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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.app.ActivityManager;
20import android.content.Context;
21import android.content.res.Resources;
22import android.graphics.Canvas;
23import android.graphics.Color;
24import android.graphics.ColorFilter;
25import android.graphics.Paint;
26import android.graphics.PixelFormat;
27import android.graphics.PorterDuff;
28import android.graphics.PorterDuffColorFilter;
29import android.graphics.Rect;
30import android.graphics.PorterDuff.Mode;
31import android.graphics.drawable.Drawable;
32import android.os.SystemClock;
33import android.util.Log;
34import android.view.View;
35
36import com.android.systemui.Interpolators;
37import com.android.systemui.R;
38
39public class BarTransitions {
40    private static final boolean DEBUG = false;
41    private static final boolean DEBUG_COLORS = false;
42
43    public static final boolean HIGH_END = ActivityManager.isHighEndGfx();
44
45    public static final int MODE_OPAQUE = 0;
46    public static final int MODE_SEMI_TRANSPARENT = 1;
47    public static final int MODE_TRANSLUCENT = 2;
48    public static final int MODE_LIGHTS_OUT = 3;
49    public static final int MODE_TRANSPARENT = 4;
50    public static final int MODE_WARNING = 5;
51    public static final int MODE_LIGHTS_OUT_TRANSPARENT = 6;
52
53    public static final int LIGHTS_IN_DURATION = 250;
54    public static final int LIGHTS_OUT_DURATION = 750;
55    public static final int BACKGROUND_DURATION = 200;
56
57    private final String mTag;
58    private final View mView;
59    private final BarBackgroundDrawable mBarBackground;
60
61    private int mMode;
62    private boolean mAlwaysOpaque = false;
63
64    public BarTransitions(View view, int gradientResourceId) {
65        mTag = "BarTransitions." + view.getClass().getSimpleName();
66        mView = view;
67        mBarBackground = new BarBackgroundDrawable(mView.getContext(), gradientResourceId);
68        if (HIGH_END) {
69            mView.setBackground(mBarBackground);
70        }
71    }
72
73    public int getMode() {
74        return mMode;
75    }
76
77    /**
78     * @param alwaysOpaque if {@code true}, the bar's background will always be opaque, regardless
79     *         of what mode it is currently set to.
80     */
81    public void setAlwaysOpaque(boolean alwaysOpaque) {
82        mAlwaysOpaque = alwaysOpaque;
83    }
84
85    public boolean isAlwaysOpaque() {
86        // Low-end devices do not support translucent modes, fallback to opaque
87        return !HIGH_END || mAlwaysOpaque;
88    }
89
90    public void transitionTo(int mode, boolean animate) {
91        if (isAlwaysOpaque() && (mode == MODE_SEMI_TRANSPARENT || mode == MODE_TRANSLUCENT
92                || mode == MODE_TRANSPARENT)) {
93            mode = MODE_OPAQUE;
94        }
95        if (isAlwaysOpaque() && (mode == MODE_LIGHTS_OUT_TRANSPARENT)) {
96            mode = MODE_LIGHTS_OUT;
97        }
98        if (mMode == mode) return;
99        int oldMode = mMode;
100        mMode = mode;
101        if (DEBUG) Log.d(mTag, String.format("%s -> %s animate=%s",
102                modeToString(oldMode), modeToString(mode),  animate));
103        onTransition(oldMode, mMode, animate);
104    }
105
106    protected void onTransition(int oldMode, int newMode, boolean animate) {
107        if (HIGH_END) {
108            applyModeBackground(oldMode, newMode, animate);
109        }
110    }
111
112    protected void applyModeBackground(int oldMode, int newMode, boolean animate) {
113        if (DEBUG) Log.d(mTag, String.format("applyModeBackground oldMode=%s newMode=%s animate=%s",
114                modeToString(oldMode), modeToString(newMode), animate));
115        mBarBackground.applyModeBackground(oldMode, newMode, animate);
116    }
117
118    public static String modeToString(int mode) {
119        if (mode == MODE_OPAQUE) return "MODE_OPAQUE";
120        if (mode == MODE_SEMI_TRANSPARENT) return "MODE_SEMI_TRANSPARENT";
121        if (mode == MODE_TRANSLUCENT) return "MODE_TRANSLUCENT";
122        if (mode == MODE_LIGHTS_OUT) return "MODE_LIGHTS_OUT";
123        if (mode == MODE_TRANSPARENT) return "MODE_TRANSPARENT";
124        if (mode == MODE_WARNING) return "MODE_WARNING";
125        if (mode == MODE_LIGHTS_OUT_TRANSPARENT) return "MODE_LIGHTS_OUT_TRANSPARENT";
126        throw new IllegalArgumentException("Unknown mode " + mode);
127    }
128
129    public void finishAnimations() {
130        mBarBackground.finishAnimation();
131    }
132
133    protected boolean isLightsOut(int mode) {
134        return mode == MODE_LIGHTS_OUT || mode == MODE_LIGHTS_OUT_TRANSPARENT;
135    }
136
137    private static class BarBackgroundDrawable extends Drawable {
138        private final int mOpaque;
139        private final int mSemiTransparent;
140        private final int mTransparent;
141        private final int mWarning;
142        private final Drawable mGradient;
143
144        private int mMode = -1;
145        private boolean mAnimating;
146        private long mStartTime;
147        private long mEndTime;
148
149        private int mGradientAlpha;
150        private int mColor;
151        private PorterDuffColorFilter mTintFilter;
152        private Paint mPaint = new Paint();
153
154        private int mGradientAlphaStart;
155        private int mColorStart;
