Re: beginSheetModalForWindow: and Distributed Objects

FROM : Andrew Kimpton
DATE : Wed Apr 30 23:29:18 2008

On Apr 30, 2008, at 3:59 PM, Michael Vannorsdel wrote:

> This is true of course but since he's getting loop mode issues I'm 
> just assuming either he's actually running a modal window or 
> displaying a sheet on a modal window.  If it's a normal stock sheet 
> there would have been no issues with NSConnection.


I'm simply calling beginSheetModalForWindow: on  a 'regular' window 
(this isn't a document based app - but the window in question isn't 
modal either).

So from Mike Ash's comments it seems like something else must be going 
on. What set me down this path is the comment in the docs for 
[NSApplcation beginSheet: modalForWindow: ...] (which I assume 
[NSAlert beginSheetModalForWindow: calls ?)

Use this method in cases where you do not need to do any additional 
background processing while your sheet runs. This method consumes only 
enough CPU time to process events and dispatch them to the action 
methods associated with the sheet. If you want to perform additional 
background processing, use runModalSession:together with an 
NSModalSession object instead.

The comment about additional background processing is confusing to me. 
Does handling messages on an NSConnection count as background 
processing ? Do I have to go to the expense of using runModalSession: 
(Mike Ash's comments seem to suggest not, it should 'just work')

Bottom line - it sounds like beginSheetModalForWindow shouldn't block 
connection handling but it seems to in my case - where should I look 
begin to look for the cause of this ?

Andrew 8-)



> On Apr 30, 2008, at 1:36 PM, Michael Ash wrote:
>

>> It definitely shouldn't be. A properly implemented sheet should run 
>> in
>> NSDefaultRunLoopMode, as sheets do not block the flow of program
>> execution. It's possible to have an application-modal sheet which 
>> runs
>> in NSModalPanelRunLoopMode, but this is a broken sheet.

>
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