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
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import <Cocoa/Cocoa.h>
#import "content/browser/accessibility/browser_accessibility_mac.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
#import "content/browser/accessibility/browser_accessibility_cocoa.h"
#include "content/browser/accessibility/browser_accessibility_manager_mac.h"
namespace content {
// Static.
BrowserAccessibility* BrowserAccessibility::Create() {
return new BrowserAccessibilityMac();
}
BrowserAccessibilityMac::BrowserAccessibilityMac()
: browser_accessibility_cocoa_(NULL) {}
BrowserAccessibilityMac::~BrowserAccessibilityMac() {
// Detach this object from |browser_accessibility_cocoa_| so it
// no longer has a pointer to this object.
[browser_accessibility_cocoa_ detach];
// Now, release it - but at this point, other processes may have a
// reference to the cocoa object.
[browser_accessibility_cocoa_ release];
}
void BrowserAccessibilityMac::OnDataChanged() {
BrowserAccessibility::OnDataChanged();
if (browser_accessibility_cocoa_) {
[browser_accessibility_cocoa_ childrenChanged];
return;
}
// We take ownership of the Cocoa object here.
browser_accessibility_cocoa_ =
[[BrowserAccessibilityCocoa alloc] initWithObject:this];
}
// Replace a native object and refocus if it had focus.
// This will force VoiceOver to re-announce it, and refresh Braille output.
void BrowserAccessibilityMac::ReplaceNativeObject() {
BrowserAccessibilityCocoa* old_native_obj = browser_accessibility_cocoa_;
browser_accessibility_cocoa_ =
[[BrowserAccessibilityCocoa alloc] initWithObject:this];
// Replace child in parent.
BrowserAccessibility* parent = PlatformGetParent();
if (!parent)
return;
base::scoped_nsobject<NSMutableArray> new_children;
NSArray* old_children = [ToBrowserAccessibilityCocoa(parent) children];
for (uint i = 0; i < [old_children count]; ++i) {
BrowserAccessibilityCocoa* child = [old_children objectAtIndex:i];
if (child == old_native_obj)
[new_children addObject:browser_accessibility_cocoa_];
else
[new_children addObject:child];
}
[ToBrowserAccessibilityCocoa(parent) swapChildren:&new_children];
// If focused, fire a focus notification on the new native object.
if (manager_->GetFocus() == this) {
NSAccessibilityPostNotification(
browser_accessibility_cocoa_,
NSAccessibilityFocusedUIElementChangedNotification);
}
// Destroy after a delay so that VO is securely on the new focus first,
// otherwise the focus event will not be announced.
// We use 1000ms; however, this magic number isn't necessary to avoid
// use-after-free or anything scary like that. The worst case scenario if this
// gets destroyed, too early is that VoiceOver announces the wrong thing once.
base::scoped_nsobject<BrowserAccessibilityCocoa> retained_destroyed_node(
[old_native_obj retain]);
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE,
base::BindOnce(
[](base::scoped_nsobject<BrowserAccessibilityCocoa> destroyed) {
if (destroyed && [destroyed instanceActive]) {
// Follow destruction pattern from NativeReleaseReference().
[destroyed detach];
[destroyed release];
}
},
std::move(retained_destroyed_node)),
base::TimeDelta::FromMilliseconds(1000));
}
uint32_t BrowserAccessibilityMac::PlatformChildCount() const {
uint32_t child_count = BrowserAccessibility::PlatformChildCount();
// If this is a table, include the extra fake nodes generated by
// AXTableInfo, for the column nodes and the table header container, all of
// which are only important on macOS.
const std::vector<ui::AXNode*>* extra_mac_nodes = node()->GetExtraMacNodes();
if (!extra_mac_nodes)
return child_count;
return child_count + extra_mac_nodes->size();
}
BrowserAccessibility* BrowserAccessibilityMac::PlatformGetChild(
uint32_t child_index) const {
if (child_index < BrowserAccessibility::PlatformChildCount())
return BrowserAccessibility::PlatformGetChild(child_index);
if (child_index >= PlatformChildCount())
return nullptr;
// If this is a table, include the extra fake nodes generated by
// AXTableInfo, for the column nodes and the table header container, all of
// which are only important on macOS.
const std::vector<ui::AXNode*>* extra_mac_nodes = node()->GetExtraMacNodes();
if (!extra_mac_nodes || extra_mac_nodes->empty())
return nullptr;
child_index -= BrowserAccessibility::PlatformChildCount();
if (child_index < extra_mac_nodes->size())
return manager_->GetFromAXNode((*extra_mac_nodes)[child_index]);
return nullptr;
}
BrowserAccessibility* BrowserAccessibilityMac::PlatformGetFirstChild() const {
return PlatformGetChild(0);
}
BrowserAccessibility* BrowserAccessibilityMac::PlatformGetLastChild() const {
const std::vector<ui::AXNode*>* extra_mac_nodes = node()->GetExtraMacNodes();
if (extra_mac_nodes && !extra_mac_nodes->empty())
return manager_->GetFromAXNode(extra_mac_nodes->back());
return BrowserAccessibility::PlatformGetLastChild();
}
BrowserAccessibility* BrowserAccessibilityMac::PlatformGetNextSibling() const {
BrowserAccessibility* parent = PlatformGetParent();
if (parent) {
uint32_t next_child_index = node()->GetUnignoredIndexInParent() + 1;
if (next_child_index >= parent->InternalChildCount() &&
next_child_index < parent->PlatformChildCount()) {
// get the extra_mac_node
return parent->PlatformGetChild(next_child_index);
} else if (next_child_index >= parent->PlatformChildCount()) {
return nullptr;
}
}
return BrowserAccessibility::PlatformGetNextSibling();
}
BrowserAccessibility* BrowserAccessibilityMac::PlatformGetPreviousSibling()
const {
BrowserAccessibility* parent = PlatformGetParent();
if (parent) {
uint32_t previous_child_index = node()->GetUnignoredIndexInParent() - 1;
if (previous_child_index >= parent->InternalChildCount() &&
previous_child_index < parent->PlatformChildCount()) {
// get the extra_mac_node
return parent->PlatformGetChild(previous_child_index);
} else if (previous_child_index < 0) {
return nullptr;
}
}
return BrowserAccessibility::PlatformGetPreviousSibling();
}
const BrowserAccessibilityCocoa* ToBrowserAccessibilityCocoa(
const BrowserAccessibility* obj) {
DCHECK(obj);
return static_cast<const BrowserAccessibilityMac*>(obj)->native_view();
}
BrowserAccessibilityCocoa* ToBrowserAccessibilityCocoa(
BrowserAccessibility* obj) {
DCHECK(obj);
return static_cast<BrowserAccessibilityMac*>(obj)->native_view();
}
} // namespace content
|
