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webkit / WebKit / 454418f4b51e9752e57d926bfb0d6be2df29e755 / . / Source / WebCore / rendering / RenderBlock.cpp
blob: 788b3f31368e1629847a27e0f0f75aed7dd144f4 [file] [log] [blame]
/*
* 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 "Document.h"
#include "Editor.h"
#include "Element.h"
#include "FloatQuad.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HitTestLocation.h"
#include "HitTestResult.h"
#include "InlineElementBox.h"
#include "InlineIterator.h"
#include "InlineTextBox.h"
#include "LayoutRepainter.h"
#include "LogicalSelectionOffsetCaches.h"
#include "OverflowEvent.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderBlockFlow.h"
#include "RenderBoxRegionInfo.h"
#include "RenderButton.h"
#include "RenderCombineText.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderFlexibleBox.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderListMarker.h"
#include "RenderMenuList.h"
#include "RenderNamedFlowFragment.h"
#include "RenderNamedFlowThread.h"
#include "RenderRegion.h"
#include "RenderSVGResourceClipper.h"
#include "RenderTableCell.h"
#include "RenderTextFragment.h"
#include "RenderTheme.h"
#include "RenderTreePosition.h"
#include "RenderView.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "TextBreakIterator.h"
#include "TransformState.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/Optional.h>
#include <wtf/StackStats.h>
#include <wtf/TemporaryChange.h>
#if ENABLE(CSS_SHAPES)
#include "ShapeOutsideInfo.h"
#endif
using namespace WTF;
using namespace Unicode;
namespace WebCore {
using namespace HTMLNames;
struct SameSizeAsRenderBlock : public RenderBox {
};
COMPILE_ASSERT(sizeof(RenderBlock) == sizeof(SameSizeAsRenderBlock), RenderBlock_should_stay_small);
static TrackedDescendantsMap* gPositionedDescendantsMap;
static TrackedDescendantsMap* gPercentHeightDescendantsMap;
static TrackedContainerMap* gPositionedContainerMap;
static TrackedContainerMap* gPercentHeightContainerMap;
typedef HashMap<RenderBlock*, std::unique_ptr<ListHashSet<RenderInline*>>> ContinuationOutlineTableMap;
struct UpdateScrollInfoAfterLayoutTransaction {
UpdateScrollInfoAfterLayoutTransaction(const RenderView& view)
: nestedCount(0)
, view(&view)
{
}
int nestedCount;
const RenderView* view;
HashSet<RenderBlock*> blocks;
};
typedef Vector<UpdateScrollInfoAfterLayoutTransaction> DelayedUpdateScrollInfoStack;
static std::unique_ptr<DelayedUpdateScrollInfoStack>& updateScrollInfoAfterLayoutTransactionStack()
{
static NeverDestroyed<std::unique_ptr<DelayedUpdateScrollInfoStack>> delayedUpdatedScrollInfoStack;
return delayedUpdatedScrollInfoStack;
}
// Allocated only when some of these fields have non-default values
struct RenderBlockRareData {
WTF_MAKE_NONCOPYABLE(RenderBlockRareData); WTF_MAKE_FAST_ALLOCATED;
public:
RenderBlockRareData()
: m_paginationStrut(0)
, m_pageLogicalOffset(0)
, m_flowThreadContainingBlock(Nullopt)
{
}
LayoutUnit m_paginationStrut;
LayoutUnit m_pageLogicalOffset;
Optional<RenderFlowThread*> m_flowThreadContainingBlock;
};
typedef HashMap<const RenderBlock*, std::unique_ptr<RenderBlockRareData>> RenderBlockRareDataMap;
static RenderBlockRareDataMap* gRareDataMap = 0;
// 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)
return;
Ref<OverflowEvent> overflowEvent = OverflowEvent::create(horizontalLayoutOverflowChanged, hasHorizontalLayoutOverflow, verticalLayoutOverflowChanged, hasVerticalLayoutOverflow);
overflowEvent->setTarget(m_block->element());
m_block->document().enqueueOverflowEvent(WTFMove(overflowEvent));
}
private:
const RenderBlock* m_block;
bool m_shouldDispatchEvent;
bool m_hadHorizontalLayoutOverflow;
bool m_hadVerticalLayoutOverflow;
};
RenderBlock::RenderBlock(Element& element, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderBox(element, WTFMove(style), baseTypeFlags | RenderBlockFlag)
{
}
RenderBlock::RenderBlock(Document& document, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderBox(document, WTFMove(style), baseTypeFlags | RenderBlockFlag)
{
}
static void removeBlockFromDescendantAndContainerMaps(RenderBlock* block, TrackedDescendantsMap*& descendantMap, TrackedContainerMap*& containerMap)
{
if (std::unique_ptr<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()
{
removeFromUpdateScrollInfoAfterLayoutTransaction();
if (gRareDataMap)
gRareDataMap->remove(this);
if (gPercentHeightDescendantsMap)
removeBlockFromDescendantAndContainerMaps(this, gPercentHeightDescendantsMap, gPercentHeightContainerMap);
if (gPositionedDescendantsMap)
removeBlockFromDescendantAndContainerMaps(this, gPositionedDescendantsMap, gPositionedContainerMap);
}
void RenderBlock::willBeDestroyed()
{
if (!documentBeingDestroyed()) {
if (parent())
parent()->dirtyLinesFromChangedChild(*this);
}
RenderBox::willBeDestroyed();
}
bool RenderBlock::hasRareData() const
{
return gRareDataMap ? gRareDataMap->contains(this) : false;
}
void RenderBlock::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr;
setReplaced(newStyle.isDisplayInlineType());
if (oldStyle && oldStyle->hasTransformRelatedProperty() && !newStyle.hasTransformRelatedProperty())
removePositionedObjects(nullptr, NewContainingBlock);
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(nullptr, 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.
auto containingBlock = parent();
while (containingBlock && !is<RenderView>(*containingBlock)
&& (containingBlock->style().position() == StaticPosition || (containingBlock->isInline() && !containingBlock->isReplaced()))) {
if (containingBlock->style().position() == RelativePosition && containingBlock->isInline() && !containingBlock->isReplaced()) {
containingBlock = containingBlock->containingBlock();
break;
}
containingBlock = containingBlock->parent();
}
if (is<RenderBlock>(*containingBlock))
downcast<RenderBlock>(*containingBlock).removePositionedObjects(this, NewContainingBlock);
}
}
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)
{
RenderStyle& newStyle = style();
bool hadTransform = hasTransform();
bool flowThreadContainingBlockInvalidated = false;
if (oldStyle && oldStyle->position() != newStyle.position()) {
invalidateFlowThreadContainingBlockIncludingDescendants();
flowThreadContainingBlockInvalidated = true;
}
RenderBox::styleDidChange(diff, oldStyle);
if (hadTransform != hasTransform() && !flowThreadContainingBlockInvalidated)
invalidateFlowThreadContainingBlockIncludingDescendants();
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(RenderStyle::clone(newStyle));
currCont->setContinuation(nextCont);
}
}
propagateStyleToAnonymousChildren(PropagateToBlockChildrenOnly);
// 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.
setShouldForceRelayoutChildren(oldStyle && diff == StyleDifferenceLayout && needsLayout() && borderOrPaddingLogicalWidthChanged(oldStyle, &newStyle));
}
RenderBlock* RenderBlock::continuationBefore(RenderObject* beforeChild)
{
if (beforeChild && beforeChild->parent() == this)
return this;
RenderBlock* nextToLast = this;
RenderBlock* last = this;
for (auto* current = downcast<RenderBlock>(continuation()); current; current = downcast<RenderBlock>(current->continuation())) {
if (beforeChild && beforeChild->parent() == current) {
if (current->firstChild() == beforeChild)
return last;
return current;
}
nextToLast = last;
last = current;
}
if (!beforeChild && !last->firstChild())
return nextToLast;
return last;
}
void RenderBlock::addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild)
{
RenderBlock* flow = continuationBefore(beforeChild);
ASSERT(!beforeChild || is<RenderBlock>(*beforeChild->parent()));
RenderBoxModelObject* beforeChildParent = nullptr;
if (beforeChild)
beforeChildParent = downcast<RenderBoxModelObject>(beforeChild->parent());
else {
RenderBoxModelObject* continuation = flow->continuation();
if (continuation)
beforeChildParent = continuation;
else
beforeChildParent = flow;
}
if (newChild->isFloatingOrOutOfFlowPositioned()) {
beforeChildParent->addChildIgnoringContinuation(newChild, beforeChild);
return;
}
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);
}
RenderPtr<RenderBlock> RenderBlock::clone() const
{
RenderPtr<RenderBlock> cloneBlock;
if (isAnonymousBlock()) {
cloneBlock = RenderPtr<RenderBlock>(createAnonymousBlock());
cloneBlock->setChildrenInline(childrenInline());
} else {
RenderTreePosition insertionPosition(*parent());
cloneBlock = static_pointer_cast<RenderBlock>(element()->createElementRenderer(RenderStyle::clone(style()), insertionPosition));
cloneBlock->initializeStyle();
// 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::addChild(RenderObject* newChild, RenderObject* beforeChild)
{
if (continuation() && !isAnonymousBlock())
addChildToContinuation(newChild, beforeChild);
else
addChildIgnoringContinuation(newChild, beforeChild);
}
void RenderBlock::addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild)
{
if (beforeChild && beforeChild->parent() != this) {
RenderElement* 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.
