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6.2. Widget Hierarchy

For your reference, here is the class hierarchy tree used to implement widgets. (Deprecated widgets and auxiliary classes have been omitted.)

GObject
 |  
 GtkObject
  +GtkWidget
  | +GtkMisc
  | | +GtkLabel
  | | | `GtkAccelLabel
  | | +GtkArrow
  | | `GtkImage
  | +GtkContainer
  | | +GtkBin
  | | | +GtkAlignment
  | | | +GtkFrame
  | | | | `GtkAspectFrame
  | | | +GtkButton
  | | | | +GtkToggleButton
  | | | | | `GtkCheckButton
  | | | | |   `GtkRadioButton
  | | | | `GtkOptionMenu
  | | | +GtkItem
  | | | | +GtkMenuItem
  | | | |   +GtkCheckMenuItem
  | | | |   | `GtkRadioMenuItem
  | | | |   +GtkImageMenuItem
  | | | |   +GtkSeparatorMenuItem
  | | | |   `GtkTearoffMenuItem
  | | | +GtkWindow
  | | | | +GtkDialog
  | | | | | +GtkColorSelectionDialog
  | | | | | +GtkFileSelection
  | | | | | +GtkFontSelectionDialog
  | | | | | +GtkInputDialog
  | | | | | `GtkMessageDialog
  | | | | `GtkPlug
  | | | +GtkEventBox
  | | | +GtkHandleBox
  | | | +GtkScrolledWindow
  | | | `GtkViewport
  | | +GtkBox
  | | | +GtkButtonBox
  | | | | +GtkHButtonBox
  | | | | `GtkVButtonBox
  | | | +GtkVBox
  | | | | +GtkColorSelection
  | | | | +GtkFontSelection
  | | | | `GtkGammaCurve
  | | | `GtkHBox
  | | |   +GtkCombo
  | | |   `GtkStatusbar
  | | +GtkFixed
  | | +GtkPaned
  | | | +GtkHPaned
  | | | `GtkVPaned
  | | +GtkLayout
  | | +GtkMenuShell
  | | | +GtkMenuBar
  | | | `GtkMenu
  | | +GtkNotebook
  | | +GtkSocket
  | | +GtkTable
  | | +GtkTextView
  | | +GtkToolbar
  | | `GtkTreeView
  | +GtkCalendar
  | +GtkDrawingArea
  | | `GtkCurve
  | +GtkEditable
  | | +GtkEntry
  | |   `GtkSpinButton
  | +GtkRuler
  | | +GtkHRuler
  | | `GtkVRuler
  | +GtkRange
  | | +GtkScale
  | | | +GtkHScale
  | | | `GtkVScale
  | | `GtkScrollbar
  | |   +GtkHScrollbar
  | |   `GtkVScrollbar
  | +GtkSeparator
  | | +GtkHSeparator
  | | `GtkVSeparator
  | +GtkInvisible
  | +GtkPreview
  | `GtkProgressBar
  +GtkAdjustment
  +GtkCellRenderer
  | +GtkCellRendererPixbuf
  | +GtkCellRendererText
  | +GtkCellRendererToggle
  +GtkItemFactory
  +GtkTooltips
  `GtkTreeViewColumn