|   Implementor |  | 
|    Gtk::Widget | Abstract Widget (Base class for all widgets) | 
|     Gtk::Calendar | Display a calendar and/or allow the user to select a date | 
|     Gtk::CellView | A widget displaying a single row of a TreeModel | 
|     Gtk::Container | Abstract container class | 
|      Gtk::Bin | A container with just one child | 
|       Gtk::Alignment | A widget which controls the alignment and size of its child | 
|       Gtk::Button | A widget that creates a signal when clicked on | 
|        Gtk::ColorButton | A button to launch a color selection dialog | 
|        Gtk::FontButton | A button to launch a font selection dialog | 
|        Gtk::LinkButton | Create buttons bound to a URL | 
|        Gtk::ScaleButton | A button which pops up a scale widget | 
|         Gtk::VolumeButton | A button which pops up a volume control | 
|        Gtk::ToggleButton | A Gtk::ToggleButton will remain 'pressed-in' when clicked | 
|         Gtk::CheckButton | Create widgets with a discrete toggle button | 
|          Gtk::RadioButton | A single radio button performs the same basic function as a Gtk::CheckButton, as its position in the object hierarchy reflects | 
|         Gtk::MenuButton | A widget that shows a menu when clicked on | 
|       Gtk::ComboBox | A widget used to choose from a list of items | 
|        Gtk::AppChooserButton | A button to launch an application chooser dialog | 
|        Gtk::ComboBoxText | This is a simple variant of ComboBox that hides the model-view complexity for simple text-only use cases | 
|       Gtk::EventBox | Event capturing box | 
|       Gtk::Expander | A container which can hide its child | 
|       Gtk::Frame | A Gtk::Bin with a decorative frame and optional label | 
|        Gtk::AspectFrame | A frame that constrains its child to a particular aspect ratio | 
|       Gtk::HandleBox | A widget for detachable window portions | 
|       Gtk::MenuItem | Child item for menus | 
|        Gtk::CheckMenuItem | A menu item that maintains the state of a boolean value in addition to a Gtk::MenuItem's usual role in activating application code | 
|         Gtk::RadioMenuItem | A CheckMenuItem that belongs to a group | 
|        Gtk::ImageMenuItem | A menu item with an icon | 
|        Gtk::SeparatorMenuItem | A separator used to group items within a menu | 
|        Gtk::TearoffMenuItem | A special Gtk::MenuItem which is used to tear off and reattach its menu | 
|       Gtk::ScrolledWindow | Adds scrollbars to its child widget | 
|       Gtk::ToolItem |  | 
|        Gtk::SeparatorToolItem | A toolbar item that separates groups of other toolbar items | 
|        Gtk::ToolButton | A Gtk::ToolItem subclass that displays buttons | 
|         Gtk::MenuToolButton | A Gtk::ToolItem containing a toggle button | 
|         Gtk::ToggleToolButton | A Gtk::ToolItem containing a toggle button | 
|          Gtk::RadioToolButton | A toolbar item that contains a radio button | 
|       Gtk::Viewport | An adapter which makes widgets scrollable | 
|       Gtk::Window | Toplevel Window This represents all widgets which are physical windows controlled by the window manager | 
|        Gtk::ApplicationWindow | A Gtk::Window subclass with Gtk::Application support | 
|        Gtk::Assistant | A widget used to guide users through multi-step operations | 
|        Gtk::Dialog | Create popup windows | 
|         Gtk::AboutDialog | The AboutDialog offers a simple way to display information about a program like its logo, name, copyright, website and license | 
|         Gtk::AppChooserDialog | An application chooser dialog | 
|         Gtk::ColorChooserDialog | This dialog is for choosing a color | 
|         Gtk::ColorSelectionDialog | This dialog allows the user to select a color | 
|         Gtk::FileChooserDialog | Convenient file chooser window | 
|         Gtk::FontChooserDialog | A dialog box for selecting fonts | 
