blob: 4db5c244876710ea7e88ee550e952cfd11fa81eb [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) 2003-2013, Apple Inc. 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.
*/
#pragma once
#include "FloatingObjects.h"
#include "LegacyLineLayout.h"
#include "LineWidth.h"
#include "RenderBlock.h"
#include "RenderLineBoxList.h"
#include "TrailingObjects.h"
#include <memory>
namespace WebCore {
class LineBreaker;
class RenderMultiColumnFlow;
class RenderRubyRun;
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
namespace LayoutIntegration {
class LineLayout;
}
#endif
#if ENABLE(TEXT_AUTOSIZING)
enum LineCount {
NOT_SET = 0, NO_LINE = 1, ONE_LINE = 2, MULTI_LINE = 3
};
#endif
class RenderBlockFlow : public RenderBlock {
WTF_MAKE_ISO_ALLOCATED(RenderBlockFlow);
public:
RenderBlockFlow(Element&, RenderStyle&&);
RenderBlockFlow(Document&, RenderStyle&&);
virtual ~RenderBlockFlow();
void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0_lu) override;
protected:
void willBeDestroyed() override;
// This method is called at the start of layout to wipe away all of the floats in our floating objects list. It also
// repopulates the list with any floats that intrude from previous siblings or parents. Floats that were added by
// descendants are gone when this call completes and will get added back later on after the children have gotten
// a relayout.
void rebuildFloatingObjectSetFromIntrudingFloats();
// RenderBlockFlow always contains either lines or paragraphs. When the children are all blocks (e.g. paragraphs), we call layoutBlockChildren.
// When the children are all inline (e.g., lines), we call layoutInlineChildren.
void layoutBlockChildren(bool relayoutChildren, LayoutUnit& maxFloatLogicalBottom);
void layoutInlineChildren(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom);
// RenderBlockFlows override these methods, since they are the only class that supports margin collapsing.
LayoutUnit collapsedMarginBefore() const final { return maxPositiveMarginBefore() - maxNegativeMarginBefore(); }
LayoutUnit collapsedMarginAfter() const final { return maxPositiveMarginAfter() - maxNegativeMarginAfter(); }
void dirtyLinesFromChangedChild(RenderObject& child) final
{
if (legacyLineLayout())
legacyLineLayout()->lineBoxes().dirtyLinesFromChangedChild(*this, child);
}
void paintColumnRules(PaintInfo&, const LayoutPoint&) override;
public:
class MarginValues {
public:
MarginValues(LayoutUnit beforePos, LayoutUnit beforeNeg, LayoutUnit afterPos, LayoutUnit afterNeg)
: m_positiveMarginBefore(beforePos)
, m_negativeMarginBefore(beforeNeg)
, m_positiveMarginAfter(afterPos)
, m_negativeMarginAfter(afterNeg)
{
}
LayoutUnit positiveMarginBefore() const { return m_positiveMarginBefore; }
LayoutUnit negativeMarginBefore() const { return m_negativeMarginBefore; }
LayoutUnit positiveMarginAfter() const { return m_positiveMarginAfter; }
LayoutUnit negativeMarginAfter() const { return m_negativeMarginAfter; }
void setPositiveMarginBefore(LayoutUnit pos) { m_positiveMarginBefore = pos; }
void setNegativeMarginBefore(LayoutUnit neg) { m_negativeMarginBefore = neg; }
void setPositiveMarginAfter(LayoutUnit pos) { m_positiveMarginAfter = pos; }
void setNegativeMarginAfter(LayoutUnit neg) { m_negativeMarginAfter = neg; }
private:
LayoutUnit m_positiveMarginBefore;
LayoutUnit m_negativeMarginBefore;
LayoutUnit m_positiveMarginAfter;
LayoutUnit m_negativeMarginAfter;
};
MarginValues marginValuesForChild(RenderBox& child) const;
// Allocated only when some of these fields have non-default values
struct RenderBlockFlowRareData {
WTF_MAKE_NONCOPYABLE(RenderBlockFlowRareData); WTF_MAKE_FAST_ALLOCATED;
public:
RenderBlockFlowRareData(const RenderBlockFlow& block)
