1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Copyright (C) 2008 Nuanti Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "AXObjectCache.h"
#include "AccessibilityObject.h"
#include "AccessibilityObjectWrapperAtk.h"
#include "AccessibilityRenderObject.h"
#include "GOwnPtr.h"
#include "Range.h"
#include "SelectElement.h"
#include "TextIterator.h"
namespace WebCore {
void AXObjectCache::detachWrapper(AccessibilityObject* obj)
{
webkit_accessible_detach(WEBKIT_ACCESSIBLE(obj->wrapper()));
}
void AXObjectCache::attachWrapper(AccessibilityObject* obj)
{
AtkObject* atkObj = ATK_OBJECT(webkit_accessible_new(obj));
obj->setWrapper(atkObj);
g_object_unref(atkObj);
}
static AccessibilityObject* getListObject(AccessibilityObject* object)
{
// Only list boxes and menu lists supported so far.
if (!object->isListBox() && !object->isMenuList())
return 0;
// For list boxes the list object is just itself.
if (object->isListBox())
return object;
// For menu lists we need to return the first accessible child,
// with role MenuListPopupRole, since that's the one holding the list
// of items with role MenuListOptionRole.
AccessibilityObject::AccessibilityChildrenVector children = object->children();
if (!children.size())
return 0;
AccessibilityObject* listObject = children.at(0).get();
if (!listObject->isMenuListPopup())
return 0;
return listObject;
}
static void notifyChildrenSelectionChange(AccessibilityObject* object)
{
// This static variables are needed to keep track of the old
// focused object and its associated list object, as per previous
// calls to this function, in order to properly decide whether to
// emit some signals or not.
DEFINE_STATIC_LOCAL(RefPtr<AccessibilityObject>, oldListObject, ());
DEFINE_STATIC_LOCAL(RefPtr<AccessibilityObject>, oldFocusedObject, ());
// Only list boxes and menu lists supported so far.
if (!object || !(object->isListBox() || object->isMenuList()))
return;
// Emit signal from the listbox's point of view first.
g_signal_emit_by_name(object->wrapper(), "selection-changed");
// Find the item where the selection change was triggered from.
SelectElement* select = toSelectElement(static_cast<Element*>(object->node()));
if (!select)
return;
int changedItemIndex = select->activeSelectionStartListIndex();
AccessibilityObject* listObject = getListObject(object);
if (!listObject) {
oldListObject = 0;
return;
}
AccessibilityObject::AccessibilityChildrenVector items = listObject->children();
if (changedItemIndex < 0 || changedItemIndex >= static_cast<int>(items.size()))
return;
AccessibilityObject* item = items.at(changedItemIndex).get();
// Ensure the current list object is the same than the old one so
// further comparisons make sense. Otherwise, just reset
// oldFocusedObject so it won't be taken into account.
if (oldListObject != listObject)
oldFocusedObject = 0;
AtkObject* axItem = item ? item->wrapper() : 0;
AtkObject* axOldFocusedObject = oldFocusedObject ? oldFocusedObject->wrapper() : 0;
// Old focused object just lost focus, so emit the events.
if (axOldFocusedObject && axItem != axOldFocusedObject) {
g_signal_emit_by_name(axOldFocusedObject, "focus-event", false);
g_signal_emit_by_name(axOldFocusedObject, "state-change", "focused", false);
}
// Emit needed events for the currently (un)selected item.
if (axItem) {
bool isSelected = item->isSelected();
g_signal_emit_by_name(axItem, "state-change", "selected", isSelected);
g_signal_emit_by_name(axItem, "focus-event", isSelected);
g_signal_emit_by_name(axItem, "state-change", "focused", isSelected);
}
// Update pointers to the previously involved objects.
oldListObject = listObject;
oldFocusedObject = item;
}
void AXObjectCache::postPlatformNotification(AccessibilityObject* coreObject, AXNotification notification)
{
AtkObject* axObject = coreObject->wrapper();
if (!axObject)
return;
if (notification == AXCheckedStateChanged) {
if (!coreObject->isCheckboxOrRadio())
return;
g_signal_emit_by_name(axObject, "state-change", "checked", coreObject->isChecked());
} else if (notification == AXSelectedChildrenChanged || notification == AXMenuListValueChanged) {
if (notification == AXMenuListValueChanged && coreObject->isMenuList()) {
g_signal_emit_by_name(axObject, "focus-event", true);
g_signal_emit_by_name(axObject, "state-change", "focused", true);
}
notifyChildrenSelectionChange(coreObject);
}
}
static void emitTextChanged(AccessibilityRenderObject* object, AXObjectCache::AXTextChange textChange, unsigned offset, unsigned count)
{
// Get the axObject for the parent object
AtkObject* wrapper = object->parentObjectUnignored()->wrapper();
if (!wrapper || !ATK_IS_TEXT(wrapper))
return;
// Select the right signal to be emitted
CString detail;
switch (textChange) {
case AXObjectCache::AXTextInserted:
detail = "text-changed::insert";
break;
case AXObjectCache::AXTextDeleted:
detail = "text-changed::delete";
break;
}
if (!detail.isNull())
g_signal_emit_by_name(wrapper, detail.data(), offset, count);
}
void AXObjectCache::nodeTextChangePlatformNotification(AccessibilityObject* object, AXTextChange textChange, unsigned offset, unsigned count)
{
// Sanity check
if (count < 1 || !object || !object->isAccessibilityRenderObject())
return;
Node* node = object->node();
RefPtr<Range> range = Range::create(node->document(), Position(node->parentNode(), 0), Position(node, 0));
emitTextChanged(toAccessibilityRenderObject(object), textChange, offset + TextIterator::rangeLength(range.get()), count);
}
void AXObjectCache::handleFocusedUIElementChanged(RenderObject* oldFocusedRender, RenderObject* newFocusedRender)
{
RefPtr<AccessibilityObject> oldObject = getOrCreate(oldFocusedRender);
if (oldObject) {
g_signal_emit_by_name(oldObject->wrapper(), "focus-event", false);
g_signal_emit_by_name(oldObject->wrapper(), "state-change", "focused", false);
}
RefPtr<AccessibilityObject> newObject = getOrCreate(newFocusedRender);
if (newObject) {
g_signal_emit_by_name(newObject->wrapper(), "focus-event", true);
g_signal_emit_by_name(newObject->wrapper(), "state-change", "focused", true);
}
}
void AXObjectCache::handleScrolledToAnchor(const Node*)
{
}
} // namespace WebCore
|