android-35/android/inputmethodservice/navigationbar/KeyButtonRipple.java - platform/prebuilts/fullsdk/sources - Git at Google

 /*
  * Copyright (C) 2022 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package android.inputmethodservice.navigationbar;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.annotation.DimenRes;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.CanvasProperty;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.PixelFormat;
 import android.graphics.RecordingCanvas;
 import android.graphics.drawable.Drawable;
 import android.os.Handler;
 import android.os.Trace;
 import android.view.RenderNodeAnimator;
 import android.view.View;
 import android.view.ViewConfiguration;
 import android.view.animation.Interpolator;
 import android.view.animation.PathInterpolator;

 import java.util.ArrayList;
 import java.util.HashSet;

 final class KeyButtonRipple extends Drawable {

     private static final float GLOW_MAX_SCALE_FACTOR = 1.35f;
     private static final float GLOW_MAX_ALPHA = 0.2f;
     private static final float GLOW_MAX_ALPHA_DARK = 0.1f;
     private static final int ANIMATION_DURATION_SCALE = 350;
     private static final int ANIMATION_DURATION_FADE = 450;
     private static final Interpolator ALPHA_OUT_INTERPOLATOR =
             new PathInterpolator(0f, 0f, 0.8f, 1f);

     @DimenRes
     private final int mMaxWidthResource;

     private Paint mRipplePaint;
     private CanvasProperty<Float> mLeftProp;
     private CanvasProperty<Float> mTopProp;
     private CanvasProperty<Float> mRightProp;
     private CanvasProperty<Float> mBottomProp;
     private CanvasProperty<Float> mRxProp;
     private CanvasProperty<Float> mRyProp;
     private CanvasProperty<Paint> mPaintProp;
     private float mGlowAlpha = 0f;
     private float mGlowScale = 1f;
     private boolean mPressed;
     private boolean mVisible;
     private boolean mDrawingHardwareGlow;
     private int mMaxWidth;
     private boolean mLastDark;
     private boolean mDark;
     private boolean mDelayTouchFeedback;

     private final Interpolator mInterpolator = new LogInterpolator();
     private boolean mSupportHardware;
     private final View mTargetView;
     private final Handler mHandler = new Handler();

     private final HashSet<Animator> mRunningAnimations = new HashSet<>();
     private final ArrayList<Animator> mTmpArray = new ArrayList<>();

     private final TraceAnimatorListener mExitHwTraceAnimator =
             new TraceAnimatorListener("exitHardware");
     private final TraceAnimatorListener mEnterHwTraceAnimator =
             new TraceAnimatorListener("enterHardware");

     public enum Type {
         OVAL,
         ROUNDED_RECT
     }

     private Type mType = Type.ROUNDED_RECT;

     KeyButtonRipple(Context ctx, View targetView, @DimenRes int maxWidthResource) {
         mMaxWidthResource = maxWidthResource;
         mMaxWidth = ctx.getResources().getDimensionPixelSize(maxWidthResource);
         mTargetView = targetView;
     }

     public void updateResources() {
         mMaxWidth = mTargetView.getContext().getResources()
                 .getDimensionPixelSize(mMaxWidthResource);
         invalidateSelf();
     }

     public void setDarkIntensity(float darkIntensity) {
         mDark = darkIntensity >= 0.5f;
     }

     public void setDelayTouchFeedback(boolean delay) {
         mDelayTouchFeedback = delay;
     }

     public void setType(Type type) {
         mType = type;
     }

     private Paint getRipplePaint() {
         if (mRipplePaint == null) {
             mRipplePaint = new Paint();
             mRipplePaint.setAntiAlias(true);
             mRipplePaint.setColor(mLastDark ? 0xff000000 : 0xffffffff);
         }
         return mRipplePaint;
     }

     private void drawSoftware(Canvas canvas) {
         if (mGlowAlpha > 0f) {
             final Paint p = getRipplePaint();
             p.setAlpha((int) (mGlowAlpha * 255f));

             final float w = getBounds().width();
             final float h = getBounds().height();
             final boolean horizontal = w > h;
             final float diameter = getRippleSize() * mGlowScale;
             final float radius = diameter * .5f;
             final float cx = w * .5f;
             final float cy = h * .5f;
             final float rx = horizontal ? radius : cx;
             final float ry = horizontal ? cy : radius;
             final float corner = horizontal ? cy : cx;

             if (mType == Type.ROUNDED_RECT) {
                 canvas.drawRoundRect(cx - rx, cy - ry, cx + rx, cy + ry, corner, corner, p);
             } else {
                 canvas.save();
                 canvas.translate(cx, cy);
                 float r = Math.min(rx, ry);
                 canvas.drawOval(-r, -r, r, r, p);
                 canvas.restore();
             }
         }
     }

