Software:GTK

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Short description: Free and open-source cross-platform widget toolkit for creating graphical user interfaces
GTK
GTK logo.svg
Gtk4-widget-factory demos.png
GTK version 4 (gtk4-widget-factory, a collection of examples that demonstrate many of the GUI widgets)
Original author(s)Spencer Kimball, Peter Mattis
Developer(s)The GNOME Project, eXperimental Computing Facility (XCF)
Initial releaseApril 14, 1998; 26 years ago (1998-04-14)
Stable release
4.13.2 / January 7, 2023; 18 months ago (2023-01-07)
Preview release
4.11.1 / April 3, 2023; 15 months ago (2023-04-03)
Written inC, CSS[1]
Operating systemLinux, Unix-like, macOS, Windows
TypeWidget toolkit
LicenseLGPLv2.1+
Websitegtk.org

GTK (formerly GIMP ToolKit[2] and GTK+[3]) is a free and open-source cross-platform widget toolkit for creating graphical user interfaces (GUIs).[4] It is licensed under the terms of the GNU Lesser General Public License, allowing both free and proprietary software to use it. It is one of the most popular toolkits for the Wayland and X11 windowing systems.[5]

The GTK team releases new versions on a regular basis.[6] GTK 4 and GTK 3 are maintained, while GTK 2 is end-of-life.[7] GTK1 is independently maintained by the CinePaint project.[8]

Software architecture

The GTK toolkit
Simplified software architecture of GTK. Pango, GDK, ATK, GIO, Cairo and GLib
GDK contains back-ends to X11, Wayland, Broadway (HTTP), Quartz, and GDI and relies on Cairo for the rendering. Its new SceneGraph is work-in-progress.

The GTK library contains a set of graphical control elements (widgets); version 3.22.16 contains 186 active and 36 deprecated widgets.[9] GTK is an object-oriented widget toolkit written in the programming language C; it uses GObject, that is the GLib object system, for the object orientation. While GTK is mainly for windowing systems based on X11 and Wayland, it works on other platforms, including Microsoft Windows (interfaced with the Windows API), and macOS (interfaced with Quartz). There is also an HTML5 back-end named Broadway.[10][11]

GTK can be configured to change the look of the widgets drawn; this is done using different display engines. Several display engines exist which try to emulate the look of the native widgets on the platform in use.

Starting with version 2.8, released in 2005, GTK began the transition to using Cairo to render most of its graphical control elements widgets.[12] Since GTK version 3.0, all rendering is done using Cairo.[13]

On 26 January 2018 at DevConf.cz, Matthias Clasen gave an overview of the current state of GTK 4 development, including a high-level explanation of how rendering and input worked in GTK 3, what changes are being made in GTK 4 (>3.90), and why.[14] On 6 February 2019 it was announced that GTK 4 will drop the “+” from the project's name.[3]

GTK Drawing Kit (GDK)

Main page: Software:GDK

GDK acts as a wrapper around the low-level functions provided by the underlying windowing and graphics systems.

GTK Scene Graph Kit (GSK)

Main page: Software:GTK Scene Graph Kit

GSK is the rendering and scene graph API for GTK. GSK lies between the graphical control elements (widgets) and the rendering. GSK was finally merged into GTK version 3.90 released March 2017.

GtkInspector

GtkInspector was introduced with version 3.14.[15][16] GtkInspector can only be invoked after installing the development package libgtk-3-dev/gtk+-devel.

GUI designers

There are several GUI designers for GTK. The following projects were active as of July 2011:

  • Glade, supports GtkBuilder, which is a GTK built-in GUI description format.
  • Gazpacho, GUI builder for the GTK toolkit written in Python[17]
  • Crow Designer, relies on its own GuiXml format and GuiLoader library.[18]
  • Stetic, part of MonoDevelop, oriented toward Gtk#.
  • Gambas since version 2.0 atop BASIC
  • Xojo on Linux
  • Lazarus on Linux defaults to interfacing with GTK 2

GtkBuilder

GtkBuilder allows user interfaces to be designed without writing code. The interface is described in an Extensible Markup Language (XML) file, which is then loaded at runtime and the objects created automatically. The Glade Interface Designer allows creation of the user interface in a what you see is what you get (WYSIWYG) manner. The description of the user interface is independent from the programming language being used.

