Reset Slider to zero

I want a way of setting the value of a slider to zero when it is ctrl + clicked.

Is there a way of picking up the ctrl press in the slider_changed event?

Answer 1

[Umar]

Hi Daniel,

To achieve the desired functionality of setting the slider value to zero when it is ctrl + clicked, you can utilize MATLAB's built-in event handling capabilities. Unfortunately, MATLAB does not directly provide a way to detect the ctrl key press within the slider_changed event, so you have to work around this limitation by combining the slider callback with a mouse click event listener to achieve the desired behavior. I will illustrate with MATLAB script example that will demonstrate how to implement this functionality:

function sliderCtrlClickExample

    % Create a figure and a slider

    fig = figure;

    sld = uislider(fig,'Position',[100,100,120,3],'ValueChangedFcn',@sliderCallback);

    % Add a mouse click event listener to the figure

    set(fig, 'WindowButtonDownFcn', @mouseClickCallback);

    function sliderCallback(src, ~)
        disp(['Slider value changed: ' num2str(src.Value)]);
    end

    function mouseClickCallback(~, event)
        if isequal(event.Modifier, {'control'})
            disp('Ctrl + Click detected');
            sld.Value = 0; % Set slider value to zero
        end
    end
end

So, I created a figure and a slider using the uislider function.Then, set the ValueChangedFcn property of the slider to a callback function sliderCallback that will be triggered when the slider value changes.Afterwards, add a mouse click event listener to the figure using the WindowButtonDownFcn property. So, the callback function mouseClickCallback checks if the ctrl key is pressed during a mouse click event. If the ctrl key is pressed, it sets the slider value to zero.

So, now you can understand that by combining the slider callback with a mouse click event listener, you can effectively detect the ctrl key press and set the slider value to zero accordingly. Hope this will help you get started with your project.

[Daniel]

Awesome, thanks

[Umar]

No problem Daniel, glad it helped resolved your problem.