Not working with hide_bottom_view_on_scroll_behavior

[shahrukhmlk]

It works fine with the appbar, all the scroll bahaviours in the parent coordinator layout work as expected for app bar. But if there is a Bottom Navigation View with @string/hide_bottom_view_on_scroll_behaviour, it does not hide when child coordinator layout views scroll.

[dsuresh-ap]

I got this to work by copying the logic in HideBottomViewOnScrollBehavior into my own behavior class and then overriding onNestedPreScroll.

override fun onNestedPreScroll(
        coordinatorLayout: CoordinatorLayout,
        child: BottomNavigationView,
        target: View,
        dx: Int,
        dy: Int,
        consumed: IntArray,
        type: Int
    ) {
        super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type)
        onNestedScroll(coordinatorLayout, child, target, dx, dy, consumed[0], consumed[1], type)
    }

    override fun onNestedScroll(
        coordinatorLayout: CoordinatorLayout,
        bottomNavigationView: BottomNavigationView,
        target: View,
        dxConsumed: Int,
        dyConsumed: Int,
        dxUnconsumed: Int,
        dyUnconsumed: Int
    ) {
       if (currentState != STATE_SCROLLED_DOWN && dyConsumed > 0) {
                slideDown(bottomNavigationView)
            } else if (currentState != STATE_SCROLLED_UP && dyConsumed < 0) {
                slideUp(bottomNavigationView)
            }
    }