RenderMultiColumnSet.h [plain text]
#ifndef RenderMultiColumnSet_h
#define RenderMultiColumnSet_h
#include "RenderRegionSet.h"
namespace WebCore {
class RenderMultiColumnSet : public RenderRegionSet {
public:
static RenderMultiColumnSet* createAnonymous(RenderFlowThread*);
virtual bool isRenderMultiColumnSet() const OVERRIDE { return true; }
unsigned computedColumnCount() const { return m_computedColumnCount; }
LayoutUnit computedColumnWidth() const { return m_computedColumnWidth; }
LayoutUnit computedColumnHeight() const { return m_computedColumnHeight; }
void setComputedColumnWidthAndCount(LayoutUnit width, unsigned count)
{
m_computedColumnWidth = width;
m_computedColumnCount = count;
}
LayoutUnit heightAdjustedForSetOffset(LayoutUnit height) const;
void updateMinimumColumnHeight(LayoutUnit height) { m_minimumColumnHeight = std::max(height, m_minimumColumnHeight); }
LayoutUnit minimumColumnHeight() const { return m_minimumColumnHeight; }
unsigned forcedBreaksCount() const { return m_forcedBreaksCount; }
LayoutUnit forcedBreakOffset() const { return m_forcedBreakOffset; }
LayoutUnit maximumDistanceBetweenForcedBreaks() const { return m_maximumDistanceBetweenForcedBreaks; }
void clearForcedBreaks()
{
m_forcedBreaksCount = 0;
m_maximumDistanceBetweenForcedBreaks = 0;
m_forcedBreakOffset = 0;
}
void addForcedBreak(LayoutUnit offsetFromFirstPage)
{
ASSERT(!computedColumnHeight());
LayoutUnit distanceFromLastBreak = offsetFromFirstPage - m_forcedBreakOffset;
if (!distanceFromLastBreak)
return;
m_forcedBreaksCount++;
m_maximumDistanceBetweenForcedBreaks = std::max(m_maximumDistanceBetweenForcedBreaks, distanceFromLastBreak);
m_forcedBreakOffset = offsetFromFirstPage;
}
bool calculateBalancedHeight(bool initial);
void recordSpaceShortage(LayoutUnit spaceShortage);
virtual void updateLogicalWidth() OVERRIDE;
void prepareForLayout();
private:
RenderMultiColumnSet(RenderFlowThread*);
virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
virtual void paintObject(PaintInfo&, const LayoutPoint& paintOffset) OVERRIDE;
virtual LayoutUnit pageLogicalWidth() const OVERRIDE { return m_computedColumnWidth; }
virtual LayoutUnit pageLogicalHeight() const OVERRIDE { return m_computedColumnHeight; }
virtual LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const OVERRIDE;
virtual LayoutUnit logicalHeightOfAllFlowThreadContent() const OVERRIDE { return m_computedColumnHeight; }
virtual bool shouldHaveAutoLogicalHeight() const OVERRIDE { return false; }
virtual void repaintFlowThreadContent(const LayoutRect& repaintRect, bool immediate) const OVERRIDE;
virtual void collectLayerFragments(LayerFragments&, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) OVERRIDE;
virtual const char* renderName() const;
void paintColumnRules(PaintInfo&, const LayoutPoint& paintOffset);
LayoutUnit columnGap() const;
LayoutRect columnRectAt(unsigned index) const;
unsigned columnCount() const;
LayoutRect flowThreadPortionRectAt(unsigned index) const;
LayoutRect flowThreadPortionOverflowRect(const LayoutRect& flowThreadPortion, unsigned index, unsigned colCount, LayoutUnit colGap) const;
enum ColumnIndexCalculationMode {
ClampToExistingColumns, AssumeNewColumns };
unsigned columnIndexAtOffset(LayoutUnit, ColumnIndexCalculationMode = ClampToExistingColumns) const;
void setAndConstrainColumnHeight(LayoutUnit);
unsigned m_computedColumnCount;
LayoutUnit m_computedColumnWidth;
LayoutUnit m_computedColumnHeight;
LayoutUnit m_maxColumnHeight; LayoutUnit m_minSpaceShortage; LayoutUnit m_minimumColumnHeight;
unsigned m_forcedBreaksCount; LayoutUnit m_maximumDistanceBetweenForcedBreaks;
LayoutUnit m_forcedBreakOffset;
};
inline RenderMultiColumnSet* toRenderMultiColumnSet(RenderObject* object)
{
ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderMultiColumnSet());
return static_cast<RenderMultiColumnSet*>(object);
}
inline const RenderMultiColumnSet* toRenderMultiColumnSet(const RenderObject* object)
{
ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderMultiColumnSet());
return static_cast<const RenderMultiColumnSet*>(object);
}
void toRenderMultiColumnSet(const RenderMultiColumnSet*);
}
#endif // RenderMultiColumnSet_h