[PySide] calling item.setData multiple times from inside QItemDelegate.setModelData

[Frank Rueter | OHUfx]

Hi all,

I'm using a QStandardItemModel with QItemDelegate for a custom view 
where I need to set multiple values for one item when the editor closes.

I had these lines in my delegate's setModelData() method:
         item.setData(editor.player.isMirroredX , EL.MirrorXRole)
         item.setData(editor.player.isMirroredY , EL.MirrorYRole)
         item.setData(editor.player.currentFrameNumber() , 
EL.CurrentFrameRole)


This led to inconsistent and unpredictable results though, e.g. often 
times the editor.player.currentFrameNumber() was not saved, or it was 
only saved when one of the other values changed as well.

I had a hunch that the repeated emission of dataChanged was teh culprit, 
so  blocked the model's signals before running the above three lines, 
then re-enabled the signals and manually emitted model.dataChanged once:

         # temporarily block model signals to prevent multiple emissions of
         # the dataChanged signal which causes unpredictable results
         item.model().blockSignals(True)

         # set values for allnecessary roles
         item.setData(editor.player.isMirroredX , EL.MirrorXRole)
         item.setData(editor.player.isMirroredY , EL.MirrorYRole)
         item.setData(editor.player.currentFrameNumber() , 
EL.CurrentFrameRole)

         # re-enable model's signla emissions
         item.model().blockSignals(False)

         # manually emit dataChanged once now that all roles have been 
changed
         item.model().dataChanged.emit(index, index)


This seems somewhat hacky though, right? Is there a better way that 
people would recommend to set the value for multiple roles of the same 
index/item in one go inside the setModelData?

Or is the above legit?

Cheers,
frank

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