1 /*

     2  * Copyright (C) 2010 Apple 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  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    14  *     its contributors may be used to endorse or promote products derived

    15  *     from this software without specific prior written permission.

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

    18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

    26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    27  */

    28  

    29 #ifndef AccessibilityScrollbar_h

    30 #define AccessibilityScrollbar_h

    31 

    32 #include "AccessibilityObject.h"

    33 

    34 namespace WebCore {

    35 

    36 class Scrollbar;

    37 

    38 class AccessibilityScrollbar : public AccessibilityObject {

    39 public:

    40     static PassRefPtr<AccessibilityScrollbar> create();

    41 

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

    43 

    44     virtual AccessibilityRole roleValue() const { return ScrollBarRole; }

    45 

    46     virtual float valueForRange() const;

    47 

    48 private:

    49     AccessibilityScrollbar();

    50 

    51     virtual bool accessibilityIsIgnored() const { return false; }

    52 

    53     // These should never be reached since the AccessibilityScrollbar is not part of

    54     // the accessibility tree.

    55     virtual IntSize size() const { ASSERT_NOT_REACHED(); return IntSize(); }

    56     virtual IntRect elementRect() const { ASSERT_NOT_REACHED(); return IntRect(); }

    57     virtual AccessibilityObject* parentObject() const { ASSERT_NOT_REACHED(); return 0; }

    58 

    59     Scrollbar* m_scrollbar;

    60 };

    61 

    62 } // namespace WebCore

    63 

    64 #endif // AccessibilityScrollbar_h