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package com.pitchedapps.frost.utils
import android.graphics.drawable.AnimatedVectorDrawable
import android.support.annotation.DrawableRes
import android.widget.ImageView
import ca.allanwang.kau.utils.drawable
/**
* Created by Allan Wang on 2017-07-29.
*
* Delegate for animated vector drawables with two states (start and end)
* Drawables are added lazily depending on the animation direction, and are verified upon load
* Should the bounded view not have an animated drawable upon animating, it is assumed
* that the user has switched the resource themselves and the delegate will not switch the resource
*/
interface AnimatedVectorContract {
fun animate()
fun animateReverse()
fun animateToggle()
val isAtStart: Boolean
fun bind(view: ImageView)
var animatedVectorListener: ((avd: AnimatedVectorDrawable, forwards: Boolean) -> Unit)?
}
class AnimatedVectorDelegate(
/**
* The res for the starting resource; must have parent tag animated-vector
*/
@param:DrawableRes val avdStart: Int,
/**
* The res for the ending resource; must have parent tag animated-vector
*/
@param:DrawableRes val avdEnd: Int,
/**
* The delegate will automatically set the start resource when bound
* If [emitOnBind] is true, it will also trigger the listener
*/
val emitOnBind: Boolean = true,
/**
* The optional listener that will be triggered every time the avd is switched by the delegate
*/
override var animatedVectorListener: ((avd: AnimatedVectorDrawable, forwards: Boolean) -> Unit)? = null
) : AnimatedVectorContract {
lateinit var view: ImageView
private var atStart = true
override val isAtStart: Boolean
get() = atStart
private val avd: AnimatedVectorDrawable?
get() = view.drawable as? AnimatedVectorDrawable
override fun bind(view: ImageView) {
this.view = view
view.context.drawable(avdStart) as? AnimatedVectorDrawable ?: throw IllegalArgumentException("AnimatedVectorDelegate has a starting drawable that isn't an avd")
view.context.drawable(avdEnd) as? AnimatedVectorDrawable ?: throw IllegalArgumentException("AnimatedVectorDelegate has an ending drawable that isn't an avd")
view.setImageResource(avdStart)
if (emitOnBind) animatedVectorListener?.invoke(avd!!, false)
}
override fun animate() = animateImpl(false)
override fun animateReverse() = animateImpl(true)
override fun animateToggle() = animateImpl(!atStart)
private fun animateImpl(toStart: Boolean) {
if ((atStart == toStart)) return L.d("AVD already at ${if (toStart) "start" else "end"}")
if (avd == null) return L.d("AVD null resource")//no longer using animated vector; do not modify
avd?.stop()
view.setImageResource(if (toStart) avdEnd else avdStart)
animatedVectorListener?.invoke(avd!!, !toStart)
atStart = toStart
avd?.start()
}
}
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