RenderElement* 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;
}
}
}
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()) {
downcast<RenderBlock>(*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;
}
}
invalidateLineLayoutPath();
RenderBox::addChild(newChild, beforeChild);
if (madeBoxesNonInline && is<RenderBlock>(parent()) && isAnonymousBlock())
downcast<RenderBlock>(*parent()).removeLeftoverAnonymousBlock(this);
// this object may be dead here
}
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::deleteLines()
{
if (AXObjectCache* cache = document().existingAXObjectCache())
cache->recomputeIsIgnored(this);
}
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;
deleteLines();
while (child) {
RenderObject* inlineRunStart;
RenderObject* inlineRunEnd;
getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd);
if (!inlineRunStart)
break;
child = inlineRunEnd->nextSibling();
RenderBlock* block = createAnonymousBlock();
insertChildInternal(block, inlineRunStart, NotifyChildren);
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())
return;
RenderObject* firstAnChild = child->firstChild();
RenderObject* lastAnChild = child->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 == firstChild())
setFirstChild(firstAnChild);
if (child == lastChild())
setLastChild(lastAnChild);
} else {
if (child == firstChild())
setFirstChild(child->nextSibling());
if (child == lastChild())
setLastChild(child->previousSibling());
if (child->previousSibling())
child->previousSibling()->setNextSibling(child->nextSibling());
if (child->nextSibling())
child->nextSibling()->setPreviousSibling(child->previousSibling());
}
child->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 canDropAnonymousBlock(const RenderBlock& anonymousBlock)
{
if (anonymousBlock.beingDestroyed() || anonymousBlock.continuation())
return false;
if (anonymousBlock.isRubyRun() || anonymousBlock.isRubyBase())
return false;
return true;
}
static bool canMergeContiguousAnonymousBlocks(RenderObject& oldChild, RenderObject* previous, RenderObject* next)
{
if (oldChild.documentBeingDestroyed() || oldChild.isInline() || oldChild.virtualContinuation())
return false;
if (previous) {
if (!previous->isAnonymousBlock())
return false;
RenderBlock& previousAnonymousBlock = downcast<RenderBlock>(*previous);
if (!canDropAnonymousBlock(previousAnonymousBlock))
return false;
}
if (next) {
if (!next->isAnonymousBlock())
return false;
RenderBlock& nextAnonymousBlock = downcast<RenderBlock>(*next);
if (!canDropAnonymousBlock(nextAnonymousBlock))
return false;
}
return true;
}
void RenderBlock::dropAnonymousBoxChild(RenderBlock& parent, RenderBlock& child)
{
parent.setNeedsLayoutAndPrefWidthsRecalc();
parent.setChildrenInline(child.childrenInline());
if (auto* childFlowThread = child.flowThreadContainingBlock())
childFlowThread->removeFlowChildInfo(&child);
RenderObject* nextSibling = child.nextSibling();
parent.removeChildInternal(child, child.hasLayer() ? NotifyChildren : DontNotifyChildren);
child.moveAllChildrenTo(&parent, nextSibling, child.hasLayer());
// Delete the now-empty block's lines and nuke it.
child.deleteLines();
child.destroy();
}
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;
}
// If this child is a block, and if our previous and next siblings are both anonymous blocks
// with inline content, then we can 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 = downcast<RenderBlock>(*next);
RenderBlock& prevBlock = downcast<RenderBlock>(*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());
// Cache this value as it might get changed in setStyle() call.
bool inlineChildrenBlockHasLayer = inlineChildrenBlock.hasLayer();
inlineChildrenBlock.setStyle(RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK));
removeChildInternal(inlineChildrenBlock, inlineChildrenBlockHasLayer ? NotifyChildren : DontNotifyChildren);
// Now just put the inlineChildrenBlock inside the blockChildrenBlock.
RenderObject* beforeChild = prev == &inlineChildrenBlock ? blockChildrenBlock.firstChild() : nullptr;
blockChildrenBlock.insertChildInternal(&inlineChildrenBlock, beforeChild,
(inlineChildrenBlockHasLayer || blockChildrenBlock.hasLayer()) ? NotifyChildren : DontNotifyChildren);
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 = nullptr;
else
next = nullptr;
} 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.deleteLines();
nextBlock.destroy();
next = nullptr;
}
}
invalidateLineLayoutPath();
RenderBox::removeChild(oldChild);
RenderObject* child = prev ? prev : next;
if (canMergeAnonymousBlocks && child && !child->previousSibling() && !child->nextSibling() && canDropAnonymousBlockChild()) {
// The removal has knocked us down to containing only a single anonymous
// box. We can pull the content right back up into our box.
dropAnonymousBoxChild(*this, downcast<RenderBlock>(*child));
} else if (((prev && prev->isAnonymousBlock()) || (next && next->isAnonymousBlock())) && canDropAnonymousBlockChild()) {
// It's possible that the removal has knocked us down to a single anonymous
// block with floating siblings.
RenderBlock& anonBlock = downcast<RenderBlock>((prev && prev->isAnonymousBlock()) ? *prev : *next);
if (canDropAnonymousBlock(anonBlock)) {
bool dropAnonymousBlock = true;
for (auto& sibling : childrenOfType<RenderObject>(*this)) {
if (&sibling == &anonBlock)
continue;
if (!sibling.isFloating()) {
dropAnonymousBlock = false;
break;
}
}
if (dropAnonymousBlock)
dropAnonymousBoxChild(*this, anonBlock);
}
}
if (!firstChild()) {
// If this was our last child be sure to clear out our line boxes.
if (childrenInline())
deleteLines();
// 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()) {
auto containingBlockIgnoringAnonymous = containingBlock();
while (containingBlockIgnoringAnonymous && containingBlockIgnoringAnonymous->isAnonymousBlock())
containingBlockIgnoringAnonymous = containingBlockIgnoringAnonymous->containingBlock();
for (RenderObject* current = this; current; current = current->previousInPreOrder(containingBlockIgnoringAnonymous)) {
if (current->virtualContinuation() != this)
continue;
// Found our previous continuation. We just need to point it to
// |this|'s next continuation.
RenderBoxModelObject* nextContinuation = continuation();
if (is<RenderInline>(*current))
downcast<RenderInline>(*current).setContinuation(nextContinuation);
else if (is<RenderBlock>(*current))
downcast<RenderBlock>(*current).setContinuation(nextContinuation);
else
ASSERT_NOT_REACHED();
break;
}
setContinuation(nullptr);
destroy();
}
}
}
bool RenderBlock::childrenPreventSelfCollapsing() const
{
// 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 true;
}
return false;
}
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.isPercentOrCalculated() && !document().inQuirksMode()) {
hasAutoHeight = true;
for (RenderBlock* cb = containingBlock(); cb && !is<RenderView>(*cb); 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.isPercentOrCalculated()) && logicalHeightLength.isZero()))
return !childrenPreventSelfCollapsing();
return false;
}
static inline UpdateScrollInfoAfterLayoutTransaction* currentUpdateScrollInfoAfterLayoutTransaction()
{
if (!updateScrollInfoAfterLayoutTransactionStack())
return nullptr;
return &updateScrollInfoAfterLayoutTransactionStack()->last();
}
void RenderBlock::beginUpdateScrollInfoAfterLayoutTransaction()
{
if (!updateScrollInfoAfterLayoutTransactionStack())
updateScrollInfoAfterLayoutTransactionStack() = std::make_unique<DelayedUpdateScrollInfoStack>();
if (updateScrollInfoAfterLayoutTransactionStack()->isEmpty() || currentUpdateScrollInfoAfterLayoutTransaction()->view != &view())
updateScrollInfoAfterLayoutTransactionStack()->append(UpdateScrollInfoAfterLayoutTransaction(view()));
++currentUpdateScrollInfoAfterLayoutTransaction()->nestedCount;
}
void RenderBlock::endAndCommitUpdateScrollInfoAfterLayoutTransaction()
{
UpdateScrollInfoAfterLayoutTransaction* transaction = currentUpdateScrollInfoAfterLayoutTransaction();
ASSERT(transaction);
ASSERT(transaction->view == &view());
if (--transaction->nestedCount)
return;
// Calling RenderLayer::updateScrollInfoAfterLayout() may cause its associated block to layout again and
// updates its scroll info (i.e. call RenderBlock::updateScrollInfoAfterLayout()). We remove |transaction|
// from the transaction stack to ensure that all subsequent calls to RenderBlock::updateScrollInfoAfterLayout()
// are dispatched immediately. That is, to ensure that such subsequent calls aren't added to |transaction|
// while we are processing it.
Vector<RenderBlock*> blocksToUpdate;
copyToVector(transaction->blocks, blocksToUpdate);
updateScrollInfoAfterLayoutTransactionStack()->removeLast();
if (updateScrollInfoAfterLayoutTransactionStack()->isEmpty())
updateScrollInfoAfterLayoutTransactionStack() = nullptr;
for (auto* block : blocksToUpdate) {
ASSERT(block->hasOverflowClip());
block->layer()->updateScrollInfoAfterLayout();
block->clearLayoutOverflow();
}
}
void RenderBlock::removeFromUpdateScrollInfoAfterLayoutTransaction()
{
if (UNLIKELY(updateScrollInfoAfterLayoutTransactionStack().get() != 0)) {
UpdateScrollInfoAfterLayoutTransaction* transaction = currentUpdateScrollInfoAfterLayoutTransaction();
ASSERT(transaction);
if (transaction->view == &view())
transaction->blocks.remove(this);
}
}
void RenderBlock::updateScrollInfoAfterLayout()
{
if (!hasOverflowClip())
return;
// 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
if (!style().isFlippedBlocksWritingMode()) {
UpdateScrollInfoAfterLayoutTransaction* transaction = currentUpdateScrollInfoAfterLayoutTransaction();
if (transaction && transaction->view == &view()) {
transaction->blocks.add(this);
return;
}
}
if (layer())
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.
UpdateScrollInfoAfterLayoutTransaction* transaction = currentUpdateScrollInfoAfterLayoutTransaction();
bool isDelayingUpdateScrollInfoAfterLayoutInView = transaction && transaction->view == &view();
if (hasControlClip() && m_overflow && !isDelayingUpdateScrollInfoAfterLayoutInView)
clearLayoutOverflow();
invalidateBackgroundObscurationStatus();
}
static RenderBlockRareData* getBlockRareData(const RenderBlock* block)
{
return gRareDataMap ? gRareDataMap->get(block) : nullptr;
}
static RenderBlockRareData& ensureBlockRareData(const RenderBlock* block)
{
if (!gRareDataMap)
gRareDataMap = new RenderBlockRareDataMap;
auto& rareData = gRareDataMap->add(block, nullptr).iterator->value;
if (!rareData)
rareData = std::make_unique<RenderBlockRareData>();
return *rareData.get();
}
void RenderBlock::preparePaginationBeforeBlockLayout(bool& relayoutChildren)
{
// Regions changing widths can force us to relayout our children.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
flowThread->logicalWidthChangedInRegionsForBlock(this, relayoutChildren);
}
bool RenderBlock::recomputeLogicalWidth()
{
LayoutUnit oldWidth = logicalWidth();
updateLogicalWidth();
bool hasBorderOrPaddingLogicalWidthChanged = this->hasBorderOrPaddingLogicalWidthChanged();
setShouldForceRelayoutChildren(false);
return oldWidth != logicalWidth() || hasBorderOrPaddingLogicalWidthChanged;
}
void RenderBlock::layoutBlock(bool, LayoutUnit)
{
ASSERT_NOT_REACHED();
clearNeedsLayout();
}
void RenderBlock::addOverflowFromChildren()
{
if (childrenInline())
addOverflowFromInlineChildren();
else
addOverflowFromBlockChildren();
// If this block is flowed inside a flow thread, make sure its overflow is propagated to the containing regions.
if (m_overflow) {
if (RenderFlowThread* containingFlowThread = flowThreadContainingBlock())
containingFlowThread->addRegionsVisualOverflow(this, m_overflow->visualOverflowRect());
}
}
void RenderBlock::computeOverflow(LayoutUnit oldClientAfterEdge, bool)
{
clearOverflow();
// Add overflow from children.
