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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef WebScrollbarThemePainter_h
     27 #define WebScrollbarThemePainter_h
     28 
     29 #include "WebCanvas.h"
     30 
     31 namespace WebCore {
     32 class ScrollbarTheme;
     33 class Scrollbar;
     34 };
     35 
     36 namespace blink {
     37 
     38 class WebScrollbar;
     39 struct WebRect;
     40 
     41 class WebScrollbarThemePainter {
     42 public:
     43     WebScrollbarThemePainter() : m_theme(0) { }
     44     WebScrollbarThemePainter(const WebScrollbarThemePainter& painter) { assign(painter); }
     45     virtual ~WebScrollbarThemePainter() { }
     46     WebScrollbarThemePainter& operator=(const WebScrollbarThemePainter& painter)
     47     {
     48         assign(painter);
     49         return *this;
     50     }
     51 
     52     BLINK_EXPORT void assign(const WebScrollbarThemePainter&);
     53 
     54     BLINK_EXPORT void paintScrollbarBackground(WebCanvas*, const WebRect&);
     55     BLINK_EXPORT void paintTrackBackground(WebCanvas*, const WebRect&);
     56     BLINK_EXPORT void paintBackTrackPart(WebCanvas*, const WebRect&);
     57     BLINK_EXPORT void paintForwardTrackPart(WebCanvas*, const WebRect&);
     58     BLINK_EXPORT void paintBackButtonStart(WebCanvas*, const WebRect&);
     59     BLINK_EXPORT void paintBackButtonEnd(WebCanvas*, const WebRect&);
     60     BLINK_EXPORT void paintForwardButtonStart(WebCanvas*, const WebRect&);
     61     BLINK_EXPORT void paintForwardButtonEnd(WebCanvas*, const WebRect&);
     62     BLINK_EXPORT void paintTickmarks(WebCanvas*, const WebRect&);
     63     BLINK_EXPORT void paintThumb(WebCanvas*, const WebRect&);
     64 
     65 #if BLINK_IMPLEMENTATION
     66     WebScrollbarThemePainter(WebCore::ScrollbarTheme*, WebCore::Scrollbar*);
     67 #endif
     68 
     69 private:
     70     // The theme is not owned by this class. It is assumed that the theme is a
     71     // static pointer and its lifetime is essentially infinite. The functions
     72     // called from the painter may not be thread-safe, so all calls must be made
     73     // from the same thread that it is created on.
     74     WebCore::ScrollbarTheme* m_theme;
     75 
     76     // It is assumed that the constructor of this paint object is responsible
     77     // for the lifetime of this scrollbar. The painter has to use the real
     78     // scrollbar (and not a WebScrollbar wrapper) due to static_casts for
     79     // RenderScrollbar and pointer-based HashMap lookups for Lion scrollbars.
     80     WebCore::Scrollbar* m_scrollbar;
     81 };
     82 
     83 } // namespace blink
     84 
     85 #endif
     86