problem with waitbar cancel button

Question

Jim O'Doherty 2012-10-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/49978-problem-with-waitbar-cancel-button

评论： Ali Yar Khan 2020-1-31

All,

I'm encountering a little problem with a cancel button on a waitbar. I can get the Matlab example in the help file to work perfectly, although for some reason when I try it in my code, it does not seem to acknowledge the callback for the cancel button. Heres what I have:

   hWaitBar = waitbar(0, '',...     
              'Name', 'LOADING IMAGES - PLEASE WAIT...',...     
              'CreateCancelBtn','setappdata(gcbf,''Canceling'',1)'); 
          setappdata(hWaitBar,'Canceling',0) 
for i=3:size(filelist,1)                                
%do stuff here
getappdata(hWaitBar,'Canceling')
       % Check for Cancel button press
      ch = getappdata(hWaitBar, 'Canceling')
      if getappdata(hWaitBar,'Canceling') ==1
          break
      end
              waitbar(i/size(filelist,1),hWaitBar)
      end  
delete(hWaitBar)

The check command 'getappdata(hWaitBar,'Canceling')' inside the loop never returns the value of 1, which it should do from the callback defined in hWaitBar.

The only difference I can think of between the matlab example and my code is that all my above code is located in a set if-else loops (4 deep). Would this be responsible?

Thanks

Jim

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Answer 1

Walter Roberson 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49978-problem-with-waitbar-cancel-button#answer_61078

Try adding a drawnow() call inside the loop, so that the callback of canceling the waitbar will have a chance to run.

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Jim O'Doherty 2012-10-9

Thanks for the answer - no luck with the drawnow() command unfortunately. I think the issue is that when I actually press the cancel button, it doesn't change the "Canceling" variable to 1, and hence the callback doesn't run.

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Answer 2

Alexander Kosenkov 2016-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/49978-problem-with-waitbar-cancel-button#answer_223854

The currently running function must be started from a button/menu, where Interruptible is set to 'on'. Otherwise, currently running calculation (the one that opened the progress bar) can not be interrupted even to set 'Canceling' to 1.