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 final Preference pref = screen.findPreference(getVideoPrefKey()); 46 if (pref instanceof VideoPreference) { 47 mVideoPreference = screen.findPreference(getVideoPrefKey()); 48 } 49 } 50 } 51 52 @Override updateState(Preference preference)53 public void updateState(Preference preference) { 54 super.updateState(preference); 55 if (preference != null) { 56 // Different meanings of "Enabled" for the Preference and Controller. 57 preference.setEnabled(canHandleClicks()); 58 } 59 } 60 61 @Override getSummary()62 public CharSequence getSummary() { 63 return mContext.getText( 64 isChecked() ? R.string.gesture_setting_on : R.string.gesture_setting_off); 65 } 66 67 @Override onStart()68 public void onStart() { 69 if (mVideoPreference != null) { 70 mVideoPreference.onViewVisible(); 71 } 72 } 73 74 @Override onStop()75 public void onStop() { 76 if (mVideoPreference != null) { 77 mVideoPreference.onViewInvisible(); 78 } 79 } 80 getVideoPrefKey()81 protected abstract String getVideoPrefKey(); 82 canHandleClicks()83 protected boolean canHandleClicks() { 84 return true; 85 } 86 } 87