forked from mozilla/gecko-dev
-
Notifications
You must be signed in to change notification settings - Fork 2
/
GeckoAccessibility.java
292 lines (259 loc) · 14.8 KB
/
GeckoAccessibility.java
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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import org.mozilla.gecko.gfx.LayerView;
import org.mozilla.gecko.util.ThreadUtils;
import android.view.accessibility.*;
import android.view.View;
import android.util.Log;
import android.os.Build;
import android.os.Bundle;
import android.content.Context;
import android.graphics.Rect;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningServiceInfo;
import java.util.HashSet;
import java.util.Arrays;
import java.util.List;
import org.json.*;
public class GeckoAccessibility {
private static final String LOGTAG = "GeckoAccessibility";
private static final int VIRTUAL_CURSOR_PREVIOUS = 1;
private static final int VIRTUAL_CURSOR_POSITION = 2;
private static final int VIRTUAL_CURSOR_NEXT = 3;
private static boolean sEnabled = false;
// Used to store the JSON message and populate the event later in the code path.
private static JSONObject sEventMessage = null;
private static AccessibilityNodeInfo sVirtualCursorNode = null;
private static final HashSet<String> sServiceWhitelist =
new HashSet<String>(Arrays.asList(new String[] {
"com.google.android.marvin.talkback.TalkBackService", // Google Talkback screen reader
"com.mot.readout.ScreenReader", // Motorola screen reader
"info.spielproject.spiel.SpielService", // Spiel screen reader
"es.codefactory.android.app.ma.MAAccessibilityService" // Codefactory Mobile Accessibility screen reader
}));
public static void updateAccessibilitySettings () {
ThreadUtils.postToBackgroundThread(new Runnable() {
@Override
public void run() {
JSONObject ret = new JSONObject();
sEnabled = false;
AccessibilityManager accessibilityManager =
(AccessibilityManager) GeckoApp.mAppContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
if (accessibilityManager.isEnabled()) {
ActivityManager activityManager =
(ActivityManager) GeckoApp.mAppContext.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningServiceInfo> runningServices = activityManager.getRunningServices(Integer.MAX_VALUE);
for (RunningServiceInfo runningServiceInfo : runningServices) {
sEnabled = sServiceWhitelist.contains(runningServiceInfo.service.getClassName());
if (sEnabled)
break;
}
}
// Disable the dynamic toolbar when enabling accessibility.
// These features tend not to interact well.
GeckoApp.mAppContext.setAccessibilityEnabled(sEnabled);
try {
ret.put("enabled", sEnabled);
} catch (Exception ex) {
Log.e(LOGTAG, "Error building JSON arguments for Accessibility:Settings:", ex);
}
GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:Settings",
ret.toString()));
}
});
}
private static void populateEventFromJSON (AccessibilityEvent event, JSONObject message) {
final JSONArray textArray = message.optJSONArray("text");
if (textArray != null) {
for (int i = 0; i < textArray.length(); i++)
event.getText().add(textArray.optString(i));
}
event.setContentDescription(message.optString("description"));
event.setEnabled(message.optBoolean("enabled", true));
event.setChecked(message.optBoolean("checked"));
event.setPassword(message.optBoolean("password"));
event.setAddedCount(message.optInt("addedCount", -1));
event.setRemovedCount(message.optInt("removedCount", -1));
event.setFromIndex(message.optInt("fromIndex", -1));
event.setItemCount(message.optInt("itemCount", -1));
event.setCurrentItemIndex(message.optInt("currentItemIndex", -1));
event.setBeforeText(message.optString("beforeText"));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
event.setToIndex(message.optInt("toIndex", -1));
event.setScrollable(message.optBoolean("scrollable"));
event.setScrollX(message.optInt("scrollX", -1));
event.setScrollY(message.optInt("scrollY", -1));
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
event.setMaxScrollX(message.optInt("maxScrollX", -1));
event.setMaxScrollY(message.optInt("maxScrollY", -1));
}
}
private static void sendDirectAccessibilityEvent(int eventType, JSONObject message) {
final AccessibilityEvent accEvent = AccessibilityEvent.obtain(eventType);
accEvent.setClassName(GeckoAccessibility.class.getName());
accEvent.setPackageName(GeckoApp.mAppContext.getPackageName());
populateEventFromJSON(accEvent, message);
AccessibilityManager accessibilityManager =
(AccessibilityManager) GeckoApp.mAppContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
try {
accessibilityManager.sendAccessibilityEvent(accEvent);
} catch (IllegalStateException e) {
// Accessibility is off.
}
}
public static void sendAccessibilityEvent (final JSONObject message) {
if (!sEnabled)
return;
final int eventType = message.optInt("eventType", -1);
if (eventType < 0) {
Log.e(LOGTAG, "No accessibility event type provided");
return;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
// Before Jelly Bean we send events directly from here while spoofing the source by setting
// the package and class name manually.