addOverflowFromChildren();
// 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(flippedClientBoxRect());
LayoutRect rectToApply;
if (isHorizontalWritingMode())
rectToApply = LayoutRect(clientRect.x(), clientRect.y(), 1, std::max<LayoutUnit>(0, oldClientAfterEdge - clientRect.y()));
else
rectToApply = LayoutRect(clientRect.x(), clientRect.y(), std::max<LayoutUnit>(0, oldClientAfterEdge - clientRect.x()), 1);
addLayoutOverflow(rectToApply);
if (hasRenderOverflow())
m_overflow->setLayoutClientAfterEdge(oldClientAfterEdge);
}
// Add visual overflow from box-shadow, border-image-outset and outline.
addVisualEffectOverflow();
// Add visual overflow from theme.
addVisualOverflowFromTheme();
}
void RenderBlock::clearLayoutOverflow()
{
if (!m_overflow)
return;
if (visualOverflowRect() == borderBoxRect()) {
// FIXME: Implement complete solution for regions overflow.
clearOverflow();
return;
}
m_overflow->setLayoutOverflow(borderBoxRect());
}
void RenderBlock::addOverflowFromBlockChildren()
{
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (!child->isFloatingOrOutOfFlowPositioned())
addOverflowFromChild(child);
}
}
void RenderBlock::addOverflowFromPositionedObjects()
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
for (auto it = positionedDescendants->begin(), end = positionedDescendants->end(); it != end; ++it) {
RenderBox* positionedObject = *it;
// Fixed positioned elements don't contribute to layout overflow, since they don't scroll with the content.
if (positionedObject->style().position() != FixedPosition)
addOverflowFromChild(positionedObject, { positionedObject->x(), positionedObject->y() });
}
}
void RenderBlock::addVisualOverflowFromTheme()
{
if (!style().hasAppearance())
return;
FloatRect inflatedRect = borderBoxRect();
theme().adjustRepaintRect(*this, inflatedRect);
addVisualOverflow(snappedIntRect(LayoutRect(inflatedRect)));
if (RenderFlowThread* flowThread = flowThreadContainingBlock())
flowThread->addRegionsVisualOverflowFromTheme(this);
}
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 = std::max(blockOffset, blockOffset + (region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage()));
LayoutUnit startOff = startOffsetForLineInRegion(blockOffset, DoNotIndentText, region, logicalHeightForChild(child));
if (style().textAlign() != WEBKIT_CENTER && !child.style().marginStartUsing(&style()).isAuto()) {
if (childMarginStart < 0)
startOff += childMarginStart;
newPosition = std::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::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.setChildNeedsLayout(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::dirtyForLayoutFromPercentageHeightDescendants()
{
if (!gPercentHeightDescendantsMap)
return;
TrackedRendererListHashSet* descendants = gPercentHeightDescendantsMap->get(this);
if (!descendants)
return;
for (auto it = descendants->begin(), end = descendants->end(); it != end; ++it) {
RenderBox* box = *it;
while (box != this) {
if (box->normalChildNeedsLayout())
break;
box->setChildNeedsLayout(MarkOnlyThis);
// If the width of an image is affected by the height of a child (e.g., an image with an aspect ratio),
// then we have to dirty preferred widths, since even enclosing blocks can become dirty as a result.
// (A horizontal flexbox that contains an inline image wrapped in an anonymous block for example.)
if (box->hasAspectRatio())
box->setPreferredLogicalWidthsDirty(true);
box = box->containingBlock();
ASSERT(box);
if (!box)
break;
}
}
}
void RenderBlock::simplifiedNormalFlowLayout()
{
if (childrenInline()) {
ListHashSet<RootInlineBox*> lineBoxes;
for (InlineWalker walker(*this); !walker.atEnd(); walker.advance()) {
RenderObject& renderer = *walker.current();
if (!renderer.isOutOfFlowPositioned() && (renderer.isReplaced() || renderer.isFloating())) {
RenderBox& box = downcast<RenderBox>(renderer);
box.layoutIfNeeded();
if (box.inlineBoxWrapper())
lineBoxes.add(&box.inlineBoxWrapper()->root());
} else if (is<RenderText>(renderer) || (is<RenderInline>(renderer) && !walker.atEndOfInline()))
renderer.clearNeedsLayout();
}
// FIXME: Glyph overflow will get lost in this case, but not really a big deal.
// FIXME: Find a way to invalidate the knownToHaveNoOverflow flag on the InlineBoxes.
GlyphOverflowAndFallbackFontsMap textBoxDataMap;
for (auto it = lineBoxes.begin(), end = lineBoxes.end(); it != end; ++it) {
RootInlineBox* box = *it;
box->computeOverflow(box->lineTop(), box->lineBottom(), textBoxDataMap);
}
} else {
for (auto* 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(), hasTransform() || hasReflection() || style().isFlippedBlocksWritingMode());
if (needsPositionedMovementLayout() && !tryLayoutDoingPositionedMovementOnly()) {
statePusher.pop();
return false;
}
// Lay out positioned descendants or objects that just need to recompute overflow.
if (needsSimplifiedNormalFlowLayout())
simplifiedNormalFlowLayout();
// Make sure a forced break is applied after the content if we are a flow thread in a simplified layout.
// This ensures the size information is correctly computed for the last auto-height region receiving content.
if (is<RenderFlowThread>(*this))
downcast<RenderFlowThread>(*this).applyBreakAfterContent(clientLogicalBottom());
// 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();
clearNeedsLayout();
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;
auto o = child.parent();
while (o && !is<RenderView>(*o) && o->style().position() != AbsolutePosition)
o = o->parent();
if (o->style().position() != AbsolutePosition)
return;
auto& box = downcast<RenderBox>(child);
if (hasStaticInlinePosition) {
LogicalExtentComputedValues computedValues;
box.computeLogicalWidthInRegion(computedValues);
LayoutUnit newLeft = computedValues.m_position;
if (newLeft != box.logicalLeft())
box.setChildNeedsLayout(MarkOnlyThis);
} else if (hasStaticBlockPosition) {
LayoutUnit oldTop = box.logicalTop();
box.updateLogicalHeight();
if (box.logicalTop() != oldTop)
box.setChildNeedsLayout(MarkOnlyThis);
}
}
LayoutUnit RenderBlock::marginIntrinsicLogicalWidthForChild(RenderBox& child) const
{
// A margin has three types: fixed, percentage, and auto (variable).
// Auto and percentage margins become 0 when computing min/max width.
// Fixed margins can be added in as is.
Length marginLeft = child.style().marginStartUsing(&style());
Length marginRight = child.style().marginEndUsing(&style());
LayoutUnit margin = 0;
if (marginLeft.isFixed())
margin += marginLeft.value();
if (marginRight.isFixed())
margin += marginRight.value();
return margin;
}
void RenderBlock::layoutPositionedObject(RenderBox& r, bool relayoutChildren, bool fixedPositionObjectsOnly)
{
estimateRegionRangeForBoxChild(r);
// 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();
return;
}
// 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(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);
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.clearNeedsLayout();
// If we are paginated or in a line grid, 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(MarkOnlyThis);
r.layoutIfNeeded();
}
if (updateRegionRangeForBoxChild(r)) {
r.setNeedsLayout(MarkOnlyThis);
r.layoutIfNeeded();
}
}
void RenderBlock::layoutPositionedObjects(bool relayoutChildren, bool fixedPositionObjectsOnly)
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
// Do not cache positionedDescendants->end() in a local variable, since |positionedDescendants| can be mutated
// as it is walked. We always need to fetch the new end() value dynamically.
for (auto it = positionedDescendants->begin(); it != positionedDescendants->end(); ++it)
layoutPositionedObject(**it, relayoutChildren, fixedPositionObjectsOnly);
}
void RenderBlock::markPositionedObjectsForLayout()
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
for (auto it = positionedDescendants->begin(), end = positionedDescendants->end(); it != end; ++it) {
RenderBox* r = *it;
r->setChildNeedsLayout();
}
}
void RenderBlock::markForPaginationRelayoutIfNeeded()
{
if (needsLayout() || !view().layoutState()->isPaginated())
return;
if (view().layoutState()->pageLogicalHeightChanged() || (view().layoutState()->pageLogicalHeight() && view().layoutState()->pageLogicalOffset(this, logicalTop()) != pageLogicalOffset()))
setChildNeedsLayout(MarkOnlyThis);
}
void RenderBlock::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
RenderNamedFlowFragment* namedFlowFragment = currentRenderNamedFlowFragment();
// Check our region range to make sure we need to be painting in this region.
if (namedFlowFragment && !namedFlowFragment->flowThread()->objectShouldFragmentInFlowRegion(this, namedFlowFragment))
return;
LayoutPoint adjustedPaintOffset = paintOffset + location();
PaintPhase phase = paintInfo.phase;
// Check if we need to do anything at all.
// FIXME: Could eliminate the isDocumentElementRenderer() check if we fix background painting so that the RenderView
// paints the root's background.
if (!isDocumentElementRenderer()) {
LayoutRect overflowBox = overflowRectForPaintRejection(namedFlowFragment);
flipForWritingMode(overflowBox);
overflowBox.moveBy(adjustedPaintOffset);
if (!overflowBox.intersects(paintInfo.rect)
#if PLATFORM(IOS)
// FIXME: This may be applicable to non-iOS ports.
&& (!hasLayer() || !layer()->isComposited())
#endif
)
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 ((phase == PaintPhaseBlockBackground || phase == PaintPhaseChildBlockBackground) && hasOverflowClip() && layer()
&& style().visibility() == VISIBLE && paintInfo.shouldPaintWithinRoot(*this) && !paintInfo.paintRootBackgroundOnly())
layer()->paintOverflowControls(paintInfo.context(), roundedIntPoint(adjustedPaintOffset), snappedIntRect(paintInfo.rect));
}
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())
paintInlineChildren(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 (auto* 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, PaintBlockType paintType)
{
// Check for page-break-before: always, and if it's set, break and bail.
bool checkBeforeAlways = !childrenInline() && (usePrintRect && alwaysPageBreak(child.style().breakBefore()));
LayoutUnit absoluteChildY = paintOffset.y() + child.y();
if (checkBeforeAlways
&& absoluteChildY > paintInfo.rect.y()
&& absoluteChildY < paintInfo.rect.maxY()) {
view().setBestTruncatedAt(absoluteChildY, this, true);
return false;
}
if (!child.isFloating() && child.isReplaced() && usePrintRect && child.height() <= view().printRect().height()) {
// Paginate block-level replaced elements.
if (absoluteChildY + child.height() > view().printRect().maxY()) {
if (absoluteChildY < view().truncatedAt())
view().setBestTruncatedAt(absoluteChildY, &child);
// If we were able to truncate, don't paint.
if (absoluteChildY >= view().truncatedAt())
return false;
}
}
LayoutPoint childPoint = flipForWritingModeForChild(&child, paintOffset);
if (!child.hasSelfPaintingLayer() && !child.isFloating()) {
if (paintType == PaintAsInlineBlock)
child.paintAsInlineBlock(paintInfoForChild, childPoint);
else
child.paint(paintInfoForChild, childPoint);
}
// Check for page-break-after: always, and if it's set, break and bail.
bool checkAfterAlways = !childrenInline() && (usePrintRect && alwaysPageBreak(child.style().breakAfter()));
if (checkAfterAlways
&& (absoluteChildY + child.height()) > paintInfo.rect.y()
&& (absoluteChildY + child.height()) < paintInfo.rect.maxY()) {
view().setBestTruncatedAt(absoluteChildY + child.height() + std::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().caretBrowsingEnabled();
RenderBlock* caretPainter;
bool isContentEditable;
if (type == CursorCaret) {
caretPainter = frame().selection().caretRendererWithoutUpdatingLayout();
isContentEditable = frame().selection().selection().hasEditableStyle();
} 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()) {
bool didClipToRegion = false;
RenderNamedFlowFragment* namedFlowFragment = currentRenderNamedFlowFragment();
if (namedFlowFragment && is<RenderNamedFlowThread>(paintInfo.paintContainer)) {
// If this box goes beyond the current region, then make sure not to overflow the region.
