How To Expand Top-level Qtreeview Items

I do not understand why this does not seem to expand the top-level root items in a QTreeView: # clear existing treeview data model = self.treeview.model().sourceModel() model.clear

Solution 1:

If you're using a proxy model, you must use the indexes it provides, rather than the ones from the source model. So either do this:

proxy = self.treeview.model()

for row inrange(proxy.rowCount()):
    index = proxy.index(row, 0)
    self.treeview.expand(index)

or this:

proxy = self.treeview.model()
model = proxy.sourceModel()    

for row inrange(model.rowCount()):
    index = model.index(row, 0)
    self.treeview.expand(proxy.mapFromSource(index))