KeyButtonRipple.java revision b9e290c7136fb7c76b7238426ccd598dec2d2643 
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.HardwareCanvas;
30import android.view.RenderNodeAnimator;
31import android.view.View;
32import android.view.animation.Interpolator;
33
34import com.android.systemui.R;
35import com.android.systemui.statusbar.phone.PhoneStatusBar;
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 final Interpolator mAlphaExitInterpolator = PhoneStatusBar.ALPHA_OUT;
63    private boolean mSupportHardware;
64    private final View mTargetView;
65
66    private final HashSet<Animator> mRunningAnimations = new HashSet<>();
67    private final ArrayList<Animator> mTmpArray = new ArrayList<>();
68
69    public KeyButtonRipple(Context ctx, View targetView) {
70        mMaxWidth =  ctx.getResources().getDimensionPixelSize(R.dimen.key_button_ripple_max_width);
71        mTargetView = targetView;
72    }
73
74    private Paint getRipplePaint() {
75        if (mRipplePaint == null) {
76            mRipplePaint = new Paint();
77            mRipplePaint.setAntiAlias(true);
78            mRipplePaint.setColor(0xffffffff);
79        }
80        return mRipplePaint;
81    }
82
83    private void drawSoftware(Canvas canvas) {
84        if (mGlowAlpha > 0f) {
85            final Paint p = getRipplePaint();
86            p.setAlpha((int)(mGlowAlpha * 255f));
87
88            final float w = getBounds().width();
89            final float h = getBounds().height();
90            final boolean horizontal = w > h;
91            final float diameter = getRippleSize() * mGlowScale;
92            final float radius = diameter * .5f;
93            final float cx = w * .5f;
94            final float cy = h * .5f;
95            final float rx = horizontal ? radius : cx;
96            final float ry = horizontal ? cy : radius;
97            final float corner = horizontal ? cy : cx;
98
99            canvas.drawRoundRect(cx - rx, cy - ry,
100                    cx + rx, cy + ry,
101                    corner, corner, p);
102        }
103    }
104
105    @Override
106    public void draw(Canvas canvas) {
107        mSupportHardware = canvas.isHardwareAccelerated();
108        if (mSupportHardware) {
109            drawHardware((HardwareCanvas) canvas);
110        } else {
111            drawSoftware(canvas);
112        }
113    }
114
115    @Override
116    public void setAlpha(int alpha) {
117        // Not supported.
118    }
119
120    @Override
121    public void setColorFilter(ColorFilter cf) {
122        // Not supported.
123    }
124
125    @Override
126    public int getOpacity() {
127        return PixelFormat.TRANSLUCENT;
128    }
129
130    private boolean isHorizontal() {
131        return getBounds().width() > getBounds().height();
132    }
133
134    private void drawHardware(HardwareCanvas c) {
135        if (mDrawingHardwareGlow) {
136            c.drawRoundRect(mLeftProp, mTopProp, mRightProp, mBottomProp, mRxProp, mRyProp,
137                    mPaintProp);
138        }
139    }
140
141    public float getGlowAlpha() {
142        return mGlowAlpha;
143    }
144
145    public void setGlowAlpha(float x) {
146        mGlowAlpha = x;
147        invalidateSelf();
148    }
149
150    public float getGlowScale() {
151        return mGlowScale;
152    }
153
154    public void setGlowScale(float x) {
155        mGlowScale = x;
156        invalidateSelf();
157    }
158
159    @Override
160    protected boolean onStateChange(int[] state) {
161        boolean pressed = false;
162        for (int i = 0; i < state.length; i++) {
163            if (state[i] == android.R.attr.state_pressed) {
164                pressed = true;
165                break;
166            }
167        }
168        if (pressed != mPressed) {
169            setPressed(pressed);
170            mPressed = pressed;
171            return true;
172        } else {
173            return false;
174        }
175    }
176
177    @Override
178    public void jumpToCurrentState() {
179        cancelAnimations();
180    }
181
182    @Override
183    public boolean isStateful() {
184        return true;
185    }
186
187    public void setPressed(boolean pressed) {
188        if (mSupportHardware) {
189            setPressedHardware(pressed);
190        } else {
191            setPressedSoftware(pressed);
192        }
193    }
194
195    private void cancelAnimations() {
196        mTmpArray.addAll(mRunningAnimations);
197        int size = mTmpArray.size();
198        for (int i = 0; i < size; i++) {
199            Animator a = mTmpArray.get(i);
200            a.cancel();
201        }
202        mTmpArray.clear();
203        mRunningAnimations.clear();
204    }
205
206    private void setPressedSoftware(boolean pressed) {
207        if (pressed) {
208            enterSoftware();
209        } else {
210            exitSoftware();
211        }
212    }
213
214    private void enterSoftware() {
215        cancelAnimations();
216        mGlowAlpha = GLOW_MAX_ALPHA;
217        ObjectAnimator scaleAnimator = ObjectAnimator.ofFloat(this, "glowScale",
218                0f, GLOW_MAX_SCALE_FACTOR);
219        scaleAnimator.setInterpolator(mInterpolator);
220        scaleAnimator.setDuration(ANIMATION_DURATION_SCALE);
221        scaleAnimator.addListener(mAnimatorListener);
222        scaleAnimator.start();
223        mRunningAnimations.add(scaleAnimator);
224    }
225
226    private void exitSoftware() {
227        ObjectAnimator alphaAnimator = ObjectAnimator.ofFloat(this, "glowAlpha", mGlowAlpha, 0f);
228        alphaAnimator.setInterpolator(mAlphaExitInterpolator);
229        alphaAnimator.setDuration(ANIMATION_DURATION_FADE);
230        alphaAnimator.addListener(mAnimatorListener);
231        alphaAnimator.start();
232        mRunningAnimations.add(alphaAnimator);
233    }
234
235    private void setPressedHardware(boolean pressed) {
236        if (pressed) {
237            enterHardware();
238        } else {
239            exitHardware();
240        }
241    }
242
243    /**
244     * Sets the left/top property for the round rect to {@code prop} depending on whether we are
245     * horizontal or vertical mode.
