Merge "Blocking alpha animation if the initial and final state for the... (171fbdbc) · Commits · e / os / BlissLauncher3

src/com/android/launcher3/util/MultiStateAlphaController.java

+46 −3

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@
		package com.android.launcher3.util;

		import android.animation.Animator;
		import android.animation.AnimatorListenerAdapter;
		import android.animation.ValueAnimator;
		import android.animation.ValueAnimator.AnimatorUpdateListener;
		import android.content.Context;
		@@ -33,6 +34,7 @@ public class MultiStateAlphaController {
		private final View mTargetView;
		private final float[] mAlphas;
		private final AccessibilityManager mAm;
		private int mZeroAlphaListenerCount = 0;

		public MultiStateAlphaController(View view, int stateCount) {
		mTargetView = view;
		@@ -44,12 +46,20 @@ public class MultiStateAlphaController {

		public void setAlphaAtIndex(float alpha, int index) {
		mAlphas[index] = alpha;
		updateAlpha();
		}

		private void updateAlpha() {
		// Only update the alpha if no zero-alpha animation is running.
		if (mZeroAlphaListenerCount > 0) {
		return;
		}
		float finalAlpha = 1;
		for (float a : mAlphas) {
		finalAlpha = finalAlpha * a;
		}
		mTargetView.setAlpha(finalAlpha);
		mTargetView.setVisibility(alpha > 0 ? View.VISIBLE
		mTargetView.setVisibility(finalAlpha > 0 ? View.VISIBLE
		: (mAm.isEnabled() ? View.GONE : View.INVISIBLE));
		}

		@@ -58,9 +68,11 @@ public class MultiStateAlphaController {
		* to {@param finalAlpha}. Alphas at other index are not affected.
		*/
		public Animator animateAlphaAtIndex(float finalAlpha, final int index) {
		final ValueAnimator anim;

		if (Float.compare(finalAlpha, mAlphas[index]) == 0) {
		// Return a dummy animator to avoid null checks.
		return ValueAnimator.ofFloat(0, 0);
		anim = ValueAnimator.ofFloat(0, 0);
		} else {
		ValueAnimator animator = ValueAnimator.ofFloat(mAlphas[index], finalAlpha);
		animator.addUpdateListener(new AnimatorUpdateListener() {
		@@ -70,7 +82,38 @@ public class MultiStateAlphaController {
		setAlphaAtIndex(value, index);
		}
		});
		return animator;
		anim = animator;
		}

		if (Float.compare(finalAlpha, 0f) == 0) {
		// In case when any channel is animating to 0, and the current alpha is also 0, do not
		// update alpha of the target view while the animation is running.
		// We special case '0' because if any channel is set to 0, values of other
		// channels do not matter.
		anim.addListener(new ZeroAlphaAnimatorListener());
		}
		return anim;
		}

		private class ZeroAlphaAnimatorListener extends AnimatorListenerAdapter {

		private boolean mStartedAtZero = false;

		@Override
		public void onAnimationStart(Animator animation) {
		mStartedAtZero = Float.compare(mTargetView.getAlpha(), 0f) == 0;
		if (mStartedAtZero) {
		mZeroAlphaListenerCount++;
		mTargetView.setAlpha(0);
		}
		}

		@Override
		public void onAnimationEnd(Animator animation) {
		if (mStartedAtZero) {
		mZeroAlphaListenerCount--;
		updateAlpha();
		}
		}
		}
		}