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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 COMPUTER, 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.
*/
#ifndef RenderMultiColumnFlowThread_h
#define RenderMultiColumnFlowThread_h
#include "RenderFlowThread.h"
namespace WebCore {
class RenderMultiColumnFlowThread final : public RenderFlowThread {
public:
RenderMultiColumnFlowThread(Document&, PassRef<RenderStyle>);
~RenderMultiColumnFlowThread();
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 needsRebalancing() const { return m_needsRebalancing; }
void setNeedsRebalancing(bool balancing) { m_needsRebalancing = balancing; }
bool shouldRelayoutForPagination() const { return !m_inBalancingPass && m_needsRebalancing; }
bool requiresBalancing() const { return progressionIsInline() && (!columnHeightAvailable() || parent()->style().columnFill() == ColumnFillBalance); }
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; }
private:
virtual const char* renderName() const override;
virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
virtual void autoGenerateRegionsToBlockOffset(LayoutUnit) override;
virtual LayoutUnit initialLogicalWidth() const override;
virtual void setPageBreak(const RenderBlock*, LayoutUnit offset, LayoutUnit spaceShortage) override;
virtual void updateMinimumPageHeight(const RenderBlock*, LayoutUnit offset, LayoutUnit minHeight) override;
virtual bool addForcedRegionBreak(const RenderBlock*, LayoutUnit, RenderBox* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment = 0) override;
private:
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 regions 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_inBalancingPass; // Guard to avoid re-entering column balancing.
bool m_needsRebalancing;
bool m_progressionIsInline;
bool m_progressionIsReversed;
};
} // namespace WebCore
#endif // RenderMultiColumnFlowThread_h
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