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
201
202
203
|
// Copyright 2020 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.
#include "ui/views/accessibility/views_ax_tree_manager.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/check.h"
#include "base/location.h"
#include "base/notreached.h"
#include "base/threading/sequenced_task_runner_handle.h"
#include "ui/accessibility/accessibility_features.h"
#include "ui/accessibility/ax_action_data.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_tree_manager_map.h"
#include "ui/accessibility/ax_tree_source_checker.h"
#include "ui/accessibility/ax_tree_update.h"
#include "ui/views/accessibility/ax_aura_obj_wrapper.h"
#include "ui/views/accessibility/widget_ax_tree_id_map.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
namespace views {
ViewsAXTreeManager::ViewsAXTreeManager(Widget* widget)
: widget_(widget),
tree_id_(ui::AXTreeID::CreateNewAXTreeID()),
tree_source_(cache_.GetOrCreate(widget), tree_id_, &cache_),
tree_serializer_(&tree_source_),
event_generator_(&ax_tree_) {
DCHECK(widget);
ui::AXTreeManagerMap::GetInstance().AddTreeManager(tree_id_, this);
views::WidgetAXTreeIDMap::GetInstance().AddWidget(tree_id_, widget);
views_event_observer_.Observe(AXEventManager::Get());
widget_observer_.Observe(widget);
View* root_view = widget->GetRootView();
if (root_view)
root_view->NotifyAccessibilityEvent(ax::mojom::Event::kLoadComplete, true);
}
ViewsAXTreeManager::~ViewsAXTreeManager() {
event_generator_.ReleaseTree();
views_event_observer_.Reset();
widget_observer_.Reset();
ui::AXTreeManagerMap::GetInstance().RemoveTreeManager(tree_id_);
}
void ViewsAXTreeManager::SetGeneratedEventCallbackForTesting(
const GeneratedEventCallbackForTesting& callback) {
generated_event_callback_for_testing_ = callback;
}
void ViewsAXTreeManager::UnsetGeneratedEventCallbackForTesting() {
generated_event_callback_for_testing_.Reset();
}
ui::AXNode* ViewsAXTreeManager::GetNodeFromTree(
const ui::AXTreeID tree_id,
const ui::AXNodeID node_id) const {
if (!widget_)
return nullptr;
const ui::AXTreeManager* manager =
ui::AXTreeManagerMap::GetInstance().GetManager(tree_id);
return manager ? manager->GetNodeFromTree(node_id) : nullptr;
}
ui::AXNode* ViewsAXTreeManager::GetNodeFromTree(
const ui::AXNodeID node_id) const {
if (!widget_)
return nullptr;
return ax_tree_.GetFromId(node_id);
}
ui::AXTreeID ViewsAXTreeManager::GetTreeID() const {
return tree_id_;
}
ui::AXTreeID ViewsAXTreeManager::GetParentTreeID() const {
// TODO(nektar): Implement stiching of AXTrees, e.g. a dialog to the main
// window.
return ui::AXTreeIDUnknown();
}
ui::AXNode* ViewsAXTreeManager::GetRootAsAXNode() const {
if (!widget_)
return nullptr;
return ax_tree_.root();
}
ui::AXNode* ViewsAXTreeManager::GetParentNodeFromParentTreeAsAXNode() const {
// TODO(nektar): Implement stiching of AXTrees, e.g. a dialog to the main
// window.
return nullptr;
}
std::string ViewsAXTreeManager::ToString() const {
return "<ViewsAXTreeManager>";
}
void ViewsAXTreeManager::OnViewEvent(View* view, ax::mojom::Event event) {
DCHECK(view);
AXAuraObjWrapper* wrapper = cache_.GetOrCreate(view);
if (!wrapper)
return;
modified_nodes_.insert(wrapper->GetUniqueId());
if (waiting_to_serialize_)
return;
waiting_to_serialize_ = true;
base::SequencedTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(&ViewsAXTreeManager::SerializeTreeUpdates,
weak_factory_.GetWeakPtr()));
}
void ViewsAXTreeManager::OnWidgetDestroyed(Widget* widget) {
if (widget->is_top_level())
views::WidgetAXTreeIDMap::GetInstance().RemoveWidget(widget);
widget_ = nullptr;
}
void ViewsAXTreeManager::OnWidgetClosing(Widget* widget) {
if (widget->is_top_level())
views::WidgetAXTreeIDMap::GetInstance().RemoveWidget(widget);
widget_ = nullptr;
}
void ViewsAXTreeManager::PerformAction(const ui::AXActionData& data) {
if (!widget_)
return;
tree_source_.HandleAccessibleAction(data);
}
void ViewsAXTreeManager::SerializeTreeUpdates() {
if (!widget_)
return;
// Better to set this flag to false early in case this method, or any method
// it calls, causes an event to get fired.
waiting_to_serialize_ = false;
// Make sure the focused node is serialized.
AXAuraObjWrapper* focused_wrapper = cache_.GetFocus();
if (focused_wrapper)
modified_nodes_.insert(focused_wrapper->GetUniqueId());
std::vector<ui::AXTreeUpdate> updates;
for (const ui::AXNodeID node_id : modified_nodes_) {
AXAuraObjWrapper* wrapper = cache_.Get(node_id);
if (!wrapper)
continue;
ui::AXTreeUpdate update;
if (!tree_serializer_.SerializeChanges(wrapper, &update)) {
std::string error;
ui::AXTreeSourceChecker<AXAuraObjWrapper*> checker(&tree_source_);
checker.CheckAndGetErrorString(&error);
NOTREACHED() << error << '\n' << update.ToString();
return;
}
updates.push_back(update);
}
UnserializeTreeUpdates(updates);
}
void ViewsAXTreeManager::UnserializeTreeUpdates(
const std::vector<ui::AXTreeUpdate>& updates) {
if (!widget_)
return;
for (const ui::AXTreeUpdate& update : updates) {
if (!ax_tree_.Unserialize(update)) {
NOTREACHED() << ax_tree_.error();
return;
}
}
// Unserializing the updates into our AXTree should have prompted our
// AXEventGenerator to generate events based on the updates.
for (const ui::AXEventGenerator::TargetedEvent& targeted_event :
event_generator_) {
FireGeneratedEvent(targeted_event.event_params.event, *targeted_event.node);
}
event_generator_.ClearEvents();
}
void ViewsAXTreeManager::FireGeneratedEvent(
const ui::AXEventGenerator::Event& event,
const ui::AXNode& node) const {
if (!generated_event_callback_for_testing_.is_null())
generated_event_callback_for_testing_.Run(widget_, event, node.id());
// TODO(nektar): Implement this other than "for testing".
}
} // namespace views
|
