Revision control
Copy as Markdown
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
package org.mozilla.focus.animation
import android.view.View
import android.view.animation.AlphaAnimation
import android.view.animation.Animation
/**
* Provides a simple alpha animation between Visible and Gone that is usable by
* any View
*
* #### This duplicates Transition functionality, and should not be expanded before
* approaches are compared
*/
object VisibilityAnimator {
fun animateVisibility(view: View, visible: Boolean) {
val (fromAlpha, toAlpha, toVisibility) = when (visible) {
true -> Triple(0f, 1f, View.VISIBLE)
false -> Triple(1f, 0f, View.GONE)
}
if (view.visibility == toVisibility) return
val animation = AlphaAnimation(fromAlpha, toAlpha).apply {
duration = 150
fillAfter = false
setAnimationListener(object : Animation.AnimationListener {
override fun onAnimationRepeat(animation: Animation?) {}
override fun onAnimationStart(animation: Animation?) {
view.visibility = View.VISIBLE
}
override fun onAnimationEnd(animation: Animation?) {
view.visibility = toVisibility
}
})
}
view.startAnimation(animation)
}
}