
// into account. Only apply this code if prev is the parent, since otherwise the left margin
// will get applied twice.
if (prev != parent()) {
if (isHorizontalWritingMode())
floatingObj->setX(floatingObj->x() + prev->marginLeft());
else
floatingObj->setY(floatingObj->y() + prev->marginTop());
}
floatingObj->setShouldPaint(false); // We are not in the direct inheritance chain for this float. We will never paint it.
floatingObj->m_renderer = r->m_renderer;
// We create the floating object list lazily.
if (!m_floatingObjects)
createFloatingObjects();
m_floatingObjects->add(floatingObj);
}
}
}
}
bool RenderBlock::avoidsFloats() const
{
// Floats can't intrude into our box if we have a non-auto column count or width.
return RenderBox::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth();
}
bool RenderBlock::containsFloat(RenderBox* renderer) const
{
return m_floatingObjects && m_floatingObjects->set().contains<RenderBox*, FloatingObjectHashTranslator>(renderer);
}
void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove, bool inLayout)
{
if (!everHadLayout() && !containsFloats())
return;
MarkingBehavior markParents = inLayout ? MarkOnlyThis : MarkContainingBlockChain;
setChildNeedsLayout(true, markParents);
if (floatToRemove)
removeFloatingObject(floatToRemove);
// Iterate over our children and mark them as needed.
if (!childrenInline()) {
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if ((!floatToRemove && child->isFloatingOrOutOfFlowPositioned()) || !child->isRenderBlock())
continue;
RenderBlock* childBlock = toRenderBlock(child);
if ((floatToRemove ? childBlock->containsFloat(floatToRemove) : childBlock->containsFloats()) || childBlock->shrinkToAvoidFloats())
childBlock->markAllDescendantsWithFloatsForLayout(floatToRemove, inLayout);
}
}
}
void RenderBlock::markSiblingsWithFloatsForLayout(RenderBox* floatToRemove)
{
if (!m_floatingObjects)
return;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (RenderObject* next = nextSibling(); next; next = next->nextSibling()) {
if (!next->isRenderBlock() || next->isFloatingOrOutOfFlowPositioned() || toRenderBlock(next)->avoidsFloats())
continue;
RenderBlock* nextBlock = toRenderBlock(next);
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
RenderBox* floatingBox = (*it)->renderer();
if (floatToRemove && floatingBox != floatToRemove)
continue;
if (nextBlock->containsFloat(floatingBox))
nextBlock->markAllDescendantsWithFloatsForLayout(floatingBox);
}
}
}
LayoutUnit RenderBlock::getClearDelta(RenderBox* child, LayoutUnit logicalTop)
{
// There is no need to compute clearance if we have no floats.
if (!containsFloats())
return 0;
// At least one float is present. We need to perform the clearance computation.
bool clearSet = child->style()->clear() != CNONE;
LayoutUnit logicalBottom = 0;
switch (child->style()->clear()) {
case CNONE:
break;
case CLEFT:
logicalBottom = lowestFloatLogicalBottom(FloatingObject::FloatLeft);
break;
case CRIGHT:
logicalBottom = lowestFloatLogicalBottom(FloatingObject::FloatRight);
break;
case CBOTH:
logicalBottom = lowestFloatLogicalBottom();
break;
}
// We also clear floats if we are too big to sit on the same line as a float (and wish to avoid floats by default).
LayoutUnit result = clearSet ? max<LayoutUnit>(0, logicalBottom - logicalTop) : LayoutUnit();
if (!result && child->avoidsFloats()) {
LayoutUnit newLogicalTop = logicalTop;
while (true) {
LayoutUnit availableLogicalWidthAtNewLogicalTopOffset = availableLogicalWidthForLine(newLogicalTop, false, logicalHeightForChild(child));
if (availableLogicalWidthAtNewLogicalTopOffset == availableLogicalWidthForContent(newLogicalTop))
return newLogicalTop - logicalTop;
RenderRegion* region = regionAtBlockOffset(logicalTopForChild(child));
LayoutRect borderBox = child->borderBoxRectInRegion(region, DoNotCacheRenderBoxRegionInfo);
LayoutUnit childLogicalWidthAtOldLogicalTopOffset = isHorizontalWritingMode() ? borderBox.width() : borderBox.height();
// FIXME: None of this is right for perpendicular writing-mode children.
LayoutUnit childOldLogicalWidth = child->logicalWidth();
LayoutUnit childOldMarginLeft = child->marginLeft();
LayoutUnit childOldMarginRight = child->marginRight();
LayoutUnit childOldLogicalTop = child->logicalTop();
child->setLogicalTop(newLogicalTop);
child->updateLogicalWidth();
region = regionAtBlockOffset(logicalTopForChild(child));
borderBox = child->borderBoxRectInRegion(region, DoNotCacheRenderBoxRegionInfo);
LayoutUnit childLogicalWidthAtNewLogicalTopOffset = isHorizontalWritingMode() ? borderBox.width() : borderBox.height();
child->setLogicalTop(childOldLogicalTop);
child->setLogicalWidth(childOldLogicalWidth);
child->setMarginLeft(childOldMarginLeft);
child->setMarginRight(childOldMarginRight);
if (childLogicalWidthAtNewLogicalTopOffset <= availableLogicalWidthAtNewLogicalTopOffset) {
// Even though we may not be moving, if the logical width did shrink because of the presence of new floats, then
// we need to force a relayout as though we shifted. This happens because of the dynamic addition of overhanging floats
// from previous siblings when negative margins exist on a child (see the addOverhangingFloats call at the end of collapseMargins).
if (childLogicalWidthAtOldLogicalTopOffset != childLogicalWidthAtNewLogicalTopOffset)
child->setChildNeedsLayout(true, MarkOnlyThis);
return newLogicalTop - logicalTop;
}
newLogicalTop = nextFloatLogicalBottomBelow(newLogicalTop);
ASSERT(newLogicalTop >= logicalTop);
if (newLogicalTop < logicalTop)
break;
}
ASSERT_NOT_REACHED();
}
return result;
}
bool RenderBlock::isPointInOverflowControl(HitTestResult& result, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset)
{
if (!scrollsOverflow())
return false;
return layer()->hitTestOverflowControls(result, roundedIntPoint(locationInContainer - toLayoutSize(accumulatedOffset)));
}
Node* RenderBlock::nodeForHitTest() const
{
// If we are in the margins of block elements that are part of a
// continuation we're actually still inside the enclosing element
// that was split. Use the appropriate inner node.
return isAnonymousBlockContinuation() ? continuation()->node() : node();
}
bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
LayoutPoint adjustedLocation(accumulatedOffset + location());
LayoutSize localOffset = toLayoutSize(adjustedLocation);
if (!isRenderView()) {
// Check if we need to do anything at all.
LayoutRect overflowBox = visualOverflowRect();
flipForWritingMode(overflowBox);
overflowBox.moveBy(adjustedLocation);
if (!locationInContainer.intersects(overflowBox))
return false;
}
if ((hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) && isPointInOverflowControl(result, locationInContainer.point(), adjustedLocation)) {
updateHitTestResult(result, locationInContainer.point() - localOffset);
// FIXME: isPointInOverflowControl() doesn't handle rect-based tests yet.
if (!result.addNodeToRectBasedTestResult(nodeForHitTest(), request, locationInContainer))
return true;
}
// If we have clipping, then we can't have any spillout.
bool useOverflowClip = hasOverflowClip() && !hasSelfPaintingLayer();
bool useClip = (hasControlClip() || useOverflowClip);
bool checkChildren = !useClip || (hasControlClip() ? locationInContainer.intersects(controlClipRect(adjustedLocation)) : locationInContainer.intersects(overflowClipRect(adjustedLocation, locationInContainer.region(), IncludeOverlayScrollbarSize)));
if (checkChildren) {
// Hit test descendants first.
LayoutSize scrolledOffset(localOffset);
if (hasOverflowClip())
scrolledOffset -= scrolledContentOffset();
// Hit test contents if we don't have columns.
if (!hasColumns()) {
if (hitTestContents(request, result, locationInContainer, toLayoutPoint(scrolledOffset), hitTestAction)) {
updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - localOffset));
return true;
}
if (hitTestAction == HitTestFloat && hitTestFloats(request, result, locationInContainer, toLayoutPoint(scrolledOffset)))
return true;
} else if (hitTestColumns(request, result, locationInContainer, toLayoutPoint(scrolledOffset), hitTestAction)) {
updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - localOffset));
return true;
}
}
// Check if the point is outside radii.
if (!isRenderView() && style()->hasBorderRadius()) {
LayoutRect borderRect = borderBoxRect();
borderRect.moveBy(adjustedLocation);
RoundedRect border = style()->getRoundedBorderFor(borderRect, view());
if (!locationInContainer.intersects(border))
return false;
}
// Now hit test our background
if (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) {
LayoutRect boundsRect(adjustedLocation, size());
if (visibleToHitTesting() && locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - localOffset));
if (!result.addNodeToRectBasedTestResult(nodeForHitTest(), request, locationInContainer, boundsRect))
return true;
}
}
return false;
}
bool RenderBlock::hitTestFloats(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset)
{
if (!m_floatingObjects)
return false;
LayoutPoint adjustedLocation = accumulatedOffset;
if (isRenderView()) {
adjustedLocation += toLayoutSize(toRenderView(this)->frameView()->scrollPosition());
}
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator begin = floatingObjectSet.begin();
for (FloatingObjectSetIterator it = floatingObjectSet.end(); it != begin;) {
--it;
FloatingObject* floatingObject = *it;
if (floatingObject->shouldPaint() && !floatingObject->m_renderer->hasSelfPaintingLayer()) {
LayoutUnit xOffset = xPositionForFloatIncludingMargin(floatingObject) - floatingObject->m_renderer->x();
LayoutUnit yOffset = yPositionForFloatIncludingMargin(floatingObject) - floatingObject->m_renderer->y();
LayoutPoint childPoint = flipFloatForWritingModeForChild(floatingObject, adjustedLocation + LayoutSize(xOffset, yOffset));
if (floatingObject->m_renderer->hitTest(request, result, locationInContainer, childPoint)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(childPoint));
return true;
}
}
}
return false;
}
class ColumnRectIterator {
WTF_MAKE_NONCOPYABLE(ColumnRectIterator);
public:
ColumnRectIterator(const RenderBlock& block)
: m_block(block)
, m_colInfo(block.columnInfo())
, m_direction(m_block.style()->isFlippedBlocksWritingMode() ? 1 : -1)
, m_isHorizontal(block.isHorizontalWritingMode())
, m_logicalLeft(block.logicalLeftOffsetForContent())
{
int colCount = m_colInfo->columnCount();
m_colIndex = colCount - 1;
m_currLogicalTopOffset = colCount * m_colInfo->columnHeight() * m_direction;
update();
}
void advance()
{
ASSERT(hasMore());
m_colIndex--;
update();
}
LayoutRect columnRect() const { return m_colRect; }
bool hasMore() const { return m_colIndex >= 0; }
void adjust(LayoutSize& offset) const
{
LayoutUnit currLogicalLeftOffset = (m_isHorizontal ? m_colRect.x() : m_colRect.y()) - m_logicalLeft;
offset += m_isHorizontal ? LayoutSize(currLogicalLeftOffset, m_currLogicalTopOffset) : LayoutSize(m_currLogicalTopOffset, currLogicalLeftOffset);
if (m_colInfo->progressionAxis() == ColumnInfo::BlockAxis) {
if (m_isHorizontal)
offset.expand(0, m_colRect.y() - m_block.borderTop() - m_block.paddingTop());
else
offset.expand(m_colRect.x() - m_block.borderLeft() - m_block.paddingLeft(), 0);
}
}
private:
void update()
{
if (m_colIndex < 0)
return;
m_colRect = m_block.columnRectAt(const_cast<ColumnInfo*>(m_colInfo), m_colIndex);
m_block.flipForWritingMode(m_colRect);
m_currLogicalTopOffset -= (m_isHorizontal ? m_colRect.height() : m_colRect.width()) * m_direction;
}
const RenderBlock& m_block;
const ColumnInfo* const m_colInfo;
const int m_direction;
const bool m_isHorizontal;
const LayoutUnit m_logicalLeft;
int m_colIndex;
LayoutUnit m_currLogicalTopOffset;
LayoutRect m_colRect;
};
bool RenderBlock::hitTestColumns(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
// We need to do multiple passes, breaking up our hit testing into strips.
if (!hasColumns())
return false;
for (ColumnRectIterator it(*this); it.hasMore(); it.advance()) {
LayoutRect hitRect = locationInContainer.boundingBox();
LayoutRect colRect = it.columnRect();
colRect.moveBy(accumulatedOffset);
if (locationInContainer.intersects(colRect)) {
// The point is inside this column.
// Adjust accumulatedOffset to change where we hit test.
LayoutSize offset;
it.adjust(offset);
LayoutPoint finalLocation = accumulatedOffset + offset;
if (!result.isRectBasedTest() || colRect.contains(hitRect))
return hitTestContents(request, result, locationInContainer, finalLocation, hitTestAction) || (hitTestAction == HitTestFloat && hitTestFloats(request, result, locationInContainer, finalLocation));
hitTestContents(request, result, locationInContainer, finalLocation, hitTestAction);
}
}
return false;
}
void RenderBlock::adjustForColumnRect(LayoutSize& offset, const LayoutPoint& locationInContainer) const
{
for (ColumnRectIterator it(*this); it.hasMore(); it.advance()) {
LayoutRect colRect = it.columnRect();
if (colRect.contains(locationInContainer)) {
it.adjust(offset);
return;
}
}
}
bool RenderBlock::hitTestContents(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
if (childrenInline() && !isTable()) {
// We have to hit-test our line boxes.
if (m_lineBoxes.hitTest(this, request, result, locationInContainer, accumulatedOffset, hitTestAction))
return true;
} else {
// Hit test our children.
HitTestAction childHitTest = hitTestAction;
if (hitTestAction == HitTestChildBlockBackgrounds)
childHitTest = HitTestChildBlockBackground;
for (RenderBox* child = lastChildBox(); child; child = child->previousSiblingBox()) {
LayoutPoint childPoint = flipForWritingModeForChild(child, accumulatedOffset);
if (!child->hasSelfPaintingLayer() && !child->isFloating() && child->nodeAtPoint(request, result, locationInContainer, childPoint, childHitTest))
return true;
}
}
return false;
}
Position RenderBlock::positionForBox(InlineBox *box, bool start) const
{
if (!box)
return Position();
if (!box->renderer()->nonPseudoNode())
return createLegacyEditingPosition(nonPseudoNode(), start ? caretMinOffset() : caretMaxOffset());
if (!box->isInlineTextBox())
return createLegacyEditingPosition(box->renderer()->nonPseudoNode(), start ? box->renderer()->caretMinOffset() : box->renderer()->caretMaxOffset());
InlineTextBox* textBox = toInlineTextBox(box);
return createLegacyEditingPosition(box->renderer()->nonPseudoNode(), start ? textBox->start() : textBox->start() + textBox->len());
}
static inline bool isEditingBoundary(RenderObject* ancestor, RenderObject* child)
{
ASSERT(!ancestor || ancestor->nonPseudoNode());
ASSERT(child && child->nonPseudoNode());
return !ancestor || !ancestor->parent() || (ancestor->hasLayer() && ancestor->parent()->isRenderView())
|| ancestor->nonPseudoNode()->rendererIsEditable() == child->nonPseudoNode()->rendererIsEditable();
}
// FIXME: This function should go on RenderObject as an instance method. Then
// all cases in which positionForPoint recurs could call this instead to
// prevent crossing editable boundaries. This would require many tests.
static VisiblePosition positionForPointRespectingEditingBoundaries(RenderBlock* parent, RenderBox* child, const LayoutPoint& pointInParentCoordinates)
{
LayoutPoint childLocation = child->location();
if (child->hasPaintOffset())
childLocation += child->paintOffset();
// FIXME: This is wrong if the child's writing-mode is different from the parent's.
LayoutPoint pointInChildCoordinates(toLayoutPoint(pointInParentCoordinates - childLocation));
// If this is an anonymous renderer, we just recur normally
Node* childNode = child->nonPseudoNode();
if (!childNode)
return child->positionForPoint(pointInChildCoordinates);
// Otherwise, first make sure that the editability of the parent and child agree.
