layoutChanged()

[magland]

I've subclassed QAbstractItemModel. Internally I remove some rows from the model, so I use

emit layoutAboutToBeChanged();
... delete my rows ...
emit layoutChanged();

emit layoutAboutToBeChanged();
... delete my rows ...
emit layoutChanged();

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Everything works fine, except sometimes where apparently the QTreeView tries to access one of the internal pointers I have already deleted - then I get a seg fault. I know this is the issue because if I remove the rows but don't delete the internal data, then everything is fine (except for a memory leak of course). It doesn't happen all the time... only when I have recently selected a child of the row I am to delete.

So my question is.... what do I need to do to notify the QTreeView that rows have been removed and internal data has been deleted.

Thanks

[magland]

Based on a hint in Qt docs, I solved the problem... when data is deleted you apparently must clear the associated persistent indexes using

changePersistentIndex(index,QModelIndex()).

changePersistentIndex(index,QModelIndex()).

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So, is this true then whenever you delete data in your QAbstractItemModel, you also need to manually clear the persistent indexes?