signal callback delegate or function to connect
void callback(uint position, uint nItems, gtk.section_model.SectionModel sectionModel)
position The first item that may have changed (optional)
nItems number of items with changes (optional)
sectionModel the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to SectionsChanged signal.
Emitted when the start-of-section state of some of the items in model changes.
Note that this signal does not specify the new section state of the items, they need to be queried manually. It is also not necessary for a model to change the section state of any of the items in the section model, though it would be rather useless to emit such a signal.
The signalGio.ListModel::items-changed implies the effect of the signalGtk.SectionModel::sections-changed signal for all the items it covers.