|         Gtk::FontSelectionDialog | A dialog box for selecting fonts | 
|         Gtk::MessageDialog | Convenient message window | 
|         Gtk::PageSetupUnixDialog | PageSetupUnixDialog implements a page setup dialog for platforms which don't provide a native page setup dialog, like Unix | 
|         Gtk::PrintUnixDialog | PrintUnixDialog implements a print dialog for platforms which don't provide a native print dialog, like Unix | 
|         Gtk::RecentChooserDialog | RecentChooserDialog is a dialog box suitable for displaying the recently used documents | 
|        Gtk::OffscreenWindow | A top-level container widget used to manage offscreen rendering of child widgets | 
|        Gtk::Plug |  | 
|      Gtk::Box | Organizes child widgets into a rectangular area | 
|       Gtk::AppChooserWidget | An application chooser widget that can be embedded in other widgets | 
|       Gtk::ButtonBox | A container for arranging buttons | 
|        Gtk::HButtonBox | A container for arranging buttons horizontally | 
|        Gtk::VButtonBox | A container for arranging buttons vertically | 
|       Gtk::FontChooserWidget | A dialog box for selecting fonts | 
|       Gtk::HBox | Horizontal Box for laying widgets in a horizontal row | 
|        Gtk::FileChooserButton | A button to launch a file chooser dialog | 
|        Gtk::InfoBar | This widget that can be used to show messages to the user without showing a dialog | 
|        Gtk::Statusbar | Text status indicator This widget is used to display status information | 
|       Gtk::VBox | Vertical Box for laying widgets in a vertical row | 
|        Gtk::ColorSelection | A widget used to select a color | 
|        Gtk::FileChooserWidget | File chooser widget that can be embedded in other widgets | 
|        Gtk::FontSelection | A widget for selecting fonts | 
|        Gtk::RecentChooserWidget | RecentChooserWidget is a widget suitable for selecting recently used files | 
|      Gtk::Fixed | A container which allows you to position widgets at fixed coordinates | 
|      Gtk::Grid | A container which arranges its child widgets in rows and columns | 
|      Gtk::IconView | The IconView provides an alternative view of a list model | 
|      Gtk::Layout | Infinite scrollable area containing child widgets and/or custom drawing | 
|      Gtk::MenuShell | The abstract base class for Gtk::Menu and Gtk::MenuBar | 
|       Gtk::Menu | A drop-down menu consisting of Gtk::MenuItem objects which can be navigated and activated by the user to perform application functions | 
|        Gtk::RecentChooserMenu | RecentChooserMenu is a widget suitable for displaying recently used files inside a menu | 
|       Gtk::MenuBar | A standard menu bar which usually holds Gtk::Menu submenu items | 
|      Gtk::Notebook | Container which shows one of its children at a time, in tabbed windows | 
|      Gtk::Paned | A widget with two adjustable panes | 
|       Gtk::HPaned | The Gtk::HPaned widget is a container widget with two children arranged horizontally | 
|       Gtk::VPaned | The Gtk::VPaned widget is a container widget with two children arranged vertically | 
|      Gtk::Socket | Container for widgets from other processes | 
|      Gtk::Table | Pack widgets in regular patterns | 
|      Gtk::TextView | Multi-line text editing widget | 
|      Gtk::Toolbar | Bars of buttons and other widgets | 
|      Gtk::ToolItemGroup | A ToolItemGroup is used together with ToolPalette to add ToolItems to a palette-like container with different categories and drag and drop support | 
|      Gtk::ToolPalette | A ToolPalette allows you to add ToolItems to a palette-like container with various categories and drag and drop support | 
|      Gtk::TreeView | Displays the model (Gtk::TreeModel) data and allows the user to interact with it | 