// This (overflowing region X altough also fragmented to region X+1) could happen when one of this box's children
// overflows region X and is an unsplittable element (like an image).
// The same applies for a box overflowing the top of region X when that box is also fragmented in region X-1.
paintInfo.context().save();
didClipToRegion = true;
paintInfo.context().clip(downcast<RenderNamedFlowThread>(*paintInfo.paintContainer).decorationsClipRectForBoxInNamedFlowFragment(*this, *namedFlowFragment));
}
paintBoxDecorations(paintInfo, paintOffset);
if (didClipToRegion)
paintInfo.context().restore();
}
}
if (paintPhase == PaintPhaseMask && style().visibility() == VISIBLE) {
paintMask(paintInfo, paintOffset);
return;
}
if (paintPhase == PaintPhaseClippingMask && style().visibility() == VISIBLE) {
paintClippingMask(paintInfo, paintOffset);
return;
}
// If just painting the root background, then return.
if (paintInfo.paintRootBackgroundOnly())
return;
// Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).
LayoutPoint scrolledOffset = paintOffset;
scrolledOffset.move(-scrolledContentOffset());
// Column rules need to account for scrolling and clipping.
// FIXME: Clipping of column rules does not work. We will need a separate paint phase for column rules I suspect in order to get
// clipping correct (since it has to paint as background but is still considered "contents").
if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && style().visibility() == VISIBLE)
paintColumnRules(paintInfo, scrolledOffset);
// Done with backgrounds, borders and column rules.
if (paintPhase == PaintPhaseBlockBackground)
return;
// 2. paint contents
if (paintPhase != PaintPhaseSelfOutline)
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)
paintSelection(paintInfo, scrolledOffset); // Fill in gaps in selection on lines and between blocks.
// 4. paint floats.
if (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip)
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 = downcast<RenderInline>(inlineCont->element()->renderer());
RenderBlock* containingBlock = this->containingBlock();
bool inlineEnclosedInSelfPaintingLayer = false;
for (RenderBoxModelObject* box = inlineRenderer; box != containingBlock; 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())
containingBlock->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);
}
}
RenderInline* RenderBlock::inlineElementContinuation() const
{
RenderBoxModelObject* continuation = this->continuation();
return is<RenderInline>(continuation) ? downcast<RenderInline>(continuation) : nullptr;
}
RenderBlock* RenderBlock::blockElementContinuation() const
{
RenderBoxModelObject* currentContinuation = continuation();
if (!currentContinuation || currentContinuation->isInline())
return nullptr;
RenderBlock& nextContinuation = downcast<RenderBlock>(*currentContinuation);
if (nextContinuation.isAnonymousBlock())
return nextContinuation.blockElementContinuation();
return &nextContinuation;
}
static ContinuationOutlineTableMap* continuationOutlineTable()
{
static NeverDestroyed<ContinuationOutlineTableMap> table;
return &table.get();
}
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, std::unique_ptr<ListHashSet<RenderInline*>>(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;
std::unique_ptr<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(element() || 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() || isDocumentElementRenderer() || hasOverflowClip()
|| isPositioned() || isFloating()
|| isTableCell() || isInlineBlockOrInlineTable()
|| hasTransform() || hasReflection() || hasMask() || isWritingModeRoot()
|| isRenderFlowThread() || style().columnSpan() == ColumnSpanAll)
return true;
if (view().selectionUnsplitStart()) {
Node* startElement = view().selectionUnsplitStart()->node();
if (startElement && startElement->rootEditableElement() == element())
return true;
}
return false;
}
GapRects RenderBlock::selectionGapRectsForRepaint(const RenderLayerModelObject* repaintContainer)
{
ASSERT(!needsLayout());
if (!shouldPaintSelectionGaps())
return GapRects();
FloatPoint containerPoint = localToContainerPoint(FloatPoint(), repaintContainer, UseTransforms);
LayoutPoint offsetFromRepaintContainer(containerPoint - 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 ENABLE(TEXT_SELECTION)
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().isBox())
gapRectsBounds.move(layer->renderBox()->scrolledContentOffset());
}
layer->addBlockSelectionGapsBounds(gapRectsBounds);
}
}
}
#else
UNUSED_PARAM(paintInfo);
UNUSED_PARAM(paintOffset);
#endif
}
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()));
}
}
LayoutUnit blockDirectionOffset(RenderBlock& rootBlock, const LayoutSize& offsetFromRootBlock)
{
return rootBlock.isHorizontalWritingMode() ? offsetFromRootBlock.height() : offsetFromRootBlock.width();
}
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() || isDocumentElementRenderer()) { // The <body> must make sure to examine its containingBlock's positioned objects.
for (RenderBlock* cb = containingBlock(); cb && !is<RenderView>(*cb); cb = cb->containingBlock())
clipOutPositionedObjects(paintInfo, LayoutPoint(cb->x(), cb->y()), cb->positionedObjects()); // FIXME: Not right for flipped writing modes.
}
clipOutFloatingObjects(rootBlock, paintInfo, rootBlockPhysicalPosition, offsetFromRootBlock);
}
// 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 (!isRenderBlockFlow()) // FIXME: Make multi-column selection gap filling work someday.
return result;
if (hasTransform() || style().columnSpan() == ColumnSpanAll || isInFlowRenderFlowThread()) {
// 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;
}
RenderNamedFlowFragment* namedFlowFragment = currentRenderNamedFlowFragment();
if (paintInfo && namedFlowFragment && is<RenderFlowThread>(*paintInfo->paintContainer)) {
// Make sure the current object is actually flowed into the region being painted.
if (!downcast<RenderFlowThread>(*paintInfo->paintContainer).objectShouldFragmentInFlowRegion(this, namedFlowFragment))
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);
// 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) && !isRubyBase() && !isRubyText()) {
result.uniteCenter(blockSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
lastLogicalTop, lastLogicalLeft, lastLogicalRight, logicalHeight(), cache, paintInfo));
}
return result;
}
GapRects RenderBlock::inlineSelectionGaps(RenderBlock&, const LayoutPoint&, const LayoutSize&, LayoutUnit&, LayoutUnit&, LayoutUnit&, const LogicalSelectionOffsetCaches&, const PaintInfo*)
{
ASSERT_NOT_REACHED();
return GapRects();
}
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;
// 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->isInFlowPositioned() && 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()->offsetForInFlowPosition();
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)) && !isRubyBase() && !isRubyText();
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 && is<RenderBlock>(*curr)) {
// We must be a block that has some selected object inside it, so recur.
result.unite(downcast<RenderBlock>(*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 = std::max(lastLogicalLeft, logicalLeftSelectionOffset(rootBlock, logicalBottom, cache));
LayoutUnit logicalRight = std::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(snapRectToDevicePixels(gapRect, document().deviceScaleFactor()), selectionBackgroundColor());
return gapRect;
}
LayoutRect RenderBlock::logicalLeftSelectionGap(RenderBlock& rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
RenderBoxModelObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
LayoutUnit rootBlockLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalTop;
LayoutUnit rootBlockLogicalLeft = std::max(logicalLeftSelectionOffset(rootBlock, logicalTop, cache), logicalLeftSelectionOffset(rootBlock, logicalTop + logicalHeight, cache));
LayoutUnit rootBlockLogicalRight = std::min(inlineDirectionOffset(rootBlock, offsetFromRootBlock) + logicalLeft,
std::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(snapRectToDevicePixels(gapRect, document().deviceScaleFactor()), selObj->selectionBackgroundColor());
return gapRect;
}
LayoutRect RenderBlock::logicalRightSelectionGap(RenderBlock& rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
RenderBoxModelObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const LogicalSelectionOffsetCaches& cache, const PaintInfo* paintInfo)
{
LayoutUnit rootBlockLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalTop;
LayoutUnit rootBlockLogicalLeft = std::max(inlineDirectionOffset(rootBlock, offsetFromRootBlock) + logicalRight,
std::max(logicalLeftSelectionOffset(rootBlock, logicalTop, cache), logicalLeftSelectionOffset(rootBlock, logicalTop + logicalHeight, cache)));
LayoutUnit rootBlockLogicalRight = std::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(snapRectToDevicePixels(gapRect, document().deviceScaleFactor()), selObj->selectionBackgroundColor());
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, DoNotIndentText);
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;
}
RenderBlock* cb = this;
const LogicalSelectionOffsetCaches* currentCache = &cache;
while (cb != &rootBlock) {
logicalLeft += cb->logicalLeft();
ASSERT(currentCache);
auto 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, DoNotIndentText);
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;
}
RenderBlock* cb = this;
const LogicalSelectionOffsetCaches* currentCache = &cache;
while (cb != &rootBlock) {
logicalRight += cb->logicalLeft();
ASSERT(currentCache);
auto info = currentCache->containingBlockInfo(*cb);
cb = info.block();
currentCache = info.cache();
}
return logicalRight;
}
RenderBlock* RenderBlock::blockBeforeWithinSelectionRoot(LayoutSize& offset) const
{
if (isSelectionRoot())
return nullptr;
const RenderElement* object = this;
RenderObject* sibling;
do {
sibling = object->previousSibling();
while (sibling && (!is<RenderBlock>(*sibling) || downcast<RenderBlock>(*sibling).isSelectionRoot()))
sibling = sibling->previousSibling();
offset -= LayoutSize(downcast<RenderBlock>(*object).logicalLeft(), downcast<RenderBlock>(*object).logicalTop());
object = object->parent();
} while (!sibling && is<RenderBlock>(object) && !downcast<RenderBlock>(*object).isSelectionRoot());
if (!sibling)
return nullptr;
RenderBlock* beforeBlock = downcast<RenderBlock>(sibling);
offset += LayoutSize(beforeBlock->logicalLeft(), beforeBlock->logicalTop());
RenderObject* child = beforeBlock->lastChild();
while (is<RenderBlock>(child)) {
beforeBlock = downcast<RenderBlock>(child);
offset += LayoutSize(beforeBlock->logicalLeft(), beforeBlock->logicalTop());
child = beforeBlock->lastChild();
}
return beforeBlock;
}
void RenderBlock::insertIntoTrackedRendererMaps(RenderBox& descendant, TrackedDescendantsMap*& descendantsMap, TrackedContainerMap*& containerMap, bool forceNewEntry)
{
if (!descendantsMap) {
descendantsMap = new TrackedDescendantsMap;
containerMap = new TrackedContainerMap;
}
TrackedRendererListHashSet* descendantSet = descendantsMap->get(this);
if (!descendantSet) {
descendantSet = new TrackedRendererListHashSet;
descendantsMap->set(this, std::unique_ptr<TrackedRendererListHashSet>(descendantSet));
}
if (forceNewEntry) {
descendantSet->remove(&descendant);
containerMap->remove(&descendant);
}
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, std::unique_ptr<HashSet<RenderBlock*>>(containerSet));
}
ASSERT(!containerSet->contains(this));
containerSet->add(this);
}
void RenderBlock::removeFromTrackedRendererMaps(RenderBox& descendant, TrackedDescendantsMap*& descendantsMap, TrackedContainerMap*& containerMap)
{
if (!descendantsMap)
return;
std::unique_ptr<HashSet<RenderBlock*>> containerSet = containerMap->take(&descendant);
if (!containerSet)
return;
for (auto it = containerSet->begin(), end = containerSet->end(); 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 nullptr;
}
void RenderBlock::insertPositionedObject(RenderBox& o)
{
ASSERT(!isAnonymousBlock());
if (o.isRenderFlowThread())
return;
insertIntoTrackedRendererMaps(o, gPositionedDescendantsMap, gPositionedContainerMap, isRenderView());
}
void RenderBlock::removePositionedObject(RenderBox& o)
{
removeFromTrackedRendererMaps(o, gPositionedDescendantsMap, gPositionedContainerMap);
}
void RenderBlock::removePositionedObjects(RenderBlock* o, ContainingBlockState containingBlockState)
{
TrackedRendererListHashSet* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
Vector<RenderBox*, 16> deadObjects;
for (auto it = positionedDescendants->begin(), end = positionedDescendants->end(); it != end; ++it) {
RenderBox* r = *it;
if (!o || r->isDescendantOf(o)) {
if (containingBlockState == NewContainingBlock)
r->setChildNeedsLayout(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.
