How can I change spinners step size?

I am developing a MATLAB GUI using app designer andI am trying to make an app which includes Button Group and Spinner. What I want to do is that when specific button is chosen it changes step size but when I change to another button it would still hold previous value and add new values to that. My function looks like this.

properties (Access = public)

X = 0;

Y = 0;

Z = 0;

end

% Value changed function: Spinner

function SpinnerValueChanged(app, event)

if app.mVButton.Value == 1

app.Spinner.Step = 0.001;

app.X = app.Spinner.Value;

app.Spinner.Value = app.X + app.Y + app.Z;

elseif app.mVButton_2.Value == 1

app.Spinner.Step = 0.01;

app.Y = app.Spinner.Value;

app.Spinner.Value = app.X + app.Y + app.Z;

else

app.Spinner.Step = 0.1;

app.Z = app.Spinner.Value;

app.Spinner.Value = app.X + app.Y + app.Z;

end

end

end

Many thanks in advance.

Answer 1

[Justus Kleine]

I managed to solve the issue. Here is the code for it.

% Value changed function: Spinner
        function SpinnerValueChanged(app, event)
              previousValue = event.PreviousValue;          
              app.Spinner.Value = (app.Spinner.Value + (app.Spinner.Value - previousValue));
              value = app.Spinner.Value;
            if value > 0
               app.Spinner.Value = -2;
            elseif value < -2
               app.Spinner.Value = -0;
            end                      
        end

        % Value changing function: Spinner
        function SpinnerValueChanging(app, event)
            changingValue = event.Value;
            if changingValue > 0
                app.Spinner.Value = -2;
            elseif  changingValue < -2
                app.Spinner.Value = 0; 
            end        
        end

        % Selection changed function: ButtonGroup
        function ButtonGroupSelectionChanged(app, event)
           if app.mVButton.Value == 1
              app.Spinner.Step = 0.0005; %needed to divide by 2
           elseif app.mVButton_2.Value == 1
              app.Spinner.Step = 0.005; %needed to divide by 2
           else            
              app.Spinner.Step = 0.05; %needed to divide by 2
           end            
        end
        end

[Nima Abbasi]

Thank you Justus. Btw, it's just-us in this mathworks thread.