guga

    override fun onOffsetChanged(appBarLayout: AppBarLayout, verticalOffset: Int) {
        if(maxScrollSize == 0)
            maxScrollSize = appBarLayout.totalScrollRange

        val currentScrollPercentage = (Math.abs(verticalOffset)) * 100 / maxScrollSize

        if(currentScrollPercentage >= IMAGE_SHOW_PERCENT)
            if(!isImageHidden){
                isImageHidden = true
                ViewCompat.animate(reserveIconFAB).scaleY(0f).scaleX(0f).start()
            }
        if(currentScrollPercentage < IMAGE_SHOW_PERCENT)
            if(isImageHidden){
                isImageHidden = false
                ViewCompat.animate(reserveIconFAB).scaleY(1f).scaleX(1f).start()
            }
    }