Qt model/view framework selection system - store/restore selections

[Dariusz]

Hey

I'm trying to wrap my head around selections in qt. I'd like to store my selection & perform some action(like renaming selected items) and then restore it.

I know I can get selectedIndexes(), but how can I get QItemSelection/QItemSelectionRange object instead? Or how can I convert my selectedIndexes() to QItemSelection/Range ?

I have 20k items and selecting them/reselecting takes quite a bit of time.

Say if I try to re-select items from selectedIndexes()

auto selectedItems = selectedIndexes();
for(auto&itm:selectedItems ){
     do stuff
     selectionModel()->select(itm, QItemSelectionModel::Select | QItemSelectionModel::Rows);
     }

This can take minutes... from debug that function is marked as 90% time

I also tried using this:

...
QItemSelection sel = selectionModel()->selection();
for(auto&itm:selectedIndexes()){
     do stuff
     }
selectionModel()->select(sel,QItemSelectionModel::Select | QItemSelectionModel::Rows);
...

But this did not do anything. It does not re-select the items.
I run my selection function after QTreeView::mouseReleaseEvent(event);
Where am I hitting the wall here?

[Dariusz]

@Dariusz I'm a nob. I captured selection range after action and not before. Storing selection before calling QTreeView::mouseReleaseEvent(event); seems to have solved the issue.