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package reading.component.widget
import scala.collection.mutable.Map
import org.scalajs.dom.{ window, document }
import org.scalajs.dom.raw.HTMLElement
object Animate {
val animationFrames: Map[String, Int] = Map.empty
def apply(
id: String,
duration: Double,
transition: (Double, Double) => Double,
animate: (Double, HTMLElement) => Unit,
onEnd: => Unit = ()
): Unit =
animationFrames.get(id) match {
case Some(animationFrame) =>
()
case None =>
val animationFrame = window.requestAnimationFrame(ts =>
frame(id, ts, duration, transition, animate, onEnd)(ts))
animationFrames.put(id, animationFrame)
()
}
private def frame(
id: String,
start: Double,
duration: Double,
transition: (Double, Double) => Double,
animate: (Double, HTMLElement) => Unit,
onEnd: => Unit
)(
timestamp: Double
): Unit = {
document.getElementById(id).asInstanceOf[HTMLElement] match {
case element: HTMLElement =>
val elapsed = timestamp - start
if (elapsed < duration) {
animate(Transition.easeOut(elapsed, duration), element)
val animationFrame = window.requestAnimationFrame(frame(id, start, duration, transition, animate, onEnd))
animationFrames.put(id, animationFrame)
} else {
animate(1, element)
animationFrames.remove(id)
onEnd
}
case _ =>
val animationFrame = window.requestAnimationFrame(ts => frame(id, ts, duration, transition, animate, onEnd)(ts))
animationFrames.put(id, animationFrame)
}
()
}
}
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