The #GtkBin widget is a container with just one child.
It is not very useful itself, but it is useful for deriving subclasses,
since it provides common code needed for handling a single child widget.
Many GTK+ widgets are subclasses of #GtkBin, including #GtkWindow,
#GtkButton, #GtkFrame, #GtkHandleBox or #GtkScrolledWindow.
The #GtkBin widget is a container with just one child. It is not very useful itself, but it is useful for deriving subclasses, since it provides common code needed for handling a single child widget.
Many GTK+ widgets are subclasses of #GtkBin, including #GtkWindow, #GtkButton, #GtkFrame, #GtkHandleBox or #GtkScrolledWindow.