How to use the same button to begin and end a callback

Hello,

I have the following code:

 Traj_Button = uicontrol('Style','pushbutton', 'String','Start', 'Units', 'normalized', 'Position',[0.8,0.7,0.15,0.05], 'Callback',{@Traj_Button_Callback});
function Traj_Button_Callback(source,eventdata)

        if strcmp(source.String, 'Start')
            source.String = 'Start';
            while % Button not pushed
                % code
            end
        else
            source.String = 'End';
        end

I would like to use the same pushbutton to start my callback function, and wait to en end it that user pushes the button again.

[Stephen23]

Have a look at the 'Demo' button of my FEX submission CubeHelix, it uses a toggle button to control a loop. You could do something similar with a push button.

https://www.mathworks.com/matlabcentral/fileexchange/43700-cubehelix-colormaps--beautiful--distinct--versatile-

[Sébastien Marlio-Marette]

Thank you for your help, it works fine.