: m_margins(positiveMarginBeforeDefault(block), negativeMarginBeforeDefault(block), positiveMarginAfterDefault(block), negativeMarginAfterDefault(block))
, m_lineBreakToAvoidWidow(-1)
, m_didBreakAtLineToAvoidWidow(false)
{
}
static LayoutUnit positiveMarginBeforeDefault(const RenderBlock& block)
{
return std::max<LayoutUnit>(block.marginBefore(), 0);
}
static LayoutUnit negativeMarginBeforeDefault(const RenderBlock& block)
{
return std::max<LayoutUnit>(-block.marginBefore(), 0);
}
static LayoutUnit positiveMarginAfterDefault(const RenderBlock& block)
{
return std::max<LayoutUnit>(block.marginAfter(), 0);
}
static LayoutUnit negativeMarginAfterDefault(const RenderBlock& block)
{
return std::max<LayoutUnit>(-block.marginAfter(), 0);
}
MarginValues m_margins;
int m_lineBreakToAvoidWidow;
std::unique_ptr<LegacyRootInlineBox> m_lineGridBox;
WeakPtr<RenderMultiColumnFlow> m_multiColumnFlow;
bool m_didBreakAtLineToAvoidWidow : 1;
};
class MarginInfo {
// Collapsing flags for whether we can collapse our margins with our children's margins.
bool m_canCollapseWithChildren : 1;
bool m_canCollapseMarginBeforeWithChildren : 1;
bool m_canCollapseMarginAfterWithChildren : 1;
// Whether or not we are a quirky container, i.e., do we collapse away top and bottom
// margins in our container. Table cells and the body are the common examples. We
// also have a custom style property for Safari RSS to deal with TypePad blog articles.
bool m_quirkContainer : 1;
// This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block.
// They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will
// always be collapsing with one another. This variable can remain set to true through multiple iterations
// as long as we keep encountering self-collapsing blocks.
bool m_atBeforeSideOfBlock : 1;
// This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block.
bool m_atAfterSideOfBlock : 1;
// These variables are used to detect quirky margins that we need to collapse away (in table cells
// and in the body element).
bool m_hasMarginBeforeQuirk : 1;
bool m_hasMarginAfterQuirk : 1;
bool m_determinedMarginBeforeQuirk : 1;
// These flags track the previous maximal positive and negative margins.
LayoutUnit m_positiveMargin;
LayoutUnit m_negativeMargin;
public:
MarginInfo(const RenderBlockFlow&, LayoutUnit beforeBorderPadding, LayoutUnit afterBorderPadding);
void setAtBeforeSideOfBlock(bool b) { m_atBeforeSideOfBlock = b; }
void setAtAfterSideOfBlock(bool b) { m_atAfterSideOfBlock = b; }
void clearMargin()
{
m_positiveMargin = 0;
m_negativeMargin = 0;
}
void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }
void setDeterminedMarginBeforeQuirk(bool b) { m_determinedMarginBeforeQuirk = b; }
void setPositiveMargin(LayoutUnit p) { m_positiveMargin = p; }
void setNegativeMargin(LayoutUnit n) { m_negativeMargin = n; }
void setPositiveMarginIfLarger(LayoutUnit p)
{
if (p > m_positiveMargin)
m_positiveMargin = p;
}
void setNegativeMarginIfLarger(LayoutUnit n)
{
if (n > m_negativeMargin)
m_negativeMargin = n;
}
void setMargin(LayoutUnit p, LayoutUnit n) { m_positiveMargin = p; m_negativeMargin = n; }
void setCanCollapseMarginAfterWithChildren(bool collapse) { m_canCollapseMarginAfterWithChildren = collapse; }
bool atBeforeSideOfBlock() const { return m_atBeforeSideOfBlock; }
bool canCollapseWithMarginBefore() const { return m_atBeforeSideOfBlock && m_canCollapseMarginBeforeWithChildren; }
bool canCollapseWithMarginAfter() const { return m_atAfterSideOfBlock && m_canCollapseMarginAfterWithChildren; }
bool canCollapseMarginBeforeWithChildren() const { return m_canCollapseMarginBeforeWithChildren; }
