[Scilab-users] uicontrol, callbacks, handle not valid anymore [SOLVED]

[Sandro Hardy]

Dear Serge,

thank you very much for your suggestion and the improvement of the code. 
It works fine now.

I just figured out that Scilab crashes, even with your code, if "Min", 
0, and I move the mouse to the left very fast (something I do not 
understand, because it is not always the case and only if I move the 
mouse really fast) but I can avoid this just keeping it at 1.

So thanks again
Sandro

Am 10.07.2013 22:25, schrieb Serge Steer:
> It is not a Scilab problem.
> It is better to preserve the plotfr handle in the user_data gui, so even if plotfr is cleared
> it can be retreived.
>
> Moreover I had improved a little your code to makemove more smooth (avoid clf and udpdate the polyline and axes bounds
>
> Serge Steer
>
> ----- Mail original -----
>> De: "Sandro Hardy" <sandro.hardy at kom.tu-darmstadt.de>
>> À: "International users mailing list for Scilab." <users at lists.scilab.org>
>> Envoyé: Mercredi 10 Juillet 2013 20:24:19
>> Objet: [Scilab-users] uicontrol, callbacks, handle not valid anymore
>>
>> Hello everybody,
>>
>> I am trying to create a GUI to scroll trough a signal using a slider.
>>
>> I always get a "Handle not valid anymore", looking as shown below. Is
>> this a bug in Scilab?
>>
>> Using the arrows works fine, but dragging the slider with the mouse
>> produces the error. Maybe it is a timing/scheduling problem in
>> Scilab.
>>
>> Please find example code below, if you like to reproduce this.
>>
>> I would be happy about any hint.
>> Best wishes
>> Sandro
>>
>>
>> ------------------------------------------
>> !--error 999
>> set: diese Handhabung ist nicht mehr gültig.
>> at line       4 of function generic_i_h called by :
>> at line       2 of function %s_i_h called by :
>> at line     381 of function plot called by :
>> at line       7 of function slider_update called by :
>> df0:13fc997f6bd:-2f41");slider_update;if exists(
>> while executing a callback
>> at line     352 of function plot called by :
>> at line       7 of function slider_update called by :
>> df0:13fc997f6bd:-2f41");slider_update;if exists(
>> while executing a callback
>> at line       2 of function %h_e called by :
>> at line      33 of function findobj called by :
>> at line       2 of function slider_update called by :
>> df0:13fc997f6bd:-2f41");slider_update;if exists(
>> while executing a callback
>>
>> ------------------------------------
>> clear
>> clearglobal
>>
>> maxv=1000;
>> x=1:0.1:maxv;
>> y=sin(x);
>>
>> function slider_update()
>>       slider=findobj('Tag', 'plot_slider')
>>       start=round(slider.Value*0.9);
>>       r=start:start+100;
>>       scf(plotfr)
>>       clf(plotfr)
>>       plot(x(r),y(r));
>> endfunction
>>
>> // Create a figure
>> f = figure("Figure_name", 'Uicontrols Slider',...
>>       "Position",[100 100 510 510],...
>>       "BackgroundColor",[0.9 0.9 0.9],...
>>       "Tag", "uicontrols_demo_figure");
>> // Frame containing a slider
>>
>> plotfr = figure("Figure_name", 'Uicontrols Plot',...
>>       "Position",[100 100 510 510],...
>>       "BackgroundColor",[0.9 0.9 0.9],...
>>       "Tag", "uicontrols_demo_figure2");
>>
>> slider = uicontrol(f, "Position", [20 50 390 15], ...
>>       "Style", "slider", ...
>>       "Min", 0, ...
>>       "Max", 900, ...
>>       "Value", 0, ...
>>       "SliderStep", [10 100], ...
>>       "Tag", "plot_slider", ...
>>       "Callback", "slider_update");
>> --------------------------------------------------
>> --
>> Sandro Hardy, M.Sc.
>>
>> Multimedia Communications Lab (KOM)
>> http://www.kom.tu-darmstadt.de
>> Technische Universitaet Darmstadt
>> Dept. of Electrical Engineering & Information Technology
>> tel: +49 6151 16 75164 fax: +49 6151 16 6152
>> E-Mail: Sandro.Hardy at kom.tu-darmstadt.de
>> postal address: TU Darmstadt, FB 18, KOM, Rundeturmstr. 10, S320/106
>> D-64283 Darmstadt, Germany
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