Re: cascading sheets and HIG

FROM : Nicholas Riley
DATE : Sat Jan 25 05:47:35 2003

On Fri, Jan 24, 2003 at 05:42:38PM -0700, Alex Rice wrote:
> The Cocoa docs say the correct way to handle "cascading" sheets is to
> present them one at a time, closing each one before opening the next.
> I'm in a situation where that would be a kind of a pain in the butt to
> implement.  So I'm breaking that rule and just throwing up a bunch of
> sheets with NSBeginAlertSheet(). I'm catching notifications in my NSApp
> delegate, which queries my NSDocumentController, decides what document
> and window the notification belongs to, and sends the sheet to that
> window. One sheet per notification.
>
> I've noticed that for Document windows that get more than one sheet,
> only sometimes I see the behaviour where the Window dissapears after
> the last sheet is dismissed, or I can't quit out of the app, or the
> Document window is empty and white. I have a didEndSelector, but it's
> not doing anything. So is "cascading" sheets like this just an HIG
> issue or is there something worse going on here?


Yes, this is broken.  Cocoa should really just prohibit it instead of
exhibiting flaky behavior.

--
=Nicholas Riley <<email_removed>> | <http://www.uiuc.edu/ph/www/njriley>
        Pablo Research Group, Department of Computer Science and
  Medical Scholars Program, University of Illinois at Urbana-Champaign
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