cancelling waitbar insdie a gui function
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Hello everyone, I am having some problem with waitbar defined inside a gui script. The problem is I have created a waitbar with cancel option which was working fine outside. But when I pasted it inside my gui.m script the cancel button is not working (rest all is fine). Below is the code I have used:
pvh=waitbar(0,'calculating.....','name','ESTIMATION',...
'createcancelbtn','setappdata(pvh,''cancel_callback'',1)');
setappdata(pvh,'cancel_callback',0);
for count_i1 = 1:l_count
if getappdata(pvh,'cancel_callback')==1
errordlg('Stopped by user');
break;
end
waitbar(count_i1/ l_count,pvh,sprintf('Calculating %d %s %d',count_i1,'of', l_count))
I went through some help of MATLAB and tried some options like drawnow or updating the handles of the waitbar figure. Looks like I did not do it properly. Any suggestions on how to make it work? thanks in advance.
采纳的回答
You cannot access the handle pvh from the callback, when it is defined as a string. Callbacks defines as a string are evaluated in the baseworkspace, where "phv" is not known. I'd expect an error message then.
Unfortunately the documentation of waitbar mentions a string-callback only. Using a function handle would be smarter. Try this:
pvh = waitbar(0, 'calculating.....', 'name', 'ESTIMATION',...
'createcancelbtn', @myCancelCB);
setappdata(pvh, 'cancel_callback', 0);
for count_i1 = 1:l_count
drawnow;
if getappdata(pvh, 'cancel_callback') == 1
errordlg('Stopped by user');
break; % Stop the loop: for coubnt_i1
end
...
end
function myCancelCB(hObject, EventData)
phv = ancestor(hObject, 'figure');
setappdata(phv, 'cancel_callback', 1);
end
This is somewhat longer than defining the callback as string, but much safer, because it does not pollute the baseworkspace.
2 个评论
Shravan Kumar
2017-4-20
Jan
2017-4-20
The trailing "end" is required, if any function of the M-file has one or if it is a nested function. In other cases it should be omitted.
I do not understand exactly what "inside gui" means. The show code works in a script also, but in older Matlab versions you have to define the function for the callback in a separate file.
Where did you "update the handles"?
The general suggestions are:
- Functions are more stable than scripts, so use scripts for short hacks only, while functions are preferred for productive work.
- Define callbacks by function handles, because the evaluation of strings is prone to bugs and hard to debug.
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