     @Override
     public void draw(Canvas canvas) {
         mSupportHardware = canvas.isHardwareAccelerated();
         if (mSupportHardware) {
             drawHardware((RecordingCanvas) canvas);
         } else {
             drawSoftware(canvas);
         }
     }

     @Override
     public void setAlpha(int alpha) {
         // Not supported.
     }

     @Override
     public void setColorFilter(ColorFilter colorFilter) {
         // Not supported.
     }

     @Override
     public int getOpacity() {
         return PixelFormat.TRANSLUCENT;
     }

     private boolean isHorizontal() {
         return getBounds().width() > getBounds().height();
     }

     private void drawHardware(RecordingCanvas c) {
         if (mDrawingHardwareGlow) {
             if (mType == Type.ROUNDED_RECT) {
                 c.drawRoundRect(mLeftProp, mTopProp, mRightProp, mBottomProp, mRxProp, mRyProp,
                         mPaintProp);
             } else {
                 CanvasProperty<Float> cx = CanvasProperty.createFloat(getBounds().width() / 2);
                 CanvasProperty<Float> cy = CanvasProperty.createFloat(getBounds().height() / 2);
                 int d = Math.min(getBounds().width(), getBounds().height());
                 CanvasProperty<Float> r = CanvasProperty.createFloat(1.0f * d / 2);
                 c.drawCircle(cx, cy, r, mPaintProp);
             }
         }
     }

     /** Gets the glow alpha, used by {@link android.animation.ObjectAnimator} via reflection. */
     public float getGlowAlpha() {
         return mGlowAlpha;
     }

     /** Sets the glow alpha, used by {@link android.animation.ObjectAnimator} via reflection. */
     public void setGlowAlpha(float x) {
         mGlowAlpha = x;
         invalidateSelf();
     }

     /** Gets the glow scale, used by {@link android.animation.ObjectAnimator} via reflection. */
     public float getGlowScale() {
         return mGlowScale;
     }

     /** Sets the glow scale, used by {@link android.animation.ObjectAnimator} via reflection. */
     public void setGlowScale(float x) {
         mGlowScale = x;
         invalidateSelf();
     }

     private float getMaxGlowAlpha() {
         return mLastDark ? GLOW_MAX_ALPHA_DARK : GLOW_MAX_ALPHA;
     }

     @Override
     protected boolean onStateChange(int[] state) {
         boolean pressed = false;
         for (int i = 0; i < state.length; i++) {
             if (state[i] == android.R.attr.state_pressed) {
                 pressed = true;
                 break;
             }
         }
         if (pressed != mPressed) {
             setPressed(pressed);
             mPressed = pressed;
             return true;
         } else {
             return false;
         }
     }

     @Override
     public boolean setVisible(boolean visible, boolean restart) {
         boolean changed = super.setVisible(visible, restart);
         if (changed) {
             // End any existing animations when the visibility changes
             jumpToCurrentState();
         }
         return changed;
     }

     @Override
     public void jumpToCurrentState() {
         endAnimations("jumpToCurrentState", false /* cancel */);
     }

     @Override
     public boolean isStateful() {
         return true;
     }

     @Override
     public boolean hasFocusStateSpecified() {
         return true;
     }

     public void setPressed(boolean pressed) {
         if (mDark != mLastDark && pressed) {
             mRipplePaint = null;
             mLastDark = mDark;
         }
         if (mSupportHardware) {
             setPressedHardware(pressed);
         } else {
             setPressedSoftware(pressed);
         }
     }

