1/*
2 * Copyright (C) 2007 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 android.preference;
18
19import android.app.Dialog;
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.os.Parcel;
23import android.os.Parcelable;
24import android.util.AttributeSet;
25import android.view.KeyEvent;
26import android.view.View;
27import android.widget.SeekBar;
28
29import com.android.internal.R;
30
31/**
32 * @hide
33 */
34public class VolumePreference extends SeekBarDialogPreference implements
35        PreferenceManager.OnActivityStopListener, View.OnKeyListener, SeekBarVolumizer.Callback {
36    private int mStreamType;
37
38    /** May be null if the dialog isn't visible. */
39    private SeekBarVolumizer mSeekBarVolumizer;
40
41    public VolumePreference(
42            Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
43        super(context, attrs, defStyleAttr, defStyleRes);
44
45        final TypedArray a = context.obtainStyledAttributes(attrs,
46                R.styleable.VolumePreference, defStyleAttr, defStyleRes);
47        mStreamType = a.getInt(android.R.styleable.VolumePreference_streamType, 0);
48        a.recycle();
49    }
50
51    public VolumePreference(Context context, AttributeSet attrs, int defStyleAttr) {
52        this(context, attrs, defStyleAttr, 0);
53    }
54
55    public VolumePreference(Context context, AttributeSet attrs) {
56        this(context, attrs, R.attr.seekBarDialogPreferenceStyle);
57    }
58
59    public VolumePreference(Context context) {
60        this(context, null);
61    }
62
63    public void setStreamType(int streamType) {
64        mStreamType = streamType;
65    }
66
67    @Override
68    protected void onBindDialogView(View view) {
69        super.onBindDialogView(view);
70
71        final SeekBar seekBar = (SeekBar) view.findViewById(R.id.seekbar);
72        mSeekBarVolumizer = new SeekBarVolumizer(getContext(), mStreamType, null, this);
73        mSeekBarVolumizer.start();
74        mSeekBarVolumizer.setSeekBar(seekBar);
75
76        getPreferenceManager().registerOnActivityStopListener(this);
77
78        // grab focus and key events so that pressing the volume buttons in the
79        // dialog doesn't also show the normal volume adjust toast.
80        view.setOnKeyListener(this);
81        view.setFocusableInTouchMode(true);
82        view.requestFocus();
83    }
84
85    public boolean onKey(View v, int keyCode, KeyEvent event) {
86        // If key arrives immediately after the activity has been cleaned up.
87        if (mSeekBarVolumizer == null) return true;
88        boolean isdown = (event.getAction() == KeyEvent.ACTION_DOWN);
89        switch (keyCode) {
90            case KeyEvent.KEYCODE_VOLUME_DOWN:
91                if (isdown) {
92                    mSeekBarVolumizer.changeVolumeBy(-1);
93                }
94                return true;
95            case KeyEvent.KEYCODE_VOLUME_UP:
96                if (isdown) {
97                    mSeekBarVolumizer.changeVolumeBy(1);
98                }
99                return true;
100            case KeyEvent.KEYCODE_VOLUME_MUTE:
101                if (isdown) {
102                    mSeekBarVolumizer.muteVolume();
103                }
104                return true;
105            default:
106                return false;
107        }
108    }
109
110    @Override
111    protected void onDialogClosed(boolean positiveResult) {
112        super.onDialogClosed(positiveResult);
113
114        if (!positiveResult && mSeekBarVolumizer != null) {
115            mSeekBarVolumizer.revertVolume();
116        }
117
118        cleanup();
119    }
120
121    public void onActivityStop() {
122        if (mSeekBarVolumizer != null) {
123            mSeekBarVolumizer.stopSample();
124        }
125    }
126
127    /**
128     * Do clean up.  This can be called multiple times!
129     */
130    private void cleanup() {
131       getPreferenceManager().unregisterOnActivityStopListener(this);
132
133       if (mSeekBarVolumizer != null) {
134           final Dialog dialog = getDialog();
135           if (dialog != null && dialog.isShowing()) {
136               final View view = dialog.getWindow().getDecorView().findViewById(R.id.seekbar);
137               if (view != null) {
138                   view.setOnKeyListener(null);
139               }
140
141               // Stopped while dialog was showing, revert changes
142               mSeekBarVolumizer.revertVolume();
143           }
144
145           mSeekBarVolumizer.stop();
146           mSeekBarVolumizer = null;
147       }
148
149    }
150
151    @Override
152    public void onSampleStarting(SeekBarVolumizer volumizer) {
153        if (mSeekBarVolumizer != null && volumizer != mSeekBarVolumizer) {
154            mSeekBarVolumizer.stopSample();
155        }
156    }
157
158    @Override
159    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
160        // noop
161    }
162
163    @Override
164    public void onMuted(boolean muted, boolean zenMuted) {
165        // noop
166    }
167
168    @Override
169    protected Parcelable onSaveInstanceState() {
170        final Parcelable superState = super.onSaveInstanceState();
171        if (isPersistent()) {
172            // No need to save instance state since it's persistent
173            return superState;
174        }
175
176        final SavedState myState = new SavedState(superState);
177        if (mSeekBarVolumizer != null) {
178            mSeekBarVolumizer.onSaveInstanceState(myState.getVolumeStore());
179        }
180        return myState;
181    }
182
183    @Override
184    protected void onRestoreInstanceState(Parcelable state) {
185        if (state == null || !state.getClass().equals(SavedState.class)) {
186            // Didn't save state for us in onSaveInstanceState
187            super.onRestoreInstanceState(state);
188            return;
189        }
190
191        SavedState myState = (SavedState) state;
192        super.onRestoreInstanceState(myState.getSuperState());
193        if (mSeekBarVolumizer != null) {
194            mSeekBarVolumizer.onRestoreInstanceState(myState.getVolumeStore());
195        }
196    }
197
198    public static class VolumeStore {
199        public int volume = -1;
200        public int originalVolume = -1;
201    }
202
203    private static class SavedState extends BaseSavedState {
204        VolumeStore mVolumeStore = new VolumeStore();
205
206        public SavedState(Parcel source) {
207            super(source);
208            mVolumeStore.volume = source.readInt();
209            mVolumeStore.originalVolume = source.readInt();
210        }
211
212        @Override
213        public void writeToParcel(Parcel dest, int flags) {
214            super.writeToParcel(dest, flags);
215            dest.writeInt(mVolumeStore.volume);
216            dest.writeInt(mVolumeStore.originalVolume);
217        }
218
219        VolumeStore getVolumeStore() {
220            return mVolumeStore;
221        }
222
223        public SavedState(Parcelable superState) {
224            super(superState);
225        }
226
227        public static final Parcelable.Creator<SavedState> CREATOR =
228                new Parcelable.Creator<SavedState>() {
229            public SavedState createFromParcel(Parcel in) {
230                return new SavedState(in);
231            }
232
233            public SavedState[] newArray(int size) {
234                return new SavedState[size];
235            }
236        };
237    }
238}
239