2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
5 * Copyright (C) 2010, 2012 Google Inc. All rights reserved.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
23 #ifndef RenderLayerModelObject_h
24 #define RenderLayerModelObject_h
26 #include "core/rendering/CompositedLayerMappingPtr.h"
27 #include "core/rendering/RenderObject.h"
32 class CompositedLayerMapping;
38 // A forced or overflow clip layer is required for bookkeeping purposes,
39 // but does not force a layer to be self painting.
44 class RenderLayerModelObject : public RenderObject {
46 explicit RenderLayerModelObject(ContainerNode*);
47 virtual ~RenderLayerModelObject();
49 // This is the only way layers should ever be destroyed.
52 bool hasSelfPaintingLayer() const;
53 RenderLayer* layer() const { return m_layer.get(); }
54 ScrollableArea* scrollableArea() const;
56 virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE;
57 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
58 virtual void updateFromStyle() { }
60 virtual LayerType layerTypeRequired() const = 0;
62 // Returns true if the background is painted opaque in the given rect.
63 // The query rect is given in local coordinate system.
64 virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; }
66 // This is null for anonymous renderers.
67 ContainerNode* node() const { return toContainerNode(RenderObject::node()); }
69 CompositedLayerMappingPtr compositedLayerMapping() const;
70 bool hasCompositedLayerMapping() const;
71 CompositedLayerMapping* groupedMapping() const;
74 void createLayer(LayerType);
76 virtual void willBeDestroyed() OVERRIDE;
78 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer*, const LayoutPoint&, const LayoutRect&) const OVERRIDE;
81 virtual bool isLayerModelObject() const OVERRIDE FINAL { return true; }
83 OwnPtr<RenderLayer> m_layer;
85 // Used to store state between styleWillChange and styleDidChange
86 static bool s_wasFloating;
89 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isLayerModelObject());
91 } // namespace WebCore
93 #endif // RenderLayerModelObject_h