BarTransitions.java revision fd0e6c0d6fd17c7a5949ae581bf2355268545fd4 
1/*
2 * Copyright (C) 2013 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.systemui.statusbar.phone;
18
19import android.animation.TimeInterpolator;
20import android.app.ActivityManager;
21import android.content.Context;
22import android.content.res.Resources;
23import android.graphics.Canvas;
24import android.graphics.Color;
25import android.graphics.ColorFilter;
26import android.graphics.PixelFormat;
27import android.graphics.Rect;
28import android.graphics.drawable.Drawable;
29import android.os.SystemClock;
30import android.util.Log;
31import android.view.View;
32import android.view.animation.LinearInterpolator;
33
34import com.android.systemui.R;
35
36public class BarTransitions {
37    private static final boolean DEBUG = false;
38    private static final boolean DEBUG_COLORS = false;
39
40    public static final boolean HIGH_END = ActivityManager.isHighEndGfx();
41
42    public static final int MODE_OPAQUE = 0;
43    public static final int MODE_SEMI_TRANSPARENT = 1;
44    public static final int MODE_TRANSLUCENT = 2;
45    public static final int MODE_LIGHTS_OUT = 3;
46
47    public static final int LIGHTS_IN_DURATION = 250;
48    public static final int LIGHTS_OUT_DURATION = 750;
49    public static final int BACKGROUND_DURATION = 200;
50
51    private final String mTag;
52    private final View mView;
53    private final BarBackgroundDrawable mBarBackground;
54
55    private int mMode;
56
57    public BarTransitions(View view, int gradientResourceId) {
58        mTag = "BarTransitions." + view.getClass().getSimpleName();
59        mView = view;
60        mBarBackground = new BarBackgroundDrawable(mView.getContext(), gradientResourceId);
61        if (HIGH_END) {
62            mView.setBackground(mBarBackground);
63        }
64    }
65
66    public int getMode() {
67        return mMode;
68    }
69
70    public void transitionTo(int mode, boolean animate) {
71        // low-end devices do not support translucent modes, fallback to opaque
72        if (!HIGH_END && (mode == MODE_SEMI_TRANSPARENT || mode == MODE_TRANSLUCENT)) {
73            mode = MODE_OPAQUE;
74        }
75        if (mMode == mode) return;
76        int oldMode = mMode;
77        mMode = mode;
78        if (DEBUG) Log.d(mTag, String.format("%s -> %s animate=%s",
79                modeToString(oldMode), modeToString(mode),  animate));
80        onTransition(oldMode, mMode, animate);
81    }
82
83    protected void onTransition(int oldMode, int newMode, boolean animate) {
84        if (HIGH_END) {
85            applyModeBackground(oldMode, newMode, animate);
86        }
87    }
88
89    protected void applyModeBackground(int oldMode, int newMode, boolean animate) {
90        if (DEBUG) Log.d(mTag, String.format("applyModeBackground oldMode=%s newMode=%s animate=%s",
91                modeToString(oldMode), modeToString(newMode), animate));
92        mBarBackground.applyModeBackground(oldMode, newMode, animate);
93    }
94
95    public static String modeToString(int mode) {
96        if (mode == MODE_OPAQUE) return "MODE_OPAQUE";
97        if (mode == MODE_SEMI_TRANSPARENT) return "MODE_SEMI_TRANSPARENT";
98        if (mode == MODE_TRANSLUCENT) return "MODE_TRANSLUCENT";
99        if (mode == MODE_LIGHTS_OUT) return "MODE_LIGHTS_OUT";
100        throw new IllegalArgumentException("Unknown mode " + mode);
101    }
102
103    public void finishAnimations() {
104        mBarBackground.finishAnimation();
105    }
106
107    public void setContentVisible(boolean visible) {
108        // for subclasses
109    }
110
111    private static class BarBackgroundDrawable extends Drawable {
112        private final int mOpaque;
113        private final int mSemiTransparent;
114        private final Drawable mGradient;
115        private final TimeInterpolator mInterpolator;
116
117        private int mMode = -1;
118        private boolean mAnimating;
119        private long mStartTime;
120        private long mEndTime;
121
122        private int mGradientAlpha;
