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 */
16package com.android.messaging.ui.mediapicker;
17
18import android.animation.ObjectAnimator;
19import android.animation.TimeAnimator;
20import android.animation.TimeAnimator.TimeListener;
21import android.content.Context;
22import android.content.res.TypedArray;
23import android.graphics.Canvas;
24import android.graphics.Color;
25import android.graphics.Paint;
26import android.graphics.Paint.Style;
27import android.util.AttributeSet;
28import android.util.Log;
29import android.view.View;
30import android.view.accessibility.AccessibilityNodeInfo;
31
32import com.android.messaging.R;
33import com.android.messaging.util.LogUtil;
34
35/**
36 * This view draws circular sound levels. By default the sound levels are black, unless
37 * otherwise defined via {@link #mPrimaryLevelPaint}.
38 */
39public class SoundLevels extends View {
40    private static final String TAG = LogUtil.BUGLE_TAG;
41    private static final boolean DEBUG = false;
42
43    private boolean mCenterDefined;
44    private int mCenterX;
45    private int mCenterY;
46
47    // Paint for the main level meter, most closely follows the mic.
48    private final Paint mPrimaryLevelPaint;
49
50    // The minimum size of the levels as a percentage of the max, that is the size when volume is 0.
51    private final float mMinimumLevel;
52
53    // The minimum size of the levels, that is the size when volume is 0.
54    private final float mMinimumLevelSize;
55
56    // The maximum size of the levels, that is the size when volume is 100.
57    private final float mMaximumLevelSize;
58
59    // Generates clock ticks for the animation using the global animation loop.
60    private final TimeAnimator mSpeechLevelsAnimator;
61
62    private float mCurrentVolume;
63
64    // Indicates whether we should be animating the sound level.
65    private boolean mIsEnabled;
66
67    // Input level is pulled from here.
68    private AudioLevelSource mLevelSource;
69
70    public SoundLevels(final Context context) {
71        this(context, null);
72    }
73
74    public SoundLevels(final Context context, final AttributeSet attrs) {
75        this(context, attrs, 0);
76    }
77
78    public SoundLevels(final Context context, final AttributeSet attrs, final int defStyle) {
79        super(context, attrs, defStyle);
80
81        // Safe source, replaced with system one when attached.
82        mLevelSource = new AudioLevelSource();
83        mLevelSource.setSpeechLevel(0);
84
85        final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SoundLevels,
86                defStyle, 0);
87
88        mMaximumLevelSize = a.getDimensionPixelOffset(
89                R.styleable.SoundLevels_maxLevelRadius, 0);
90        mMinimumLevelSize = a.getDimensionPixelOffset(
91                R.styleable.SoundLevels_minLevelRadius, 0);
92        mMinimumLevel = mMinimumLevelSize / mMaximumLevelSize;
93
94        mPrimaryLevelPaint = new Paint();
95        mPrimaryLevelPaint.setColor(
96                a.getColor(R.styleable.SoundLevels_primaryColor, Color.BLACK));
97        mPrimaryLevelPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
98
99        a.recycle();
100
101        // This animator generates ticks that invalidate the
102        // view so that the animation is synced with the global animation loop.
103        // TODO: We could probably remove this in favor of using postInvalidateOnAnimation
104        // which might improve things further.
105        mSpeechLevelsAnimator = new TimeAnimator();
106        mSpeechLevelsAnimator.setRepeatCount(ObjectAnimator.INFINITE);
107        mSpeechLevelsAnimator.setTimeListener(new TimeListener() {
108            @Override
109            public void onTimeUpdate(final TimeAnimator animation, final long totalTime,
110                    final long deltaTime) {
111                invalidate();
112            }
113        });
114    }
115
116    @Override
117    protected void onDraw(final Canvas canvas) {
118        if (!mIsEnabled) {
119            return;
120        }
121
122        if (!mCenterDefined) {
123            // One time computation here, because we can't rely on getWidth() to be computed at
124            // constructor time or in onFinishInflate :(.
125            mCenterX = getWidth() / 2;
126            mCenterY = getWidth() / 2;
127            mCenterDefined = true;
128        }
129
130        final int level = mLevelSource.getSpeechLevel();
131        // Either ease towards the target level, or decay away from it depending on whether
132        // its higher or lower than the current.
133        if (level > mCurrentVolume) {
134            mCurrentVolume = mCurrentVolume + ((level - mCurrentVolume) / 4);
135        } else {
136            mCurrentVolume = mCurrentVolume * 0.95f;
137        }
138
139        final float radius = mMinimumLevel + (1f - mMinimumLevel) * mCurrentVolume / 100;
140        mPrimaryLevelPaint.setStyle(Style.FILL);
141        canvas.drawCircle(mCenterX, mCenterY, radius * mMaximumLevelSize, mPrimaryLevelPaint);
142    }
143
144    public void setLevelSource(final AudioLevelSource source) {
145        if (DEBUG) {
146            Log.d(TAG, "Speech source set.");
147        }
148        mLevelSource = source;
149    }
150
151    private void startSpeechLevelsAnimator() {
152        if (DEBUG) {
153            Log.d(TAG, "startAnimator()");
154        }
155        if (!mSpeechLevelsAnimator.isStarted()) {
156            mSpeechLevelsAnimator.start();
157        }
158    }
159
160    private void stopSpeechLevelsAnimator() {
161        if (DEBUG) {
162            Log.d(TAG, "stopAnimator()");
163        }
164        if (mSpeechLevelsAnimator.isStarted()) {
165            mSpeechLevelsAnimator.end();
166        }
167    }
168
169    @Override
170    protected void onDetachedFromWindow() {
171        super.onDetachedFromWindow();
172        stopSpeechLevelsAnimator();
173    }
174
175    @Override
176    public void setEnabled(final boolean enabled) {
177        if (enabled == mIsEnabled) {
178            return;
179        }
180        if (DEBUG) {
181            Log.d("TAG", "setEnabled: " + enabled);
182        }
183        super.setEnabled(enabled);
184        mIsEnabled = enabled;
185        setKeepScreenOn(enabled);
186        updateSpeechLevelsAnimatorState();
187    }
188
189    private void updateSpeechLevelsAnimatorState() {
190        if (mIsEnabled) {
191            startSpeechLevelsAnimator();
192        } else {
193            stopSpeechLevelsAnimator();
194        }
195    }
196
197    /**
198     * This is required to make the View findable by uiautomator
199     */
200    @Override
201    public void onInitializeAccessibilityNodeInfo(final AccessibilityNodeInfo info) {
202        super.onInitializeAccessibilityNodeInfo(info);
203        info.setClassName(SoundLevels.class.getCanonicalName());
204    }
205
206    /**
207     * Set the alpha level of the sound circles.
208     */
209    public void setPrimaryColorAlpha(final int alpha) {
210        mPrimaryLevelPaint.setAlpha(alpha);
211    }
212}
213