Restrict what can be dragged from a QTreeView

[JonB]

I really will keep this one brief! :)

Code has a QTreeView. It allows dragging of elements out to a QGraphicsView. I didn't write any of the code for this, haven't done drag & drop. There's no MIME stuff, no code I can see in the treeview side, no creation of drag objects, just:

self.treeView_blklib.setDragEnabled(True)
self.treeView_blklib.setDragDropOverwriteMode(True)
self.treeView_blklib.setDragDropMode(QtWidgets.QAbstractItemView.DragOnly)

so I guess that all works internally.

All I want to know is: I want to restrict so that the tree leaves can still be dragged but the nodes cannot. How simply can that be achieved? Do I have to perhaps introduce a mouse-down handler and do something there?

[Christian Ehrlicher]

Overwrite QAbstractItemModel::flags()

[JonB]

@Christian-Ehrlicher
I wondered whether there might be a flag for dragable on my way home after I posted! I see https://doc.qt.io/qt-5/qt.html#ItemFlag-enum, Qt::ItemIsDragEnabled 4 It can be dragged.. Perfecto-mundo, thank you :)