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      1 /*
      2  * Copyright (C) 2017 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.launcher3.util;
     18 
     19 import android.content.ContentResolver;
     20 import android.database.ContentObserver;
     21 import android.os.Handler;
     22 import android.provider.Settings;
     23 
     24 public interface SettingsObserver {
     25 
     26     /**
     27      * Registers the content observer to call {@link #onSettingChanged(boolean)} when any of the
     28      * passed settings change. The value passed to onSettingChanged() is based on the key setting.
     29      */
     30     void register(String keySetting, String ... dependentSettings);
     31     void unregister();
     32     void onSettingChanged(boolean keySettingEnabled);
     33 
     34 
     35     abstract class Secure extends ContentObserver implements SettingsObserver {
     36         private ContentResolver mResolver;
     37         private String mKeySetting;
     38 
     39         public Secure(ContentResolver resolver) {
     40             super(new Handler());
     41             mResolver = resolver;
     42         }
     43 
     44         @Override
     45         public void register(String keySetting, String ... dependentSettings) {
     46             mKeySetting = keySetting;
     47             mResolver.registerContentObserver(
     48                     Settings.Secure.getUriFor(mKeySetting), false, this);
     49             for (String setting : dependentSettings) {
     50                 mResolver.registerContentObserver(
     51                         Settings.Secure.getUriFor(setting), false, this);
     52             }
     53             onChange(true);
     54         }
     55 
     56         @Override
     57         public void unregister() {
     58             mResolver.unregisterContentObserver(this);
     59         }
     60 
     61         @Override
     62         public void onChange(boolean selfChange) {
     63             super.onChange(selfChange);
     64             onSettingChanged(Settings.Secure.getInt(mResolver, mKeySetting, 1) == 1);
     65         }
     66     }
     67 
     68     abstract class System extends ContentObserver implements SettingsObserver {
     69         private ContentResolver mResolver;
     70         private String mKeySetting;
     71 
     72         public System(ContentResolver resolver) {
     73             super(new Handler());
     74             mResolver = resolver;
     75         }
     76 
     77         @Override
     78         public void register(String keySetting, String ... dependentSettings) {
     79             mKeySetting = keySetting;
     80             mResolver.registerContentObserver(
     81                     Settings.System.getUriFor(mKeySetting), false, this);
     82             for (String setting : dependentSettings) {
     83                 mResolver.registerContentObserver(
     84                         Settings.System.getUriFor(setting), false, this);
     85             }
     86             onChange(true);
     87         }
     88 
     89         @Override
     90         public void unregister() {
     91             mResolver.unregisterContentObserver(this);
     92         }
     93 
     94         @Override
     95         public void onChange(boolean selfChange) {
     96             super.onChange(selfChange);
     97             onSettingChanged(Settings.System.getInt(mResolver, mKeySetting, 1) == 1);
     98         }
     99     }
    100 }
    101