blob: dcfd0ef99109a074f498603e13b9f694fd61c70a [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 "DocumentInlines.h"
#include "Editor.h"
#include "Element.h"
#include "ElementInlines.h"
#include "EventRegion.h"
#include "FloatQuad.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLNames.h"
#include "HTMLTextFormControlElement.h"
#include "HitTestLocation.h"
#include "HitTestResult.h"
#include "ImageBuffer.h"
#include "InlineIteratorInlineBox.h"
#include "InlineWalker.h"
#include "LayoutRepainter.h"
#include "LegacyInlineElementBox.h"
#include "LegacyInlineTextBox.h"
#include "Logging.h"
#include "LogicalSelectionOffsetCaches.h"
#include "OverflowEvent.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderBlockFlow.h"
#include "RenderBoxFragmentInfo.h"
#include "RenderButton.h"
#include "RenderChildIterator.h"
#include "RenderCombineText.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderFlexibleBox.h"
#include "RenderFragmentedFlow.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderLayerScrollableArea.h"
#include "RenderLayoutState.h"
#include "RenderListMarker.h"
#include "RenderMenuList.h"
#include "RenderTableCell.h"
#include "RenderTextControl.h"
#include "RenderTextFragment.h"
#include "RenderTheme.h"
#include "RenderTreeBuilder.h"
#include "RenderTreePosition.h"
#include "RenderView.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "ShapeOutsideInfo.h"
#include "TransformState.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/SetForScope.h>
#include <wtf/StackStats.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
using namespace HTMLNames;
using namespace WTF::Unicode;
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderBlock);
struct SameSizeAsRenderBlock : public RenderBox {
};
static_assert(sizeof(RenderBlock) == sizeof(SameSizeAsRenderBlock), "RenderBlock should stay small");
typedef HashMap<const RenderBlock*, std::unique_ptr<TrackedRendererListHashSet>> TrackedDescendantsMap;
typedef HashMap<const RenderBox*, HashSet<const RenderBlock*>> TrackedContainerMap;
static TrackedDescendantsMap* percentHeightDescendantsMap;
static TrackedContainerMap* percentHeightContainerMap;
static void insertIntoTrackedRendererMaps(const RenderBlock& container, RenderBox& descendant)
{
if (!percentHeightDescendantsMap) {
percentHeightDescendantsMap = new TrackedDescendantsMap;
percentHeightContainerMap = new TrackedContainerMap;
}
auto& descendantSet = percentHeightDescendantsMap->ensure(&container, [] {
return makeUnique<TrackedRendererListHashSet>();
}).iterator->value;
bool added = descendantSet->add(&descendant).isNewEntry;
if (!added) {
#if ASSERT_ENABLED
auto it = percentHeightContainerMap->find(&descendant);
ASSERT(it != percentHeightContainerMap->end());
ASSERT(it->value.contains(&container));
#endif
return;
}
auto& containerSet = percentHeightContainerMap->add(&descendant, HashSet<const RenderBlock*>()).iterator->value;
ASSERT(!containerSet.contains(&container));
containerSet.add(&container);
}
static void removeFromTrackedRendererMaps(RenderBox& descendant)
{
if (!percentHeightDescendantsMap)
return;
HashSet<const RenderBlock*> containerSet = percentHeightContainerMap->take(&descendant);
for (auto* container : containerSet) {
// 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));
auto descendantsMapIterator = percentHeightDescendantsMap->find(container);
ASSERT(descendantsMapIterator != percentHeightDescendantsMap->end());
if (descendantsMapIterator == percentHeightDescendantsMap->end())
continue;
auto& descendantSet = descendantsMapIterator->value;
ASSERT(descendantSet->contains(&descendant));
descendantSet->remove(&descendant);
if (descendantSet->isEmpty())
percentHeightDescendantsMap->remove(descendantsMapIterator);
}
}
class PositionedDescendantsMap {
public:
void addDescendant(const RenderBlock& containingBlock, RenderBox& positionedDescendant)
{
// Protect against double insert where a descendant would end up with multiple containing blocks.
auto* previousContainingBlock = m_containerMap.get(&positionedDescendant);
if (previousContainingBlock && previousContainingBlock != &containingBlock) {
if (auto* descendants = m_descendantsMap.get(previousContainingBlock))
descendants->remove(&positionedDescendant);
}
auto& descendants = m_descendantsMap.ensure(&containingBlock, [] {
return makeUnique<TrackedRendererListHashSet>();
}).iterator->value;
auto isNewEntry = false;
if (!is<RenderView>(containingBlock) || descendants->isEmpty())
isNewEntry = descendants->add(&positionedDescendant).isNewEntry;
else if (positionedDescendant.isFixedPositioned() || isInTopLayerOrBackdrop(positionedDescendant.style(), positionedDescendant.element()))
isNewEntry = descendants->appendOrMoveToLast(&positionedDescendant).isNewEntry;
else {
auto ensureLayoutDepentBoxPosition = [&] {
// RenderView is a special containing block as it may hold both absolute and fixed positioned containing blocks.
// When a fixed positioned box is also a descendant of an absolute positioned box anchored to the RenderView,
// we have to make sure that the absolute positioned box is inserted before the fixed box to follow
// block layout dependency.
for (auto it = descendants->begin(); it != descendants->end(); ++it) {
if ((*it)->isFixedPositioned()) {
isNewEntry = descendants->insertBefore(it, &positionedDescendant).isNewEntry;
return;
}
}
isNewEntry = descendants->appendOrMoveToLast(&positionedDescendant).isNewEntry;
};
ensureLayoutDepentBoxPosition();
}
if (!isNewEntry) {
ASSERT(m_containerMap.contains(&positionedDescendant));
return;
}
m_containerMap.set(&positionedDescendant, &containingBlock);
}
void removeDescendant(const RenderBox& positionedDescendant)
{
auto* containingBlock = m_containerMap.take(&positionedDescendant);
if (!containingBlock)
return;
auto descendantsIterator = m_descendantsMap.find(containingBlock);
ASSERT(descendantsIterator != m_descendantsMap.end());
if (descendantsIterator == m_descendantsMap.end())
return;
auto& descendants = descendantsIterator->value;
ASSERT(descendants->contains(const_cast<RenderBox*>(&positionedDescendant)));
descendants->remove(const_cast<RenderBox*>(&positionedDescendant));
if (descendants->isEmpty())
m_descendantsMap.remove(descendantsIterator);
}
void removeContainingBlock(const RenderBlock& containingBlock)
{
auto descendants = m_descendantsMap.take(&containingBlock);
if (!descendants)
return;
for (auto* renderer : *descendants)
m_containerMap.remove(renderer);
}
TrackedRendererListHashSet* positionedRenderers(const RenderBlock& containingBlock) const
{
return m_descendantsMap.get(&containingBlock);
}
private:
using DescendantsMap = HashMap<const RenderBlock*, std::unique_ptr<TrackedRendererListHashSet>>;
using ContainerMap = HashMap<const RenderBox*, const RenderBlock*>;
DescendantsMap m_descendantsMap;
ContainerMap m_containerMap;
};
static PositionedDescendantsMap& positionedDescendantsMap()
{
static NeverDestroyed<PositionedDescendantsMap> mapForPositionedDescendants;
return mapForPositionedDescendants;
}
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()
{
}
LayoutUnit m_paginationStrut;
LayoutUnit m_pageLogicalOffset;
LayoutUnit m_intrinsicBorderForFieldset;
std::optional<WeakPtr<RenderFragmentedFlow>> m_enclosingFragmentedFlow;
};
typedef HashMap<const RenderBlock*, std::unique_ptr<RenderBlockRareData>> RenderBlockRareDataMap;
static RenderBlockRareDataMap* gRareDataMap;
// 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->hasNonVisibleOverflow() && 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 removeBlockFromPercentageDescendantAndContainerMaps(RenderBlock* block)
{
if (!percentHeightDescendantsMap)
return;
std::unique_ptr<TrackedRendererListHashSet> descendantSet = percentHeightDescendantsMap->take(block);
if (!descendantSet)
return;
for (auto* descendant : *descendantSet) {
auto it = percentHeightContainerMap->find(descendant);
ASSERT(it != percentHeightContainerMap->end());
if (it == percentHeightContainerMap->end())
continue;
auto& containerSet = it->value;
ASSERT(containerSet.contains(block));
containerSet.remove(block);
if (containerSet.isEmpty())
percentHeightContainerMap->remove(it);
}
}
RenderBlock::~RenderBlock()
{
// Blocks can be added to gRareDataMap during willBeDestroyed(), so this code can't move there.
if (gRareDataMap)
gRareDataMap->remove(this);
// Do not add any more code here. Add it to willBeDestroyed() instead.
}
// Note that this is not called for RenderBlockFlows.
void RenderBlock::willBeDestroyed()
{
if (!renderTreeBeingDestroyed()) {
if (parent())
parent()->dirtyLinesFromChangedChild(*this);
}
blockWillBeDestroyed();
RenderBox::willBeDestroyed();
}
void RenderBlock::blockWillBeDestroyed()
{
removeFromUpdateScrollInfoAfterLayoutTransaction();
removeBlockFromPercentageDescendantAndContainerMaps(this);
positionedDescendantsMap().removeContainingBlock(*this);
}
bool RenderBlock::hasRareData() const
{
return gRareDataMap ? gRareDataMap->contains(this) : false;
}
void RenderBlock::removePositionedObjectsIfNeeded(const RenderStyle& oldStyle, const RenderStyle& newStyle)
{
bool hadTransform = oldStyle.hasTransformRelatedProperty();
bool willHaveTransform = newStyle.hasTransformRelatedProperty();
bool hadLayoutContainment = oldStyle.containsLayout();
bool willHaveLayoutContainment = newStyle.containsLayout();
if (oldStyle.position() == newStyle.position() && hadTransform == willHaveTransform && hadLayoutContainment == willHaveLayoutContainment)
return;
// We are no longer the containing block for out-of-flow descendants.
bool outOfFlowDescendantsHaveNewContainingBlock = (hadTransform && !willHaveTransform) || (newStyle.position() == PositionType::Static && !willHaveTransform);
if (hadLayoutContainment != willHaveLayoutContainment)
outOfFlowDescendantsHaveNewContainingBlock = hadLayoutContainment && !willHaveLayoutContainment;
if (outOfFlowDescendantsHaveNewContainingBlock) {
// Our out-of-flow descendants will be inserted into a new containing block's positioned objects list during the next layout.
removePositionedObjects(nullptr, NewContainingBlock);
return;
}
// We are a new containing block.
if (oldStyle.position() == PositionType::Static && !hadTransform) {
// 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() == PositionType::Static || (containingBlock->isInline() && !containingBlock->isReplacedOrInlineBlock()))) {
if (containingBlock->style().position() == PositionType::Relative && containingBlock->isInline() && !containingBlock->isReplacedOrInlineBlock()) {
containingBlock = containingBlock->containingBlock();
break;
}
containingBlock = containingBlock->parent();
}
if (containingBlock && is<RenderBlock>(*containingBlock))
downcast<RenderBlock>(*containingBlock).removePositionedObjects(this, NewContainingBlock);
}
}
void RenderBlock::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr;
// FIXME: Should change the expression below to newStyle.display() == DisplayType::InlineBlock.
