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/*
* 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 com.android.systemui.media.controls.ui
import android.animation.Animator
import android.animation.AnimatorListenerAdapter
/**
* MetadataAnimationHandler controls the current state of the MediaControlPanel's transition motion.
*
* It checks for a changed data object (artist & title from MediaControlPanel) and runs the
* animation if necessary. When the motion has fully transitioned the elements out, it runs the
* update callback to modify the view data, before the enter animation runs.
*/
internal open class MetadataAnimationHandler(
private val exitAnimator: Animator,
private val enterAnimator: Animator
) : AnimatorListenerAdapter() {
private var postExitUpdate: (() -> Unit)? = null
private var postEnterUpdate: (() -> Unit)? = null
private var targetData: Any? = null
val isRunning: Boolean
get() = enterAnimator.isRunning || exitAnimator.isRunning
fun setNext(targetData: Any, postExit: () -> Unit, postEnter: () -> Unit): Boolean {
if (targetData != this.targetData) {
this.targetData = targetData
postExitUpdate = postExit
postEnterUpdate = postEnter
if (!isRunning) {
exitAnimator.start()
}
return true
}
return false
}
override fun onAnimationEnd(anim: Animator) {
if (anim === exitAnimator) {
postExitUpdate?.let { it() }
postExitUpdate = null
enterAnimator.start()
}
if (anim === enterAnimator) {
// Another new update appeared while entering
if (postExitUpdate != null) {
exitAnimator.start()
} else {
postEnterUpdate?.let { it() }
postEnterUpdate = null
}
}
}
init {
exitAnimator.addListener(this)
enterAnimator.addListener(this)
}
}
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