QTreeView/Model drop action - no expand sign ?

[Dariusz]

Hey

I'm lost :- ), I started with QAbstractItemModel and QTreeView, subclassed what I needed, when I drop item on another item the expand signal does not appear. I have to expand all/hide all to force it to update the icon drawing...

I call beginInsertRows()/end as well as Q_EMIT(itemFirst.index(),itemLast.index()) when finishing dropMimeData to notify views of data change but I still have no ">" when I finish the drop...

What should I do ?

Edit it seems that even if I add items to invisibleRoot they don't display either until I force refresh somehow...

Regards
Dariusz
TIA

[raven-worx]

@Dariusz said in QTreeView/Model drop action - no expand sign ?:

call beginInsertRows()/end as well as Q_EMIT(itemFirst.index(),itemLast.index()) when finishing dropMimeData to notify views of data change but I still have no ">" when I finish the drop...
What should I do ?

to the expand icon appear either QAbstractItemModel::canFetchMore() returns true or QAbstractItemModel::rowCount() a value bigger 0 for the parent index.
Also did you emit the dataChanged() signal on the parent index?

[Dariusz]

@raven-worx said in QTreeView/Model drop action - no expand sign ?:

Also did you emit the dataChanged() signal on the parent index?

I've just read the post. I forgot to correct it. This is what I edit:

bool testModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) {
     ...
     Q_EMIT dataChanged(itemFirst.index(),itemLast.index()) 
}

Hmmmm so I tried this, the parent is the object that is in function above.

    Q_EMIT dataChanged(parent, parent)

Now this now "magically" works, I get extra ">" when I drop item on another item...
I also learned that I also need to call Q_EMIT layoutChanged({parent}/flag) to update view if I drop items on expanded parent...

Ok all good then, thanks! Weird issue o.o