1/*
2 * Copyright (C) 2016 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 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 "AccessibilityLabel.h"
31
32#include "AXObjectCache.h"
33#include "HTMLNames.h"
34
35namespace WebCore {
36
37using namespace HTMLNames;
38
39AccessibilityLabel::AccessibilityLabel(RenderObject* renderer)
40 : AccessibilityRenderObject(renderer)
41{
42}
43
44AccessibilityLabel::~AccessibilityLabel() = default;
45
46Ref<AccessibilityLabel> AccessibilityLabel::create(RenderObject* renderer)
47{
48 return adoptRef(*new AccessibilityLabel(renderer));
49}
50
51bool AccessibilityLabel::computeAccessibilityIsIgnored() const
52{
53 return accessibilityIsIgnoredByDefault();
54}
55
56String AccessibilityLabel::stringValue() const
57{
58 if (containsOnlyStaticText())
59 return textUnderElement();
60 return AccessibilityNodeObject::stringValue();
61}
62
63static bool childrenContainOnlyStaticText(const AccessibilityObject::AccessibilityChildrenVector& children)
64{
65 if (!children.size())
66 return false;
67 for (const auto& child : children) {
68 if (child->roleValue() == AccessibilityRole::StaticText)
69 continue;
70 if (child->roleValue() == AccessibilityRole::Group) {
71 if (!childrenContainOnlyStaticText(child->children()))
72 return false;
73 } else
74 return false;
75 }
76 return true;
77}
78
79bool AccessibilityLabel::containsOnlyStaticText() const
80{
81 if (m_containsOnlyStaticTextDirty)
82 return childrenContainOnlyStaticText(m_children);
83 return m_containsOnlyStaticText;
84}
85
86static bool childrenContainUnrelatedControls(const AccessibilityObject::AccessibilityChildrenVector& children, AccessibilityObject* controlForLabel)
87{
88 if (!children.size())
89 return false;
90
91 for (const auto& child : children) {
92 if (child->isControl()) {
93 if (child == controlForLabel)
94 continue;
95 return true;
96 }
97
98 if (childrenContainUnrelatedControls(child->children(), controlForLabel))
99 return true;
100 }
101
102 return false;
103}
104
105bool AccessibilityLabel::containsUnrelatedControls() const
106{
107 if (containsOnlyStaticText())
108 return false;
109
110 return childrenContainUnrelatedControls(m_children, correspondingControlForLabelElement());
111}
112
113void AccessibilityLabel::updateChildrenIfNecessary()
114{
115 AccessibilityRenderObject::updateChildrenIfNecessary();
116 if (m_containsOnlyStaticTextDirty)
117 m_containsOnlyStaticText = childrenContainOnlyStaticText(m_children);
118 m_containsOnlyStaticTextDirty = false;
119}
120
121void AccessibilityLabel::clearChildren()
122{
123 AccessibilityRenderObject::clearChildren();
124 m_containsOnlyStaticText = false;
125 m_containsOnlyStaticTextDirty = false;
126}
127
128void AccessibilityLabel::insertChild(AccessibilityObject* object, unsigned index)
129{
130 AccessibilityRenderObject::insertChild(object, index);
131 m_containsOnlyStaticTextDirty = true;
132}
133
134} // namespace WebCore
135