     /**
      * Abort the ripple while it is delayed and before shown used only when setShouldDelayStartTouch
      * is enabled.
      */
     public void abortDelayedRipple() {
         mHandler.removeCallbacksAndMessages(null);
     }

     private void endAnimations(String reason, boolean cancel) {
         Trace.beginSection("KeyButtonRipple.endAnim: reason=" + reason + " cancel=" + cancel);
         Trace.endSection();
         mVisible = false;
         mTmpArray.addAll(mRunningAnimations);
         int size = mTmpArray.size();
         for (int i = 0; i < size; i++) {
             Animator a = mTmpArray.get(i);
             if (cancel) {
                 a.cancel();
             } else {
                 a.end();
             }
         }
         mTmpArray.clear();
         mRunningAnimations.clear();
         mHandler.removeCallbacksAndMessages(null);
     }

     private void setPressedSoftware(boolean pressed) {
         if (pressed) {
             if (mDelayTouchFeedback) {
                 if (mRunningAnimations.isEmpty()) {
                     mHandler.removeCallbacksAndMessages(null);
                     mHandler.postDelayed(this::enterSoftware, ViewConfiguration.getTapTimeout());
                 } else if (mVisible) {
                     enterSoftware();
                 }
             } else {
                 enterSoftware();
             }
         } else {
             exitSoftware();
         }
     }

     private void enterSoftware() {
         endAnimations("enterSoftware", true /* cancel */);
         mVisible = true;
         mGlowAlpha = getMaxGlowAlpha();
         ObjectAnimator scaleAnimator = ObjectAnimator.ofFloat(this, "glowScale",
                 0f, GLOW_MAX_SCALE_FACTOR);
         scaleAnimator.setInterpolator(mInterpolator);
         scaleAnimator.setDuration(ANIMATION_DURATION_SCALE);
         scaleAnimator.addListener(mAnimatorListener);
         scaleAnimator.start();
         mRunningAnimations.add(scaleAnimator);

         // With the delay, it could eventually animate the enter animation with no pressed state,
         // then immediately show the exit animation. If this is skipped there will be no ripple.
         if (mDelayTouchFeedback && !mPressed) {
             exitSoftware();
         }
     }

     private void exitSoftware() {
         ObjectAnimator alphaAnimator = ObjectAnimator.ofFloat(this, "glowAlpha", mGlowAlpha, 0f);
         alphaAnimator.setInterpolator(ALPHA_OUT_INTERPOLATOR);
         alphaAnimator.setDuration(ANIMATION_DURATION_FADE);
         alphaAnimator.addListener(mAnimatorListener);
         alphaAnimator.start();
         mRunningAnimations.add(alphaAnimator);
     }

     private void setPressedHardware(boolean pressed) {
         if (pressed) {
             if (mDelayTouchFeedback) {
                 if (mRunningAnimations.isEmpty()) {
                     mHandler.removeCallbacksAndMessages(null);
                     mHandler.postDelayed(this::enterHardware, ViewConfiguration.getTapTimeout());
                 } else if (mVisible) {
                     enterHardware();
                 }
             } else {
                 enterHardware();
             }
         } else {
             exitHardware();
         }
     }

     /**
      * Sets the left/top property for the round rect to {@code prop} depending on whether we are
      * horizontal or vertical mode.
      */
     private void setExtendStart(CanvasProperty<Float> prop) {
         if (isHorizontal()) {
             mLeftProp = prop;
         } else {
             mTopProp = prop;
         }
     }

     private CanvasProperty<Float> getExtendStart() {
         return isHorizontal() ? mLeftProp : mTopProp;
     }

     /**
      * Sets the right/bottom property for the round rect to {@code prop} depending on whether we are
      * horizontal or vertical mode.
      */
     private void setExtendEnd(CanvasProperty<Float> prop) {
         if (isHorizontal()) {
             mRightProp = prop;
         } else {
             mBottomProp = prop;
         }
     }

     private CanvasProperty<Float> getExtendEnd() {
         return isHorizontal() ? mRightProp : mBottomProp;
     }

     private int getExtendSize() {
         return isHorizontal() ? getBounds().width() : getBounds().height();
     }

     private int getRippleSize() {
         int size = isHorizontal() ? getBounds().width() : getBounds().height();
         return Math.min(size, mMaxWidth);
     }

