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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 
     17 package com.android.settings.language;
     18 
     19 import android.app.Fragment;
     20 import android.content.Context;
     21 import android.os.Bundle;
     22 import android.support.v7.preference.Preference;
     23 
     24 import com.android.settings.core.PreferenceControllerMixin;
     25 import com.android.settings.inputmethod.UserDictionaryList;
     26 import com.android.settings.inputmethod.UserDictionarySettings;
     27 import com.android.settingslib.core.AbstractPreferenceController;
     28 
     29 import java.util.TreeSet;
     30 
     31 public class UserDictionaryPreferenceController extends AbstractPreferenceController
     32         implements PreferenceControllerMixin {
     33 
     34     private static final String KEY_USER_DICTIONARY_SETTINGS = "key_user_dictionary_settings";
     35 
     36     public UserDictionaryPreferenceController(Context context) {
     37         super(context);
     38     }
     39 
     40     @Override
     41     public boolean isAvailable() {
     42         return true;
     43     }
     44 
     45     @Override
     46     public String getPreferenceKey() {
     47         return KEY_USER_DICTIONARY_SETTINGS;
     48     }
     49 
     50     @Override
     51     public void updateState(Preference preference) {
     52         if (!isAvailable() || preference == null) {
     53             return;
     54         }
     55         final TreeSet<String> localeSet = getDictionaryLocales();
     56         final Bundle extras = preference.getExtras();
     57         final Class<? extends Fragment> targetFragment;
     58         if (localeSet.size() <= 1) {
     59             if (!localeSet.isEmpty()) {
     60                 // If the size of localeList is 0, we don't set the locale
     61                 // parameter in the extras. This will be interpreted by the
     62                 // UserDictionarySettings class as meaning
     63                 // "the current locale". Note that with the current code for
     64                 // UserDictionaryList#getUserDictionaryLocalesSet()
     65                 // the locale list always has at least one element, since it
     66                 // always includes the current locale explicitly.
     67                 // @see UserDictionaryList.getUserDictionaryLocalesSet().
     68                 extras.putString("locale", localeSet.first());
     69             }
     70             targetFragment = UserDictionarySettings.class;
     71         } else {
     72             targetFragment = UserDictionaryList.class;
     73         }
     74         preference.setFragment(targetFragment.getCanonicalName());
     75     }
     76 
     77     protected TreeSet<String> getDictionaryLocales() {
     78         return UserDictionaryList.getUserDictionaryLocalesSet(mContext);
     79     }
     80 }
     81