|       Gtk::ListViewText | A simple listbox which presents some lines of information in columns and lets the user select some of them | 
|     Gtk::DrawingArea | A widget for custom user interface elements | 
|     Gtk::Entry | A single line text entry field | 
|      Gtk::SearchEntry | This is a subclass of Gtk::Entry that has been tailored for use as a search entry | 
|      Gtk::SpinButton | Numeric Entry with up/down buttons Slightly misnamed, this should be called a SpinEntry | 
|     Gtk::Invisible | This widget is used internally in GTK+, and is probably not useful for application developers | 
|     Gtk::LevelBar | A bar that can used as a level indicator | 
|     Gtk::Misc | A base class for widgets with alignments and padding | 
|      Gtk::Arrow | Produces an arrow pointing in one of the four cardinal directions | 
|      Gtk::Image | A widget displaying an image | 
|      Gtk::Label | A widget that displays a small to medium amount of text | 
|       Gtk::AccelLabel | A label which displays an accelerator key on the right of the text | 
|     Gtk::ProgressBar | A widget which indicates progress visually | 
|     Gtk::Range | Base class for widgets which visualize an adjustment | 
|      Gtk::Scale | A slider widget for selecting a value from a range | 
|       Gtk::HScale | A horizontal slider for selecting values | 
|       Gtk::VScale | A vertical slider for selecting values | 
|      Gtk::Scrollbar | A Scrollbar | 
|       Gtk::HScrollbar | A horizontal scrollbar | 
|       Gtk::VScrollbar | A vertical scrollbar | 
|     Gtk::Separator | A separator widget | 
|      Gtk::HSeparator | Horizontal line widget | 
|      Gtk::VSeparator | Vertical line widget | 
|     Gtk::Spinner | A widget that displays a spinner animation | 
|     Gtk::Switch | A "light switch"-style toggle | 
|   Gdk::Color | Gdk::Color is used to describe an allocated or unallocated color | 
|   Gdk::Event |  | 
|   Gdk::PixbufFormat |  | 
|   Gdk::Point | This is a simple structure containing an x and y coordinate of a point | 
|   Gdk::Rectangle | Gdk::Rectangle is a structure holding the position and size of a rectangle | 
|   Gdk::RGBA | An RGBA Color | 
|   Gdk::TimeCoord | A Gdk::TimeCoord instance contains a single event of motion history | 
|   Glib::Exception [external] |  | 
|    Glib::Error [external] |  | 
|     Gdk::PixbufError | Exception class for Gdk::Pixbuf errors | 
|     Gtk::BuilderError | Exception class for Gdk::Builder errors | 
|     Gtk::FileChooserError | Exception class for Gdk::FileChooser errors | 
|     Gtk::IconThemeError | Exception class for Gdk::IconTheme errors | 
|     Gtk::PrintError |  | 
|     Gtk::RecentChooserError | Exception class for Gtk::RecentChooser errors | 
|     Gtk::RecentManagerError | Exception class for Gtk::RecentManager errors | 
|   Glib::ValueBase [external] |  | 
|    Glib::ValueBase_Boxed [external] |  | 
|     Glib::Value< Glib::RefPtr< Gtk::RecentInfo > > |  | 
|   Gtk::AccelKey | Defines accelerator key combinations | 
|   Gtk::Border | This specifies a border around a rectangular area that can be of a different width on each side | 
|   Gtk::BuiltinStockID | See the list of pre-defined stock items, in the Stock namespace | 
|   Gtk::FileFilter::Info |  | 
|   Gtk::IconInfo |  | 
|   Gtk::IconSet | This manages a set of variants of a particular icon An IconSet contains variants for different sizes and widget states | 
|   Gtk::IconSize | Represents registered icon sizes | 
|   Gtk::IconSource |  | 
|   Gtk::PaperSize | PaperSize handles paper sizes | 
|   Gtk::PrintSettings::Keys | Print settings keys | 
|   Gtk::PrintSettings::PageRange |  | 
|   Gtk::RadioButtonGroup | RadioButtonGroup identifier for RadioButtons To set up this RadioButtonGroup, construct a RadioButtonGroup and then pass it to the constructor of all radio items | 
|   Gtk::RecentFilter::Info | A RecentFilter::Info class is used to pass information about the tested file to filter() | 
