Layout error when resizing window

danipendanipen USMember ✭✭
edited October 30 in Xamarin.Mac

Hi guys,

I'm experiencing a weird error. I was able to build a small sample that reproduces the issue. I hope you could help here. These are the steps to reproduce the problem:

  1. Open the attached project.
  2. Resize the window. Try to be exaggerated by changing the size.
  3. The following error appears in the application console:

    2017-10-30 11:43:41.946 NSScrollViewWheelExample[55949:737458] *** Assertion failure in -[NSBox _enableNeedsDisplayInRectNotifications], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1539.12/AppKit.subproj/NSView.m:18046
    2017-10-30 11:43:41.956 NSScrollViewWheelExample[55949:737458] It's not legal to call -layoutSubtreeIfNeeded on a view which is already being laid out.  If you are implementing the view's -layout method, you can call -[super layout] instead. Break on void _NSDetectedLayoutRecursion(void) to debug.  This will be logged only once.  This may break in the future.
    

After getting the error the mac window is totally broken (see attached picture):

Important notes:
1. If you comment the override void ScrollWheel(NSEvent theEvent), the problem dissapears.
2. If you add the view to the window using ContentView = scrollView; instead constraints, the problem dissapears.

The issue here is that I need to use constraints and also need to override the ScrollWheel event :-(

Any help would be appreciated.

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