setReplacedOrInlineBlock(newStyle.isDisplayInlineType());
if (oldStyle)
removePositionedObjectsIfNeeded(*oldStyle, newStyle);
RenderBox::styleWillChange(diff, newStyle);
}
static bool borderOrPaddingLogicalWidthChanged(const RenderStyle& oldStyle, const RenderStyle& newStyle)
{
if (newStyle.isHorizontalWritingMode()) {
return oldStyle.borderLeftWidth() != newStyle.borderLeftWidth()
|| oldStyle.borderRightWidth() != newStyle.borderRightWidth()
|| oldStyle.paddingLeft() != newStyle.paddingLeft()
|| oldStyle.paddingRight() != newStyle.paddingRight();
}
return oldStyle.borderTopWidth() != newStyle.borderTopWidth()
|| oldStyle.borderBottomWidth() != newStyle.borderBottomWidth()
|| oldStyle.paddingTop() != newStyle.paddingTop()
|| oldStyle.paddingBottom() != newStyle.paddingBottom();
}
void RenderBlock::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderBox::styleDidChange(diff, oldStyle);
if (oldStyle)
adjustFragmentedFlowStateOnContainingBlockChangeIfNeeded(*oldStyle, style());
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 == StyleDifference::Layout && needsLayout() && borderOrPaddingLogicalWidthChanged(*oldStyle, style()));
}
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->setFragmentedFlowState(fragmentedFlowState());
return cloneBlock;
}
void RenderBlock::deleteLines()
{
if (AXObjectCache* cache = document().existingAXObjectCache())
cache->deferRecomputeIsIgnored(element());
}
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())
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 !createsNewFormattingContext() && !childrenPreventSelfCollapsing();
return false;
}
static inline UpdateScrollInfoAfterLayoutTransaction* currentUpdateScrollInfoAfterLayoutTransaction()
{
if (!updateScrollInfoAfterLayoutTransactionStack())
return nullptr;
return &updateScrollInfoAfterLayoutTransactionStack()->last();
}
void RenderBlock::beginUpdateScrollInfoAfterLayoutTransaction()
{
if (!updateScrollInfoAfterLayoutTransactionStack())
updateScrollInfoAfterLayoutTransactionStack() = makeUnique<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.
auto blocksToUpdate = copyToVector(transaction->blocks);
updateScrollInfoAfterLayoutTransactionStack()->removeLast();
if (updateScrollInfoAfterLayoutTransactionStack()->isEmpty())
updateScrollInfoAfterLayoutTransactionStack() = nullptr;
for (auto* block : blocksToUpdate) {
ASSERT(block->hasNonVisibleOverflow());
block->layer()->updateScrollInfoAfterLayout();
}
}
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 (!hasNonVisibleOverflow())
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);
// 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 = makeUnique<RenderBlockRareData>();
return *rareData.get();
}
void RenderBlock::preparePaginationBeforeBlockLayout(bool& relayoutChildren)
{
// Fragments changing widths can force us to relayout our children.
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (fragmentedFlow)
fragmentedFlow->logicalWidthChangedInFragmentsForBlock(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 fragments.
if (m_overflow) {
if (RenderFragmentedFlow* containingFragmentedFlow = enclosingFragmentedFlow())
containingFragmentedFlow->addFragmentsVisualOverflow(this, m_overflow->visualOverflowRect());
}
}
// Overflow is always relative to the border-box of the element in question.
// Therefore, if the element has a vertical scrollbar placed on the left, an overflow rect at x=2px would conceptually intersect the scrollbar.
void RenderBlock::computeOverflow(LayoutUnit oldClientAfterEdge, bool)
{
clearOverflow();
addOverflowFromChildren();
addOverflowFromPositionedObjects();
if (hasNonVisibleOverflow()) {
auto includePaddingEnd = [&] {
// As per https://github.com/w3c/csswg-drafts/issues/3653 padding should contribute to the scrollable overflow area.
if (!paddingEnd())
return;
// FIXME: Expand it to non-grid cases when applicable.
if (!is<RenderGrid>(*this))
return;
auto layoutOverflowRect = this->layoutOverflowRect();
auto layoutOverflowLogicalWidthIncludingPaddingEnd = [&] {
if (hasHorizontalLayoutOverflow())
return (isHorizontalWritingMode() ? layoutOverflowRect.width() : layoutOverflowRect.height()) + paddingEnd();
// FIXME: This is not sufficient for BFC layout (missing non-formatting-context root descendants).
auto contentLogicalRight = LayoutUnit { };
for (auto& child : childrenOfType<RenderBox>(*this)) {
if (child.isOutOfFlowPositioned())
continue;
auto childLogicalRight = logicalLeftForChild(child) + logicalWidthForChild(child) + std::max(0_lu, marginEndForChild(child));
contentLogicalRight = std::max(contentLogicalRight, childLogicalRight);
}
auto logicalRightWithPaddingEnd = contentLogicalRight + paddingEnd();
// Use padding box as the reference box.
return logicalRightWithPaddingEnd - (isHorizontalWritingMode() ? borderLeft() : borderTop());
};
if (isHorizontalWritingMode())
layoutOverflowRect.setWidth(layoutOverflowLogicalWidthIncludingPaddingEnd());
else
layoutOverflowRect.setHeight(layoutOverflowLogicalWidthIncludingPaddingEnd());
addLayoutOverflow(layoutOverflowRect);
};
includePaddingEnd();
auto includePaddingAfter = [&] {
// When we have overflow clip, propagate the original spillout since it will include collapsed bottom margins and bottom padding.
auto clientRect = flippedClientBoxRect();
auto rectToApply = clientRect;
// Set the axis we don't care about to be 1, since we want this overflow to always be considered reachable.
if (isHorizontalWritingMode()) {
rectToApply.setWidth(1);
rectToApply.setHeight(std::max(0_lu, oldClientAfterEdge - clientRect.y()));
} else {
rectToApply.setWidth(std::max(0_lu, oldClientAfterEdge - clientRect.x()));
rectToApply.setHeight(1);
}
addLayoutOverflow(rectToApply);
};
includePaddingAfter();
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 fragments 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() != PositionType::Fixed)
addOverflowFromChild(positionedObject, { positionedObject->x(), positionedObject->y() });
}
}
void RenderBlock::addVisualOverflowFromTheme()
{
if (!style().hasEffectiveAppearance())
return;
FloatRect inflatedRect = borderBoxRect();
theme().adjustRepaintRect(*this, inflatedRect);
addVisualOverflow(snappedIntRect(LayoutRect(inflatedRect)));
if (RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow())
fragmentedFlow->addFragmentsVisualOverflowFromTheme(this);
}
LayoutUnit RenderBlock::computeStartPositionDeltaForChildAvoidingFloats(const RenderBox& child, LayoutUnit childMarginStart, RenderFragmentContainer* fragment)
{
LayoutUnit startPosition = startOffsetForContent(fragment);
// Add in our start margin.
LayoutUnit oldPosition = startPosition + childMarginStart;
LayoutUnit newPosition = oldPosition;
LayoutUnit blockOffset = logicalTopForChild(child);
if (fragment)
blockOffset = std::max(blockOffset, blockOffset + (fragment->logicalTopForFragmentedFlowContent() - offsetFromLogicalTopOfFirstPage()));
LayoutUnit startOff = startOffsetForLineInFragment(blockOffset, DoNotIndentText, fragment, logicalHeightForChild(child));
if (style().textAlign() != TextAlignMode::WebKitCenter && !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().frameView().layoutContext().addLayoutDelta(LayoutSize(child.x() - logicalLeft, 0_lu));
child.setX(logicalLeft);
} else {
if (applyDelta == ApplyLayoutDelta)
view().frameView().layoutContext().addLayoutDelta(LayoutSize(0_lu, child.y() - logicalLeft));
child.setY(logicalLeft);
}
}
void RenderBlock::setLogicalTopForChild(RenderBox& child, LayoutUnit logicalTop, ApplyLayoutDeltaMode applyDelta)
{
if (isHorizontalWritingMode()) {
if (applyDelta == ApplyLayoutDelta)
view().frameView().layoutContext().addLayoutDelta(LayoutSize(0_lu, child.y() - logicalTop));
child.setY(logicalTop);
} else {
if (applyDelta == ApplyLayoutDelta)
view().frameView().layoutContext().addLayoutDelta(LayoutSize(child.x() - logicalTop, 0_lu));
child.setX(logicalTop);
}
}
void RenderBlock::updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox& child)
{
if (child.isOutOfFlowPositioned())
return;
// 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 (!percentHeightDescendantsMap)
return;
TrackedRendererListHashSet* descendants = percentHeightDescendantsMap->get(this);
if (!descendants)
return;
for (auto it = descendants->begin(), end = descendants->end(); it != end; ++it) {
RenderElement* renderer = *it;
// Let's not dirty the height perecentage descendant when it has an absolutely positioned containing block ancestor. We should be able to dirty such boxes through the regular invalidation logic.
bool descendantNeedsLayout = true;
for (auto* ancestor = renderer->containingBlock(); ancestor && ancestor != this; ancestor = ancestor->containingBlock()) {
if (ancestor->isOutOfFlowPositioned()) {
descendantNeedsLayout = false;
break;
}
}
if (!descendantNeedsLayout)
continue;
while (renderer != this) {
if (renderer->normalChildNeedsLayout())
break;
renderer->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 (renderer->hasIntrinsicAspectRatio() || renderer->style().hasAspectRatio())
renderer->setPreferredLogicalWidthsDirty(true);
renderer = renderer->container();
ASSERT(renderer);
if (!renderer)
break;
}
}
}
void RenderBlock::simplifiedNormalFlowLayout()
{
if (childrenInline()) {
ListHashSet<LegacyRootInlineBox*> lineBoxes;
for (InlineWalker walker(downcast<RenderBlockFlow>(*this)); !walker.atEnd(); walker.advance()) {
RenderObject& renderer = *walker.current();
if (!renderer.isOutOfFlowPositioned() && (renderer.isReplacedOrInlineBlock() || 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))
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) {
LegacyRootInlineBox* 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::canPerformSimplifiedLayout() const
{
return (posChildNeedsLayout() || needsSimplifiedNormalFlowLayout()) && !normalChildNeedsLayout() && !selfNeedsLayout();
}
bool RenderBlock::simplifiedLayout()
{
if (!canPerformSimplifiedLayout())
return false;
LayoutStateMaintainer statePusher(*this, locationOffset(), hasTransform() || hasReflection() || style().isFlippedBlocksWritingMode());
if (needsPositionedMovementLayout() && !tryLayoutDoingPositionedMovementOnly())
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 fragment receiving content.