|   Gtk::RecentInfo | Contains information found when looking up an entry of the recently used files list | 
|   Gtk::RecentManager::Data | Meta-data passed to add_item() | 
|   Gtk::SelectionData |  | 
|   Gtk::StockID | See also Gtk::BuiltinStockID | 
|   Gtk::StockItem |  | 
|   Gtk::TargetEntry |  | 
|   Gtk::TargetList |  | 
|   Gtk::TextAttributes |  | 
|   Gtk::TextIter | Typefed as Gtk::TextBuffer::iterator | 
|   Gtk::TreeIterBase |  | 
|    Gtk::TreeIter | A Gtk::TreeModel::iterator is a reference to a specific node on a specific model | 
|     Gtk::TreeNodeChildren | Typedefed as TreeModel::Children | 
|     Gtk::TreeRow | Typedefed as TreeModel::Row | 
|   Gtk::TreeModelColumnBase | Base class of TreeModelColumn templates | 
|    Gtk::TreeModelColumn< T > | A Gtk::TreeModelColumn describes the C++ type of the data in a model column, and identifies that column in the model | 
|   Gtk::TreeModelColumnRecord | Typedefed as TreeModel::ColumnRecord | 
|    Gtk::ListViewText::TextModelColumns |  | 
|   Gtk::TreePath | A path is essentially a potential node | 
|   Gtk::TreeRowReference | Typedefed as Gtk::TreeModel::RowReference | 
|   Gtk::TreeValueProxy< ColumnType > |  | 
|   Gtk::WidgetPath | This represents a widget hierarchy from the topmost widget, typically a toplevel, to any child | 
|   sigc::trackable [external] |  | 
|    Glib::ObjectBase [external] |  | 
|     Glib::Interface [external] |  | 
|      Gio::ActionGroup [external] |  | 
|       Gio::Application [external] |  | 
|        Gtk::Application | TODO | 
|       Gtk::ApplicationWindow | A Gtk::Window subclass with Gtk::Application support | 
|      Gio::ActionMap [external] |  | 
|       Gio::Application [external] |  | 
|       Gtk::ApplicationWindow | A Gtk::Window subclass with Gtk::Application support | 
|      Gio::Icon [external] |  | 
|       Gdk::Pixbuf |  | 
|       Gio::EmblemedIcon [external] |  | 
|        Gtk::NumerableIcon | A Gio::Icon that allows numbered emblems | 
|      Gtk::Actionable | This interface provides a convenient way of associating widgets with actions on a ApplicationWindow or Application | 
|      Gtk::Activatable | Activatable widgets can be connected to a Gtk::Action and reflect the state of the action | 
|       Gtk::Button | A widget that creates a signal when clicked on | 
|       Gtk::MenuItem | Child item for menus | 
|       Gtk::RecentChooserMenu | RecentChooserMenu is a widget suitable for displaying recently used files inside a menu | 
|       Gtk::Switch | A "light switch"-style toggle | 
|       Gtk::ToolItem |  | 
|      Gtk::AppChooser | This interface can be implemented by widgets which allow the user to choose an application (typically for the purpose of opening a file) | 
|       Gtk::AppChooserButton | A button to launch an application chooser dialog | 
|       Gtk::AppChooserDialog | An application chooser dialog | 
|       Gtk::AppChooserWidget | An application chooser widget that can be embedded in other widgets | 
|      Gtk::Buildable | A base class for objects that can be built by Gtk::Builder | 
|       Gtk::Action | An action which can be triggered by a menu or toolbar item | 
|        Gtk::RecentAction | An action of which represents a list of recently used files | 
|        Gtk::ToggleAction | An action which can be toggled between two states | 
|         Gtk::RadioAction | An action of which only one in a group can be active | 
|       Gtk::ActionGroup |  | 
|       Gtk::CellArea | An abstract base class for laying out CellRenderers | 
|        Gtk::CellAreaBox | A cell area that renders CellRenderers into a row or a colum, depending on its orientation | 
|       Gtk::EntryCompletion | Completion functionality for Gtk::Entry | 
|       Gtk::ListStore | Thist is a list model for use with a Gtk::TreeView widget | 
