1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 1999 Antti Koivisto (koivisto (at) 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/RenderObject.h" 27 28 namespace WebCore { 29 30 class RenderLayer; 31 32 class RenderLayerModelObject : public RenderObject { 33 public: 34 explicit RenderLayerModelObject(ContainerNode*); 35 virtual ~RenderLayerModelObject(); 36 37 // Called by RenderObject::willBeDestroyed() and is the only way layers should ever be destroyed 38 void destroyLayer(); 39 40 bool hasSelfPaintingLayer() const; 41 RenderLayer* layer() const { return m_layer; } 42 43 virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE; 44 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE; 45 virtual void updateFromStyle() { } 46 47 virtual bool requiresLayer() const = 0; 48 49 // Returns true if the background is painted opaque in the given rect. 50 // The query rect is given in local coordinate system. 51 virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; } 52 53 // This is null for anonymous renderers. 54 ContainerNode* node() const { return toContainerNode(RenderObject::node()); } 55 56 protected: 57 void ensureLayer(); 58 59 virtual void willBeDestroyed() OVERRIDE; 60 61 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer*, const LayoutPoint&, const LayoutRect&) const OVERRIDE; 62 63 private: 64 virtual bool isLayerModelObject() const OVERRIDE FINAL { return true; } 65 66 RenderLayer* m_layer; 67 68 // Used to store state between styleWillChange and styleDidChange 69 static bool s_wasFloating; 70 static bool s_hadLayer; 71 static bool s_hadTransform; 72 static bool s_layerWasSelfPainting; 73 }; 74 75 inline RenderLayerModelObject* toRenderLayerModelObject(RenderObject* object) 76 { 77 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isLayerModelObject()); 78 return static_cast<RenderLayerModelObject*>(object); 79 } 80 81 inline const RenderLayerModelObject* toRenderLayerModelObject(const RenderObject* object) 82 { 83 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isLayerModelObject()); 84 return static_cast<const RenderLayerModelObject*>(object); 85 } 86 87 // This will catch anyone doing an unnecessary cast. 88 void toRenderLayerModelObject(const RenderLayerModelObject*); 89 90 } // namespace WebCore 91 92 #endif // RenderLayerModelObject_h 93
