App Design: stop

I have a "play" button attached to the "ButtonPlayPushed" callback which plots a dynamic graph (with the function imagesc()).

How can I program a stop button that stops the action of the "play" button?

Answer 1

[Mario Malic]

Actually,

In callback for the stop button, set app.stopFlag = true;

Within the plotting function check the property

% You're probably plotting with for loop or something similar,
% so include this into it
if app.stopFlag % assuming app.stopFlag=true means process should abort
    return
end

Read this as well.

Credits out to Adam's answer from my similar question

You can use a callback function to change the value of a flag that is checked repeatedly within the plotting commands.

Define the flag as a public property of the app (see instructions) so the external function has access to the flag.

The app's startup function would set the flag to false: app.stopFlag = false;

The callback function would merely set the flag to true: app.stopFlag = true;

Within the external (or internal) function, you can use the condition,

if app.stopFlag   % assuming app.stopFlag=true means process should abort
    return
end

Note that if you return before the function is complete, you'll need to assign default output values and you may need to add return commands to any other invoking functions.

Then, the flag should be reset: app.stopFlag=false.

[Palma Errico]

Thanks Mario the code is good.

The only thing, when stopFlag = true I don't want the window to close but only to stop the plot (and save the data I know how to do) is it possible to do it?

[Mario Malic]

I am not sure how exactly should be done as it may depend on the plot code. Try with break instead of return, as break exits for or while loop, whereas return exits the function (if your plot was located in a function, then it would be working properly I think).

[Palma Errico]

thanks Mario it was just what i wanted.

With the right changes the app works with break

[Mario Malic]

Great to hear!