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* Copyright (C) 1999 Lars Knoll (
* (C) 1999 Antti Koivisto (
* Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2010, 2012 Google Inc. All rights reserved.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#ifndef RenderLayerModelObject_h
#define RenderLayerModelObject_h
#include "core/rendering/RenderObject.h"
namespace WebCore {
class RenderLayer;
class CompositedLayerMapping;
class ScrollableArea;
class RenderLayerModelObject : public RenderObject {
explicit RenderLayerModelObject(ContainerNode*);
virtual ~RenderLayerModelObject();
// Called by RenderObject::willBeDestroyed() and is the only way layers should ever be destroyed
void destroyLayer();
bool hasSelfPaintingLayer() const;
RenderLayer* layer() const { return m_layer; }
ScrollableArea* scrollableArea() const;
virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE;
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
virtual void updateFromStyle() { }
virtual bool requiresLayer() const = 0;
// Returns true if the background is painted opaque in the given rect.
// The query rect is given in local coordinate system.
virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; }
// This is null for anonymous renderers.
ContainerNode* node() const { return toContainerNode(RenderObject::node()); }
CompositedLayerMapping* compositedLayerMapping() const;
void createLayer();
virtual void willBeDestroyed() OVERRIDE;
virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer*, const LayoutPoint&, const LayoutRect&) const OVERRIDE;
virtual bool isLayerModelObject() const OVERRIDE FINAL { return true; }
RenderLayer* m_layer;
// Used to store state between styleWillChange and styleDidChange
static bool s_wasFloating;
static bool s_hadLayer;
static bool s_hadTransform;
static bool s_layerWasSelfPainting;
DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isLayerModelObject());
} // namespace WebCore
#endif // RenderLayerModelObject_h