ListBoxUpdateHeaderFunc

Description:

[ CCode ( instance_pos = 2.9 ) ]
public delegate void ListBoxUpdateHeaderFunc (ListBoxRow row, ListBoxRow? before)

Whenever row changes or which row is before row changes this is called, which lets you update the header on row .

You may remove or set a new one via [method@Gtk.ListBoxRow.set_header] or just change the state of the current header widget.

Parameters:

row

the row to update
before

the row before row, or null if it is first
user_data

user data

Namespace: Gtk
Package: gtk4