BarTransitions.java revision 56d007b99841f7f603e5d5bc5c23b94c010f1945 
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    public void setContentVisible(boolean visible) {
103        // for subclasses
104    }
105
106    private static class BarBackgroundDrawable extends Drawable {
107        private final int mOpaque;
108        private final int mSemiTransparent;
109        private final Drawable mGradient;
110        private final TimeInterpolator mInterpolator;
111
112        private int mMode = -1;
113        private boolean mAnimating;
114        private long mStartTime;
115        private long mEndTime;
116
117        private int mGradientAlpha;
118        private int mColor;
119
120        private int mGradientAlphaStart;
121        private int mColorStart;
122
123        public BarBackgroundDrawable(Context context, int gradientResourceId) {
124            final Resources res = context.getResources();
125            if (DEBUG_COLORS) {
126                mOpaque = 0xff0000ff;
127                mSemiTransparent = 0x7f0000ff;
128            } else {
129                mOpaque = res.getColor(R.color.system_bar_background_opaque);
130                mSemiTransparent = res.getColor(R.color.system_bar_background_semi_transparent);
131            }
132            mGradient = res.getDrawable(gradientResourceId);
133            mInterpolator = new LinearInterpolator();
134        }
135
136        @Override
137        public void setAlpha(int alpha) {
138            // noop
139        }
140
141        @Override
142        public void setColorFilter(ColorFilter cf) {
143            // noop
144        }
145
146        @Override
147        protected void onBoundsChange(Rect bounds) {
148            super.onBoundsChange(bounds);
149            mGradient.setBounds(bounds);
150        }
151
152        public void applyModeBackground(int oldMode, int newMode, boolean animate) {
153            if (mMode == newMode) return;
154            mMode = newMode;
155            mAnimating = animate;
156            if (animate) {
157                long now = SystemClock.elapsedRealtime();
158                mStartTime = now;
159                mEndTime = now + BACKGROUND_DURATION;
160                mGradientAlphaStart = mGradientAlpha;
161                mColorStart = mColor;
162            }
163            invalidateSelf();
164        }
165
166        @Override
167        public int getOpacity() {
168            return PixelFormat.TRANSLUCENT;
169        }
170
171        public void finishAnimation() {
172            if (mAnimating) {
173                mAnimating = false;
174                invalidateSelf();
175            }
176        }
177
178        @Override
179        public void draw(Canvas canvas) {
180            int targetGradientAlpha = 0, targetColor = 0;
181            if (mMode == MODE_TRANSLUCENT) {
182                targetGradientAlpha = 0xff;
183            } else if (mMode == MODE_SEMI_TRANSPARENT) {
184                targetColor = mSemiTransparent;
185            } else {
186                targetColor = mOpaque;
187            }
188            if (!mAnimating) {
189                mColor = targetColor;
190                mGradientAlpha = targetGradientAlpha;
191            } else {
192                final long now = SystemClock.elapsedRealtime();
193                if (now >= mEndTime) {
194                    mAnimating = false;
195                    mColor = targetColor;
196                    mGradientAlpha = targetGradientAlpha;
197                } else {
198                    final float t = (now - mStartTime) / (float)(mEndTime - mStartTime);
199                    final float v = Math.max(0, Math.min(mInterpolator.getInterpolation(t), 1));
200                    mGradientAlpha = (int)(v * targetGradientAlpha + mGradientAlphaStart * (1 - v));
201                    mColor = Color.argb(
202                          (int)(v * Color.alpha(targetColor) + Color.alpha(mColorStart) * (1 - v)),
203                          (int)(v * Color.red(targetColor) + Color.red(mColorStart) * (1 - v)),
204                          (int)(v * Color.green(targetColor) + Color.green(mColorStart) * (1 - v)),
205                          (int)(v * Color.blue(targetColor) + Color.blue(mColorStart) * (1 - v)));
206                }
207            }
208            if (mGradientAlpha > 0) {
209                mGradient.setAlpha(mGradientAlpha);
210                mGradient.draw(canvas);
211            }
212            if (Color.alpha(mColor) > 0) {
213                canvas.drawColor(mColor);
214            }
215            if (mAnimating) {
216                invalidateSelf();  // keep going
217            }
218        }
219    }
220}
221