CoordinatorLayoutでBottomの要素を消す挙動をするBehavior

BottomWidgetBehavior.kt

class BottomWidgetBehavior<V : View>(context: Context, attrs: AttributeSet) :
    CoordinatorLayout.Behavior<V>(context, attrs) {

    override fun onStartNestedScroll(
        coordinatorLayout: CoordinatorLayout,
        child: V,
        directTargetChild: View,
        target: View,
        axes: Int,
        type: Int
    ): Boolean {
        Timber.d("axes ---> $axes")
        return axes == ViewCompat.SCROLL_AXIS_VERTICAL
    }

    override fun onNestedPreScroll(
        coordinatorLayout: CoordinatorLayout,
        child: V,
        target: View,
        dx: Int,
        dy: Int,
        consumed: IntArray,
        type: Int
    ) {
        super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type)
        child.translationY =
            kotlin.math.max(
                0f,
                kotlin.math.min(
                    child.height.toFloat() + child.marginBottom,
                    child.translationY + dy
                )
            )
    }
}