// If they don't agree, then we return a visible position just before or after the child
RenderObject* ancestor = parent;
while (ancestor && !ancestor->nonPseudoNode())
ancestor = ancestor->parent();
// If we can't find an ancestor to check editability on, or editability is unchanged, we recur like normal
if (isEditingBoundary(ancestor, child))
return child->positionForPoint(pointInChildCoordinates);
// Otherwise return before or after the child, depending on if the click was to the logical left or logical right of the child
LayoutUnit childMiddle = parent->logicalWidthForChild(child) / 2;
LayoutUnit logicalLeft = parent->isHorizontalWritingMode() ? pointInChildCoordinates.x() : pointInChildCoordinates.y();
if (logicalLeft < childMiddle)
return ancestor->createVisiblePosition(childNode->nodeIndex(), DOWNSTREAM);
return ancestor->createVisiblePosition(childNode->nodeIndex() + 1, UPSTREAM);
}
VisiblePosition RenderBlock::positionForPointWithInlineChildren(const LayoutPoint& pointInLogicalContents)
{
ASSERT(childrenInline());
if (!firstRootBox())
return createVisiblePosition(0, DOWNSTREAM);
bool linesAreFlipped = style()->isFlippedLinesWritingMode();
bool blocksAreFlipped = style()->isFlippedBlocksWritingMode();
// look for the closest line box in the root box which is at the passed-in y coordinate
InlineBox* closestBox = 0;
RootInlineBox* firstRootBoxWithChildren = 0;
RootInlineBox* lastRootBoxWithChildren = 0;
for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {
if (!root->firstLeafChild())
continue;
if (!firstRootBoxWithChildren)
firstRootBoxWithChildren = root;
if (!linesAreFlipped && root->isFirstAfterPageBreak() && (pointInLogicalContents.y() < root->lineTopWithLeading()
|| (blocksAreFlipped && pointInLogicalContents.y() == root->lineTopWithLeading())))
break;
lastRootBoxWithChildren = root;
// check if this root line box is located at this y coordinate
if (pointInLogicalContents.y() < root->selectionBottom() || (blocksAreFlipped && pointInLogicalContents.y() == root->selectionBottom())) {
if (linesAreFlipped) {
RootInlineBox* nextRootBoxWithChildren = root->nextRootBox();
while (nextRootBoxWithChildren && !nextRootBoxWithChildren->firstLeafChild())
nextRootBoxWithChildren = nextRootBoxWithChildren->nextRootBox();
if (nextRootBoxWithChildren && nextRootBoxWithChildren->isFirstAfterPageBreak() && (pointInLogicalContents.y() > nextRootBoxWithChildren->lineTopWithLeading()
|| (!blocksAreFlipped && pointInLogicalContents.y() == nextRootBoxWithChildren->lineTopWithLeading())))
continue;
}
closestBox = root->closestLeafChildForLogicalLeftPosition(pointInLogicalContents.x());
if (closestBox)
break;
}
}
bool moveCaretToBoundary = document()->frame()->editor().behavior().shouldMoveCaretToHorizontalBoundaryWhenPastTopOrBottom();
if (!moveCaretToBoundary && !closestBox && lastRootBoxWithChildren) {
// y coordinate is below last root line box, pretend we hit it
closestBox = lastRootBoxWithChildren->closestLeafChildForLogicalLeftPosition(pointInLogicalContents.x());
}
if (closestBox) {
if (moveCaretToBoundary) {
LayoutUnit firstRootBoxWithChildrenTop = min<LayoutUnit>(firstRootBoxWithChildren->selectionTop(), firstRootBoxWithChildren->logicalTop());
if (pointInLogicalContents.y() < firstRootBoxWithChildrenTop
|| (blocksAreFlipped && pointInLogicalContents.y() == firstRootBoxWithChildrenTop)) {
InlineBox* box = firstRootBoxWithChildren->firstLeafChild();
if (box->isLineBreak()) {
if (InlineBox* newBox = box->nextLeafChildIgnoringLineBreak())
box = newBox;
}
// y coordinate is above first root line box, so return the start of the first
return VisiblePosition(positionForBox(box, true), DOWNSTREAM);
}
}
// pass the box a top position that is inside it
LayoutPoint point(pointInLogicalContents.x(), closestBox->root()->blockDirectionPointInLine());
if (!isHorizontalWritingMode())
point = point.transposedPoint();
if (closestBox->renderer()->isReplaced())
return positionForPointRespectingEditingBoundaries(this, toRenderBox(closestBox->renderer()), point);
return closestBox->renderer()->positionForPoint(point);
}
if (lastRootBoxWithChildren) {
// We hit this case for Mac behavior when the Y coordinate is below the last box.
ASSERT(moveCaretToBoundary);
InlineBox* logicallyLastBox;
if (lastRootBoxWithChildren->getLogicalEndBoxWithNode(logicallyLastBox))
return VisiblePosition(positionForBox(logicallyLastBox, false), DOWNSTREAM);
}
// Can't reach this. We have a root line box, but it has no kids.
// FIXME: This should ASSERT_NOT_REACHED(), but clicking on placeholder text
// seems to hit this code path.
return createVisiblePosition(0, DOWNSTREAM);
}
static inline bool isChildHitTestCandidate(RenderBox* box)
{
return box->height() && box->style()->visibility() == VISIBLE && !box->isFloatingOrOutOfFlowPositioned();
}
VisiblePosition RenderBlock::positionForPoint(const LayoutPoint& point)
{
if (isTable())
return RenderBox::positionForPoint(point);
if (isReplaced()) {
// FIXME: This seems wrong when the object's writing-mode doesn't match the line's writing-mode.
LayoutUnit pointLogicalLeft = isHorizontalWritingMode() ? point.x() : point.y();
LayoutUnit pointLogicalTop = isHorizontalWritingMode() ? point.y() : point.x();
if (pointLogicalTop < 0 || (pointLogicalTop < logicalHeight() && pointLogicalLeft < 0))
return createVisiblePosition(caretMinOffset(), DOWNSTREAM);
if (pointLogicalTop >= logicalHeight() || (pointLogicalTop >= 0 && pointLogicalLeft >= logicalWidth()))
return createVisiblePosition(caretMaxOffset(), DOWNSTREAM);
}
LayoutPoint pointInContents = point;
offsetForContents(pointInContents);
LayoutPoint pointInLogicalContents(pointInContents);
if (!isHorizontalWritingMode())
pointInLogicalContents = pointInLogicalContents.transposedPoint();
if (childrenInline())
return positionForPointWithInlineChildren(pointInLogicalContents);
RenderBox* lastCandidateBox = lastChildBox();
while (lastCandidateBox && !isChildHitTestCandidate(lastCandidateBox))
lastCandidateBox = lastCandidateBox->previousSiblingBox();
bool blocksAreFlipped = style()->isFlippedBlocksWritingMode();
if (lastCandidateBox) {
if (pointInLogicalContents.y() > logicalTopForChild(lastCandidateBox)
|| (!blocksAreFlipped && pointInLogicalContents.y() == logicalTopForChild(lastCandidateBox)))
return positionForPointRespectingEditingBoundaries(this, lastCandidateBox, pointInContents);
for (RenderBox* childBox = firstChildBox(); childBox; childBox = childBox->nextSiblingBox()) {
if (!isChildHitTestCandidate(childBox))
continue;
LayoutUnit childLogicalBottom = logicalTopForChild(childBox) + logicalHeightForChild(childBox);
// We hit child if our click is above the bottom of its padding box (like IE6/7 and FF3).
if (isChildHitTestCandidate(childBox) && (pointInLogicalContents.y() < childLogicalBottom
|| (blocksAreFlipped && pointInLogicalContents.y() == childLogicalBottom)))
return positionForPointRespectingEditingBoundaries(this, childBox, pointInContents);
}
}
// We only get here if there are no hit test candidate children below the click.
return RenderBox::positionForPoint(point);
}
void RenderBlock::offsetForContents(LayoutPoint& offset) const
{
offset = flipForWritingMode(offset);
if (hasOverflowClip())
offset += scrolledContentOffset();
if (hasColumns())
adjustPointToColumnContents(offset);
offset = flipForWritingMode(offset);
}
LayoutUnit RenderBlock::availableLogicalWidth() const
{
// If we have multiple columns, then the available logical width is reduced to our column width.
if (hasColumns())
return desiredColumnWidth();
return RenderBox::availableLogicalWidth();
}
int RenderBlock::columnGap() const
{
if (style()->hasNormalColumnGap())
return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. Matches <p> margins.
return static_cast<int>(style()->columnGap());
}
void RenderBlock::calcColumnWidth()
{
if (document()->regionBasedColumnsEnabled())
return;
// Calculate our column width and column count.
// FIXME: Can overflow on fast/block/float/float-not-removed-from-next-sibling4.html, see https://bugs.webkit.org/show_bug.cgi?id=68744
unsigned desiredColumnCount = 1;
LayoutUnit desiredColumnWidth = contentLogicalWidth();
// For now, we don't support multi-column layouts when printing, since we have to do a lot of work for proper pagination.
if (document()->paginated() || (style()->hasAutoColumnCount() && style()->hasAutoColumnWidth()) || !style()->hasInlineColumnAxis()) {
setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);
return;
}
LayoutUnit availWidth = desiredColumnWidth;
LayoutUnit colGap = columnGap();
LayoutUnit colWidth = max<LayoutUnit>(1, LayoutUnit(style()->columnWidth()));
int colCount = max<int>(1, style()->columnCount());
if (style()->hasAutoColumnWidth() && !style()->hasAutoColumnCount()) {
desiredColumnCount = colCount;
desiredColumnWidth = max<LayoutUnit>(0, (availWidth - ((desiredColumnCount - 1) * colGap)) / desiredColumnCount);
} else if (!style()->hasAutoColumnWidth() && style()->hasAutoColumnCount()) {
desiredColumnCount = max<LayoutUnit>(1, (availWidth + colGap) / (colWidth + colGap));
desiredColumnWidth = ((availWidth + colGap) / desiredColumnCount) - colGap;
} else {
desiredColumnCount = max<LayoutUnit>(min<LayoutUnit>(colCount, (availWidth + colGap) / (colWidth + colGap)), 1);
desiredColumnWidth = ((availWidth + colGap) / desiredColumnCount) - colGap;
}
setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);
}
bool RenderBlock::requiresColumns(int desiredColumnCount) const
{
// If overflow-y is set to paged-x or paged-y on the body or html element, we'll handle the paginating
// in the RenderView instead.
bool isPaginated = (style()->overflowY() == OPAGEDX || style()->overflowY() == OPAGEDY) && !(isRoot() || isBody());
return firstChild()
&& (desiredColumnCount != 1 || !style()->hasAutoColumnWidth() || !style()->hasInlineColumnAxis() || isPaginated)
&& !firstChild()->isAnonymousColumnsBlock()
&& !firstChild()->isAnonymousColumnSpanBlock();
}
void RenderBlock::setDesiredColumnCountAndWidth(int count, LayoutUnit width)
{
bool destroyColumns = !requiresColumns(count);
if (destroyColumns) {
if (hasColumns()) {
gColumnInfoMap->take(this);
setHasColumns(false);
}
} else {
ColumnInfo* info;
if (hasColumns())
info = gColumnInfoMap->get(this);
else {
if (!gColumnInfoMap)
gColumnInfoMap = new ColumnInfoMap;
info = new ColumnInfo;
gColumnInfoMap->add(this, adoptPtr(info));
setHasColumns(true);
}
info->setDesiredColumnCount(count);
info->setDesiredColumnWidth(width);
info->setProgressionAxis(style()->hasInlineColumnAxis() ? ColumnInfo::InlineAxis : ColumnInfo::BlockAxis);
info->setProgressionIsReversed(style()->columnProgression() == ReverseColumnProgression);
}
}
void RenderBlock::updateColumnInfoFromStyle(RenderStyle* style)
{
if (!hasColumns())
return;
ColumnInfo* info = gColumnInfoMap->get(this);
bool needsLayout = false;
ColumnInfo::Axis oldAxis = info->progressionAxis();
ColumnInfo::Axis newAxis = style->hasInlineColumnAxis() ? ColumnInfo::InlineAxis : ColumnInfo::BlockAxis;
if (oldAxis != newAxis) {
info->setProgressionAxis(newAxis);
needsLayout = true;
}
bool oldProgressionIsReversed = info->progressionIsReversed();
bool newProgressionIsReversed = style->columnProgression() == ReverseColumnProgression;
if (oldProgressionIsReversed != newProgressionIsReversed) {
info->setProgressionIsReversed(newProgressionIsReversed);
needsLayout = true;
}
if (needsLayout)
setNeedsLayoutAndPrefWidthsRecalc();
}
LayoutUnit RenderBlock::desiredColumnWidth() const
{
if (!hasColumns())
return contentLogicalWidth();
return gColumnInfoMap->get(this)->desiredColumnWidth();
}
unsigned RenderBlock::desiredColumnCount() const
{
if (!hasColumns())
return 1;
return gColumnInfoMap->get(this)->desiredColumnCount();
}
ColumnInfo* RenderBlock::columnInfo() const
{
if (!hasColumns())
return 0;
return gColumnInfoMap->get(this);
}
unsigned RenderBlock::columnCount(ColumnInfo* colInfo) const
{
ASSERT(hasColumns());
ASSERT(gColumnInfoMap->get(this) == colInfo);
return colInfo->columnCount();
}
LayoutRect RenderBlock::columnRectAt(ColumnInfo* colInfo, unsigned index) const
{
ASSERT(hasColumns() && gColumnInfoMap->get(this) == colInfo);
// Compute the appropriate rect based off our information.
LayoutUnit colLogicalWidth = colInfo->desiredColumnWidth();
LayoutUnit colLogicalHeight = colInfo->columnHeight();
LayoutUnit colLogicalTop = borderBefore() + paddingBefore();
LayoutUnit colLogicalLeft = logicalLeftOffsetForContent();
LayoutUnit colGap = columnGap();
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis) {
if (style()->isLeftToRightDirection() ^ colInfo->progressionIsReversed())
colLogicalLeft += index * (colLogicalWidth + colGap);
else
colLogicalLeft += contentLogicalWidth() - colLogicalWidth - index * (colLogicalWidth + colGap);
} else {
if (!colInfo->progressionIsReversed())
colLogicalTop += index * (colLogicalHeight + colGap);
else
colLogicalTop += contentLogicalHeight() - colLogicalHeight - index * (colLogicalHeight + colGap);
}
if (isHorizontalWritingMode())
return LayoutRect(colLogicalLeft, colLogicalTop, colLogicalWidth, colLogicalHeight);
return LayoutRect(colLogicalTop, colLogicalLeft, colLogicalHeight, colLogicalWidth);
}
bool RenderBlock::relayoutForPagination(bool hasSpecifiedPageLogicalHeight, LayoutUnit pageLogicalHeight, LayoutStateMaintainer& statePusher)
{
if (!hasColumns())
return false;
OwnPtr<RenderOverflow> savedOverflow = m_overflow.release();
if (childrenInline())
addOverflowFromInlineChildren();
else
addOverflowFromBlockChildren();
LayoutUnit layoutOverflowLogicalBottom = (isHorizontalWritingMode() ? layoutOverflowRect().maxY() : layoutOverflowRect().maxX()) - borderBefore() - paddingBefore();
// FIXME: We don't balance properly at all in the presence of forced page breaks. We need to understand what
// the distance between forced page breaks is so that we can avoid making the minimum column height too tall.