     private void enterHardware() {
         endAnimations("enterHardware", true /* cancel */);
         mVisible = true;
         mDrawingHardwareGlow = true;
         setExtendStart(CanvasProperty.createFloat(getExtendSize() / 2));
         final RenderNodeAnimator startAnim = new RenderNodeAnimator(getExtendStart(),
                 getExtendSize() / 2 - GLOW_MAX_SCALE_FACTOR * getRippleSize() / 2);
         startAnim.setDuration(ANIMATION_DURATION_SCALE);
         startAnim.setInterpolator(mInterpolator);
         startAnim.addListener(mAnimatorListener);
         startAnim.setTarget(mTargetView);

         setExtendEnd(CanvasProperty.createFloat(getExtendSize() / 2));
         final RenderNodeAnimator endAnim = new RenderNodeAnimator(getExtendEnd(),
                 getExtendSize() / 2 + GLOW_MAX_SCALE_FACTOR * getRippleSize() / 2);
         endAnim.setDuration(ANIMATION_DURATION_SCALE);
         endAnim.setInterpolator(mInterpolator);
         endAnim.addListener(mAnimatorListener);
         endAnim.addListener(mEnterHwTraceAnimator);
         endAnim.setTarget(mTargetView);

         if (isHorizontal()) {
             mTopProp = CanvasProperty.createFloat(0f);
             mBottomProp = CanvasProperty.createFloat(getBounds().height());
             mRxProp = CanvasProperty.createFloat(getBounds().height() / 2);
             mRyProp = CanvasProperty.createFloat(getBounds().height() / 2);
         } else {
             mLeftProp = CanvasProperty.createFloat(0f);
             mRightProp = CanvasProperty.createFloat(getBounds().width());
             mRxProp = CanvasProperty.createFloat(getBounds().width() / 2);
             mRyProp = CanvasProperty.createFloat(getBounds().width() / 2);
         }

         mGlowScale = GLOW_MAX_SCALE_FACTOR;
         mGlowAlpha = getMaxGlowAlpha();
         mRipplePaint = getRipplePaint();
         mRipplePaint.setAlpha((int) (mGlowAlpha * 255));
         mPaintProp = CanvasProperty.createPaint(mRipplePaint);

         startAnim.start();
         endAnim.start();
         mRunningAnimations.add(startAnim);
         mRunningAnimations.add(endAnim);

         invalidateSelf();

         // With the delay, it could eventually animate the enter animation with no pressed state,
         // then immediately show the exit animation. If this is skipped there will be no ripple.
         if (mDelayTouchFeedback && !mPressed) {
             exitHardware();
         }
     }

     private void exitHardware() {
         mPaintProp = CanvasProperty.createPaint(getRipplePaint());
         final RenderNodeAnimator opacityAnim = new RenderNodeAnimator(mPaintProp,
                 RenderNodeAnimator.PAINT_ALPHA, 0);
         opacityAnim.setDuration(ANIMATION_DURATION_FADE);
         opacityAnim.setInterpolator(ALPHA_OUT_INTERPOLATOR);
         opacityAnim.addListener(mAnimatorListener);
         opacityAnim.addListener(mExitHwTraceAnimator);
         opacityAnim.setTarget(mTargetView);

         opacityAnim.start();
         mRunningAnimations.add(opacityAnim);

         invalidateSelf();
     }

     private final AnimatorListenerAdapter mAnimatorListener =
             new AnimatorListenerAdapter() {
                 @Override
                 public void onAnimationEnd(Animator animation) {
                     mRunningAnimations.remove(animation);
                     if (mRunningAnimations.isEmpty() && !mPressed) {
                         mVisible = false;
                         mDrawingHardwareGlow = false;
                         invalidateSelf();
                     }
                 }
             };

     private static final class TraceAnimatorListener extends AnimatorListenerAdapter {
         private final String mName;
         TraceAnimatorListener(String name) {
             mName = name;
         }

         @Override
         public void onAnimationStart(Animator animation) {
             Trace.beginSection("KeyButtonRipple.start." + mName);
             Trace.endSection();
         }

         @Override
         public void onAnimationCancel(Animator animation) {
             Trace.beginSection("KeyButtonRipple.cancel." + mName);
             Trace.endSection();
         }

         @Override
         public void onAnimationEnd(Animator animation) {
             Trace.beginSection("KeyButtonRipple.end." + mName);
             Trace.endSection();
         }
     }

