Sets our main struct and passes it to the parent class.
Allocates a new GtkRequisition.
Copies a GtkRequisition.
Frees a GtkRequisition.
Get the main Gtk struct
the main Gtk struct as a void*
the widget’s desired height
the widget’s desired width
the main Gtk struct
A GtkRequisition represents the desired size of a widget. See GtkWidget’s geometry management section for more information.