1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.systemui.statusbar.policy; 18 19 import android.content.Context; 20 import android.view.accessibility.AccessibilityManager; 21 22 import java.io.FileDescriptor; 23 import java.io.PrintWriter; 24 import java.util.ArrayList; 25 26 import javax.inject.Inject; 27 import javax.inject.Singleton; 28 29 /** 30 */ 31 @Singleton 32 public class AccessibilityController implements 33 AccessibilityManager.AccessibilityStateChangeListener, 34 AccessibilityManager.TouchExplorationStateChangeListener { 35 36 private final ArrayList<AccessibilityStateChangedCallback> mChangeCallbacks = new ArrayList<>(); 37 38 private boolean mAccessibilityEnabled; 39 private boolean mTouchExplorationEnabled; 40 41 /** 42 */ 43 @Inject AccessibilityController(Context context)44 public AccessibilityController(Context context) { 45 AccessibilityManager am = 46 (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE); 47 am.addTouchExplorationStateChangeListener(this); 48 am.addAccessibilityStateChangeListener(this); 49 mAccessibilityEnabled = am.isEnabled(); 50 mTouchExplorationEnabled = am.isTouchExplorationEnabled(); 51 } 52 isAccessibilityEnabled()53 public boolean isAccessibilityEnabled() { 54 return mAccessibilityEnabled; 55 } 56 isTouchExplorationEnabled()57 public boolean isTouchExplorationEnabled() { 58 return mTouchExplorationEnabled; 59 } 60 dump(FileDescriptor fd, PrintWriter pw, String[] args)61 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 62 pw.println("AccessibilityController state:"); 63 pw.print(" mAccessibilityEnabled="); pw.println(mAccessibilityEnabled); 64 pw.print(" mTouchExplorationEnabled="); pw.println(mTouchExplorationEnabled); 65 } 66 addStateChangedCallback(AccessibilityStateChangedCallback cb)67 public void addStateChangedCallback(AccessibilityStateChangedCallback cb) { 68 mChangeCallbacks.add(cb); 69 cb.onStateChanged(mAccessibilityEnabled, mTouchExplorationEnabled); 70 } 71 removeStateChangedCallback(AccessibilityStateChangedCallback cb)72 public void removeStateChangedCallback(AccessibilityStateChangedCallback cb) { 73 mChangeCallbacks.remove(cb); 74 } 75 fireChanged()76 private void fireChanged() { 77 final int N = mChangeCallbacks.size(); 78 for (int i = 0; i < N; i++) { 79 mChangeCallbacks.get(i).onStateChanged(mAccessibilityEnabled, mTouchExplorationEnabled); 80 } 81 } 82 83 @Override onAccessibilityStateChanged(boolean enabled)84 public void onAccessibilityStateChanged(boolean enabled) { 85 mAccessibilityEnabled = enabled; 86 fireChanged(); 87 } 88 89 @Override onTouchExplorationStateChanged(boolean enabled)90 public void onTouchExplorationStateChanged(boolean enabled) { 91 mTouchExplorationEnabled = enabled; 92 fireChanged(); 93 } 94 95 public interface AccessibilityStateChangedCallback { onStateChanged(boolean accessibilityEnabled, boolean touchExplorationEnabled)96 void onStateChanged(boolean accessibilityEnabled, boolean touchExplorationEnabled); 97 } 98 } 99