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