bool canCollapseMarginAfterWithChildren() const { return m_canCollapseMarginAfterWithChildren; }
bool quirkContainer() const { return m_quirkContainer; }
bool determinedMarginBeforeQuirk() const { return m_determinedMarginBeforeQuirk; }
bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }
LayoutUnit positiveMargin() const { return m_positiveMargin; }
LayoutUnit negativeMargin() const { return m_negativeMargin; }
LayoutUnit margin() const { return m_positiveMargin - m_negativeMargin; }
};
LayoutUnit marginOffsetForSelfCollapsingBlock();
void layoutBlockChild(RenderBox& child, MarginInfo&, LayoutUnit& previousFloatLogicalBottom, LayoutUnit& maxFloatLogicalBottom);
void adjustPositionedBlock(RenderBox& child, const MarginInfo&);
void adjustFloatingBlock(const MarginInfo&);
void setStaticInlinePositionForChild(RenderBox& child, LayoutUnit blockOffset, LayoutUnit inlinePosition);
void updateStaticInlinePositionForChild(RenderBox& child, LayoutUnit logicalTop, IndentTextOrNot shouldIndentText);
LayoutUnit startAlignedOffsetForLine(LayoutUnit position, IndentTextOrNot);
LayoutUnit collapseMargins(RenderBox& child, MarginInfo&);
LayoutUnit collapseMarginsWithChildInfo(RenderBox* child, RenderObject* prevSibling, MarginInfo&);
LayoutUnit clearFloatsIfNeeded(RenderBox& child, MarginInfo&, LayoutUnit oldTopPosMargin, LayoutUnit oldTopNegMargin, LayoutUnit yPos);
LayoutUnit estimateLogicalTopPosition(RenderBox& child, const MarginInfo&, LayoutUnit& estimateWithoutPagination);
void marginBeforeEstimateForChild(RenderBox&, LayoutUnit&, LayoutUnit&) const;
void handleAfterSideOfBlock(LayoutUnit top, LayoutUnit bottom, MarginInfo&);
void setCollapsedBottomMargin(const MarginInfo&);
bool childrenPreventSelfCollapsing() const final;
bool shouldBreakAtLineToAvoidWidow() const { return hasRareBlockFlowData() && rareBlockFlowData()->m_lineBreakToAvoidWidow >= 0; }
void clearShouldBreakAtLineToAvoidWidow() const;
int lineBreakToAvoidWidow() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_lineBreakToAvoidWidow : -1; }
void setBreakAtLineToAvoidWidow(int);
void clearDidBreakAtLineToAvoidWidow();
void setDidBreakAtLineToAvoidWidow();
bool didBreakAtLineToAvoidWidow() const { return hasRareBlockFlowData() && rareBlockFlowData()->m_didBreakAtLineToAvoidWidow; }
bool relayoutToAvoidWidows();
LegacyRootInlineBox* lineGridBox() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_lineGridBox.get() : nullptr; }
void setLineGridBox(std::unique_ptr<LegacyRootInlineBox> box)
{
ensureRareBlockFlowData().m_lineGridBox = WTFMove(box);
}
void layoutLineGridBox();
RenderMultiColumnFlow* multiColumnFlow() const { return hasRareBlockFlowData() ? multiColumnFlowSlowCase() : nullptr; }
RenderMultiColumnFlow* multiColumnFlowSlowCase() const;
void setMultiColumnFlow(RenderMultiColumnFlow&);
void clearMultiColumnFlow();
bool willCreateColumns(std::optional<unsigned> desiredColumnCount = std::nullopt) const;
virtual bool requiresColumns(int) const;
bool containsFloats() const override { return m_floatingObjects && !m_floatingObjects->set().isEmpty(); }
bool containsFloat(RenderBox&) const;
bool subtreeContainsFloats() const;
bool subtreeContainsFloat(RenderBox&) const;
void deleteLines() override;
void computeOverflow(LayoutUnit oldClientAfterEdge, bool recomputeFloats = false) override;
Position positionForPoint(const LayoutPoint&) override;
VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override;
LayoutUnit lowestFloatLogicalBottom(FloatingObject::Type = FloatingObject::FloatLeftRight) const;
void removeFloatingObjects();
void markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove = nullptr, bool inLayout = true);
void markSiblingsWithFloatsForLayout(RenderBox* floatToRemove = nullptr);
