mirror of
https://github.com/mozilla/gecko-dev.git
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283 lines
14 KiB
Java
283 lines
14 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko;
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import org.mozilla.gecko.gfx.LayerView;
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import android.view.accessibility.*;
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import android.view.View;
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import android.util.Log;
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import android.os.Build;
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import android.os.Bundle;
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import android.content.Context;
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import android.graphics.Rect;
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import android.app.ActivityManager;
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import android.app.ActivityManager.RunningServiceInfo;
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import java.util.HashSet;
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import java.util.Arrays;
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import java.util.List;
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import org.json.*;
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public class GeckoAccessibility {
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private static final String LOGTAG = "GeckoAccessibility";
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private static final int VIRTUAL_CURSOR_PREVIOUS = 1;
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private static final int VIRTUAL_CURSOR_POSITION = 2;
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private static final int VIRTUAL_CURSOR_NEXT = 3;
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private static boolean sEnabled = false;
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private static JSONObject sEventMessage = null;
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private static AccessibilityNodeInfo sVirtualCursorNode = null;
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private static final HashSet<String> sServiceWhitelist =
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new HashSet<String>(Arrays.asList(new String[] {
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"com.google.android.marvin.talkback.TalkBackService", // Google Talkback screen reader
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"com.mot.readout.ScreenReader", // Motorola screen reader
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"info.spielproject.spiel.SpielService", // Spiel screen reader
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"es.codefactory.android.app.ma.MAAccessibilityService" // Codefactory Mobile Accessibility screen reader
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}));
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public static void updateAccessibilitySettings () {
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GeckoAppShell.getHandler().post(new Runnable() {
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public void run() {
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JSONObject ret = new JSONObject();
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sEnabled = false;
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AccessibilityManager accessibilityManager =
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(AccessibilityManager) GeckoApp.mAppContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
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if (accessibilityManager.isEnabled()) {
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ActivityManager activityManager =
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(ActivityManager) GeckoApp.mAppContext.getSystemService(Context.ACTIVITY_SERVICE);
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List<RunningServiceInfo> runningServices = activityManager.getRunningServices(Integer.MAX_VALUE);
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for (RunningServiceInfo runningServiceInfo : runningServices) {
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sEnabled = sServiceWhitelist.contains(runningServiceInfo.service.getClassName());
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if (sEnabled)
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break;
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}
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}
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try {
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ret.put("enabled", sEnabled);
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} catch (Exception ex) {
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Log.e(LOGTAG, "Error building JSON arguments for Accessibility:Settings:", ex);
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}
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GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:Settings",
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ret.toString()));
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}
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});
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}
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private static void populateEventFromJSON (AccessibilityEvent event, JSONObject message) {
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final JSONArray textArray = message.optJSONArray("text");
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if (textArray != null) {
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for (int i = 0; i < textArray.length(); i++)
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event.getText().add(textArray.optString(i));
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}
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event.setContentDescription(message.optString("description"));
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event.setEnabled(message.optBoolean("enabled", true));
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event.setChecked(message.optBoolean("checked"));
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event.setPassword(message.optBoolean("password"));
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event.setAddedCount(message.optInt("addedCount", -1));
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event.setRemovedCount(message.optInt("removedCount", -1));
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event.setFromIndex(message.optInt("fromIndex", -1));
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event.setItemCount(message.optInt("itemCount", -1));
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event.setCurrentItemIndex(message.optInt("currentItemIndex", -1));
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event.setBeforeText(message.optString("beforeText"));
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
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event.setToIndex(message.optInt("toIndex", -1));
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event.setScrollable(message.optBoolean("scrollable"));
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event.setScrollX(message.optInt("scrollX", -1));
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event.setScrollY(message.optInt("scrollY", -1));
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}
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
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event.setMaxScrollX(message.optInt("maxScrollX", -1));
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event.setMaxScrollY(message.optInt("maxScrollY", -1));
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}
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}
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private static void sendDirectAccessibilityEvent(int eventType, JSONObject message) {
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final AccessibilityEvent accEvent = AccessibilityEvent.obtain(eventType);
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accEvent.setClassName(GeckoAccessibility.class.getName());
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accEvent.setPackageName(GeckoApp.mAppContext.getPackageName());
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populateEventFromJSON(accEvent, message);
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AccessibilityManager accessibilityManager =
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(AccessibilityManager) GeckoApp.mAppContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
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try {
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accessibilityManager.sendAccessibilityEvent(accEvent);
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} catch (IllegalStateException e) {
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// Accessibility is off.
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}
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}
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public static void sendAccessibilityEvent (final JSONObject message) {
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if (!sEnabled)
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return;
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final int eventType = message.optInt("eventType", -1);
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if (eventType < 0) {
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Log.e(LOGTAG, "No accessibility event type provided");
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return;
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}
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if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
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// Before Jelly Bean we send events directly from here while spoofing the source by setting
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// the package and class name manually.
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GeckoAppShell.getHandler().post(new Runnable() {
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public void run() {
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sendDirectAccessibilityEvent(eventType, message);
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}
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});
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} else {
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// In Jelly Bean we populate an AccessibilityNodeInfo with the minimal amount of data to have
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// it work with TalkBack.
