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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 blink {
class RenderLayer;
class ScrollableArea;
enum LayerType {
// A forced or overflow clip layer is required for bookkeeping purposes,
// but does not force a layer to be self painting.
class RenderLayerModelObject : public RenderObject {
explicit RenderLayerModelObject(ContainerNode*);
virtual ~RenderLayerModelObject();
// This is the only way layers should ever be destroyed.
void destroyLayer();
bool hasSelfPaintingLayer() const;
RenderLayer* layer() const { return m_layer.get(); }
ScrollableArea* scrollableArea() const;
virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
virtual void updateFromStyle() { }
virtual LayerType layerTypeRequired() 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()); }
virtual void invalidateTreeIfNeeded(const PaintInvalidationState&) override;
// Indicate that the contents of this renderer need to be repainted. Only has an effect if compositing is being used,
void setBackingNeedsPaintInvalidationInRect(const LayoutRect&, PaintInvalidationReason) const; // r is in the coordinate space of this render object
void createLayer(LayerType);
virtual void willBeDestroyed() override;
virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer*, const LayoutPoint&, const LayoutRect&) const override;
virtual bool isLayerModelObject() const override final { return true; }
OwnPtr<RenderLayer> m_layer;
// Used to store state between styleWillChange and styleDidChange
static bool s_wasFloating;
DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isLayerModelObject());
} // namespace blink
#endif // RenderLayerModelObject_h