- Event sender.
- Event arguments.
The TreeView.TestCollapseRow event utilizes this delegate:
Event data is passed via the Gtk.TestCollapseRowArgs parameter.
To attach a Gtk.TestCollapseRowHandler to an event, add the TestCollapseRowHandler instance to the event. The methods referenced by the TestCollapseRowHandler instance are invoked whenever the event is raised, until the TestCollapseRowHandler is removed from the event.