ColumnInfo* colInfo = columnInfo();
if (!hasSpecifiedPageLogicalHeight) {
LayoutUnit columnHeight = pageLogicalHeight;
int minColumnCount = colInfo->forcedBreaks() + 1;
int desiredColumnCount = colInfo->desiredColumnCount();
if (minColumnCount >= desiredColumnCount) {
// The forced page breaks are in control of the balancing. Just set the column height to the
// maximum page break distance.
if (!pageLogicalHeight) {
LayoutUnit distanceBetweenBreaks = max<LayoutUnit>(colInfo->maximumDistanceBetweenForcedBreaks(),
view()->layoutState()->pageLogicalOffset(this, borderBefore() + paddingBefore() + layoutOverflowLogicalBottom) - colInfo->forcedBreakOffset());
columnHeight = max(colInfo->minimumColumnHeight(), distanceBetweenBreaks);
}
} else if (layoutOverflowLogicalBottom > boundedMultiply(pageLogicalHeight, desiredColumnCount)) {
// Now that we know the intrinsic height of the columns, we have to rebalance them.
columnHeight = max<LayoutUnit>(colInfo->minimumColumnHeight(), ceilf((float)layoutOverflowLogicalBottom / desiredColumnCount));
}
if (columnHeight && columnHeight != pageLogicalHeight) {
statePusher.pop();
setEverHadLayout(true);
layoutBlock(false, columnHeight);
return true;
}
}
if (pageLogicalHeight)
colInfo->setColumnCountAndHeight(ceilf((float)layoutOverflowLogicalBottom / pageLogicalHeight), pageLogicalHeight);
if (columnCount(colInfo)) {
setLogicalHeight(borderBefore() + paddingBefore() + colInfo->columnHeight() + borderAfter() + paddingAfter() + scrollbarLogicalHeight());
m_overflow.clear();
} else
m_overflow = savedOverflow.release();
return false;
}
void RenderBlock::adjustPointToColumnContents(LayoutPoint& point) const
{
// Just bail if we have no columns.
if (!hasColumns())
return;
ColumnInfo* colInfo = columnInfo();
if (!columnCount(colInfo))
return;
// Determine which columns we intersect.
LayoutUnit colGap = columnGap();
LayoutUnit halfColGap = colGap / 2;
LayoutPoint columnPoint(columnRectAt(colInfo, 0).location());
LayoutUnit logicalOffset = 0;
for (unsigned i = 0; i < colInfo->columnCount(); i++) {
// Add in half the column gap to the left and right of the rect.
LayoutRect colRect = columnRectAt(colInfo, i);
flipForWritingMode(colRect);
if (isHorizontalWritingMode() == (colInfo->progressionAxis() == ColumnInfo::InlineAxis)) {
LayoutRect gapAndColumnRect(colRect.x() - halfColGap, colRect.y(), colRect.width() + colGap, colRect.height());
if (point.x() >= gapAndColumnRect.x() && point.x() < gapAndColumnRect.maxX()) {
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis) {
// FIXME: The clamping that follows is not completely right for right-to-left
// content.
// Clamp everything above the column to its top left.
if (point.y() < gapAndColumnRect.y())
point = gapAndColumnRect.location();
// Clamp everything below the column to the next column's top left. If there is
// no next column, this still maps to just after this column.
else if (point.y() >= gapAndColumnRect.maxY()) {
point = gapAndColumnRect.location();
point.move(0, gapAndColumnRect.height());
}
} else {
if (point.x() < colRect.x())
point.setX(colRect.x());
else if (point.x() >= colRect.maxX())
point.setX(colRect.maxX() - 1);
}
// We're inside the column. Translate the x and y into our column coordinate space.
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
point.move(columnPoint.x() - colRect.x(), (!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset));
else
point.move((!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset) - colRect.x() + borderLeft() + paddingLeft(), 0);
return;
}
// Move to the next position.
logicalOffset += colInfo->progressionAxis() == ColumnInfo::InlineAxis ? colRect.height() : colRect.width();
} else {
LayoutRect gapAndColumnRect(colRect.x(), colRect.y() - halfColGap, colRect.width(), colRect.height() + colGap);
if (point.y() >= gapAndColumnRect.y() && point.y() < gapAndColumnRect.maxY()) {
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis) {
// FIXME: The clamping that follows is not completely right for right-to-left
// content.
// Clamp everything above the column to its top left.
if (point.x() < gapAndColumnRect.x())
point = gapAndColumnRect.location();
// Clamp everything below the column to the next column's top left. If there is
// no next column, this still maps to just after this column.
else if (point.x() >= gapAndColumnRect.maxX()) {
point = gapAndColumnRect.location();
point.move(gapAndColumnRect.width(), 0);
}
} else {
if (point.y() < colRect.y())
point.setY(colRect.y());
else if (point.y() >= colRect.maxY())
point.setY(colRect.maxY() - 1);
}
// We're inside the column. Translate the x and y into our column coordinate space.
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
point.move((!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset), columnPoint.y() - colRect.y());
else
point.move(0, (!style()->isFlippedBlocksWritingMode() ? logicalOffset : -logicalOffset) - colRect.y() + borderTop() + paddingTop());
return;
}
// Move to the next position.
logicalOffset += colInfo->progressionAxis() == ColumnInfo::InlineAxis ? colRect.width() : colRect.height();
}
}
}
void RenderBlock::adjustRectForColumns(LayoutRect& r) const
{
// Just bail if we have no columns.
if (!hasColumns())
return;
ColumnInfo* colInfo = columnInfo();
// Determine which columns we intersect.
unsigned colCount = columnCount(colInfo);
if (!colCount)
return;
// Begin with a result rect that is empty.
LayoutRect result;
bool isHorizontal = isHorizontalWritingMode();
LayoutUnit beforeBorderPadding = borderBefore() + paddingBefore();
LayoutUnit colHeight = colInfo->columnHeight();
if (!colHeight)
return;
LayoutUnit startOffset = max(isHorizontal ? r.y() : r.x(), beforeBorderPadding);
LayoutUnit endOffset = max(min<LayoutUnit>(isHorizontal ? r.maxY() : r.maxX(), beforeBorderPadding + colCount * colHeight), beforeBorderPadding);
// FIXME: Can overflow on fast/block/float/float-not-removed-from-next-sibling4.html, see https://bugs.webkit.org/show_bug.cgi?id=68744
unsigned startColumn = (startOffset - beforeBorderPadding) / colHeight;
unsigned endColumn = (endOffset - beforeBorderPadding) / colHeight;
if (startColumn == endColumn) {
// The rect is fully contained within one column. Adjust for our offsets
// and repaint only that portion.
LayoutUnit logicalLeftOffset = logicalLeftOffsetForContent();
LayoutRect colRect = columnRectAt(colInfo, startColumn);
LayoutRect repaintRect = r;
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis) {
if (isHorizontal)
repaintRect.move(colRect.x() - logicalLeftOffset, - static_cast<int>(startColumn) * colHeight);
else
repaintRect.move(- static_cast<int>(startColumn) * colHeight, colRect.y() - logicalLeftOffset);
} else {
if (isHorizontal)
repaintRect.move(0, colRect.y() - startColumn * colHeight - beforeBorderPadding);
else
repaintRect.move(colRect.x() - startColumn * colHeight - beforeBorderPadding, 0);
}
repaintRect.intersect(colRect);
result.unite(repaintRect);
} else {
// We span multiple columns. We can just unite the start and end column to get the final
// repaint rect.
result.unite(columnRectAt(colInfo, startColumn));
result.unite(columnRectAt(colInfo, endColumn));
}
r = result;
}
LayoutPoint RenderBlock::flipForWritingModeIncludingColumns(const LayoutPoint& point) const
{
ASSERT(hasColumns());
if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
return point;
ColumnInfo* colInfo = columnInfo();
LayoutUnit columnLogicalHeight = colInfo->columnHeight();
LayoutUnit expandedLogicalHeight = borderBefore() + paddingBefore() + columnCount(colInfo) * columnLogicalHeight + borderAfter() + paddingAfter() + scrollbarLogicalHeight();
if (isHorizontalWritingMode())
return LayoutPoint(point.x(), expandedLogicalHeight - point.y());
return LayoutPoint(expandedLogicalHeight - point.x(), point.y());
}
void RenderBlock::adjustStartEdgeForWritingModeIncludingColumns(LayoutRect& rect) const
{
ASSERT(hasColumns());
if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
return;
ColumnInfo* colInfo = columnInfo();
LayoutUnit columnLogicalHeight = colInfo->columnHeight();
LayoutUnit expandedLogicalHeight = borderBefore() + paddingBefore() + columnCount(colInfo) * columnLogicalHeight + borderAfter() + paddingAfter() + scrollbarLogicalHeight();
if (isHorizontalWritingMode())
rect.setY(expandedLogicalHeight - rect.maxY());
else
rect.setX(expandedLogicalHeight - rect.maxX());
}
void RenderBlock::adjustForColumns(LayoutSize& offset, const LayoutPoint& point) const
{
if (!hasColumns())
return;
ColumnInfo* colInfo = columnInfo();
LayoutUnit logicalLeft = logicalLeftOffsetForContent();
unsigned colCount = columnCount(colInfo);
LayoutUnit colLogicalWidth = colInfo->desiredColumnWidth();
LayoutUnit colLogicalHeight = colInfo->columnHeight();
for (unsigned i = 0; i < colCount; ++i) {
// Compute the edges for a given column in the block progression direction.
LayoutRect sliceRect = LayoutRect(logicalLeft, borderBefore() + paddingBefore() + i * colLogicalHeight, colLogicalWidth, colLogicalHeight);
if (!isHorizontalWritingMode())
sliceRect = sliceRect.transposedRect();
LayoutUnit logicalOffset = i * colLogicalHeight;
// Now we're in the same coordinate space as the point. See if it is inside the rectangle.
if (isHorizontalWritingMode()) {
if (point.y() >= sliceRect.y() && point.y() < sliceRect.maxY()) {
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
offset.expand(columnRectAt(colInfo, i).x() - logicalLeft, -logicalOffset);
else
offset.expand(0, columnRectAt(colInfo, i).y() - logicalOffset - borderBefore() - paddingBefore());
return;
}
} else {
if (point.x() >= sliceRect.x() && point.x() < sliceRect.maxX()) {
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
offset.expand(-logicalOffset, columnRectAt(colInfo, i).y() - logicalLeft);
else
offset.expand(columnRectAt(colInfo, i).x() - logicalOffset - borderBefore() - paddingBefore(), 0);
return;
}
}
}
}
void RenderBlock::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
if (childrenInline()) {
// FIXME: Remove this const_cast.
const_cast<RenderBlock*>(this)->computeInlinePreferredLogicalWidths(minLogicalWidth, maxLogicalWidth);
} else
computeBlockPreferredLogicalWidths(minLogicalWidth, maxLogicalWidth);
maxLogicalWidth = max(minLogicalWidth, maxLogicalWidth);
if (!style()->autoWrap() && childrenInline()) {
minLogicalWidth = maxLogicalWidth;
// A horizontal marquee with inline children has no minimum width.
if (layer() && layer()->marquee() && layer()->marquee()->isHorizontal())
minLogicalWidth = 0;
}
if (isTableCell()) {
Length tableCellWidth = toRenderTableCell(this)->styleOrColLogicalWidth();
if (tableCellWidth.isFixed() && tableCellWidth.value() > 0)
maxLogicalWidth = max(minLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(tableCellWidth.value()));
}
int scrollbarWidth = instrinsicScrollbarLogicalWidth();
maxLogicalWidth += scrollbarWidth;
minLogicalWidth += scrollbarWidth;
}
void RenderBlock::computePreferredLogicalWidths()
{
ASSERT(preferredLogicalWidthsDirty());
updateFirstLetter();
m_minPreferredLogicalWidth = 0;
m_maxPreferredLogicalWidth = 0;
RenderStyle* styleToUse = style();
if (!isTableCell() && styleToUse->logicalWidth().isFixed() && styleToUse->logicalWidth().value() >= 0
&& !(isDeprecatedFlexItem() && !styleToUse->logicalWidth().intValue()))
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalWidth().value());
else
computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
if (styleToUse->logicalMinWidth().isFixed() && styleToUse->logicalMinWidth().value() > 0) {
m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
}
if (styleToUse->logicalMaxWidth().isFixed()) {
m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
}
// Table layout uses integers, ceil the preferred widths to ensure that they can contain the contents.
if (isTableCell()) {
m_minPreferredLogicalWidth = m_minPreferredLogicalWidth.ceil();
m_maxPreferredLogicalWidth = m_maxPreferredLogicalWidth.ceil();
}
LayoutUnit borderAndPadding = borderAndPaddingLogicalWidth();
m_minPreferredLogicalWidth += borderAndPadding;
m_maxPreferredLogicalWidth += borderAndPadding;
setPreferredLogicalWidthsDirty(false);
}
struct InlineMinMaxIterator {
/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to
inline min/max width calculations. Note the following about the way it walks:
(1) Positioned content is skipped (since it does not contribute to min/max width of a block)
(2) We do not drill into the children of floats or replaced elements, since you can't break
in the middle of such an element.
(3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have
distinct borders/margin/padding that contribute to the min/max width.
*/
RenderObject* parent;
RenderObject* current;
bool endOfInline;
InlineMinMaxIterator(RenderObject* p, bool end = false)
:parent(p), current(p), endOfInline(end) {}
RenderObject* next();
};
RenderObject* InlineMinMaxIterator::next()
{
RenderObject* result = 0;
bool oldEndOfInline = endOfInline;
endOfInline = false;
while (current || current == parent) {
if (!oldEndOfInline &&
(current == parent ||
(!current->isFloating() && !current->isReplaced() && !current->isOutOfFlowPositioned())))
result = current->firstChild();
if (!result) {
// We hit the end of our inline. (It was empty, e.g., <span></span>.)
if (!oldEndOfInline && current->isRenderInline()) {
result = current;
endOfInline = true;
break;
}
while (current && current != parent) {
result = current->nextSibling();
if (result) break;
current = current->parent();
if (current && current != parent && current->isRenderInline()) {
result = current;
endOfInline = true;
break;
}
}
}
if (!result)
break;
if (!result->isOutOfFlowPositioned() && (result->isText() || result->isFloating() || result->isReplaced() || result->isRenderInline()))
break;
current = result;
result = 0;
}
// Update our position.
current = result;
return current;
}
static LayoutUnit getBPMWidth(LayoutUnit childValue, Length cssUnit)
{
if (cssUnit.type() != Auto)
return (cssUnit.isFixed() ? static_cast<LayoutUnit>(cssUnit.value()) : childValue);
return 0;
}
static LayoutUnit getBorderPaddingMargin(const RenderBoxModelObject* child, bool endOfInline)
{
RenderStyle* childStyle = child->style();
if (endOfInline)
return getBPMWidth(child->marginEnd(), childStyle->marginEnd()) +
getBPMWidth(child->paddingEnd(), childStyle->paddingEnd()) +
child->borderEnd();
return getBPMWidth(child->marginStart(), childStyle->marginStart()) +
getBPMWidth(child->paddingStart(), childStyle->paddingStart()) +
child->borderStart();
}
static inline void stripTrailingSpace(float& inlineMax, float& inlineMin,
RenderObject* trailingSpaceChild)
{
if (trailingSpaceChild && trailingSpaceChild->isText()) {
// Collapse away the trailing space at the end of a block.
RenderText* t = toRenderText(trailingSpaceChild);
const UChar space = ' ';
const Font& font = t->style()->font(); // FIXME: This ignores first-line.
float spaceWidth = font.width(RenderBlock::constructTextRun(t, font, &space, 1, t->style()));
inlineMax -= spaceWidth + font.wordSpacing();
if (inlineMin > inlineMax)
inlineMin = inlineMax;
}
}
static inline void updatePreferredWidth(LayoutUnit& preferredWidth, float& result)
{
LayoutUnit snappedResult = ceiledLayoutUnit(result);
preferredWidth = max(snappedResult, preferredWidth);
}
// With sub-pixel enabled: When converting between floating point and LayoutUnits
// we risk losing precision with each conversion. When this occurs while
// accumulating our preferred widths, we can wind up with a line width that's
// larger than our maxPreferredWidth due to pure float accumulation.
//
// With sub-pixel disabled: values from Lengths or the render tree aren't subject
// to the same loss of precision, as they're always truncated and stored as
// integers. We mirror that behavior here to prevent over-allocating our preferred
// width.
static inline LayoutUnit adjustFloatForSubPixelLayout(float value)
{
#if ENABLE(SUBPIXEL_LAYOUT)
return ceiledLayoutUnit(value);
#else
return static_cast<int>(value);
#endif
}
void RenderBlock::computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth)
{
float inlineMax = 0;
float inlineMin = 0;
RenderStyle* styleToUse = style();
RenderBlock* containingBlock = this->containingBlock();
LayoutUnit cw = containingBlock ? containingBlock->contentLogicalWidth() : LayoutUnit();
// If we are at the start of a line, we want to ignore all white-space.
// Also strip spaces if we previously had text that ended in a trailing space.
bool stripFrontSpaces = true;
RenderObject* trailingSpaceChild = 0;
// Firefox and Opera will allow a table cell to grow to fit an image inside it under
// very specific cirucumstances (in order to match common WinIE renderings).
// Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.)
bool allowImagesToBreak = !document()->inQuirksMode() || !isTableCell() || !styleToUse->logicalWidth().isIntrinsicOrAuto();
bool autoWrap, oldAutoWrap;
autoWrap = oldAutoWrap = styleToUse->autoWrap();
InlineMinMaxIterator childIterator(this);
// Only gets added to the max preffered width once.
bool addedTextIndent = false;
// Signals the text indent was more negative than the min preferred width
bool hasRemainingNegativeTextIndent = false;
LayoutUnit textIndent = minimumValueForLength(styleToUse->textIndent(), cw, view());
RenderObject* prevFloat = 0;
bool isPrevChildInlineFlow = false;
bool shouldBreakLineAfterText = false;
while (RenderObject* child = childIterator.next()) {
autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() :
child->style()->autoWrap();
if (!child->isBR()) {
// Step One: determine whether or not we need to go ahead and
// terminate our current line. Each discrete chunk can become
// the new min-width, if it is the widest chunk seen so far, and
// it can also become the max-width.
// Children fall into three categories:
// (1) An inline flow object. These objects always have a min/max of 0,
// and are included in the iteration solely so that their margins can
// be added in.
//
// (2) An inline non-text non-flow object, e.g., an inline replaced element.
// These objects can always be on a line by themselves, so in this situation
// we need to go ahead and break the current line, and then add in our own
// margins and min/max width on its own line, and then terminate the line.
//
// (3) A text object. Text runs can have breakable characters at the start,
// the middle or the end. They may also lose whitespace off the front if
// we're already ignoring whitespace. In order to compute accurate min-width
// information, we need three pieces of information.
// (a) the min-width of the first non-breakable run. Should be 0 if the text string
// starts with whitespace.
// (b) the min-width of the last non-breakable run. Should be 0 if the text string
// ends with whitespace.
// (c) the min/max width of the string (trimmed for whitespace).
//
// If the text string starts with whitespace, then we need to go ahead and
// terminate our current line (unless we're already in a whitespace stripping
// mode.
//
// If the text string has a breakable character in the middle, but didn't start
// with whitespace, then we add the width of the first non-breakable run and
// then end the current line. We then need to use the intermediate min/max width
// values (if any of them are larger than our current min/max). We then look at
// the width of the last non-breakable run and use that to start a new line
// (unless we end in whitespace).
RenderStyle* childStyle = child->style();
float childMin = 0;
float childMax = 0;
if (!child->isText()) {
// Case (1) and (2). Inline replaced and inline flow elements.
if (child->isRenderInline()) {
// Add in padding/border/margin from the appropriate side of
// the element.
float bpm = getBorderPaddingMargin(toRenderInline(child), childIterator.endOfInline);
childMin += bpm;
childMax += bpm;
inlineMin += childMin;
inlineMax += childMax;
child->setPreferredLogicalWidthsDirty(false);
} else {
// Inline replaced elts add in their margins to their min/max values.
LayoutUnit margins = 0;
Length startMargin = childStyle->marginStart();
Length endMargin = childStyle->marginEnd();
if (startMargin.isFixed())
margins += adjustFloatForSubPixelLayout(startMargin.value());
if (endMargin.isFixed())
margins += adjustFloatForSubPixelLayout(endMargin.value());
childMin += margins.ceilToFloat();
childMax += margins.ceilToFloat();
}
}
if (!child->isRenderInline() && !child->isText()) {
// Case (2). Inline replaced elements and floats.
// Go ahead and terminate the current line as far as
// minwidth is concerned.
childMin += child->minPreferredLogicalWidth().ceilToFloat();
childMax += child->maxPreferredLogicalWidth().ceilToFloat();
bool clearPreviousFloat;
if (child->isFloating()) {
clearPreviousFloat = (prevFloat
&& ((prevFloat->style()->floating() == LeftFloat && (childStyle->clear() & CLEFT))
|| (prevFloat->style()->floating() == RightFloat && (childStyle->clear() & CRIGHT))));
prevFloat = child;
} else
clearPreviousFloat = false;
bool canBreakReplacedElement = !child->isImage() || allowImagesToBreak;
if ((canBreakReplacedElement && (autoWrap || oldAutoWrap) && (!isPrevChildInlineFlow || shouldBreakLineAfterText)) || clearPreviousFloat) {
updatePreferredWidth(minLogicalWidth, inlineMin);
inlineMin = 0;
}
// If we're supposed to clear the previous float, then terminate maxwidth as well.
if (clearPreviousFloat) {
updatePreferredWidth(maxLogicalWidth, inlineMax);
inlineMax = 0;
}
// Add in text-indent. This is added in only once.
LayoutUnit ti = 0;
if (!addedTextIndent && !child->isFloating()) {
ti = textIndent;
childMin += ti.ceilToFloat();
childMax += ti.ceilToFloat();
if (childMin < 0)
textIndent = adjustFloatForSubPixelLayout(childMin);
else
addedTextIndent = true;
}
// Add our width to the max.
inlineMax += max<float>(0, childMax);
if (!autoWrap || !canBreakReplacedElement || (isPrevChildInlineFlow && !shouldBreakLineAfterText)) {
if (child->isFloating())
updatePreferredWidth(minLogicalWidth, childMin);
else
inlineMin += childMin;
} else {
// Now check our line.
updatePreferredWidth(minLogicalWidth, childMin);
// Now start a new line.
inlineMin = 0;
}
if (autoWrap && canBreakReplacedElement && isPrevChildInlineFlow) {
updatePreferredWidth(minLogicalWidth, inlineMin);
inlineMin = 0;
}
// We are no longer stripping whitespace at the start of
// a line.
if (!child->isFloating()) {
stripFrontSpaces = false;
trailingSpaceChild = 0;
}
} else if (child->isText()) {
// Case (3). Text.
RenderText* t = toRenderText(child);
if (t->isWordBreak()) {
updatePreferredWidth(minLogicalWidth, inlineMin);
inlineMin = 0;
continue;
}
if (t->style()->hasTextCombine() && t->isCombineText())
toRenderCombineText(t)->combineText();
// Determine if we have a breakable character. Pass in
// whether or not we should ignore any spaces at the front
// of the string. If those are going to be stripped out,
// then they shouldn't be considered in the breakable char
// check.
bool hasBreakableChar, hasBreak;
float beginMin, endMin;
bool beginWS, endWS;
float beginMax, endMax;
t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS,
hasBreakableChar, hasBreak, beginMax, endMax,
childMin, childMax, stripFrontSpaces);
// This text object will not be rendered, but it may still provide a breaking opportunity.
if (!hasBreak && childMax == 0) {
if (autoWrap && (beginWS || endWS)) {
updatePreferredWidth(minLogicalWidth, inlineMin);
inlineMin = 0;
}
continue;
}
if (stripFrontSpaces)
trailingSpaceChild = child;
else
trailingSpaceChild = 0;
// Add in text-indent. This is added in only once.
float ti = 0;
if (!addedTextIndent || hasRemainingNegativeTextIndent) {
ti = textIndent.ceilToFloat();
childMin += ti;
beginMin += ti;
// It the text indent negative and larger than the child minimum, we re-use the remainder
// in future minimum calculations, but using the negative value again on the maximum
// will lead to under-counting the max pref width.
if (!addedTextIndent) {
childMax += ti;
beginMax += ti;
addedTextIndent = true;
}
if (childMin < 0) {
textIndent = childMin;
hasRemainingNegativeTextIndent = true;
}
}
// If we have no breakable characters at all,
// then this is the easy case. We add ourselves to the current
// min and max and continue.
if (!hasBreakableChar) {
inlineMin += childMin;
} else {
// We have a breakable character. Now we need to know if
// we start and end with whitespace.
if (beginWS)
// Go ahead and end the current line.
updatePreferredWidth(minLogicalWidth, inlineMin);
else {
inlineMin += beginMin;
updatePreferredWidth(minLogicalWidth, inlineMin);
childMin -= ti;
}
inlineMin = childMin;
if (endWS) {
// We end in whitespace, which means we can go ahead
// and end our current line.
updatePreferredWidth(minLogicalWidth, inlineMin);
inlineMin = 0;
shouldBreakLineAfterText = false;
} else {
updatePreferredWidth(minLogicalWidth, inlineMin);
inlineMin = endMin;
shouldBreakLineAfterText = true;
}
}
if (hasBreak) {
inlineMax += beginMax;
updatePreferredWidth(maxLogicalWidth, inlineMax);
updatePreferredWidth(maxLogicalWidth, childMax);
inlineMax = endMax;
addedTextIndent = true;
} else
inlineMax += max<float>(0, childMax);
}
// Ignore spaces after a list marker.
if (child->isListMarker())
stripFrontSpaces = true;
} else {
updatePreferredWidth(minLogicalWidth, inlineMin);
updatePreferredWidth(maxLogicalWidth, inlineMax);
inlineMin = inlineMax = 0;
stripFrontSpaces = true;
trailingSpaceChild = 0;
addedTextIndent = true;
}
if (!child->isText() && child->isRenderInline())
isPrevChildInlineFlow = true;
else
isPrevChildInlineFlow = false;
oldAutoWrap = autoWrap;
}
if (styleToUse->collapseWhiteSpace())
stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);
updatePreferredWidth(minLogicalWidth, inlineMin);
updatePreferredWidth(maxLogicalWidth, inlineMax);
}
void RenderBlock::computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
RenderStyle* styleToUse = style();
bool nowrap = styleToUse->whiteSpace() == NOWRAP;
RenderObject* child = firstChild();
RenderBlock* containingBlock = this->containingBlock();
LayoutUnit floatLeftWidth = 0, floatRightWidth = 0;
while (child) {
// Positioned children don't affect the min/max width
if (child->isOutOfFlowPositioned()) {
child = child->nextSibling();
continue;
}
RenderStyle* childStyle = child->style();
if (child->isFloating() || (child->isBox() && toRenderBox(child)->avoidsFloats())) {
LayoutUnit floatTotalWidth = floatLeftWidth + floatRightWidth;
if (childStyle->clear() & CLEFT) {
maxLogicalWidth = max(floatTotalWidth, maxLogicalWidth);
floatLeftWidth = 0;
}
if (childStyle->clear() & CRIGHT) {
maxLogicalWidth = max(floatTotalWidth, maxLogicalWidth);
floatRightWidth = 0;
}
}
// A margin basically has three types: fixed, percentage, and auto (variable).
// Auto and percentage margins simply become 0 when computing min/max width.
// Fixed margins can be added in as is.
Length startMarginLength = childStyle->marginStartUsing(styleToUse);
Length endMarginLength = childStyle->marginEndUsing(styleToUse);
LayoutUnit margin = 0;
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
if (startMarginLength.isFixed())
marginStart += startMarginLength.value();
if (endMarginLength.isFixed())
marginEnd += endMarginLength.value();
margin = marginStart + marginEnd;
LayoutUnit childMinPreferredLogicalWidth, childMaxPreferredLogicalWidth;
if (child->isBox() && child->isHorizontalWritingMode() != isHorizontalWritingMode()) {
RenderBox* childBox = toRenderBox(child);
LogicalExtentComputedValues computedValues;
childBox->computeLogicalHeight(childBox->borderAndPaddingLogicalHeight(), 0, computedValues);
childMinPreferredLogicalWidth = childMaxPreferredLogicalWidth = computedValues.m_extent;
} else {
childMinPreferredLogicalWidth = child->minPreferredLogicalWidth();
childMaxPreferredLogicalWidth = child->maxPreferredLogicalWidth();
}
LayoutUnit w = childMinPreferredLogicalWidth + margin;
minLogicalWidth = max(w, minLogicalWidth);
// IE ignores tables for calculation of nowrap. Makes some sense.
if (nowrap && !child->isTable())
maxLogicalWidth = max(w, maxLogicalWidth);
w = childMaxPreferredLogicalWidth + margin;
if (!child->isFloating()) {
if (child->isBox() && toRenderBox(child)->avoidsFloats()) {
// Determine a left and right max value based off whether or not the floats can fit in the
// margins of the object. For negative margins, we will attempt to overlap the float if the negative margin
// is smaller than the float width.
bool ltr = containingBlock ? containingBlock->style()->isLeftToRightDirection() : styleToUse->isLeftToRightDirection();
LayoutUnit marginLogicalLeft = ltr ? marginStart : marginEnd;
LayoutUnit marginLogicalRight = ltr ? marginEnd : marginStart;
LayoutUnit maxLeft = marginLogicalLeft > 0 ? max(floatLeftWidth, marginLogicalLeft) : floatLeftWidth + marginLogicalLeft;
LayoutUnit maxRight = marginLogicalRight > 0 ? max(floatRightWidth, marginLogicalRight) : floatRightWidth + marginLogicalRight;
w = childMaxPreferredLogicalWidth + maxLeft + maxRight;
w = max(w, floatLeftWidth + floatRightWidth);
}
else
maxLogicalWidth = max(floatLeftWidth + floatRightWidth, maxLogicalWidth);
floatLeftWidth = floatRightWidth = 0;
}
if (child->isFloating()) {
if (childStyle->floating() == LeftFloat)
floatLeftWidth += w;
else
floatRightWidth += w;
} else
maxLogicalWidth = max(w, maxLogicalWidth);
child = child->nextSibling();
}
// Always make sure these values are non-negative.
minLogicalWidth = max<LayoutUnit>(0, minLogicalWidth);
maxLogicalWidth = max<LayoutUnit>(0, maxLogicalWidth);
maxLogicalWidth = max(floatLeftWidth + floatRightWidth, maxLogicalWidth);
}
bool RenderBlock::hasLineIfEmpty() const
{
if (!node())
return false;
if (node()->isRootEditableElement())
return true;
if (node()->isShadowRoot() && toShadowRoot(node())->host()->hasTagName(inputTag))
return true;
return false;
}
LayoutUnit RenderBlock::lineHeight(bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
{
// Inline blocks are replaced elements. Otherwise, just pass off to
// the base class. If we're being queried as though we're the root line
// box, then the fact that we're an inline-block is irrelevant, and we behave
// just like a block.
if (isReplaced() && linePositionMode == PositionOnContainingLine)
return RenderBox::lineHeight(firstLine, direction, linePositionMode);
if (firstLine && document()->styleSheetCollection()->usesFirstLineRules()) {
RenderStyle* s = style(firstLine);
if (s != style())
return s->computedLineHeight(view());
}
if (m_lineHeight == -1)
m_lineHeight = style()->computedLineHeight(view());
return m_lineHeight;
}
int RenderBlock::baselinePosition(FontBaseline baselineType, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
{
// Inline blocks are replaced elements. Otherwise, just pass off to
// the base class. If we're being queried as though we're the root line
// box, then the fact that we're an inline-block is irrelevant, and we behave
// just like a block.
if (isReplaced() && linePositionMode == PositionOnContainingLine) {
// For "leaf" theme objects, let the theme decide what the baseline position is.
// FIXME: Might be better to have a custom CSS property instead, so that if the theme
// is turned off, checkboxes/radios will still have decent baselines.
// FIXME: Need to patch form controls to deal with vertical lines.
if (style()->hasAppearance() && !theme()->isControlContainer(style()->appearance()))
return theme()->baselinePosition(this);
// CSS2.1 states that the baseline of an inline block is the baseline of the last line box in
// the normal flow. We make an exception for marquees, since their baselines are meaningless
// (the content inside them moves). This matches WinIE as well, which just bottom-aligns them.
// We also give up on finding a baseline if we have a vertical scrollbar, or if we are scrolled
// vertically (e.g., an overflow:hidden block that has had scrollTop moved) or if the baseline is outside
// of our content box.
bool ignoreBaseline = (layer() && (layer()->marquee() || (direction == HorizontalLine ? (layer()->verticalScrollbar() || layer()->scrollYOffset() != 0)
: (layer()->horizontalScrollbar() || layer()->scrollXOffset() != 0)))) || (isWritingModeRoot() && !isRubyRun());
int baselinePos = ignoreBaseline ? -1 : inlineBlockBaseline(direction);
LayoutUnit bottomOfContent = direction == HorizontalLine ? borderTop() + paddingTop() + contentHeight() : borderRight() + paddingRight() + contentWidth();
if (baselinePos != -1 && baselinePos <= bottomOfContent)
return direction == HorizontalLine ? marginTop() + baselinePos : marginRight() + baselinePos;
return RenderBox::baselinePosition(baselineType, firstLine, direction, linePositionMode);
}
const FontMetrics& fontMetrics = style(firstLine)->fontMetrics();
return fontMetrics.ascent(baselineType) + (lineHeight(firstLine, direction, linePositionMode) - fontMetrics.height()) / 2;
}
int RenderBlock::firstLineBoxBaseline() const
{
if (!isBlockFlow() || (isWritingModeRoot() && !isRubyRun()))
return -1;
if (childrenInline()) {
if (firstLineBox())
return firstLineBox()->logicalTop() + style(true)->fontMetrics().ascent(firstRootBox()->baselineType());
else
return -1;
}
else {
for (RenderBox* curr = firstChildBox(); curr; curr = curr->nextSiblingBox()) {
if (!curr->isFloatingOrOutOfFlowPositioned()) {
int result = curr->firstLineBoxBaseline();
if (result != -1)
return curr->logicalTop() + result; // Translate to our coordinate space.
