Re: [XForms] How to use an idle_callback to run an animation? CODE APPENDED

[Werner Heisch]

Am Tue, 20 Dec 2016 15:35:43 -0800
schrieb Peter Rowat <address@hidden>:

Hi Peter,

I'm using the "idle_callback" in different programs, most of it long
runners. (SCADA programs).

I call the "idle_callback" in the main program, behind initialisations
  fl_initialize (..)
  and before showing the first form.
  fl_show_form( .. )

Works fine.

I assume, it has to be below of all that stuff which is processed by
fl_do_forms().


Regards
Werner


> Dear Jens,
> 
>    I have tried to follow the instructions for using an idle_callback
> but so far have been unable to make the program work.
> 
> The callback is registered in my “create_form_canvasform”, and the
> callback is declared, as per p.47 in the Library manual. As I
> understand it, the callback should be getting called continually when
> otherwise there’s nothing happening. But it is never called. My test
> idle_callback merely prints a number, no graphics at all.
> 
> I can’t see anything I’m doing wrong.
> 
> My program is derived from the demo “canvas.c”, and I’ll append a
> file with the relevant parts of the program. The main addition to
> “canvas.c” was to draw the path of the mouse in the canvas. 
> 
> I apologize for asking this sort of question so close to Christmas,
> but it’s been a major aim for me to have this (and much more) running
> by now.  Any suggestions greatly appreciated.  I’ll proceed to look
> at the xforms source-code.
> 
> Peter