[Mono-osx] Problems with C# events and properties on NSWindow
steven.orth at ni.com
Fri Aug 3 20:16:37 UTC 2012
About 6 weeks ago, I filed this bug report (recently updated):
When we updated to the latest version of MonoDevelop (220.127.116.11), our
MonoMac application manifested problems with NIOpenPanel.BeginSheet().
I've been able to reproduce the problem in a simple application that
merely adds (or removes, without adding) an event handler to any* C# event
on NSWindow. Accessing certain properties also causes the problem. In the
case of BeginSheet(), you never see the sheet, and your main window moves
down on the screen. "Dismissing" the sheet via the ESC key restores the
window to its original position.
* at least, all the ones I've tried
The code I used to break NSOpenPanel.BeginSheet() is in the .zip attached
to that bug report. I built the same project in MonoDevelop 3.0.2 and,
rather than having the broken BeginSheet(), you'll see the original
problem in the bug report -- zooming the window will utterly malfunction
and "squish" the window off the bottom of the screen.
Though I have confirmed this in-house, confirmation from others would be
appreciated. Digging into this a bit further reveals that using properties
/ events on NSWindow renders any custom NSWindowDelegate worthless -- it
will be replaced via a call to EnsureNSWindowDelegate() -- there is no
"chaining" of delegates, and it appears there's not a way to opt out of
the internally provided delegate. Bugs like this are making our work
increasingly difficult, as we become mistrustful of updates to
MonoDevelop, and end up struggling to ascertain whether "new" problems are
due to our own errors or the tools.
Thank you, and best regards,
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