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 blink { 29 30 class RenderLayer; 31 class ScrollableArea; 32 33 enum LayerType { 34 NoLayer, 35 NormalLayer, 36 // A forced or overflow clip layer is required for bookkeeping purposes, 37 // but does not force a layer to be self painting. 38 OverflowClipLayer, 39 ForcedLayer 40 }; 41 42 class RenderLayerModelObject : public RenderObject { 43 public: 44 explicit RenderLayerModelObject(ContainerNode*); 45 virtual ~RenderLayerModelObject(); 46 47 // This is the only way layers should ever be destroyed. 48 void destroyLayer(); 49 50 bool hasSelfPaintingLayer() const; 51 RenderLayer* layer() const { return m_layer.get(); } 52 ScrollableArea* scrollableArea() const; 53 54 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE; 55 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE; 56 virtual void updateFromStyle() { } 57 58 virtual LayerType layerTypeRequired() const = 0; 59 60 // Returns true if the background is painted opaque in the given rect. 61 // The query rect is given in local coordinate system. 62 virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; } 63 64 // This is null for anonymous renderers. 65 ContainerNode* node() const { return toContainerNode(RenderObject::node()); } 66 67 virtual void invalidateTreeIfNeeded(const PaintInvalidationState&) OVERRIDE; 68 69 // Indicate that the contents of this renderer need to be repainted. Only has an effect if compositing is being used, 70 void setBackingNeedsPaintInvalidationInRect(const LayoutRect&) const; // r is in the coordinate space of this render object 71 72 protected: 73 void createLayer(LayerType); 74 75 virtual void willBeDestroyed() OVERRIDE; 76 77 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer*, const LayoutPoint&, const LayoutRect&) const OVERRIDE; 78 79 private: 80 virtual bool isLayerModelObject() const OVERRIDE FINAL { return true; } 81 82 OwnPtr<RenderLayer> m_layer; 83 84 // Used to store state between styleWillChange and styleDidChange 85 static bool s_wasFloating; 86 }; 87 88 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isLayerModelObject()); 89 90 } // namespace blink 91 92 #endif // RenderLayerModelObject_h 93
