AccessibilityScrollbar.cpp revision ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddb 
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
37namespace WebCore {
38
39AccessibilityScrollbar::AccessibilityScrollbar(Scrollbar* scrollbar)
40    : m_scrollbar(scrollbar)
41    , m_parent(0)
42{
43    ASSERT(scrollbar);
44}
45
46PassRefPtr<AccessibilityScrollbar> AccessibilityScrollbar::create(Scrollbar* scrollbar)
47{
48    return adoptRef(new AccessibilityScrollbar(scrollbar));
49}
50
51IntRect AccessibilityScrollbar::elementRect() const
52{
53    if (!m_scrollbar)
54        return IntRect();
55
56    return m_scrollbar->frameRect();
57}
58
59Document* AccessibilityScrollbar::document() const
60{
61    AccessibilityObject* parent = parentObject();
62    if (!parent)
63        return 0;
64    return parent->document();
65}
66
67AccessibilityOrientation 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
80bool AccessibilityScrollbar::isEnabled() const
81{
82    if (!m_scrollbar)
83        return false;
84    return m_scrollbar->enabled();
85}
86
87float AccessibilityScrollbar::valueForRange() const
88{
89    if (!m_scrollbar)
90        return 0;
91
92    return m_scrollbar->currentPos() / m_scrollbar->maximum();
93}
94
95void 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