public signal void item_activated (TreePath path)
The item_activated signal is emitted when the method
gtk_icon_view_item_activated is called, when the
user double clicks an item with the "activate-on-single-click" property set to false, or when the user single
clicks an item when the "activate-on-single-click" property set to true.
It is also emitted when a non-editable item is selected and one of the keys: Space, Return or Enter is pressed.
the `GtkTreePath` for the activated item