156
157
158        public BarBackgroundDrawable(Context context, int gradientResourceId) {
159            final Resources res = context.getResources();
160            if (DEBUG_COLORS) {
161                mOpaque = 0xff0000ff;
162                mSemiTransparent = 0x7f0000ff;
163                mTransparent = 0x2f0000ff;
164                mWarning = 0xffff0000;
165            } else {
166                mOpaque = context.getColor(R.color.system_bar_background_opaque);
167                mSemiTransparent = context.getColor(
168                        com.android.internal.R.color.system_bar_background_semi_transparent);
169                mTransparent = context.getColor(R.color.system_bar_background_transparent);
170                mWarning = context.getColor(com.android.internal.R.color.battery_saver_mode_color);
171            }
172            mGradient = context.getDrawable(gradientResourceId);
173        }
174
175        @Override
176        public void setAlpha(int alpha) {
177            // noop
178        }
179
180        @Override
181        public void setColorFilter(ColorFilter colorFilter) {
182            // noop
183        }
184
185        @Override
186        public void setTint(int color) {
187            if (mTintFilter == null) {
188                mTintFilter = new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_IN);
189            } else {
190                mTintFilter.setColor(color);
191            }
192            invalidateSelf();
193        }
194
195        @Override
196        public void setTintMode(Mode tintMode) {
197            if (mTintFilter == null) {
198                mTintFilter = new PorterDuffColorFilter(0, tintMode);
199            } else {
200                mTintFilter.setMode(tintMode);
201            }
202            invalidateSelf();
203        }
204
205        @Override
206        protected void onBoundsChange(Rect bounds) {
207            super.onBoundsChange(bounds);
208            mGradient.setBounds(bounds);
209        }
210
211        public void applyModeBackground(int oldMode, int newMode, boolean animate) {
212            if (mMode == newMode) return;
213            mMode = newMode;
214            mAnimating = animate;
215            if (animate) {
216                long now = SystemClock.elapsedRealtime();
217                mStartTime = now;
218                mEndTime = now + BACKGROUND_DURATION;
219                mGradientAlphaStart = mGradientAlpha;
220                mColorStart = mColor;
221            }
222            invalidateSelf();
223        }
224
225        @Override
226        public int getOpacity() {
227            return PixelFormat.TRANSLUCENT;
228        }
229
230        public void finishAnimation() {
231            if (mAnimating) {
232                mAnimating = false;
233                invalidateSelf();
234            }
235        }
236
237        @Override
238        public void draw(Canvas canvas) {
239            int targetGradientAlpha = 0, targetColor = 0;
240            if (mMode == MODE_WARNING) {
241                targetColor = mWarning;
242            } else if (mMode == MODE_TRANSLUCENT) {
243                targetColor = mSemiTransparent;
244            } else if (mMode == MODE_SEMI_TRANSPARENT) {
245                targetColor = mSemiTransparent;
246            } else if (mMode == MODE_TRANSPARENT || mMode == MODE_LIGHTS_OUT_TRANSPARENT) {
247                targetColor = mTransparent;
248            } else {
249                targetColor = mOpaque;
250            }
251
252            if (!mAnimating) {
253                mColor = targetColor;
254                mGradientAlpha = targetGradientAlpha;
255            } else {
256                final long now = SystemClock.elapsedRealtime();
257                if (now >= mEndTime) {
258                    mAnimating = false;
259                    mColor = targetColor;
260                    mGradientAlpha = targetGradientAlpha;
261                } else {
262                    final float t = (now - mStartTime) / (float)(mEndTime - mStartTime);
263                    final float v = Math.max(0, Math.min(
264                            Interpolators.LINEAR.getInterpolation(t), 1));
265                    mGradientAlpha = (int)(v * targetGradientAlpha + mGradientAlphaStart * (1 - v));
266                    mColor = Color.argb(
267                          (int)(v * Color.alpha(targetColor) + Color.alpha(mColorStart) * (1 - v)),
268                          (int)(v * Color.red(targetColor) + Color.red(mColorStart) * (1 - v)),
269                          (int)(v * Color.green(targetColor) + Color.green(mColorStart) * (1 - v)),
270                          (int)(v * Color.blue(targetColor) + Color.blue(mColorStart) * (1 - v)));
271                }
272            }
273            if (mGradientAlpha > 0) {
274                mGradient.setAlpha(mGradientAlpha);
275                mGradient.draw(canvas);
276            }
277            if (Color.alpha(mColor) > 0) {
278                mPaint.setColor(mColor);
279                if (mTintFilter != null) {
280                    mPaint.setColorFilter(mTintFilter);
281                }
282                canvas.drawPaint(mPaint);
283            }
284            if (mAnimating) {
285                invalidateSelf();  // keep going
286            }
287        }
288    }
289}
290