1/*
2 * Copyright (C) 2011 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
17package com.android.settings.inputmethod;
18
19import com.android.settings.R;
20import com.android.settings.SettingsPreferenceFragment;
21import com.android.settings.Utils;
22
23import android.app.Activity;
24import android.content.Context;
25import android.content.Intent;
26import android.database.Cursor;
27import android.os.Bundle;
28import android.preference.Preference;
29import android.preference.PreferenceGroup;
30import android.provider.UserDictionary;
31import android.text.TextUtils;
32import android.view.inputmethod.InputMethodInfo;
33import android.view.inputmethod.InputMethodManager;
34import android.view.inputmethod.InputMethodSubtype;
35
36import java.util.List;
37import java.util.Locale;
38import java.util.TreeSet;
39
40public class UserDictionaryList extends SettingsPreferenceFragment {
41    public static final String USER_DICTIONARY_SETTINGS_INTENT_ACTION =
42            "android.settings.USER_DICTIONARY_SETTINGS";
43    private String mLocale;
44
45    @Override
46    public void onCreate(Bundle icicle) {
47        super.onCreate(icicle);
48        setPreferenceScreen(getPreferenceManager().createPreferenceScreen(getActivity()));
49        getActivity().getActionBar().setTitle(R.string.user_dict_settings_title);
50    }
51
52    @Override
53    public void onActivityCreated(Bundle savedInstanceState) {
54        super.onActivityCreated(savedInstanceState);
55
56        final Intent intent = getActivity().getIntent();
57        final String localeFromIntent =
58                null == intent ? null : intent.getStringExtra("locale");
59
60        final Bundle arguments = getArguments();
61        final String localeFromArguments =
62                null == arguments ? null : arguments.getString("locale");
63
64        final String locale;
65        if (null != localeFromArguments) {
66            locale = localeFromArguments;
67        } else if (null != localeFromIntent) {
68            locale = localeFromIntent;
69        } else {
70            locale = null;
71        }
72        mLocale = locale;
73    }
74
75    public static TreeSet<String> getUserDictionaryLocalesSet(Context context) {
76        final Cursor cursor = context.getContentResolver().query(
77                UserDictionary.Words.CONTENT_URI, new String[] { UserDictionary.Words.LOCALE },
78                null, null, null);
79        final TreeSet<String> localeSet = new TreeSet<String>();
80        if (null == cursor) {
81            // The user dictionary service is not present or disabled. Return null.
82            return null;
83        }
84        try {
85            if (cursor.moveToFirst()) {
86                final int columnIndex = cursor.getColumnIndex(UserDictionary.Words.LOCALE);
87                do {
88                    final String locale = cursor.getString(columnIndex);
89                    localeSet.add(null != locale ? locale : "");
90                } while (cursor.moveToNext());
91            }
92        } finally {
93            cursor.close();
94        }
95
96        // CAVEAT: Keep this for consistency of the implementation between Keyboard and Settings
97        // if (!UserDictionarySettings.IS_SHORTCUT_API_SUPPORTED) {
98        //     // For ICS, we need to show "For all languages" in case that the keyboard locale
99        //     // is different from the system locale
100        //     localeSet.add("");
101        // }
102
103        final InputMethodManager imm =
104                (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
105        final List<InputMethodInfo> imis = imm.getEnabledInputMethodList();
106        for (final InputMethodInfo imi : imis) {
107            final List<InputMethodSubtype> subtypes =
108                    imm.getEnabledInputMethodSubtypeList(
109                            imi, true /* allowsImplicitlySelectedSubtypes */);
110            for (InputMethodSubtype subtype : subtypes) {
111                final String locale = subtype.getLocale();
112                if (!TextUtils.isEmpty(locale)) {
113                    localeSet.add(locale);
114                }
115            }
116        }
117
118        // We come here after we have collected locales from existing user dictionary entries and
119        // enabled subtypes. If we already have the locale-without-country version of the system
120        // locale, we don't add the system locale to avoid confusion even though it's technically
121        // correct to add it.
122        if (!localeSet.contains(Locale.getDefault().getLanguage().toString())) {
123            localeSet.add(Locale.getDefault().toString());
124        }
125
126        return localeSet;
127    }
128
129    /**
130     * Creates the entries that allow the user to go into the user dictionary for each locale.
131     * @param userDictGroup The group to put the settings in.
132     */
133    protected void createUserDictSettings(PreferenceGroup userDictGroup) {
134        final Activity activity = getActivity();
135        userDictGroup.removeAll();
136        final TreeSet<String> localeSet =
137                UserDictionaryList.getUserDictionaryLocalesSet(activity);
138        if (mLocale != null) {
139            // If the caller explicitly specify empty string as a locale, we'll show "all languages"
140            // in the list.
141            localeSet.add(mLocale);
142        }
143        if (localeSet.size() > 1) {
144            // Have an "All languages" entry in the languages list if there are two or more active
145            // languages
146            localeSet.add("");
147        }
148
149        if (localeSet.isEmpty()) {
150            userDictGroup.addPreference(createUserDictionaryPreference(null, activity));
151        } else {
152            for (String locale : localeSet) {
153                userDictGroup.addPreference(createUserDictionaryPreference(locale, activity));
154            }
155        }
156    }
157
158    /**
159     * Create a single User Dictionary Preference object, with its parameters set.
160     * @param locale The locale for which this user dictionary is for.
161     * @return The corresponding preference.
162     */
163    protected Preference createUserDictionaryPreference(String locale, Activity activity) {
164        final Preference newPref = new Preference(getActivity());
165        final Intent intent = new Intent(USER_DICTIONARY_SETTINGS_INTENT_ACTION);
166        if (null == locale) {
167            newPref.setTitle(Locale.getDefault().getDisplayName());
168        } else {
169            if ("".equals(locale))
170                newPref.setTitle(getString(R.string.user_dict_settings_all_languages));
171            else
172                newPref.setTitle(Utils.createLocaleFromString(locale).getDisplayName());
173            intent.putExtra("locale", locale);
174            newPref.getExtras().putString("locale", locale);
175        }
176        newPref.setIntent(intent);
177        newPref.setFragment(com.android.settings.UserDictionarySettings.class.getName());
178        return newPref;
179    }
180
181    @Override
182    public void onResume() {
183        super.onResume();
184        createUserDictSettings(getPreferenceScreen());
185    }
186}
187