1 /* 2 * Copyright (C) 2024 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.car.settings.common; 18 19 import android.car.drivingstate.CarUxRestrictions; 20 import android.content.Context; 21 22 import androidx.preference.Preference; 23 import androidx.preference.PreferenceCategory; 24 import androidx.preference.PreferenceGroup; 25 26 /** 27 * A controller for Preference categories. 28 */ 29 public class PreferenceCategoryController extends PreferenceController<PreferenceCategory> { 30 PreferenceCategoryController(Context context, String preferenceKey, FragmentController fragmentController, CarUxRestrictions uxRestrictions)31 public PreferenceCategoryController(Context context, String preferenceKey, 32 FragmentController fragmentController, 33 CarUxRestrictions uxRestrictions) { 34 super(context, preferenceKey, fragmentController, uxRestrictions); 35 } 36 37 @Override getPreferenceType()38 protected Class<PreferenceCategory> getPreferenceType() { 39 return PreferenceCategory.class; 40 } 41 42 @Override getDefaultAvailabilityStatus()43 protected int getDefaultAvailabilityStatus() { 44 if (getPreference().getPreferenceCount() == 0) { 45 return CONDITIONALLY_UNAVAILABLE; 46 } 47 48 int count = getVisibleChildrenCount(getPreference()); 49 if (count == 0) { 50 return CONDITIONALLY_UNAVAILABLE; 51 } 52 53 return AVAILABLE; 54 } 55 getVisibleChildrenCount(PreferenceGroup preferenceGroup)56 private int getVisibleChildrenCount(PreferenceGroup preferenceGroup) { 57 int preferenceCount = 0; 58 for (int i = 0; i < preferenceGroup.getPreferenceCount(); i++) { 59 Preference preference = preferenceGroup.getPreference(i); 60 if (preference instanceof PreferenceGroup) { 61 preferenceCount += getVisibleChildrenCount((PreferenceGroup) preference); 62 } else if (preference.isVisible()) { 63 preferenceCount++; 64 } 65 } 66 return preferenceCount; 67 } 68 } 69