RenderMultiColumnFlowThread.h [plain text]
#pragma once
#include "RenderFlowThread.h"
#include <wtf/HashMap.h>
namespace WebCore {
class RenderMultiColumnSet;
class RenderMultiColumnSpannerPlaceholder;
class RenderMultiColumnFlowThread final : public RenderFlowThread {
public:
RenderMultiColumnFlowThread(Document&, RenderStyle&&);
~RenderMultiColumnFlowThread();
RenderBlockFlow* multiColumnBlockFlow() const { return downcast<RenderBlockFlow>(parent()); }
RenderMultiColumnSet* firstMultiColumnSet() const;
RenderMultiColumnSet* lastMultiColumnSet() const;
RenderBox* firstColumnSetOrSpanner() const;
static RenderBox* nextColumnSetOrSpannerSiblingOf(const RenderBox*);
static RenderBox* previousColumnSetOrSpannerSiblingOf(const RenderBox*);
RenderMultiColumnSpannerPlaceholder* findColumnSpannerPlaceholder(RenderBox* spanner) const { return m_spannerMap.get(spanner); }
void layout() override;
void populate();
void evacuateAndDestroy();
unsigned columnCount() const { return m_columnCount; }
LayoutUnit columnWidth() const { return m_columnWidth; }
LayoutUnit columnHeightAvailable() const { return m_columnHeightAvailable; }
void setColumnHeightAvailable(LayoutUnit available) { m_columnHeightAvailable = available; }
bool inBalancingPass() const { return m_inBalancingPass; }
void setInBalancingPass(bool balancing) { m_inBalancingPass = balancing; }
bool needsHeightsRecalculation() const { return m_needsHeightsRecalculation; }
void setNeedsHeightsRecalculation(bool recalculate) { m_needsHeightsRecalculation = recalculate; }
bool shouldRelayoutForPagination() const { return !m_inBalancingPass && m_needsHeightsRecalculation; }
void setColumnCountAndWidth(unsigned count, LayoutUnit width)
{
m_columnCount = count;
m_columnWidth = width;
}
bool progressionIsInline() const { return m_progressionIsInline; }
void setProgressionIsInline(bool progressionIsInline) { m_progressionIsInline = progressionIsInline; }
bool progressionIsReversed() const { return m_progressionIsReversed; }
void setProgressionIsReversed(bool reversed) { m_progressionIsReversed = reversed; }
void computeLineGridPaginationOrigin(LayoutState&) const;
RenderRegion* mapFromFlowToRegion(TransformState&) const override;
LayoutSize physicalTranslationOffsetFromFlowToRegion(const RenderRegion*, const LayoutUnit) const;
RenderRegion* physicalTranslationFromFlowToRegion(LayoutPoint&) const;
LayoutSize physicalTranslationFromRegionToFlow(const RenderMultiColumnSet*, const LayoutPoint&) const;
bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override;
LayoutSize offsetFromContainer(RenderElement&, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const override;
bool shouldCheckColumnBreaks() const override;
private:
bool isRenderMultiColumnFlowThread() const override { return true; }
const char* renderName() const override;
void addRegionToThread(RenderRegion*) override;
void willBeRemovedFromTree() override;
RenderObject* resolveMovedChild(RenderObject* child) const override;
void flowThreadDescendantInserted(RenderObject&) override;
void flowThreadRelativeWillBeRemoved(RenderObject&) override;
void flowThreadDescendantBoxLaidOut(RenderBox*) override;
LogicalExtentComputedValues computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop) const override;
LayoutUnit initialLogicalWidth() const override;
void setPageBreak(const RenderBlock*, LayoutUnit offset, LayoutUnit spaceShortage) override;
void updateMinimumPageHeight(const RenderBlock*, LayoutUnit offset, LayoutUnit minHeight) override;
RenderRegion* regionAtBlockOffset(const RenderBox*, LayoutUnit, bool extendLastRegion = false) const override;
void setRegionRangeForBox(const RenderBox&, RenderRegion*, RenderRegion*) override;
bool addForcedRegionBreak(const RenderBlock*, LayoutUnit, RenderBox* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment = 0) override;
bool isPageLogicalHeightKnown() const override;
void handleSpannerRemoval(RenderObject& spanner);
RenderObject* processPossibleSpannerDescendant(RenderObject*& subtreeRoot, RenderObject& descendant);
private:
typedef HashMap<RenderBox*, RenderMultiColumnSpannerPlaceholder*> SpannerMap;
SpannerMap m_spannerMap;
RenderMultiColumnSet* m_lastSetWorkedOn;
unsigned m_columnCount; LayoutUnit m_columnWidth; LayoutUnit m_columnHeightAvailable; bool m_inLayout; bool m_inBalancingPass; bool m_needsHeightsRecalculation;
bool m_progressionIsInline;
bool m_progressionIsReversed;
bool m_beingEvacuated;
static bool gShiftingSpanner;
};
}
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderMultiColumnFlowThread, isRenderMultiColumnFlowThread())