if (is<RenderFragmentedFlow>(*this))
downcast<RenderFragmentedFlow>(*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);
updateLayerTransform();
updateScrollInfoAfterLayout();
clearNeedsLayout();
return true;
}
void RenderBlock::markFixedPositionObjectForLayoutIfNeeded(RenderBox& positionedChild)
{
if (positionedChild.style().position() != PositionType::Fixed)
return;
bool hasStaticBlockPosition = positionedChild.style().hasStaticBlockPosition(isHorizontalWritingMode());
bool hasStaticInlinePosition = positionedChild.style().hasStaticInlinePosition(isHorizontalWritingMode());
if (!hasStaticBlockPosition && !hasStaticInlinePosition)
return;
auto* parent = positionedChild.parent();
while (parent && !is<RenderView>(*parent) && parent->style().position() != PositionType::Absolute)
parent = parent->parent();
if (!parent || parent->style().position() != PositionType::Absolute)
return;
if (hasStaticInlinePosition) {
LogicalExtentComputedValues computedValues;
positionedChild.computeLogicalWidthInFragment(computedValues);
LayoutUnit newLeft = computedValues.m_position;
if (newLeft != positionedChild.logicalLeft())
positionedChild.setChildNeedsLayout(MarkOnlyThis);
} else if (hasStaticBlockPosition) {
LayoutUnit oldTop = positionedChild.logicalTop();
positionedChild.updateLogicalHeight();
if (positionedChild.logicalTop() != oldTop)
positionedChild.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;
if (marginLeft.isFixed())
margin += marginLeft.value();
if (marginRight.isFixed())
margin += marginRight.value();
return margin;
}
void RenderBlock::layoutPositionedObject(RenderBox& r, bool relayoutChildren, bool fixedPositionObjectsOnly)
{
estimateFragmentRangeForBoxChild(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;
bool needsBlockDirectionLocationSetBeforeLayout = r.needsLayout() && view().frameView().layoutContext().layoutState()->needsBlockDirectionLocationSetBeforeLayout();
if (needsBlockDirectionLocationSetBeforeLayout) {
if (isHorizontalWritingMode() == r.isHorizontalWritingMode())
r.updateLogicalHeight();
else
r.updateLogicalWidth();
oldLogicalTop = logicalTopForChild(r);
}
r.layoutIfNeeded();
auto* parent = r.parent();
bool layoutChanged = false;
if (parent->isFlexibleBox() && downcast<RenderFlexibleBox>(parent)->setStaticPositionForPositionedLayout(r)) {
// The static position of an abspos child of a flexbox depends on its size
// (for example, they can be centered). So we may have to reposition the
// item after layout.
// FIXME: We could probably avoid a layout here and just reposition?
layoutChanged = true;
}
// Lay out again if our estimate was wrong.
if (layoutChanged || (needsBlockDirectionLocationSetBeforeLayout && logicalTopForChild(r) != oldLogicalTop)) {
r.setChildNeedsLayout(MarkOnlyThis);
r.layoutIfNeeded();
}
if (updateFragmentRangeForBoxChild(r)) {
r.setNeedsLayout(MarkOnlyThis);
r.layoutIfNeeded();
}
if (view().frameView().layoutContext().layoutState()->isPaginated() && is<RenderBlockFlow>(*this))
downcast<RenderBlockFlow>(*this).adjustSizeContainmentChildForPagination(r, r.logicalTop());
}
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()
{
auto* layoutState = view().frameView().layoutContext().layoutState();
if (needsLayout() || !layoutState->isPaginated())
return;
if (layoutState->pageLogicalHeightChanged() || (layoutState->pageLogicalHeight() && layoutState->pageLogicalOffset(this, logicalTop()) != pageLogicalOffset()))
setChildNeedsLayout(MarkOnlyThis);
}
void RenderBlock::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutPoint adjustedPaintOffset = paintOffset + location();
PaintPhase phase = paintInfo.phase;
// Check if we need to do anything at all.
// FIXME: Could eliminate the isDocumentElementRenderer() check if we fix background painting so that the RenderView
// paints the root's background.
if (!isDocumentElementRenderer() && !paintInfo.paintBehavior.contains(PaintBehavior::CompositedOverflowScrollContent)) {
LayoutRect overflowBox = visualOverflowRect();
flipForWritingMode(overflowBox);
overflowBox.moveBy(adjustedPaintOffset);
if (!overflowBox.intersects(paintInfo.rect))
return;
}
bool pushedClip = pushContentsClip(paintInfo, adjustedPaintOffset);
paintObject(paintInfo, adjustedPaintOffset);
if (pushedClip)
popContentsClip(paintInfo, phase, adjustedPaintOffset);
// Our scrollbar widgets paint exactly when we tell them to, so that they work properly with
// z-index. We paint after we painted the background/border, so that the scrollbars will
// sit above the background/border.
if ((phase == PaintPhase::BlockBackground || phase == PaintPhase::ChildBlockBackground) && hasNonVisibleOverflow() && layer()
&& layer()->scrollableArea() && style().visibility() == Visibility::Visible && paintInfo.shouldPaintWithinRoot(*this) && !paintInfo.paintRootBackgroundOnly())
layer()->scrollableArea()->paintOverflowControls(paintInfo.context(), roundedIntPoint(adjustedPaintOffset), snappedIntRect(paintInfo.rect));
}
void RenderBlock::paintContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
// Style is non-final if the element has a pending stylesheet before it. We end up with renderers with such styles if a script
// forces renderer construction by querying something layout dependent.
// Avoid FOUC by not painting. Switching to final style triggers repaint.
if (style().isNotFinal())
return;
if (childrenInline())
paintInlineChildren(paintInfo, paintOffset);
else {
PaintPhase newPhase = (paintInfo.phase == PaintPhase::ChildOutlines) ? PaintPhase::Outline : paintInfo.phase;
newPhase = (newPhase == PaintPhase::ChildBlockBackgrounds) ? PaintPhase::ChildBlockBackground : 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);
if (paintInfo.eventRegionContext)
paintInfoForChild.paintBehavior.add(PaintBehavior::EventRegionIncludeBackground);
// 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)
{
if (child.isExcludedAndPlacedInBorder())
return true;
// 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.isReplacedOrInlineBlock() && 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
RenderBlock* caretPainter;
bool isContentEditable;
if (type == CursorCaret) {
caretPainter = frame().selection().caretRendererWithoutUpdatingLayout();
isContentEditable = frame().selection().selection().hasEditableStyle();
} else {
caretPainter = page().dragCaretController().caretRenderer();
isContentEditable = page().dragCaretController().isContentEditable();
}
if (caretPainter == this && (isContentEditable || settings().caretBrowsingEnabled())) {
if (type == CursorCaret)
frame().selection().paintCaret(paintInfo.context(), paintOffset, paintInfo.rect);
else
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 == PaintPhase::BlockBackground || paintPhase == PaintPhase::ChildBlockBackground) && style().visibility() == Visibility::Visible) {
if (hasVisibleBoxDecorations())
paintBoxDecorations(paintInfo, paintOffset);
}
// Paint legends just above the border before we scroll or clip.
if (paintPhase == PaintPhase::BlockBackground || paintPhase == PaintPhase::ChildBlockBackground || paintPhase == PaintPhase::Selection)
paintExcludedChildrenInBorder(paintInfo, paintOffset);
if (paintPhase == PaintPhase::Mask && style().visibility() == Visibility::Visible) {
paintMask(paintInfo, paintOffset);
return;
}
if (paintPhase == PaintPhase::ClippingMask && style().visibility() == Visibility::Visible) {
paintClippingMask(paintInfo, paintOffset);
return;
}
// If just painting the root background, then return.
if (paintInfo.paintRootBackgroundOnly())
return;
if (paintPhase == PaintPhase::EventRegion) {
auto borderRect = LayoutRect(paintOffset, size());
if (paintInfo.paintBehavior.contains(PaintBehavior::EventRegionIncludeBackground) && visibleToHitTesting()) {
auto borderRegion = approximateAsRegion(style().getRoundedBorderFor(borderRect));
LOG_WITH_STREAM(EventRegions, stream << "RenderBlock " << *this << " uniting region " << borderRegion);
paintInfo.eventRegionContext->unite(borderRegion, *this, style(), isTextControl() && downcast<RenderTextControl>(*this).textFormControlElement().isInnerTextElementEditable());
}
if (!paintInfo.paintBehavior.contains(PaintBehavior::EventRegionIncludeForeground))
return;
bool needsTraverseDescendants = hasVisualOverflow() || containsFloats() || !paintInfo.eventRegionContext->contains(enclosingIntRect(borderRect)) || view().needsEventRegionUpdateForNonCompositedFrame();
LOG_WITH_STREAM(EventRegions, stream << "RenderBlock " << *this << " needsTraverseDescendants for event region: hasVisualOverflow: " << hasVisualOverflow() << " containsFloats: "
<< containsFloats() << " border box is outside current region: " << !paintInfo.eventRegionContext->contains(enclosingIntRect(borderRect)) << " needsEventRegionUpdateForNonCompositedFrame:" << view().needsEventRegionUpdateForNonCompositedFrame());
#if ENABLE(TOUCH_ACTION_REGIONS)
needsTraverseDescendants |= document().mayHaveElementsWithNonAutoTouchAction();
LOG_WITH_STREAM(EventRegions, stream << " may have touch-action elements: " << document().mayHaveElementsWithNonAutoTouchAction());
#endif
#if ENABLE(WHEEL_EVENT_REGIONS)
needsTraverseDescendants |= document().hasWheelEventHandlers();
LOG_WITH_STREAM(EventRegions, stream << " has wheel event handlers: " << document().hasWheelEventHandlers());
#endif
#if ENABLE(EDITABLE_REGION)
// We treat the entire text control as editable to match users' expectation even
// though it's actually the inner text element of the control that is editable.
// So, no need to traverse to find the inner text element in this case.
if (!isTextControl()) {
needsTraverseDescendants |= document().mayHaveEditableElements() && page().shouldBuildEditableRegion();
LOG_WITH_STREAM(EventRegions, stream << " needs editable event region: " << (document().mayHaveEditableElements() && page().shouldBuildEditableRegion()));
}
#endif
#if ENABLE(INTERACTION_REGIONS_IN_EVENT_REGION)
needsTraverseDescendants |= page().shouldBuildInteractionRegions();
#endif
if (!needsTraverseDescendants)
return;
}
// Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).
