This document is for the GTK+ 4 library, version 3.90.0 . The latest versions can be found online at If you are looking for the older GTK+ 3 series of libraries, see

I. GTK+ Overview
Getting Started with GTK+
Building user interfaces
Building applications
A trivial application
Populating the window
Opening files
An application menu
A preference dialog
Adding a search bar
Adding a side bar
Header bar
Custom Drawing
Mailing lists and bug reports — Getting help with GTK+
Common Questions — Find answers to common questions in the GTK+ manual
The GTK+ Drawing Model — The GTK+ drawing model in detail
The GTK+ Input and Event Handling Model — GTK+ input and event handling in detail
II. GTK+ Widgets and Objects
Object Hierarchy
Widget Gallery
Application support
GtkApplication — Application class
GtkApplicationWindow — GtkWindow subclass with GtkApplication support
GtkActionable — An interface for widgets that can be associated with actions
Interface builder
GtkBuilder — Build an interface from an XML UI definition
GtkBuildable — Interface for objects that can be built by GtkBuilder
GtkWindow — Toplevel which can contain other widgets
GtkDialog — Create popup windows
GtkMessageDialog — A convenient message window
GtkAboutDialog — Display information about an application
GtkAssistant — A widget used to guide users through multi-step operations
GtkInvisible — A widget which is not displayed
GtkWindowGroup — Limit the effect of grabs
Layout Containers
GtkBox — A container box
GtkGrid — Pack widgets in rows and columns
GtkRevealer — Hide and show with animation
GtkListBox — A list container
GtkFlowBox — A container that allows reflowing its children
GtkStack — A stacking container
GtkStackSwitcher — A controller for GtkStack
GtkStackSidebar — An automatic sidebar widget
GtkActionBar — A full width bar for presenting contextual actions
GtkHeaderBar — A box with a centered child
GtkOverlay — A container which overlays widgets on top of each other
GtkButtonBox — A container for arranging buttons
GtkPaned — A widget with two adjustable panes
GtkLayout — Infinite scrollable area containing child widgets and/or custom drawing
GtkNotebook — A tabbed notebook container
GtkExpander — A container which can hide its child
GtkOrientable — An interface for flippable widgets
GtkAspectFrame — A frame that constrains its child to a particular aspect ratio
GtkFixed — A container which allows you to position widgets at fixed coordinates
Display Widgets
GtkLabel — A widget that displays a small to medium amount of text
GtkImage — A widget displaying an image
GtkSpinner — Show a spinner animation
GtkInfoBar — Report important messages to the user
GtkProgressBar — A widget which indicates progress visually
GtkLevelBar — A bar that can used as a level indicator
GtkStatusbar — Report messages of minor importance to the user
GtkAccelLabel — A label which displays an accelerator key on the right of the text
Buttons and Toggles
GtkButton — A widget that emits a signal when clicked on
GtkCheckButton — Create widgets with a discrete toggle button
GtkRadioButton — A choice from multiple check buttons
GtkToggleButton — Create buttons which retain their state
GtkLinkButton — Create buttons bound to a URL
GtkMenuButton — A widget that shows a popup when clicked on
GtkSwitch — A “light switch” style toggle
GtkScaleButton — A button which pops up a scale
GtkVolumeButton — A button which pops up a volume control
GtkLockButton — A widget to unlock or lock privileged operations
GtkModelButton — A button that uses a GAction as model
Numeric and Text Data Entry
GtkEntry — A single line text entry field
GtkEntryBuffer — Text buffer for GtkEntry
GtkEntryCompletion — Completion functionality for GtkEntry
GtkScale — A slider widget for selecting a value from a range
GtkSpinButton — Retrieve an integer or floating-point number from the user
GtkSearchEntry — An entry which shows a search icon
GtkSearchBar — A toolbar to integrate a search entry with
GtkEditable — Interface for text-editing widgets
Multiline Text Editor
Text Widget Overview — Overview of GtkTextBuffer, GtkTextView, and friends
GtkTextIter — Text buffer iterator
GtkTextMark — A position in the buffer preserved across buffer modifications
GtkTextBuffer — Stores attributed text for display in a GtkTextView
GtkTextTag — A tag that can be applied to text in a GtkTextBuffer
GtkTextTagTable — Collection of tags that can be used together
GtkTextView — Widget that displays a GtkTextBuffer
Tree, List and Icon Grid Widgets
Tree and List Widget Overview — Overview of GtkTreeModel, GtkTreeView, and friends
GtkTreeModel — The tree interface used by GtkTreeView
GtkTreeSelection — The selection object for GtkTreeView
GtkTreeViewColumn — A visible column in a GtkTreeView widget
GtkTreeView — A widget for displaying both trees and lists
GtkTreeView drag-and-drop — Interfaces for drag-and-drop support in GtkTreeView
GtkCellView — A widget displaying a single row of a GtkTreeModel
GtkIconView — A widget which displays a list of icons in a grid
