How to nest callback into while loop?

I write simple program with a while loop

Within the while loop in each cicle the figure with two buttons: "CONTINUE" and 'FINISH' created.

As expected, if one preses the CONTINUE button, the cicle repeats, in case of presing FINISH, the while loop is finishing.

The problem is that if callback functions for button place within the "while" loop the MATLAB says that callback function(s) is incorrectly nestled.

If callback functions for button place outside the "while" loop, after pressing one of the buttons the MATLAB says that 'event_data' in callback function is not recognized.

function [TGA] = TGA_MULTY_LOAD()
IndJ=0
while IndJ==0
  %TGA(:,:,:,IndJ+1)=TGA_LOAD() 
  
  TEST=1
  
Xa=500;
Ya=400;
La=500;
Wa=300;
p=80;
r=150;
s=150;
t=50;
p1=290;
r1=150;
s1=150;
t1=50;
STR_1='CONTINUE';
STR_2='FINISH'
T=[];

handles.cont_fig=figure('Name','Continue','MenuBar','none','Position',[Xa,Ya,La,Wa]);

handles.continue_button=uicontrol(handles.cont_fig,'style','pushbutton','string',STR_1,'FontWeight','bold','FontSize',14,'position',[p,r,s,t])
set(handles.continue_button,'callback',{@continue_callback,handles})

handles.finish_button=uicontrol(handles.cont_fig,'style','pushbutton','string',STR_2,'FontWeight','bold','FontSize',14,'position',[p1,r1,s1,t1])
set(handles.finish_button,'callback',{@finish_callback,handles})

IndJ1=0;

uiwait(gcf)

continue_callback(gcf,event_data,handles)
finish_callback(gcf,event_data,handles)

IndJ=IndJ1
end

    function continue_callback(gcf,event_data,handles)
  IndJ1=0
 close(handles.cont_fig)
    end
 
    function finish_callback(gcf,event_data,handles)
    IndJ1=1 
    
    close(handles.cont_fig)
  
 end
   
Q='End'
end

[Jan]

Please format your code properly. Use the standard indentation (press Ctrl-a Ctrl-i in the editor) and use the Code-button on top of the field for editing your question.

[Sergey Lopatnikov]

Thank you. Is it OK now?

Answer 1

[Geoff Hayes]

@Sergey Lopatnikov - the _'event_data' in callback function is not recognized_ error message makes sense since you are trying to use a variable doesn't exist. To avoid this error, just pass an empty array into the callback

continue_callback(gcf,[],handles)

But is this really what you want to do? After the call to uiwait, you call both the continue and finish callbacks

uiwait(gcf)
continue_callback(gcf,event_data,handles)
finish_callback(gcf,event_data,handles)

So which one should be called? Also, since you have already pushed a button, either Continue or Finish, then one of those callbacks will already fire. I think that you can remove these two lines altogether and just keep the

uiwait(gcf)

which will wait until the GUI closes (which you do in both the callbacks).

As an aside,do you want to close the GUI if the user continues? Why not re-use the same GUI for each iteration of the while loop (this would mean you would need to create the GUI outside of the loop)?

[Sergey Lopatnikov]

Thak you great,