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/*
* Copyright (C) 2011 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER “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 THE COPYRIGHT HOLDER 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 RenderRegion_h
#define RenderRegion_h
#include "RenderReplaced.h"
namespace WebCore {
class RenderBox;
class RenderBoxRegionInfo;
class RenderFlowThread;
class RenderNamedFlowThread;
class RenderRegion : public RenderReplaced {
public:
explicit RenderRegion(Node*, RenderFlowThread*);
virtual bool isRenderRegion() const { return true; }
virtual void paintReplaced(PaintInfo&, const LayoutPoint&);
virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestPoint& pointInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
void setRegionRect(const LayoutRect& rect) { m_regionRect = rect; }
LayoutRect regionRect() const { return m_regionRect; }
LayoutRect regionOversetRect() const;
void attachRegion();
void detachRegion();
RenderNamedFlowThread* parentNamedFlowThread() const { return m_parentNamedFlowThread; }
RenderFlowThread* flowThread() const { return m_flowThread; }
// Valid regions do not create circular dependencies with other flows.
bool isValid() const { return m_isValid; }
void setIsValid(bool valid) { m_isValid = valid; }
bool hasCustomRegionStyle() const { return m_hasCustomRegionStyle; }
void setHasCustomRegionStyle(bool hasCustomRegionStyle) { m_hasCustomRegionStyle = hasCustomRegionStyle; }
virtual void layout();
RenderBoxRegionInfo* renderBoxRegionInfo(const RenderBox*) const;
RenderBoxRegionInfo* setRenderBoxRegionInfo(const RenderBox*, LayoutUnit logicalLeftInset, LayoutUnit logicalRightInset,
bool containingBlockChainIsInset);
PassOwnPtr<RenderBoxRegionInfo> takeRenderBoxRegionInfo(const RenderBox*);
void removeRenderBoxRegionInfo(const RenderBox*);
void deleteAllRenderBoxRegionInfo();
LayoutUnit offsetFromLogicalTopOfFirstPage() const;
bool isFirstRegion() const;
bool isLastRegion() const;
void clearObjectStyleInRegion(const RenderObject*);
enum RegionState {
RegionUndefined,
RegionEmpty,
RegionFit,
RegionOverset
};
RegionState regionState() const { return isValid() ? m_regionState : RegionUndefined; }
void setRegionState(RegionState regionState) { m_regionState = regionState; }
virtual LayoutUnit logicalWidthForFlowThreadContent() const;
virtual LayoutUnit logicalHeightForFlowThreadContent() const;
protected:
void setRegionObjectsRegionStyle();
void restoreRegionObjectsOriginalStyle();
private:
virtual const char* renderName() const { return "RenderRegion"; }
virtual void insertedIntoTree() OVERRIDE;
virtual void willBeRemovedFromTree() OVERRIDE;
virtual void installFlowThread();
PassRefPtr<RenderStyle> computeStyleInRegion(const RenderObject*);
void computeChildrenStyleInRegion(const RenderObject*);
void setObjectStyleInRegion(RenderObject*, PassRefPtr<RenderStyle>, bool objectRegionStyleCached);
void printRegionObjectsStyles();
void checkRegionStyle();
protected:
RenderFlowThread* m_flowThread;
private:
// If this RenderRegion is displayed as part of another named flow,
// we need to create a dependency tree, so that layout of the
// regions is always done before the regions themselves.
RenderNamedFlowThread* m_parentNamedFlowThread;
LayoutRect m_regionRect;
// This map holds unique information about a block that is split across regions.
// A RenderBoxRegionInfo* tells us about any layout information for a RenderBox that
// is unique to the region. For now it just holds logical width information for RenderBlocks, but eventually
// it will also hold a custom style for any box (for region styling).
typedef HashMap<const RenderBox*, OwnPtr<RenderBoxRegionInfo> > RenderBoxRegionInfoMap;
RenderBoxRegionInfoMap m_renderBoxRegionInfo;
struct ObjectRegionStyleInfo {
// Used to store the original style of the object in region
// so that the original style is properly restored after paint.
// Also used to store computed style of the object in region between
// region paintings, so that the style in region is computed only
// when necessary.
RefPtr<RenderStyle> style;
// True if the computed style in region is cached.
bool cached;
};
typedef HashMap<const RenderObject*, ObjectRegionStyleInfo > RenderObjectRegionStyleMap;
RenderObjectRegionStyleMap m_renderObjectRegionStyle;
bool m_isValid;
bool m_hasCustomRegionStyle;
RegionState m_regionState;
};
inline RenderRegion* toRenderRegion(RenderObject* object)
{
ASSERT(!object || object->isRenderRegion());
return static_cast<RenderRegion*>(object);
}
inline const RenderRegion* toRenderRegion(const RenderObject* object)
{
ASSERT(!object || object->isRenderRegion());
return static_cast<const RenderRegion*>(object);
}
// This will catch anyone doing an unnecessary cast.
void toRenderRegion(const RenderRegion*);
} // namespace WebCore
#endif // RenderRegion_h
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