RenderElement* p = r->parent();
while (p && !p->isRenderBlock())
p = p->parent();
if (p)
p->setChildNeedsLayout();
deadObjects.append(r);
}
}
for (unsigned i = 0; i < deadObjects.size(); i++)
removePositionedObject(*deadObjects.at(i));
}
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* child = parent.firstChild(); child; child = child->nextInPreOrder(&parent)) {
if (!is<RenderBox>(*child))
continue;
auto& box = downcast<RenderBox>(*child);
if (!hasPercentHeightDescendant(box))
continue;
removePercentHeightDescendant(box);
}
}
LayoutUnit RenderBlock::textIndentOffset() const
{
LayoutUnit cw = 0;
if (style().textIndent().isPercentOrCalculated())
cw = containingBlock()->availableLogicalWidth();
return minimumValueForLength(style().textIndent(), cw);
}
LayoutUnit RenderBlock::logicalLeftOffsetForContent(RenderRegion* region) const
{
LayoutUnit logicalLeftOffset = style().isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop();
if (style().shouldPlaceBlockDirectionScrollbarOnLeft())
logicalLeftOffset += verticalScrollbarWidth();
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();
if (style().shouldPlaceBlockDirectionScrollbarOnLeft())
logicalRightOffset += verticalScrollbarWidth();
logicalRightOffset += availableLogicalWidth();
if (!region)
return logicalRightOffset;
LayoutRect boxRect = borderBoxRectInRegion(region);
return logicalRightOffset - (logicalWidth() - (isHorizontalWritingMode() ? boxRect.maxX() : boxRect.maxY()));
}
LayoutUnit RenderBlock::adjustLogicalLeftOffsetForLine(LayoutUnit offsetFromFloats, bool applyTextIndent) const
{
LayoutUnit left = offsetFromFloats;
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().fontCascade().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::adjustLogicalRightOffsetForLine(LayoutUnit offsetFromFloats, bool applyTextIndent) const
{
LayoutUnit right = offsetFromFloats;
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().fontCascade().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;
}
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().hasFlowFrom();
}
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.
if (isRenderView())
return &document();
return isAnonymousBlockContinuation() ? continuation()->element() : element();
}
bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
LayoutPoint adjustedLocation(accumulatedOffset + location());
LayoutSize localOffset = toLayoutSize(adjustedLocation);
RenderFlowThread* flowThread = flowThreadContainingBlock();
RenderNamedFlowFragment* namedFlowFragment = flowThread ? downcast<RenderNamedFlowFragment>(flowThread->currentRegion()) : nullptr;
// If we are now searching inside a region, make sure this element
// is being fragmented into this region.
if (namedFlowFragment && !flowThread->objectShouldFragmentInFlowRegion(this, namedFlowFragment))
return false;
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 (style().clipPath()) {
switch (style().clipPath()->type()) {
case ClipPathOperation::Shape: {
auto& clipPath = downcast<ShapeClipPathOperation>(*style().clipPath());
LayoutRect referenceBoxRect;
switch (clipPath.referenceBox()) {
case CSSBoxType::MarginBox:
referenceBoxRect = marginBoxRect();
break;
case CSSBoxType::BorderBox:
referenceBoxRect = borderBoxRect();
break;
case CSSBoxType::PaddingBox:
referenceBoxRect = paddingBoxRect();
break;
case CSSBoxType::ContentBox:
referenceBoxRect = contentBoxRect();
break;
case CSSBoxType::BoxMissing:
case CSSBoxType::Fill:
case CSSBoxType::Stroke:
case CSSBoxType::ViewBox:
referenceBoxRect = borderBoxRect();
}
if (!clipPath.pathForReferenceRect(referenceBoxRect).contains(locationInContainer.point() - localOffset, clipPath.windRule()))
return false;
break;
}
case ClipPathOperation::Reference: {
const auto& referenceClipPathOperation = downcast<ReferenceClipPathOperation>(*style().clipPath());
auto* element = document().getElementById(referenceClipPathOperation.fragment());
if (!element || !element->renderer())
break;
if (!is<SVGClipPathElement>(*element))
break;
auto& clipper = downcast<RenderSVGResourceClipper>(*element->renderer());
if (!clipper.hitTestClipContent(FloatRect(borderBoxRect()), FloatPoint(locationInContainer.point() - localOffset)))
return false;
break;
}
case ClipPathOperation::Box:
break;
}
}
// 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, namedFlowFragment, IncludeOverlayScrollbarSize)));
if (checkChildren) {
// Hit test descendants first.
LayoutSize scrolledOffset(localOffset - scrolledContentOffset());
if (hitTestAction == HitTestFloat && hitTestFloats(request, result, locationInContainer, toLayoutPoint(scrolledOffset)))
return true;
if (hitTestContents(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);
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::hitTestContents(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
if (childrenInline() && !isTable())
return hitTestInlineChildren(request, result, locationInContainer, accumulatedOffset, hitTestAction);
// Hit test our children.
HitTestAction childHitTest = hitTestAction;
if (hitTestAction == HitTestChildBlockBackgrounds)
childHitTest = HitTestChildBlockBackground;
for (auto* 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;
}
static inline bool isEditingBoundary(RenderElement* ancestor, RenderObject& child)
{
ASSERT(!ancestor || ancestor->nonPseudoElement());
ASSERT(child.nonPseudoNode());
return !ancestor || !ancestor->parent() || (ancestor->hasLayer() && ancestor->parent()->isRenderView())
|| ancestor->nonPseudoElement()->hasEditableStyle() == child.nonPseudoNode()->hasEditableStyle();
}
// 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.
VisiblePosition positionForPointRespectingEditingBoundaries(RenderBlock& parent, RenderBox& child, const LayoutPoint& pointInParentCoordinates)
{
LayoutPoint childLocation = child.location();
if (child.isInFlowPositioned())
childLocation += child.offsetForInFlowPosition();
// 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
Element* childElement= child.nonPseudoElement();
if (!childElement)
return child.positionForPoint(pointInChildCoordinates, nullptr);
// 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
RenderElement* ancestor = &parent;
while (ancestor && !ancestor->nonPseudoElement())
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, nullptr);
// 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(childElement->computeNodeIndex(), DOWNSTREAM);
return ancestor->createVisiblePosition(childElement->computeNodeIndex() + 1, UPSTREAM);
}
VisiblePosition RenderBlock::positionForPointWithInlineChildren(const LayoutPoint&, const RenderRegion*)
{
ASSERT_NOT_REACHED();
return VisiblePosition();
}
static inline bool isChildHitTestCandidate(const RenderBox& box)
{
return box.height() && box.style().visibility() == VISIBLE && !box.isFloatingOrOutOfFlowPositioned() && !box.isInFlowRenderFlowThread();
}
// Valid candidates in a FlowThread must be rendered by the region.
