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/*
* Copyright 2018 Allan Wang
*
* 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 ca.allanwang.kau.ui
import android.animation.Animator
import android.animation.AnimatorListenerAdapter
import android.animation.ValueAnimator
import androidx.annotation.VisibleForTesting
import ca.allanwang.kau.kotlin.kauRemoveIf
/**
* Created by Allan Wang on 2017-11-10.
*
* Wrapper for value animator specifically dealing with progress values
* This is typically a float range of 0 to 1, but can be customized
* This differs in that everything can be done with simple listeners, which will be bundled
* and added to the backing [ValueAnimator]
*/
class ProgressAnimator private constructor() : ValueAnimator() {
companion object {
fun ofFloat(builder: ProgressAnimator.() -> Unit): ProgressAnimator = ProgressAnimator().apply {
setFloatValues(0f, 1f)
addUpdateListener { apply(it.animatedValue as Float) }
addListener(object : AnimatorListenerAdapter() {
override fun onAnimationStart(animation: Animator?, isReverse: Boolean) {
isCancelled = false
startActions.runAll()
}
override fun onAnimationCancel(animation: Animator?) {
isCancelled = true
cancelActions.runAll()
}
override fun onAnimationEnd(animation: Animator?) {
endActions.runAll()
isCancelled = false
}
})
}.apply(builder)
/**
* Gets output of a linear function starting at [start] when [progress] is 0 and [end] when [progress] is 1 at point [progress].
*/
fun progress(start: Float, end: Float, progress: Float): Float = start + (end - start) * progress
fun progress(start: Float, end: Float, progress: Float, min: Float, max: Float): Float = when {
min == max -> throw IllegalArgumentException("Progress range cannot be 0 (min == max == $min")
progress <= min -> start
progress >= max -> end
else -> {
val trueProgress = (progress - min) / (max - min)
start + (end - start) * trueProgress
}
}
}
private val animators: MutableList<ProgressDisposableAction> = mutableListOf()
@VisibleForTesting
internal val startActions: MutableList<ProgressDisposableRunnable> = mutableListOf()
@VisibleForTesting
internal val cancelActions: MutableList<ProgressDisposableRunnable> = mutableListOf()
@VisibleForTesting
internal val endActions: MutableList<ProgressDisposableRunnable> = mutableListOf()
var isCancelled: Boolean = false
private set
val animatorCount get() = animators.size
/**
* Converts an action to a disposable action
*/
private fun ProgressAction.asDisposable(): ProgressDisposableAction = { this(it); false }
private fun ProgressRunnable.asDisposable(): ProgressDisposableRunnable = { this(); false }
/**
* If [condition] applies, run the animator.
* @return [condition]
*/
private fun ProgressAction.runIf(condition: Boolean, progress: Float): Boolean {
if (condition) this(progress)
return condition
}
@VisibleForTesting
internal fun MutableList<ProgressDisposableRunnable>.runAll() = kauRemoveIf { it() }
@VisibleForTesting
internal fun apply(progress: Float) {
animators.kauRemoveIf { it(progress) }
}
fun withAnimator(action: ProgressAction) =
withDisposableAnimator(action.asDisposable())
/**
* Range animator. Multiples the range by the current float progress before emission
*/
fun withAnimator(from: Float, to: Float, action: ProgressAction) =
withDisposableAnimator(from, to, action.asDisposable())
fun withDisposableAnimator(action: ProgressDisposableAction) = animators.add(action)
fun withDisposableAnimator(from: Float, to: Float, action: ProgressDisposableAction) {
if (to != from) {
animators.add {
action(progress(from, to, it))
}
}
}
fun withRangeAnimator(min: Float, max: Float, start: Float, end: Float, progress: Float, action: ProgressAction) {
if (min >= max) {
throw IllegalArgumentException("Range animator must have min < max; currently min=$min, max=$max")
}
withDisposableAnimator {
when {
it > max -> true
it < min -> false
else -> {
action(progress(start, end, progress, min, max))
false
}
}
}
}
fun withPointAnimator(point: Float, action: ProgressAction) {
animators.add {
action.runIf(it >= point, it)
}
}
fun withDelayedStartAction(skipCount: Int, action: ProgressAction) {
var count = 0
animators.add {
action.runIf(count++ >= skipCount, it)
}
}
/**
* Start action to be called once when the animator first begins
*/
fun withStartAction(action: ProgressRunnable) = withDisposableStartAction(action.asDisposable())
fun withDisposableStartAction(action: ProgressDisposableRunnable) = startActions.add(action)
fun withCancelAction(action: ProgressRunnable) = withDisposableCancelAction(action.asDisposable())
fun withDisposableCancelAction(action: ProgressDisposableRunnable) = cancelActions.add(action)
fun withEndAction(action: ProgressRunnable) = withDisposableEndAction(action.asDisposable())
fun withDisposableEndAction(action: ProgressDisposableRunnable) = endActions.add(action)
fun reset() {
if (isRunning) cancel()
animators.clear()
startActions.clear()
cancelActions.clear()
endActions.clear()
isCancelled = false
}
}
private typealias ProgressAction = (Float) -> Unit
private typealias ProgressDisposableAction = (Float) -> Boolean
private typealias ProgressRunnable = () -> Unit
private typealias ProgressDisposableRunnable = () -> Boolean
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