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/*
* Copyright 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 RenderFlowThread_h
#define RenderFlowThread_h
#include "RenderBlock.h"
#include <wtf/HashCountedSet.h>
#include <wtf/ListHashSet.h>
#include <wtf/PassRefPtr.h>
#include <wtf/UnusedParam.h>
#include <wtf/text/AtomicString.h>
namespace WebCore {
class RenderFlowThread;
class RenderStyle;
class RenderRegion;
class WebKitNamedFlow;
typedef ListHashSet<RenderFlowThread*> RenderFlowThreadList;
typedef HashCountedSet<RenderFlowThread*> RenderFlowThreadCountedSet;
typedef ListHashSet<RenderRegion*> RenderRegionList;
// RenderFlowThread is used to collect all the render objects that participate in a
// flow thread. It will also help in doing the layout. However, it will not render
// directly to screen. Instead, RenderRegion objects will redirect their paint
// and nodeAtPoint methods to this object. Each RenderRegion will actually be a viewPort
// of the RenderFlowThread.
class RenderFlowThread: public RenderBlock {
public:
RenderFlowThread(Node*, const AtomicString& flowThread);
virtual bool isRenderFlowThread() const { return true; }
virtual void layout();
AtomicString flowThread() const { return m_flowThread; }
// Always create a RenderLayer for the RenderFlowThread, so that we
// can easily avoid to draw it's children directly.
virtual bool requiresLayer() const { return true; }
RenderObject* nextRendererForNode(Node*) const;
RenderObject* previousRendererForNode(Node*) const;
void addFlowChild(RenderObject* newChild, RenderObject* beforeChild = 0);
void removeFlowChild(RenderObject*);
void removeFlowChildInfo(RenderObject*);
bool hasChildren() const { return !m_flowThreadChildList.isEmpty(); }
#ifndef NDEBUG
bool hasChild(RenderObject* child) const { return m_flowThreadChildList.contains(child); }
bool hasChildInfo(RenderObject* child) const { return child && child->isBox() && m_regionRangeMap.contains(toRenderBox(child)); }
#endif
void addRegionToThread(RenderRegion*);
void removeRegionFromThread(RenderRegion*);
const RenderRegionList& renderRegionList() const { return m_regionList; }
void computeLogicalWidth();
void computeLogicalHeight();
void paintIntoRegion(PaintInfo&, RenderRegion*, const LayoutPoint& paintOffset);
bool hitTestRegion(RenderRegion*, const HitTestRequest&, HitTestResult&, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset);
bool hasRegions() const { return m_regionList.size(); }
bool hasValidRegions() const { ASSERT(!m_regionsInvalidated); return m_hasValidRegions; }
void invalidateRegions() { m_regionsInvalidated = true; setNeedsLayout(true); }
bool hasValidRegionInfo() const { return !m_regionsInvalidated && hasValidRegions(); }
static PassRefPtr<RenderStyle> createFlowThreadStyle(RenderStyle* parentStyle);
void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
void pushDependencies(RenderFlowThreadList&);
void repaintRectangleInRegions(const LayoutRect&, bool immediate);
LayoutUnit regionLogicalTopForLine(LayoutUnit position) const;
LayoutUnit regionLogicalWidthForLine(LayoutUnit position) const;
LayoutUnit regionLogicalHeightForLine(LayoutUnit position) const;
LayoutUnit regionRemainingLogicalHeightForLine(LayoutUnit position, PageBoundaryRule = IncludePageBoundary) const;
RenderRegion* renderRegionForLine(LayoutUnit position, bool extendLastRegion = false) const;
bool regionsHaveUniformLogicalWidth() const { return m_regionsHaveUniformLogicalWidth; }
bool regionsHaveUniformLogicalHeight() const { return m_regionsHaveUniformLogicalHeight; }
RenderRegion* mapFromFlowToRegion(TransformState&) const;
void removeRenderBoxRegionInfo(RenderBox*);
bool logicalWidthChangedInRegions(const RenderBlock*, LayoutUnit offsetFromLogicalTopOfFirstPage);
LayoutUnit contentLogicalWidthOfFirstRegion() const;
LayoutUnit contentLogicalHeightOfFirstRegion() const;
LayoutUnit contentLogicalLeftOfFirstRegion() const;
RenderRegion* firstRegion() const;
RenderRegion* lastRegion() const;
void setRegionRangeForBox(const RenderBox*, LayoutUnit offsetFromLogicalTopOfFirstPage);
void getRegionRangeForBox(const RenderBox*, RenderRegion*& startRegion, RenderRegion*& endRegion) const;
void clearRenderBoxCustomStyle(const RenderBox*,
const RenderRegion* oldStartRegion = 0, const RenderRegion* oldEndRegion = 0,
const RenderRegion* newStartRegion = 0, const RenderRegion* newEndRegion = 0);
WebKitNamedFlow* ensureNamedFlow();
void computeOverflowStateForRegions(LayoutUnit oldClientAfterEdge);
bool overflow() const { return m_overflow; }
private:
virtual const char* renderName() const { return "RenderFlowThread"; }
bool dependsOn(RenderFlowThread* otherRenderFlowThread) const;
void addDependencyOnFlowThread(RenderFlowThread*);
void removeDependencyOnFlowThread(RenderFlowThread*);
void checkInvalidRegions();
bool shouldRepaint(const LayoutRect&) const;
typedef ListHashSet<RenderObject*> FlowThreadChildList;
FlowThreadChildList m_flowThreadChildList;
AtomicString m_flowThread;
RenderRegionList m_regionList;
class RenderRegionRange {
public:
RenderRegionRange()
{
setRange(0, 0);
}
RenderRegionRange(RenderRegion* start, RenderRegion* end)
{
setRange(start, end);
}
void setRange(RenderRegion* start, RenderRegion* end)
{
m_startRegion = start;
m_endRegion = end;
}
RenderRegion* startRegion() const { return m_startRegion; }
RenderRegion* endRegion() const { return m_endRegion; }
private:
RenderRegion* m_startRegion;
RenderRegion* m_endRegion;
};
// Observer flow threads have invalid regions that depend on the state of this thread
// to re-validate their regions. Keeping a set of observer threads make it easy
// to notify them when a region was removed from this flow.
RenderFlowThreadCountedSet m_observerThreadsSet;
// Some threads need to have a complete layout before we layout this flow.
// That's because they contain a RenderRegion that should display this thread. The set makes it
// easy to sort the order of threads layout.
RenderFlowThreadCountedSet m_layoutBeforeThreadsSet;
// A maps from RenderBox
typedef HashMap<const RenderBox*, RenderRegionRange> RenderRegionRangeMap;
RenderRegionRangeMap m_regionRangeMap;
bool m_hasValidRegions;
bool m_regionsInvalidated;
bool m_regionsHaveUniformLogicalWidth;
bool m_regionsHaveUniformLogicalHeight;
bool m_overflow;
RefPtr<WebKitNamedFlow> m_namedFlow;
};
inline RenderFlowThread* toRenderFlowThread(RenderObject* object)
{
ASSERT(!object || object->isRenderFlowThread());
return static_cast<RenderFlowThread*>(object);
}
inline const RenderFlowThread* toRenderFlowThread(const RenderObject* object)
{
ASSERT(!object || object->isRenderFlowThread());
return static_cast<const RenderFlowThread*>(object);
}
// This will catch anyone doing an unnecessary cast.
void toRenderFlowThread(const RenderFlowThread*);
} // namespace WebCore
#endif // RenderFlowThread_h
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