1/*
2 * Copyright (C) 2012 Igalia S.L.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "config.h"
29#include "AccessibilityController.h"
30
31#if HAVE(ACCESSIBILITY)
32
33#include "InjectedBundle.h"
34#include "InjectedBundlePage.h"
35
36#include <WebKit/WKBundlePagePrivate.h>
37#include <atk/atk.h>
38#include <cstdio>
39#include <wtf/glib/GUniquePtr.h>
40#include <wtf/text/StringBuilder.h>
41
42namespace WTR {
43
44void AccessibilityController::resetToConsistentState()
45{
46 m_globalNotificationHandler = nullptr;
47}
48
49static AtkObject* childElementById(AtkObject* parent, const char* id)
50{
51 if (!ATK_IS_OBJECT(parent))
52 return nullptr;
53
54 bool parentFound = false;
55 AtkAttributeSet* attributeSet = atk_object_get_attributes(parent);
56 for (AtkAttributeSet* attributes = attributeSet; attributes; attributes = attributes->next) {
57 AtkAttribute* attribute = static_cast<AtkAttribute*>(attributes->data);
58 if (!strcmp(attribute->name, "html-id")) {
59 if (!strcmp(attribute->value, id))
60 parentFound = true;
61 break;
62 }
63 }
64 atk_attribute_set_free(attributeSet);
65
66 if (parentFound)
67 return parent;
68
69 int childCount = atk_object_get_n_accessible_children(parent);
70 for (int i = 0; i < childCount; i++) {
71 AtkObject* result = childElementById(atk_object_ref_accessible_child(parent, i), id);
72 if (ATK_IS_OBJECT(result))
73 return result;
74 }
75
76 return nullptr;
77}
78
79RefPtr<AccessibilityUIElement> AccessibilityController::accessibleElementById(JSStringRef id)
80{
81 AtkObject* root = ATK_OBJECT(WKAccessibilityRootObject(InjectedBundle::singleton().page()->page()));
82 if (!root)
83 return nullptr;
84
85 size_t bufferSize = JSStringGetMaximumUTF8CStringSize(id);
86 GUniquePtr<gchar> idBuffer(static_cast<gchar*>(g_malloc(bufferSize)));
87 JSStringGetUTF8CString(id, idBuffer.get(), bufferSize);
88
89 AtkObject* result = childElementById(root, idBuffer.get());
90 if (ATK_IS_OBJECT(result))
91 return AccessibilityUIElement::create(result);
92
93 return nullptr;
94}
95
96JSRetainPtr<JSStringRef> AccessibilityController::platformName()
97{
98 JSRetainPtr<JSStringRef> platformName(Adopt, JSStringCreateWithUTF8CString("atk"));
99 return platformName;
100}
101
102Ref<AccessibilityUIElement> AccessibilityController::rootElement()
103{
104 WKBundlePageRef page = InjectedBundle::singleton().page()->page();
105 void* root = WKAccessibilityRootObject(page);
106
107 return AccessibilityUIElement::create(static_cast<AtkObject*>(root));
108}
109
110Ref<AccessibilityUIElement> AccessibilityController::focusedElement()
111{
112 WKBundlePageRef page = InjectedBundle::singleton().page()->page();
113 void* root = WKAccessibilityFocusedObject(page);
114
115 return AccessibilityUIElement::create(static_cast<AtkObject*>(root));
116}
117
118bool AccessibilityController::addNotificationListener(JSValueRef functionCallback)
119{
120 if (!functionCallback)
121 return false;
122
123 // Only one global notification listener.
124 if (!m_globalNotificationHandler)
125 m_globalNotificationHandler = AccessibilityNotificationHandler::create();
126 m_globalNotificationHandler->setNotificationFunctionCallback(functionCallback);
127
128 return true;
129}
130
131bool AccessibilityController::removeNotificationListener()
132{
133 // Programmers should not be trying to remove a listener that's already removed.
134 ASSERT(m_globalNotificationHandler);
135
136 m_globalNotificationHandler = nullptr;
137 return false;
138}
139
140} // namespace WTR
141
142#endif // HAVE(ACCESSIBILITY)
143