Parameter Tree: cancel change

[Yannick Willener]

Hello

I'm trying to cancel a value change in a parameter tree. 

The user enters a value, then the value is checked if supported depending on other values. 

If not I would like to display a warning to the user and cancel the change (reverting to the initial value). 

I have tried to use the sigTreeStateChanged signal to handle that, but with no success.

What is the correct method to implement it?

Thanks

Yannick

[Patrick]

Hi,

I guess you'd connect to the sigValueChanged or sigValueChanging signal for the Parameter you'd like to check. Or maybe both, since on the first sigValueChanging you might want to do a saveState or save the value(), so you can restoreState on sigValueChanged if the value is invalid.

Patrick