| /* |
| * 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 "ComplexLineLayout.h" |
| #include "FloatingObjects.h" |
| #include "LineWidth.h" |
| #include "RenderBlock.h" |
| #include "RenderLineBoxList.h" |
| #include "SimpleLineLayout.h" |
| #include "TrailingObjects.h" |
| #include <memory> |
| |
| namespace WebCore { |
| |
| class LineBreaker; |
| class RenderMultiColumnFlow; |
| class RenderRubyRun; |
| |
| #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 (complexLineLayout()) |
| complexLineLayout()->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_discardMarginBefore(false) |
| , m_discardMarginAfter(false) |
| , 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<RootInlineBox> m_lineGridBox; |
| |
| WeakPtr<RenderMultiColumnFlow> m_multiColumnFlow; |
| |
| bool m_discardMarginBefore : 1; |
| bool m_discardMarginAfter : 1; |
| 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; |
| |
| bool m_discardMargin : 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) { ASSERT(!m_discardMargin); m_positiveMargin = p; } |
| void setNegativeMargin(LayoutUnit n) { ASSERT(!m_discardMargin); m_negativeMargin = n; } |
| void setPositiveMarginIfLarger(LayoutUnit p) |
| { |
| ASSERT(!m_discardMargin); |
| if (p > m_positiveMargin) |
| m_positiveMargin = p; |
| } |
| void setNegativeMarginIfLarger(LayoutUnit n) |
| { |
| ASSERT(!m_discardMargin); |
| if (n > m_negativeMargin) |
| m_negativeMargin = n; |
| } |
| |
| void setMargin(LayoutUnit p, LayoutUnit n) { ASSERT(!m_discardMargin); m_positiveMargin = p; m_negativeMargin = n; } |
| void setCanCollapseMarginAfterWithChildren(bool collapse) { m_canCollapseMarginAfterWithChildren = collapse; } |
| void setDiscardMargin(bool value) { m_discardMargin = value; } |
| |
| 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; } |
| bool discardMargin() const { return m_discardMargin; } |
| 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&, bool&) 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(); |
| |
| RootInlineBox* lineGridBox() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_lineGridBox.get() : nullptr; } |
| void setLineGridBox(std::unique_ptr<RootInlineBox> 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(Optional<unsigned> desiredColumnCount = WTF::nullopt) const; |
| virtual bool requiresColumns(int) const; |
| |
| bool containsFloats() const override { return m_floatingObjects && !m_floatingObjects->set().isEmpty(); } |
| bool containsFloat(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; |
| |
| RootInlineBox* firstRootBox() const { return complexLineLayout() ? complexLineLayout()->firstRootBox() : nullptr; } |
| RootInlineBox* lastRootBox() const { return complexLineLayout() ? complexLineLayout()->lastRootBox() : nullptr; } |
| |
| bool hasLines() const; |
| void invalidateLineLayoutPath() final; |
| |
| enum LineLayoutPath { UndeterminedPath = 0, SimpleLinesPath, LineBoxesPath, ForceLineBoxesPath }; |
| LineLayoutPath lineLayoutPath() const { return static_cast<LineLayoutPath>(renderBlockFlowLineLayoutPath()); } |
| void setLineLayoutPath(LineLayoutPath path) { setRenderBlockFlowLineLayoutPath(path); } |
| |
| // Helper methods for computing line counts and heights for line counts. |
| RootInlineBox* lineAtIndex(int) const; |
| int lineCount(const RootInlineBox* = nullptr, bool* = nullptr) const; |
| int heightForLineCount(int); |
| void clearTruncation(); |
| |
| void setHasMarkupTruncation(bool b) { setRenderBlockFlowHasMarkupTruncation(b); } |
| bool hasMarkupTruncation() const { return renderBlockFlowHasMarkupTruncation(); } |
| |
| bool containsNonZeroBidiLevel() const; |
| |
| const SimpleLineLayout::Layout* simpleLineLayout() const; |
| SimpleLineLayout::Layout* simpleLineLayout(); |
| const ComplexLineLayout* complexLineLayout() const; |
| ComplexLineLayout* complexLineLayout(); |
| |
| void deleteLineBoxesBeforeSimpleLineLayout(); |
| void ensureLineBoxes(); |
| void generateLineBoxTree(); |
| |
| #if ENABLE(TREE_DEBUGGING) |
| void outputLineTreeAndMark(WTF::TextStream&, const InlineBox* 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 addFloatsToNewParent(RenderBlockFlow& toBlockFlow) 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)); |