static inline bool isChildHitTestCandidate(const RenderBox& box, const RenderRegion* region, const LayoutPoint& point)
{
if (!isChildHitTestCandidate(box))
return false;
if (!region)
return true;
const RenderBlock& block = is<RenderBlock>(box) ? downcast<RenderBlock>(box) : *box.containingBlock();
return block.regionAtBlockOffset(point.y()) == region;
}
VisiblePosition RenderBlock::positionForPoint(const LayoutPoint& point, const RenderRegion* region)
{
if (isTable())
return RenderBox::positionForPoint(point, region);
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, region);
RenderBox* lastCandidateBox = lastChildBox();
if (!region)
region = regionAtBlockOffset(pointInLogicalContents.y());
while (lastCandidateBox && !isChildHitTestCandidate(*lastCandidateBox, region, pointInLogicalContents))
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 (auto* childBox = firstChildBox(); childBox; childBox = childBox->nextSiblingBox()) {
if (!isChildHitTestCandidate(*childBox, region, pointInLogicalContents))
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, region, pointInLogicalContents) && (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, region);
}
void RenderBlock::offsetForContents(LayoutPoint& offset) const
{
offset = flipForWritingMode(offset);
offset += scrolledContentOffset();
offset = flipForWritingMode(offset);
}
void RenderBlock::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
ASSERT(!childrenInline());
computeBlockPreferredLogicalWidths(minLogicalWidth, maxLogicalWidth);
maxLogicalWidth = std::max(minLogicalWidth, maxLogicalWidth);
int scrollbarWidth = intrinsicScrollbarLogicalWidth();
maxLogicalWidth += scrollbarWidth;
minLogicalWidth += scrollbarWidth;
}
void RenderBlock::computePreferredLogicalWidths()
{
ASSERT(preferredLogicalWidthsDirty());
updateFirstLetter();
m_minPreferredLogicalWidth = 0;
m_maxPreferredLogicalWidth = 0;
const 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 = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMinWidth().value()));
m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMinWidth().value()));
}
if (styleToUse.logicalMaxWidth().isFixed()) {
m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMaxWidth().value()));
m_minPreferredLogicalWidth = std::min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMaxWidth().value()));
}
LayoutUnit borderAndPadding = borderAndPaddingLogicalWidth();
m_minPreferredLogicalWidth += borderAndPadding;
m_maxPreferredLogicalWidth += borderAndPadding;
setPreferredLogicalWidthsDirty(false);
}
void RenderBlock::computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
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;
}
const RenderStyle& childStyle = child->style();
if (child->isFloating() || (is<RenderBox>(*child) && downcast<RenderBox>(*child).avoidsFloats())) {
LayoutUnit floatTotalWidth = floatLeftWidth + floatRightWidth;
if (childStyle.clear() & CLEFT) {
maxLogicalWidth = std::max(floatTotalWidth, maxLogicalWidth);
floatLeftWidth = 0;
}
if (childStyle.clear() & CRIGHT) {
maxLogicalWidth = std::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 (is<RenderBox>(*child) && child->isHorizontalWritingMode() != isHorizontalWritingMode()) {
auto& childBox = downcast<RenderBox>(*child);
LogicalExtentComputedValues computedValues;
childBox.computeLogicalHeight(childBox.borderAndPaddingLogicalHeight(), 0, computedValues);
childMinPreferredLogicalWidth = childMaxPreferredLogicalWidth = computedValues.m_extent;
} else {
childMinPreferredLogicalWidth = child->minPreferredLogicalWidth();
childMaxPreferredLogicalWidth = child->maxPreferredLogicalWidth();
if (is<RenderBlock>(*child)) {
const Length& computedInlineSize = child->style().logicalWidth();
if (computedInlineSize.isMaxContent())
childMinPreferredLogicalWidth = childMaxPreferredLogicalWidth;
else if (computedInlineSize.isMinContent())
childMaxPreferredLogicalWidth = childMinPreferredLogicalWidth;
}
}
LayoutUnit w = childMinPreferredLogicalWidth + margin;
minLogicalWidth = std::max(w, minLogicalWidth);
// IE ignores tables for calculation of nowrap. Makes some sense.
if (nowrap && !child->isTable())
maxLogicalWidth = std::max(w, maxLogicalWidth);
w = childMaxPreferredLogicalWidth + margin;
if (!child->isFloating()) {
if (is<RenderBox>(*child) && downcast<RenderBox>(*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 ? std::max(floatLeftWidth, marginLogicalLeft) : floatLeftWidth + marginLogicalLeft;
LayoutUnit maxRight = marginLogicalRight > 0 ? std::max(floatRightWidth, marginLogicalRight) : floatRightWidth + marginLogicalRight;
w = childMaxPreferredLogicalWidth + maxLeft + maxRight;
w = std::max(w, floatLeftWidth + floatRightWidth);
}
else
maxLogicalWidth = std::max(floatLeftWidth + floatRightWidth, maxLogicalWidth);
floatLeftWidth = floatRightWidth = 0;
}
if (child->isFloating()) {
if (childStyle.floating() == LeftFloat)
floatLeftWidth += w;
else
floatRightWidth += w;
} else
maxLogicalWidth = std::max(w, maxLogicalWidth);
child = child->nextSibling();
}
// Always make sure these values are non-negative.
minLogicalWidth = std::max<LayoutUnit>(0, minLogicalWidth);
maxLogicalWidth = std::max<LayoutUnit>(0, maxLogicalWidth);
maxLogicalWidth = std::max(floatLeftWidth + floatRightWidth, maxLogicalWidth);
}
bool RenderBlock::hasLineIfEmpty() const
{
if (!element())
return false;
if (element()->isRootEditableElement())
return true;
return false;
}
LayoutUnit RenderBlock::lineHeight(bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
{
// Anonymous inline blocks don't include margins or any real line height.
if (isAnonymousInlineBlock() && linePositionMode == PositionOnContainingLine)
return direction == HorizontalLine ? height() : width();
// 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 && view().usesFirstLineRules()) {
RenderStyle& s = firstLine ? firstLineStyle() : style();
if (&s != &style())
return s.computedLineHeight();
}
return style().computedLineHeight();
}
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) {
if (isAnonymousInlineBlock())
return direction == HorizontalLine ? height() : width();
// 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).
bool ignoreBaseline = (layer() && (layer()->marquee() || (direction == HorizontalLine ? (layer()->verticalScrollbar() || layer()->scrollOffset().y() != 0)
: (layer()->horizontalScrollbar() || layer()->scrollOffset().x() != 0)))) || (isWritingModeRoot() && !isRubyRun());
Optional<int> baselinePos = ignoreBaseline ? Optional<int>() : inlineBlockBaseline(direction);
if (isDeprecatedFlexibleBox()) {
// Historically, we did this check for all baselines. But we can't
// remove this code from deprecated flexbox, because it effectively
// breaks -webkit-line-clamp, which is used in the wild -- we would
// calculate the baseline as if -webkit-line-clamp wasn't used.
// For simplicity, we use this for all uses of deprecated flexbox.
LayoutUnit bottomOfContent = direction == HorizontalLine ? borderTop() + paddingTop() + contentHeight() : borderRight() + paddingRight() + contentWidth();
if (baselinePos && baselinePos.value() > bottomOfContent)
baselinePos = Optional<int>();
}
if (baselinePos)
return direction == HorizontalLine ? marginTop() + baselinePos.value() : marginRight() + baselinePos.value();
return RenderBox::baselinePosition(baselineType, firstLine, direction, linePositionMode);
}
const RenderStyle& style = firstLine ? firstLineStyle() : this->style();
const FontMetrics& fontMetrics = style.fontMetrics();
return fontMetrics.ascent(baselineType) + (lineHeight(firstLine, direction, linePositionMode) - fontMetrics.height()) / 2;
}
LayoutUnit RenderBlock::minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const
{
if (!document().inNoQuirksMode() && replacedHeight)
return replacedHeight;
const RenderStyle& style = isFirstLine ? firstLineStyle() : this->style();
if (!(style.lineBoxContain() & LineBoxContainBlock))
return 0;
return std::max<LayoutUnit>(replacedHeight, lineHeight(isFirstLine, isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes));
}
Optional<int> RenderBlock::firstLineBaseline() const
{
if (isWritingModeRoot() && !isRubyRun())
return Optional<int>();
for (RenderBox* curr = firstChildBox(); curr; curr = curr->nextSiblingBox()) {
if (!curr->isFloatingOrOutOfFlowPositioned()) {
if (Optional<int> result = curr->firstLineBaseline())
return Optional<int>(curr->logicalTop() + result.value()); // Translate to our coordinate space.
}
}
return Optional<int>();
}
Optional<int> RenderBlock::inlineBlockBaseline(LineDirectionMode lineDirection) const
{
if (isWritingModeRoot() && !isRubyRun())
return Optional<int>();
bool haveNormalFlowChild = false;
for (auto* box = lastChildBox(); box; box = box->previousSiblingBox()) {
if (box->isFloatingOrOutOfFlowPositioned())
continue;
haveNormalFlowChild = true;
if (Optional<int> result = box->inlineBlockBaseline(lineDirection))
return Optional<int>(box->logicalTop() + result.value()); // Translate to our coordinate space.
}
if (!haveNormalFlowChild && hasLineIfEmpty()) {
auto& fontMetrics = firstLineStyle().fontMetrics();
return Optional<int>(fontMetrics.ascent()
+ (lineHeight(true, lineDirection, PositionOfInteriorLineBoxes) - fontMetrics.height()) / 2
+ (lineDirection == HorizontalLine ? borderTop() + paddingTop() : borderRight() + paddingRight()));
}
return Optional<int>();
}
static inline bool isRenderBlockFlowOrRenderButton(RenderElement& renderElement)
{
// We include isRenderButton in this check because buttons are implemented
// using flex box but should still support first-line|first-letter.
// The flex box and specs require that flex box and grid do not support
// first-line|first-letter, though.
// FIXME: Remove when buttons are implemented with align-items instead of
// flex box.
return renderElement.isRenderBlockFlow() || renderElement.isRenderButton();
}
RenderBlock* RenderBlock::firstLineBlock() const
{
RenderBlock* firstLineBlock = const_cast<RenderBlock*>(this);
bool hasPseudo = false;
while (true) {
hasPseudo = firstLineBlock->style().hasPseudoStyle(FIRST_LINE);
if (hasPseudo)
break;
RenderElement* parentBlock = firstLineBlock->parent();
if (firstLineBlock->isReplaced() || firstLineBlock->isFloating()
|| !parentBlock || parentBlock->firstChild() != firstLineBlock || !isRenderBlockFlowOrRenderButton(*parentBlock))
break;
firstLineBlock = downcast<RenderBlock>(parentBlock);
}
if (!hasPseudo)
return nullptr;
return firstLineBlock;
}
static RenderStyle& styleForFirstLetter(RenderElement* firstLetterBlock, RenderObject* firstLetterContainer)
{
RenderStyle* pseudoStyle = firstLetterBlock->getCachedPseudoStyle(FIRST_LETTER, &firstLetterContainer->firstLineStyle());
// If we have an initial letter drop that is >= 1, then we need to force floating to be on.
if (pseudoStyle->initialLetterDrop() >= 1 && !pseudoStyle->isFloating())
pseudoStyle->setFloating(pseudoStyle->isLeftToRightDirection() ? LeftFloat : RightFloat);
// We have to compute the correct font-size for the first-letter if it has an initial letter height set.
RenderObject* paragraph = firstLetterContainer->isRenderBlockFlow() ? firstLetterContainer : firstLetterContainer->containingBlock();
if (pseudoStyle->initialLetterHeight() >= 1 && pseudoStyle->fontMetrics().hasCapHeight() && paragraph->style().fontMetrics().hasCapHeight()) {
// FIXME: For ideographic baselines, we want to go from line edge to line edge. This is equivalent to (N-1)*line-height + the font height.
// We don't yet support ideographic baselines.
