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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.
*/
#ifndef RenderNamedFlowThread_h
#define RenderNamedFlowThread_h
#include "RenderFlowThread.h"
#include "SelectionSubtreeRoot.h"
#include "Timer.h"
#include <wtf/HashCountedSet.h>
#include <wtf/ListHashSet.h>
#include <wtf/text/AtomicString.h>
namespace WebCore {
class Node;
class RenderNamedFlowThread;
class WebKitNamedFlow;
typedef ListHashSet<RenderNamedFlowThread*> RenderNamedFlowThreadList;
typedef HashCountedSet<RenderNamedFlowThread*> RenderNamedFlowThreadCountedSet;
typedef ListHashSet<Element*> NamedFlowContentElements;
class RenderNamedFlowThread final : public RenderFlowThread, public SelectionSubtreeRoot {
public:
RenderNamedFlowThread(Document&, Ref<RenderStyle>&&, Ref<WebKitNamedFlow>&&);
virtual ~RenderNamedFlowThread();
const AtomicString& flowThreadName() const;
const RenderRegionList& invalidRenderRegionList() const { return m_invalidRegionList; }
RenderElement* nextRendererForElement(Element&) const;
void addFlowChild(RenderElement&);
void removeFlowChild(RenderElement&);
bool hasChildren() const { return !m_flowThreadChildList.isEmpty(); }
#ifndef NDEBUG
bool hasChild(RenderElement& child) const { return m_flowThreadChildList.contains(&child); }
#endif
static RenderBlock* fragmentFromRenderBoxAsRenderBlock(RenderBox*, const IntPoint& absolutePoint, const RenderBox& flowedBox);
void pushDependencies(RenderNamedFlowThreadList&);
virtual void addRegionToThread(RenderRegion*) override;
virtual void removeRegionFromThread(RenderRegion*) override;
virtual void regionChangedWritingMode(RenderRegion*) override;
LayoutRect decorationsClipRectForBoxInNamedFlowFragment(const RenderBox&, RenderNamedFlowFragment&) const;
RenderNamedFlowFragment* fragmentFromAbsolutePointAndBox(const IntPoint&, const RenderBox& flowedBox);
void registerNamedFlowContentElement(Element&);
void unregisterNamedFlowContentElement(Element&);
const NamedFlowContentElements& contentElements() const { return m_contentElements; }
bool hasContentElement(Element&) const;
bool isMarkedForDestruction() const;
void getRanges(Vector<RefPtr<Range>>&, const RenderNamedFlowFragment*) const;
virtual void applyBreakAfterContent(LayoutUnit) override;
virtual bool collectsGraphicsLayersUnderRegions() const override;
// Check if the content is flown into at least a region with region styling rules.
bool hasRegionsWithStyling() const { return m_hasRegionsWithStyling; }
void checkRegionsWithStyling();
void clearRenderObjectCustomStyle(const RenderObject*);
virtual void removeFlowChildInfo(RenderObject*) override;
LayoutUnit flowContentBottom() const { return m_flowContentBottom; }
void dispatchNamedFlowEvents();
void setDispatchRegionOversetChangeEvent(bool value) { m_dispatchRegionOversetChangeEvent = value; }
virtual bool absoluteQuadsForBox(Vector<FloatQuad>&, bool*, const RenderBox*, float, float) const override;
protected:
void setMarkForDestruction();
void resetMarkForDestruction();
private:
virtual const char* renderName() const override;
virtual bool isRenderNamedFlowThread() const override { return true; }
virtual bool isChildAllowed(const RenderObject&, const RenderStyle&) const override;
virtual void computeOverflow(LayoutUnit, bool = false) override;
virtual void layout() override;
void dispatchRegionOversetChangeEventIfNeeded();
bool dependsOn(RenderNamedFlowThread* otherRenderFlowThread) const;
void addDependencyOnFlowThread(RenderNamedFlowThread*);
void removeDependencyOnFlowThread(RenderNamedFlowThread*);
void addFragmentToNamedFlowThread(RenderNamedFlowFragment*);
void checkInvalidRegions();
bool canBeDestroyed() const { return m_invalidRegionList.isEmpty() && m_regionList.isEmpty() && m_contentElements.isEmpty(); }
void regionOversetChangeEventTimerFired();
void clearContentElements();
void updateWritingMode();
WebKitNamedFlow& namedFlow() { return m_namedFlow; }
const WebKitNamedFlow& namedFlow() const { return m_namedFlow; }
// 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.
RenderNamedFlowThreadCountedSet 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.
RenderNamedFlowThreadCountedSet m_layoutBeforeThreadsSet;
// Holds the sorted children of a named flow. This is the only way we can get the ordering right.
ListHashSet<RenderElement*> m_flowThreadChildList;
NamedFlowContentElements m_contentElements;
RenderRegionList m_invalidRegionList;
bool m_hasRegionsWithStyling : 1;
bool m_dispatchRegionOversetChangeEvent : 1;
// The DOM Object that represents a named flow.
Ref<WebKitNamedFlow> m_namedFlow;
Timer m_regionOversetChangeEventTimer;
LayoutUnit m_flowContentBottom;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderNamedFlowThread, isRenderNamedFlowThread())
#endif // RenderNamedFlowThread_h
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