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package com.pitchedapps.frost.utils
import android.animation.Animator
import android.animation.AnimatorListenerAdapter
import android.animation.ValueAnimator
import android.view.animation.Interpolator
/**
* Created by Allan Wang on 2017-11-10.
*/
class ProgressAnimator private constructor(private vararg val values: Float) {
companion object {
inline fun ofFloat(crossinline builder: ProgressAnimator.() -> Unit) = ofFloat(0f, 1f) { builder() }
fun ofFloat(vararg values: Float, builder: ProgressAnimator.() -> Unit) = ProgressAnimator(*values).apply {
builder()
build()
}
}
private val animators: MutableList<(Float) -> Unit> = mutableListOf()
private val startActions: MutableList<() -> Unit> = mutableListOf()
private val endActions: MutableList<() -> Unit> = mutableListOf()
var duration: Long = -1L
var interpolator: Interpolator? = null
/**
* Add more changes to the [ValueAnimator] before running
*/
var extraConfigs: ValueAnimator.() -> Unit = {}
fun withAnimator(from: Float, to: Float, animator: (Float) -> Unit) = animators.add {
val range = to - from
animator(range * it + from)
}
fun withAnimator(animator: (Float) -> Unit) = animators.add(animator)
fun withAnimatorInv(animator: (Float) -> Unit) = animators.add { animator(1f - it) }
fun withStartAction(action: () -> Unit) = startActions.add(action)
fun withEndAction(action: () -> Unit) = endActions.add(action)
fun build() {
ValueAnimator.ofFloat(*values).apply {
if (this@ProgressAnimator.duration > 0L)
duration = this@ProgressAnimator.duration
if (this@ProgressAnimator.interpolator != null)
interpolator = this@ProgressAnimator.interpolator
addUpdateListener {
val progress = it.animatedValue as Float
animators.forEach { it(progress) }
}
addListener(object : AnimatorListenerAdapter() {
override fun onAnimationStart(animation: Animator?) {
startActions.forEach { it() }
}
override fun onAnimationEnd(animation: Animator?) {
endActions.forEach { it() }
}
})
extraConfigs()
start()
}
}
}
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