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      1 /*
      2  * Copyright (C) 2016 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.os.Bundle;
     21 import android.support.annotation.VisibleForTesting;
     22 import android.support.v7.preference.Preference;
     23 import android.support.v7.preference.PreferenceScreen;
     24 import android.support.v7.preference.TwoStatePreference;
     25 
     26 import com.android.settings.R;
     27 import com.android.settings.core.TogglePreferenceController;
     28 import com.android.settings.widget.VideoPreference;
     29 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     30 import com.android.settingslib.core.lifecycle.events.OnCreate;
     31 import com.android.settingslib.core.lifecycle.events.OnPause;
     32 import com.android.settingslib.core.lifecycle.events.OnResume;
     33 import com.android.settingslib.core.lifecycle.events.OnSaveInstanceState;
     34 
     35 public abstract class GesturePreferenceController extends TogglePreferenceController
     36         implements Preference.OnPreferenceChangeListener,
     37         LifecycleObserver, OnResume, OnPause, OnCreate, OnSaveInstanceState {
     38 
     39     @VisibleForTesting
     40     static final String KEY_VIDEO_PAUSED = "key_video_paused";
     41 
     42     private VideoPreference mVideoPreference;
     43     @VisibleForTesting
     44     boolean mVideoPaused;
     45 
     46     public GesturePreferenceController(Context context, String key) {
     47         super(context, key);
     48     }
     49 
     50     @Override
     51     public void displayPreference(PreferenceScreen screen) {
     52         super.displayPreference(screen);
     53         if (isAvailable()) {
     54             mVideoPreference = (VideoPreference) screen.findPreference(getVideoPrefKey());
     55         }
     56     }
     57 
     58     @Override
     59     public void updateState(Preference preference) {
     60         super.updateState(preference);
     61         if (preference != null) {
     62             // Different meanings of "Enabled" for the Preference and Controller.
     63             preference.setEnabled(canHandleClicks());
     64         }
     65     }
     66 
     67     @Override
     68     public CharSequence getSummary() {
     69         return mContext.getText(
     70                 isChecked() ? R.string.gesture_setting_on : R.string.gesture_setting_off);
     71     }
     72 
     73     @Override
     74     public void onCreate(Bundle savedInstanceState) {
     75         if (savedInstanceState != null) {
     76             mVideoPaused = savedInstanceState.getBoolean(KEY_VIDEO_PAUSED, false);
     77         }
     78     }
     79 
     80     @Override
     81     public void onSaveInstanceState(Bundle outState) {
     82         outState.putBoolean(KEY_VIDEO_PAUSED, mVideoPaused);
     83     }
     84 
     85     @Override
     86     public void onPause() {
     87         if (mVideoPreference != null) {
     88             mVideoPaused = mVideoPreference.isVideoPaused();
     89             mVideoPreference.onViewInvisible();
     90         }
     91     }
     92 
     93     @Override
     94     public void onResume() {
     95         if (mVideoPreference != null) {
     96             mVideoPreference.onViewVisible(mVideoPaused);
     97         }
     98     }
     99 
    100     protected abstract String getVideoPrefKey();
    101 
    102     protected boolean canHandleClicks() {
    103         return true;
    104     }
    105 }
    106