1/*
2 * Copyright (C) 2014 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.policy;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.ObjectAnimator;
22import android.content.Context;
23import android.graphics.Canvas;
24import android.graphics.CanvasProperty;
25import android.graphics.ColorFilter;
26import android.graphics.Paint;
27import android.graphics.PixelFormat;
28import android.graphics.drawable.Drawable;
29import android.view.DisplayListCanvas;
30import android.view.RenderNodeAnimator;
31import android.view.View;
32import android.view.animation.Interpolator;
33
34import com.android.systemui.Interpolators;
35import com.android.systemui.R;
36
37import java.util.ArrayList;
38import java.util.HashSet;
39
40public class KeyButtonRipple extends Drawable {
41
42    private static final float GLOW_MAX_SCALE_FACTOR = 1.35f;
43    private static final float GLOW_MAX_ALPHA = 0.2f;
44    private static final int ANIMATION_DURATION_SCALE = 350;
45    private static final int ANIMATION_DURATION_FADE = 450;
46
47    private Paint mRipplePaint;
48    private CanvasProperty<Float> mLeftProp;
49    private CanvasProperty<Float> mTopProp;
50    private CanvasProperty<Float> mRightProp;
51    private CanvasProperty<Float> mBottomProp;
52    private CanvasProperty<Float> mRxProp;
53    private CanvasProperty<Float> mRyProp;
54    private CanvasProperty<Paint> mPaintProp;
55    private float mGlowAlpha = 0f;
56    private float mGlowScale = 1f;
57    private boolean mPressed;
58    private boolean mDrawingHardwareGlow;
59    private int mMaxWidth;
60
61    private final Interpolator mInterpolator = new LogInterpolator();
62    private boolean mSupportHardware;
63    private final View mTargetView;
64
65    private final HashSet<Animator> mRunningAnimations = new HashSet<>();
66    private final ArrayList<Animator> mTmpArray = new ArrayList<>();
67
68    public KeyButtonRipple(Context ctx, View targetView) {
69        mMaxWidth =  ctx.getResources().getDimensionPixelSize(R.dimen.key_button_ripple_max_width);
70        mTargetView = targetView;
71    }
72
73    private Paint getRipplePaint() {
74        if (mRipplePaint == null) {
75            mRipplePaint = new Paint();
76            mRipplePaint.setAntiAlias(true);
77            mRipplePaint.setColor(0xffffffff);
78        }
79        return mRipplePaint;
80    }
81
82    private void drawSoftware(Canvas canvas) {
83        if (mGlowAlpha > 0f) {
84            final Paint p = getRipplePaint();
85            p.setAlpha((int)(mGlowAlpha * 255f));
86
87            final float w = getBounds().width();
88            final float h = getBounds().height();
89            final boolean horizontal = w > h;
90            final float diameter = getRippleSize() * mGlowScale;
91            final float radius = diameter * .5f;
92            final float cx = w * .5f;
93            final float cy = h * .5f;
94            final float rx = horizontal ? radius : cx;
95            final float ry = horizontal ? cy : radius;
96            final float corner = horizontal ? cy : cx;
97
98            canvas.drawRoundRect(cx - rx, cy - ry,
99                    cx + rx, cy + ry,
100                    corner, corner, p);
101        }
102    }
103
104    @Override
105    public void draw(Canvas canvas) {
106        mSupportHardware = canvas.isHardwareAccelerated();
107        if (mSupportHardware) {
108            drawHardware((DisplayListCanvas) canvas);
109        } else {
110            drawSoftware(canvas);
111        }
112    }
113
114    @Override
115    public void setAlpha(int alpha) {
116        // Not supported.
117    }
118
119    @Override
120    public void setColorFilter(ColorFilter colorFilter) {
121        // Not supported.
