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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/AXScrollbar.h"
     31 
     32 #include "platform/scroll/ScrollView.h"
     33 
     34 namespace blink {
     35 
     36 AXScrollbar::AXScrollbar(Scrollbar* scrollbar)
     37     : m_scrollbar(scrollbar)
     38 {
     39     ASSERT(scrollbar);
     40 }
     41 
     42 void AXScrollbar::detachFromParent()
     43 {
     44     m_scrollbar = nullptr;
     45     AXMockObject::detachFromParent();
     46 }
     47 
     48 PassRefPtr<AXScrollbar> AXScrollbar::create(Scrollbar* scrollbar)
     49 {
     50     return adoptRef(new AXScrollbar(scrollbar));
     51 }
     52 
     53 LayoutRect AXScrollbar::elementRect() const
     54 {
     55     if (!m_scrollbar)
     56         return LayoutRect();
     57 
     58     return m_scrollbar->frameRect();
     59 }
     60 
     61 Document* AXScrollbar::document() const
     62 {
     63     AXObject* parent = parentObject();
     64     if (!parent)
     65         return 0;
     66     return parent->document();
     67 }
     68 
     69 AccessibilityOrientation AXScrollbar::orientation() const
     70 {
     71     if (!m_scrollbar)
     72         return AccessibilityOrientationHorizontal;
     73 
     74     if (m_scrollbar->orientation() == HorizontalScrollbar)
     75         return AccessibilityOrientationHorizontal;
     76     if (m_scrollbar->orientation() == VerticalScrollbar)
     77         return AccessibilityOrientationVertical;
     78 
     79     return AccessibilityOrientationHorizontal;
     80 }
     81 
     82 bool AXScrollbar::isEnabled() const
     83 {
     84     if (!m_scrollbar)
     85         return false;
     86     return m_scrollbar->enabled();
     87 }
     88 
     89 float AXScrollbar::valueForRange() const
     90 {
     91     if (!m_scrollbar)
     92         return 0;
     93 
     94     return m_scrollbar->currentPos() / m_scrollbar->maximum();
     95 }
     96 
     97 void AXScrollbar::setValue(float value)
     98 {
     99     if (!m_scrollbar)
    100         return;
    101 
    102     if (!m_scrollbar->scrollableArea())
    103         return;
    104 
    105     float newValue = value * m_scrollbar->maximum();
    106     m_scrollbar->scrollableArea()->scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), newValue);
    107 }
    108 
    109 } // namespace blink
    110