GtkTreeSortable — The interface for sortable models used by GtkTreeView
GtkTreeModelSort — A GtkTreeModel which makes an underlying tree model sortable
GtkTreeModelFilter — A GtkTreeModel which hides parts of an underlying tree model
GtkCellLayout — An interface for packing cells
GtkCellArea — An abstract class for laying out GtkCellRenderers
GtkCellAreaBox — A cell area that renders GtkCellRenderers into a row or a column
GtkCellAreaContext — Stores geometrical information for a series of rows in a GtkCellArea
GtkCellRenderer — An object for rendering a single cell
GtkCellEditable — Interface for widgets which can are used for editing cells
GtkCellRendererAccel — Renders a keyboard accelerator in a cell
GtkCellRendererCombo — Renders a combobox in a cell
GtkCellRendererPixbuf — Renders a pixbuf in a cell
GtkCellRendererProgress — Renders numbers as progress bars
GtkCellRendererSpin — Renders a spin button in a cell
GtkCellRendererText — Renders text in a cell
GtkCellRendererToggle — Renders a toggle button in a cell
GtkCellRendererSpinner — Renders a spinning animation in a cell
GtkListStore — A list-like data structure that can be used with the GtkTreeView
GtkTreeStore — A tree-like data structure that can be used with the GtkTreeView
Menus, Combo Box, Toolbar
GtkComboBox — A widget used to choose from a list of items
GtkComboBoxText — A simple, text-only combo box
GtkMenu — A menu widget
GtkMenuBar — A subclass of GtkMenuShell which holds GtkMenuItem widgets
GtkMenuItem — The widget used for item in menus
GtkRadioMenuItem — A choice from multiple check menu items
GtkCheckMenuItem — A menu item with a check box
GtkSeparatorMenuItem — A separator used in menus
GtkToolShell — Interface for containers containing GtkToolItem widgets
GtkToolbar — Create bars of buttons and other widgets
GtkToolItem — The base class of widgets that can be added to GtkToolShell
GtkToolPalette — A tool palette with categories
GtkToolItemGroup — A sub container used in a tool palette
GtkSeparatorToolItem — A toolbar item that separates groups of other toolbar items
GtkToolButton — A GtkToolItem subclass that displays buttons
GtkMenuToolButton — A GtkToolItem containing a button with an additional dropdown menu
GtkToggleToolButton — A GtkToolItem containing a toggle button
GtkRadioToolButton — A toolbar item that contains a radio button
GtkPopover — Context dependent bubbles
GtkPopoverMenu — Popovers to use as menus
Selector Widgets and Dialogs
GtkColorChooser — Interface implemented by widgets for choosing colors
GtkColorButton — A button to launch a color selection dialog
GtkColorChooserWidget — A widget for choosing colors
GtkColorChooserDialog — A dialog for choosing colors
GtkFileChooser — File chooser interface used by GtkFileChooserWidget and GtkFileChooserDialog
GtkFileChooserButton — A button to launch a file selection dialog
GtkFileChooserNative — A native file chooser dialog, suitable for “File/Open” or “File/Save” commands
GtkFileChooserDialog — A file chooser dialog, suitable for “File/Open” or “File/Save” commands
GtkFileChooserWidget — A file chooser widget
GtkFileFilter — A filter for selecting a file subset
GtkFontChooser — Interface implemented by widgets displaying fonts
GtkFontButton — A button to launch a font chooser dialog
GtkFontChooserWidget — A widget for selecting fonts
GtkFontChooserDialog — A dialog for selecting fonts
GtkPlacesSidebar — Sidebar that displays frequently-used places in the file system
GtkFrame — A bin with a decorative frame and optional label
GtkSeparator — A separator widget
GtkScrollbar — A Scrollbar
GtkScrolledWindow — Adds scrollbars to its child widget
GtkScrollable — An interface for scrollable widgets
GtkPrintOperation — High-level Printing API
GtkPrintContext — Encapsulates context for drawing pages
GtkPrintSettings — Stores print settings
GtkPageSetup — Stores page setup information
GtkPaperSize — Support for named paper sizes
GtkPrinter — Represents a printer
GtkPrintJob — Represents a print job
GtkPrintUnixDialog — A print dialog
GtkPageSetupUnixDialog — A page setup dialog
Shortcuts Overview
GtkShortcutsWindow — Toplevel which shows help for shortcuts
GtkShortcutsSection — Represents an application mode in a GtkShortcutsWindow
GtkShortcutsGroup — Represents a group of shortcuts in a GtkShortcutsWindow
GtkShortcutsShortcut — Represents a keyboard shortcut in a GtkShortcutsWindow
GtkAdjustment — A representation of an adjustable bounded value
GtkCalendar — Displays a calendar and allows the user to select a date
GtkDrawingArea — A simple widget for custom user interface elements
GtkGLArea — A widget for custom drawing with OpenGL
GtkEventBox — A widget used to catch events for widgets which do not have their own window
GtkIMContextSimple — An input method context supporting table-based input methods
GtkIMMulticontext — An input method context supporting multiple, loadable input methods
GtkSizeGroup — Grouping widgets so they request the same size
GtkTooltip — Add tips to your widgets