const FloatingObjectSet* floatingObjectSet() const { return m_floatingObjects ? &m_floatingObjects->set() : nullptr; }
LayoutUnit logicalTopForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.y() : floatingObject.x(); }
LayoutUnit logicalBottomForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.maxY() : floatingObject.maxX(); }
LayoutUnit logicalLeftForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.x() : floatingObject.y(); }
LayoutUnit logicalRightForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.maxX() : floatingObject.maxY(); }
LayoutUnit logicalWidthForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.width() : floatingObject.height(); }
LayoutUnit logicalHeightForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.height() : floatingObject.width(); }
void setLogicalTopForFloat(FloatingObject& floatingObject, LayoutUnit logicalTop)
{
if (isHorizontalWritingMode())
floatingObject.setY(logicalTop);
else
floatingObject.setX(logicalTop);
}
void setLogicalLeftForFloat(FloatingObject& floatingObject, LayoutUnit logicalLeft)
{
if (isHorizontalWritingMode())
floatingObject.setX(logicalLeft);
else
floatingObject.setY(logicalLeft);
}
void setLogicalHeightForFloat(FloatingObject& floatingObject, LayoutUnit logicalHeight)
{
if (isHorizontalWritingMode())
floatingObject.setHeight(logicalHeight);
else
floatingObject.setWidth(logicalHeight);
}
void setLogicalWidthForFloat(FloatingObject& floatingObject, LayoutUnit logicalWidth)
{
if (isHorizontalWritingMode())
floatingObject.setWidth(logicalWidth);
else
floatingObject.setHeight(logicalWidth);
}
void setLogicalMarginsForFloat(FloatingObject& floatingObject, LayoutUnit logicalLeftMargin, LayoutUnit logicalBeforeMargin)
{
if (isHorizontalWritingMode())
floatingObject.setMarginOffset(LayoutSize(logicalLeftMargin, logicalBeforeMargin));
else
floatingObject.setMarginOffset(LayoutSize(logicalBeforeMargin, logicalLeftMargin));
}
LayoutPoint flipFloatForWritingModeForChild(const FloatingObject&, const LayoutPoint&) const;
LegacyRootInlineBox* firstRootBox() const { return legacyLineLayout() ? legacyLineLayout()->firstRootBox() : nullptr; }
LegacyRootInlineBox* lastRootBox() const { return legacyLineLayout() ? legacyLineLayout()->lastRootBox() : nullptr; }
void setChildrenInline(bool) final;
bool hasLines() const;
void invalidateLineLayoutPath() final;
void computeAndSetLineLayoutPath();
enum LineLayoutPath { UndeterminedPath = 0, ModernPath, LegacyPath, ForcedLegacyPath };
LineLayoutPath lineLayoutPath() const { return static_cast<LineLayoutPath>(renderBlockFlowLineLayoutPath()); }
void setLineLayoutPath(LineLayoutPath path) { setRenderBlockFlowLineLayoutPath(path); }
int lineCount() const;
void clearTruncation();
void setHasMarkupTruncation(bool b) { setRenderBlockFlowHasMarkupTruncation(b); }
bool hasMarkupTruncation() const { return renderBlockFlowHasMarkupTruncation(); }
bool containsNonZeroBidiLevel() const;
const LegacyLineLayout* legacyLineLayout() const;
LegacyLineLayout* legacyLineLayout();
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
const LayoutIntegration::LineLayout* modernLineLayout() const;
LayoutIntegration::LineLayout* modernLineLayout();
#endif
#if ENABLE(TREE_DEBUGGING)
void outputFloatingObjects(WTF::TextStream&, int depth) const;
void outputLineTreeAndMark(WTF::TextStream&, const LegacyInlineBox* markedBox, int depth) const;
#endif
// Returns the logicalOffset at the top of the next page. If the offset passed in is already at the top of the current page,
// then nextPageLogicalTop with ExcludePageBoundary will still move to the top of the next page. nextPageLogicalTop with
// IncludePageBoundary set will not.