Language bindings

Language bindings are available for using GTK from languages other than C, including C++, Genie, JavaScript, Perl, Python, Vala, and others.[19]

GtkSharp, not to be confused with Gtk#, supports GTK 3.

Gtk#

Gtk#
Gtk Sharp Logo.png
Developer(s)Xamarin
Initial releaseMarch 12, 2004; 20 years ago (2004-03-12)
Stable release
2.12.41[20] / September 22, 2016; 7 years ago (2016-09-22)
Preview release
2.99.3 (for GTK3)[20] / June 6, 2014; 10 years ago (2014-06-06)
Written inC#, XML, Perl, C
Operating systemWindows, macOS, Linux
TypeWidget toolkit
LicenseGNU Lesser General Public License
Websitemono-project.com/GtkSharp

Gtk# is a set of .NET Framework bindings for the GTK graphical user interface (GUI) toolkit and assorted GNOME libraries. The library facilitates building graphical GNOME applications using Mono or any other compliant Common Language Runtime (CLR). Gtk# is an event-driven system like any other modern windowing library where every widget allows associating handler methods, which get called when certain events occur.[citation needed]

Applications built using Gtk# will run on many platforms including Linux, Windows and macOS. The Mono packages for Windows include GTK, Gtk# and a native theme to make applications look like native Windows applications. Starting with Mono 1.9, running Gtk# applications on macOS no longer requires running an X11 server.[21]

Glade Interface Designer can be used with the Glade# bindings to easily design GUI applications. A GUI designer named Stetic is integrated with the MonoDevelop integrated development environment (IDE).

In addition to support the standard GTK/GNOME stack of development tools, the gtk-dotnet.dll assembly provides a bridge to consume functionality available on the .NET stack. At this point this includes the functionality to use System.Drawing to draw on a widget.[citation needed]

(As of September 2020), Gtk# support for Gtk3 remains in the preview phase and forked projects, such as GtkSharp, have been founded to provide full Gtk3 support for C# and other CLI languages. The lack of a released version of Gtk# with support for Gtk3 was cited as a reason to remove the Banshee media player in Ubuntu 12.04.[22]

Development

GTK is mainly developed by The GNOME Project, which also develops the GNOME Development Platform and the GNOME Desktop Environment.[23]

GTK development is loosely managed. Discussion chiefly occurs on several public mailing lists.[24] GNOME developers and users gather at an annual GNOME Users And Developers European Conference GUADEC meeting to discuss GNOME's current state and future direction.[25] GNOME incorporates standards and programs from freedesktop.org to better interoperate with other desktops.[citation needed]

GTK is mainly written in C.[26] Many language bindings are available.

On September 1, 2016, a post on the GTK development blog denoted, among other things, the future numbering scheme of GTK.[27] GTK version 3.22, released in Autumn 2016, was planned to be the last 3.x release, although version 3.24 followed in Fall 2018 with the delay of GTK 4.[28]

Build automation

GTK (and GNOME, GLib, etc.) formerly utilized the GNU Build System (named Autotools) as the build automation system of choice.

Since August 14, 2017, the master branch of GTK has been built with Meson, and the Autotools build system files have been dropped.[29]

Criticism

The most common criticism of GTK is the lack of backward-compatibility in major updates, most notably in the application programming interface (API)[30] and theming.[31]

The compatibility breaks between minor releases during the GTK 3.x development cycle was explained by Benjamin Otte as due to strong pressures to innovate, such as providing the features modern users expect and supporting the increasingly influential Wayland display server protocol. With the release of GTK 4, the pressure from the need to innovate will have been released and the balance between stability and innovation will tip toward stability.[32] Similarly, recent changes to theming are specifically intended to improve and stabilise that part of the API, meaning some investment now should be rewarded later.

