How to tell a QAbstractItemModel that data has been inserted or removed? (4.8)

[anda_skoa]

Thanks. I did see that but was still uncertain: The documentation is worded in a way that makes it appear that beginInsertRow/endInsertRow should be called when the *model* is causing the row insertion

Whenever rows are inserted, independend on whether they are insterted through the model's API, e.g. by a view, or by the model itself.

The other thing that confused me about those is: Does that mean I need to add the ability to my underlying data class to emit signals or otherwise notify the list model *before* data is changed as well as after, so that I can call beginInsertRow and endInsertRow before and after the data changes? Or can I just call begin+end together after the data changes... ?

I think you can do that.

Usually, when I am dealing with an uncooperative data source, I'll try to make the model still behave like it would with a cooperative data base by making sure rowCount() and data() work with the old row indexes until after beginInsertRows() returns.

But I think the standard views only use the about signal to avoid updating until the end of the change.

Cheers,
_