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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #ifndef RenderSlider_h
     22 #define RenderSlider_h
     23 
     24 #include "RenderBlock.h"
     25 
     26 namespace WebCore {
     27 
     28     class HTMLInputElement;
     29     class MouseEvent;
     30     class SliderThumbElement;
     31 
     32     class RenderSlider : public RenderBlock {
     33     public:
     34         RenderSlider(HTMLInputElement*);
     35         virtual ~RenderSlider();
     36 
     37         bool inDragMode() const;
     38         IntRect thumbRect();
     39 
     40     private:
     41         virtual const char* renderName() const { return "RenderSlider"; }
     42         virtual bool isSlider() const { return true; }
     43 
     44         virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
     45         virtual void computePreferredLogicalWidths();
     46         virtual void layout();
     47 
     48         // FIXME: Eventually, the logic of manipulating slider thumb should move to
     49         // SliderThumbElement and accessing shadowSliderThumb should not be necessary in this class.
     50         SliderThumbElement* shadowSliderThumb() const;
     51 
     52         virtual bool requiresForcedStyleRecalcPropagation() const { return true; }
     53     };
     54 
     55     inline RenderSlider* toRenderSlider(RenderObject* object)
     56     {
     57         ASSERT(!object || object->isSlider());
     58         return static_cast<RenderSlider*>(object);
     59     }
     60 
     61     // This will catch anyone doing an unnecessary cast.
     62     void toRenderSlider(const RenderSlider*);
     63 
     64 } // namespace WebCore
     65 
     66 #endif // RenderSlider_h
     67