How to interrupt the callback function in GUI?

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.

[Jan]

It would be much easier to answer, if you post your current code. Otherwise the readers have to guess all details, e.g. of you are using GUIDE, AppDesigner or create the GUI programmatically.

It is not clear, if the callback contains some loops. or if a huge data set is processed, etc.

[Jean cheung]

function debugGUI
clear;% clear variable
clc;
close all
format compact;% display format style is compact
global SimStep;
% global run;%used in callback function to stop it.
%% Create a GUI
GUI = uifigure('Name','Traffic Simulation');
GUI.Position(3:4) = [800 600];
GUI.WindowState = 'normal';
GUI.Color = [1,1,1];
GUI.CloseRequestFcn = @(GUI, event)my_closereq(GUI);
%% Sim Panel: Simulation Parameter
SimStep = 3600;
pnlCtrl=uipanel(GUI);
pnlCtrl.Position = [650 410 140 180];
pnlCtrl.BackgroundColor = [1,1,1];

lblCtrl = uilabel(pnlCtrl);
lblCtrl.Position = [10 155 120 30];
lblCtrl.HorizontalAlignment = 'center';
lblCtrl.FontWeight = 'bold';
lblCtrl.Text = 'Simulation Control';

bgSimCtrl = uibuttongroup(pnlCtrl);
bgSimCtrl.Position = [10 10 120 80];
bgSimCtrl.BackgroundColor = [1,1,1];
bgSimCtrl.BorderType = 'none';
bgSimCtrl.Interruptible = 'on';
bgSimCtrl.SelectionChangedFcn = @bgSimCtrl_SelectChanged;

btnStart = uitogglebutton(bgSimCtrl);
btnStart.Position = [30 55 60 20];
btnStart.Text = 'Start';

btnPause = uitogglebutton(bgSimCtrl);
btnPause.Position = [30 30 60 20];
btnPause.Text = 'Pause';
btnPause.Value = 1;

btnStop = uitogglebutton(bgSimCtrl);
btnStop.Position = [30 5 60 20];
btnStop.Text = 'Stop';
%% callback
    function my_closereq(GUI)
        selection = questdlg('Close the window?',...
            'Confirmation',...
            'Yes','No','Yes');
        switch selection
            case 'Yes'
                delete(GUI)
            case 'No'
                return
        end
    end
    function bgSimCtrl_SelectChanged(hObject,eventdata,handles)
        mode = eventdata.NewValue.Text;
        switch mode
            case 'Start'
                for time = 1:SimStep
                    pause(1);
                    disp(num2str(time));
                end%time
            case 'Pause'
                disp('Pause');
            case 'Stop'
                disp('Stop');
        end%switch
    end%bgSimCtrl_SelectChanged
end