// For an N-line first-letter and for alphabetic baselines, the cap-height of the first letter needs to equal (N-1)*line-height of paragraph lines + cap-height of the paragraph
// Mathematically we can't rely on font-size, since font().height() doesn't necessarily match. For reliability, the best approach is simply to
// compare the final measured cap-heights of the two fonts in order to get to the closest possible value.
pseudoStyle->setLineBoxContain(LineBoxContainInitialLetter);
int lineHeight = paragraph->style().computedLineHeight();
// Set the font to be one line too big and then ratchet back to get to a precise fit. We can't just set the desired font size based off font height metrics
// because many fonts bake ascent into the font metrics. Therefore we have to look at actual measured cap height values in order to know when we have a good fit.
auto newFontDescription = pseudoStyle->fontDescription();
float capRatio = pseudoStyle->fontMetrics().floatCapHeight() / pseudoStyle->fontSize();
float startingFontSize = ((pseudoStyle->initialLetterHeight() - 1) * lineHeight + paragraph->style().fontMetrics().capHeight()) / capRatio;
newFontDescription.setSpecifiedSize(startingFontSize);
newFontDescription.setComputedSize(startingFontSize);
pseudoStyle->setFontDescription(newFontDescription);
pseudoStyle->fontCascade().update(pseudoStyle->fontCascade().fontSelector());
int desiredCapHeight = (pseudoStyle->initialLetterHeight() - 1) * lineHeight + paragraph->style().fontMetrics().capHeight();
int actualCapHeight = pseudoStyle->fontMetrics().capHeight();
while (actualCapHeight > desiredCapHeight) {
auto newFontDescription = pseudoStyle->fontDescription();
newFontDescription.setSpecifiedSize(newFontDescription.specifiedSize() - 1);
newFontDescription.setComputedSize(newFontDescription.computedSize() -1);
pseudoStyle->setFontDescription(newFontDescription);
pseudoStyle->fontCascade().update(pseudoStyle->fontCascade().fontSelector());
actualCapHeight = pseudoStyle->fontMetrics().capHeight();
}
}
// 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)
{
return U_GET_GC_MASK(c) & (U_GC_PS_MASK | U_GC_PE_MASK | U_GC_PI_MASK | U_GC_PF_MASK | U_GC_PO_MASK);
}
static inline bool shouldSkipForFirstLetter(UChar c)
{
return isSpaceOrNewline(c) || c == noBreakSpace || isPunctuationForFirstLetter(c);
}
static inline RenderBlock* findFirstLetterBlock(RenderBlock* start)
{
RenderBlock* firstLetterBlock = start;
while (true) {
bool canHaveFirstLetterRenderer = firstLetterBlock->style().hasPseudoStyle(FIRST_LETTER)
&& firstLetterBlock->canHaveGeneratedChildren()
&& isRenderBlockFlowOrRenderButton(*firstLetterBlock);
if (canHaveFirstLetterRenderer)
return firstLetterBlock;
RenderElement* parentBlock = firstLetterBlock->parent();
if (firstLetterBlock->isReplaced() || !parentBlock || parentBlock->firstChild() != firstLetterBlock
|| !isRenderBlockFlowOrRenderButton(*parentBlock))
return nullptr;
firstLetterBlock = downcast<RenderBlock>(parentBlock);
}
return nullptr;
}
void RenderBlock::updateFirstLetterStyle(RenderElement* firstLetterBlock, RenderObject* currentChild)
{
RenderElement* firstLetter = currentChild->parent();
RenderElement* firstLetterContainer = firstLetter->parent();
RenderStyle& pseudoStyle = styleForFirstLetter(firstLetterBlock, firstLetterContainer);
ASSERT(firstLetter->isFloating() || firstLetter->isInline());
if (Style::determineChange(firstLetter->style(), pseudoStyle) == Style::Detach) {
// The first-letter renderer needs to be replaced. Create a new renderer of the right type.
RenderBoxModelObject* newFirstLetter;
if (pseudoStyle.display() == INLINE)
newFirstLetter = new RenderInline(document(), RenderStyle::clone(pseudoStyle));
else
newFirstLetter = new RenderBlockFlow(document(), RenderStyle::clone(pseudoStyle));
newFirstLetter->initializeStyle();
// Move the first letter into the new renderer.
LayoutStateDisabler layoutStateDisabler(view());
while (RenderObject* child = firstLetter->firstChild()) {
if (is<RenderText>(*child))
downcast<RenderText>(*child).removeAndDestroyTextBoxes();
firstLetter->removeChild(*child);
newFirstLetter->addChild(child, nullptr);
}
RenderObject* nextSibling = firstLetter->nextSibling();
if (RenderTextFragment* remainingText = downcast<RenderBoxModelObject>(*firstLetter).firstLetterRemainingText()) {
ASSERT(remainingText->isAnonymous() || remainingText->textNode()->renderer() == remainingText);
// Replace the old renderer with the new one.
remainingText->setFirstLetter(*newFirstLetter);
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->removeChildInternal(*firstLetter, NotifyChildren);
firstLetter->destroy();
firstLetter = newFirstLetter;
firstLetterContainer->addChild(firstLetter, nextSibling);
} else
firstLetter->setStyle(RenderStyle::clone(pseudoStyle));
}
void RenderBlock::createFirstLetterRenderer(RenderElement* firstLetterBlock, RenderText* currentTextChild)
{
RenderElement* firstLetterContainer = currentTextChild->parent();
RenderStyle& pseudoStyle = styleForFirstLetter(firstLetterBlock, firstLetterContainer);
RenderBoxModelObject* firstLetter = nullptr;
if (pseudoStyle.display() == INLINE)
firstLetter = new RenderInline(document(), RenderStyle::clone(pseudoStyle));
else
firstLetter = new RenderBlockFlow(document(), RenderStyle::clone(pseudoStyle));
firstLetter->initializeStyle();
firstLetterContainer->addChild(firstLetter, currentTextChild);
// 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.
String oldText = currentTextChild->originalText();
ASSERT(!oldText.isNull());
if (!oldText.isEmpty()) {
unsigned length = 0;
// Account for leading spaces and punctuation.
while (length < oldText.length() && shouldSkipForFirstLetter(oldText[length]))
length++;
// Account for first grapheme cluster.
length += numCharactersInGraphemeClusters(StringView(oldText).substring(length), 1);
// 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;
if (currentTextChild->textNode())
remainingText = new RenderTextFragment(*currentTextChild->textNode(), oldText, length, oldText.length() - length);
else
remainingText = new RenderTextFragment(document(), oldText, length, oldText.length() - length);
if (remainingText->textNode())
remainingText->textNode()->setRenderer(remainingText);
firstLetterContainer->addChild(remainingText, currentTextChild);
firstLetterContainer->removeChild(*currentTextChild);
remainingText->setFirstLetter(*firstLetter);
firstLetter->setFirstLetterRemainingText(remainingText);
// construct text fragment for the first letter
RenderTextFragment* letter;
if (remainingText->textNode())
letter = new RenderTextFragment(*remainingText->textNode(), oldText, 0, length);
else
letter = new RenderTextFragment(document(), oldText, 0, length);
firstLetter->addChild(letter);
currentTextChild->destroy();
}
}
void RenderBlock::getFirstLetter(RenderObject*& firstLetter, RenderElement*& firstLetterContainer, RenderObject* skipObject)
{
firstLetter = nullptr;
firstLetterContainer = nullptr;
if (!view().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.
firstLetterContainer = findFirstLetterBlock(this);
if (!firstLetterContainer)
return;
// Drill into inlines looking for our first text descendant.
firstLetter = firstLetterContainer->firstChild();
while (firstLetter) {
if (is<RenderText>(*firstLetter)) {
if (firstLetter == skipObject) {
firstLetter = firstLetter->nextSibling();
continue;
}
break;
}
RenderElement& current = downcast<RenderElement>(*firstLetter);
if (is<RenderListMarker>(current))
firstLetter = current.nextSibling();
else if (current.isFloatingOrOutOfFlowPositioned()) {
if (current.style().styleType() == FIRST_LETTER) {
firstLetter = current.firstChild();
break;
}
firstLetter = current.nextSibling();
} else if (current.isReplaced() || is<RenderButton>(current) || is<RenderMenuList>(current))
break;
else if (current.isFlexibleBoxIncludingDeprecated()
#if ENABLE(CSS_GRID_LAYOUT)
|| current.isRenderGrid()
#endif
)
firstLetter = current.nextSibling();
else if (current.style().hasPseudoStyle(FIRST_LETTER) && current.canHaveGeneratedChildren()) {
// We found a lower-level node with first-letter, which supersedes the higher-level style
firstLetterContainer = &current;
firstLetter = current.firstChild();
} else
firstLetter = current.firstChild();
}
if (!firstLetter)
firstLetterContainer = nullptr;
}
void RenderBlock::updateFirstLetter()
{
RenderObject* firstLetterObj;
RenderElement* firstLetterContainer;
// FIXME: The first letter might be composed of a variety of code units, and therefore might
// be contained within multiple RenderElements.
getFirstLetter(firstLetterObj, firstLetterContainer);
if (!firstLetterObj || !firstLetterContainer)
return;
// If the child already has style, then it has already been created, so we just want
// to update it.
if (firstLetterObj->parent()->style().styleType() == FIRST_LETTER) {
updateFirstLetterStyle(firstLetterContainer, firstLetterObj);
return;
}
if (!is<RenderText>(*firstLetterObj))
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(firstLetterContainer, downcast<RenderText>(firstLetterObj));
}
RenderFlowThread* RenderBlock::cachedFlowThreadContainingBlock() const
{
RenderBlockRareData* rareData = getBlockRareData(this);
if (!rareData || !rareData->m_flowThreadContainingBlock)
return nullptr;
return rareData->m_flowThreadContainingBlock.value();
}
bool RenderBlock::cachedFlowThreadContainingBlockNeedsUpdate() const
{
RenderBlockRareData* rareData = getBlockRareData(this);
if (!rareData || !rareData->m_flowThreadContainingBlock)
return true;
return false;
}
void RenderBlock::setCachedFlowThreadContainingBlockNeedsUpdate()
{
RenderBlockRareData& rareData = ensureBlockRareData(this);
rareData.m_flowThreadContainingBlock = Nullopt;
}
RenderFlowThread* RenderBlock::updateCachedFlowThreadContainingBlock(RenderFlowThread* flowThread) const
{
RenderBlockRareData& rareData = ensureBlockRareData(this);
rareData.m_flowThreadContainingBlock = flowThread;
return flowThread;
}
RenderFlowThread* RenderBlock::locateFlowThreadContainingBlock() const
{
RenderBlockRareData* rareData = getBlockRareData(this);
if (!rareData || !rareData->m_flowThreadContainingBlock)
return updateCachedFlowThreadContainingBlock(RenderBox::locateFlowThreadContainingBlock());
ASSERT(rareData->m_flowThreadContainingBlock.value() == RenderBox::locateFlowThreadContainingBlock());
return rareData->m_flowThreadContainingBlock.value();
}
LayoutUnit RenderBlock::paginationStrut() const
{
RenderBlockRareData* rareData = getBlockRareData(this);
return rareData ? rareData->m_paginationStrut : LayoutUnit();
}
LayoutUnit RenderBlock::pageLogicalOffset() const
{
RenderBlockRareData* rareData = getBlockRareData(this);
return rareData ? rareData->m_pageLogicalOffset : LayoutUnit();
}
void RenderBlock::setPaginationStrut(LayoutUnit strut)
{
RenderBlockRareData* rareData = getBlockRareData(this);
if (!rareData) {
if (!strut)
return;
rareData = &ensureBlockRareData(this);
}
rareData->m_paginationStrut = strut;
}
void RenderBlock::setPageLogicalOffset(LayoutUnit logicalOffset)
{
RenderBlockRareData* rareData = getBlockRareData(this);
if (!rareData) {
if (!logicalOffset)
return;
rareData = &ensureBlockRareData(this);
}
rareData->m_pageLogicalOffset = logicalOffset;
}
void RenderBlock::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
// For blocks inside inlines, we 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(snappedIntRect(accumulatedOffset.x(), accumulatedOffset.y() - collapsedMarginBefore(),
width(), height() + collapsedMarginBefore() + collapsedMarginAfter()));
continuation()->absoluteRects(rects, accumulatedOffset - toLayoutSize(location() +
inlineElementContinuation()->containingBlock()->location()));
} else
rects.append(snappedIntRect(accumulatedOffset, size()));
}
void RenderBlock::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
// For blocks inside inlines, we 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).