LayoutPoint scrolledOffset = paintOffset;
scrolledOffset.moveBy(-scrollPosition());
// 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 == PaintPhase::BlockBackground || paintPhase == PaintPhase::ChildBlockBackground) && style().visibility() == Visibility::Visible)
paintColumnRules(paintInfo, scrolledOffset);
// Done with backgrounds, borders and column rules.
if (paintPhase == PaintPhase::BlockBackground)
return;
// 2. paint contents
if (paintPhase != PaintPhase::SelfOutline)
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 == PaintPhase::Float || paintPhase == PaintPhase::Selection || paintPhase == PaintPhase::TextClip || paintPhase == PaintPhase::EventRegion)
paintFloats(paintInfo, scrolledOffset, paintPhase == PaintPhase::Selection || paintPhase == PaintPhase::TextClip || paintPhase == PaintPhase::EventRegion);
// 5. paint outline.
if ((paintPhase == PaintPhase::Outline || paintPhase == PaintPhase::SelfOutline) && hasOutline() && style().visibility() == Visibility::Visible)
paintOutline(paintInfo, LayoutRect(paintOffset, size()));
// 6. paint continuation outlines.
if ((paintPhase == PaintPhase::Outline || paintPhase == PaintPhase::ChildOutlines)) {
RenderInline* inlineCont = inlineContinuation();
if (inlineCont && inlineCont->hasOutline() && inlineCont->style().visibility() == 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 (!InlineIterator::firstInlineBoxFor(*inlineRenderer) || (!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 PaintPhase::Foreground,
// then paint the caret.
if (paintPhase == PaintPhase::Foreground) {
paintCaret(paintInfo, paintOffset, CursorCaret);
paintCaret(paintInfo, paintOffset, DragCaret);
}
}
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->isContinuation());
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() != HighlightState::None && style().visibility() == 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() || hasNonVisibleOverflow()
|| isPositioned() || isFloating()
|| isTableCell() || isInlineBlockOrInlineTable()
|| hasTransform() || hasReflection() || hasMask() || isWritingModeRoot()
|| isRenderFragmentedFlow() || style().columnSpan() == ColumnSpan::All)
return true;
if (view().selection().start()) {
Node* startElement = view().selection().start()->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 - toFloatSize(scrollPosition()));
LogicalSelectionOffsetCaches cache(*this);
LayoutUnit lastTop;
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 == PaintPhase::Foreground) {
LogicalSelectionOffsetCaches cache(*this);
LayoutUnit lastTop;
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.moveBy(layer->renderBox()->scrollPosition());
}
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 fragments 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() == ColumnSpan::All || isRenderFragmentedFlow()) {
// FIXME: We should learn how to gap fill multiple columns and transforms eventually.
lastLogicalTop = blockDirectionOffset(rootBlock, offsetFromRootBlock) + logicalHeight();
lastLogicalLeft = logicalLeftSelectionOffset(rootBlock, logicalHeight(), cache);
lastLogicalRight = logicalRightSelectionOffset(rootBlock, logicalHeight(), cache);
return result;
}
if (childrenInline())
result = inlineSelectionGaps(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, lastLogicalTop, lastLogicalLeft, lastLogicalRight, cache, paintInfo);
else
result = blockSelectionGaps(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, lastLogicalTop, lastLogicalLeft, lastLogicalRight, cache, paintInfo);
// Fill the vertical gap all the way to the bottom of our block if the selection extends past our block.
if (&rootBlock == this && (selectionState() != HighlightState::Both && selectionState() != HighlightState::End) && !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() == HighlightState::None; curr = curr->nextSiblingBox()) { }
if (!curr)
return result;
LogicalSelectionOffsetCaches childCache(*this, cache);
for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSiblingBox()) {
HighlightState childState = curr->selectionState();
if (childState == HighlightState::Both || childState == HighlightState::End)
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 != HighlightState::None)) && !isRubyBase() && !isRubyText();
if (fillBlockGaps) {
// We need to fill the vertical gap above this object.
if (childState == HighlightState::End || childState == HighlightState::Inside) {
// 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 == HighlightState::Start || sawSelectionEnd))
childState = HighlightState::None;
// 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 != HighlightState::None && 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, RenderElement* 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, RenderElement* 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(HighlightState state, bool& leftGap, bool& rightGap)
{
bool ltr = style().isLeftToRightDirection();
leftGap = (state == RenderObject::HighlightState::Inside) || (state == RenderObject::HighlightState::End && ltr) || (state == RenderObject::HighlightState::Start && !ltr);
rightGap = (state == RenderObject::HighlightState::Inside) || (state == RenderObject::HighlightState::Start && ltr) || (state == RenderObject::HighlightState::End && !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();
if (!cb)
break;
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();
if (!cb)
break;
currentCache = info.cache();
}
return logicalRight;
}
TrackedRendererListHashSet* RenderBlock::positionedObjects() const
{
return positionedDescendantsMap().positionedRenderers(*this);
}
void RenderBlock::insertPositionedObject(RenderBox& positioned)
{
ASSERT(!isAnonymousBlock());
positioned.clearOverridingContainingBlockContentSize();
if (positioned.isRenderFragmentedFlow())
return;
// FIXME: Find out if we can do this as part of positioned.setChildNeedsLayout(MarkOnlyThis)
if (positioned.needsLayout()) {
// We should turn this bit on only while in layout.
ASSERT(posChildNeedsLayout() || view().frameView().layoutContext().isInLayout());
setPosChildNeedsLayoutBit(true);
}
positionedDescendantsMap().addDescendant(*this, positioned);
}
void RenderBlock::removePositionedObject(const RenderBox& rendererToRemove)
{
positionedDescendantsMap().removeDescendant(rendererToRemove);
}
void RenderBlock::removePositionedObjects(const RenderBlock* newContainingBlockCandidate, ContainingBlockState containingBlockState)
{
auto* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
Vector<RenderBox*, 16> renderersToRemove;
for (auto* renderer : *positionedDescendants) {
if (newContainingBlockCandidate && !renderer->isDescendantOf(newContainingBlockCandidate))
continue;
renderersToRemove.append(renderer);
if (containingBlockState == NewContainingBlock)
renderer->setChildNeedsLayout(MarkOnlyThis);
// It is the parent block's job to add positioned children to positioned objects list of its containing block.
// Dirty the parent to ensure this happens. We also need to make sure the new containing block is dirty as well so
// that it gets to these new positioned objects.
auto* parent = renderer->parent();
while (parent && !is<RenderBlock>(parent))
parent = parent->parent();
if (parent)
parent->setChildNeedsLayout();
if (renderer->isFixedPositioned())
view().setNeedsLayout();
else if (auto* newContainingBlock = containingBlock()) {
// During style change, at this point the renderer's containing block is still "this" renderer, and "this" renderer is still positioned.
// FIXME: During subtree moving, this is mostly invalid but either the subtree is detached (we don't even get here) or renderers
// are already marked dirty.
for (; newContainingBlock && !newContainingBlock->canContainAbsolutelyPositionedObjects(); newContainingBlock = newContainingBlock->containingBlock()) { }
if (newContainingBlock)
newContainingBlock->setNeedsLayout();
}
}
for (auto* renderer : renderersToRemove)
removePositionedObject(*renderer);
}
void RenderBlock::addPercentHeightDescendant(RenderBox& descendant)
{
insertIntoTrackedRendererMaps(*this, descendant);
}
void RenderBlock::removePercentHeightDescendant(RenderBox& descendant)
{
removeFromTrackedRendererMaps(descendant);
}
TrackedRendererListHashSet* RenderBlock::percentHeightDescendants() const
{
return percentHeightDescendantsMap ? percentHeightDescendantsMap->get(this) : nullptr;
}
bool RenderBlock::hasPercentHeightContainerMap()
{
return percentHeightContainerMap;
}
bool RenderBlock::hasPercentHeightDescendant(RenderBox& descendant)
{
// We don't null check percentHeightContainerMap since the caller
// already ensures this and we need to call this function on every
// descendant in clearPercentHeightDescendantsFrom().
ASSERT(percentHeightContainerMap);
return percentHeightContainerMap->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(percentHeightContainerMap);
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);
}
}
bool RenderBlock::isContainingBlockAncestorFor(RenderObject& renderer) const
{
for (const auto* ancestor = renderer.containingBlock(); ancestor; ancestor = ancestor->containingBlock()) {
if (ancestor == this)
return true;
}
return false;
}
LayoutUnit RenderBlock::textIndentOffset() const
{
LayoutUnit cw;
if (style().textIndent().isPercentOrCalculated())
cw = availableLogicalWidth();
return minimumValueForLength(style().textIndent(), cw);
}
LayoutUnit RenderBlock::logicalLeftOffsetForContent(RenderFragmentContainer* fragment) const
{
LayoutUnit logicalLeftOffset = style().isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop();
if (shouldPlaceVerticalScrollbarOnLeft() && isHorizontalWritingMode())
logicalLeftOffset += verticalScrollbarWidth();
if (!fragment)
return logicalLeftOffset;
LayoutRect boxRect = borderBoxRectInFragment(fragment);
return logicalLeftOffset + (isHorizontalWritingMode() ? boxRect.x() : boxRect.y());
}
LayoutUnit RenderBlock::logicalRightOffsetForContent(RenderFragmentContainer* fragment) const
{
LayoutUnit logicalRightOffset = style().isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop();
if (shouldPlaceVerticalScrollbarOnLeft() && isHorizontalWritingMode())
logicalRightOffset += verticalScrollbarWidth();
logicalRightOffset += availableLogicalWidth();
if (!fragment)
return logicalRightOffset;
LayoutRect boxRect = borderBoxRectInFragment(fragment);
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() == LineAlign::None)
return left;
// Push in our left offset so that it is aligned with the character grid.
auto* layoutState = view().frameView().layoutContext().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 fragments (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() == LineAlign::None)
return right;
// Push in our right offset so that it is aligned with the character grid.
auto* layoutState = view().frameView().layoutContext().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 fragments (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::isPointInOverflowControl(HitTestResult& result, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset)
{
if (!scrollsOverflow())
return false;
if (auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr)
return scrollableArea->hitTestOverflowControls(result, roundedIntPoint(locationInContainer - toLayoutSize(accumulatedOffset)));
return false;
}
Node* RenderBlock::nodeForHitTest() const
{
// If we are in the margins of block elements that are part of a
// continuation we're actually still inside the enclosing element
// that was split. Use the appropriate inner node.
return continuation() ? continuation()->element() : element();
}
bool RenderBlock::hitTestChildren(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& adjustedLocation, HitTestAction hitTestAction)
{
// Hit test descendants first.
const LayoutSize localOffset = toLayoutSize(adjustedLocation);
const LayoutSize scrolledOffset(localOffset - toLayoutSize(scrollPosition()));
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;
}
return false;
}
bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
const LayoutPoint adjustedLocation(accumulatedOffset + location());
const LayoutSize localOffset = toLayoutSize(adjustedLocation);
// Check if we need to do anything at all.
if (!hitTestVisualOverflow(locationInContainer, accumulatedOffset))
return false;
if ((hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground)
&& visibleToHitTesting(request) && isPointInOverflowControl(result, locationInContainer.point(), adjustedLocation)) {
updateHitTestResult(result, locationInContainer.point() - localOffset);
// FIXME: isPointInOverflowControl() doesn't handle rect-based tests yet.
if (result.addNodeToListBasedTestResult(nodeForHitTest(), request, locationInContainer) == HitTestProgress::Stop)
return true;
}
if (!hitTestClipPath(locationInContainer, accumulatedOffset))
return false;
// If we have clipping, then we can't have any spillout.
