BarTransitions.java revision ea56251d92050e9a672d1f66d0d4621e4dd4136e 
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    public static final int MODE_TRANSPARENT = 4;
47
48    public static final int LIGHTS_IN_DURATION = 250;
49    public static final int LIGHTS_OUT_DURATION = 750;
50    public static final int BACKGROUND_DURATION = 200;
51
52    private final String mTag;
53    private final View mView;
54    private final BarBackgroundDrawable mBarBackground;
55
56    private int mMode;
57
58    public BarTransitions(View view, int gradientResourceId) {
59        mTag = "BarTransitions." + view.getClass().getSimpleName();
60        mView = view;
61        mBarBackground = new BarBackgroundDrawable(mView.getContext(), gradientResourceId);
62        if (HIGH_END) {
63            mView.setBackground(mBarBackground);
64        }
65    }
66
67    public int getMode() {
68        return mMode;
69    }
70
71    public void transitionTo(int mode, boolean animate) {
72        // low-end devices do not support translucent modes, fallback to opaque
73        if (!HIGH_END && (mode == MODE_SEMI_TRANSPARENT || mode == MODE_TRANSLUCENT
74                || mode == MODE_TRANSPARENT)) {
75            mode = MODE_OPAQUE;
76        }
77        if (mMode == mode) return;
78        int oldMode = mMode;
79        mMode = mode;
80        if (DEBUG) Log.d(mTag, String.format("%s -> %s animate=%s",
81                modeToString(oldMode), modeToString(mode),  animate));
82        onTransition(oldMode, mMode, animate);
83    }
84
85    protected void onTransition(int oldMode, int newMode, boolean animate) {
86        if (HIGH_END) {
87            applyModeBackground(oldMode, newMode, animate);
88        }
89    }
90
91    protected void applyModeBackground(int oldMode, int newMode, boolean animate) {
92        if (DEBUG) Log.d(mTag, String.format("applyModeBackground oldMode=%s newMode=%s animate=%s",
93                modeToString(oldMode), modeToString(newMode), animate));
94        mBarBackground.applyModeBackground(oldMode, newMode, animate);
95    }
96
97    public static String modeToString(int mode) {
98        if (mode == MODE_OPAQUE) return "MODE_OPAQUE";
99        if (mode == MODE_SEMI_TRANSPARENT) return "MODE_SEMI_TRANSPARENT";
100        if (mode == MODE_TRANSLUCENT) return "MODE_TRANSLUCENT";
101        if (mode == MODE_LIGHTS_OUT) return "MODE_LIGHTS_OUT";
102        if (mode == MODE_TRANSPARENT) return "MODE_TRANSPARENT";
103        throw new IllegalArgumentException("Unknown mode " + mode);
104    }
105
106    public void finishAnimations() {
107        mBarBackground.finishAnimation();
108    }
109
110    public void setContentVisible(boolean visible) {
111        // for subclasses
112    }
113
114    private static class BarBackgroundDrawable extends Drawable {
115        private final int mOpaque;
116        private final int mSemiTransparent;
117        private final int mTransparent;
118        private final Drawable mGradient;
119        private final TimeInterpolator mInterpolator;
120
121        private int mMode = -1;
122        private boolean mAnimating;
123        private long mStartTime;
124        private long mEndTime;
125
126        private int mGradientAlpha;
127        private int mColor;
128
129        private int mGradientAlphaStart;
130        private int mColorStart;
131
132        public BarBackgroundDrawable(Context context, int gradientResourceId) {
133            final Resources res = context.getResources();
134            if (DEBUG_COLORS) {
135                mOpaque = 0xff0000ff;
136                mSemiTransparent = 0x7f0000ff;
137                mTransparent = 0x2f0000ff;
138            } else {
139                mOpaque = res.getColor(R.color.system_bar_background_opaque);
140                mSemiTransparent = res.getColor(R.color.system_bar_background_semi_transparent);
141                mTransparent = res.getColor(R.color.system_bar_background_transparent);
142            }
143            mGradient = res.getDrawable(gradientResourceId);
144            mInterpolator = new LinearInterpolator();
145        }
146
147        @Override
148        public void setAlpha(int alpha) {
149            // noop
150        }
151
152        @Override
153        public void setColorFilter(ColorFilter cf) {
154            // noop
155        }
156
157        @Override
158        protected void onBoundsChange(Rect bounds) {
159            super.onBoundsChange(bounds);
160            mGradient.setBounds(bounds);
161        }
162
163        public void applyModeBackground(int oldMode, int newMode, boolean animate) {
164            if (mMode == newMode) return;
165            mMode = newMode;
166            mAnimating = animate;
167            if (animate) {
168                long now = SystemClock.elapsedRealtime();
169                mStartTime = now;
170                mEndTime = now + BACKGROUND_DURATION;
171                mGradientAlphaStart = mGradientAlpha;
172                mColorStart = mColor;
173            }
174            invalidateSelf();
175        }
176
177        @Override
178        public int getOpacity() {
179            return PixelFormat.TRANSLUCENT;
180        }
181
182        public void finishAnimation() {
183            if (mAnimating) {
184                mAnimating = false;
185                invalidateSelf();
186            }
187        }
188
189        @Override
190        public void draw(Canvas canvas) {
191            int targetGradientAlpha = 0, targetColor = 0;
192            if (mMode == MODE_TRANSLUCENT) {
193                targetColor = mSemiTransparent;
194            } else if (mMode == MODE_SEMI_TRANSPARENT) {
195                targetColor = mSemiTransparent;
196            } else if (mMode == MODE_TRANSPARENT) {
197                targetColor = mTransparent;
198            } else {
199                targetColor = mOpaque;
200            }
201            if (!mAnimating) {
202                mColor = targetColor;
203                mGradientAlpha = targetGradientAlpha;
204            } else {
205                final long now = SystemClock.elapsedRealtime();
206                if (now >= mEndTime) {
207                    mAnimating = false;
208                    mColor = targetColor;
209                    mGradientAlpha = targetGradientAlpha;
210                } else {
211                    final float t = (now - mStartTime) / (float)(mEndTime - mStartTime);
212                    final float v = Math.max(0, Math.min(mInterpolator.getInterpolation(t), 1));
213                    mGradientAlpha = (int)(v * targetGradientAlpha + mGradientAlphaStart * (1 - v));
214                    mColor = Color.argb(
215                          (int)(v * Color.alpha(targetColor) + Color.alpha(mColorStart) * (1 - v)),
216                          (int)(v * Color.red(targetColor) + Color.red(mColorStart) * (1 - v)),
217                          (int)(v * Color.green(targetColor) + Color.green(mColorStart) * (1 - v)),
218                          (int)(v * Color.blue(targetColor) + Color.blue(mColorStart) * (1 - v)));
219                }
220            }
221            if (mGradientAlpha > 0) {
222                mGradient.setAlpha(mGradientAlpha);
223                mGradient.draw(canvas);
224            }
225            if (Color.alpha(mColor) > 0) {
226                canvas.drawColor(mColor);
227            }
228            if (mAnimating) {
229                invalidateSelf();  // keep going
230            }
231        }
232    }
233}
234