     /**
      * Interpolator with a smooth log deceleration
      */
     private static final class LogInterpolator implements Interpolator {
         @Override
         public float getInterpolation(float input) {
             return 1 - (float) Math.pow(400, -input * 1.4);
         }
     }
 }
	/*
	* Copyright (C) 2022 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package android.inputmethodservice.navigationbar;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.ObjectAnimator;
	import android.annotation.DimenRes;
	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.CanvasProperty;
	import android.graphics.ColorFilter;
	import android.graphics.Paint;
	import android.graphics.PixelFormat;
	import android.graphics.RecordingCanvas;
	import android.graphics.drawable.Drawable;
	import android.os.Handler;
	import android.os.Trace;
	import android.view.RenderNodeAnimator;
	import android.view.View;
	import android.view.ViewConfiguration;
	import android.view.animation.Interpolator;
	import android.view.animation.PathInterpolator;

	import java.util.ArrayList;
	import java.util.HashSet;

	final class KeyButtonRipple extends Drawable {

	private static final float GLOW_MAX_SCALE_FACTOR = 1.35f;
	private static final float GLOW_MAX_ALPHA = 0.2f;
	private static final float GLOW_MAX_ALPHA_DARK = 0.1f;
	private static final int ANIMATION_DURATION_SCALE = 350;
	private static final int ANIMATION_DURATION_FADE = 450;
	private static final Interpolator ALPHA_OUT_INTERPOLATOR =
	new PathInterpolator(0f, 0f, 0.8f, 1f);

	@DimenRes
	private final int mMaxWidthResource;

	private Paint mRipplePaint;
	private CanvasProperty<Float> mLeftProp;
	private CanvasProperty<Float> mTopProp;
	private CanvasProperty<Float> mRightProp;
	private CanvasProperty<Float> mBottomProp;
	private CanvasProperty<Float> mRxProp;
	private CanvasProperty<Float> mRyProp;
	private CanvasProperty<Paint> mPaintProp;
	private float mGlowAlpha = 0f;
	private float mGlowScale = 1f;
	private boolean mPressed;
	private boolean mVisible;
	private boolean mDrawingHardwareGlow;
	private int mMaxWidth;
	private boolean mLastDark;
	private boolean mDark;
	private boolean mDelayTouchFeedback;

	private final Interpolator mInterpolator = new LogInterpolator();
	private boolean mSupportHardware;
	private final View mTargetView;
	private final Handler mHandler = new Handler();

	private final HashSet<Animator> mRunningAnimations = new HashSet<>();
	private final ArrayList<Animator> mTmpArray = new ArrayList<>();

	private final TraceAnimatorListener mExitHwTraceAnimator =
	new TraceAnimatorListener("exitHardware");
	private final TraceAnimatorListener mEnterHwTraceAnimator =
	new TraceAnimatorListener("enterHardware");

	public enum Type {
	OVAL,
	ROUNDED_RECT
	}

	private Type mType = Type.ROUNDED_RECT;

	KeyButtonRipple(Context ctx, View targetView, @DimenRes int maxWidthResource) {
	mMaxWidthResource = maxWidthResource;
	mMaxWidth = ctx.getResources().getDimensionPixelSize(maxWidthResource);
	mTargetView = targetView;
	}

	public void updateResources() {
	mMaxWidth = mTargetView.getContext().getResources()
	.getDimensionPixelSize(mMaxWidthResource);
	invalidateSelf();
	}

	public void setDarkIntensity(float darkIntensity) {
	mDark = darkIntensity >= 0.5f;
	}

	public void setDelayTouchFeedback(boolean delay) {
	mDelayTouchFeedback = delay;
	}

	public void setType(Type type) {
	mType = type;
	}

	private Paint getRipplePaint() {
	if (mRipplePaint == null) {
	mRipplePaint = new Paint();
	mRipplePaint.setAntiAlias(true);
	mRipplePaint.setColor(mLastDark ? 0xff000000 : 0xffffffff);
	}
	return mRipplePaint;
	}

	private void drawSoftware(Canvas canvas) {
	if (mGlowAlpha > 0f) {
	final Paint p = getRipplePaint();
	p.setAlpha((int) (mGlowAlpha * 255f));

	final float w = getBounds().width();
	final float h = getBounds().height();
	final boolean horizontal = w > h;
	final float diameter = getRippleSize() * mGlowScale;
	final float radius = diameter * .5f;
	final float cx = w * .5f;
	final float cy = h * .5f;
	final float rx = horizontal ? radius : cx;
	final float ry = horizontal ? cy : radius;
	final float corner = horizontal ? cy : cx;

	if (mType == Type.ROUNDED_RECT) {
	canvas.drawRoundRect(cx - rx, cy - ry, cx + rx, cy + ry, corner, corner, p);
	} else {
	canvas.save();
	canvas.translate(cx, cy);
	float r = Math.min(rx, ry);
	canvas.drawOval(-r, -r, r, r, p);
	canvas.restore();
	}
	}
	}