bool useClip = (hasControlClip() || hasNonVisibleOverflow());
bool checkChildren = !useClip || (hasControlClip() ? locationInContainer.intersects(controlClipRect(adjustedLocation)) : locationInContainer.intersects(overflowClipRect(adjustedLocation, nullptr, IncludeOverlayScrollbarSize)));
if (checkChildren && hitTestChildren(request, result, locationInContainer, adjustedLocation, hitTestAction))
return true;
if (!checkChildren && hitTestExcludedChildrenInBorder(request, result, locationInContainer, adjustedLocation, hitTestAction))
return true;
if (!hitTestBorderRadius(locationInContainer, accumulatedOffset))
return false;
// Now hit test our background
if (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) {
LayoutRect boundsRect(adjustedLocation, size());
if (visibleToHitTesting(request) && locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - localOffset));
if (result.addNodeToListBasedTestResult(nodeForHitTest(), request, locationInContainer, boundsRect) == HitTestProgress::Stop)
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(), Affinity::Downstream);
return ancestor->createVisiblePosition(childElement->computeNodeIndex() + 1, Affinity::Upstream);
}
VisiblePosition RenderBlock::positionForPointWithInlineChildren(const LayoutPoint&, const RenderFragmentContainer*)
{
ASSERT_NOT_REACHED();
return VisiblePosition();
}
static inline bool isChildHitTestCandidate(const RenderBox& box)
{
return box.height() && box.style().visibility() == Visibility::Visible && !box.isOutOfFlowPositioned() && !box.isRenderFragmentedFlow();
}
// Valid candidates in a FragmentedFlow must be rendered by the fragment.
static inline bool isChildHitTestCandidate(const RenderBox& box, const RenderFragmentContainer* fragment, const LayoutPoint& point)
{
if (!isChildHitTestCandidate(box))
return false;
if (!fragment)
return true;
const RenderBlock& block = is<RenderBlock>(box) ? downcast<RenderBlock>(box) : *box.containingBlock();
return block.fragmentAtBlockOffset(point.y()) == fragment;
}
VisiblePosition RenderBlock::positionForPoint(const LayoutPoint& point, const RenderFragmentContainer* fragment)
{
if (isTable())
return RenderBox::positionForPoint(point, fragment);
if (isReplacedOrInlineBlock()) {
// 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(), Affinity::Downstream);
if (pointLogicalTop >= logicalHeight() || (pointLogicalTop >= 0 && pointLogicalLeft >= logicalWidth()))
return createVisiblePosition(caretMaxOffset(), Affinity::Downstream);
}
if (isFlexibleBoxIncludingDeprecated() || isRenderGrid())
return RenderBox::positionForPoint(point, fragment);
LayoutPoint pointInContents = point;
offsetForContents(pointInContents);
LayoutPoint pointInLogicalContents(pointInContents);
if (!isHorizontalWritingMode())
pointInLogicalContents = pointInLogicalContents.transposedPoint();
if (childrenInline())
return positionForPointWithInlineChildren(pointInLogicalContents, fragment);
RenderBox* lastCandidateBox = lastChildBox();
if (!fragment)
fragment = fragmentAtBlockOffset(pointInLogicalContents.y());
while (lastCandidateBox && !isChildHitTestCandidate(*lastCandidateBox, fragment, 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, fragment, pointInLogicalContents))
continue;
auto childLogicalBottom = logicalTopForChild(*childBox) + logicalHeightForChild(*childBox);
if (is<RenderBlockFlow>(childBox))
childLogicalBottom = std::max(childLogicalBottom, downcast<RenderBlockFlow>(*childBox).lowestFloatLogicalBottom());
// We hit child if our click is above the bottom of its padding box (like IE6/7 and FF3).
if (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, fragment);
}
void RenderBlock::offsetForContents(LayoutPoint& offset) const
{
offset = flipForWritingMode(offset);
offset += toLayoutSize(scrollPosition());
offset = flipForWritingMode(offset);
}
void RenderBlock::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
ASSERT(!childrenInline());
auto shouldIgnoreDescendantContentForLogicalWidth = shouldApplySizeOrStyleContainment({ Containment::Size, Containment::InlineSize });
if (!shouldIgnoreDescendantContentForLogicalWidth)
computeBlockPreferredLogicalWidths(minLogicalWidth, maxLogicalWidth);
maxLogicalWidth = std::max(minLogicalWidth, maxLogicalWidth);
int scrollbarWidth = intrinsicScrollbarLogicalWidth();
maxLogicalWidth += scrollbarWidth;
minLogicalWidth += scrollbarWidth;
}
void RenderBlock::computePreferredLogicalWidths()
{
ASSERT(preferredLogicalWidthsDirty());
m_minPreferredLogicalWidth = 0;
m_maxPreferredLogicalWidth = 0;
const RenderStyle& styleToUse = style();
const auto& lengthToUse = hasOverridingLogicalWidthLength() ? overridingLogicalWidthLength() : styleToUse.logicalWidth();
if (!isTableCell() && lengthToUse.isFixed() && lengthToUse.value() >= 0
&& !(isDeprecatedFlexItem() && !lengthToUse.intValue()))
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(lengthToUse);
else if (shouldComputeLogicalWidthFromAspectRatio())
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = computeLogicalWidthFromAspectRatio();
else
computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
RenderBox::computePreferredLogicalWidths(styleToUse.logicalMinWidth(), styleToUse.logicalMaxWidth(), borderAndPaddingLogicalWidth());
setPreferredLogicalWidthsDirty(false);
}
void RenderBlock::computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
ASSERT(!shouldApplyInlineSizeContainment());
const RenderStyle& styleToUse = style();
bool nowrap = styleToUse.whiteSpace() == WhiteSpace::NoWrap;
RenderObject* child = firstChild();
RenderBlock* containingBlock = this->containingBlock();
LayoutUnit floatLeftWidth, floatRightWidth;
LayoutUnit childMinWidth;
LayoutUnit childMaxWidth;
bool hadExcludedChildren = computePreferredWidthsForExcludedChildren(childMinWidth, childMaxWidth);
if (hadExcludedChildren) {
minLogicalWidth = std::max(childMinWidth, minLogicalWidth);
maxLogicalWidth = std::max(childMaxWidth, maxLogicalWidth);
}
while (child) {
// Positioned children don't affect the min/max width. Legends in fieldsets are skipped here
// since they compute outside of any one layout system. Other children excluded from
// normal layout are only used with block flows, so it's ok to calculate them here.
if (child->isOutOfFlowPositioned() || child->isExcludedAndPlacedInBorder()) {
child = child->nextSibling();
continue;
}
const RenderStyle& childStyle = child->style();
if (child->isFloating() || (is<RenderBox>(*child) && downcast<RenderBox>(*child).avoidsFloats())) {
LayoutUnit floatTotalWidth = floatLeftWidth + floatRightWidth;
auto childUsedClear = RenderStyle::usedClear(*child);
if (childUsedClear == UsedClear::Left || childUsedClear == UsedClear::Both) {
maxLogicalWidth = std::max(floatTotalWidth, maxLogicalWidth);
floatLeftWidth = 0;
}
if (childUsedClear == UsedClear::Right || childUsedClear == UsedClear::Both) {
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;
LayoutUnit marginStart;
LayoutUnit marginEnd;
if (startMarginLength.isFixed())
marginStart += startMarginLength.value();
if (endMarginLength.isFixed())
marginEnd += endMarginLength.value();
margin = marginStart + marginEnd;
LayoutUnit childMinPreferredLogicalWidth, childMaxPreferredLogicalWidth;
computeChildPreferredLogicalWidths(*child, childMinPreferredLogicalWidth, childMaxPreferredLogicalWidth);
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 (RenderStyle::usedFloat(*child) == UsedFloat::Left)
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);
}
void RenderBlock::computeChildIntrinsicLogicalWidths(RenderObject& child, LayoutUnit& minPreferredLogicalWidth, LayoutUnit& maxPreferredLogicalWidth) const
{
minPreferredLogicalWidth = child.minPreferredLogicalWidth();
maxPreferredLogicalWidth = child.maxPreferredLogicalWidth();
}
void RenderBlock::computeChildPreferredLogicalWidths(RenderObject& child, LayoutUnit& minPreferredLogicalWidth, LayoutUnit& maxPreferredLogicalWidth) const
{
if (child.isBox() && child.isHorizontalWritingMode() != isHorizontalWritingMode()) {
// If the child is an orthogonal flow, child's height determines the width,
// but the height is not available until layout.
// http://dev.w3.org/csswg/css-writing-modes-3/#orthogonal-shrink-to-fit
if (!child.needsLayout()) {
minPreferredLogicalWidth = maxPreferredLogicalWidth = downcast<RenderBox>(child).logicalHeight();
return;
}
auto& box = downcast<RenderBox>(child);
if (box.shouldComputeLogicalHeightFromAspectRatio() && box.style().logicalWidth().isFixed()) {
LayoutUnit logicalWidth = LayoutUnit(box.style().logicalWidth().value());
minPreferredLogicalWidth = maxPreferredLogicalWidth = blockSizeFromAspectRatio(box.horizontalBorderAndPaddingExtent(), box.verticalBorderAndPaddingExtent(), LayoutUnit(box.style().logicalAspectRatio()), box.style().boxSizingForAspectRatio(), logicalWidth);
return;
}
minPreferredLogicalWidth = maxPreferredLogicalWidth = box.computeLogicalHeightWithoutLayout();
return;
}
computeChildIntrinsicLogicalWidths(child, minPreferredLogicalWidth, maxPreferredLogicalWidth);
// For non-replaced blocks if the inline size is min|max-content or a definite
// size the min|max-content contribution is that size plus border, padding and
// margin https://drafts.csswg.org/css-sizing/#block-intrinsic
if (child.isRenderBlock()) {
const Length& computedInlineSize = child.style().logicalWidth();
if (computedInlineSize.isMaxContent())
minPreferredLogicalWidth = maxPreferredLogicalWidth;
else if (computedInlineSize.isMinContent())
maxPreferredLogicalWidth = minPreferredLogicalWidth;
}
}
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
{
// 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 (isReplacedOrInlineBlock() && linePositionMode == PositionOnContainingLine)
return RenderBox::lineHeight(firstLine, direction, linePositionMode);
auto& lineStyle = firstLine ? firstLineStyle() : style();
return lineStyle.computedLineHeight();
}
LayoutUnit 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 (isReplacedOrInlineBlock() && linePositionMode == PositionOnContainingLine) {
// For "leaf" theme objects, let the theme decide what the baseline position is.
// FIXME: Might be better to have a custom CSS property instead, so that if the theme
// is turned off, checkboxes/radios will still have decent baselines.
// FIXME: Need to patch form controls to deal with vertical lines.
if (style().hasEffectiveAppearance() && !theme().isControlContainer(style().effectiveAppearance()))
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).
auto ignoreBaseline = [this, direction]() -> bool {
if (isWritingModeRoot() && !isRubyRun())
return true;
auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr;
if (!scrollableArea)
return false;
if (scrollableArea->marquee())
return true;
if (direction == HorizontalLine)
return scrollableArea->verticalScrollbar() || scrollableArea->scrollOffset().y();
return scrollableArea->horizontalScrollbar() || scrollableArea->scrollOffset().x();
};
auto baselinePos = ignoreBaseline() ? std::optional<LayoutUnit>() : 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 = std::optional<LayoutUnit>();
}
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.metricsOfPrimaryFont();
return LayoutUnit { fontMetrics.ascent(baselineType) + (lineHeight(firstLine, direction, linePositionMode) - fontMetrics.height()) / 2 }.toInt();
}
LayoutUnit RenderBlock::minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const
{
if (!document().inNoQuirksMode() && replacedHeight)
return replacedHeight;
const RenderStyle& style = isFirstLine ? firstLineStyle() : this->style();
if (!(style.lineBoxContain().contains(LineBoxContain::Block)))
return 0;
return std::max<LayoutUnit>(replacedHeight, lineHeight(isFirstLine, isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes));
}
std::optional<LayoutUnit> RenderBlock::firstLineBaseline() const
{
if (shouldApplyLayoutContainment())
return std::nullopt;
if (isWritingModeRoot() && !isRubyRun())
return std::optional<LayoutUnit>();
for (RenderBox* curr = firstChildBox(); curr; curr = curr->nextSiblingBox()) {
if (!curr->isFloatingOrOutOfFlowPositioned()) {
if (auto result = curr->firstLineBaseline())
return LayoutUnit { curr->logicalTop() + result.value() }; // Translate to our coordinate space.
