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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006, 2009, 2010 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 #include "Widget.h"
     28 
     29 namespace WebCore {
     30 
     31 class RenderWidget : public RenderReplaced, private OverlapTestRequestClient {
     32 public:
     33     virtual ~RenderWidget();
     34 
     35     Widget* widget() const { return m_widget.get(); }
     36     virtual void setWidget(PassRefPtr<Widget>);
     37 
     38     static RenderWidget* find(const Widget*);
     39 
     40     void updateWidgetPosition();
     41     void widgetPositionsUpdated();
     42     IntRect windowClipRect() const;
     43 
     44     void showSubstituteImage(PassRefPtr<Image>);
     45 
     46     void notifyWidget(WidgetNotification);
     47 
     48     static void suspendWidgetHierarchyUpdates();
     49     static void resumeWidgetHierarchyUpdates();
     50 
     51     RenderArena* ref() { ++m_refCount; return renderArena(); }
     52     void deref(RenderArena*);
     53 
     54 protected:
     55     RenderWidget(Node*);
     56 
     57     FrameView* frameView() const { return m_frameView; }
     58 
     59     void clearWidget();
     60 
     61     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     62     virtual void layout();
     63     virtual void paint(PaintInfo&, int x, int y);
     64 
     65 private:
     66     virtual bool isWidget() const { return true; }
     67 
     68     virtual void destroy();
     69     virtual void setSelectionState(SelectionState);
     70     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
     71     virtual void setOverlapTestResult(bool);
     72 
     73     bool setWidgetGeometry(const IntRect&, const IntSize&);
     74 
     75     RefPtr<Widget> m_widget;
     76     RefPtr<Image> m_substituteImage;
     77     FrameView* m_frameView;
     78     IntRect m_clipRect; // The rectangle needs to remain correct after scrolling, so it is stored in content view coordinates, and not clipped to window.
     79     int m_refCount;
     80 };
     81 
     82 inline RenderWidget* toRenderWidget(RenderObject* object)
     83 {
     84     ASSERT(!object || object->isWidget());
     85     return static_cast<RenderWidget*>(object);
     86 }
     87 
     88 inline const RenderWidget* toRenderWidget(const RenderObject* object)
     89 {
     90     ASSERT(!object || object->isWidget());
     91     return static_cast<const RenderWidget*>(object);
     92 }
     93 
     94 // This will catch anyone doing an unnecessary cast.
     95 void toRenderWidget(const RenderWidget*);
     96 
     97 } // namespace WebCore
     98 
     99 #endif // RenderWidget_h
    100