QtWidgets.QScrollBar action is int not SliderAction enum

[Phil Thompson]

On 05/07/2022 10:54, Barry Scott wrote:
> I have code like this:
> 
> class BemacsVerticalScrollBar(QtWidgets.QScrollBar, 
> be_debug.EmacsDebugMixin):
>     def __init__( self, panel ):
>         super().__init__( QtCore.Qt.Orientation.Vertical, panel )
> 
>         self.actionTriggered.connect( self.handleActionTriggered )
> 
>     def handleActionTriggered( self, action ):
>         # action is an int - convert to its enum
>         action = self.SliderAction( action )
>         # now can compare to the enum values
>         if action == self.SliderAction.SliderSingleStepAdd:
> 
> The action param is an int and not one of the enum values from 
> SliderAction.
> Is this intended?

Yes. There are a number of cases that Qt uses int as a signal argument 
when the value is always an enum member. There are other cases where the 
signature (IMHO correctly) specifies an enum.

I agree that the behaviour is surprising but I prefer not to try and 
"fix" the Qt API. Other people have taken the approach of reporting it 
as a Qt bug, but I don't know if this has been successful.

Note that you can simplify your code by comparing your original 'action' 
with the enum member's 'value' attribute.

Phil