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.PreferenceControllerMixin; 28 import com.android.settings.widget.VideoPreference; 29 import com.android.settingslib.core.AbstractPreferenceController; 30 import com.android.settingslib.core.lifecycle.Lifecycle; 31 import com.android.settingslib.core.lifecycle.LifecycleObserver; 32 import com.android.settingslib.core.lifecycle.events.OnCreate; 33 import com.android.settingslib.core.lifecycle.events.OnPause; 34 import com.android.settingslib.core.lifecycle.events.OnResume; 35 import com.android.settingslib.core.lifecycle.events.OnSaveInstanceState; 36 37 public abstract class GesturePreferenceController extends AbstractPreferenceController 38 implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener, 39 LifecycleObserver, OnResume, OnPause, OnCreate, OnSaveInstanceState { 40 41 @VisibleForTesting 42 static final String KEY_VIDEO_PAUSED = "key_video_paused"; 43 44 private VideoPreference mVideoPreference; 45 @VisibleForTesting 46 boolean mVideoPaused; 47 GesturePreferenceController(Context context, Lifecycle lifecycle)48 public GesturePreferenceController(Context context, Lifecycle lifecycle) { 49 super(context); 50 if (lifecycle != null) { 51 lifecycle.addObserver(this); 52 } 53 } 54 55 @Override displayPreference(PreferenceScreen screen)56 public void displayPreference(PreferenceScreen screen) { 57 super.displayPreference(screen); 58 if (isAvailable()) { 59 mVideoPreference = (VideoPreference) screen.findPreference(getVideoPrefKey()); 60 } 61 } 62 63 @Override updateState(Preference preference)64 public void updateState(Preference preference) { 65 super.updateState(preference); 66 final boolean isEnabled = isSwitchPrefEnabled(); 67 if (preference != null) { 68 if (preference instanceof TwoStatePreference) { 69 ((TwoStatePreference) preference).setChecked(isEnabled); 70 } else { 71 preference.setSummary(isEnabled 72 ? R.string.gesture_setting_on 73 : R.string.gesture_setting_off); 74 } 75 // Different meanings of "Enabled" for the Preference and Controller. 76 preference.setEnabled(canHandleClicks()); 77 } 78 } 79 80 @Override onCreate(Bundle savedInstanceState)81 public void onCreate(Bundle savedInstanceState) { 82 if (savedInstanceState != null) { 83 mVideoPaused = savedInstanceState.getBoolean(KEY_VIDEO_PAUSED, false); 84 } 85 } 86 87 @Override onSaveInstanceState(Bundle outState)88 public void onSaveInstanceState(Bundle outState) { 89 outState.putBoolean(KEY_VIDEO_PAUSED, mVideoPaused); 90 } 91 92 @Override onPause()93 public void onPause() { 94 if (mVideoPreference != null) { 95 mVideoPaused = mVideoPreference.isVideoPaused(); 96 mVideoPreference.onViewInvisible(); 97 } 98 } 99 100 @Override onResume()101 public void onResume() { 102 if (mVideoPreference != null) { 103 mVideoPreference.onViewVisible(mVideoPaused); 104 } 105 } 106 getVideoPrefKey()107 protected abstract String getVideoPrefKey(); 108 isSwitchPrefEnabled()109 protected abstract boolean isSwitchPrefEnabled(); 110 canHandleClicks()111 protected boolean canHandleClicks() { 112 return true; 113 } 114 } 115