|       Gtk::SizeGroup | Gtk::SizeGroup provides a mechanism for grouping a number of widgets together so they all request the same amount of space | 
|       Gtk::TreeStore |  | 
|       Gtk::Widget | Abstract Widget (Base class for all widgets) | 
|      Gtk::CellEditable | Interface for widgets which are used for editing cells | 
|       Gtk::ComboBox | A widget used to choose from a list of items | 
|       Gtk::Entry | A single line text entry field | 
|      Gtk::CellLayout | An interface for packing cells | 
|       Gtk::CellArea | An abstract base class for laying out CellRenderers | 
|       Gtk::CellView | A widget displaying a single row of a TreeModel | 
|       Gtk::ComboBox | A widget used to choose from a list of items | 
|       Gtk::EntryCompletion | Completion functionality for Gtk::Entry | 
|       Gtk::IconView | The IconView provides an alternative view of a list model | 
|       Gtk::TreeViewColumn | Typedefed as Gtk::TreeView::Column | 
|      Gtk::ColorChooser | This interface can be implemented by widgets which allow the user to choose a color | 
|       Gtk::ColorChooserDialog | This dialog is for choosing a color | 
|      Gtk::Editable | Base class for text-editing widgets | 
|       Gtk::Entry | A single line text entry field | 
|      Gtk::FileChooser | Gtk::FileChooser is an interface that can be implemented by file selection widgets | 
|       Gtk::FileChooserButton | A button to launch a file chooser dialog | 
|       Gtk::FileChooserDialog | Convenient file chooser window | 
|       Gtk::FileChooserWidget | File chooser widget that can be embedded in other widgets | 
|      Gtk::FontChooser | An interface implemented by widgets displaying fonts | 
|       Gtk::FontChooserDialog | A dialog box for selecting fonts | 
|       Gtk::FontChooserWidget | A dialog box for selecting fonts | 
|      Gtk::Orientable | This interface is implemented by all widgets that can be oriented horizontally or vertically | 
|       Gtk::Box | Organizes child widgets into a rectangular area | 
|       Gtk::CellAreaBox | A cell area that renders CellRenderers into a row or a colum, depending on its orientation | 
|       Gtk::CellRendererProgress | Renders numbers as progress bars | 
|       Gtk::CellView | A widget displaying a single row of a TreeModel | 
|       Gtk::Grid | A container which arranges its child widgets in rows and columns | 
|       Gtk::Paned | A widget with two adjustable panes | 
|       Gtk::ProgressBar | A widget which indicates progress visually | 
|       Gtk::ScaleButton | A button which pops up a scale widget | 
|       Gtk::Scrollbar | A Scrollbar | 
|       Gtk::Separator | A separator widget | 
|       Gtk::ToolPalette | A ToolPalette allows you to add ToolItems to a palette-like container with various categories and drag and drop support | 
|      Gtk::PrintOperationPreview |  | 
|       Gtk::PrintOperation | PrintOperation is the high-level, portable printing API | 
|      Gtk::RecentChooser | RecentChooser is an interface that can be implemented by widgets displaying the list of recently used files | 
|       Gtk::RecentAction | An action of which represents a list of recently used files | 
|       Gtk::RecentChooserDialog | RecentChooserDialog is a dialog box suitable for displaying the recently used documents | 
|       Gtk::RecentChooserMenu | RecentChooserMenu is a widget suitable for displaying recently used files inside a menu | 
|       Gtk::RecentChooserWidget | RecentChooserWidget is a widget suitable for selecting recently used files | 
|      Gtk::Scrollable | This interface is implemented by widgets with native scrolling ability | 
|       Gtk::IconView | The IconView provides an alternative view of a list model | 
|       Gtk::Layout | Infinite scrollable area containing child widgets and/or custom drawing | 
|       Gtk::TextView | Multi-line text editing widget | 
