Listener not responding to ui slider

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Sebastian
Sebastian 2025-3-20
回答： Image Analyst 2025-3-21
I didn't like how the normal callback implementation on the slider only updated once I stop dragging it, so I tried addlistener instead, but for some reason it just doesn't respond at all. As a simple example, for the following code
sld = uicontrol('Style','slider');
lst = addlistener(sld,'Value','PostSet',@(src,evt)disp('value changed'));
Changing the value of the slider directly from the Command Window ( sld.Value=0.5; ) causes the callback function to run, but moving the slider or pressing the arrows on its ends does nothing.
What am I doing wrong?
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Sebastian
Sebastian 2025-3-20
@Les Beckham, I'm on R2024b. I'm also running on LinuxMint if that helps at all - I've had a couple specific and weird issues in the past that I'm pretty sure were Linux-specific.
Les Beckham
Les Beckham 2025-3-20
Ah yes, that could be a difference as well. I'm on Windows 10. I'll report the issue with 2025a. Sorry to not have any more ideas to help you.

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回答（1 个）

Image Analyst
Image Analyst 2025-3-21
If you use AppDesigner then you can use the "Value changing" event to do an instantaneous/live updating of the displayed value. For example, here is an example from one of my programs:
% Value changing function: sldOpacity
function sldOpacityValueChanging(app, event)
changingValue = event.Value;
tt = sprintf('%.1f %% original and %.1f %% colorized', changingValue, 100-changingValue);
app.lblOpacity.Text = tt; % Change static text label above the slider.
app.lblOpacity.Tooltip = tt;
end

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