[PD-dev] pd parser + creating inlets/outlets outside of new-method
Krzysztof Czaja
czaja at chopin.edu.pl
Wed Apr 21 11:53:07 CEST 2004
hi Tom,
Tom Schouten wrote:
...
> any reason why canvas_current() only works in a constructor?
> i suppose this has to do with the canvas stack when loading a patch?
>
> when i want to have access to the canvas at all times, i should save it in
> the constructor, right?
right, canvas_getcurrent() returns 0, unless there is a glist pushed
on the #X-binding stack by someone calling canvas_setcurrent() first.
That binding is updated whenever an object is to be created -- from
a patch file, as well as interactively.
Btw, what you get from canvas_getcurrent() is the containing glist,
which may happen to be displayed on parent. So, if you need the
actual canvas, rather than just a glist, store that glist in the
constructor first, but then call glist_getcanvas() each time it is used.
Krzysztof
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