1 /*
2  * Copyright (C) 2021 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.accessibility;
18 
19 import android.content.Context;
20 import android.provider.Settings;
21 
22 import androidx.annotation.MainThread;
23 import androidx.annotation.Nullable;
24 
25 import com.android.systemui.dagger.SysUISingleton;
26 import com.android.systemui.settings.UserTracker;
27 
28 import javax.inject.Inject;
29 
30 /**
31  * Controller for tracking the current accessibility button list.
32  *
33  * @see Settings.Secure#ACCESSIBILITY_BUTTON_TARGETS
34  */
35 @MainThread
36 @SysUISingleton
37 public class AccessibilityButtonTargetsObserver extends
38         SecureSettingsContentObserver<AccessibilityButtonTargetsObserver.TargetsChangedListener> {
39 
40     /** Listener for accessibility button targets changes. */
41     public interface TargetsChangedListener {
42 
43         /**
44          * Called when accessibility button targets changes.
45          *
46          * @param targets Current content of {@link Settings.Secure#ACCESSIBILITY_BUTTON_TARGETS}
47          */
onAccessibilityButtonTargetsChanged(String targets)48         void onAccessibilityButtonTargetsChanged(String targets);
49     }
50 
51     @Inject
AccessibilityButtonTargetsObserver(Context context, UserTracker userTracker)52     public AccessibilityButtonTargetsObserver(Context context, UserTracker userTracker) {
53         super(context, userTracker, Settings.Secure.ACCESSIBILITY_BUTTON_TARGETS);
54     }
55 
56     @Override
onValueChanged(TargetsChangedListener listener, String value)57     void onValueChanged(TargetsChangedListener listener, String value) {
58         listener.onAccessibilityButtonTargetsChanged(value);
59     }
60 
61     /** Returns the current string from settings key
62      *  {@link Settings.Secure#ACCESSIBILITY_BUTTON_TARGETS}. */
63     @Nullable
getCurrentAccessibilityButtonTargets()64     public String getCurrentAccessibilityButtonTargets() {
65         return getSettingsValue();
66     }
67 }
68