Update: [cairo] how to interface with an NSWindow (please help!)

[Travis Griggs]

On Feb 22, 2007, at 0:14, Travis Griggs wrote:

> I'm working on my VisualWorks Smalltalk interface to Cairo. In that  
> environment, I have easy access to any NSWindow I open, and the  
> ability to send objective-c messages. So what I do is basically:
>
> 1) fetch the class named NSGraphicsContext
> 2) id nsGC = [NSGraphicsContext graphicsContextWithWindow:  
> myNSWindow];
> 3) cgCtx = [nsGC graphicPort];
> 4) cairo_nquartz_surface_create_for_cg_context (cgCtx, 200, 200, 1);
>
> But when I do drawing ops on that surface, nothing happens. :( Am I  
> doing this right at all? Or is there a better/different way to do  
> it? Do I need to send additional messages to the NSGraphicsContext  
> or to the CGGraphicsContext (this is just a struct pointer,right?)?
>
> I'm using 1.2.6 (I think). I'm confused about the recent sent of  
> messages regarding osx apis and stability thereof. Should I upgrade  
> to the new snapshots for cairo?

So, I was wrong. It is doing something. Just not right away. All I  
have to do is hide the window and reexpose it and then it's there!  
Yay. I've tried ending my drawing sequence with a surface flush. But  
that doesn't have any affect. If I use finish, it shows up right  
away, but of course, none of it can be used anymore (have to recreate  
the cairo objects).

--
Travis Griggs
Objologist
"Every institution finally perishes by an excess of its own first  
principle." - Lord Acton



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