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GObject ╰── GInitiallyUnowned ╰── GtkWidget ╰── GtkContainer ╰── GtkBin ├── GtkWindow ├── GtkActionBar ├── GtkAlignment ├── GtkComboBox ├── GtkFrame ├── GtkButton ├── GtkMenuItem ├── GtkEventBox ├── GtkExpander ├── GtkFlowBoxChild ├── GtkHandleBox ├── GtkListBoxRow ├── GtkToolItem ├── GtkOverlay ├── GtkScrolledWindow ├── GtkPopover ├── GtkRevealer ├── GtkSearchBar ├── GtkStackSidebar ╰── GtkViewport
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.