}
}
}
return -1;
}
int RenderBlock::inlineBlockBaseline(LineDirectionMode direction) const
{
return lastLineBoxBaseline(direction);
}
int RenderBlock::lastLineBoxBaseline(LineDirectionMode lineDirection) const
{
if (!isBlockFlow() || (isWritingModeRoot() && !isRubyRun()))
return -1;
if (childrenInline()) {
if (!firstLineBox() && hasLineIfEmpty()) {
const FontMetrics& fontMetrics = firstLineStyle()->fontMetrics();
return fontMetrics.ascent()
+ (lineHeight(true, lineDirection, PositionOfInteriorLineBoxes) - fontMetrics.height()) / 2
+ (lineDirection == HorizontalLine ? borderTop() + paddingTop() : borderRight() + paddingRight());
}
if (lastLineBox())
return lastLineBox()->logicalTop() + style(lastLineBox() == firstLineBox())->fontMetrics().ascent(lastRootBox()->baselineType());
return -1;
} else {
bool haveNormalFlowChild = false;
for (RenderBox* curr = lastChildBox(); curr; curr = curr->previousSiblingBox()) {
if (!curr->isFloatingOrOutOfFlowPositioned()) {
haveNormalFlowChild = true;
int result = curr->inlineBlockBaseline(lineDirection);
if (result != -1)
return curr->logicalTop() + result; // Translate to our coordinate space.
}
}
if (!haveNormalFlowChild && hasLineIfEmpty()) {
const FontMetrics& fontMetrics = firstLineStyle()->fontMetrics();
return fontMetrics.ascent()
+ (lineHeight(true, lineDirection, PositionOfInteriorLineBoxes) - fontMetrics.height()) / 2
+ (lineDirection == HorizontalLine ? borderTop() + paddingTop() : borderRight() + paddingRight());
}
}
return -1;
}
bool RenderBlock::containsNonZeroBidiLevel() const
{
for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {
for (InlineBox* box = root->firstLeafChild(); box; box = box->nextLeafChild()) {
if (box->bidiLevel())
return true;
}
}
return false;
}
RenderBlock* RenderBlock::firstLineBlock() const
{
RenderBlock* firstLineBlock = const_cast<RenderBlock*>(this);
bool hasPseudo = false;
while (true) {
hasPseudo = firstLineBlock->style()->hasPseudoStyle(FIRST_LINE);
if (hasPseudo)
break;
RenderObject* parentBlock = firstLineBlock->parent();
// We include isRenderButton in this check because buttons are
// implemented using flex box but should still support first-line. The
// flex box spec requires that flex box does not support first-line,
// though.
// FIXME: Remove when buttons are implemented with align-items instead
// of flexbox.
if (firstLineBlock->isReplaced() || firstLineBlock->isFloating()
|| !parentBlock || parentBlock->firstChild() != firstLineBlock || !parentBlock->isBlockFlow()
|| (parentBlock->isFlexibleBox() && !parentBlock->isRenderButton()))
break;
ASSERT_WITH_SECURITY_IMPLICATION(parentBlock->isRenderBlock());
firstLineBlock = toRenderBlock(parentBlock);
}
if (!hasPseudo)
return 0;
return firstLineBlock;
}
static RenderStyle* styleForFirstLetter(RenderObject* firstLetterBlock, RenderObject* firstLetterContainer)
{
RenderStyle* pseudoStyle = firstLetterBlock->getCachedPseudoStyle(FIRST_LETTER, firstLetterContainer->firstLineStyle());
// Force inline display (except for floating first-letters).
pseudoStyle->setDisplay(pseudoStyle->isFloating() ? BLOCK : INLINE);
// CSS2 says first-letter can't be positioned.
pseudoStyle->setPosition(StaticPosition);
return pseudoStyle;
}
// CSS 2.1 http://www.w3.org/TR/CSS21/selector.html#first-letter
// "Punctuation (i.e, characters defined in Unicode [UNICODE] in the "open" (Ps), "close" (Pe),
// "initial" (Pi). "final" (Pf) and "other" (Po) punctuation classes), that precedes or follows the first letter should be included"
static inline bool isPunctuationForFirstLetter(UChar c)
{
CharCategory charCategory = category(c);
return charCategory == Punctuation_Open
|| charCategory == Punctuation_Close
|| charCategory == Punctuation_InitialQuote
|| charCategory == Punctuation_FinalQuote
|| charCategory == Punctuation_Other;
}
static inline bool shouldSkipForFirstLetter(UChar c)
{
return isSpaceOrNewline(c) || c == noBreakSpace || isPunctuationForFirstLetter(c);
}
static inline RenderObject* findFirstLetterBlock(RenderBlock* start)
{
RenderObject* firstLetterBlock = start;
while (true) {
// We include isRenderButton in these two checks because buttons are
// implemented using flex box but should still support first-letter.
// The flex box spec requires that flex box does not support
// first-letter, though.
// FIXME: Remove when buttons are implemented with align-items instead
// of flexbox.
bool canHaveFirstLetterRenderer = firstLetterBlock->style()->hasPseudoStyle(FIRST_LETTER)
&& firstLetterBlock->canHaveGeneratedChildren()
&& (!firstLetterBlock->isFlexibleBox() || firstLetterBlock->isRenderButton());
if (canHaveFirstLetterRenderer)
return firstLetterBlock;
RenderObject* parentBlock = firstLetterBlock->parent();
if (firstLetterBlock->isReplaced() || !parentBlock || parentBlock->firstChild() != firstLetterBlock ||
!parentBlock->isBlockFlow() || (parentBlock->isFlexibleBox() && !parentBlock->isRenderButton()))
return 0;
firstLetterBlock = parentBlock;
}
return 0;
}
void RenderBlock::updateFirstLetterStyle(RenderObject* firstLetterBlock, RenderObject* currentChild)
{
RenderObject* firstLetter = currentChild->parent();
RenderObject* firstLetterContainer = firstLetter->parent();
RenderStyle* pseudoStyle = styleForFirstLetter(firstLetterBlock, firstLetterContainer);
ASSERT(firstLetter->isFloating() || firstLetter->isInline());
if (Node::diff(firstLetter->style(), pseudoStyle, document()) == Node::Detach) {
// The first-letter renderer needs to be replaced. Create a new renderer of the right type.
RenderObject* newFirstLetter;
if (pseudoStyle->display() == INLINE)
newFirstLetter = RenderInline::createAnonymous(document());
else
newFirstLetter = RenderBlock::createAnonymous(document());
newFirstLetter->setStyle(pseudoStyle);
// Move the first letter into the new renderer.
LayoutStateDisabler layoutStateDisabler(view());
while (RenderObject* child = firstLetter->firstChild()) {
if (child->isText())
toRenderText(child)->removeAndDestroyTextBoxes();
firstLetter->removeChild(child);
newFirstLetter->addChild(child, 0);
}
RenderTextFragment* remainingText = 0;
RenderObject* nextSibling = firstLetter->nextSibling();
RenderObject* remainingTextObject = toRenderBoxModelObject(firstLetter)->firstLetterRemainingText();
if (remainingTextObject && remainingTextObject->isText() && toRenderText(remainingTextObject)->isTextFragment())
remainingText = toRenderTextFragment(remainingTextObject);
if (remainingText) {
ASSERT(remainingText->isAnonymous() || remainingText->node()->renderer() == remainingText);
// Replace the old renderer with the new one.
remainingText->setFirstLetter(newFirstLetter);
toRenderBoxModelObject(newFirstLetter)->setFirstLetterRemainingText(remainingText);
}
// To prevent removal of single anonymous block in RenderBlock::removeChild and causing
// |nextSibling| to go stale, we remove the old first letter using removeChildNode first.
firstLetterContainer->virtualChildren()->removeChildNode(firstLetterContainer, firstLetter);
firstLetter->destroy();
firstLetter = newFirstLetter;
firstLetterContainer->addChild(firstLetter, nextSibling);
} else
firstLetter->setStyle(pseudoStyle);
for (RenderObject* genChild = firstLetter->firstChild(); genChild; genChild = genChild->nextSibling()) {
if (genChild->isText())
genChild->setStyle(pseudoStyle);
}
}
void RenderBlock::createFirstLetterRenderer(RenderObject* firstLetterBlock, RenderObject* currentChild)
{
RenderObject* firstLetterContainer = currentChild->parent();
RenderStyle* pseudoStyle = styleForFirstLetter(firstLetterBlock, firstLetterContainer);
RenderObject* firstLetter = 0;
if (pseudoStyle->display() == INLINE)
firstLetter = RenderInline::createAnonymous(document());
else
firstLetter = RenderBlock::createAnonymous(document());
firstLetter->setStyle(pseudoStyle);
firstLetterContainer->addChild(firstLetter, currentChild);
RenderText* textObj = toRenderText(currentChild);
// The original string is going to be either a generated content string or a DOM node's
// string. We want the original string before it got transformed in case first-letter has
// no text-transform or a different text-transform applied to it.
RefPtr<StringImpl> oldText = textObj->originalText();
ASSERT(oldText);
if (oldText && oldText->length() > 0) {
unsigned length = 0;
// Account for leading spaces and punctuation.
while (length < oldText->length() && shouldSkipForFirstLetter((*oldText)[length]))
length++;
// Account for first letter.
length++;
// Keep looking for whitespace and allowed punctuation, but avoid
// accumulating just whitespace into the :first-letter.
for (unsigned scanLength = length; scanLength < oldText->length(); ++scanLength) {
UChar c = (*oldText)[scanLength];
if (!shouldSkipForFirstLetter(c))
break;
if (isPunctuationForFirstLetter(c))
length = scanLength + 1;
}
// Construct a text fragment for the text after the first letter.
// This text fragment might be empty.
RenderTextFragment* remainingText =
new (renderArena()) RenderTextFragment(textObj->node() ? textObj->node() : textObj->document(), oldText.get(), length, oldText->length() - length);
remainingText->setStyle(textObj->style());
if (remainingText->node())
remainingText->node()->setRenderer(remainingText);
firstLetterContainer->addChild(remainingText, textObj);
firstLetterContainer->removeChild(textObj);
remainingText->setFirstLetter(firstLetter);
toRenderBoxModelObject(firstLetter)->setFirstLetterRemainingText(remainingText);
// construct text fragment for the first letter
RenderTextFragment* letter =
new (renderArena()) RenderTextFragment(remainingText->node() ? remainingText->node() : remainingText->document(), oldText.get(), 0, length);
letter->setStyle(pseudoStyle);
firstLetter->addChild(letter);
textObj->destroy();
}
}
void RenderBlock::updateFirstLetter()
{
if (!document()->styleSheetCollection()->usesFirstLetterRules())
return;
// Don't recur
if (style()->styleType() == FIRST_LETTER)
return;
// FIXME: We need to destroy the first-letter object if it is no longer the first child. Need to find
// an efficient way to check for that situation though before implementing anything.
RenderObject* firstLetterBlock = findFirstLetterBlock(this);
if (!firstLetterBlock)
return;
// Drill into inlines looking for our first text child.
RenderObject* currChild = firstLetterBlock->firstChild();
while (currChild) {
if (currChild->isText())
break;
if (currChild->isListMarker())
currChild = currChild->nextSibling();
else if (currChild->isFloatingOrOutOfFlowPositioned()) {
if (currChild->style()->styleType() == FIRST_LETTER) {
currChild = currChild->firstChild();
break;
}
currChild = currChild->nextSibling();
} else if (currChild->isReplaced() || currChild->isRenderButton() || currChild->isMenuList())
break;
else if (currChild->style()->hasPseudoStyle(FIRST_LETTER) && currChild->canHaveGeneratedChildren()) {
// We found a lower-level node with first-letter, which supersedes the higher-level style
firstLetterBlock = currChild;
currChild = currChild->firstChild();
} else
currChild = currChild->firstChild();
}
if (!currChild)
return;
// If the child already has style, then it has already been created, so we just want
// to update it.
if (currChild->parent()->style()->styleType() == FIRST_LETTER) {
updateFirstLetterStyle(firstLetterBlock, currChild);
return;
}
if (!currChild->isText() || currChild->isBR())
return;
// Our layout state is not valid for the repaints we are going to trigger by
// adding and removing children of firstLetterContainer.
LayoutStateDisabler layoutStateDisabler(view());
createFirstLetterRenderer(firstLetterBlock, currChild);
}
// Helper methods for obtaining the last line, computing line counts and heights for line counts
// (crawling into blocks).
static bool shouldCheckLines(RenderObject* obj)
{
return !obj->isFloatingOrOutOfFlowPositioned() && !obj->isRunIn()
&& obj->isBlockFlow() && obj->style()->height().isAuto()
&& (!obj->isDeprecatedFlexibleBox() || obj->style()->boxOrient() == VERTICAL);
}
static int getHeightForLineCount(RenderBlock* block, int l, bool includeBottom, int& count)
{
if (block->style()->visibility() == VISIBLE) {
if (block->childrenInline()) {
for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {
if (++count == l)
return box->lineBottom() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : LayoutUnit());
}
}
else {
RenderBox* normalFlowChildWithoutLines = 0;
for (RenderBox* obj = block->firstChildBox(); obj; obj = obj->nextSiblingBox()) {
if (shouldCheckLines(obj)) {
int result = getHeightForLineCount(toRenderBlock(obj), l, false, count);
if (result != -1)
return result + obj->y() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : LayoutUnit());
} else if (!obj->isFloatingOrOutOfFlowPositioned() && !obj->isRunIn())
normalFlowChildWithoutLines = obj;
}
if (normalFlowChildWithoutLines && l == 0)
return normalFlowChildWithoutLines->y() + normalFlowChildWithoutLines->height();
}
}
return -1;
}
RootInlineBox* RenderBlock::lineAtIndex(int i) const
{
ASSERT(i >= 0);
if (style()->visibility() != VISIBLE)
return 0;
if (childrenInline()) {
for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())
if (!i--)
return box;
} else {
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!shouldCheckLines(child))
continue;
if (RootInlineBox* box = toRenderBlock(child)->lineAtIndex(i))
return box;
}
}
return 0;
}
int RenderBlock::lineCount(const RootInlineBox* stopRootInlineBox, bool* found) const
{
int count = 0;
if (style()->visibility() == VISIBLE) {
if (childrenInline())
for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) {
count++;
if (box == stopRootInlineBox) {
if (found)
*found = true;
break;
}
}
else
for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())
if (shouldCheckLines(obj)) {
bool recursiveFound = false;
count += toRenderBlock(obj)->lineCount(stopRootInlineBox, &recursiveFound);
if (recursiveFound) {
if (found)
*found = true;
break;
}
}
}
return count;
}
int RenderBlock::heightForLineCount(int l)
{
int count = 0;
return getHeightForLineCount(this, l, true, count);
}
void RenderBlock::adjustForBorderFit(LayoutUnit x, LayoutUnit& left, LayoutUnit& right) const
{
// We don't deal with relative positioning. Our assumption is that you shrink to fit the lines without accounting
// for either overflow or translations via relative positioning.
if (style()->visibility() == VISIBLE) {
if (childrenInline()) {
for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) {
if (box->firstChild())
left = min(left, x + static_cast<LayoutUnit>(box->firstChild()->x()));
if (box->lastChild())
right = max(right, x + static_cast<LayoutUnit>(ceilf(box->lastChild()->logicalRight())));
}
}
else {
for (RenderBox* obj = firstChildBox(); obj; obj = obj->nextSiblingBox()) {
if (!obj->isFloatingOrOutOfFlowPositioned()) {
if (obj->isBlockFlow() && !obj->hasOverflowClip())
toRenderBlock(obj)->adjustForBorderFit(x + obj->x(), left, right);
else if (obj->style()->visibility() == VISIBLE) {
// We are a replaced element or some kind of non-block-flow object.
left = min(left, x + obj->x());
right = max(right, x + obj->x() + obj->width());
}
}
}
}
if (m_floatingObjects) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
FloatingObjectSetIterator end = floatingObjectSet.end();
for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* r = *it;
// Only examine the object if our m_shouldPaint flag is set.
if (r->shouldPaint()) {
LayoutUnit floatLeft = xPositionForFloatIncludingMargin(r) - r->m_renderer->x();
LayoutUnit floatRight = floatLeft + r->m_renderer->width();
left = min(left, floatLeft);
right = max(right, floatRight);
}
}
}
}
}
void RenderBlock::fitBorderToLinesIfNeeded()
{
if (style()->borderFit() == BorderFitBorder || hasOverrideWidth())
return;
// Walk any normal flow lines to snugly fit.
