protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
_page = (GesturedContentPage)e.NewElement;
// Subscribe to the events here
if (_page.CaptureSwipeRightToLeft)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeRightToLeft())
{
Direction = UISwipeGestureRecognizerDirection.Left
});
}
if (_page.CaptureSwipeLeftToRight)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeLeftToRight())
{
Direction = UISwipeGestureRecognizerDirection.Right
});
}
if (_page.CaptureSwipeBottomToTop)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeBottomToTop())
{
Direction = UISwipeGestureRecognizerDirection.Up
});
}
if (_page.CaptureSwipeTopToBottom)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeTopToBottom())
{
Direction = UISwipeGestureRecognizerDirection.Down
});
}
if (_page.CaptureTap)
{
NativeView.AddGestureRecognizer(new UITapGestureRecognizer(g => _page.OnTap())
{
NumberOfTapsRequired = 1
});
}
if (_page.CaptureLongTap)
{
NativeView.AddGestureRecognizer(new UILongPressGestureRecognizer(g => _page.OnLongTap()));
}
}
public bool OnFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
// Right to left swipe
if (e1.GetX() - e2.GetX() > MinSwipeDistance &&
Math.Abs(velocityX) > SwipeThreadsholdVelocity)
{
if (_page.CaptureSwipeRightToLeft)
{
_page.OnSwipeRightToLeft();
}
}
// Left to right swipe
else if (e2.GetX() - e1.GetX() > MinSwipeDistance &&
Math.Abs(velocityX) > SwipeThreadsholdVelocity)
{
if (_page.CaptureSwipeLeftToRight)
{
_page.OnSwipeLeftToRight();
}
}
if (e1.GetY() - e2.GetY() > MinSwipeDistance &&
Math.Abs(velocityY) > SwipeThreadsholdVelocity)
{
if (_page.CaptureSwipeBottomToTop)
{
_page.OnSwipeBottomToTop();
}
}
// Left to right swipe
else if (e2.GetY() - e1.GetY() > MinSwipeDistance &&
Math.Abs(velocityY) > SwipeThreadsholdVelocity)
{
if (_page.CaptureSwipeTopToBottom)
{
_page.OnSwipeTopToBottom();
}
}
return(true);
}