QTreeView with QAbstractItemModel

[Fletcher]

I am using layoutAboutToBeChanged().

Here's what I'm doing. It's PyQt. I have a tree made of TreeItem()s (my node class)

# in subclass of QAbstractItemModel
    def recreateTree(self):
        self.emit(QtCore.SIGNAL('layoutAboutToBeChanged()'))
        self.root = TreeItem(None)
        # omitted code to generate the other nodes and add them to root
        self.emit(QtCore.SIGNAL('layoutChanged()'))

# in subclass of QAbstractItemModel
    def recreateTree(self):
        self.emit(QtCore.SIGNAL('layoutAboutToBeChanged()'))
        self.root = TreeItem(None)
        # omitted code to generate the other nodes and add them to root
        self.emit(QtCore.SIGNAL('layoutChanged()'))

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When I reassign self.root, Python automatically deletes the old tree (or should) since there's no other reference to it.

[Fletcher]

After looking through the API a bit more I've changed my function a bit and it *seems to be working*. I really hate this feeling though, where I do not really understand what the API is doing behind my back.

# in subclass of QAbstractItemModel
    def recreateTree(self):
        self.root = TreeItem(None)
        # [omitted code to generate the other nodes and add them to root]
        self.reset() # default implementation. I don't really know what it does

# in subclass of QAbstractItemModel
    def recreateTree(self):
        self.root = TreeItem(None)
        # [omitted code to generate the other nodes and add them to root]
        self.reset() # default implementation. I don't really know what it does

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