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 21 import androidx.preference.Preference; 22 import androidx.preference.PreferenceScreen; 23 24 import com.android.settings.R; 25 import com.android.settings.core.TogglePreferenceController; 26 import com.android.settings.widget.VideoPreference; 27 import com.android.settingslib.core.lifecycle.LifecycleObserver; 28 import com.android.settingslib.core.lifecycle.events.OnStart; 29 import com.android.settingslib.core.lifecycle.events.OnStop; 30 31 public abstract class GesturePreferenceController extends TogglePreferenceController 32 implements Preference.OnPreferenceChangeListener, 33 LifecycleObserver, OnStart, OnStop { 34 35 private VideoPreference mVideoPreference; 36 GesturePreferenceController(Context context, String key)37 public GesturePreferenceController(Context context, String key) { 38 super(context, key); 39 } 40 41 @Override displayPreference(PreferenceScreen screen)42 public void displayPreference(PreferenceScreen screen) { 43 super.displayPreference(screen); 44 if (isAvailable()) { 45 mVideoPreference = screen.findPreference(getVideoPrefKey()); 46 } 47 } 48 49 @Override updateState(Preference preference)50 public void updateState(Preference preference) { 51 super.updateState(preference); 52 if (preference != null) { 53 // Different meanings of "Enabled" for the Preference and Controller. 54 preference.setEnabled(canHandleClicks()); 55 } 56 } 57 58 @Override getSummary()59 public CharSequence getSummary() { 60 return mContext.getText( 61 isChecked() ? R.string.gesture_setting_on : R.string.gesture_setting_off); 62 } 63 64 @Override onStart()65 public void onStart() { 66 if (mVideoPreference != null) { 67 mVideoPreference.onViewVisible(); 68 } 69 } 70 71 @Override onStop()72 public void onStop() { 73 if (mVideoPreference != null) { 74 mVideoPreference.onViewInvisible(); 75 } 76 } 77 getVideoPrefKey()78 protected abstract String getVideoPrefKey(); 79 canHandleClicks()80 protected boolean canHandleClicks() { 81 return true; 82 } 83 } 84