Windows-4.7.4/src/3rdparty/webkit/WebCore/accessibility/AccessibilityScrollbar.h

/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */
 
#ifndef AccessibilityScrollbar_h
#define AccessibilityScrollbar_h

#include "AccessibilityObject.h"

namespace WebCore {

class Scrollbar;

class AccessibilityScrollbar : public AccessibilityObject {
public:
    static PassRefPtr<AccessibilityScrollbar> create();

    void setScrollbar(Scrollbar* scrollbar) { m_scrollbar = scrollbar; }

    virtual AccessibilityRole roleValue() const { return ScrollBarRole; }

    virtual float valueForRange() const;

private:
    AccessibilityScrollbar();

    virtual bool accessibilityIsIgnored() const { return false; }

    // These should never be reached since the AccessibilityScrollbar is not part of
    // the accessibility tree.
    virtual IntSize size() const { ASSERT_NOT_REACHED(); return IntSize(); }
    virtual IntRect elementRect() const { ASSERT_NOT_REACHED(); return IntRect(); }
    virtual AccessibilityObject* parentObject() const { ASSERT_NOT_REACHED(); return 0; }

    Scrollbar* m_scrollbar;
};

} // namespace WebCore

#endif // AccessibilityScrollbar_h