}
}
return std::optional<LayoutUnit>();
}
std::optional<LayoutUnit> RenderBlock::inlineBlockBaseline(LineDirectionMode lineDirection) const
{
if (shouldApplyLayoutContainment())
return synthesizedBaselineFromBorderBox(*this, lineDirection) + (lineDirection == HorizontalLine ? marginBottom() : marginLeft());
if (isWritingModeRoot() && !isRubyRun())
return std::optional<LayoutUnit>();
bool haveNormalFlowChild = false;
for (auto* box = lastChildBox(); box; box = box->previousSiblingBox()) {
if (box->isFloatingOrOutOfFlowPositioned())
continue;
haveNormalFlowChild = true;
if (auto result = box->inlineBlockBaseline(lineDirection))
return LayoutUnit { (box->logicalTop() + result.value()).toInt() }; // Translate to our coordinate space.
}
if (!haveNormalFlowChild && hasLineIfEmpty()) {
auto& fontMetrics = firstLineStyle().metricsOfPrimaryFont();
return LayoutUnit { LayoutUnit(fontMetrics.ascent()
+ (lineHeight(true, lineDirection, PositionOfInteriorLineBoxes) - fontMetrics.height()) / 2
+ (lineDirection == HorizontalLine ? borderTop() + paddingTop() : borderRight() + paddingRight())).toInt() };
}
return std::optional<LayoutUnit>();
}
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();
}
static inline RenderBlock* findFirstLetterBlock(RenderBlock* start)
{
RenderBlock* firstLetterBlock = start;
while (true) {
bool canHaveFirstLetterRenderer = firstLetterBlock->style().hasPseudoStyle(PseudoId::FirstLetter)
&& firstLetterBlock->canHaveGeneratedChildren()
&& isRenderBlockFlowOrRenderButton(*firstLetterBlock);
if (canHaveFirstLetterRenderer)
return firstLetterBlock;
RenderElement* parentBlock = firstLetterBlock->parent();
if (firstLetterBlock->isReplacedOrInlineBlock() || !parentBlock || parentBlock->firstChild() != firstLetterBlock
|| !isRenderBlockFlowOrRenderButton(*parentBlock))
return nullptr;
firstLetterBlock = downcast<RenderBlock>(parentBlock);
}
return nullptr;
}
void RenderBlock::getFirstLetter(RenderObject*& firstLetter, RenderElement*& firstLetterContainer, RenderObject* skipObject)
{
firstLetter = nullptr;
firstLetterContainer = nullptr;
// Don't recur
if (style().styleType() == PseudoId::FirstLetter)
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() == PseudoId::FirstLetter) {
firstLetter = current.firstChild();
break;
}
firstLetter = current.nextSibling();
} else if (current.isReplacedOrInlineBlock() || is<RenderButton>(current) || is<RenderMenuList>(current))
break;
else if (current.isFlexibleBoxIncludingDeprecated() || current.isRenderGrid())
firstLetter = current.nextSibling();
else if (current.style().hasPseudoStyle(PseudoId::FirstLetter) && 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;
}
RenderFragmentedFlow* RenderBlock::cachedEnclosingFragmentedFlow() const
{
RenderBlockRareData* rareData = getBlockRareData(*this);
if (!rareData || !rareData->m_enclosingFragmentedFlow)
return nullptr;
return rareData->m_enclosingFragmentedFlow.value().get();
}
bool RenderBlock::cachedEnclosingFragmentedFlowNeedsUpdate() const
{
RenderBlockRareData* rareData = getBlockRareData(*this);
if (!rareData || !rareData->m_enclosingFragmentedFlow)
return true;
return false;
}
void RenderBlock::setCachedEnclosingFragmentedFlowNeedsUpdate()
{
RenderBlockRareData& rareData = ensureBlockRareData(*this);
rareData.m_enclosingFragmentedFlow = std::nullopt;
}
RenderFragmentedFlow* RenderBlock::updateCachedEnclosingFragmentedFlow(RenderFragmentedFlow* fragmentedFlow) const
{
RenderBlockRareData& rareData = ensureBlockRareData(*this);
rareData.m_enclosingFragmentedFlow = fragmentedFlow;
return fragmentedFlow;
}
RenderFragmentedFlow* RenderBlock::locateEnclosingFragmentedFlow() const
{
RenderBlockRareData* rareData = getBlockRareData(*this);
if (!rareData || !rareData->m_enclosingFragmentedFlow)
return updateCachedEnclosingFragmentedFlow(RenderBox::locateEnclosingFragmentedFlow());
ASSERT(rareData->m_enclosingFragmentedFlow.value() == RenderBox::locateEnclosingFragmentedFlow());
return rareData->m_enclosingFragmentedFlow.value().get();
}
void RenderBlock::resetEnclosingFragmentedFlowAndChildInfoIncludingDescendants(RenderFragmentedFlow* fragmentedFlow)
{
if (fragmentedFlowState() == NotInsideFragmentedFlow)
return;
if (auto* cachedFragmentedFlow = cachedEnclosingFragmentedFlow())
fragmentedFlow = cachedFragmentedFlow;
setCachedEnclosingFragmentedFlowNeedsUpdate();
RenderElement::resetEnclosingFragmentedFlowAndChildInfoIncludingDescendants(fragmentedFlow);
}
LayoutUnit RenderBlock::paginationStrut() const
{
RenderBlockRareData* rareData = getBlockRareData(*this);
return rareData ? rareData->m_paginationStrut : 0_lu;
}
LayoutUnit RenderBlock::pageLogicalOffset() const
{
RenderBlockRareData* rareData = getBlockRareData(*this);
return rareData ? rareData->m_pageLogicalOffset : 0_lu;
}
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 (auto* continuation = this->continuation()) {
// 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() + inlineContinuation()->containingBlock()->location()));
} else
rects.append(snappedIntRect(accumulatedOffset, size()));
}
void RenderBlock::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
if (!continuation()) {
absoluteQuadsIgnoringContinuation({ { }, size() }, quads, wasFixed);
return;
}
// 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).
auto logicalRect = FloatRect { 0, -collapsedMarginBefore(), width(), height() + collapsedMarginBefore() + collapsedMarginAfter() };
absoluteQuadsIgnoringContinuation(logicalRect, quads, wasFixed);
collectAbsoluteQuadsForContinuation(quads, wasFixed);
}
void RenderBlock::absoluteQuadsIgnoringContinuation(const FloatRect& logicalRect, Vector<FloatQuad>& quads, bool* wasFixed) const
{
// FIXME: This is wrong for block-flows that are horizontal.
// https://bugs.webkit.org/show_bug.cgi?id=46781
auto* fragmentedFlow = enclosingFragmentedFlow();
if (!fragmentedFlow || !fragmentedFlow->absoluteQuadsForBox(quads, wasFixed, this))
quads.append(localToAbsoluteQuad(logicalRect, UseTransforms, wasFixed));
}
LayoutRect RenderBlock::rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const
{
LayoutRect r(RenderBox::rectWithOutlineForRepaint(repaintContainer, outlineWidth));
if (isContinuation())
r.inflateY(collapsedMarginBefore()); // FIXME: This is wrong for block-flows that are horizontal.
return r;
}
const RenderStyle& RenderBlock::outlineStyleForRepaint() const
{
if (auto* continuation = this->continuation())
return continuation->style();
return RenderElement::outlineStyleForRepaint();
}
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);
}
}
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).
auto* inlineContinuation = this->inlineContinuation();
if (inlineContinuation) {
// FIXME: This check really isn't accurate.
bool nextInlineHasLineBox = inlineContinuation->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>(*inlineContinuation->element()->renderer()).firstLineBox();
auto topMargin = prevInlineHasLineBox ? collapsedMarginBefore() : 0_lu;
auto bottomMargin = nextInlineHasLineBox ? collapsedMarginAfter() : 0_lu;
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 (!hasNonVisibleOverflow() && !hasControlClip()) {
if (childrenInline())
addFocusRingRectsForInlineChildren(rects, additionalOffset, paintContainer);
for (auto& box : childrenOfType<RenderBox>(*this)) {
if (is<RenderListMarker>(box))
continue;
FloatPoint pos;
// FIXME: This doesn't work correctly with transforms.
if (box.layer())
pos = box.localToContainerPoint(FloatPoint(), paintContainer);
else
pos = FloatPoint(additionalOffset.x() + box.x(), additionalOffset.y() + box.y());
box.addFocusRingRects(rects, flooredLayoutPoint(pos), paintContainer);
}
}
if (inlineContinuation)
inlineContinuation->addFocusRingRects(rects, flooredLayoutPoint(LayoutPoint(additionalOffset + inlineContinuation->containingBlock()->location() - location())), paintContainer);
}
RenderPtr<RenderBlock> RenderBlock::createAnonymousBlockWithStyleAndDisplay(Document& document, const RenderStyle& style, DisplayType display)
{
// FIXME: Do we need to convert all our inline displays to block-type in the anonymous logic ?