//
// For a page height of 800px, the first rule will return 800 if the value passed in is 0. The second rule will simply return 0.
enum PageBoundaryRule { ExcludePageBoundary, IncludePageBoundary };
LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const;
LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const;
LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule = IncludePageBoundary) const;
LayoutUnit logicalHeightForChildForFragmentation(const RenderBox& child) const;
bool hasNextPage(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
void updateColumnProgressionFromStyle(RenderStyle&);
void updateStylesForColumnChildren();
bool needsLayoutAfterFragmentRangeChange() const override;
WEBCORE_EXPORT RenderText* findClosestTextAtAbsolutePoint(const FloatPoint&);
// A page break is required at some offset due to space shortage in the current fragmentainer.
void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage);
// Update minimum page height required to avoid fragmentation where it shouldn't occur (inside
// unbreakable content, between orphans and widows, etc.). This will be used as a hint to the
// column balancer to help set a good minimum column height.
void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight);
void adjustSizeContainmentChildForPagination(RenderBox& child, LayoutUnit offset);
void addFloatsToNewParent(RenderBlockFlow& toBlockFlow) const;
LayoutUnit endPaddingWidthForCaret() const;
LayoutUnit adjustSelectionTopForPrecedingBlock(LayoutUnit top) const;
protected:
bool shouldResetLogicalHeightBeforeLayout() const override { return true; }
void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
bool pushToNextPageWithMinimumLogicalHeight(LayoutUnit& adjustment, LayoutUnit logicalOffset, LayoutUnit minimumLogicalHeight) const;
// If the child is unsplittable and can't fit on the current page, return the top of the next page/column.
LayoutUnit adjustForUnsplittableChild(RenderBox& child, LayoutUnit logicalOffset, LayoutUnit beforeMargin = 0_lu, LayoutUnit afterMargin = 0_lu);
LayoutUnit adjustBlockChildForPagination(LayoutUnit logicalTopAfterClear, LayoutUnit estimateWithoutPagination, RenderBox& child, bool atBeforeSideOfBlock);
LayoutUnit applyBeforeBreak(RenderBox& child, LayoutUnit logicalOffset); // If the child has a before break, then return a new yPos that shifts to the top of the next page/column.
LayoutUnit applyAfterBreak(RenderBox& child, LayoutUnit logicalOffset, MarginInfo&); // If the child has an after break, then return a new offset that shifts to the top of the next page/column.
LayoutUnit maxPositiveMarginBefore() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.positiveMarginBefore() : RenderBlockFlowRareData::positiveMarginBeforeDefault(*this); }
LayoutUnit maxNegativeMarginBefore() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.negativeMarginBefore() : RenderBlockFlowRareData::negativeMarginBeforeDefault(*this); }
LayoutUnit maxPositiveMarginAfter() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.positiveMarginAfter() : RenderBlockFlowRareData::positiveMarginAfterDefault(*this); }
LayoutUnit maxNegativeMarginAfter() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.negativeMarginAfter() : RenderBlockFlowRareData::negativeMarginAfterDefault(*this); }
void initMaxMarginValues()
{
if (!hasRareBlockFlowData())
return;
rareBlockFlowData()->m_margins = MarginValues(RenderBlockFlowRareData::positiveMarginBeforeDefault(*this) , RenderBlockFlowRareData::negativeMarginBeforeDefault(*this),
RenderBlockFlowRareData::positiveMarginAfterDefault(*this), RenderBlockFlowRareData::negativeMarginAfterDefault(*this));
}
void setMaxMarginBeforeValues(LayoutUnit pos, LayoutUnit neg);
void setMaxMarginAfterValues(LayoutUnit pos, LayoutUnit neg);
void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
void createFloatingObjects();
std::optional<LayoutUnit> firstLineBaseline() const override;
std::optional<LayoutUnit> inlineBlockBaseline(LineDirectionMode) const override;
bool isMultiColumnBlockFlow() const override { return multiColumnFlow(); }
void setComputedColumnCountAndWidth(int, LayoutUnit);
LayoutUnit computedColumnWidth() const;
unsigned computedColumnCount() const;
bool isTopLayoutOverflowAllowed() const override;
bool isLeftLayoutOverflowAllowed() const override;
virtual void computeColumnCountAndWidth();
virtual void cachePriorCharactersIfNeeded(const LazyLineBreakIterator&) {};
protected:
// Called to lay out the legend for a fieldset or the ruby text of a ruby run. Also used by multi-column layout to handle
// the flow thread child.
