runAnimation

runAnimation.kt

private fun runAnimation(isReverse: Boolean): AnimatorSet {
    val values = if (isReverse) {
        floatArrayOf(1f, 0f)
    } else {
        floatArrayOf(0f, 1f)
    }
    val animatorList = listOf(
        ValueAnimator.ofFloat(*values).apply {
            addUpdateListener {
                colorBgFraction = it.animatedValue as Float
                colorTextFraction = it.animatedValue as Float
                invalidate()
            }
        },
        ValueAnimator.ofFloat(*values).apply {
            addUpdateListener {
                scaleTextFraction = it.animatedValue as Float
                morphFraction = it.animatedValue as Float
                invalidate()
            }
        },
        ValueAnimator.ofFloat(*values).apply {
            addUpdateListener {
                scaleIconFraction = it.animatedValue as Float
                invalidate()
            }
        }
    ).let {
        if (isReverse) {
            it.reversed()
        } else {
            it
        }
    }
    return AnimatorSet().apply {
        playSequentially(
            animatorList
        )
        interpolator = FastOutSlowInInterpolator()
        doOnStart {
            this@MorphButton.uiState = UIState.Animating
        }
        duration = 250L
        start()
    }
}