RenderPtr<RenderBlock> newBox;
if (display == DisplayType::Flex || display == DisplayType::InlineFlex)
newBox = createRenderer<RenderFlexibleBox>(document, RenderStyle::createAnonymousStyleWithDisplay(style, DisplayType::Flex));
else
newBox = createRenderer<RenderBlockFlow>(document, RenderStyle::createAnonymousStyleWithDisplay(style, DisplayType::Block));
newBox->initializeStyle();
return newBox;
}
LayoutUnit RenderBlock::offsetFromLogicalTopOfFirstPage() const
{
auto* layoutState = view().frameView().layoutContext().layoutState();
if (layoutState && !layoutState->isPaginated())
return 0;
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (fragmentedFlow)
return fragmentedFlow->offsetFromLogicalTopOfFirstFragment(this);
if (layoutState) {
ASSERT(layoutState->renderer() == this);
LayoutSize offsetDelta = layoutState->layoutOffset() - layoutState->pageOffset();
return isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.width();
}
ASSERT_NOT_REACHED();
return 0;
}
RenderFragmentContainer* RenderBlock::fragmentAtBlockOffset(LayoutUnit blockOffset) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (!fragmentedFlow || !fragmentedFlow->hasValidFragmentInfo())
return 0;
return fragmentedFlow->fragmentAtBlockOffset(this, offsetFromLogicalTopOfFirstPage() + blockOffset, true);
}
static bool canComputeFragmentRangeForBox(const RenderBlock& parentBlock, const RenderBox& childBox, const RenderFragmentedFlow* enclosingFragmentedFlow)
{
if (!enclosingFragmentedFlow)
return false;
if (!enclosingFragmentedFlow->hasFragments())
return false;
if (!childBox.canHaveOutsideFragmentRange())
return false;
return enclosingFragmentedFlow->hasCachedFragmentRangeForBox(parentBlock);
}
bool RenderBlock::childBoxIsUnsplittableForFragmentation(const RenderBox& child) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
bool checkColumnBreaks = fragmentedFlow && fragmentedFlow->shouldCheckColumnBreaks();
bool checkPageBreaks = !checkColumnBreaks && view().frameView().layoutContext().layoutState()->pageLogicalHeight();
return child.isUnsplittableForPagination() || child.style().breakInside() == BreakInside::Avoid
|| (checkColumnBreaks && child.style().breakInside() == BreakInside::AvoidColumn)
|| (checkPageBreaks && child.style().breakInside() == BreakInside::AvoidPage);
}
void RenderBlock::computeFragmentRangeForBoxChild(const RenderBox& box) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
ASSERT(canComputeFragmentRangeForBox(*this, box, fragmentedFlow));
RenderFragmentContainer* startFragment;
RenderFragmentContainer* endFragment;
LayoutUnit offsetFromLogicalTopOfFirstFragment = box.offsetFromLogicalTopOfFirstPage();
if (childBoxIsUnsplittableForFragmentation(box))
startFragment = endFragment = fragmentedFlow->fragmentAtBlockOffset(this, offsetFromLogicalTopOfFirstFragment, true);
else {
startFragment = fragmentedFlow->fragmentAtBlockOffset(this, offsetFromLogicalTopOfFirstFragment, true);
endFragment = fragmentedFlow->fragmentAtBlockOffset(this, offsetFromLogicalTopOfFirstFragment + logicalHeightForChild(box), true);
}
fragmentedFlow->setFragmentRangeForBox(box, startFragment, endFragment);
}
void RenderBlock::estimateFragmentRangeForBoxChild(const RenderBox& box) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (!canComputeFragmentRangeForBox(*this, box, fragmentedFlow))
return;
if (childBoxIsUnsplittableForFragmentation(box)) {
computeFragmentRangeForBoxChild(box);
return;
}
auto estimatedValues = box.computeLogicalHeight(RenderFragmentedFlow::maxLogicalHeight(), logicalTopForChild(box));
LayoutUnit offsetFromLogicalTopOfFirstFragment = box.offsetFromLogicalTopOfFirstPage();
RenderFragmentContainer* startFragment = fragmentedFlow->fragmentAtBlockOffset(this, offsetFromLogicalTopOfFirstFragment, true);
RenderFragmentContainer* endFragment = fragmentedFlow->fragmentAtBlockOffset(this, offsetFromLogicalTopOfFirstFragment + estimatedValues.m_extent, true);
fragmentedFlow->setFragmentRangeForBox(box, startFragment, endFragment);
}
bool RenderBlock::updateFragmentRangeForBoxChild(const RenderBox& box) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (!canComputeFragmentRangeForBox(*this, box, fragmentedFlow))
return false;
RenderFragmentContainer* startFragment = nullptr;
RenderFragmentContainer* endFragment = nullptr;
fragmentedFlow->getFragmentRangeForBox(&box, startFragment, endFragment);
computeFragmentRangeForBoxChild(box);
RenderFragmentContainer* newStartFragment = nullptr;
RenderFragmentContainer* newEndFragment = nullptr;
fragmentedFlow->getFragmentRangeForBox(&box, newStartFragment, newEndFragment);
// Changing the start fragment means we shift everything and a relayout is needed.
if (newStartFragment != startFragment)
return true;
// The fragment range of the box has changed. Some boxes (e.g floats) may have been positioned assuming
// a different range.
if (box.needsLayoutAfterFragmentRangeChange() && newEndFragment != endFragment)
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;
}
ASCIILiteral RenderBlock::renderName() const
{
if (isBody())
return "RenderBody"_s; // FIXME: Temporary hack until we know that the regression tests pass.
if (isFieldset())
return "RenderFieldSet"_s; // FIXME: Remove eventually, but done to keep tests from breaking.
if (isFloating())
return "RenderBlock (floating)"_s;
if (isOutOfFlowPositioned())
return "RenderBlock (positioned)"_s;
if (isAnonymousBlock())
return "RenderBlock (anonymous)"_s;
// FIXME: Temporary hack while the new generated content system is being implemented.
if (isPseudoElement())
return "RenderBlock (generated)"_s;
if (isAnonymous())
return "RenderBlock (generated)"_s;
if (isRelativelyPositioned())
return "RenderBlock (relative positioned)"_s;
if (isStickilyPositioned())
return "RenderBlock (sticky positioned)"_s;
return "RenderBlock"_s;
}
TextRun RenderBlock::constructTextRun(StringView stringView, const RenderStyle& style, ExpansionBehavior expansion, TextRunFlags flags)
{
auto textDirection = TextDirection::LTR;
bool directionalOverride = style.rtlOrdering() == Order::Visual;
if (flags != DefaultTextRunFlags) {
if (flags & RespectDirection)
textDirection = style.direction();
if (flags & RespectDirectionOverride)
directionalOverride |= isOverride(style.unicodeBidi());
}
// This works because:
// 1. TextRun owns its text string. Its member is a String, not a StringView
// 2. This replacement doesn't affect string indices. We're replacing a single Unicode code unit with another Unicode code unit.
// How convenient.
auto updatedString = RenderBlock::updateSecurityDiscCharacters(style, stringView.toStringWithoutCopying());
return TextRun(WTFMove(updatedString), 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 AtomString& atomString, const RenderStyle& style, ExpansionBehavior expansion, TextRunFlags flags)
{
return constructTextRun(StringView(atomString), 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.text().length());
return constructTextRun(text.stringView(offset, stop), style, expansion);
}
TextRun RenderBlock::constructTextRun(const LChar* characters, unsigned length, const RenderStyle& style, ExpansionBehavior expansion)
{
return constructTextRun(StringView(characters, length), style, expansion);
}
TextRun RenderBlock::constructTextRun(const UChar* characters, unsigned length, const RenderStyle& style, ExpansionBehavior expansion)
{
return constructTextRun(StringView(characters, length), style, expansion);
}
#if ASSERT_ENABLED
void RenderBlock::checkPositionedObjectsNeedLayout()
{
auto* positionedDescendants = positionedObjects();
if (!positionedDescendants)
return;
for (auto* renderer : *positionedDescendants)
ASSERT(!renderer->needsLayout());
}
#endif // ASSERT_ENABLED
bool RenderBlock::hasDefiniteLogicalHeight() const
{
return (bool)availableLogicalHeightForPercentageComputation();
}
std::optional<LayoutUnit> RenderBlock::availableLogicalHeightForPercentageComputation() const
{
std::optional<LayoutUnit> availableHeight;
// For anonymous blocks that are skipped during percentage height calculation,
// we consider them to have an indefinite height.
if (skipContainingBlockForPercentHeightCalculation(*this, false))
return availableHeight;
const auto& styleToUse = style();
// A positioned element that specified both top/bottom or that specifies
// height should be treated as though it has a height explicitly specified
// that can be used for any percentage computations.
bool isOutOfFlowPositionedWithSpecifiedHeight = isOutOfFlowPositioned() && (!styleToUse.logicalHeight().isAuto() || (!styleToUse.logicalTop().isAuto() && !styleToUse.logicalBottom().isAuto()));
if (isFlexItem() && downcast<RenderFlexibleBox>(parent())->useChildOverridingLogicalHeightForPercentageResolution(*this))
availableHeight = overridingContentLogicalHeight();
else if (isGridItem() && hasOverridingLogicalHeight())
availableHeight = overridingContentLogicalHeight();
else if (styleToUse.logicalHeight().isFixed()) {
LayoutUnit contentBoxHeight = adjustContentBoxLogicalHeightForBoxSizing((LayoutUnit)styleToUse.logicalHeight().value());
availableHeight = std::max(0_lu, constrainContentBoxLogicalHeightByMinMax(contentBoxHeight - scrollbarLogicalHeight(), std::nullopt));
} else if (shouldComputeLogicalHeightFromAspectRatio()) {
// Only grid is expected to be in a state where it is calculating pref width and having unknown logical width.
if (isRenderGrid() && preferredLogicalWidthsDirty() && !style().logicalWidth().isSpecified())
return availableHeight;
availableHeight = blockSizeFromAspectRatio(horizontalBorderAndPaddingExtent(), verticalBorderAndPaddingExtent(), LayoutUnit(style().logicalAspectRatio()), style().boxSizingForAspectRatio(), logicalWidth());
} else if (isOutOfFlowPositionedWithSpecifiedHeight) {
// Don't allow this to affect the block' size() member variable, since this
// can get called while the block is still laying out its kids.
LogicalExtentComputedValues computedValues = computeLogicalHeight(logicalHeight(), 0_lu);
availableHeight = computedValues.m_extent - borderAndPaddingLogicalHeight() - scrollbarLogicalHeight();
} else if (styleToUse.logicalHeight().isPercentOrCalculated()) {
std::optional<LayoutUnit> heightWithScrollbar = computePercentageLogicalHeight(styleToUse.logicalHeight());
if (heightWithScrollbar) {
LayoutUnit contentBoxHeightWithScrollbar = adjustContentBoxLogicalHeightForBoxSizing(heightWithScrollbar.value());
// We need to adjust for min/max height because this method does not
// handle the min/max of the current block, its caller does. So the
// return value from the recursive call will not have been adjusted
// yet.
LayoutUnit contentBoxHeight = constrainContentBoxLogicalHeightByMinMax(contentBoxHeightWithScrollbar - scrollbarLogicalHeight(), std::nullopt);
availableHeight = std::max(0_lu, contentBoxHeight);
}
} else if (isRenderView())
availableHeight = view().pageOrViewLogicalHeight();
return availableHeight;
}
void RenderBlock::layoutExcludedChildren(bool relayoutChildren)
{
if (!isFieldset())
return;
setIntrinsicBorderForFieldset(0);
RenderBox* box = findFieldsetLegend();
if (!box)
return;
box->setIsExcludedFromNormalLayout(true);
for (auto& child : childrenOfType<RenderBox>(*this)) {
if (&child == box || !child.isLegend())
continue;
child.setIsExcludedFromNormalLayout(false);
}
RenderBox& legend = *box;
if (relayoutChildren)
legend.setChildNeedsLayout(MarkOnlyThis);
legend.layoutIfNeeded();
LayoutUnit logicalLeft;
if (style().isLeftToRightDirection()) {
switch (legend.style().textAlign()) {
case TextAlignMode::Center:
logicalLeft = (logicalWidth() - logicalWidthForChild(legend)) / 2;
break;
case TextAlignMode::Right:
logicalLeft = logicalWidth() - borderEnd() - paddingEnd() - logicalWidthForChild(legend);
break;
default:
logicalLeft = borderStart() + paddingStart() + marginStartForChild(legend);
break;
}
} else {
switch (legend.style().textAlign()) {
case TextAlignMode::Left:
logicalLeft = borderStart() + paddingStart();
break;
case TextAlignMode::Center: {
// Make sure that the extra pixel goes to the end side in RTL (since it went to the end side
// in LTR).
