public override bool OnTouchEvent(CoordinatorLayout parent, Java.Lang.Object cChild, MotionEvent ev)
{
var child = cChild.JavaCast <View>();
if (!child.IsShown)
{
return(false);
}
var action = ev.ActionMasked;
if (_state == StateDragging && action == MotionEventActions.Down)
{
return(true);
}
// Detect scroll direction for ignoring collapsible
if (_lastStableState == StateAnchorPoint && action == MotionEventActions.Move)
{
if (ev.GetY() > _initialY && !Collapsible)
{
Reset();
return(false);
}
}
if (_viewDragHelper == null)
{
_viewDragHelper = ViewDragHelper.Create(parent, _dragCallback);
}
_viewDragHelper.ProcessTouchEvent(ev);
if (action == MotionEventActions.Down)
{
Reset();
}
// The ViewDragHelper tries to capture only the top-most View. We have to explicitly tell it
// to capture the bottom sheet in case it is not captured and the touch slop is passed.
if (action == MotionEventActions.Move && !_ignoreEvents && System.Math.Abs(_initialY - ev.GetY()) > _viewDragHelper.TouchSlop)
{
_viewDragHelper.CaptureChildView(child, ev.GetPointerId(ev.ActionIndex));
}
return(!_ignoreEvents);
}