scrollbarthemechromium.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
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 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 * 
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 */

#ifndef ScrollbarThemeChromium_h
#define ScrollbarThemeChromium_h

#include "ScrollbarThemeComposite.h"

namespace WebCore {

    class PlatformMouseEvent;

    // This class contains the Chromium scrollbar implementations for Windows
    // and Linux. All of the symbols here in must be defined somewhere in the
    // code and we manage the platform specific parts by linking in different,
    // platform specific, files. Methods that we shared across platforms are
    // implemented in ScrollbarThemeChromium.cpp
    class ScrollbarThemeChromium : public ScrollbarThemeComposite {
    public:
        ScrollbarThemeChromium();
        virtual ~ScrollbarThemeChromium();

        virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar);

        virtual void themeChanged();
        
        virtual bool invalidateOnMouseEnterExit();

    protected:
        virtual bool hasButtons(Scrollbar*) { return true; }
        virtual bool hasThumb(Scrollbar*);

        virtual IntRect backButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
        virtual IntRect forwardButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
        virtual IntRect trackRect(Scrollbar*, bool painting = false);

        virtual void paintScrollCorner(ScrollView*, GraphicsContext*, const IntRect&);
        virtual bool shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent&);

        virtual void paintTrackBackground(GraphicsContext*, Scrollbar*, const IntRect&);
        virtual void paintTrackPiece(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart);
        virtual void paintButton(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart);
        virtual void paintThumb(GraphicsContext*, Scrollbar*, const IntRect&);
        virtual void paintTickmarks(GraphicsContext*, Scrollbar*, const IntRect&);

    private:
        IntSize buttonSize(Scrollbar*);

        int getThemeState(Scrollbar*, ScrollbarPart) const;
        int getThemeArrowState(Scrollbar*, ScrollbarPart) const;
        int getClassicThemeState(Scrollbar*, ScrollbarPart) const;
    };

} // namespace WebCore

#endif