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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.settings.gestures;
     18 
     19 import android.content.Context;
     20 import android.net.Uri;
     21 import android.provider.Settings;
     22 import android.support.v7.preference.Preference;
     23 import android.support.v7.preference.PreferenceScreen;
     24 
     25 import com.android.settings.applications.assist.AssistSettingObserver;
     26 import com.android.settings.core.lifecycle.Lifecycle;
     27 import com.android.settings.core.lifecycle.events.OnPause;
     28 import com.android.settings.core.lifecycle.events.OnResume;
     29 import com.android.settings.overlay.FeatureFactory;
     30 
     31 import java.util.Arrays;
     32 import java.util.List;
     33 
     34 public class AssistGesturePreferenceController extends GesturePreferenceController
     35         implements OnPause, OnResume {
     36 
     37     private static final String PREF_KEY_VIDEO = "gesture_assist_video";
     38     private final String mAssistGesturePrefKey;
     39 
     40     private final AssistGestureFeatureProvider mFeatureProvider;
     41     private final SettingObserver mSettingObserver;
     42     private boolean mWasAvailable;
     43 
     44     private PreferenceScreen mScreen;
     45     private Preference mPreference;
     46 
     47     public AssistGesturePreferenceController(Context context, Lifecycle lifecycle, String key) {
     48         super(context, lifecycle);
     49         mFeatureProvider = FeatureFactory.getFactory(context).getAssistGestureFeatureProvider();
     50         mSettingObserver = new SettingObserver();
     51         mWasAvailable = isAvailable();
     52         mAssistGesturePrefKey = key;
     53     }
     54 
     55     @Override
     56     public boolean isAvailable() {
     57         return mFeatureProvider.isSupported(mContext);
     58     }
     59 
     60     @Override
     61     public void displayPreference(PreferenceScreen screen) {
     62         mScreen = screen;
     63         mPreference = screen.findPreference(getPreferenceKey());
     64         // Call super last or AbstractPreferenceController might remove the preference from the
     65         // screen (if !isAvailable()) before we can save a reference to it.
     66         super.displayPreference(screen);
     67     }
     68 
     69     @Override
     70     public void onResume() {
     71         mSettingObserver.register(mContext.getContentResolver(), true /* register */);
     72         if (mWasAvailable != isAvailable()) {
     73             // Only update the preference visibility if the availability has changed -- otherwise
     74             // the preference may be incorrectly added to screens with collapsed sections.
     75             updatePreference();
     76             mWasAvailable = isAvailable();
     77         }
     78     }
     79 
     80     @Override
     81     public void onPause() {
     82         mSettingObserver.register(mContext.getContentResolver(), false /* register */);
     83     }
     84 
     85     private void updatePreference() {
     86         if (mPreference == null) {
     87             return;
     88         }
     89 
     90         if (isAvailable()) {
     91             if (mScreen.findPreference(getPreferenceKey()) == null) {
     92                 mScreen.addPreference(mPreference);
     93             }
     94         } else {
     95             mScreen.removePreference(mPreference);
     96         }
     97     }
     98 
     99     @Override
    100     public boolean onPreferenceChange(Preference preference, Object newValue) {
    101         final boolean enabled = (boolean) newValue;
    102         Settings.Secure.putInt(mContext.getContentResolver(),
    103                 Settings.Secure.ASSIST_GESTURE_ENABLED, enabled ? 1 : 0);
    104         return true;
    105     }
    106 
    107     @Override
    108     protected String getVideoPrefKey() {
    109         return PREF_KEY_VIDEO;
    110     }
    111 
    112     @Override
    113     public String getPreferenceKey() {
    114         return mAssistGesturePrefKey;
    115     }
    116 
    117     @Override
    118     protected boolean isSwitchPrefEnabled() {
    119         final int assistGestureEnabled = Settings.Secure.getInt(mContext.getContentResolver(),
    120                 Settings.Secure.ASSIST_GESTURE_ENABLED, 1);
    121         return assistGestureEnabled != 0;
    122     }
    123 
    124     class SettingObserver extends AssistSettingObserver {
    125 
    126         private final Uri ASSIST_GESTURE_ENABLED_URI =
    127                 Settings.Secure.getUriFor(Settings.Secure.ASSIST_GESTURE_ENABLED);
    128 
    129         @Override
    130         protected List<Uri> getSettingUris() {
    131             return Arrays.asList(ASSIST_GESTURE_ENABLED_URI);
    132         }
    133 
    134         @Override
    135         public void onSettingChange() {
    136             if (mWasAvailable != isAvailable()) {
    137                 updatePreference();
    138                 mWasAvailable = isAvailable();
    139             }
    140         }
    141     }
    142 }
    143