LayoutUnit centeredWidth = logicalWidth() - logicalWidthForChild(legend);
logicalLeft = centeredWidth - centeredWidth / 2;
break;
}
default:
logicalLeft = logicalWidth() - borderStart() - paddingStart() - marginStartForChild(legend) - logicalWidthForChild(legend);
break;
}
}
setLogicalLeftForChild(legend, logicalLeft);
LayoutUnit fieldsetBorderBefore = borderBefore();
LayoutUnit legendLogicalHeight = logicalHeightForChild(legend);
LayoutUnit legendAfterMargin = marginAfterForChild(legend);
LayoutUnit topPositionForLegend = std::max(0_lu, (fieldsetBorderBefore - legendLogicalHeight) / 2);
LayoutUnit bottomPositionForLegend = topPositionForLegend + legendLogicalHeight + legendAfterMargin;
// Place the legend now.
setLogicalTopForChild(legend, topPositionForLegend);
// If the bottom of the legend (including its after margin) is below the fieldset border,
// then we need to add in sufficient intrinsic border to account for this gap.
// FIXME: Should we support the before margin of the legend? Not entirely clear.
// FIXME: Consider dropping support for the after margin of the legend. Not sure other
// browsers support that anyway.
if (bottomPositionForLegend > fieldsetBorderBefore)
setIntrinsicBorderForFieldset(bottomPositionForLegend - fieldsetBorderBefore);
// Now that the legend is included in the border extent, we can set our logical height
// to the borderBefore (which includes the legend and its after margin if they were bigger
// than the actual fieldset border) and then add in our padding before.
setLogicalHeight(borderBefore() + paddingBefore());
}
RenderBox* RenderBlock::findFieldsetLegend(FieldsetFindLegendOption option) const
{
for (auto& legend : childrenOfType<RenderBox>(*this)) {
if (option == FieldsetIgnoreFloatingOrOutOfFlow && legend.isFloatingOrOutOfFlowPositioned())
continue;
if (legend.isLegend())
return const_cast<RenderBox*>(&legend);
}
return nullptr;
}
void RenderBlock::adjustBorderBoxRectForPainting(LayoutRect& paintRect)
{
if (!isFieldset() || !intrinsicBorderForFieldset())
return;
auto* legend = findFieldsetLegend();
if (!legend)
return;
if (style().isHorizontalWritingMode()) {
LayoutUnit yOff = std::max(0_lu, (legend->height() - RenderBox::borderBefore()) / 2);
paintRect.setHeight(paintRect.height() - yOff);
if (style().writingMode() == WritingMode::TopToBottom)
paintRect.setY(paintRect.y() + yOff);
} else {
LayoutUnit xOff = std::max(0_lu, (legend->width() - RenderBox::borderBefore()) / 2);
paintRect.setWidth(paintRect.width() - xOff);
if (style().writingMode() == WritingMode::LeftToRight)
paintRect.setX(paintRect.x() + xOff);
}
}
LayoutRect RenderBlock::paintRectToClipOutFromBorder(const LayoutRect& paintRect)
{
LayoutRect clipRect;
if (!isFieldset())
return clipRect;
auto* legend = findFieldsetLegend();
if (!legend)
return clipRect;
LayoutUnit borderExtent = RenderBox::borderBefore();
if (style().isHorizontalWritingMode()) {
clipRect.setX(paintRect.x() + legend->x());
clipRect.setY(style().writingMode() == WritingMode::TopToBottom ? paintRect.y() : paintRect.y() + paintRect.height() - borderExtent);
clipRect.setWidth(legend->width());
clipRect.setHeight(borderExtent);
} else {
clipRect.setX(style().writingMode() == WritingMode::LeftToRight ? paintRect.x() : paintRect.x() + paintRect.width() - borderExtent);
clipRect.setY(paintRect.y() + legend->y());
clipRect.setWidth(borderExtent);
clipRect.setHeight(legend->height());
}
return clipRect;
}
LayoutUnit RenderBlock::intrinsicBorderForFieldset() const
{
auto* rareData = getBlockRareData(*this);
return rareData ? rareData->m_intrinsicBorderForFieldset : 0_lu;
}
void RenderBlock::setIntrinsicBorderForFieldset(LayoutUnit padding)
{
auto* rareData = getBlockRareData(*this);
if (!rareData) {
if (!padding)
return;
rareData = &ensureBlockRareData(*this);
}
rareData->m_intrinsicBorderForFieldset = padding;
}
LayoutUnit RenderBlock::borderTop() const
{
if (style().writingMode() != WritingMode::TopToBottom || !intrinsicBorderForFieldset())
return RenderBox::borderTop();
return RenderBox::borderTop() + intrinsicBorderForFieldset();
}
LayoutUnit RenderBlock::borderLeft() const
{
if (style().writingMode() != WritingMode::LeftToRight || !intrinsicBorderForFieldset())
return RenderBox::borderLeft();
return RenderBox::borderLeft() + intrinsicBorderForFieldset();
}
LayoutUnit RenderBlock::borderBottom() const
{
if (style().writingMode() != WritingMode::BottomToTop || !intrinsicBorderForFieldset())
return RenderBox::borderBottom();
return RenderBox::borderBottom() + intrinsicBorderForFieldset();
}
LayoutUnit RenderBlock::borderRight() const
{
if (style().writingMode() != WritingMode::RightToLeft || !intrinsicBorderForFieldset())
return RenderBox::borderRight();
return RenderBox::borderRight() + intrinsicBorderForFieldset();
}
LayoutUnit RenderBlock::borderBefore() const
{
return RenderBox::borderBefore() + intrinsicBorderForFieldset();
}
bool RenderBlock::computePreferredWidthsForExcludedChildren(LayoutUnit& minWidth, LayoutUnit& maxWidth) const
{
if (!isFieldset())
return false;
auto* legend = findFieldsetLegend();
if (!legend)
return false;
legend->setIsExcludedFromNormalLayout(true);
computeChildPreferredLogicalWidths(*legend, minWidth, maxWidth);
// These are going to be added in later, so we subtract them out to reflect the
// fact that the legend is outside the scrollable area.
auto scrollbarWidth = intrinsicScrollbarLogicalWidth();
minWidth -= scrollbarWidth;
maxWidth -= scrollbarWidth;
const auto& childStyle = legend->style();
auto startMarginLength = childStyle.marginStartUsing(&style());
auto endMarginLength = childStyle.marginEndUsing(&style());
LayoutUnit margin;
LayoutUnit marginStart;
LayoutUnit marginEnd;
if (startMarginLength.isFixed())
marginStart += startMarginLength.value();
if (endMarginLength.isFixed())
marginEnd += endMarginLength.value();
margin = marginStart + marginEnd;
minWidth += margin;
maxWidth += margin;
return true;
}
LayoutUnit RenderBlock::adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
// FIXME: We're doing this to match other browsers even though it's questionable.
// Shouldn't height:100px mean the fieldset content gets 100px of height even if the
// resulting fieldset becomes much taller because of the legend?
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
if (style().boxSizing() == BoxSizing::ContentBox)
return height + bordersPlusPadding - intrinsicBorderForFieldset();
return std::max(height, bordersPlusPadding);
}
LayoutUnit RenderBlock::adjustContentBoxLogicalHeightForBoxSizing(std::optional<LayoutUnit> height) const
{
// FIXME: We're doing this to match other browsers even though it's questionable.
// Shouldn't height:100px mean the fieldset content gets 100px of height even if the
// resulting fieldset becomes much taller because of the legend?
if (!height)
return 0;
LayoutUnit result = height.value();
if (style().boxSizing() == BoxSizing::BorderBox)
result -= borderAndPaddingLogicalHeight();
else
result -= intrinsicBorderForFieldset();
return std::max(0_lu, result);
}
LayoutUnit RenderBlock::adjustIntrinsicLogicalHeightForBoxSizing(LayoutUnit height) const
{
if (style().boxSizing() == BoxSizing::BorderBox)
return height + borderAndPaddingLogicalHeight();
return height + intrinsicBorderForFieldset();
}
void RenderBlock::paintExcludedChildrenInBorder(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!isFieldset())
return;
RenderBox* box = findFieldsetLegend();
if (!box || !box->isExcludedFromNormalLayout() || box->hasSelfPaintingLayer())
return;
LayoutPoint childPoint = flipForWritingModeForChild(*box, paintOffset);
box->paintAsInlineBlock(paintInfo, childPoint);
}
bool RenderBlock::hitTestExcludedChildrenInBorder(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
if (!isFieldset())
return false;
auto* legend = findFieldsetLegend();
if (!legend || !legend->isExcludedFromNormalLayout() || legend->hasSelfPaintingLayer())
return false;
HitTestAction childHitTest = hitTestAction;
if (hitTestAction == HitTestChildBlockBackgrounds)
childHitTest = HitTestChildBlockBackground;
LayoutPoint childPoint = flipForWritingModeForChild(*legend, accumulatedOffset);
return legend->nodeAtPoint(request, result, locationInContainer, childPoint, childHitTest);
}
String RenderBlock::updateSecurityDiscCharacters(const RenderStyle& style, String&& string)
{
#if !PLATFORM(COCOA)
UNUSED_PARAM(style);
return WTFMove(string);
#else
if (style.textSecurity() == TextSecurity::None)
return WTFMove(string);
// This PUA character in the system font is used to render password field dots on Cocoa platforms.
constexpr UChar textSecurityDiscPUACodePoint = 0xF79A;
auto& font = style.fontCascade().primaryFont();
if (!(font.platformData().isSystemFont() && font.glyphForCharacter(textSecurityDiscPUACodePoint)))
return WTFMove(string);
// See RenderText::setRenderedText()
#if PLATFORM(IOS_FAMILY)
constexpr UChar discCharacterToReplace = blackCircle;
#else
constexpr UChar discCharacterToReplace = bullet;
#endif
return makeStringByReplacingAll(string, discCharacterToReplace, textSecurityDiscPUACodePoint);
#endif
}
LayoutUnit RenderBlock::layoutOverflowLogicalBottom(const RenderBlock& renderer)
{
ASSERT(is<RenderGrid>(renderer) || is<RenderFlexibleBox>(renderer));
auto maxChildLogicalBottom = LayoutUnit { };
for (auto& child : childrenOfType<RenderBox>(renderer)) {
if (child.isOutOfFlowPositioned())
continue;
auto childLogicalBottom = renderer.logicalTopForChild(child) + renderer.logicalHeightForChild(child) + renderer.marginAfterForChild(child);
maxChildLogicalBottom = std::max(maxChildLogicalBottom, childLogicalBottom);
}
return std::max(renderer.clientLogicalBottom(), maxChildLogicalBottom + renderer.paddingAfter());
}
} // namespace WebCore