LayoutUnit left = LayoutUnit::max();
LayoutUnit right = LayoutUnit::min();
LayoutUnit oldWidth = contentWidth();
adjustForBorderFit(0, left, right);
// Clamp to our existing edges. We can never grow. We only shrink.
LayoutUnit leftEdge = borderLeft() + paddingLeft();
LayoutUnit rightEdge = leftEdge + oldWidth;
left = min(rightEdge, max(leftEdge, left));
right = max(leftEdge, min(rightEdge, right));
LayoutUnit newContentWidth = right - left;
if (newContentWidth == oldWidth)
return;
setOverrideLogicalContentWidth(newContentWidth);
layoutBlock(false);
clearOverrideLogicalContentWidth();
}
void RenderBlock::clearTruncation()
{
if (style()->visibility() == VISIBLE) {
if (childrenInline() && hasMarkupTruncation()) {
setHasMarkupTruncation(false);
for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())
box->clearTruncation();
} else {
for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling()) {
if (shouldCheckLines(obj))
toRenderBlock(obj)->clearTruncation();
}
}
}
}
void RenderBlock::setMaxMarginBeforeValues(LayoutUnit pos, LayoutUnit neg)
{
if (!m_rareData) {
if (pos == RenderBlockRareData::positiveMarginBeforeDefault(this) && neg == RenderBlockRareData::negativeMarginBeforeDefault(this))
return;
m_rareData = adoptPtr(new RenderBlockRareData(this));
}
m_rareData->m_margins.setPositiveMarginBefore(pos);
m_rareData->m_margins.setNegativeMarginBefore(neg);
}
void RenderBlock::setMaxMarginAfterValues(LayoutUnit pos, LayoutUnit neg)
{
if (!m_rareData) {
if (pos == RenderBlockRareData::positiveMarginAfterDefault(this) && neg == RenderBlockRareData::negativeMarginAfterDefault(this))
return;
m_rareData = adoptPtr(new RenderBlockRareData(this));
}
m_rareData->m_margins.setPositiveMarginAfter(pos);
m_rareData->m_margins.setNegativeMarginAfter(neg);
}
void RenderBlock::setMustDiscardMarginBefore(bool value)
{
if (style()->marginBeforeCollapse() == MDISCARD) {
ASSERT(value);
return;
}
if (!m_rareData && !value)
return;
if (!m_rareData)
m_rareData = adoptPtr(new RenderBlockRareData(this));
m_rareData->m_discardMarginBefore = value;
}
void RenderBlock::setMustDiscardMarginAfter(bool value)
{
if (style()->marginAfterCollapse() == MDISCARD) {
ASSERT(value);
return;
}
if (!m_rareData && !value)
return;
if (!m_rareData)
m_rareData = adoptPtr(new RenderBlockRareData(this));
m_rareData->m_discardMarginAfter = value;
}
bool RenderBlock::mustDiscardMarginBefore() const
{
return style()->marginBeforeCollapse() == MDISCARD || (m_rareData && m_rareData->m_discardMarginBefore);
}
bool RenderBlock::mustDiscardMarginAfter() const
{
return style()->marginAfterCollapse() == MDISCARD || (m_rareData && m_rareData->m_discardMarginAfter);
}
bool RenderBlock::mustDiscardMarginBeforeForChild(const RenderBox* child) const
{
ASSERT(!child->selfNeedsLayout());
if (!child->isWritingModeRoot())
return child->isRenderBlock() ? toRenderBlock(child)->mustDiscardMarginBefore() : (child->style()->marginBeforeCollapse() == MDISCARD);
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return child->isRenderBlock() ? toRenderBlock(child)->mustDiscardMarginAfter() : (child->style()->marginAfterCollapse() == MDISCARD);
// FIXME: We return false here because the implementation is not geometrically complete. We have values only for before/after, not start/end.
// In case the boxes are perpendicular we assume the property is not specified.
return false;
}
bool RenderBlock::mustDiscardMarginAfterForChild(const RenderBox* child) const
{
ASSERT(!child->selfNeedsLayout());
if (!child->isWritingModeRoot())
return child->isRenderBlock() ? toRenderBlock(child)->mustDiscardMarginAfter() : (child->style()->marginAfterCollapse() == MDISCARD);
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return child->isRenderBlock() ? toRenderBlock(child)->mustDiscardMarginBefore() : (child->style()->marginBeforeCollapse() == MDISCARD);
// FIXME: See |mustDiscardMarginBeforeForChild| above.
return false;
}
bool RenderBlock::mustSeparateMarginBeforeForChild(const RenderBox* child) const
{
ASSERT(!child->selfNeedsLayout());
const RenderStyle* childStyle = child->style();
if (!child->isWritingModeRoot())
return childStyle->marginBeforeCollapse() == MSEPARATE;
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return childStyle->marginAfterCollapse() == MSEPARATE;
// FIXME: See |mustDiscardMarginBeforeForChild| above.
return false;
}
bool RenderBlock::mustSeparateMarginAfterForChild(const RenderBox* child) const
{
ASSERT(!child->selfNeedsLayout());
const RenderStyle* childStyle = child->style();
if (!child->isWritingModeRoot())
return childStyle->marginAfterCollapse() == MSEPARATE;
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return childStyle->marginBeforeCollapse() == MSEPARATE;
// FIXME: See |mustDiscardMarginBeforeForChild| above.
return false;
}
void RenderBlock::setPaginationStrut(LayoutUnit strut)
{
if (!m_rareData) {
if (!strut)
return;
m_rareData = adoptPtr(new RenderBlockRareData(this));
}
m_rareData->m_paginationStrut = strut;
}
void RenderBlock::setPageLogicalOffset(LayoutUnit logicalOffset)
{
if (!m_rareData) {
if (!logicalOffset)
return;
m_rareData = adoptPtr(new RenderBlockRareData(this));
}
m_rareData->m_pageLogicalOffset = logicalOffset;
}
void RenderBlock::setBreakAtLineToAvoidWidow(RootInlineBox* lineToBreak)
{
ASSERT(lineToBreak);
if (!m_rareData)
m_rareData = adoptPtr(new RenderBlockRareData(this));
m_rareData->m_shouldBreakAtLineToAvoidWidow = true;
m_rareData->m_lineBreakToAvoidWidow = lineToBreak;
}
void RenderBlock::clearShouldBreakAtLineToAvoidWidow() const
{
if (!m_rareData)
return;
m_rareData->m_shouldBreakAtLineToAvoidWidow = false;
m_rareData->m_lineBreakToAvoidWidow = 0;
}
void RenderBlock::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
// For blocks inside inlines, we go ahead and include margins so that we run right up to the
// inline boxes above and below us (thus getting merged with them to form a single irregular
// shape).
if (isAnonymousBlockContinuation()) {
// FIXME: This is wrong for block-flows that are horizontal.
// https://bugs.webkit.org/show_bug.cgi?id=46781
rects.append(pixelSnappedIntRect(accumulatedOffset.x(), accumulatedOffset.y() - collapsedMarginBefore(),
width(), height() + collapsedMarginBefore() + collapsedMarginAfter()));
continuation()->absoluteRects(rects, accumulatedOffset - toLayoutSize(location() +
inlineElementContinuation()->containingBlock()->location()));
} else
rects.append(pixelSnappedIntRect(accumulatedOffset, size()));
}
void RenderBlock::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
// For blocks inside inlines, we go ahead and include margins so that we run right up to the
// inline boxes above and below us (thus getting merged with them to form a single irregular
// shape).
if (isAnonymousBlockContinuation()) {
// FIXME: This is wrong for block-flows that are horizontal.
// https://bugs.webkit.org/show_bug.cgi?id=46781
FloatRect localRect(0, -collapsedMarginBefore(),
width(), height() + collapsedMarginBefore() + collapsedMarginAfter());
quads.append(localToAbsoluteQuad(localRect, 0 /* mode */, wasFixed));
continuation()->absoluteQuads(quads, wasFixed);
} else
quads.append(RenderBox::localToAbsoluteQuad(FloatRect(0, 0, width(), height()), 0 /* mode */, wasFixed));
}
LayoutRect RenderBlock::rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const
{
LayoutRect r(RenderBox::rectWithOutlineForRepaint(repaintContainer, outlineWidth));
if (isAnonymousBlockContinuation())
r.inflateY(collapsedMarginBefore()); // FIXME: This is wrong for block-flows that are horizontal.
return r;
}
RenderObject* RenderBlock::hoverAncestor() const
{
return isAnonymousBlockContinuation() ? continuation() : RenderBox::hoverAncestor();
}
void RenderBlock::updateDragState(bool dragOn)
{
RenderBox::updateDragState(dragOn);
if (continuation())
continuation()->updateDragState(dragOn);
}
RenderStyle* RenderBlock::outlineStyleForRepaint() const
{
return isAnonymousBlockContinuation() ? continuation()->style() : style();
}
void RenderBlock::childBecameNonInline(RenderObject*)
{
makeChildrenNonInline();
if (isAnonymousBlock() && parent() && parent()->isRenderBlock())
toRenderBlock(parent())->removeLeftoverAnonymousBlock(this);
// |this| may be dead here
}
void RenderBlock::updateHitTestResult(HitTestResult& result, const LayoutPoint& point)
{
if (result.innerNode())
return;
if (Node* n = nodeForHitTest()) {
result.setInnerNode(n);
if (!result.innerNonSharedNode())
result.setInnerNonSharedNode(n);
result.setLocalPoint(point);
}
}
LayoutRect RenderBlock::localCaretRect(InlineBox* inlineBox, int caretOffset, LayoutUnit* extraWidthToEndOfLine)
{
// Do the normal calculation in most cases.
if (firstChild())
return RenderBox::localCaretRect(inlineBox, caretOffset, extraWidthToEndOfLine);
LayoutRect caretRect = localCaretRectForEmptyElement(width(), textIndentOffset());
if (extraWidthToEndOfLine) {
if (isRenderBlock()) {
*extraWidthToEndOfLine = width() - caretRect.maxX();
} else {
// FIXME: This code looks wrong.
// myRight and containerRight are set up, but then clobbered.
// So *extraWidthToEndOfLine will always be 0 here.
LayoutUnit myRight = caretRect.maxX();
// FIXME: why call localToAbsoluteForContent() twice here, too?
FloatPoint absRightPoint = localToAbsolute(FloatPoint(myRight, 0));
LayoutUnit containerRight = containingBlock()->x() + containingBlockLogicalWidthForContent();
FloatPoint absContainerPoint = localToAbsolute(FloatPoint(containerRight, 0));
*extraWidthToEndOfLine = absContainerPoint.x() - absRightPoint.x();
}
}
return caretRect;
}
void RenderBlock::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer)
{
// For blocks inside inlines, we go ahead and include margins so that we run right up to the
// inline boxes above and below us (thus getting merged with them to form a single irregular
// shape).
if (inlineElementContinuation()) {
// FIXME: This check really isn't accurate.
bool nextInlineHasLineBox = inlineElementContinuation()->firstLineBox();
// FIXME: This is wrong. The principal renderer may not be the continuation preceding this block.
// FIXME: This is wrong for block-flows that are horizontal.
// https://bugs.webkit.org/show_bug.cgi?id=46781
bool prevInlineHasLineBox = toRenderInline(inlineElementContinuation()->node()->renderer())->firstLineBox();
float topMargin = prevInlineHasLineBox ? collapsedMarginBefore() : LayoutUnit();
float bottomMargin = nextInlineHasLineBox ? collapsedMarginAfter() : LayoutUnit();
LayoutRect rect(additionalOffset.x(), additionalOffset.y() - topMargin, width(), height() + topMargin + bottomMargin);
if (!rect.isEmpty())
rects.append(pixelSnappedIntRect(rect));
} else if (width() && height())
rects.append(pixelSnappedIntRect(additionalOffset, size()));
if (!hasOverflowClip() && !hasControlClip()) {
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
LayoutUnit top = max<LayoutUnit>(curr->lineTop(), curr->top());
LayoutUnit bottom = min<LayoutUnit>(curr->lineBottom(), curr->top() + curr->height());
LayoutRect rect(additionalOffset.x() + curr->x(), additionalOffset.y() + top, curr->width(), bottom - top);
if (!rect.isEmpty())
rects.append(pixelSnappedIntRect(rect));
}
for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {
if (!curr->isText() && !curr->isListMarker() && curr->isBox()) {
RenderBox* box = toRenderBox(curr);
FloatPoint pos;
// FIXME: This doesn't work correctly with transforms.
if (box->layer())
pos = curr->localToContainerPoint(FloatPoint(), paintContainer);
else
pos = FloatPoint(additionalOffset.x() + box->x(), additionalOffset.y() + box->y());
box->addFocusRingRects(rects, flooredLayoutPoint(pos), paintContainer);
}
}
}
if (inlineElementContinuation())
inlineElementContinuation()->addFocusRingRects(rects, flooredLayoutPoint(additionalOffset + inlineElementContinuation()->containingBlock()->location() - location()), paintContainer);
}
RenderBox* RenderBlock::createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const
{
if (isAnonymousColumnsBlock())
return createAnonymousColumnsWithParentRenderer(parent);
if (isAnonymousColumnSpanBlock())
return createAnonymousColumnSpanWithParentRenderer(parent);
return createAnonymousWithParentRendererAndDisplay(parent, style()->display());
}
bool RenderBlock::hasNextPage(LayoutUnit logicalOffset, PageBoundaryRule pageBoundaryRule) const
{
ASSERT(view()->layoutState() && view()->layoutState()->isPaginated());
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread)
return true; // Printing and multi-column both make new pages to accommodate content.
// See if we're in the last region.
LayoutUnit pageOffset = offsetFromLogicalTopOfFirstPage() + logicalOffset;
RenderRegion* region = flowThread->regionAtBlockOffset(pageOffset, this);
if (!region)
return false;
if (region->isLastRegion())
return region->isRenderRegionSet() || region->style()->regionFragment() == BreakRegionFragment
|| (pageBoundaryRule == IncludePageBoundary && pageOffset == region->logicalTopForFlowThreadContent());
return true;
}
LayoutUnit RenderBlock::nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule pageBoundaryRule) const
{
LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
if (!pageLogicalHeight)
return logicalOffset;
// The logicalOffset is in our coordinate space. We can add in our pushed offset.
LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(logicalOffset);
if (pageBoundaryRule == ExcludePageBoundary)
return logicalOffset + (remainingLogicalHeight ? remainingLogicalHeight : pageLogicalHeight);
return logicalOffset + remainingLogicalHeight;
}
static bool inNormalFlow(RenderBox* child)
{
RenderBlock* curr = child->containingBlock();
RenderView* renderView = child->view();
while (curr && curr != renderView) {
if (curr->hasColumns() || curr->isRenderFlowThread())
return true;
if (curr->isFloatingOrOutOfFlowPositioned())
return false;
curr = curr->containingBlock();
}
return true;
}
ColumnInfo::PaginationUnit RenderBlock::paginationUnit() const
{
return ColumnInfo::Column;
}
LayoutUnit RenderBlock::applyBeforeBreak(RenderBox* child, LayoutUnit logicalOffset)
{
// FIXME: Add page break checking here when we support printing.
bool checkColumnBreaks = view()->layoutState()->isPaginatingColumns();
bool checkPageBreaks = !checkColumnBreaks && view()->layoutState()->m_pageLogicalHeight; // FIXME: Once columns can print we have to check this.