	@Override
	public void draw(Canvas canvas) {
	mSupportHardware = canvas.isHardwareAccelerated();
	if (mSupportHardware) {
	drawHardware((RecordingCanvas) canvas);
	} else {
	drawSoftware(canvas);
	}
	}

	@Override
	public void setAlpha(int alpha) {
	// Not supported.
	}

	@Override
	public void setColorFilter(ColorFilter colorFilter) {
	// Not supported.
	}

	@Override
	public int getOpacity() {
	return PixelFormat.TRANSLUCENT;
	}

	private boolean isHorizontal() {
	return getBounds().width() > getBounds().height();
	}

	private void drawHardware(RecordingCanvas c) {
	if (mDrawingHardwareGlow) {
	if (mType == Type.ROUNDED_RECT) {
	c.drawRoundRect(mLeftProp, mTopProp, mRightProp, mBottomProp, mRxProp, mRyProp,
	mPaintProp);
	} else {
	CanvasProperty<Float> cx = CanvasProperty.createFloat(getBounds().width() / 2);
	CanvasProperty<Float> cy = CanvasProperty.createFloat(getBounds().height() / 2);
	int d = Math.min(getBounds().width(), getBounds().height());
	CanvasProperty<Float> r = CanvasProperty.createFloat(1.0f * d / 2);
	c.drawCircle(cx, cy, r, mPaintProp);
	}
	}
	}

	/** Gets the glow alpha, used by {@link android.animation.ObjectAnimator} via reflection. */
	public float getGlowAlpha() {
	return mGlowAlpha;
	}

	/** Sets the glow alpha, used by {@link android.animation.ObjectAnimator} via reflection. */
	public void setGlowAlpha(float x) {
	mGlowAlpha = x;
	invalidateSelf();
	}

	/** Gets the glow scale, used by {@link android.animation.ObjectAnimator} via reflection. */
	public float getGlowScale() {
	return mGlowScale;
	}

	/** Sets the glow scale, used by {@link android.animation.ObjectAnimator} via reflection. */
	public void setGlowScale(float x) {
	mGlowScale = x;
	invalidateSelf();
	}

	private float getMaxGlowAlpha() {
	return mLastDark ? GLOW_MAX_ALPHA_DARK : GLOW_MAX_ALPHA;
	}

	@Override
	protected boolean onStateChange(int[] state) {
	boolean pressed = false;
	for (int i = 0; i < state.length; i++) {
	if (state[i] == android.R.attr.state_pressed) {
	pressed = true;
	break;
	}
	}
	if (pressed != mPressed) {
	setPressed(pressed);
	mPressed = pressed;
	return true;
	} else {
	return false;
	}
	}

	@Override
	public boolean setVisible(boolean visible, boolean restart) {
	boolean changed = super.setVisible(visible, restart);
	if (changed) {
	// End any existing animations when the visibility changes
	jumpToCurrentState();
	}
	return changed;
	}

	@Override
	public void jumpToCurrentState() {
	endAnimations("jumpToCurrentState", false /* cancel */);
	}

	@Override
	public boolean isStateful() {
	return true;
	}

	@Override
	public boolean hasFocusStateSpecified() {
	return true;
	}

	public void setPressed(boolean pressed) {
	if (mDark != mLastDark && pressed) {
	mRipplePaint = null;
	mLastDark = mDark;
	}
	if (mSupportHardware) {
	setPressedHardware(pressed);
	} else {
	setPressedSoftware(pressed);
	}
	}

