What is the difference between valuechangedfcn and valuechangingfcn?

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Ranjan Sonalkar
Ranjan Sonalkar on 7 Jun 2022
Commented: Lwando Mlindini on 1 Aug 2022 at 21:05
Some data entry window functions have the option to select a callback with options "valuechangedfcn" and "valuechangingfcn". I have used the valuechangedfcn callback to do something after the GUI user changes the value in that field. But, I don't know what valuechangingfcn is used for. Is that for doing something when a user clicks within the field and has not yet finished entering the new value, and the GUI would do something during that time? What would be an example?... Maybe pause an execution that is underway?

Accepted Answer

Kevin Holly
Kevin Holly on 7 Jun 2022
Let's say it is a slider. "valuechangedfcn" would occur after you finished dragging the slider and let go on a new value. "valuechangingfcn" would occur while you are dragging the slider.
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More Answers (1)

Matt J
Matt J on 7 Jun 2022
Edited: Matt J on 7 Jun 2022
Is that for doing something when a user clicks within the field and has not yet finished entering the new value, and the GUI would do something during that time? What would be an example?
Suppose you wanted to implement some sort of autocomplete feature. As the user types characters into an edit-text field, its valuechangingfcn can have a different edit box display suggested completions.
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