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      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.util.Log;
     21 import android.view.accessibility.AccessibilityManager;
     22 
     23 import java.io.FileDescriptor;
     24 import java.io.PrintWriter;
     25 import java.util.ArrayList;
     26 
     27 public class AccessibilityController implements
     28         AccessibilityManager.AccessibilityStateChangeListener,
     29         AccessibilityManager.TouchExplorationStateChangeListener {
     30 
     31     private final ArrayList<AccessibilityStateChangedCallback> mChangeCallbacks = new ArrayList<>();
     32 
     33     private boolean mAccessibilityEnabled;
     34     private boolean mTouchExplorationEnabled;
     35 
     36     public AccessibilityController(Context context) {
     37         AccessibilityManager am =
     38                 (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
     39         am.addTouchExplorationStateChangeListener(this);
     40         am.addAccessibilityStateChangeListener(this);
     41         mAccessibilityEnabled = am.isEnabled();
     42         mTouchExplorationEnabled = am.isTouchExplorationEnabled();
     43     }
     44 
     45     public boolean isAccessibilityEnabled() {
     46         return mAccessibilityEnabled;
     47     }
     48 
     49     public boolean isTouchExplorationEnabled() {
     50         return mTouchExplorationEnabled;
     51     }
     52 
     53     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
     54         pw.println("AccessibilityController state:");
     55         pw.print("  mAccessibilityEnabled="); pw.println(mAccessibilityEnabled);
     56         pw.print("  mTouchExplorationEnabled="); pw.println(mTouchExplorationEnabled);
     57     }
     58 
     59     public void addStateChangedCallback(AccessibilityStateChangedCallback cb) {
     60         mChangeCallbacks.add(cb);
     61         cb.onStateChanged(mAccessibilityEnabled, mTouchExplorationEnabled);
     62     }
     63 
     64     public void removeStateChangedCallback(AccessibilityStateChangedCallback cb) {
     65         mChangeCallbacks.remove(cb);
     66     }
     67 
     68     private void fireChanged() {
     69         final int N = mChangeCallbacks.size();
     70         for (int i = 0; i < N; i++) {
     71             mChangeCallbacks.get(i).onStateChanged(mAccessibilityEnabled, mTouchExplorationEnabled);
     72         }
     73     }
     74 
     75     @Override
     76     public void onAccessibilityStateChanged(boolean enabled) {
     77         mAccessibilityEnabled = enabled;
     78         fireChanged();
     79     }
     80 
     81     @Override
     82     public void onTouchExplorationStateChanged(boolean enabled) {
     83         mTouchExplorationEnabled = enabled;
     84         fireChanged();
     85     }
     86 
     87     public interface AccessibilityStateChangedCallback {
     88         void onStateChanged(boolean accessibilityEnabled, boolean touchExplorationEnabled);
     89     }
     90 }
     91