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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 package com.android.settings.users;
     17 
     18 import android.content.Context;
     19 import android.provider.Settings.Global;
     20 import android.support.v7.preference.Preference;
     21 
     22 import com.android.settings.core.PreferenceControllerMixin;
     23 import com.android.settingslib.RestrictedSwitchPreference;
     24 import com.android.settingslib.core.AbstractPreferenceController;
     25 import com.android.settingslib.core.lifecycle.Lifecycle;
     26 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     27 import com.android.settingslib.core.lifecycle.events.OnPause;
     28 import com.android.settingslib.core.lifecycle.events.OnResume;
     29 
     30 public class AddUserWhenLockedPreferenceController extends AbstractPreferenceController
     31         implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener,
     32         LifecycleObserver, OnPause, OnResume {
     33 
     34     private final String mPrefKey;
     35     private final UserCapabilities mUserCaps;
     36     private boolean mShouldUpdateUserList;
     37 
     38     public AddUserWhenLockedPreferenceController(Context context, String key, Lifecycle lifecycle) {
     39         super(context);
     40         mPrefKey = key;
     41         mUserCaps = UserCapabilities.create(context);
     42         if (lifecycle != null) {
     43             lifecycle.addObserver(this);
     44         }
     45     }
     46 
     47     @Override
     48     public void updateState(Preference preference) {
     49         RestrictedSwitchPreference restrictedSwitchPreference =
     50                 (RestrictedSwitchPreference) preference;
     51         int value = Global.getInt(mContext.getContentResolver(), Global.ADD_USERS_WHEN_LOCKED, 0);
     52         restrictedSwitchPreference.setChecked(value == 1);
     53         restrictedSwitchPreference.setDisabledByAdmin(
     54                 mUserCaps.disallowAddUser() ? mUserCaps.getEnforcedAdmin() : null);
     55     }
     56 
     57     @Override
     58     public boolean onPreferenceChange(Preference preference, Object newValue) {
     59         Boolean value = (Boolean) newValue;
     60         Global.putInt(mContext.getContentResolver(),
     61                 Global.ADD_USERS_WHEN_LOCKED, value != null && value ? 1 : 0);
     62         return true;
     63     }
     64 
     65     @Override
     66     public void onPause() {
     67         mShouldUpdateUserList = true;
     68     }
     69 
     70     @Override
     71     public void onResume() {
     72         if (mShouldUpdateUserList) {
     73             mUserCaps.updateAddUserCapabilities(mContext);
     74         }
     75     }
     76 
     77     @Override
     78     public boolean isAvailable() {
     79         return mUserCaps.isAdmin() &&
     80                 (!mUserCaps.disallowAddUser() || mUserCaps.disallowAddUserSetByAdmin());
     81     }
     82 
     83     @Override
     84     public String getPreferenceKey() {
     85         return mPrefKey;
     86     }
     87 }
     88