1 /* 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. 6 * 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. 11 * 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. 16 * 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. 21 */ 22 23 #ifndef RenderLayerModelObject_h 24 #define RenderLayerModelObject_h 25 26 #include "core/rendering/compositing/CompositedLayerMappingPtr.h" 27 #include "core/rendering/RenderObject.h" 28 29 namespace WebCore { 30 31 class RenderLayer; 32 class CompositedLayerMapping; 33 class ScrollableArea; 34 35 enum LayerType { 36 NoLayer, 37 NormalLayer, 38 // A forced or overflow clip layer is required for bookkeeping purposes, 39 // but does not force a layer to be self painting. 40 OverflowClipLayer, 41 ForcedLayer 42 }; 43 44 class RenderLayerModelObject : public RenderObject { 45 public: 46 explicit RenderLayerModelObject(ContainerNode*); 47 virtual ~RenderLayerModelObject(); 48 49 // This is the only way layers should ever be destroyed. 50 void destroyLayer(); 51 52 bool hasSelfPaintingLayer() const; layer()53 RenderLayer* layer() const { return m_layer.get(); } 54 ScrollableArea* scrollableArea() const; 55 56 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE; 57 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE; updateFromStyle()58 virtual void updateFromStyle() { } 59 60 virtual LayerType layerTypeRequired() const = 0; 61 62 // Returns true if the background is painted opaque in the given rect. 63 // The query rect is given in local coordinate system. backgroundIsKnownToBeOpaqueInRect(const LayoutRect &)64 virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; } 65 66 // This is null for anonymous renderers. node()67 ContainerNode* node() const { return toContainerNode(RenderObject::node()); } 68 69 CompositedLayerMappingPtr compositedLayerMapping() const; 70 bool hasCompositedLayerMapping() const; 71 CompositedLayerMapping* groupedMapping() const; 72 73 protected: 74 void createLayer(LayerType); 75 76 virtual void willBeDestroyed() OVERRIDE; 77 78 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer*, const LayoutPoint&, const LayoutRect&) const OVERRIDE; 79 80 private: isLayerModelObject()81 virtual bool isLayerModelObject() const OVERRIDE FINAL { return true; } 82 83 OwnPtr<RenderLayer> m_layer; 84 85 // Used to store state between styleWillChange and styleDidChange 86 static bool s_wasFloating; 87 }; 88 89 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isLayerModelObject()); 90 91 } // namespace WebCore 92 93 #endif // RenderLayerModelObject_h 94