RenderFlowThread* flowThread = flowThreadContainingBlock();
bool checkRegionBreaks = flowThread && flowThread->isRenderNamedFlowThread();
bool checkBeforeAlways = (checkColumnBreaks && child->style()->columnBreakBefore() == PBALWAYS) || (checkPageBreaks && child->style()->pageBreakBefore() == PBALWAYS)
|| (checkRegionBreaks && child->style()->regionBreakBefore() == PBALWAYS);
if (checkBeforeAlways && inNormalFlow(child) && hasNextPage(logicalOffset, IncludePageBoundary)) {
if (checkColumnBreaks)
view()->layoutState()->addForcedColumnBreak(child, logicalOffset);
if (checkRegionBreaks) {
LayoutUnit offsetBreakAdjustment = 0;
if (flowThread->addForcedRegionBreak(offsetFromLogicalTopOfFirstPage() + logicalOffset, child, true, &offsetBreakAdjustment))
return logicalOffset + offsetBreakAdjustment;
}
return nextPageLogicalTop(logicalOffset, IncludePageBoundary);
}
return logicalOffset;
}
LayoutUnit RenderBlock::applyAfterBreak(RenderBox* child, LayoutUnit logicalOffset, MarginInfo& marginInfo)
{
// FIXME: Add page break checking here when we support printing.
bool checkColumnBreaks = view()->layoutState()->isPaginatingColumns();
bool checkPageBreaks = !checkColumnBreaks && view()->layoutState()->m_pageLogicalHeight; // FIXME: Once columns can print we have to check this.
RenderFlowThread* flowThread = flowThreadContainingBlock();
bool checkRegionBreaks = flowThread && flowThread->isRenderNamedFlowThread();
bool checkAfterAlways = (checkColumnBreaks && child->style()->columnBreakAfter() == PBALWAYS) || (checkPageBreaks && child->style()->pageBreakAfter() == PBALWAYS)
|| (checkRegionBreaks && child->style()->regionBreakAfter() == PBALWAYS);
if (checkAfterAlways && inNormalFlow(child) && hasNextPage(logicalOffset, IncludePageBoundary)) {
LayoutUnit marginOffset = marginInfo.canCollapseWithMarginBefore() ? LayoutUnit() : marginInfo.margin();
// So our margin doesn't participate in the next collapsing steps.
marginInfo.clearMargin();
if (checkColumnBreaks)
view()->layoutState()->addForcedColumnBreak(child, logicalOffset);
if (checkRegionBreaks) {
LayoutUnit offsetBreakAdjustment = 0;
if (flowThread->addForcedRegionBreak(offsetFromLogicalTopOfFirstPage() + logicalOffset + marginOffset, child, false, &offsetBreakAdjustment))
return logicalOffset + marginOffset + offsetBreakAdjustment;
}
return nextPageLogicalTop(logicalOffset, IncludePageBoundary);
}
return logicalOffset;
}
LayoutUnit RenderBlock::pageLogicalTopForOffset(LayoutUnit offset) const
{
RenderView* renderView = view();
LayoutUnit firstPageLogicalTop = isHorizontalWritingMode() ? renderView->layoutState()->m_pageOffset.height() : renderView->layoutState()->m_pageOffset.width();
LayoutUnit blockLogicalTop = isHorizontalWritingMode() ? renderView->layoutState()->m_layoutOffset.height() : renderView->layoutState()->m_layoutOffset.width();
LayoutUnit cumulativeOffset = offset + blockLogicalTop;
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread) {
LayoutUnit pageLogicalHeight = renderView->layoutState()->pageLogicalHeight();
if (!pageLogicalHeight)
return 0;
return cumulativeOffset - roundToInt(cumulativeOffset - firstPageLogicalTop) % roundToInt(pageLogicalHeight);
}
return flowThread->pageLogicalTopForOffset(cumulativeOffset);
}
LayoutUnit RenderBlock::pageLogicalHeightForOffset(LayoutUnit offset) const
{
RenderView* renderView = view();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread)
return renderView->layoutState()->m_pageLogicalHeight;
return flowThread->pageLogicalHeightForOffset(offset + offsetFromLogicalTopOfFirstPage());
}
LayoutUnit RenderBlock::pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule pageBoundaryRule) const
{
RenderView* renderView = view();
offset += offsetFromLogicalTopOfFirstPage();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread) {
LayoutUnit pageLogicalHeight = renderView->layoutState()->m_pageLogicalHeight;
LayoutUnit remainingHeight = pageLogicalHeight - intMod(offset, pageLogicalHeight);
if (pageBoundaryRule == IncludePageBoundary) {
// If includeBoundaryPoint is true the line exactly on the top edge of a
// column will act as being part of the previous column.
remainingHeight = intMod(remainingHeight, pageLogicalHeight);
}
return remainingHeight;
}
return flowThread->pageRemainingLogicalHeightForOffset(offset, pageBoundaryRule);
}
LayoutUnit RenderBlock::adjustForUnsplittableChild(RenderBox* child, LayoutUnit logicalOffset, bool includeMargins)
{
bool checkColumnBreaks = view()->layoutState()->isPaginatingColumns();
bool checkPageBreaks = !checkColumnBreaks && view()->layoutState()->m_pageLogicalHeight;
RenderFlowThread* flowThread = flowThreadContainingBlock();
bool checkRegionBreaks = flowThread && flowThread->isRenderNamedFlowThread();
bool isUnsplittable = child->isUnsplittableForPagination() || (checkColumnBreaks && child->style()->columnBreakInside() == PBAVOID)
|| (checkPageBreaks && child->style()->pageBreakInside() == PBAVOID)
|| (checkRegionBreaks && child->style()->regionBreakInside() == PBAVOID);
if (!isUnsplittable)
return logicalOffset;
LayoutUnit childLogicalHeight = logicalHeightForChild(child) + (includeMargins ? marginBeforeForChild(child) + marginAfterForChild(child) : LayoutUnit());
LayoutState* layoutState = view()->layoutState();
if (layoutState->m_columnInfo)
layoutState->m_columnInfo->updateMinimumColumnHeight(childLogicalHeight);
LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
bool hasUniformPageLogicalHeight = !flowThread || flowThread->regionsHaveUniformLogicalHeight();
if (!pageLogicalHeight || (hasUniformPageLogicalHeight && childLogicalHeight > pageLogicalHeight)
|| !hasNextPage(logicalOffset))
return logicalOffset;
LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(logicalOffset, ExcludePageBoundary);
if (remainingLogicalHeight < childLogicalHeight) {
if (!hasUniformPageLogicalHeight && !pushToNextPageWithMinimumLogicalHeight(remainingLogicalHeight, logicalOffset, childLogicalHeight))
return logicalOffset;
return logicalOffset + remainingLogicalHeight;
}
return logicalOffset;
}
bool RenderBlock::pushToNextPageWithMinimumLogicalHeight(LayoutUnit& adjustment, LayoutUnit logicalOffset, LayoutUnit minimumLogicalHeight) const
{
bool checkRegion = false;
for (LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset + adjustment); pageLogicalHeight;
pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset + adjustment)) {
if (minimumLogicalHeight <= pageLogicalHeight)
return true;
if (!hasNextPage(logicalOffset + adjustment))
return false;
adjustment += pageLogicalHeight;
checkRegion = true;
}
return !checkRegion;
}
void RenderBlock::adjustLinePositionForPagination(RootInlineBox* lineBox, LayoutUnit& delta, RenderFlowThread* flowThread)
{
// FIXME: For now we paginate using line overflow. This ensures that lines don't overlap at all when we
// put a strut between them for pagination purposes. However, this really isn't the desired rendering, since
// the line on the top of the next page will appear too far down relative to the same kind of line at the top
// of the first column.
//
// The rendering we would like to see is one where the lineTopWithLeading is at the top of the column, and any line overflow
// simply spills out above the top of the column. This effect would match what happens at the top of the first column.
// We can't achieve this rendering, however, until we stop columns from clipping to the column bounds (thus allowing
// for overflow to occur), and then cache visible overflow for each column rect.
//
// Furthermore, the paint we have to do when a column has overflow has to be special. We need to exclude
// content that paints in a previous column (and content that paints in the following column).
//
// For now we'll at least honor the lineTopWithLeading when paginating if it is above the logical top overflow. This will
// at least make positive leading work in typical cases.
//
// FIXME: Another problem with simply moving lines is that the available line width may change (because of floats).
// Technically if the location we move the line to has a different line width than our old position, then we need to dirty the
// line and all following lines.
LayoutRect logicalVisualOverflow = lineBox->logicalVisualOverflowRect(lineBox->lineTop(), lineBox->lineBottom());
LayoutUnit logicalOffset = min(lineBox->lineTopWithLeading(), logicalVisualOverflow.y());
LayoutUnit lineHeight = max(lineBox->lineBottomWithLeading(), logicalVisualOverflow.maxY()) - logicalOffset;
RenderView* renderView = view();
LayoutState* layoutState = renderView->layoutState();
if (layoutState->m_columnInfo)
layoutState->m_columnInfo->updateMinimumColumnHeight(lineHeight);
logicalOffset += delta;
lineBox->setPaginationStrut(0);
lineBox->setIsFirstAfterPageBreak(false);
LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
bool hasUniformPageLogicalHeight = !flowThread || flowThread->regionsHaveUniformLogicalHeight();
// If lineHeight is greater than pageLogicalHeight, but logicalVisualOverflow.height() still fits, we are
// still going to add a strut, so that the visible overflow fits on a single page.
if (!pageLogicalHeight || (hasUniformPageLogicalHeight && logicalVisualOverflow.height() > pageLogicalHeight)
|| !hasNextPage(logicalOffset))
return;
LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(logicalOffset, ExcludePageBoundary);
if (remainingLogicalHeight < lineHeight || (shouldBreakAtLineToAvoidWidow() && lineBreakToAvoidWidow() == lineBox)) {
if (shouldBreakAtLineToAvoidWidow() && lineBreakToAvoidWidow() == lineBox)
clearShouldBreakAtLineToAvoidWidow();
// If we have a non-uniform page height, then we have to shift further possibly.
if (!hasUniformPageLogicalHeight && !pushToNextPageWithMinimumLogicalHeight(remainingLogicalHeight, logicalOffset, lineHeight))
return;
if (lineHeight > pageLogicalHeight) {
// Split the top margin in order to avoid splitting the visible part of the line.
remainingLogicalHeight -= min(lineHeight - pageLogicalHeight, max<LayoutUnit>(0, logicalVisualOverflow.y() - lineBox->lineTopWithLeading()));
}
LayoutUnit totalLogicalHeight = lineHeight + max<LayoutUnit>(0, logicalOffset);
LayoutUnit pageLogicalHeightAtNewOffset = hasUniformPageLogicalHeight ? pageLogicalHeight : pageLogicalHeightForOffset(logicalOffset + remainingLogicalHeight);
if (((lineBox == firstRootBox() && totalLogicalHeight < pageLogicalHeightAtNewOffset) || (!style()->hasAutoOrphans() && style()->orphans() >= lineCount(lineBox)))
&& !isOutOfFlowPositioned() && !isTableCell())
setPaginationStrut(remainingLogicalHeight + max<LayoutUnit>(0, logicalOffset));
else {
delta += remainingLogicalHeight;
lineBox->setPaginationStrut(remainingLogicalHeight);
lineBox->setIsFirstAfterPageBreak(true);
}
} else if (remainingLogicalHeight == pageLogicalHeight && lineBox != firstRootBox())
lineBox->setIsFirstAfterPageBreak(true);
}
LayoutUnit RenderBlock::adjustBlockChildForPagination(LayoutUnit logicalTopAfterClear, LayoutUnit estimateWithoutPagination, RenderBox* child, bool atBeforeSideOfBlock)
{
RenderBlock* childRenderBlock = child->isRenderBlock() ? toRenderBlock(child) : 0;
if (estimateWithoutPagination != logicalTopAfterClear) {
// Our guess prior to pagination movement was wrong. Before we attempt to paginate, let's try again at the new
// position.
setLogicalHeight(logicalTopAfterClear);
setLogicalTopForChild(child, logicalTopAfterClear, ApplyLayoutDelta);
if (child->shrinkToAvoidFloats()) {
// The child's width depends on the line width.
// When the child shifts to clear an item, its width can
// change (because it has more available line width).
// So go ahead and mark the item as dirty.
child->setChildNeedsLayout(true, MarkOnlyThis);
}
if (childRenderBlock) {
if (!child->avoidsFloats() && childRenderBlock->containsFloats())
childRenderBlock->markAllDescendantsWithFloatsForLayout();
if (!child->needsLayout())
child->markForPaginationRelayoutIfNeeded();
}
// Our guess was wrong. Make the child lay itself out again.
child->layoutIfNeeded();
}
LayoutUnit oldTop = logicalTopAfterClear;
// If the object has a page or column break value of "before", then we should shift to the top of the next page.
LayoutUnit result = applyBeforeBreak(child, logicalTopAfterClear);
// For replaced elements and scrolled elements, we want to shift them to the next page if they don't fit on the current one.
LayoutUnit logicalTopBeforeUnsplittableAdjustment = result;
LayoutUnit logicalTopAfterUnsplittableAdjustment = adjustForUnsplittableChild(child, result);
LayoutUnit paginationStrut = 0;
LayoutUnit unsplittableAdjustmentDelta = logicalTopAfterUnsplittableAdjustment - logicalTopBeforeUnsplittableAdjustment;
if (unsplittableAdjustmentDelta)
paginationStrut = unsplittableAdjustmentDelta;
else if (childRenderBlock && childRenderBlock->paginationStrut())
paginationStrut = childRenderBlock->paginationStrut();
if (paginationStrut) {
// We are willing to propagate out to our parent block as long as we were at the top of the block prior
// to collapsing our margins, and as long as we didn't clear or move as a result of other pagination.
if (atBeforeSideOfBlock && oldTop == result && !isOutOfFlowPositioned() && !isTableCell()) {
// FIXME: Should really check if we're exceeding the page height before propagating the strut, but we don't
// have all the information to do so (the strut only has the remaining amount to push). Gecko gets this wrong too
// and pushes to the next page anyway, so not too concerned about it.
setPaginationStrut(result + paginationStrut);
if (childRenderBlock)
childRenderBlock->setPaginationStrut(0);
} else
result += paginationStrut;
}
// Similar to how we apply clearance. Go ahead and boost height() to be the place where we're going to position the child.
setLogicalHeight(logicalHeight() + (result - oldTop));
// Return the final adjusted logical top.
return result;
}
bool RenderBlock::lineWidthForPaginatedLineChanged(RootInlineBox* rootBox, LayoutUnit lineDelta, RenderFlowThread* flowThread) const
{
if (!flowThread)
return false;
RenderRegion* currentRegion = regionAtBlockOffset(rootBox->lineTopWithLeading() + lineDelta);
// Just bail if the region didn't change.
if (rootBox->containingRegion() == currentRegion)
return false;
return rootBox->paginatedLineWidth() != availableLogicalWidthForContent(currentRegion);
}
LayoutUnit RenderBlock::offsetFromLogicalTopOfFirstPage() const
{
LayoutState* layoutState = view()->layoutState();
if (layoutState && !layoutState->isPaginated())
return 0;
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
return flowThread->offsetFromLogicalTopOfFirstRegion(this);
if (layoutState) {
ASSERT(layoutState->m_renderer == this);
LayoutSize offsetDelta = layoutState->m_layoutOffset - layoutState->m_pageOffset;
return isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.width();
}
ASSERT_NOT_REACHED();
return 0;
}
RenderRegion* RenderBlock::regionAtBlockOffset(LayoutUnit blockOffset) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread || !flowThread->hasValidRegionInfo())
return 0;
return flowThread->regionAtBlockOffset(offsetFromLogicalTopOfFirstPage() + blockOffset, true);
}
void RenderBlock::updateStaticInlinePositionForChild(RenderBox* child, LayoutUnit logicalTop)
{
if (child->style()->isOriginalDisplayInlineType())
setStaticInlinePositionForChild(child, logicalTop, startAlignedOffsetForLine(logicalTop, false));
else
setStaticInlinePositionForChild(child, logicalTop, startOffsetForContent(logicalTop));
}
void RenderBlock::setStaticInlinePositionForChild(RenderBox* child, LayoutUnit blockOffset, LayoutUnit inlinePosition)
{
if (flowThreadContainingBlock()) {
// Shift the inline position to exclude the region offset.
inlinePosition += startOffsetForContent() - startOffsetForContent(blockOffset);
}
child->layer()->setStaticInlinePosition(inlinePosition);
}
bool RenderBlock::logicalWidthChangedInRegions(RenderFlowThread* flowThread) const
{
if (!flowThread || !flowThread->hasValidRegionInfo())
return false;
return flowThread->logicalWidthChangedInRegionsForBlock(this);
}
RenderRegion* RenderBlock::clampToStartAndEndRegions(RenderRegion* region) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
ASSERT(isRenderView() || (region && flowThread));
if (isRenderView())
return region;
// We need to clamp to the block, since we want any lines or blocks that overflow out of the
// logical top or logical bottom of the block to size as though the border box in the first and
// last regions extended infinitely. Otherwise the lines are going to size according to the regions
// they overflow into, which makes no sense when this block doesn't exist in |region| at all.