  • Dirk Hohndel, codeveloper of Subsurface and member of Intel's Open-Source Technology Center, criticized the GTK developers for being abrasive and ignoring most community requests.[33]
  • Hong Jen Yee, developer of LXDE (the GTK version of which was dropped and all efforts focused on the Qt port), expressed disdain for version 3 of the GTK toolkit's radical API changes and increased memory usage, and ported PCMan File Manager (PCManFM) to Qt. PCManFM is being developed with a GTK and with a Qt backend at the same time.[34]
  • The Audacious music player moved to Qt in version 3.6.[35] The reasons stated by the developers for this include a transition to client-side window decorations, which they claim cause the application to look "GNOME-y and out of place."[36]
  • Wireshark has switched to Qt due to not having a good experience with GTK's cross-platform support.[37]

Use

The GTK support for Wayland, co-requisites applications to be adapted to Wayland also
Screenshot of GIMP 2.8 - GTK is responsible for managing the interface components of the program, including the menus, buttons, and input fields.

Applications

Some notable applications that use GTK as a widget toolkit include:



Desktop environments

Several desktop environments utilize GTK as the widget toolkit.

Current

  • GNOME, based on GTK, meaning that programs native to GNOME use GTK
  • Budgie, built from scratch for the SolusOS successor, Solus Operating System
  • Cinnamon, a fork of GNOME 3 which uses GTK version 3
  • MATE, a fork of GNOME 2 which uses GTK 3 since version 1.18
  • Xfce, based on GTK 3 since version 4.14
  • Pantheon uses GTK 3 exclusively, being developed by elementary OS
  • Sugar, a desktop environment for youth primary education, which uses GTK, especially PyGTK
  • Phosh, a mobile UI designed for PureOS
  • LXDE (Lightweight X11 Desktop Environment) is based on GTK 2
  • Unity, the former default desktop environment of Ubuntu

Inactive

Miscellaneous

GTK programs can be run on desktop environments based on X11 and Wayland, or window managers even those not made with GTK, provided the needed libraries are installed; this includes macOS if X11.app is installed. GTK can be also run on Microsoft Windows, where it is used by some popular cross-platform applications like Pidgin and GIMP. wxWidgets, a cross-platform GUI tool-kit, uses GTK on Linux by default.[38] Other ports include DirectFB (used by the Debian installer, for example) and ncurses.[39]

Window managers

The following window managers use GTK:



GtkSourceView

For syntax highlighting there is GtkSourceView, "source code editing widget". GtkSourceView is maintained by GNOME separately from GTK as a library: gtksourceview. There are plans to rename to gsv.[citation needed]

GtkSpell

GtkSpell is a library separate from GTK. GtkSpell depends on GTK and Enchant. Enchant is a wrapper for ispell, hunspell, etc., the actual spell checker engine/software. GtkSpell uses GTK's GtkTextView widget, to highlight misspelled words and offer replacement.

History

Linux

GTK was originally designed and used in the GNU Image Manipulation Program (GIMP) as a replacement of the Motif toolkit; at some point Peter Mattis became disenchanted with Motif and began to write his own GUI toolkit named the GIMP toolkit and had successfully replaced Motif by the 0.60 release of GIMP.[40] Finally GTK was re-written to be object-oriented and was renamed GTK+.[41] This was first used in the 0.99 release of GIMP. GTK was subsequently adopted for maintenance by the GNOME Foundation, which uses it in the GNOME desktop environment.

The GTK 2.0.0 release series introduced new features which include improved text rendering using Pango, a new theme engine, improved accessibility using the Accessibility Toolkit, transition to Unicode using UTF-8 strings, and a more flexible API. Starting with version 2.8, GTK 2 depends on the Cairo graphics library for rendering vector graphics.

GTK version 3.0.0 included revised input device handling, support for themes written with CSS-like syntax, and the ability to receive information about other opened GTK applications.