GtkViewport — An adapter which makes widgets scrollable
GtkAccessible — Accessibility support for widgets
GtkSnapshot — Auxiliary object for snapshots
Abstract Base Classes
GtkWidget — Base class for all widgets
GtkContainer — Base class for widgets which contain other widgets
GtkBin — A container with just one child
GtkMenuShell — A base class for menu objects
GtkRange — Base class for widgets which visualize an adjustment
GtkIMContext — Base class for input method contexts
GtkNativeDialog — Integrate with native dialogs
Recently Used Documents
GtkRecentManager — Managing recently used files
GtkRecentChooser — Interface implemented by widgets displaying recently used files
GtkRecentChooserDialog — Displays recently used files in a dialog
GtkRecentChooserMenu — Displays recently used files in a menu
GtkRecentChooserWidget — Displays recently used files
GtkRecentFilter — A filter for selecting a subset of recently used files
Choosing from installed applications
GtkAppChooser — Interface implemented by widgets for choosing an application
GtkAppChooserButton — A button to launch an application chooser dialog
GtkAppChooserDialog — An application chooser dialog
GtkAppChooserWidget — Application chooser widget that can be embedded in other widgets
Gestures and event handling
GtkEventController — Self-contained handler of series of events
GtkGesture — Base class for gestures
GtkGestureSingle — Base class for mouse/single-touch gestures
GtkGestureDrag — Drag gesture
GtkGestureLongPress — "Press and Hold" gesture
GtkGestureMultiPress — Multipress gesture
GtkGesturePan — Pan gesture
GtkGestureSwipe — Swipe gesture
GtkGestureRotate — Rotate gesture
GtkGestureZoom — Zoom gesture
GtkPadController — Controller for drawing tablet pads
III. GTK+ Core Reference
Main loop and Events — Library initialization, main event loop, and events
Version Information — Variables and functions to check the GTK+ version
Accelerator Groups — Groups of global keyboard accelerators for an entire GtkWindow
Accelerator Maps — Loadable keyboard accelerator specifications
Clipboards — Storing data on clipboards
Drag and Drop — Functions for controlling drag and drop handling
Settings — Sharing settings between applications
Bindings — Key bindings for individual widgets
Standard Enumerations — Public enumerated types used throughout GTK+
Selections — Functions for handling inter-process communication via selections
Testing — Utilities for testing GTK+ applications
Filesystem utilities — Functions for working with GIO
IV. Theming in GTK+
GTK+ CSS — Overview of CSS in GTK+
GTK+ CSS — GTK+ CSS Properties
GtkStyleContext — Rendering UI elements
GtkCssProvider — CSS-like styling for widgets
GtkStyleProvider — Interface to provide style information to GtkStyleContext
GtkWidgetPath — Widget path abstraction
GtkIconTheme — Looking up icons by name
V. Migrating from Previous Versions of GTK+
Migrating from GTK+ 2.x to GTK+ 4
Migrating from GTK+ 3.x to GTK+ 4
Preparation in GTK+ 3.x
Do not use deprecated symbols
Do not use widget style properties
Review your window creation flags
Stop using non-RGBA visuals
Stop using GtkBox::padding
Stop using the state argument of GtkStyleContext getters
Stop using gdk_pixbuf_get_from_window() and gdk_cairo_set_source_window()
Changes that need to be done at the time of the switch
Adapt to GdkWindow API changes
Adapt to GtkStyleContext API changes
Adapt to GtkCssProvider API changes
Stop using GtkContainer::border-width
Adapt to GtkWidget's size request changes
Switch to GtkWidget's children APIs
Don't use -gtk-gradient in your CSS
Don't use -gtk-icon-effect in your CSS
Use gtk_widget_measure
Adapt to drawing model changes
Stop using APIs to query GdkWindows
Adapt to changes in animated hiding and showing of widgets
Stop passing commandline arguments to gtk_init()
VI. GTK+ Tools
gtk4-demo — Demonstrate GTK+ widgets
gtk4-demo-application — Demonstrate GtkApplication
gtk4-widget-factory — Demonstrate GTK+ widgets
gtk4-icon-browser — List themed icons
gtk4-query-immodules — Input method module registration utility
gtk4-update-icon-cache — Icon theme caching utility
gtk4-encode-symbolic-svg — Symbolic icon conversion utility
gtk4-builder-tool — GtkBuilder file utility
gtk4-launch — Launch an application
gtk4-query-settings — Utility to print name and value of all GtkSettings properties
gtk4-broadwayd — Broadway display server
VII. GTK+ Platform Support
Compiling the GTK+ libraries — How to compile GTK+ itself
Compiling GTK+ Applications — How to compile your GTK+ application
Running GTK+ Applications — How to run and debug your GTK+ application
Using GTK+ on the X Window System — X11-specific aspects of using GTK+
Using GTK+ on Windows — Windows-specific aspects of using GTK+
Using GTK+ on Mac OS X — OS X-specific aspects of using GTK+
Using GTK+ with Broadway — HTML-specific aspects of using GTK+
Using GTK+ with Wayland — Wayland-specific aspects of using GTK+
Using GTK+ with Mir — Mir-specific aspects of using GTK+
Index of all symbols
Annotation Glossary