RenderRegion* startRegion;
RenderRegion* endRegion;
flowThread->getRegionRangeForBox(this, startRegion, endRegion);
if (startRegion && region->logicalTopForFlowThreadContent() < startRegion->logicalTopForFlowThreadContent())
return startRegion;
if (endRegion && region->logicalTopForFlowThreadContent() > endRegion->logicalTopForFlowThreadContent())
return endRegion;
return region;
}
LayoutUnit RenderBlock::collapsedMarginBeforeForChild(const RenderBox* child) const
{
// If the child has the same directionality as we do, then we can just return its
// collapsed margin.
if (!child->isWritingModeRoot())
return child->collapsedMarginBefore();
// The child has a different directionality. If the child is parallel, then it's just
// flipped relative to us. We can use the collapsed margin for the opposite edge.
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return child->collapsedMarginAfter();
// The child is perpendicular to us, which means its margins don't collapse but are on the
// "logical left/right" sides of the child box. We can just return the raw margin in this case.
return marginBeforeForChild(child);
}
LayoutUnit RenderBlock::collapsedMarginAfterForChild(const RenderBox* child) const
{
// If the child has the same directionality as we do, then we can just return its
// collapsed margin.
if (!child->isWritingModeRoot())
return child->collapsedMarginAfter();
// The child has a different directionality. If the child is parallel, then it's just
// flipped relative to us. We can use the collapsed margin for the opposite edge.
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return child->collapsedMarginBefore();
// The child is perpendicular to us, which means its margins don't collapse but are on the
// "logical left/right" side of the child box. We can just return the raw margin in this case.
return marginAfterForChild(child);
}
bool RenderBlock::hasMarginBeforeQuirk(const RenderBox* child) const
{
// If the child has the same directionality as we do, then we can just return its
// margin quirk.
if (!child->isWritingModeRoot())
return child->isRenderBlock() ? toRenderBlock(child)->hasMarginBeforeQuirk() : child->style()->hasMarginBeforeQuirk();
// The child has a different directionality. If the child is parallel, then it's just
// flipped relative to us. We can use the opposite edge.
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return child->isRenderBlock() ? toRenderBlock(child)->hasMarginAfterQuirk() : child->style()->hasMarginAfterQuirk();
// The child is perpendicular to us and box sides are never quirky in html.css, and we don't really care about
// whether or not authors specified quirky ems, since they're an implementation detail.
return false;
}
bool RenderBlock::hasMarginAfterQuirk(const RenderBox* child) const
{
// If the child has the same directionality as we do, then we can just return its
// margin quirk.
if (!child->isWritingModeRoot())
return child->isRenderBlock() ? toRenderBlock(child)->hasMarginAfterQuirk() : child->style()->hasMarginAfterQuirk();
// The child has a different directionality. If the child is parallel, then it's just
// flipped relative to us. We can use the opposite edge.
if (child->isHorizontalWritingMode() == isHorizontalWritingMode())
return child->isRenderBlock() ? toRenderBlock(child)->hasMarginBeforeQuirk() : child->style()->hasMarginBeforeQuirk();
// The child is perpendicular to us and box sides are never quirky in html.css, and we don't really care about
// whether or not authors specified quirky ems, since they're an implementation detail.
return false;
}
RenderBlock::MarginValues RenderBlock::marginValuesForChild(RenderBox* child) const
{
LayoutUnit childBeforePositive = 0;
LayoutUnit childBeforeNegative = 0;
LayoutUnit childAfterPositive = 0;
LayoutUnit childAfterNegative = 0;
LayoutUnit beforeMargin = 0;
LayoutUnit afterMargin = 0;
RenderBlock* childRenderBlock = child->isRenderBlock() ? toRenderBlock(child) : 0;
// If the child has the same directionality as we do, then we can just return its
// margins in the same direction.
if (!child->isWritingModeRoot()) {
if (childRenderBlock) {
childBeforePositive = childRenderBlock->maxPositiveMarginBefore();
childBeforeNegative = childRenderBlock->maxNegativeMarginBefore();
childAfterPositive = childRenderBlock->maxPositiveMarginAfter();
childAfterNegative = childRenderBlock->maxNegativeMarginAfter();
} else {
beforeMargin = child->marginBefore();
afterMargin = child->marginAfter();
}
} else if (child->isHorizontalWritingMode() == isHorizontalWritingMode()) {
// The child has a different directionality. If the child is parallel, then it's just
// flipped relative to us. We can use the margins for the opposite edges.
if (childRenderBlock) {
childBeforePositive = childRenderBlock->maxPositiveMarginAfter();
childBeforeNegative = childRenderBlock->maxNegativeMarginAfter();
childAfterPositive = childRenderBlock->maxPositiveMarginBefore();
childAfterNegative = childRenderBlock->maxNegativeMarginBefore();
} else {
beforeMargin = child->marginAfter();
afterMargin = child->marginBefore();
}
} else {
// The child is perpendicular to us, which means its margins don't collapse but are on the
// "logical left/right" sides of the child box. We can just return the raw margin in this case.
beforeMargin = marginBeforeForChild(child);
afterMargin = marginAfterForChild(child);
}
// Resolve uncollapsing margins into their positive/negative buckets.
if (beforeMargin) {
if (beforeMargin > 0)
childBeforePositive = beforeMargin;
else
childBeforeNegative = -beforeMargin;
}
if (afterMargin) {
if (afterMargin > 0)
childAfterPositive = afterMargin;
else
childAfterNegative = -afterMargin;
}
return MarginValues(childBeforePositive, childBeforeNegative, childAfterPositive, childAfterNegative);
}
const char* RenderBlock::renderName() const
{
if (isBody())
return "RenderBody"; // FIXME: Temporary hack until we know that the regression tests pass.
if (isFloating())
return "RenderBlock (floating)";
if (isOutOfFlowPositioned())
return "RenderBlock (positioned)";
if (isAnonymousColumnsBlock())
return "RenderBlock (anonymous multi-column)";
if (isAnonymousColumnSpanBlock())
return "RenderBlock (anonymous multi-column span)";
if (isAnonymousBlock())
return "RenderBlock (anonymous)";
// FIXME: Temporary hack while the new generated content system is being implemented.
if (isPseudoElement())
return "RenderBlock (generated)";
if (isAnonymous())
return "RenderBlock (generated)";
if (isRelPositioned())
return "RenderBlock (relative positioned)";
if (isStickyPositioned())
return "RenderBlock (sticky positioned)";
if (isRunIn())
return "RenderBlock (run-in)";
return "RenderBlock";
}
inline RenderBlock::FloatingObjects::FloatingObjects(const RenderBlock* renderer, bool horizontalWritingMode)
: m_placedFloatsTree(UninitializedTree)
, m_leftObjectsCount(0)
, m_rightObjectsCount(0)
, m_horizontalWritingMode(horizontalWritingMode)
, m_renderer(renderer)
{
}
void RenderBlock::createFloatingObjects()
{
m_floatingObjects = adoptPtr(new FloatingObjects(this, isHorizontalWritingMode()));
}
inline void RenderBlock::FloatingObjects::clear()
{
m_set.clear();
m_placedFloatsTree.clear();
m_leftObjectsCount = 0;
m_rightObjectsCount = 0;
}
inline void RenderBlock::FloatingObjects::increaseObjectsCount(FloatingObject::Type type)
{
if (type == FloatingObject::FloatLeft)
m_leftObjectsCount++;
else
m_rightObjectsCount++;
}
inline void RenderBlock::FloatingObjects::decreaseObjectsCount(FloatingObject::Type type)
{
if (type == FloatingObject::FloatLeft)
m_leftObjectsCount--;
else
m_rightObjectsCount--;
}
inline RenderBlock::FloatingObjectInterval RenderBlock::FloatingObjects::intervalForFloatingObject(FloatingObject* floatingObject)
{
if (m_horizontalWritingMode)
return RenderBlock::FloatingObjectInterval(floatingObject->frameRect().y(), floatingObject->frameRect().maxY(), floatingObject);
return RenderBlock::FloatingObjectInterval(floatingObject->frameRect().x(), floatingObject->frameRect().maxX(), floatingObject);
}
void RenderBlock::FloatingObjects::addPlacedObject(FloatingObject* floatingObject)
{
ASSERT(!floatingObject->isInPlacedTree());
floatingObject->setIsPlaced(true);
if (m_placedFloatsTree.isInitialized())
m_placedFloatsTree.add(intervalForFloatingObject(floatingObject));
#ifndef NDEBUG
floatingObject->setIsInPlacedTree(true);
#endif
}
void RenderBlock::FloatingObjects::removePlacedObject(FloatingObject* floatingObject)
{
ASSERT(floatingObject->isPlaced() && floatingObject->isInPlacedTree());
if (m_placedFloatsTree.isInitialized()) {
bool removed = m_placedFloatsTree.remove(intervalForFloatingObject(floatingObject));
ASSERT_UNUSED(removed, removed);
}
floatingObject->setIsPlaced(false);
#ifndef NDEBUG
floatingObject->setIsInPlacedTree(false);
#endif
}
inline void RenderBlock::FloatingObjects::add(FloatingObject* floatingObject)
{
increaseObjectsCount(floatingObject->type());
m_set.add(floatingObject);
if (floatingObject->isPlaced())
addPlacedObject(floatingObject);
}
inline void RenderBlock::FloatingObjects::remove(FloatingObject* floatingObject)
{
decreaseObjectsCount(floatingObject->type());
m_set.remove(floatingObject);
ASSERT(floatingObject->isPlaced() || !floatingObject->isInPlacedTree());
if (floatingObject->isPlaced())
removePlacedObject(floatingObject);
}
void RenderBlock::FloatingObjects::computePlacedFloatsTree()
{
ASSERT(!m_placedFloatsTree.isInitialized());
if (m_set.isEmpty())
return;
m_placedFloatsTree.initIfNeeded(m_renderer->view()->intervalArena());
FloatingObjectSetIterator it = m_set.begin();
FloatingObjectSetIterator end = m_set.end();
for (; it != end; ++it) {
FloatingObject* floatingObject = *it;
if (floatingObject->isPlaced())
m_placedFloatsTree.add(intervalForFloatingObject(floatingObject));
}
}
template <typename CharacterType>
static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextRun::ExpansionBehavior expansion)
{
ASSERT(style);
TextDirection textDirection = LTR;
bool directionalOverride = style->rtlOrdering() == VisualOrder;
TextRun run(characters, length, 0, 0, expansion, textDirection, directionalOverride);
if (textRunNeedsRenderingContext(font))
run.setRenderingContext(SVGTextRunRenderingContext::create(context));
return run;
}
template <typename CharacterType>
static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
{
ASSERT(style);
TextDirection textDirection = LTR;
bool directionalOverride = style->rtlOrdering() == VisualOrder;
if (flags != DefaultTextRunFlags) {
if (flags & RespectDirection)
textDirection = style->direction();
if (flags & RespectDirectionOverride)
directionalOverride |= isOverride(style->unicodeBidi());
}
TextRun run(characters, length, 0, 0, expansion, textDirection, directionalOverride);
if (textRunNeedsRenderingContext(font))
run.setRenderingContext(SVGTextRunRenderingContext::create(context));
return run;
}
#if ENABLE(8BIT_TEXTRUN)
TextRun RenderBlock::constructTextRun(RenderObject* context, const Font& font, const LChar* characters, int length, RenderStyle* style, TextRun::ExpansionBehavior expansion)
{
return constructTextRunInternal(context, font, characters, length, style, expansion);
}
#endif
TextRun RenderBlock::constructTextRun(RenderObject* context, const Font& font, const UChar* characters, int length, RenderStyle* style, TextRun::ExpansionBehavior expansion)
{
return constructTextRunInternal(context, font, characters, length, style, expansion);
}
TextRun RenderBlock::constructTextRun(RenderObject* context, const Font& font, const RenderText* text, RenderStyle* style, TextRun::ExpansionBehavior expansion)
{
#if ENABLE(8BIT_TEXTRUN)
if (text->is8Bit())
return constructTextRunInternal(context, font, text->characters8(), text->textLength(), style, expansion);
return constructTextRunInternal(context, font, text->characters16(), text->textLength(), style, expansion);
#else
return constructTextRunInternal(context, font, text->characters(), text->textLength(), style, expansion);
#endif
}
TextRun RenderBlock::constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style, TextRun::ExpansionBehavior expansion)
{
ASSERT(offset + length <= text->textLength());
#if ENABLE(8BIT_TEXTRUN)
if (text->is8Bit())
return constructTextRunInternal(context, font, text->characters8() + offset, length, style, expansion);
return constructTextRunInternal(context, font, text->characters16() + offset, length, style, expansion);
#else
return constructTextRunInternal(context, font, text->characters() + offset, length, style, expansion);
#endif
}
TextRun RenderBlock::constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
{
unsigned length = string.length();
#if ENABLE(8BIT_TEXTRUN)
if (length && string.is8Bit())
return constructTextRunInternal(context, font, string.characters8(), length, style, expansion, flags);
return constructTextRunInternal(context, font, string.characters(), length, style, expansion, flags);
#else
return constructTextRunInternal(context, font, string.characters(), length, style, expansion, flags);
#endif
}
RenderBlock* RenderBlock::createAnonymousWithParentRendererAndDisplay(const RenderObject* parent, EDisplay display)
{
// FIXME: Do we need to convert all our inline displays to block-type in the anonymous logic ?
EDisplay newDisplay;
RenderBlock* newBox = 0;
if (display == BOX || display == INLINE_BOX) {
// FIXME: Remove this case once we have eliminated all internal users of old flexbox
newBox = RenderDeprecatedFlexibleBox::createAnonymous(parent->document());
newDisplay = BOX;
} else if (display == FLEX || display == INLINE_FLEX) {
newBox = RenderFlexibleBox::createAnonymous(parent->document());
newDisplay = FLEX;
} else {
newBox = RenderBlock::createAnonymous(parent->document());
newDisplay = BLOCK;
}
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), newDisplay);
newBox->setStyle(newStyle.release());
return newBox;
}
RenderBlock* RenderBlock::createAnonymousColumnsWithParentRenderer(const RenderObject* parent)
{
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), BLOCK);
newStyle->inheritColumnPropertiesFrom(parent->style());
RenderBlock* newBox = RenderBlock::createAnonymous(parent->document());
newBox->setStyle(newStyle.release());
return newBox;
}
RenderBlock* RenderBlock::createAnonymousColumnSpanWithParentRenderer(const RenderObject* parent)
{
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), BLOCK);
newStyle->setColumnSpan(ColumnSpanAll);
RenderBlock* newBox = RenderBlock::createAnonymous(parent->document());
newBox->setStyle(newStyle.release());
return newBox;
}
#ifndef NDEBUG
void RenderBlock::checkPositionedObjectsNeedLayout()
{
if (!gPositionedDescendantsMap)
return;
if (TrackedRendererListHashSet* positionedDescendantSet = positionedObjects()) {
TrackedRendererListHashSet::const_iterator end = positionedDescendantSet->end();
for (TrackedRendererListHashSet::const_iterator it = positionedDescendantSet->begin(); it != end; ++it) {
RenderBox* currBox = *it;
ASSERT(!currBox->needsLayout());
}
}
}
void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
{
showRenderObject();
for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
}
// These helpers are only used by the PODIntervalTree for debugging purposes.
String ValueToString<int>::string(const int value)
{
return String::number(value);
}
String ValueToString<RenderBlock::FloatingObject*>::string(const RenderBlock::FloatingObject* floatingObject)
{
return String::format("%p (%ix%i %ix%i)", floatingObject, floatingObject->frameRect().x().toInt(), floatingObject->frameRect().y().toInt(), floatingObject->frameRect().maxX().toInt(), floatingObject->frameRect().maxY().toInt());
}
#endif
} // namespace WebCore