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final LayerView view = GeckoApp.mAppContext.getLayerView();
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if (view == null)
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return;
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if (sVirtualCursorNode == null)
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sVirtualCursorNode = AccessibilityNodeInfo.obtain(view, VIRTUAL_CURSOR_POSITION);
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sVirtualCursorNode.setEnabled(message.optBoolean("enabled", true));
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sVirtualCursorNode.setChecked(message.optBoolean("checked"));
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sVirtualCursorNode.setPassword(message.optBoolean("password"));
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JSONObject bounds = message.optJSONObject("bounds");
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if (bounds != null) {
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Rect relativeBounds = new Rect(bounds.optInt("left"), bounds.optInt("top"),
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bounds.optInt("right"), bounds.optInt("bottom"));
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sVirtualCursorNode.setBoundsInParent(relativeBounds);
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int[] locationOnScreen = new int[2];
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view.getLocationOnScreen(locationOnScreen);
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Rect screenBounds = new Rect(relativeBounds);
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screenBounds.offset(locationOnScreen[0], locationOnScreen[1]);
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sVirtualCursorNode.setBoundsInScreen(screenBounds);
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}
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// Store the JSON message and use it to populate the event later in the code path.
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sEventMessage = message;
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GeckoApp.mAppContext.mMainHandler.post(new Runnable() {
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public void run() {
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// If this is an accessibility focus, a lot of internal voodoo happens so we perform an
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// accessibility focus action on the view, and it in turn sends the right events.
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switch (eventType) {
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case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED:
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view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
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break;
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case AccessibilityEvent.TYPE_ANNOUNCEMENT:
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case AccessibilityEvent.TYPE_VIEW_SCROLLED:
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final AccessibilityEvent accEvent = AccessibilityEvent.obtain(eventType);
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view.onInitializeAccessibilityEvent(accEvent);
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populateEventFromJSON(accEvent, message);
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view.getParent().requestSendAccessibilityEvent(view, accEvent);
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break;
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default:
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view.sendAccessibilityEvent(eventType);
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break;
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}
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}
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});
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}
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}
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public static void setDelegate(LayerView layerview) {
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// Only use this delegate in Jelly Bean.
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
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layerview.setAccessibilityDelegate(new GeckoAccessibilityDelegate());
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layerview.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
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}
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}
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public static void onLayerViewFocusChanged(LayerView layerview, boolean gainFocus) {
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if (sEnabled)
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GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:Focus",
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gainFocus ? "true" : "false"));
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}
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public static class GeckoAccessibilityDelegate extends View.AccessibilityDelegate {
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AccessibilityNodeProvider mAccessibilityNodeProvider;
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@Override
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public void onPopulateAccessibilityEvent (View host, AccessibilityEvent event) {
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super.onPopulateAccessibilityEvent(host, event);
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if (sEventMessage != null)
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populateEventFromJSON(event, sEventMessage);
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// We save the hover enter event so that we could reuse it for a subsequent accessibility focus event.
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if (event.getEventType() != AccessibilityEvent.TYPE_VIEW_HOVER_ENTER)
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sEventMessage = null;
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// No matter where the a11y focus is requested, we always force it back to the current vc position.
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event.setSource(host, VIRTUAL_CURSOR_POSITION);
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}
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@Override
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public AccessibilityNodeProvider getAccessibilityNodeProvider(final View host) {
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if (mAccessibilityNodeProvider == null)
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// The accessibility node structure for web content consists of 3 LayerView child nodes:
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// 1. VIRTUAL_CURSOR_PREVIOUS: Represents the virtual cursor position that is previous to the
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// current one.
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// 2. VIRTUAL_CURSOR_POSITION: Represents the current position of the virtual cursor.
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// 3. VIRTUAL_CURSOR_NEXT: Represents the next virtual cursor position.
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mAccessibilityNodeProvider = new AccessibilityNodeProvider() {
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@Override
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public AccessibilityNodeInfo createAccessibilityNodeInfo(int virtualDescendantId) {
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AccessibilityNodeInfo info = (virtualDescendantId == VIRTUAL_CURSOR_POSITION && sVirtualCursorNode != null) ?
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AccessibilityNodeInfo.obtain(sVirtualCursorNode) :
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AccessibilityNodeInfo.obtain(host, virtualDescendantId);
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switch (virtualDescendantId) {
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case View.NO_ID:
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// This is the parent LayerView node, populate it with children.
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onInitializeAccessibilityNodeInfo(host, info);
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info.addChild(host, VIRTUAL_CURSOR_PREVIOUS);
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info.addChild(host, VIRTUAL_CURSOR_POSITION);
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info.addChild(host, VIRTUAL_CURSOR_NEXT);
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break;
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default:
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info.setParent(host);
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info.setSource(host, virtualDescendantId);
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info.setVisibleToUser(true);
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info.setPackageName(GeckoApp.mAppContext.getPackageName());
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info.setClassName(host.getClass().getName());
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info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
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info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
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info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
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break;
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}
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return info;
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}
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@Override
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public boolean performAction (int virtualViewId, int action, Bundle arguments) {
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if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS) {
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// The accessibility focus is permanently on the middle node, VIRTUAL_CURSOR_POSITION.
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// When accessibility focus is requested on one of its siblings we move the virtual cursor
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// either forward or backward depending on which sibling was selected.
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switch (virtualViewId) {
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case VIRTUAL_CURSOR_PREVIOUS:
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GeckoAppShell.
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sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:PreviousObject", null));
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return true;
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case VIRTUAL_CURSOR_NEXT:
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GeckoAppShell.
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sendEventToGecko(GeckoEvent.createBroadcastEvent("Accessibility:NextObject", null));
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return true;
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default:
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break;
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}
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}
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return host.performAccessibilityAction(action, arguments);
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}
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};
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return mAccessibilityNodeProvider;
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}
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}
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}
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