Re: [Gnustep-cvs] r31213 - in /libs/gui/trunk: ChangeLog Source/NSMenuView.m Source/NSPopUpButtonCell.m

[Doug Simons]

Thanks for the suggestion, Kai. But the problem is that we'd like to not change 
existing GNUstep code in awkward ways. The code uses the standard 
nextEventMatchingMask:... method to get the next event, which inevitably calls 
some Windows function that allows the callbacks to come in.

Fortunately, after a lot of head scratching we've found a good solution, which 
I'll post in a moment in response to my earlier message.

Doug

On Oct 27, 2010, at 8:43 AM, SPUeNTRUP - Kai Henningsen wrote:

> Hallo Doug,
> 
> Am Tue, 26 Oct 2010 21:49:28 -0600
> schrieb Doug Simons <address@hidden>:
> 
>> 2. Figure out a more general solution for blocking callbacks from Windows 
>> while getting events. This would be ideal,
> 
> Surely those callbacks only happen when we call LRESULT DispatchMessage(const 
> MSG *lpmsg); ?
> 
> More precisely, the typical message loop looks like this:
> 
>    // Start the message loop. 
>    while( (bRet = GetMessage( &msg, NULL, 0, 0 )) != 0)
>    { 
>        if (bRet == -1)
>        {
>            // handle the error and possibly exit
>        }
>        else
>        {
>            TranslateMessage(&msg); 
>            DispatchMessage(&msg);   <<< callbacks happen here
>        }
>    } 
> 
> It's not as if windows does callbacks here without being explicitly
> asked to. Presumably, you could just as well queue messages up and
> dispatch them later, if that is more convenient. Or ignore them
> altogether.
> 
> For Windows API docs, see around here:
> 
> http://msdn.microsoft.com/en-us/library/ms644928%28v=VS.85%29.aspx#creating_loop
> 
> Mit freundlichen Grüßen aus Münster /
> with kind regards - Kai Henningsen
> 
> -- 
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