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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "RenderFragmentedFlow.h"
#include <wtf/HashMap.h>
namespace WebCore {
class RenderMultiColumnSet;
class RenderMultiColumnSpannerPlaceholder;
class RenderMultiColumnFlow final : public RenderFragmentedFlow {
WTF_MAKE_ISO_ALLOCATED(RenderMultiColumnFlow);
public:
RenderMultiColumnFlow(Document&, RenderStyle&&);
~RenderMultiColumnFlow();
RenderBlockFlow* multiColumnBlockFlow() const { return downcast<RenderBlockFlow>(parent()); }
RenderMultiColumnSet* firstMultiColumnSet() const;
RenderMultiColumnSet* lastMultiColumnSet() const;
RenderBox* firstColumnSetOrSpanner() const;
bool hasColumnSpanner() const { return !m_spannerMap->isEmpty(); }
static RenderBox* nextColumnSetOrSpannerSiblingOf(const RenderBox*);
static RenderBox* previousColumnSetOrSpannerSiblingOf(const RenderBox*);
RenderMultiColumnSpannerPlaceholder* findColumnSpannerPlaceholder(RenderBox* spanner) const { return m_spannerMap->get(spanner).get(); }
void layout() override;
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; }
RenderFragmentContainer* mapFromFlowToFragment(TransformState&) const override;
// This method takes a logical offset and returns a physical translation that can be applied to map
// a physical point (corresponding to the logical offset) into the fragment's physical coordinate space.
LayoutSize physicalTranslationOffsetFromFlowToFragment(const RenderFragmentContainer*, const LayoutUnit) const;
// The point is physical, and the result is a physical location within the fragment.
RenderFragmentContainer* physicalTranslationFromFlowToFragment(LayoutPoint&) const;
// This method is the inverse of the previous method and goes from fragment to flow.
LayoutSize physicalTranslationFromFragmentToFlow(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;
// FIXME: Eventually as column and fragment flow threads start nesting, this will end up changing.
bool shouldCheckColumnBreaks() const override;
typedef HashMap<RenderBox*, WeakPtr<RenderMultiColumnSpannerPlaceholder>> SpannerMap;
SpannerMap& spannerMap() { return *m_spannerMap; }
private:
bool isRenderMultiColumnFlow() const override { return true; }
const char* renderName() const override;
void addFragmentToThread(RenderFragmentContainer*) override;
void willBeRemovedFromTree() override;
void fragmentedFlowDescendantBoxLaidOut(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;
RenderFragmentContainer* fragmentAtBlockOffset(const RenderBox*, LayoutUnit, bool extendLastFragment = false) const override;
void setFragmentRangeForBox(const RenderBox&, RenderFragmentContainer*, RenderFragmentContainer*) override;
bool addForcedFragmentBreak(const RenderBlock*, LayoutUnit, RenderBox* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment = 0) override;
bool isPageLogicalHeightKnown() const override;
private:
std::unique_ptr<SpannerMap> m_spannerMap;
// The last set we worked on. It's not to be used as the "current set". The concept of a
// "current set" is difficult, since layout may jump back and forth in the tree, due to wrong
// top location estimates (due to e.g. margin collapsing), and possibly for other reasons.
RenderMultiColumnSet* m_lastSetWorkedOn;
unsigned m_columnCount; // The default column count/width that are based off our containing block width. These values represent only the default,
LayoutUnit m_columnWidth; // A multi-column block that is split across variable width pages or fragments will have different column counts and widths in each. These values will be cached (eventually) for multi-column blocks.
LayoutUnit m_columnHeightAvailable; // Total height available to columns, or 0 if auto.
bool m_inLayout; // Set while we're laying out the flow thread, during which colum set heights are unknown.
bool m_inBalancingPass; // Guard to avoid re-entering column balancing.
bool m_needsHeightsRecalculation;
bool m_progressionIsInline;
bool m_progressionIsReversed;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderMultiColumnFlow, isRenderMultiColumnFlow())