Getting GUI Slider updates while dragging
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Norton Allen
el 23 de Oct. de 2012
Respondida: AG
el 20 de Feb. de 2019
Is there a straightforward method to get updates on a slider's position while it is being dragged? The standard callback gets called only after the drag is complete and the button has been released.
I'm thinking of using the ButtonDownFcn to start a polling loop checking the slider's value. (Then how do I detect mouse up?)
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Sean de Wolski
el 23 de Oct. de 2012
This can be done easily with addlistener
h = uicontrol('style','slider','callback',@(src,evt)disp(get(src,'value')));
addlistener(h,'Value','PreSet',@(~,~)disp('hi'));
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Mohamad Roslan Mohd Roshdi
el 24 de En. de 2016
Hi How to get the slider update value into variable?
Stephen23
el 24 de En. de 2016
Mohamad Roslan Mohd Roshdi also created a question here: http://www.mathworks.com/matlabcentral/answers/264979-continuous-slider-callback-how-to-get-value-from-addlistener
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AG
el 20 de Feb. de 2019
The following worked for me. I get a 'live' scroll-bar update by calling this within another function:
slider_value = get(gcf.Children(j), 'Value');
...where j is the value of the UIcontrol corresponding to the scroll. You can find out which UIControl it is in the figure by putting a break in the code and using:
gcf.Children
This could also be ascertained in run-time using:
for j = 1:length(gcf.Children)
get(gcf.Children(j), 'Tag')
end
which will return a char array with the Tag of each of the children which could then be compared using strcmp(), for example. I've done this using a GUI created with GUIDE.
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