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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"); you may not use this file
      5  * except in compliance with the License. You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 package com.android.settings.display;
     15 
     16 import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
     17 
     18 import android.app.admin.DevicePolicyManager;
     19 import android.content.Context;
     20 import android.os.UserHandle;
     21 import android.os.UserManager;
     22 import android.provider.Settings;
     23 import android.support.v7.preference.Preference;
     24 import android.util.Log;
     25 
     26 import com.android.settings.R;
     27 import com.android.settings.TimeoutListPreference;
     28 import com.android.settings.core.PreferenceControllerMixin;
     29 import com.android.settingslib.RestrictedLockUtils;
     30 import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
     31 import com.android.settingslib.core.AbstractPreferenceController;
     32 
     33 public class TimeoutPreferenceController extends AbstractPreferenceController implements
     34         PreferenceControllerMixin, Preference.OnPreferenceChangeListener {
     35 
     36     private static final String TAG = "TimeoutPrefContr";
     37 
     38     /** If there is no setting in the provider, use this. */
     39     public static final int FALLBACK_SCREEN_TIMEOUT_VALUE = 30000;
     40 
     41     private final String mScreenTimeoutKey;
     42 
     43     public TimeoutPreferenceController(Context context, String key) {
     44         super(context);
     45         mScreenTimeoutKey = key;
     46     }
     47 
     48     @Override
     49     public boolean isAvailable() {
     50         return true;
     51     }
     52 
     53     @Override
     54     public String getPreferenceKey() {
     55         return mScreenTimeoutKey;
     56     }
     57 
     58     @Override
     59     public void updateState(Preference preference) {
     60         final TimeoutListPreference timeoutListPreference = (TimeoutListPreference) preference;
     61         final long currentTimeout = Settings.System.getLong(mContext.getContentResolver(),
     62                 SCREEN_OFF_TIMEOUT, FALLBACK_SCREEN_TIMEOUT_VALUE);
     63         timeoutListPreference.setValue(String.valueOf(currentTimeout));
     64         final DevicePolicyManager dpm =
     65                 (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
     66         if (dpm != null) {
     67             final RestrictedLockUtils.EnforcedAdmin admin =
     68                     RestrictedLockUtils.checkIfMaximumTimeToLockIsSet(mContext);
     69             final long maxTimeout =
     70                     dpm.getMaximumTimeToLock(null /* admin */, UserHandle.myUserId());
     71             timeoutListPreference.removeUnusableTimeouts(maxTimeout, admin);
     72         }
     73         updateTimeoutPreferenceDescription(timeoutListPreference, currentTimeout);
     74 
     75         EnforcedAdmin admin = RestrictedLockUtils.checkIfRestrictionEnforced(
     76                         mContext, UserManager.DISALLOW_CONFIG_SCREEN_TIMEOUT,
     77                         UserHandle.myUserId());
     78         if(admin != null) {
     79             timeoutListPreference.removeUnusableTimeouts(0/* disable all*/, admin);
     80         }
     81     }
     82 
     83     @Override
     84     public boolean onPreferenceChange(Preference preference, Object newValue) {
     85         try {
     86             int value = Integer.parseInt((String) newValue);
     87             Settings.System.putInt(mContext.getContentResolver(), SCREEN_OFF_TIMEOUT, value);
     88             updateTimeoutPreferenceDescription((TimeoutListPreference) preference, value);
     89         } catch (NumberFormatException e) {
     90             Log.e(TAG, "could not persist screen timeout setting", e);
     91         }
     92         return true;
     93     }
     94 
     95     public static CharSequence getTimeoutDescription(
     96             long currentTimeout, CharSequence[] entries, CharSequence[] values) {
     97         if (currentTimeout < 0 || entries == null || values == null
     98                 || values.length != entries.length) {
     99             return null;
    100         }
    101 
    102         for (int i = 0; i < values.length; i++) {
    103             long timeout = Long.parseLong(values[i].toString());
    104             if (currentTimeout == timeout) {
    105                 return entries[i];
    106             }
    107         }
    108         return null;
    109     }
    110 
    111     private void updateTimeoutPreferenceDescription(TimeoutListPreference preference,
    112             long currentTimeout) {
    113         final CharSequence[] entries = preference.getEntries();
    114         final CharSequence[] values = preference.getEntryValues();
    115         final String summary;
    116         if (preference.isDisabledByAdmin()) {
    117             summary = mContext.getString(com.android.settings.R.string.disabled_by_policy_title);
    118         } else {
    119             final CharSequence timeoutDescription = getTimeoutDescription(
    120                     currentTimeout, entries, values);
    121             summary = timeoutDescription == null
    122                     ? ""
    123                     : mContext.getString(R.string.screen_timeout_summary, timeoutDescription);
    124         }
    125         preference.setSummary(summary);
    126     }
    127 
    128 }
    129