1/*
2 * Copyright (C) 2015 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.tv.settings.system;
18
19import android.app.AlertDialog;
20import android.content.Context;
21import android.content.DialogInterface;
22import android.speech.tts.TextToSpeech;
23import android.support.v7.preference.Preference;
24import android.support.v7.preference.PreferenceViewHolder;
25import android.util.Log;
26import android.widget.Checkable;
27import android.widget.RadioButton;
28
29import com.android.tv.settings.R;
30
31public class TtsEnginePreference extends Preference {
32
33    private static final String TAG = "TtsEnginePreference";
34
35    /**
36     * The engine information for the engine this preference represents.
37     * Contains it's name, label etc. which are used for display.
38     */
39    private final TextToSpeech.EngineInfo mEngineInfo;
40
41    /**
42     * The shared radio button state, which button is checked etc.
43     */
44    private final RadioButtonGroupState mSharedState;
45
46    private RadioButton mRadioButton;
47
48    public TtsEnginePreference(Context context, TextToSpeech.EngineInfo info,
49            RadioButtonGroupState state) {
50        super(context);
51        setWidgetLayoutResource(R.layout.radio_preference_widget);
52
53        mSharedState = state;
54        mEngineInfo = info;
55
56        setKey(mEngineInfo.name);
57        setTitle(mEngineInfo.label);
58    }
59
60    @Override
61    public void onBindViewHolder(PreferenceViewHolder viewHolder) {
62        super.onBindViewHolder(viewHolder);
63
64        final RadioButton rb = (RadioButton) viewHolder.findViewById(android.R.id.checkbox);
65
66        boolean isChecked = getKey().equals(mSharedState.getCurrentKey());
67        if (isChecked) {
68            mSharedState.setCurrentChecked(rb);
69        }
70
71        rb.setChecked(isChecked);
72
73        mRadioButton = rb;
74    }
75
76    @Override
77    protected void onClick() {
78        super.onClick();
79        onRadioButtonClicked(mRadioButton, !mRadioButton.isChecked());
80    }
81
82    private boolean shouldDisplayDataAlert() {
83        return !mEngineInfo.system;
84    }
85
86    private void displayDataAlert(
87            DialogInterface.OnClickListener positiveOnClickListener,
88            DialogInterface.OnClickListener negativeOnClickListener) {
89        // TODO: don't use phone UI
90        Log.i(TAG, "Displaying data alert for :" + mEngineInfo.name);
91
92        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
93        builder.setTitle(android.R.string.dialog_alert_title)
94                .setMessage(getContext().getString(
95                        R.string.tts_engine_security_warning, mEngineInfo.label))
96                .setCancelable(true)
97                .setPositiveButton(android.R.string.ok, positiveOnClickListener)
98                .setNegativeButton(android.R.string.cancel, negativeOnClickListener);
99
100        AlertDialog dialog = builder.create();
101        dialog.show();
102    }
103
104    private void onRadioButtonClicked(final Checkable buttonView,
105            boolean isChecked) {
106        if (mSharedState.getCurrentChecked() == buttonView) {
107            return;
108        }
109
110        if (isChecked) {
111            // Should we alert user? if that's true, delay making engine current one.
112            if (shouldDisplayDataAlert()) {
113                displayDataAlert(
114                        new DialogInterface.OnClickListener() {
115                            @Override
116                            public void onClick(DialogInterface dialog, int which) {
117                                makeCurrentEngine(buttonView);
118                            }
119                        },
120                        new DialogInterface.OnClickListener() {
121                            @Override
122                            public void onClick(DialogInterface dialog, int which) {
123                                // Undo the click.
124                                buttonView.setChecked(false);
125                            }
126                        });
127            } else {
128                // Privileged engine, set it current
129                makeCurrentEngine(buttonView);
130            }
131        }
132    }
133
134    private void makeCurrentEngine(Checkable current) {
135        if (mSharedState.getCurrentChecked() != null) {
136            mSharedState.getCurrentChecked().setChecked(false);
137        }
138        mSharedState.setCurrentChecked(current);
139        mSharedState.setCurrentKey(getKey());
140        callChangeListener(mSharedState.getCurrentKey());
141    }
142
143
144    /**
145     * Holds all state that is common to this group of radio buttons, such
146     * as the currently selected key and the currently checked compound button.
147     * (which corresponds to this key).
148     */
149    public interface RadioButtonGroupState {
150        String getCurrentKey();
151        Checkable getCurrentChecked();
152
153        void setCurrentKey(String key);
154        void setCurrentChecked(Checkable current);
155    }
156
157}
158