	/**
	* Abort the ripple while it is delayed and before shown used only when setShouldDelayStartTouch
	* is enabled.
	*/
	public void abortDelayedRipple() {
	mHandler.removeCallbacksAndMessages(null);
	}

	private void endAnimations(String reason, boolean cancel) {
	Trace.beginSection("KeyButtonRipple.endAnim: reason=" + reason + " cancel=" + cancel);
	Trace.endSection();
	mVisible = false;
	mTmpArray.addAll(mRunningAnimations);
	int size = mTmpArray.size();
	for (int i = 0; i < size; i++) {
	Animator a = mTmpArray.get(i);
	if (cancel) {
	a.cancel();
	} else {
	a.end();
	}
	}
	mTmpArray.clear();
	mRunningAnimations.clear();
	mHandler.removeCallbacksAndMessages(null);
	}

	private void setPressedSoftware(boolean pressed) {
	if (pressed) {
	if (mDelayTouchFeedback) {
	if (mRunningAnimations.isEmpty()) {
	mHandler.removeCallbacksAndMessages(null);
	mHandler.postDelayed(this::enterSoftware, ViewConfiguration.getTapTimeout());
	} else if (mVisible) {
	enterSoftware();
	}
	} else {
	enterSoftware();
	}
	} else {
	exitSoftware();
	}
	}

	private void enterSoftware() {
	endAnimations("enterSoftware", true /* cancel */);
	mVisible = true;
	mGlowAlpha = getMaxGlowAlpha();
	ObjectAnimator scaleAnimator = ObjectAnimator.ofFloat(this, "glowScale",
	0f, GLOW_MAX_SCALE_FACTOR);
	scaleAnimator.setInterpolator(mInterpolator);
	scaleAnimator.setDuration(ANIMATION_DURATION_SCALE);
	scaleAnimator.addListener(mAnimatorListener);
	scaleAnimator.start();
	mRunningAnimations.add(scaleAnimator);

	// With the delay, it could eventually animate the enter animation with no pressed state,
	// then immediately show the exit animation. If this is skipped there will be no ripple.
	if (mDelayTouchFeedback && !mPressed) {
	exitSoftware();
	}
	}

	private void exitSoftware() {
	ObjectAnimator alphaAnimator = ObjectAnimator.ofFloat(this, "glowAlpha", mGlowAlpha, 0f);
	alphaAnimator.setInterpolator(ALPHA_OUT_INTERPOLATOR);
	alphaAnimator.setDuration(ANIMATION_DURATION_FADE);
	alphaAnimator.addListener(mAnimatorListener);
	alphaAnimator.start();
	mRunningAnimations.add(alphaAnimator);
	}

	private void setPressedHardware(boolean pressed) {
	if (pressed) {
	if (mDelayTouchFeedback) {
	if (mRunningAnimations.isEmpty()) {
	mHandler.removeCallbacksAndMessages(null);
	mHandler.postDelayed(this::enterHardware, ViewConfiguration.getTapTimeout());
	} else if (mVisible) {
	enterHardware();
	}
	} else {
	enterHardware();
	}
	} else {
	exitHardware();
	}
	}

	/**
	* Sets the left/top property for the round rect to {@code prop} depending on whether we are
	* horizontal or vertical mode.
	*/
	private void setExtendStart(CanvasProperty<Float> prop) {
	if (isHorizontal()) {
	mLeftProp = prop;
	} else {
	mTopProp = prop;
	}
	}

	private CanvasProperty<Float> getExtendStart() {
	return isHorizontal() ? mLeftProp : mTopProp;
	}

	/**
	* Sets the right/bottom property for the round rect to {@code prop} depending on whether we are
	* horizontal or vertical mode.
	*/
	private void setExtendEnd(CanvasProperty<Float> prop) {
	if (isHorizontal()) {
	mRightProp = prop;
	} else {
	mBottomProp = prop;
	}
	}

	private CanvasProperty<Float> getExtendEnd() {
	return isHorizontal() ? mRightProp : mBottomProp;
	}

	private int getExtendSize() {
	return isHorizontal() ? getBounds().width() : getBounds().height();
	}

	private int getRippleSize() {
	int size = isHorizontal() ? getBounds().width() : getBounds().height();
	return Math.min(size, mMaxWidth);
	}

