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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #ifndef RenderWidget_h
     23 #define RenderWidget_h
     24 
     25 #include "OverlapTestRequestClient.h"
     26 #include "RenderReplaced.h"
     27 
     28 namespace WebCore {
     29 
     30 class Widget;
     31 
     32 class RenderWidget : public RenderReplaced, private OverlapTestRequestClient {
     33 public:
     34     virtual ~RenderWidget();
     35 
     36     Widget* widget() const { return m_widget.get(); }
     37     virtual void setWidget(PassRefPtr<Widget>);
     38 
     39     static RenderWidget* find(const Widget*);
     40 
     41     void updateWidgetPosition();
     42 
     43     void showSubstituteImage(PassRefPtr<Image>);
     44 
     45     static void suspendWidgetHierarchyUpdates();
     46     static void resumeWidgetHierarchyUpdates();
     47 
     48 protected:
     49     RenderWidget(Node*);
     50 
     51     FrameView* frameView() const { return m_frameView; }
     52 
     53     void clearWidget();
     54 
     55     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     56     virtual void layout();
     57 
     58 private:
     59     virtual bool isWidget() const { return true; }
     60 
     61     virtual void paint(PaintInfo&, int x, int y);
     62     virtual void destroy();
     63     virtual void setSelectionState(SelectionState);
     64     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
     65     virtual void setOverlapTestResult(bool);
     66 
     67     bool setWidgetGeometry(const IntRect&);
     68 
     69     friend class RenderWidgetProtector;
     70     RenderArena* ref() { ++m_refCount; return renderArena(); }
     71     void deref(RenderArena*);
     72 
     73     RefPtr<Widget> m_widget;
     74     RefPtr<Image> m_substituteImage;
     75     FrameView* m_frameView;
     76     int m_refCount;
     77 };
     78 
     79 inline RenderWidget* toRenderWidget(RenderObject* object)
     80 {
     81     ASSERT(!object || object->isWidget());
     82     return static_cast<RenderWidget*>(object);
     83 }
     84 
     85 inline const RenderWidget* toRenderWidget(const RenderObject* object)
     86 {
     87     ASSERT(!object || object->isWidget());
     88     return static_cast<const RenderWidget*>(object);
     89 }
     90 
     91 // This will catch anyone doing an unnecessary cast.
     92 void toRenderWidget(const RenderWidget*);
     93 
     94 } // namespace WebCore
     95 
     96 #endif // RenderWidget_h
     97