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      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 #include "config.h"
     30 #include "AccessibilityScrollbar.h"
     31 
     32 #include "AXObjectCache.h"
     33 #include "FrameView.h"
     34 #include "ScrollView.h"
     35 #include "Scrollbar.h"
     36 
     37 namespace WebCore {
     38 
     39 AccessibilityScrollbar::AccessibilityScrollbar(Scrollbar* scrollbar)
     40     : m_scrollbar(scrollbar)
     41     , m_parent(0)
     42 {
     43     ASSERT(scrollbar);
     44 }
     45 
     46 PassRefPtr<AccessibilityScrollbar> AccessibilityScrollbar::create(Scrollbar* scrollbar)
     47 {
     48     return adoptRef(new AccessibilityScrollbar(scrollbar));
     49 }
     50 
     51 IntRect AccessibilityScrollbar::elementRect() const
     52 {
     53     if (!m_scrollbar)
     54         return IntRect();
     55 
     56     return m_scrollbar->frameRect();
     57 }
     58 
     59 Document* AccessibilityScrollbar::document() const
     60 {
     61     AccessibilityObject* parent = parentObject();
     62     if (!parent)
     63         return 0;
     64     return parent->document();
     65 }
     66 
     67 AccessibilityOrientation AccessibilityScrollbar::orientation() const
     68 {
     69     if (!m_scrollbar)
     70         return AccessibilityOrientationHorizontal;
     71 
     72     if (m_scrollbar->orientation() == HorizontalScrollbar)
     73         return AccessibilityOrientationHorizontal;
     74     if (m_scrollbar->orientation() == VerticalScrollbar)
     75         return AccessibilityOrientationVertical;
     76 
     77     return AccessibilityOrientationHorizontal;
     78 }
     79 
     80 bool AccessibilityScrollbar::isEnabled() const
     81 {
     82     if (!m_scrollbar)
     83         return false;
     84     return m_scrollbar->enabled();
     85 }
     86 
     87 float AccessibilityScrollbar::valueForRange() const
     88 {
     89     if (!m_scrollbar)
     90         return 0;
     91 
     92     return m_scrollbar->currentPos() / m_scrollbar->maximum();
     93 }
     94 
     95 void AccessibilityScrollbar::setValue(float value)
     96 {
     97     if (!m_scrollbar)
     98         return;
     99 
    100     if (!m_scrollbar->scrollableArea())
    101         return;
    102 
    103     float newValue = value * m_scrollbar->maximum();
    104     m_scrollbar->scrollableArea()->scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), newValue);
    105 }
    106 
    107 } // namespace WebCore
    108