Re: [MACTCL] Mac OS X event loop

[Mats B. <ma...@pr...>]

Jim Ingham wrote:
> 
> On Saturday, October 20, 2001, at 03:19  AM, Mats Bengtsson wrote:
> 
> No, it doesn't "hijack the event loop completely".  It sets the function
> that the Tcl event loop calls to convert a native event to a Tcl event.
> IIRC (Bruce and I talked about this when he first did QTTcl, but it has
> been a while...) you look at the events on the stream, and if you get a
> "Play Movie" type event you handle it specially, and otherwise you send
> it on to the function that was in place beforehand (TkMacConvertEvent).
> 

Intercept is perhaps a better word for it. My point is that it stops other
extensions from doing the same thing.

> It would be much cleaner to have windows or subwindows register special
> handlers for events at the native level, than to have to re-route the
> whole event conversion mechanism.  Another way to do this is to rely on

Agree. Like WinProc in Win32, much better.

> the Handler chain mechanism in Carbon Events, and so any event that the
> Tk event converter doesn't recognize just gets sent up the chain, and
> you will have to register a Carbon Event handler to deal with it.
> 

Or perhaps the other way around, first low-level QT events etc., and then
dispatch them to Tk. The Win32 code in QuickTimeTcl works like this.
QT docs say that *all* events shall go through the "Is Player Event" handler,
at least the Pre-Carbon docs.

> I think something like this is what Jack needs as well.  I need to take
> a look at QTTcl again, figure out what things you need to do, and see if
> I can come up with a good solution for you.  I definitely want to get
> this working, QTTcl is a VERY cool extension.  But I never did like the
> way it worked before, since it meant that you had to get your hands on
> everybodies events to do something that was specific to your window...
> 

Agree, it's terrible.

> I want to get a better answer to the "how do I build any extensions at
> all" question first, then I will  look at this.  However, if you want to
> give it a try in the meantime, you are more than welcome.
> 

My PowerBook is too old for X, but I can anyway start to make some
Carbonization "in blindo". There are a few things that must be
rewritten.

/Mats