122    }
123
124    @Override
125    public int getOpacity() {
126        return PixelFormat.TRANSLUCENT;
127    }
128
129    private boolean isHorizontal() {
130        return getBounds().width() > getBounds().height();
131    }
132
133    private void drawHardware(DisplayListCanvas c) {
134        if (mDrawingHardwareGlow) {
135            c.drawRoundRect(mLeftProp, mTopProp, mRightProp, mBottomProp, mRxProp, mRyProp,
136                    mPaintProp);
137        }
138    }
139
140    public float getGlowAlpha() {
141        return mGlowAlpha;
142    }
143
144    public void setGlowAlpha(float x) {
145        mGlowAlpha = x;
146        invalidateSelf();
147    }
148
149    public float getGlowScale() {
150        return mGlowScale;
151    }
152
153    public void setGlowScale(float x) {
154        mGlowScale = x;
155        invalidateSelf();
156    }
157
158    @Override
159    protected boolean onStateChange(int[] state) {
160        boolean pressed = false;
161        for (int i = 0; i < state.length; i++) {
162            if (state[i] == android.R.attr.state_pressed) {
163                pressed = true;
164                break;
165            }
166        }
167        if (pressed != mPressed) {
168            setPressed(pressed);
169            mPressed = pressed;
170            return true;
171        } else {
172            return false;
173        }
174    }
175
176    @Override
177    public void jumpToCurrentState() {
178        cancelAnimations();
179    }
180
181    @Override
182    public boolean isStateful() {
183        return true;
184    }
185
186    public void setPressed(boolean pressed) {
187        if (mSupportHardware) {
188            setPressedHardware(pressed);
189        } else {
190            setPressedSoftware(pressed);
191        }
192    }
193
194    private void cancelAnimations() {
195        mTmpArray.addAll(mRunningAnimations);
196        int size = mTmpArray.size();
197        for (int i = 0; i < size; i++) {
198            Animator a = mTmpArray.get(i);
199            a.cancel();
200        }
201        mTmpArray.clear();
202        mRunningAnimations.clear();
203    }
204
205    private void setPressedSoftware(boolean pressed) {
206        if (pressed) {
207            enterSoftware();
208        } else {
209            exitSoftware();
210        }
211    }
212
213    private void enterSoftware() {
214        cancelAnimations();
215        mGlowAlpha = GLOW_MAX_ALPHA;
216        ObjectAnimator scaleAnimator = ObjectAnimator.ofFloat(this, "glowScale",
217                0f, GLOW_MAX_SCALE_FACTOR);
218        scaleAnimator.setInterpolator(mInterpolator);
219        scaleAnimator.setDuration(ANIMATION_DURATION_SCALE);
220        scaleAnimator.addListener(mAnimatorListener);
221        scaleAnimator.start();
222        mRunningAnimations.add(scaleAnimator);
223    }
224
225    private void exitSoftware() {
226        ObjectAnimator alphaAnimator = ObjectAnimator.ofFloat(this, "glowAlpha", mGlowAlpha, 0f);
227        alphaAnimator.setInterpolator(Interpolators.ALPHA_OUT);
228        alphaAnimator.setDuration(ANIMATION_DURATION_FADE);
229        alphaAnimator.addListener(mAnimatorListener);
230        alphaAnimator.start();
231        mRunningAnimations.add(alphaAnimator);
232    }
233
234    private void setPressedHardware(boolean pressed) {
235        if (pressed) {
236            enterHardware();
237        } else {
238            exitHardware();
239        }
240    }
241
242    /**
243     * Sets the left/top property for the round rect to {@code prop} depending on whether we are
244     * horizontal or vertical mode.
245     */
246    private void setExtendStart(CanvasProperty<Float> prop) {
247        if (isHorizontal()) {
248            mLeftProp = prop;
249        } else {
250            mTopProp = prop;
251        }
252    }
253
254    private CanvasProperty<Float> getExtendStart() {
255        return isHorizontal() ? mLeftProp : mTopProp;
256    }
257
258    /**
259     * Sets the right/bottom property for the round rect to {@code prop} depending on whether we are
260     * horizontal or vertical mode.