	private void enterHardware() {
	endAnimations("enterHardware", true /* cancel */);
	mVisible = true;
	mDrawingHardwareGlow = true;
	setExtendStart(CanvasProperty.createFloat(getExtendSize() / 2));
	final RenderNodeAnimator startAnim = new RenderNodeAnimator(getExtendStart(),
	getExtendSize() / 2 - GLOW_MAX_SCALE_FACTOR * getRippleSize() / 2);
	startAnim.setDuration(ANIMATION_DURATION_SCALE);
	startAnim.setInterpolator(mInterpolator);
	startAnim.addListener(mAnimatorListener);
	startAnim.setTarget(mTargetView);

	setExtendEnd(CanvasProperty.createFloat(getExtendSize() / 2));
	final RenderNodeAnimator endAnim = new RenderNodeAnimator(getExtendEnd(),
	getExtendSize() / 2 + GLOW_MAX_SCALE_FACTOR * getRippleSize() / 2);
	endAnim.setDuration(ANIMATION_DURATION_SCALE);
	endAnim.setInterpolator(mInterpolator);
	endAnim.addListener(mAnimatorListener);
	endAnim.addListener(mEnterHwTraceAnimator);
	endAnim.setTarget(mTargetView);

	if (isHorizontal()) {
	mTopProp = CanvasProperty.createFloat(0f);
	mBottomProp = CanvasProperty.createFloat(getBounds().height());
	mRxProp = CanvasProperty.createFloat(getBounds().height() / 2);
	mRyProp = CanvasProperty.createFloat(getBounds().height() / 2);
	} else {
	mLeftProp = CanvasProperty.createFloat(0f);
	mRightProp = CanvasProperty.createFloat(getBounds().width());
	mRxProp = CanvasProperty.createFloat(getBounds().width() / 2);
	mRyProp = CanvasProperty.createFloat(getBounds().width() / 2);
	}

	mGlowScale = GLOW_MAX_SCALE_FACTOR;
	mGlowAlpha = getMaxGlowAlpha();
	mRipplePaint = getRipplePaint();
	mRipplePaint.setAlpha((int) (mGlowAlpha * 255));
	mPaintProp = CanvasProperty.createPaint(mRipplePaint);

	startAnim.start();
	endAnim.start();
	mRunningAnimations.add(startAnim);
	mRunningAnimations.add(endAnim);

	invalidateSelf();

	// With the delay, it could eventually animate the enter animation with no pressed state,
	// then immediately show the exit animation. If this is skipped there will be no ripple.
	if (mDelayTouchFeedback && !mPressed) {
	exitHardware();
	}
	}

	private void exitHardware() {
	mPaintProp = CanvasProperty.createPaint(getRipplePaint());
	final RenderNodeAnimator opacityAnim = new RenderNodeAnimator(mPaintProp,
	RenderNodeAnimator.PAINT_ALPHA, 0);
	opacityAnim.setDuration(ANIMATION_DURATION_FADE);
	opacityAnim.setInterpolator(ALPHA_OUT_INTERPOLATOR);
	opacityAnim.addListener(mAnimatorListener);
	opacityAnim.addListener(mExitHwTraceAnimator);
	opacityAnim.setTarget(mTargetView);

	opacityAnim.start();
	mRunningAnimations.add(opacityAnim);

	invalidateSelf();
	}

	private final AnimatorListenerAdapter mAnimatorListener =
	new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	mRunningAnimations.remove(animation);
	if (mRunningAnimations.isEmpty() && !mPressed) {
	mVisible = false;
	mDrawingHardwareGlow = false;
	invalidateSelf();
	}
	}
	};

	private static final class TraceAnimatorListener extends AnimatorListenerAdapter {
	private final String mName;
	TraceAnimatorListener(String name) {
	mName = name;
	}

	@Override
	public void onAnimationStart(Animator animation) {
	Trace.beginSection("KeyButtonRipple.start." + mName);
	Trace.endSection();
	}

	@Override
	public void onAnimationCancel(Animator animation) {
	Trace.beginSection("KeyButtonRipple.cancel." + mName);
	Trace.endSection();
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	Trace.beginSection("KeyButtonRipple.end." + mName);
	Trace.endSection();
	}
	}

	/**
	* Interpolator with a smooth log deceleration
	*/
	private static final class LogInterpolator implements Interpolator {
	@Override
	public float getInterpolation(float input) {
	return 1 - (float) Math.pow(400, -input * 1.4);
	}
	}
	}