123        private int mColor;
124
125        private int mGradientAlphaStart;
126        private int mColorStart;
127
128        public BarBackgroundDrawable(Context context, int gradientResourceId) {
129            final Resources res = context.getResources();
130            if (DEBUG_COLORS) {
131                mOpaque = 0xff0000ff;
132                mSemiTransparent = 0x7f0000ff;
133            } else {
134                mOpaque = res.getColor(R.color.system_bar_background_opaque);
135                mSemiTransparent = res.getColor(R.color.system_bar_background_semi_transparent);
136            }
137            mGradient = res.getDrawable(gradientResourceId);
138            mInterpolator = new LinearInterpolator();
139        }
140
141        @Override
142        public void setAlpha(int alpha) {
143            // noop
144        }
145
146        @Override
147        public void setColorFilter(ColorFilter cf) {
148            // noop
149        }
150
151        @Override
152        protected void onBoundsChange(Rect bounds) {
153            super.onBoundsChange(bounds);
154            mGradient.setBounds(bounds);
155        }
156
157        public void applyModeBackground(int oldMode, int newMode, boolean animate) {
158            if (mMode == newMode) return;
159            mMode = newMode;
160            mAnimating = animate;
161            if (animate) {
162                long now = SystemClock.elapsedRealtime();
163                mStartTime = now;
164                mEndTime = now + BACKGROUND_DURATION;
165                mGradientAlphaStart = mGradientAlpha;
166                mColorStart = mColor;
167            }
168            invalidateSelf();
169        }
170
171        @Override
172        public int getOpacity() {
173            return PixelFormat.TRANSLUCENT;
174        }
175
176        public void finishAnimation() {
177            if (mAnimating) {
178                mAnimating = false;
179                invalidateSelf();
180            }
181        }
182
183        @Override
184        public void draw(Canvas canvas) {
185            int targetGradientAlpha = 0, targetColor = 0;
186            if (mMode == MODE_TRANSLUCENT) {
187                targetGradientAlpha = 0xff;
188            } else if (mMode == MODE_SEMI_TRANSPARENT) {
189                targetColor = mSemiTransparent;
190            } else {
191                targetColor = mOpaque;
192            }
193            if (!mAnimating) {
194                mColor = targetColor;
195                mGradientAlpha = targetGradientAlpha;
196            } else {
197                final long now = SystemClock.elapsedRealtime();
198                if (now >= mEndTime) {
199                    mAnimating = false;
200                    mColor = targetColor;
201                    mGradientAlpha = targetGradientAlpha;
202                } else {
203                    final float t = (now - mStartTime) / (float)(mEndTime - mStartTime);
204                    final float v = Math.max(0, Math.min(mInterpolator.getInterpolation(t), 1));
205                    mGradientAlpha = (int)(v * targetGradientAlpha + mGradientAlphaStart * (1 - v));
206                    mColor = Color.argb(
207                          (int)(v * Color.alpha(targetColor) + Color.alpha(mColorStart) * (1 - v)),
208                          (int)(v * Color.red(targetColor) + Color.red(mColorStart) * (1 - v)),
209                          (int)(v * Color.green(targetColor) + Color.green(mColorStart) * (1 - v)),
210                          (int)(v * Color.blue(targetColor) + Color.blue(mColorStart) * (1 - v)));
211                }
212            }
213            if (mGradientAlpha > 0) {
214                mGradient.setAlpha(mGradientAlpha);
215                mGradient.draw(canvas);
216            }
217            if (Color.alpha(mColor) > 0) {
218                canvas.drawColor(mColor);
219            }
220            if (mAnimating) {
221                invalidateSelf();  // keep going
222            }
223        }
224    }
225}
226