|       Gtk::ToolPalette | A ToolPalette allows you to add ToolItems to a palette-like container with various categories and drag and drop support | 
|       Gtk::TreeView | Displays the model (Gtk::TreeModel) data and allows the user to interact with it | 
|       Gtk::Viewport | An adapter which makes widgets scrollable | 
|      Gtk::StyleProvider | This is a base class used to provide style information to a StyleContext | 
|       Gtk::CssProvider | CSS-like styling for widgets, implementing the StyleProvider base class | 
|      Gtk::ToolShell | A base class for containers containing ToolItem widgets | 
|       Gtk::Toolbar | Bars of buttons and other widgets | 
|       Gtk::ToolItemGroup | A ToolItemGroup is used together with ToolPalette to add ToolItems to a palette-like container with different categories and drag and drop support | 
|      Gtk::TreeDragDest |  | 
|       Gtk::ListStore | Thist is a list model for use with a Gtk::TreeView widget | 
|       Gtk::TreeStore |  | 
|      Gtk::TreeDragSource |  | 
|       Gtk::ListStore | Thist is a list model for use with a Gtk::TreeView widget | 
|       Gtk::TreeStore |  | 
|      Gtk::TreeModel | This class defines a generic tree interface for use by the Gtk::TreeView widget | 
|       Gtk::ListStore | Thist is a list model for use with a Gtk::TreeView widget | 
|       Gtk::TreeModelFilter |  | 
|       Gtk::TreeModelSort | A wrapper which makes an underlying Gtk::TreeModel sortable | 
|       Gtk::TreeStore |  | 
|      Gtk::TreeSortable |  | 
|       Gtk::ListStore | Thist is a list model for use with a Gtk::TreeView widget | 
|       Gtk::TreeModelSort | A wrapper which makes an underlying Gtk::TreeModel sortable | 
|       Gtk::TreeStore |  | 
|     Glib::Object [external] |  | 
|      Gdk::Cursor | This represents a cursor | 
|      Gdk::Device | A Gdk::Device instance contains a detailed description of an extended input device | 
|      Gdk::DeviceManager | Functions for handling input devices | 
|      Gdk::Display | Gdk::Display object's purpose is two fold: To grab/ungrab keyboard focus and mouse pointer To manage and provide information about the Gdk::Screen(s) available for this Gdk::Display | 
|      Gdk::DisplayManager | The purpose of the GdkDisplayManager singleton object is to offer notification when displays appear or disappear or the default display changes | 
|      Gdk::DragContext | A Gdk::DragContext holds information about a drag in progress | 
|      Gdk::Pixbuf |  | 
|      Gdk::PixbufAnimation | The gdk-pixbuf library provides a simple mechanism to load and represent animations | 
|      Gdk::PixbufAnimationIter | An iterator which points to a certain position in a PixbufAnimation | 
|      Gdk::PixbufLoader |  | 
|      Gdk::Screen | Object representing a physical screen Gdk::Screen objects are the GDK representation of a physical screen | 
|      Gdk::Visual | A Gdk::Visual describes a particular video hardware display format | 
|      Gdk::Window | A Gdk::Window is a rectangular region on the screen | 
|      Gio::AppLaunchContext [external] |  | 
|       Gdk::AppLaunchContext | This is an implementation of Gio::AppLaunchContext that handles launching an application in a graphical context | 
|      Gio::Application [external] |  | 
|      Gio::EmblemedIcon [external] |  | 
|      Gtk::AccelGroup | A Gtk::AccelGroup represents a group of keyboard accelerators, typically attached to a toplevel Gtk::Window (with Gtk::Window::add_accel_group()) | 
|      Gtk::Action | An action which can be triggered by a menu or toolbar item | 
|      Gtk::ActionGroup |  | 
|      Gtk::Adjustment | A class representing an adjustable bounded value | 
|      Gtk::Builder | Build an interface from a UI definition description | 
|      Gtk::CellArea | An abstract base class for laying out CellRenderers | 
|      Gtk::CellAreaContext | This stores geometrical information for a series of rows in a CellArea | 