261     */
262    private void setExtendEnd(CanvasProperty<Float> prop) {
263        if (isHorizontal()) {
264            mRightProp = prop;
265        } else {
266            mBottomProp = prop;
267        }
268    }
269
270    private CanvasProperty<Float> getExtendEnd() {
271        return isHorizontal() ? mRightProp : mBottomProp;
272    }
273
274    private int getExtendSize() {
275        return isHorizontal() ? getBounds().width() : getBounds().height();
276    }
277
278    private int getRippleSize() {
279        int size = isHorizontal() ? getBounds().width() : getBounds().height();
280        return Math.min(size, mMaxWidth);
281    }
282
283    private void enterHardware() {
284        cancelAnimations();
285        mDrawingHardwareGlow = true;
286        setExtendStart(CanvasProperty.createFloat(getExtendSize() / 2));
287        final RenderNodeAnimator startAnim = new RenderNodeAnimator(getExtendStart(),
288                getExtendSize()/2 - GLOW_MAX_SCALE_FACTOR * getRippleSize()/2);
289        startAnim.setDuration(ANIMATION_DURATION_SCALE);
290        startAnim.setInterpolator(mInterpolator);
291        startAnim.addListener(mAnimatorListener);
292        startAnim.setTarget(mTargetView);
293
294        setExtendEnd(CanvasProperty.createFloat(getExtendSize() / 2));
295        final RenderNodeAnimator endAnim = new RenderNodeAnimator(getExtendEnd(),
296                getExtendSize()/2 + GLOW_MAX_SCALE_FACTOR * getRippleSize()/2);
297        endAnim.setDuration(ANIMATION_DURATION_SCALE);
298        endAnim.setInterpolator(mInterpolator);
299        endAnim.addListener(mAnimatorListener);
300        endAnim.setTarget(mTargetView);
301
302        if (isHorizontal()) {
303            mTopProp = CanvasProperty.createFloat(0f);
304            mBottomProp = CanvasProperty.createFloat(getBounds().height());
305            mRxProp = CanvasProperty.createFloat(getBounds().height()/2);
306            mRyProp = CanvasProperty.createFloat(getBounds().height()/2);
307        } else {
308            mLeftProp = CanvasProperty.createFloat(0f);
309            mRightProp = CanvasProperty.createFloat(getBounds().width());
310            mRxProp = CanvasProperty.createFloat(getBounds().width()/2);
311            mRyProp = CanvasProperty.createFloat(getBounds().width()/2);
312        }
313
314        mGlowScale = GLOW_MAX_SCALE_FACTOR;
315        mGlowAlpha = GLOW_MAX_ALPHA;
316        mRipplePaint = getRipplePaint();
317        mRipplePaint.setAlpha((int) (mGlowAlpha * 255));
318        mPaintProp = CanvasProperty.createPaint(mRipplePaint);
319
320        startAnim.start();
321        endAnim.start();
322        mRunningAnimations.add(startAnim);
323        mRunningAnimations.add(endAnim);
324
325        invalidateSelf();
326    }
327
328    private void exitHardware() {
329        mPaintProp = CanvasProperty.createPaint(getRipplePaint());
330        final RenderNodeAnimator opacityAnim = new RenderNodeAnimator(mPaintProp,
331                RenderNodeAnimator.PAINT_ALPHA, 0);
332        opacityAnim.setDuration(ANIMATION_DURATION_FADE);
333        opacityAnim.setInterpolator(Interpolators.ALPHA_OUT);
334        opacityAnim.addListener(mAnimatorListener);
335        opacityAnim.setTarget(mTargetView);
336
337        opacityAnim.start();
338        mRunningAnimations.add(opacityAnim);
339
340        invalidateSelf();
341    }
342
343    private final AnimatorListenerAdapter mAnimatorListener =
344            new AnimatorListenerAdapter() {
345        @Override
346        public void onAnimationEnd(Animator animation) {
347            mRunningAnimations.remove(animation);
348            if (mRunningAnimations.isEmpty() && !mPressed) {
349                mDrawingHardwareGlow = false;
350                invalidateSelf();
351            }
352        }
353    };
354
355    /**
356     * Interpolator with a smooth log deceleration
357     */
358    private static final class LogInterpolator implements Interpolator {
359        @Override
360        public float getInterpolation(float input) {
361            return 1 - (float) Math.pow(400, -input * 1.4);
362        }
363    }
364}
365