public override bool OnInterceptTouchEvent(MotionEvent ev)
{
var action = ev.Action;
if (action == MotionEventActions.Cancel || action == MotionEventActions.Up)
{
mDragHelper.Cancel();
return(false);
}
return(mDragHelper.ShouldInterceptTouchEvent(ev));
}
/// <summary>
/// Intercepts only touch events over the draggable view.
/// </summary>
/// <param name="ev"></param>
/// <returns></returns>
public override bool OnInterceptTouchEvent(MotionEvent ev)
{
try
{
bool handled = false;
if (Enabled)
{
handled = DragHelper.ShouldInterceptTouchEvent(ev) &&
DragHelper.IsViewUnder(DraggableView, (int)ev.GetX(), (int)ev.GetY());
}
else
{
DragHelper.Cancel();
}
return(handled || base.OnInterceptTouchEvent(ev));
}
catch (Exception e)
{
Methods.DisplayReportResultTrack(e);
return(base.OnInterceptTouchEvent(ev));
}
}
public override bool OnInterceptTouchEvent(MotionEvent ev)
{
var action = MotionEventCompat.GetActionMasked(ev);
if (!_canSlide || !SlidingEnabled || (_isUnableToDrag && action != (int)MotionEventActions.Down))
{
_dragHelper.Cancel();
return(base.OnInterceptTouchEvent(ev));
}
if (action == (int)MotionEventActions.Cancel || action == (int)MotionEventActions.Up)
{
_dragHelper.Cancel();
return(false);
}
var x = ev.GetX();
var y = ev.GetY();
var interceptTap = false;
switch (action)
{
case (int)MotionEventActions.Down:
_isUnableToDrag = false;
_initialMotionX = x;
_initialMotionY = y;
if (IsDragViewUnder((int)x, (int)y) && !IsUsingDragViewTouchEvents)
{
interceptTap = true;
}
break;
case (int)MotionEventActions.Move:
var adx = Math.Abs(x - _initialMotionX);
var ady = Math.Abs(y - _initialMotionY);
var dragSlop = _dragHelper.TouchSlop;
if (IsUsingDragViewTouchEvents)
{
if (adx > _scrollTouchSlop && ady < _scrollTouchSlop)
{
return(base.OnInterceptTouchEvent(ev));
}
if (ady > _scrollTouchSlop)
{
interceptTap = IsDragViewUnder((int)x, (int)y);
}
}
if ((ady > dragSlop && adx > ady) || !IsDragViewUnder((int)x, (int)y))
{
_dragHelper.Cancel();
_isUnableToDrag = true;
return(false);
}
break;
}
var interceptForDrag = _dragHelper.ShouldInterceptTouchEvent(ev);
return(interceptForDrag || interceptTap);
}
public override bool OnInterceptTouchEvent(CoordinatorLayout parent, Java.Lang.Object cChild, MotionEvent ev)
{
var child = cChild.JavaCast <View>();
if (!child.IsShown)
{
_ignoreEvents = true;
return(false);
}
var action = ev.ActionMasked;
if (action == MotionEventActions.Down)
{
Reset();
}
switch (action)
{
case MotionEventActions.Up:
case MotionEventActions.Cancel:
_touchingScrollingChild = false;
_activePointerId = MotionEvent.InvalidPointerId;
// Reset the ignore flag
if (_ignoreEvents)
{
_ignoreEvents = false;
return(false);
}
break;
case MotionEventActions.Down:
_scrollVelocityTracker.Clear();
int initialX = (int)ev.GetX();
_initialY = (int)ev.GetY();
if (_state == StateAnchorPoint)
{
_activePointerId = ev.GetPointerId(ev.ActionIndex);
_touchingScrollingChild = true;
}
else
{
_nestedScrollingChildRef.TryGetTarget(out View scroll);
if (scroll != null && parent.IsPointInChildBounds(scroll, initialX, _initialY))
{
_activePointerId = ev.GetPointerId(ev.ActionIndex);
_touchingScrollingChild = true;
}
}
_ignoreEvents = _activePointerId == MotionEvent.InvalidPointerId &&
!parent.IsPointInChildBounds(child, initialX, _initialY);
break;
case MotionEventActions.Move:
break;
}
if (!_ignoreEvents && _viewDragHelper.ShouldInterceptTouchEvent(ev))
{
return(true);
}
// We have to handle cases that the ViewDragHelper does not capture the bottom sheet because
// it is not the top most view of its parent. This is not necessary when the touch event is
// happening over the scrolling content as nested scrolling logic handles that case.
_nestedScrollingChildRef.TryGetTarget(out View scroll1);
return(action == MotionEventActions.Move && scroll1 != null &&
!_ignoreEvents && _state != StateDragging &&
!parent.IsPointInChildBounds(scroll1, (int)ev.GetX(), (int)ev.GetY()) &&
System.Math.Abs(_initialY - ev.GetY()) > _viewDragHelper.TouchSlop);
}