void layoutExcludedChildren(bool relayoutChildren) override;
void addOverflowFromFloats();
private:
bool recomputeLogicalWidthAndColumnWidth();
LayoutUnit columnGap() const;
RenderBlockFlow* previousSiblingWithOverhangingFloats(bool& parentHasFloats) const;
void checkForPaginationLogicalHeightChange(bool& relayoutChildren, LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged);
void paintInlineChildren(PaintInfo&, const LayoutPoint&) override;
void paintFloats(PaintInfo&, const LayoutPoint&, bool preservePhase = false) override;
void repaintOverhangingFloats(bool paintAllDescendants) final;
void clipOutFloatingObjects(RenderBlock&, const PaintInfo*, const LayoutPoint&, const LayoutSize&) override;
FloatingObject* insertFloatingObject(RenderBox&);
void removeFloatingObject(RenderBox&);
void removeFloatingObjectsBelow(FloatingObject*, int logicalOffset);
void computeLogicalLocationForFloat(FloatingObject&, LayoutUnit& logicalTopOffset);
// Called from lineWidth, to position the floats added in the last line.
// Returns true if and only if it has positioned any floats.
bool positionNewFloats();
void clearFloats(UsedClear);
FloatingObjects* floatingObjects() { return m_floatingObjects.get(); }
LayoutUnit logicalRightFloatOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, LayoutUnit logicalHeight) const override;
LayoutUnit logicalLeftFloatOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, LayoutUnit logicalHeight) const override;
LayoutUnit logicalRightOffsetForPositioningFloat(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining) const;
LayoutUnit logicalLeftOffsetForPositioningFloat(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining) const;
LayoutUnit lowestInitialLetterLogicalBottom() const;
LayoutUnit nextFloatLogicalBottomBelow(LayoutUnit) const;
LayoutUnit nextFloatLogicalBottomBelowForBlock(LayoutUnit) const;
LayoutUnit addOverhangingFloats(RenderBlockFlow& child, bool makeChildPaintOtherFloats);
bool hasOverhangingFloat(RenderBox&);
void addIntrudingFloats(RenderBlockFlow* prev, RenderBlockFlow* container, LayoutUnit xoffset, LayoutUnit yoffset);
bool hasOverhangingFloats() { return parent() && containsFloats() && lowestFloatLogicalBottom() > logicalHeight(); }
LayoutUnit getClearDelta(RenderBox& child, LayoutUnit yPos);
void determineLogicalLeftPositionForChild(RenderBox& child, ApplyLayoutDeltaMode = DoNotApplyLayoutDelta);
bool hitTestFloats(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override;
bool hitTestInlineChildren(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
void addOverflowFromInlineChildren() override;
void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, LegacyRootInlineBox* highest = 0);
GapRects inlineSelectionGaps(RenderBlock& rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const LogicalSelectionOffsetCaches&, const PaintInfo*) override;
VisiblePosition positionForPointWithInlineChildren(const LayoutPoint& pointInLogicalContents, const RenderFragmentContainer*) override;
void addFocusRingRectsForInlineChildren(Vector<LayoutRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*) override;
public:
virtual std::optional<TextAlignMode> overrideTextAlignmentForLine(bool /* endsWithSoftBreak */) const { return { }; }
virtual void adjustInlineDirectionLineBounds(int /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }
private:
bool hasLineLayout() const;
bool hasLegacyLineLayout() const;
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
bool hasModernLineLayout() const;
void layoutModernLines(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom);
bool tryComputePreferredWidthsUsingModernPath(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth);
#endif
void adjustIntrinsicLogicalWidthsForColumns(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
void computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
void adjustInitialLetterPosition(RenderBox& childBox, LayoutUnit& logicalTopOffset, LayoutUnit& marginBeforeOffset);
#if ENABLE(TEXT_AUTOSIZING)
int m_widthForTextAutosizing;
unsigned m_lineCountForTextAutosizing : 2;
#endif
public:
// FIXME-BLOCKFLOW: These can be made protected again once all callers have been moved here.
