package com.android.launcher3.anim; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.ValueAnimator; import android.graphics.Outline; import android.graphics.Rect; import android.view.View; import android.view.ViewOutlineProvider; import com.android.launcher3.Utilities; /** * A {@link ViewOutlineProvider} that has helper functions to create reveal animations. * This class should be extended so that subclasses can define the reveal shape as the * animation progresses from 0 to 1. */ public abstract class RevealOutlineAnimation extends ViewOutlineProvider { protected Rect mOutline; protected float mOutlineRadius; public RevealOutlineAnimation() { mOutline = new Rect(); } /** Returns whether elevation should be removed for the duration of the reveal animation. */ abstract boolean shouldRemoveElevationDuringAnimation(); /** Sets the progress, from 0 to 1, of the reveal animation. */ abstract void setProgress(float progress); public ValueAnimator createRevealAnimator(final View revealView, boolean isReversed) { ValueAnimator va = isReversed ? ValueAnimator.ofFloat(1f, 0f) : ValueAnimator.ofFloat(0f, 1f); final float elevation = revealView.getElevation(); va.addListener(new AnimatorListenerAdapter() { private boolean mIsClippedToOutline; private ViewOutlineProvider mOldOutlineProvider; public void onAnimationStart(Animator animation) { mIsClippedToOutline = revealView.getClipToOutline(); mOldOutlineProvider = revealView.getOutlineProvider(); revealView.setOutlineProvider(RevealOutlineAnimation.this); revealView.setClipToOutline(true); if (shouldRemoveElevationDuringAnimation()) { revealView.setTranslationZ(-elevation); } } public void onAnimationEnd(Animator animation) { revealView.setOutlineProvider(mOldOutlineProvider); revealView.setClipToOutline(mIsClippedToOutline); if (shouldRemoveElevationDuringAnimation()) { revealView.setTranslationZ(0); } } }); va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator arg0) { float progress = (Float) arg0.getAnimatedValue(); setProgress(progress); revealView.invalidateOutline(); if (!Utilities.ATLEAST_LOLLIPOP_MR1) { revealView.invalidate(); } } }); return va; } @Override public void getOutline(View v, Outline outline) { outline.setRoundRect(mOutline, mOutlineRadius); } public float getRadius() { return mOutlineRadius; } public void getOutline(Rect out) { out.set(mOutline); } }