mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-06 09:05:45 +00:00
391 lines
21 KiB
Java
391 lines
21 KiB
Java
/* -*- 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 org.mozilla.gecko.util.UiAsyncTask;
|
|
|
|
import org.json.JSONArray;
|
|
import org.json.JSONException;
|
|
import org.json.JSONObject;
|
|
|
|
import android.app.ActivityManager;
|
|
import android.app.ActivityManager.RunningServiceInfo;
|
|
import android.content.Context;
|
|
import android.graphics.Rect;
|
|
import android.os.Build;
|
|
import android.os.Bundle;
|
|
import android.util.Log;
|
|
import android.view.View;
|
|
import android.view.accessibility.AccessibilityEvent;
|
|
import android.view.accessibility.AccessibilityManager;
|
|
import android.view.accessibility.AccessibilityNodeInfo;
|
|
import android.view.accessibility.AccessibilityNodeProvider;
|
|
|
|
import com.googlecode.eyesfree.braille.selfbraille.SelfBrailleClient;
|
|
import com.googlecode.eyesfree.braille.selfbraille.WriteData;
|
|
|
|
import java.util.Arrays;
|
|
import java.util.HashSet;
|
|
import java.util.List;
|
|
|
|
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;
|
|
|
|
// This is the number Brailleback uses to start indexing routing keys.
|
|
private static final int BRAILLE_CLICK_BASE_INDEX = -275000000;
|
|
private static SelfBrailleClient sSelfBrailleClient = 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 (final GeckoApp app) {
|
|
new UiAsyncTask<Void, Void, Void>(ThreadUtils.getBackgroundHandler()) {
|
|
@Override
|
|
public Void doInBackground(Void... args) {
|
|
JSONObject ret = new JSONObject();
|
|
sEnabled = false;
|
|
AccessibilityManager accessibilityManager =
|
|
(AccessibilityManager) app.getSystemService(Context.ACCESSIBILITY_SERVICE);
|
|
if (accessibilityManager.isEnabled()) {
|
|
ActivityManager activityManager =
|
|
(ActivityManager) app.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;
|
|
}
|
|
if (sEnabled && sSelfBrailleClient == null &&
|
|
Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
|
|
sSelfBrailleClient = new SelfBrailleClient(GeckoAppShell.getContext(), false);
|
|
}
|
|
}
|
|
|
|
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()));
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public void onPostExecute(Void args) {
|
|
// Disable the dynamic toolbar when enabling accessibility.
|
|
// These features tend not to interact well.
|
|
app.setAccessibilityEnabled(sEnabled);
|
|
}
|
|
}.execute();
|
|
}
|
|
|
|
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(GeckoAppShell.getContext().getPackageName());
|
|
populateEventFromJSON(accEvent, message);
|
|
AccessibilityManager accessibilityManager =
|
|
(AccessibilityManager) GeckoAppShell.getContext().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 = GeckoAppShell.getLayerView();
|
|
if (view == null)
|
|
return;
|
|
|
|
if (sVirtualCursorNode == null)
|
|
sVirtualCursorNode = AccessibilityNodeInfo.obtain(view, VIRTUAL_CURSOR_POSITION);
|
|
sVirtualCursorNode.setEnabled(message.optBoolean("enabled", true));
|
|
sVirtualCursorNode.setClickable(message.optBoolean("clickable"));
|
|
sVirtualCursorNode.setCheckable(message.optBoolean("checkable"));
|
|
sVirtualCursorNode.setChecked(message.optBoolean("checked"));
|
|
sVirtualCursorNode.setPassword(message.optBoolean("password"));
|
|
|
|
final JSONArray textArray = message.optJSONArray("text");
|
|
StringBuilder sb = new StringBuilder();
|
|
if (textArray != null && textArray.length() > 0) {
|
|
sb.append(textArray.optString(0));
|
|
for (int i = 1; i < textArray.length(); i++) {
|
|
sb.append(" ").append(textArray.optString(i));
|
|
}
|
|
}
|
|
sVirtualCursorNode.setText(sb.toString());
|
|
sVirtualCursorNode.setContentDescription(message.optString("description"));
|
|
|
|
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);
|
|
}
|
|
|
|
final JSONObject braille = message.optJSONObject("brailleOutput");
|
|
if (braille != null) {
|
|
sendBrailleText(view, braille.optString("text"),
|
|
braille.optInt("selectionStart"), braille.optInt("selectionEnd"));
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
});
|
|
|
|
}
|
|
}
|
|
|
|
private static void sendBrailleText(final View view, final String text, final int selectionStart, final int selectionEnd) {
|
|
AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(view, VIRTUAL_CURSOR_POSITION);
|
|
WriteData data = WriteData.forInfo(info);
|
|
data.setText(text);
|
|
// Set either the focus blink or the current caret position/selection
|
|
data.setSelectionStart(selectionStart);
|
|
data.setSelectionEnd(selectionEnd);
|
|
sSelfBrailleClient.write(data);
|
|
}
|
|
|
|
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);
|
|
// No matter where the a11y focus is requested, we always force it back to the current vc position.
|
|
event.setSource(host, VIRTUAL_CURSOR_POSITION);
|
|
}
|
|
// 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;
|
|
}
|
|
|
|
@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(GeckoAppShell.getContext().getPackageName());
|
|
info.setClassName(host.getClass().getName());
|
|
info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
|
|
info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
|
|
info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
|
|
info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY);
|
|
info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY);
|
|
info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER |
|
|
AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD |
|
|
AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH);
|
|
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;
|
|
}
|
|
} else if (action == AccessibilityNodeInfo.ACTION_CLICK && virtualViewId == VIRTUAL_CURSOR_POSITION) {
|
|
GeckoAppShell.
|
|
sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:ActivateObject", null));
|
|
return true;
|
|
} else if (action == AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY &&
|
|
virtualViewId == VIRTUAL_CURSOR_POSITION) {
|
|
// XXX: Self brailling gives this action with a bogus argument instead of an actual click action;
|
|
// the argument value is the BRAILLE_CLICK_BASE_INDEX - the index of the routing key that was hit
|
|
int granularity = arguments.getInt(AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
|
|
if (granularity < 0) {
|
|
int keyIndex = BRAILLE_CLICK_BASE_INDEX - granularity;
|
|
JSONObject activationData = new JSONObject();
|
|
try {
|
|
activationData.put("keyIndex", keyIndex);
|
|
} catch (JSONException e) {
|
|
return true;
|
|
}
|
|
GeckoAppShell.
|
|
sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:ActivateObject", activationData.toString()));
|
|
} else {
|
|
JSONObject movementData = new JSONObject();
|
|
try {
|
|
movementData.put("direction", "Next");
|
|
movementData.put("granularity", granularity);
|
|
} catch (JSONException e) {
|
|
return true;
|
|
}
|
|
GeckoAppShell.
|
|
sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:MoveCaret", movementData.toString()));
|
|
}
|
|
return true;
|
|
} else if (action == AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY &&
|
|
virtualViewId == VIRTUAL_CURSOR_POSITION) {
|
|
JSONObject movementData = new JSONObject();
|
|
try {
|
|
movementData.put("direction", "Previous");
|
|
movementData.put("granularity", arguments.getInt(AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT));
|
|
} catch (JSONException e) {
|
|
return true;
|
|
}
|
|
GeckoAppShell.
|
|
sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:MoveCaret", movementData.toString()));
|
|
return true;
|
|
}
|
|
return host.performAccessibilityAction(action, arguments);
|
|
}
|
|
};
|
|
|
|
return mAccessibilityNodeProvider;
|
|
}
|
|
}
|
|
}
|