Sets the GtkWidgetClass.activate_signal field with the signal id for the given @signal_name.
The signal will be emitted when calling [method@Gtk.Widget.activate].
The @signal_name of @widget_type must have been registered with g_signal_new() or g_signal_newv() before calling this function.
the name of the activate signal of @widget_type
See Implementation
Sets the GtkWidgetClass.activate_signal field with the signal id for the given @signal_name.
The signal will be emitted when calling [method@Gtk.Widget.activate].
The @signal_name of @widget_type must have been registered with g_signal_new() or g_signal_newv() before calling this function.