246     */
247    private void setExtendStart(CanvasProperty<Float> prop) {
248        if (isHorizontal()) {
249            mLeftProp = prop;
250        } else {
251            mTopProp = prop;
252        }
253    }
254
255    private CanvasProperty<Float> getExtendStart() {
256        return isHorizontal() ? mLeftProp : mTopProp;
257    }
258
259    /**
260     * Sets the right/bottom property for the round rect to {@code prop} depending on whether we are
261     * horizontal or vertical mode.
262     */
263    private void setExtendEnd(CanvasProperty<Float> prop) {
264        if (isHorizontal()) {
265            mRightProp = prop;
266        } else {
267            mBottomProp = prop;
268        }
269    }
270
271    private CanvasProperty<Float> getExtendEnd() {
272        return isHorizontal() ? mRightProp : mBottomProp;
273    }
274
275    private int getExtendSize() {
276        return isHorizontal() ? getBounds().width() : getBounds().height();
277    }
278
279    private int getRippleSize() {
280        int size = isHorizontal() ? getBounds().width() : getBounds().height();
281        return Math.min(size, mMaxWidth);
282    }
283
284    private void enterHardware() {
285        cancelAnimations();
286        mDrawingHardwareGlow = true;
287        setExtendStart(CanvasProperty.createFloat(getExtendSize() / 2));
288        final RenderNodeAnimator startAnim = new RenderNodeAnimator(getExtendStart(),
289                getExtendSize()/2 - GLOW_MAX_SCALE_FACTOR * getRippleSize()/2);
290        startAnim.setDuration(ANIMATION_DURATION_SCALE);
291        startAnim.setInterpolator(mInterpolator);
292        startAnim.addListener(mAnimatorListener);
293        startAnim.setTarget(mTargetView);
294
295        setExtendEnd(CanvasProperty.createFloat(getExtendSize() / 2));
296        final RenderNodeAnimator endAnim = new RenderNodeAnimator(getExtendEnd(),
297                getExtendSize()/2 + GLOW_MAX_SCALE_FACTOR * getRippleSize()/2);
298        endAnim.setDuration(ANIMATION_DURATION_SCALE);
299        endAnim.setInterpolator(mInterpolator);
300        endAnim.addListener(mAnimatorListener);
301        endAnim.setTarget(mTargetView);
302
303        if (isHorizontal()) {
304            mTopProp = CanvasProperty.createFloat(0f);
305            mBottomProp = CanvasProperty.createFloat(getBounds().height());
306            mRxProp = CanvasProperty.createFloat(getBounds().height()/2);
307            mRyProp = CanvasProperty.createFloat(getBounds().height()/2);
308        } else {
309            mLeftProp = CanvasProperty.createFloat(0f);
310            mRightProp = CanvasProperty.createFloat(getBounds().width());
311            mRxProp = CanvasProperty.createFloat(getBounds().width()/2);
312            mRyProp = CanvasProperty.createFloat(getBounds().width()/2);
313        }
314
315        mGlowScale = GLOW_MAX_SCALE_FACTOR;
316        mGlowAlpha = GLOW_MAX_ALPHA;
317        mRipplePaint = getRipplePaint();
318        mRipplePaint.setAlpha((int) (mGlowAlpha * 255));
319        mPaintProp = CanvasProperty.createPaint(mRipplePaint);
320
321        startAnim.start();
322        endAnim.start();
323        mRunningAnimations.add(startAnim);
324        mRunningAnimations.add(endAnim);
325
326        invalidateSelf();
327    }
328
329    private void exitHardware() {
330        mPaintProp = CanvasProperty.createPaint(getRipplePaint());
331        final RenderNodeAnimator opacityAnim = new RenderNodeAnimator(mPaintProp,
332                RenderNodeAnimator.PAINT_ALPHA, 0);
333        opacityAnim.setDuration(ANIMATION_DURATION_FADE);
334        opacityAnim.setInterpolator(mAlphaExitInterpolator);
335        opacityAnim.addListener(mAnimatorListener);
336        opacityAnim.setTarget(mTargetView);
337
338        opacityAnim.start();
339        mRunningAnimations.add(opacityAnim);
340
341        invalidateSelf();
342    }
343
344    private final AnimatorListenerAdapter mAnimatorListener =
345            new AnimatorListenerAdapter() {
346        @Override
347        public void onAnimationEnd(Animator animation) {
348            mRunningAnimations.remove(animation);
349            if (mRunningAnimations.isEmpty() && !mPressed) {
350                mDrawingHardwareGlow = false;
351                invalidateSelf();
352            }
353        }
354    };
355
356    /**
357     * Interpolator with a smooth log deceleration
358     */
359    private static final class LogInterpolator implements Interpolator {
360        @Override
361        public float getInterpolation(float input) {
362            return 1 - (float) Math.pow(400, -input * 1.4);
363        }
364    }
365}
366