[scilab-Users] Main thread yield to graphics events

[François Vogel]

Hello Flemming,

The opteam enforced a wrong (IMO) fix into Scilab 5.1.1 in order to 
shut down user complaints about bug 2578 and duplicates. This "fix" 
did not think about event handlers. This problem is reported as bug 4196:

http://bugzilla.scilab.org/show_bug.cgi?id=4196

Good luck...
Francois


Flemming Nyboe said on 18/08/2009 22:46:
> Hi again,
> 
> I have discovered one thing regarding my question below, which I thought I
> would share here in case it could be useful to someone else.
> 
> The problem (see below) only occurs when a script has been started from
> scipad, by the 'Execute'->'Load into Scilab' menu command.
> However when the script is started from the Console, either by 'File' ->
> 'Execute', or from the command line using exec(), the graphics events will
> in fact fire.
> 
> Happy coding,
> Flemming, Denmark
> 
> -----Original Message-----
> From: Flemming Nyboe [mailto:flemming at nyboe.net] 
> Sent: 12 August 2009 08:36
> To: users at lists.scilab.org
> Subject: [scilab-Users] Main thread yield to graphics events
> 
> Hello,
> 
> I have an infinite while loop processing graphics in a figure. I'm trying to
> break the loop when the user closes the figure, but it seems that the
> execution thread never yields to the graphics events.
> 
> The below code does not end (print "done") when I close the figure.
> 
> 1) is there a way to force a "do-events" where graphics events are given
> time to fire?
> 2) alternatively, is there a way to detect if a keyboard key has been
> pressed without waiting if not.
> 
> Regards
> Flemming, Denmark
> 
> ----------------
> // detecting closed figure
> 
> function my_eventhandler(win,x,y,ibut)
>   global run
>   if ibut==-1000 then 
>     run=0;
>   end
> endfunction
> 
> global run
> run=1;
> 
> plot2d()
> seteventhandler('my_eventhandler')
> fh=gcf();
> 
> while run,
>  if (length(winsid())==0) then
>     run=0;
>  end
>  if ~is_handle_valid(fh) then
>    run=0;
>  end
> 
>  drawnow();
>  sleep(2);
> 
> end
> 
> seteventhandler('') //suppress the event handler
> 
> printf('done\n');
> ----------------
> 
> 
> 
> 
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