How to interrupt the callback function in GUI?
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In GUI programming, function btn_callback is the callback of uibuttongroup (a group of button A,B and C).
Abilities of A,B and C are start, pause and stop this function, and all of them are in the same callback.
Function btn_callback will run when click button A, but this function will pause and stop when button B and button C is clicked respectively.
When button B was clicked, the function will run from the moment that it paused if button A clicked again.
But when button C was clicked, the function will run from the beginning if button A clicked again.