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 "RenderElement.h" 27 28namespace WebCore { 29 30class RenderLayer; 31 32class RenderLayerModelObject : public RenderElement { 33public: 34 virtual ~RenderLayerModelObject(); 35 36 // Called by RenderObject::willBeDestroyed() and is the only way layers should ever be destroyed 37 void destroyLayer(); 38 39 bool hasSelfPaintingLayer() const; 40 RenderLayer* layer() const { return m_layer.get(); } 41 42 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override; 43 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override; 44 virtual void updateFromStyle() { } 45 46 virtual bool requiresLayer() const = 0; 47 48 // Returns true if the background is painted opaque in the given rect. 49 // The query rect is given in local coordinate system. 50 virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; } 51 52protected: 53 RenderLayerModelObject(Element&, PassRef<RenderStyle>, unsigned baseTypeFlags); 54 RenderLayerModelObject(Document&, PassRef<RenderStyle>, unsigned baseTypeFlags); 55 56 void createLayer(); 57 58 virtual void willBeDestroyed() override; 59 60private: 61 std::unique_ptr<RenderLayer> m_layer; 62 63 // Used to store state between styleWillChange and styleDidChange 64 static bool s_wasFloating; 65 static bool s_hadLayer; 66 static bool s_hadTransform; 67 static bool s_layerWasSelfPainting; 68}; 69 70RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isRenderLayerModelObject()) 71 72} // namespace WebCore 73 74#endif // RenderLayerModelObject_h 75