|      Gtk::Clipboard | The Clipboard object represents a clipboard of data shared between different processes or between different widgets in the same process | 
|      Gtk::CssProvider | CSS-like styling for widgets, implementing the StyleProvider base class | 
|      Gtk::EntryBuffer | A Text buffer for the Entry widget | 
|      Gtk::EntryCompletion | Completion functionality for Gtk::Entry | 
|      Gtk::FileFilter | A filter for selecting a file subset | 
|      Gtk::IconFactory |  | 
|      Gtk::IconTheme |  | 
|      Gtk::ListStore | Thist is a list model for use with a Gtk::TreeView widget | 
|      Gtk::Object | Gtk::Object is the base class for all widgets, and for a few non-widget objects such as Gtk::Adjustment | 
|       Gtk::CellRenderer | CellRenderers are used by Gtk::TreeView columns to render the Gtk::TreeModel column data appropriately | 
|        Gtk::CellRendererPixbuf | Renders a pixbuf in a cell | 
|        Gtk::CellRendererProgress | Renders numbers as progress bars | 
|        Gtk::CellRendererSpinner | Renders a spinning animation in a cell | 
|        Gtk::CellRendererText | Renders text in a cell | 
|         Gtk::CellRendererAccel | Renders a keyboard accelerator in a cell | 
|         Gtk::CellRendererCombo | Renders a combobox in a cell | 
|         Gtk::CellRendererSpin | Renders a spin button in a cell | 
|        Gtk::CellRendererToggle | Renders a toggle button in a cell | 
|       Gtk::TreeViewColumn | Typedefed as Gtk::TreeView::Column | 
|       Gtk::Widget | Abstract Widget (Base class for all widgets) | 
|      Gtk::PageSetup | A PageSetup object stores the page size, orientation and margins | 
|      Gtk::PrintContext | A PrintContext encapsulates context information that is required when drawing pages for printing, such as the cairo context and important parameters like page size and resolution | 
|      Gtk::Printer | A Printer object represents a printer | 
|      Gtk::PrintJob | A PrintJob object represents a job that is sent to a printer | 
|      Gtk::PrintOperation | PrintOperation is the high-level, portable printing API | 
|      Gtk::PrintSettings | A PrintSettings object represents the settings of a print dialog in a system-independent way | 
|      Gtk::RecentFilter | RecentFilter can be used to restrict the files being shown in a RecentChooser | 
|      Gtk::RecentManager | RecentManager provides a facility for adding, removing and looking up recently used files | 
|      Gtk::Settings | Sharing settings between applications | 
|      Gtk::SizeGroup | Gtk::SizeGroup provides a mechanism for grouping a number of widgets together so they all request the same amount of space | 
|      Gtk::StatusIcon | The "system tray" or notification area is normally used for transient icons that indicate some special state | 
|      Gtk::StyleContext | This object stores styling information affecting a widget defined by WidgetPath | 
|      Gtk::TextBuffer | Multi-line attributed text that can be displayed by one or more Gtk::TextView widgets | 
|      Gtk::TextChildAnchor | A TextChildAnchor is a spot in the buffer where child widgets can be "anchored" (inserted inline, as if they were characters) | 
|      Gtk::TextMark | Typedefed as Gtk::TextBuffer::Mark | 
|      Gtk::TextTag | Typedefed as Gtk::TextBuffer::Tag | 
|      Gtk::TextTagTable | Typedefed as Gtk::TextBuffer::TagTable | 
|      Gtk::Tooltip | Add tips to your widgets | 
|      Gtk::TreeModelFilter |  | 
|      Gtk::TreeModelSort | A wrapper which makes an underlying Gtk::TreeModel sortable | 
|      Gtk::TreeSelection | Typedefed as Gtk::TreeView::Selection | 
|      Gtk::TreeStore |  | 
|      Gtk::UIManager | Constructing menus and toolbars from an XML description | 
|      Gtk::WindowGroup | Limit the effect of grabs | 
|    Gtk::Main | Main application class |