| rareBlockFlowData()->m_discardMarginBefore = false; |
| rareBlockFlowData()->m_discardMarginAfter = false; |
| } |
| |
| void setMaxMarginBeforeValues(LayoutUnit pos, LayoutUnit neg); |
| void setMaxMarginAfterValues(LayoutUnit pos, LayoutUnit neg); |
| |
| void setMustDiscardMarginBefore(bool = true); |
| void setMustDiscardMarginAfter(bool = true); |
| |
| bool mustDiscardMarginBefore() const; |
| bool mustDiscardMarginAfter() const; |
| |
| bool mustDiscardMarginBeforeForChild(const RenderBox&) const; |
| bool mustDiscardMarginAfterForChild(const RenderBox&) const; |
| bool mustSeparateMarginBeforeForChild(const RenderBox&) const; |
| bool mustSeparateMarginAfterForChild(const RenderBox&) const; |
| |
| void styleWillChange(StyleDifference, const RenderStyle& newStyle) override; |
| void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override; |
| |
| void createFloatingObjects(); |
| |
| Optional<int> firstLineBaseline() const override; |
| Optional<int> 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(Clear); |
| 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 fitBorderToLinesIfNeeded(); // Shrink the box in which the border paints if border-fit is set. |
| void adjustForBorderFit(LayoutUnit x, LayoutUnit& left, LayoutUnit& right) const; |
| |
| void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0); |
| |
| GapRects inlineSelectionGaps(RenderBlock& rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock, |
| LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const LogicalSelectionOffsetCaches&, const PaintInfo*) override; |
| |
| Position positionForBox(InlineBox*, bool start = true) const; |
| VisiblePosition positionForPointWithInlineChildren(const LayoutPoint& pointInLogicalContents, const RenderFragmentContainer*) override; |
| void addFocusRingRectsForInlineChildren(Vector<LayoutRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*) override; |
| |
| public: |
| virtual Optional<TextAlignMode> overrideTextAlignmentForLine(bool /* endsWithSoftBreak */) const { return { }; } |
| virtual void adjustInlineDirectionLineBounds(int /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { } |
| |
| private: |
| bool hasSimpleLineLayout() const; |
| bool hasComplexLineLayout() const; |
| |
| void layoutSimpleLines(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom); |
| |
| 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 |
| void setSelectionState(SelectionState) final; |
| |
| public: |
| // FIXME-BLOCKFLOW: These can be made protected again once all callers have been moved here. |
| void adjustLinePositionForPagination(RootInlineBox*, 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: |
| Variant<std::nullptr_t, std::unique_ptr<ComplexLineLayout>, Ref<SimpleLineLayout::Layout>> m_lineLayout; |
| |
| friend class LineBreaker; |
| friend class LineWidth; // Needs to know FloatingObject |
| friend class ComplexLineLayout; |
| }; |
| |
| inline bool RenderBlockFlow::hasComplexLineLayout() const |
| { |
| return WTF::holds_alternative<std::unique_ptr<ComplexLineLayout>>(m_lineLayout); |
| } |
| |
| inline const ComplexLineLayout* RenderBlockFlow::complexLineLayout() const |
| { |
| return hasComplexLineLayout() ? WTF::get<std::unique_ptr<ComplexLineLayout>>(m_lineLayout).get() : nullptr; |
| } |
| |
| inline ComplexLineLayout* RenderBlockFlow::complexLineLayout() |
| { |
| return hasComplexLineLayout() ? WTF::get<std::unique_ptr<ComplexLineLayout>>(m_lineLayout).get() : nullptr; |
| } |
| |
| inline bool RenderBlockFlow::hasSimpleLineLayout() const |
| { |
| return WTF::holds_alternative<Ref<SimpleLineLayout::Layout>>(m_lineLayout); |
| } |
| |
| inline const SimpleLineLayout::Layout* RenderBlockFlow::simpleLineLayout() const |
| { |
| return hasSimpleLineLayout() ? WTF::get<Ref<SimpleLineLayout::Layout>>(m_lineLayout).ptr() : nullptr; |
| } |
| |
| inline SimpleLineLayout::Layout* RenderBlockFlow::simpleLineLayout() |
| { |
| return hasSimpleLineLayout() ? WTF::get<Ref<SimpleLineLayout::Layout>>(m_lineLayout).ptr() : nullptr; |
| } |
| |
| } // namespace WebCore |
| |
| SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderBlockFlow, isRenderBlockFlow()) |