ThreadUtils.postToBackgroundThread(new Runnable() {
@Override
public void run() {
sendDirectAccessibilityEvent(eventType, message);
}
});
} else {
// In Jelly Bean we populate an AccessibilityNodeInfo with the minimal amount of data to have
// it work with TalkBack.
final LayerView view = GeckoApp.mAppContext.getLayerView();
if (view == null)
return;
if (sVirtualCursorNode == null)
sVirtualCursorNode = AccessibilityNodeInfo.obtain(view, VIRTUAL_CURSOR_POSITION);
sVirtualCursorNode.setEnabled(message.optBoolean("enabled", true));
sVirtualCursorNode.setChecked(message.optBoolean("checked"));
sVirtualCursorNode.setPassword(message.optBoolean("password"));
JSONObject bounds = message.optJSONObject("bounds");
if (bounds != null) {
Rect relativeBounds = new Rect(bounds.optInt("left"), bounds.optInt("top"),
bounds.optInt("right"), bounds.optInt("bottom"));
sVirtualCursorNode.setBoundsInParent(relativeBounds);
int[] locationOnScreen = new int[2];
view.getLocationOnScreen(locationOnScreen);
Rect screenBounds = new Rect(relativeBounds);
screenBounds.offset(locationOnScreen[0], locationOnScreen[1]);
sVirtualCursorNode.setBoundsInScreen(screenBounds);
}
ThreadUtils.postToUiThread(new Runnable() {
@Override
public void run() {
// If this is an accessibility focus, a lot of internal voodoo happens so we perform an
// accessibility focus action on the view, and it in turn sends the right events.
switch (eventType) {
case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED:
sEventMessage = message;
view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
break;
case AccessibilityEvent.TYPE_ANNOUNCEMENT:
case AccessibilityEvent.TYPE_VIEW_SCROLLED:
sEventMessage = null;
final AccessibilityEvent accEvent = AccessibilityEvent.obtain(eventType);
view.onInitializeAccessibilityEvent(accEvent);
populateEventFromJSON(accEvent, message);
view.getParent().requestSendAccessibilityEvent(view, accEvent);
break;
default:
sEventMessage = message;
view.sendAccessibilityEvent(eventType);
break;
}
}
});
}
}
public static void setDelegate(LayerView layerview) {
// Only use this delegate in Jelly Bean.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
layerview.setAccessibilityDelegate(new GeckoAccessibilityDelegate());
layerview.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
}
}
public static void onLayerViewFocusChanged(LayerView layerview, boolean gainFocus) {
if (sEnabled)
GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:Focus",
gainFocus ? "true" : "false"));
}
public static class GeckoAccessibilityDelegate extends View.AccessibilityDelegate {
AccessibilityNodeProvider mAccessibilityNodeProvider;
@Override
public void onPopulateAccessibilityEvent (View host, AccessibilityEvent event) {
super.onPopulateAccessibilityEvent(host, event);
if (sEventMessage != null)
populateEventFromJSON(event, sEventMessage);
// We save the hover enter event so that we could reuse it for a subsequent accessibility focus event.
if (event.getEventType() != AccessibilityEvent.TYPE_VIEW_HOVER_ENTER)
sEventMessage = null;
// No matter where the a11y focus is requested, we always force it back to the current vc position.
event.setSource(host, VIRTUAL_CURSOR_POSITION);
}
@Override
public AccessibilityNodeProvider getAccessibilityNodeProvider(final View host) {
if (mAccessibilityNodeProvider == null)
// The accessibility node structure for web content consists of 3 LayerView child nodes:
// 1. VIRTUAL_CURSOR_PREVIOUS: Represents the virtual cursor position that is previous to the
// current one.
// 2. VIRTUAL_CURSOR_POSITION: Represents the current position of the virtual cursor.
// 3. VIRTUAL_CURSOR_NEXT: Represents the next virtual cursor position.
mAccessibilityNodeProvider = new AccessibilityNodeProvider() {
@Override
public AccessibilityNodeInfo createAccessibilityNodeInfo(int virtualDescendantId) {
AccessibilityNodeInfo info = (virtualDescendantId == VIRTUAL_CURSOR_POSITION && sVirtualCursorNode != null) ?
AccessibilityNodeInfo.obtain(sVirtualCursorNode) :
AccessibilityNodeInfo.obtain(host, virtualDescendantId);
switch (virtualDescendantId) {
case View.NO_ID:
// This is the parent LayerView node, populate it with children.
onInitializeAccessibilityNodeInfo(host, info);
info.addChild(host, VIRTUAL_CURSOR_PREVIOUS);
info.addChild(host, VIRTUAL_CURSOR_POSITION);
info.addChild(host, VIRTUAL_CURSOR_NEXT);
break;
default:
info.setParent(host);
info.setSource(host, virtualDescendantId);
info.setVisibleToUser(true);
info.setPackageName(GeckoApp.mAppContext.getPackageName());
info.setClassName(host.getClass().getName());
info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
break;
}
return info;
}
@Override
public boolean performAction (int virtualViewId, int action, Bundle arguments) {
if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS) {
// The accessibility focus is permanently on the middle node, VIRTUAL_CURSOR_POSITION.
// When accessibility focus is requested on one of its siblings we move the virtual cursor
// either forward or backward depending on which sibling was selected.
switch (virtualViewId) {
case VIRTUAL_CURSOR_PREVIOUS:
GeckoAppShell.
sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:PreviousObject", null));
return true;
case VIRTUAL_CURSOR_NEXT:
GeckoAppShell.
sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:NextObject", null));
return true;
default:
break;
}
}
return host.performAccessibilityAction(action, arguments);
}
};
return mAccessibilityNodeProvider;
}
}
}