AccessibilityScrollView.cpp revision 2fc2651226baac27029e38c9d6ef883fa32084db 
1/*
2 * Copyright (C) 2011 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 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "AccessibilityScrollView.h"
28
29#include "AXObjectCache.h"
30#include "AccessibilityScrollbar.h"
31#include "FrameView.h"
32#include "HTMLFrameOwnerElement.h"
33#include "RenderPart.h"
34#include "ScrollView.h"
35
36namespace WebCore {
37
38AccessibilityScrollView::AccessibilityScrollView(ScrollView* view)
39    : m_scrollView(view)
40{
41}
42
43PassRefPtr<AccessibilityScrollView> AccessibilityScrollView::create(ScrollView* view)
44{
45    return adoptRef(new AccessibilityScrollView(view));
46}
47
48AccessibilityObject* AccessibilityScrollView::scrollBar(AccessibilityOrientation orientation) const
49{
50    switch (orientation) {
51    case AccessibilityOrientationVertical:
52        return m_verticalScrollbar ? m_verticalScrollbar.get() : 0;
53    case AccessibilityOrientationHorizontal:
54        return m_horizontalScrollbar ? m_horizontalScrollbar.get() : 0;
55    }
56
57    return 0;
58}
59
60const AccessibilityObject::AccessibilityChildrenVector& AccessibilityScrollView::children()
61{
62    if (!m_haveChildren)
63        addChildren();
64    return m_children;
65}
66
67void AccessibilityScrollView::updateChildrenIfNecessary()
68{
69    if (m_scrollView->horizontalScrollbar() && !m_horizontalScrollbar)
70        m_horizontalScrollbar = addChildScrollbar(m_scrollView->horizontalScrollbar());
71    else if (!m_scrollView->horizontalScrollbar() && m_horizontalScrollbar) {
72        removeChildScrollbar(m_horizontalScrollbar.get());
73        m_horizontalScrollbar = 0;
74    }
75
76    if (m_scrollView->verticalScrollbar() && !m_verticalScrollbar)
77        m_verticalScrollbar = addChildScrollbar(m_scrollView->verticalScrollbar());
78    else if (!m_scrollView->verticalScrollbar() && m_verticalScrollbar) {
79        removeChildScrollbar(m_verticalScrollbar.get());
80        m_verticalScrollbar = 0;
81    }
82}
83
84void AccessibilityScrollView::removeChildScrollbar(AccessibilityObject* scrollbar)
85{
86    size_t pos = m_children.find(scrollbar);
87    if (pos != WTF::notFound)
88        m_children.remove(pos);
89}
90
91AccessibilityScrollbar* AccessibilityScrollView::addChildScrollbar(Scrollbar* scrollbar)
92{
93    if (!scrollbar)
94        return 0;
95
96    AccessibilityScrollbar* scrollBarObject = static_cast<AccessibilityScrollbar*>(axObjectCache()->getOrCreate(scrollbar));
97    scrollBarObject->setParent(this);
98    m_children.append(scrollBarObject);
99    return scrollBarObject;
100}
101
102void AccessibilityScrollView::addChildren()
103{
104    ASSERT(!m_haveChildren);
105    m_haveChildren = true;
106
107    AccessibilityObject* webArea = webAreaObject();
108    if (webArea)
109        m_children.append(webArea);
110
111    updateChildrenIfNecessary();
112}
113
114AccessibilityObject* AccessibilityScrollView::webAreaObject() const
115{
116    if (!m_scrollView->isFrameView())
117        return 0;
118
119    Document* doc = static_cast<FrameView*>(m_scrollView.get())->frame()->document();
120    if (!doc || !doc->renderer())
121        return 0;
122
123    return axObjectCache()->getOrCreate(doc->renderer());
124}
125
126AccessibilityObject* AccessibilityScrollView::accessibilityHitTest(const IntPoint& point) const
127{
128    AccessibilityObject* webArea = webAreaObject();
129    if (!webArea)
130        return 0;
131
132    if (m_horizontalScrollbar && m_horizontalScrollbar->elementRect().contains(point))
133        return m_horizontalScrollbar.get();
134    if (m_verticalScrollbar && m_verticalScrollbar->elementRect().contains(point))
135        return m_verticalScrollbar.get();
136
137    return webArea->accessibilityHitTest(point);
138}
139
140IntRect AccessibilityScrollView::elementRect() const
141{
142    return m_scrollView->frameRect();
143}
144
145FrameView* AccessibilityScrollView::documentFrameView() const
146{
147    if (!m_scrollView->isFrameView())
148        return 0;
149
150    return static_cast<FrameView*>(m_scrollView.get());
151}
152
153AccessibilityObject* AccessibilityScrollView::parentObject() const
154{
155    if (!m_scrollView->isFrameView())
156        return 0;
157
158    HTMLFrameOwnerElement* owner = static_cast<FrameView*>(m_scrollView.get())->frame()->ownerElement();
159    if (owner && owner->renderPart())
160        return axObjectCache()->getOrCreate(owner->renderPart()->parent());
161
162    return 0;
163}
164
165} // namespace WebCore
166