BarTransitions.java revision 42197263bc08843ad18a8660887ef540c630c232 
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 int MODE_OPAQUE = 0;
41    public static final int MODE_SEMI_TRANSPARENT = 1;
42    public static final int MODE_TRANSLUCENT = 2;
43    public static final int MODE_LIGHTS_OUT = 3;
44
45    public static final int LIGHTS_IN_DURATION = 250;
46    public static final int LIGHTS_OUT_DURATION = 750;
47    public static final int BACKGROUND_DURATION = 200;
48
49    private final String mTag;
50    private final View mView;
51    private final boolean mSupportsTransitions = ActivityManager.isHighEndGfx();
52    private final BarBackgroundDrawable mBarBackground;
53
54    private int mMode;
55
56    public BarTransitions(View view, int gradientResourceId) {
57        mTag = "BarTransitions." + view.getClass().getSimpleName();
58        mView = view;
59        mBarBackground = new BarBackgroundDrawable(mView.getContext(), gradientResourceId);
60        if (mSupportsTransitions) {
61            mView.setBackground(mBarBackground);
62        }
63    }
64
65    public int getMode() {
66        return mMode;
67    }
68
69    public void transitionTo(int mode, boolean animate) {
70        if (mMode == mode) return;
71        int oldMode = mMode;
72        mMode = mode;
73        if (DEBUG) Log.d(mTag, String.format("%s -> %s animate=%s",
74                modeToString(oldMode), modeToString(mode),  animate));
75        if (mSupportsTransitions) {
76            onTransition(oldMode, mMode, animate);
77        }
78    }
79
80    protected void onTransition(int oldMode, int newMode, boolean animate) {
81        applyModeBackground(oldMode, newMode, animate);
82    }
83
84    protected void applyModeBackground(int oldMode, int newMode, boolean animate) {
85        if (DEBUG) Log.d(mTag, String.format("applyModeBackground oldMode=%s newMode=%s animate=%s",
86                modeToString(oldMode), modeToString(newMode), animate));
87        mBarBackground.applyModeBackground(oldMode, newMode, animate);
88    }
89
90    public static String modeToString(int mode) {
91        if (mode == MODE_OPAQUE) return "MODE_OPAQUE";
92        if (mode == MODE_SEMI_TRANSPARENT) return "MODE_SEMI_TRANSPARENT";
93        if (mode == MODE_TRANSLUCENT) return "MODE_TRANSLUCENT";
94        if (mode == MODE_LIGHTS_OUT) return "MODE_LIGHTS_OUT";
95        throw new IllegalArgumentException("Unknown mode " + mode);
96    }
97
98    public void finishAnimations() {
99        mBarBackground.finishAnimation();
100    }
101
102    private static class BarBackgroundDrawable extends Drawable {
103        private final int mOpaque;
104        private final int mSemiTransparent;
105        private final Drawable mGradient;
106        private final TimeInterpolator mInterpolator;
107
108        private int mMode = -1;
109        private boolean mAnimating;
110        private long mStartTime;
111        private long mEndTime;
112
113        private int mGradientAlpha;
114        private int mColor;
115
116        private int mGradientAlphaStart;
117        private int mColorStart;
118
119        public BarBackgroundDrawable(Context context, int gradientResourceId) {
120            final Resources res = context.getResources();
121            if (DEBUG_COLORS) {
122                mOpaque = 0xff0000ff;
123                mSemiTransparent = 0x7f0000ff;
124            } else {
125                mOpaque = res.getColor(R.color.system_bar_background_opaque);
126                mSemiTransparent = res.getColor(R.color.system_bar_background_semi_transparent);
127            }
128            mGradient = res.getDrawable(gradientResourceId);
129            mInterpolator = new LinearInterpolator();
130        }
131
132        @Override
133        public void setAlpha(int alpha) {
134            // noop
135        }
136
137        @Override
138        public void setColorFilter(ColorFilter cf) {
139            // noop
140        }
141
142        @Override
143        protected void onBoundsChange(Rect bounds) {
144            super.onBoundsChange(bounds);
145            mGradient.setBounds(bounds);
146        }
147
148        public void applyModeBackground(int oldMode, int newMode, boolean animate) {
149            if (mMode == newMode) return;
150            mMode = newMode;
151            mAnimating = animate;
152            if (animate) {
153                long now = SystemClock.elapsedRealtime();
154                mStartTime = now;
155                mEndTime = now + BACKGROUND_DURATION;
156                mGradientAlphaStart = mGradientAlpha;
157                mColorStart = mColor;
158            }
159            invalidateSelf();
160        }
161
162        @Override
163        public int getOpacity() {
164            return PixelFormat.TRANSLUCENT;
165        }
166
167        public void finishAnimation() {
168            if (mAnimating) {
169                mAnimating = false;
170                invalidateSelf();
171            }
172        }
173
174        @Override
175        public void draw(Canvas canvas) {
176            int targetGradientAlpha = 0, targetColor = 0;
177            if (mMode == MODE_TRANSLUCENT) {
178                targetGradientAlpha = 0xff;
179            } else if (mMode == MODE_SEMI_TRANSPARENT) {
180                targetColor = mSemiTransparent;
181            } else {
182                targetColor = mOpaque;
183            }
184            if (!mAnimating) {
185                mColor = targetColor;
186                mGradientAlpha = targetGradientAlpha;
187            } else {
188                final long now = SystemClock.elapsedRealtime();
189                if (now >= mEndTime) {
190                    mAnimating = false;
191                    mColor = targetColor;
192                    mGradientAlpha = targetGradientAlpha;
193                } else {
194                    final float t = (now - mStartTime) / (float)(mEndTime - mStartTime);
195                    final float v = Math.max(0, Math.min(mInterpolator.getInterpolation(t), 1));
196                    mGradientAlpha = (int)(v * targetGradientAlpha + mGradientAlphaStart * (1 - v));
197                    mColor = Color.argb(
198                          (int)(v * Color.alpha(targetColor) + Color.alpha(mColorStart) * (1 - v)),
199                          (int)(v * Color.red(targetColor) + Color.red(mColorStart) * (1 - v)),
200                          (int)(v * Color.green(targetColor) + Color.green(mColorStart) * (1 - v)),
201                          (int)(v * Color.blue(targetColor) + Color.blue(mColorStart) * (1 - v)));
202                }
203            }
204            if (mGradientAlpha > 0) {
205                mGradient.setAlpha(mGradientAlpha);
206                mGradient.draw(canvas);
207            }
208            if (Color.alpha(mColor) > 0) {
209                canvas.drawColor(mColor);
210            }
211            if (mAnimating) {
212                invalidateSelf();  // keep going
213            }
214        }
215    }
216}
217