void adjustLinePositionForPagination(LegacyRootInlineBox*, LayoutUnit& deltaOffset, bool& overflowsFragment, RenderFragmentedFlow*); // Computes a deltaOffset value that put a line at the top of the next page if it doesn't fit on the current page.
// Pagination routines.
bool relayoutForPagination();
bool hasRareBlockFlowData() const { return m_rareBlockFlowData.get(); }
RenderBlockFlowRareData* rareBlockFlowData() const { ASSERT_WITH_SECURITY_IMPLICATION(hasRareBlockFlowData()); return m_rareBlockFlowData.get(); }
RenderBlockFlowRareData& ensureRareBlockFlowData();
void materializeRareBlockFlowData();
#if ENABLE(TEXT_AUTOSIZING)
int lineCountForTextAutosizing();
void adjustComputedFontSizes(float size, float visibleWidth);
void resetComputedFontSize()
{
m_widthForTextAutosizing = -1;
m_lineCountForTextAutosizing = NOT_SET;
}
#endif
protected:
std::unique_ptr<FloatingObjects> m_floatingObjects;
std::unique_ptr<RenderBlockFlowRareData> m_rareBlockFlowData;
private:
std::variant<
std::monostate,
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
std::unique_ptr<LayoutIntegration::LineLayout>,
#endif
std::unique_ptr<LegacyLineLayout>
> m_lineLayout;
friend class LineBreaker;
friend class LineWidth; // Needs to know FloatingObject
friend class LegacyLineLayout;
};
inline bool RenderBlockFlow::hasLineLayout() const
{
return !std::holds_alternative<std::monostate>(m_lineLayout);
}
inline bool RenderBlockFlow::hasLegacyLineLayout() const
{
return std::holds_alternative<std::unique_ptr<LegacyLineLayout>>(m_lineLayout);
}
inline const LegacyLineLayout* RenderBlockFlow::legacyLineLayout() const
{
return hasLegacyLineLayout() ? std::get<std::unique_ptr<LegacyLineLayout>>(m_lineLayout).get() : nullptr;
}
inline LegacyLineLayout* RenderBlockFlow::legacyLineLayout()
{
return hasLegacyLineLayout() ? std::get<std::unique_ptr<LegacyLineLayout>>(m_lineLayout).get() : nullptr;
}
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
inline bool RenderBlockFlow::hasModernLineLayout() const
{
return std::holds_alternative<std::unique_ptr<LayoutIntegration::LineLayout>>(m_lineLayout);
}
inline const LayoutIntegration::LineLayout* RenderBlockFlow::modernLineLayout() const
{
return hasModernLineLayout() ? std::get<std::unique_ptr<LayoutIntegration::LineLayout>>(m_lineLayout).get() : nullptr;
}
inline LayoutIntegration::LineLayout* RenderBlockFlow::modernLineLayout()
{
return hasModernLineLayout() ? std::get<std::unique_ptr<LayoutIntegration::LineLayout>>(m_lineLayout).get() : nullptr;
}
#endif
inline LayoutUnit RenderBlockFlow::endPaddingWidthForCaret() const
{
if (element() && element()->isRootEditableElement() && hasNonVisibleOverflow() && style().isLeftToRightDirection() && !paddingEnd())
return caretWidth;
return { };
}
bool shouldIncludeLinesForParentLineCount(const RenderBlockFlow&);
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderBlockFlow, isRenderBlockFlow())