Widget Hierarchy

The following tree is the class hierarchy of Ruby/GTK. In Ruby/GTK, the class hierarchy of Ruby is very similar to the class hierarchy of GTK.

 Gtk::Object
  +Gtk::Widget
  | +Gtk::Misc
  | | +Gtk::Label
  | | | +Gtk::AccelLabel
  | | | `Gtk::TipsQuery
  | | +Gtk::Arrow
  | | +Gtk::Image
  | | `Gtk::Pixmap
  | +Gtk::Container
  | | +Gtk::Bin
  | | | +Gtk::Alignment
  | | | +Gtk::Frame
  | | | | `Gtk::AspectFrame
  | | | +Gtk::Button
  | | | | +Gtk::ToggleButton
  | | | | | `Gtk::CheckButton
  | | | | |   `Gtk::RadioButton
  | | | | `Gtk::OptionMenu
  | | | +Gtk::Item
  | | | | +Gtk::MenuItem
  | | | | | +Gtk::CheckMenuItem
  | | | | | | `Gtk::RadioMenuItem
  | | | | | `Gtk::TearoffMenuItem
  | | | | +Gtk::ListItem
  | | | | `Gtk::TreeItem
  | | | +Gtk::Window
  | | | | +Gtk::ColorSelectionDialog
  | | | | +Gtk::Dialog
  | | | | | `Gtk::InputDialog
  | | | | +Gtk::DrawWindow
  | | | | +Gtk::FileSelection
  | | | | +Gtk::FontSelectionDialog
  | | | | `Gtk::Plug
  | | | +Gtk::EventBox
  | | | +Gtk::HandleBox
  | | | +Gtk::ScrolledWindow
  | | | `Gtk::Viewport
  | | +Gtk::Box
  | | | +Gtk::ButtonBox
  | | | | +Gtk::HButtonBox
  | | | | `Gtk::VButtonBox
  | | | +Gtk::VBox
  | | | | +Gtk::ColorSelection
  | | | | `Gtk::GammaCurve
  | | | `Gtk::HBox
  | | |   +Gtk::Combo
  | | |   `Gtk::Statusbar
  | | +Gtk::CList
  | | | `Gtk::CTree
  | | +Gtk::Fixed
  | | +Gtk::Notebook
  | | | `Gtk::FontSelection
  | | +Gtk::Paned
  | | | +Gtk::HPaned
  | | | `Gtk::VPaned
  | | +Gtk::Layout
  | | +Gtk::List
  | | +Gtk::MenuShell
  | | | +Gtk::MenuBar
  | | | `Gtk::Menu
  | | +Gtk::Packer
  | | +Gtk::Socket
  | | +Gtk::Table
  | | +Gtk::Toolbar
  | | `Gtk::Tree
  | +Gtk::Calendar
  | +Gtk::DrawingArea
  | | `Gtk::Curve
  | +Gtk::Editable
  | | +Gtk::Entry
  | | | `Gtk::SpinButton
  | | `Gtk::Text
  | +Gtk::Ruler
  | | +Gtk::HRuler
  | | `Gtk::VRuler
  | +Gtk::Range
  | | +Gtk::Scale
  | | | +Gtk::HScale
  | | | `Gtk::VScale
  | | `Gtk::Scrollbar
  | |   +Gtk::HScrollbar
  | |   `Gtk::VScrollbar
  | +Gtk::Separator
  | | +Gtk::HSeparator
  | | `Gtk::VSeparator
  | +Gtk::Preview
  | `Gtk::Progress
  |   `Gtk::ProgressBar
  +Gtk::Data
    +Gtk::Adjustment
    `Gtk::Tooltips

class Gtk::Widget is the top in the widget classes of Ruby/GTK. In this class, basic attributes and behavior of all widgets in GTK are defined. Gtk::Widget is the super-class of the other widget class and not able to be instanciated.

Gtk::Container is a widget to place other widgets into it. Box, Flame, Button widgets are kinds of Container. Gtk::Container is an abstract class and not able to be instanciated.

The following widgets don't have corresponding windows.

Gtk::Alignment
Gtk::Arrow
Gtk::Bin
Gtk::Box
Gtk::Image
Gtk::Item
Gtk::Label
Gtk::Pixmap
Gtk::ScrolledWindow
Gtk::Separator
Gtk::Table
Gtk::AspectFrame
Gtk::Frame
Gtk::VBox
Gtk::HBox
Gtk::VSeparator
Gtk::HSeparator