Hi,

So you want the sigTreeStateChanged signal to only be fired once when 
calling the checkAllBools/unCheckAllBools methods? In that case, you could 
do something like 

    def checkAllBools(self):
        p.blockSignals(True)
        for plt in self.pSelectBoolItems.groupItems1:
            plt.setValue(True)
        for plt in self.pSelectBoolItems.groupItems2:
            plt.setValue(True)
        for plt in self.pSelectBoolItems.groupItems3:
            plt.setValue(True)
        p.blockSignals(False)
        changes()

Basically, suppress the triggering of the signals during the method, then 
call changes() manually.

Patrick

On Monday, 20 May 2019 23:34:32 UTC+9:30, b. bb wrote:
>
> Hi,
> I'm writing a program to calculate and display a large number of curves. 
> These are structured in several groups of the same type. Now I like to 
> select each curve separately or pressing one button for showing all 
> respectively another button to hide all curves. How can it be done that the 
> function 'changes()' is called only once?
>
> Thanks,
> Ben
>

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