1/*
2 * Copyright (C) 2010 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;
18
19import android.preference.Preference;
20import android.preference.PreferenceCategory;
21import android.preference.PreferenceGroup;
22import android.speech.tts.TtsEngines;
23
24import com.android.settings.voice.VoiceInputHelper;
25
26/**
27 * Settings screen for voice input/output.
28 */
29public class VoiceInputOutputSettings {
30
31    private static final String TAG = "VoiceInputOutputSettings";
32
33    private static final String KEY_VOICE_CATEGORY = "voice_category";
34    private static final String KEY_TTS_SETTINGS = "tts_settings";
35
36    private PreferenceGroup mParent;
37    private PreferenceCategory mVoiceCategory;
38    private Preference mVoiceInputSettingsPref;
39    private Preference mTtsSettingsPref;
40    private final SettingsPreferenceFragment mFragment;
41    private final TtsEngines mTtsEngines;
42
43    public VoiceInputOutputSettings(SettingsPreferenceFragment fragment) {
44        mFragment = fragment;
45        mTtsEngines = new TtsEngines(fragment.getPreferenceScreen().getContext());
46    }
47
48    public void onCreate() {
49        mParent = mFragment.getPreferenceScreen();
50        mVoiceCategory = (PreferenceCategory) mParent.findPreference(KEY_VOICE_CATEGORY);
51        mTtsSettingsPref = mVoiceCategory.findPreference(KEY_TTS_SETTINGS);
52
53        populateOrRemovePreferences();
54    }
55
56    private void populateOrRemovePreferences() {
57        boolean hasTtsPrefs = populateOrRemoveTtsPrefs();
58        if (!hasTtsPrefs) {
59            // There were no TTS settings and no recognizer settings,
60            // so it should be safe to hide the preference category
61            // entirely.
62            mFragment.getPreferenceScreen().removePreference(mVoiceCategory);
63        }
64    }
65
66    private boolean populateOrRemoveTtsPrefs() {
67        if (mTtsEngines.getEngines().isEmpty()) {
68            mVoiceCategory.removePreference(mTtsSettingsPref);
69            return false;
70        }
71
72        return true;
73    }
74}
75