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/*
* Copyright (C) 2013 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 RenderNamedFlowFragment_h
#define RenderNamedFlowFragment_h
#include "RenderRegion.h"
namespace WebCore {
class Element;
class RenderStyle;
// RenderNamedFlowFragment represents a region that is responsible for the fragmentation of
// the RenderNamedFlowThread content.
//
// A RenderNamedFlowFragment object is created as an anonymous child for a RenderBlockFlow object
// that has a valid -webkit-flow-from property.
//
// This allows a non-replaced block to behave like a region if needed, following the CSSRegions specification:
// http://dev.w3.org/csswg/css-regions/#the-flow-from-property.
// list-item, table-caption, table-cell can become regions in addition to block | inline-block.
class RenderNamedFlowFragment final : public RenderRegion {
public:
RenderNamedFlowFragment(Document&, PassRef<RenderStyle>);
virtual ~RenderNamedFlowFragment();
static PassRef<RenderStyle> createStyle(const RenderStyle& parentStyle);
virtual bool isRenderNamedFlowFragment() const override final { return true; }
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
virtual LayoutUnit pageLogicalHeight() const;
LayoutUnit maxPageLogicalHeight() const;
bool isPseudoElementRegion() const { return parent() && parent()->isPseudoElement(); }
// When the content inside the region requires the region to have a layer, the layer will be created on the region's
// parent renderer instead.
// This method returns that renderer holding the layer.
// The return value cannot be null because CSS Regions create Stacking Contexts (which means they create layers).
RenderLayerModelObject& layerOwner() const { return *toRenderLayerModelObject(parent()); }
bool hasCustomRegionStyle() const { return m_hasCustomRegionStyle; }
void setHasCustomRegionStyle(bool hasCustomRegionStyle) { m_hasCustomRegionStyle = hasCustomRegionStyle; }
void clearObjectStyleInRegion(const RenderObject*);
void setRegionObjectsRegionStyle();
void restoreRegionObjectsOriginalStyle();
virtual LayoutRect visualOverflowRect() const override;
RenderNamedFlowThread* namedFlowThread() const;
virtual bool hasAutoLogicalHeight() const override { return m_hasAutoLogicalHeight; }
LayoutUnit computedAutoHeight() const { return m_computedAutoHeight; }
void setComputedAutoHeight(LayoutUnit computedAutoHeight)
{
m_hasComputedAutoHeight = true;
m_computedAutoHeight = computedAutoHeight;
}
void clearComputedAutoHeight()
{
m_hasComputedAutoHeight = false;
m_computedAutoHeight = 0;
}
bool hasComputedAutoHeight() const { return m_hasComputedAutoHeight; }
virtual void attachRegion() override;
virtual void detachRegion() override;
virtual void updateLogicalHeight() override;
// FIXME: Temporarily public until we move all the CSSRegions functionality from RenderRegion to here.
public:
void checkRegionStyle();
private:
virtual const char* renderName() const override { return "RenderNamedFlowFragment"; }
PassRefPtr<RenderStyle> computeStyleInRegion(const RenderObject*);
void computeChildrenStyleInRegion(const RenderElement*);
void setObjectStyleInRegion(RenderObject*, PassRefPtr<RenderStyle>, bool objectRegionStyleCached);
void updateRegionHasAutoLogicalHeightFlag();
void incrementAutoLogicalHeightCount();
void decrementAutoLogicalHeightCount();
bool shouldHaveAutoLogicalHeight() const;
virtual void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0) override;
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_hasCustomRegionStyle : 1;
bool m_hasAutoLogicalHeight : 1;
bool m_hasComputedAutoHeight : 1;
LayoutUnit m_computedAutoHeight;
};
RENDER_OBJECT_TYPE_CASTS(RenderNamedFlowFragment, isRenderNamedFlowFragment())
} // namespace WebCore
#endif // RenderNamedFlowFragment_h
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