FloatRect localRect = isAnonymousBlockContinuation()
? FloatRect(0, -collapsedMarginBefore(), width(), height() + collapsedMarginBefore() + collapsedMarginAfter())
: FloatRect(0, 0, width(), height());
// FIXME: This is wrong for block-flows that are horizontal.
// https://bugs.webkit.org/show_bug.cgi?id=46781
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread || !flowThread->absoluteQuadsForBox(quads, wasFixed, this, localRect.y(), localRect.maxY()))
quads.append(localToAbsoluteQuad(localRect, UseTransforms, wasFixed));
if (isAnonymousBlockContinuation())
continuation()->absoluteQuads(quads, 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;
}
RenderElement* RenderBlock::hoverAncestor() const
{
return isAnonymousBlockContinuation() ? continuation() : RenderBox::hoverAncestor();
}
void RenderBlock::updateDragState(bool dragOn)
{
RenderBox::updateDragState(dragOn);
if (RenderBoxModelObject* continuation = this->continuation())
continuation->updateDragState(dragOn);
}
const RenderStyle& RenderBlock::outlineStyleForRepaint() const
{
return isAnonymousBlockContinuation() ? continuation()->style() : RenderElement::outlineStyleForRepaint();
}
void RenderBlock::childBecameNonInline(RenderElement&)
{
makeChildrenNonInline();
if (isAnonymousBlock() && is<RenderBlock>(parent()))
downcast<RenderBlock>(*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());
// FIXME: Does this need to adjust for vertical orientation?
if (extraWidthToEndOfLine)
*extraWidthToEndOfLine = width() - caretRect.maxX();
return caretRect;
}
void RenderBlock::addFocusRingRectsForInlineChildren(Vector<LayoutRect>&, const LayoutPoint&, const RenderLayerModelObject*)
{
ASSERT_NOT_REACHED();
}
void RenderBlock::addFocusRingRects(Vector<LayoutRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer)
{
// For blocks inside inlines, we 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 = downcast<RenderInline>(*inlineElementContinuation()->element()->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(rect);
} else if (width() && height())
rects.append(LayoutRect(additionalOffset, size()));
if (!hasOverflowClip() && !hasControlClip()) {
if (childrenInline())
addFocusRingRectsForInlineChildren(rects, additionalOffset, paintContainer);
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!is<RenderText>(*child) && !is<RenderListMarker>(*child) && is<RenderBox>(*child)) {
auto& box = downcast<RenderBox>(*child);
FloatPoint pos;
// FIXME: This doesn't work correctly with transforms.
if (box.layer())
pos = child->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(LayoutPoint(additionalOffset + inlineElementContinuation()->containingBlock()->location() - location())), paintContainer);
}
RenderBox* RenderBlock::createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const
{
return createAnonymousWithParentRendererAndDisplay(parent, style().display());
}
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(this, offsetFromLogicalTopOfFirstPage() + blockOffset, true);
}
static bool canComputeRegionRangeForBox(const RenderBlock* parentBlock, const RenderBox& childBox, const RenderFlowThread* flowThreadContainingBlock)
{
ASSERT(parentBlock);
ASSERT(!childBox.isRenderNamedFlowThread());
if (!flowThreadContainingBlock)
return false;
if (!flowThreadContainingBlock->hasRegions())
return false;
if (!childBox.canHaveOutsideRegionRange())
return false;
return flowThreadContainingBlock->hasCachedRegionRangeForBox(parentBlock);
}
bool RenderBlock::childBoxIsUnsplittableForFragmentation(const RenderBox& child) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
bool checkColumnBreaks = flowThread && flowThread->shouldCheckColumnBreaks();
bool checkPageBreaks = !checkColumnBreaks && view().layoutState()->m_pageLogicalHeight;
bool checkRegionBreaks = flowThread && flowThread->isRenderNamedFlowThread();
return child.isUnsplittableForPagination() || child.style().breakInside() == AvoidBreakInside
|| (checkColumnBreaks && child.style().breakInside() == AvoidColumnBreakInside)
|| (checkPageBreaks && child.style().breakInside() == AvoidPageBreakInside)
|| (checkRegionBreaks && child.style().breakInside() == AvoidRegionBreakInside);
}
void RenderBlock::computeRegionRangeForBoxChild(const RenderBox& box) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
ASSERT(canComputeRegionRangeForBox(this, box, flowThread));
RenderRegion* startRegion;
RenderRegion* endRegion;
LayoutUnit offsetFromLogicalTopOfFirstRegion = box.offsetFromLogicalTopOfFirstPage();
if (childBoxIsUnsplittableForFragmentation(box))
startRegion = endRegion = flowThread->regionAtBlockOffset(this, offsetFromLogicalTopOfFirstRegion, true);
else {
startRegion = flowThread->regionAtBlockOffset(this, offsetFromLogicalTopOfFirstRegion, true);
endRegion = flowThread->regionAtBlockOffset(this, offsetFromLogicalTopOfFirstRegion + logicalHeightForChild(box), true);
}
flowThread->setRegionRangeForBox(&box, startRegion, endRegion);
}
void RenderBlock::estimateRegionRangeForBoxChild(const RenderBox& box) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!canComputeRegionRangeForBox(this, box, flowThread))
return;
if (childBoxIsUnsplittableForFragmentation(box)) {
computeRegionRangeForBoxChild(box);
return;
}
LogicalExtentComputedValues estimatedValues;
box.computeLogicalHeight(RenderFlowThread::maxLogicalHeight(), logicalTopForChild(box), estimatedValues);
LayoutUnit offsetFromLogicalTopOfFirstRegion = box.offsetFromLogicalTopOfFirstPage();
RenderRegion* startRegion = flowThread->regionAtBlockOffset(this, offsetFromLogicalTopOfFirstRegion, true);
RenderRegion* endRegion = flowThread->regionAtBlockOffset(this, offsetFromLogicalTopOfFirstRegion + estimatedValues.m_extent, true);
flowThread->setRegionRangeForBox(&box, startRegion, endRegion);
}
bool RenderBlock::updateRegionRangeForBoxChild(const RenderBox& box) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!canComputeRegionRangeForBox(this, box, flowThread))
return false;
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
flowThread->getRegionRangeForBox(&box, startRegion, endRegion);
computeRegionRangeForBoxChild(box);
RenderRegion* newStartRegion = nullptr;
RenderRegion* newEndRegion = nullptr;
flowThread->getRegionRangeForBox(&box, newStartRegion, newEndRegion);
// Changing the start region means we shift everything and a relayout is needed.
if (newStartRegion != startRegion)
return true;
// The region range of the box has changed. Some boxes (e.g floats) may have been positioned assuming
// a different range.
if (box.needsLayoutAfterRegionRangeChange() && newEndRegion != endRegion)
return true;
return false;
}
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 is<RenderBlock>(child) ? downcast<RenderBlock>(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 is<RenderBlock>(child) ? downcast<RenderBlock>(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 is<RenderBlock>(child) ? downcast<RenderBlock>(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 is<RenderBlock>(child) ? downcast<RenderBlock>(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;
}
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 (isAnonymousBlock())
return "RenderBlock (anonymous)";
if (isAnonymousInlineBlock())
return "RenderBlock (anonymous inline-block)";
// 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)";
return "RenderBlock";
}
TextRun RenderBlock::constructTextRun(StringView stringView, const RenderStyle& style, ExpansionBehavior expansion, TextRunFlags flags)
{
TextDirection textDirection = LTR;
bool directionalOverride = style.rtlOrdering() == VisualOrder;
if (flags != DefaultTextRunFlags) {
if (flags & RespectDirection)
textDirection = style.direction();
if (flags & RespectDirectionOverride)
directionalOverride |= isOverride(style.unicodeBidi());
}
return TextRun(stringView, 0, 0, expansion, textDirection, directionalOverride);
}
TextRun RenderBlock::constructTextRun(const String& string, const RenderStyle& style, ExpansionBehavior expansion, TextRunFlags flags)
{
return constructTextRun(StringView(string), style, expansion, flags);
}
TextRun RenderBlock::constructTextRun(const RenderText* text, const RenderStyle& style, ExpansionBehavior expansion)
{
return constructTextRun(text->stringView(), style, expansion);
}
TextRun RenderBlock::constructTextRun(const RenderText* text, unsigned offset, unsigned length, const RenderStyle& style, ExpansionBehavior expansion)
{
unsigned stop = offset + length;
ASSERT(stop <= text->textLength());
return constructTextRun(text->stringView(offset, stop), style, expansion);
}
TextRun RenderBlock::constructTextRun(const LChar* characters, int length, const RenderStyle& style, ExpansionBehavior expansion)
{
return constructTextRun(StringView(characters, length), style, expansion);
}
TextRun RenderBlock::constructTextRun(const UChar* characters, int length, const RenderStyle& style, ExpansionBehavior expansion)
{
return constructTextRun(StringView(characters, length), style, expansion);
}
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 ?
RenderBlock* newBox;
if (display == FLEX || display == INLINE_FLEX)
newBox = new RenderFlexibleBox(parent->document(), RenderStyle::createAnonymousStyleWithDisplay(parent->style(), FLEX));
else
newBox = new RenderBlockFlow(parent->document(), RenderStyle::createAnonymousStyleWithDisplay(parent->style(), BLOCK));
newBox->initializeStyle();
return newBox;
}
#ifndef NDEBUG
void RenderBlock::checkPositionedObjectsNeedLayout()
{
if (!gPositionedDescendantsMap)
return;
TrackedRendererListHashSet* positionedDescendantSet = positionedObjects();
if (!positionedDescendantSet)
return;
for (auto it = positionedDescendantSet->begin(), end = positionedDescendantSet->end(); it != end; ++it) {
RenderBox* currBox = *it;
ASSERT(!currBox->needsLayout());
}
}
#endif
} // namespace WebCore