gpeal

/**
 * Fade a view to visible or gone. This function is idempotent - it can be called over and over again with the same 
 * value without affecting an in-progress animation.
 */
fun View.fadeTo(visible: Boolean, duration: Long = 500, startDelay: Long = 0, toAlpha: Float = 1f) {
    // Make this idempotent.
    val tagKey = "fadeTo".hashCode()
    if (visible == isVisible && animation == null && getTag(tagKey) == null) return
    if (getTag(tagKey) == visible) return