The '+' was dropped returning to simply 'GTK' in February 2019 during a Hackathon.[42]

macOS

With Quartz-backend[43] GTK is available in macOS.[44]

Windows

  • After GTK 2.24.10 and 3.6.4 Development of Windows with Installer was closed by Gnome. Installation of MSYS2 on Windows is a good way to use actual GTK.[45]
  • GTK 2.24.10 and 3.6.4 is available in Internet, but very buggy and limited against actual versions.[46][47]
  • A version for Windows 64-bit is prepared by Tom Schoonjans with 2.24.33 (actual like Linux) and 3.24.24 (actual like Linux) from January 2021 available.[48]
  • Windows 10's Fall Creators Update includes Windows Subsystem for Linux (WSL). With Linux distributions like Ubuntu or Debian available from the Microsoft Store and an X server like Xming or VcXsvr, thousands of programs like GTK 2 or 3 can run with X or terminal support.

OpenVMS

HP stated that their goal was to merge the needed OpenVMS changes into the GTK Version 1.3 development stream, however this never materialised.[49] The latest version of GTK for OpenVMS is version 1.2.10.[50]

GTK 4

One of the cardinal novelties implemented during the GTK 4 development cycle (i.e. GTK 3.92, etc.) has been the removal of customization options for the user side (like individual keyboard shortcuts that could be set in GTK+ 2), and the delegation of functionality to ancillary objects instead of encoding it into the base classes provided by GTK.

  • the event handling from signal handlers described by GtkWidget is delegated to event controllers
  • the rendering is delegated to GtkSnapshot objects
  • the layout mechanism from GtkWidget is delegated to GtkLayoutManager

In January 2018 at DevConf.cz Matthias Clasen gave an overview of the then current state of GTK 4 development, including a high-level explanation of how rendering and input worked in GTK 3, what changes were being made to GTK 4, and the reasons for those changes. Examples of things that have become possible with GTK 4 were given as well.[51]

Releases

{{{2}}}
Release series Initial release Major enhancements Latest minor version
1.0 1998-04-13[52] First stable version 1.0.6
1.2 1999-02-25[53] New widgets:
  • GtkFontSelector
  • GtkPacker
  • GtkItemFactory
  • GtkCTree
  • GtkInvisible
  • GtkCalendar
  • GtkLayout
  • GtkPlug
  • GtkSocket
 1.2.10
2.0 2002-03-11[54] GObject

Overall support for UTF-8

2.0.9
2.2 2002-12-22[55] Multihead support 2.2.4
2.4 2004-03-16[56] New widgets:
  • GtkFileChooser
  • GtkComboBox
  • GtkComboBoxEntry
  • GtkExpander
  • GtkFontButton
  • GtkColorButton
 2.4.14
2.6 2004-12-16[57] New widgets:
  • GtkIconView
  • GtkAboutDialog
  • GtkCellView

The last to support Windows 98/Me

2.6.10
2.8 2005-08-13[58] Most widgets are rendered by Cairo 2.8.20
2.10 2006-07-03[59] New widgets:
  • GtkStatusIcon
  • GtkAssistant
  • GtkLinkButton
  • GtkRecentChooser

Print support: GtkPrintOperation

2.10.14
2.12 2007-09-14[60] GtkBuilder 2.12.12
2.14 2008-09-04[61] JPEG 2000 load support 2.14.7
2.16 2009-03-13[62] New widget: GtkOrientable

Caps Lock warning in password entry

Improvements on GtkScale, GtkStatusIcon, GtkFileChooser

2.16.6
2.18 2009-09-23[63] New widget: GtkInfoBar

Improvement on file chooser, printing

To remove much of the necessary IPC between the X11 application and the X11 server, GDK is rewritten (mainly by Alexander Larsson) to use "client-side windows", i.e., the GdkWindow, which every widget must have, belongs now to the client

2.18.9
2.20 2010-03-23[64] New widgets:
  • GtkSpinner
  • GtkToolPalette
  • GtkOffscreenWindow

Improvement on file chooser, keyboard handling, GDK

Introspection data is now included in GTK

2.20.1
2.22 2010-09-23[65] GdkPixbuf moved to separate module

Most GDK drawing are based on Cairo

Many internal data are now private and can be sealed in preparation to GTK 3

2.22.1
2.24 2011-01-30[66] New widget: GtkComboBoxText which had previously been a custom widget shipped with Gtkmm

The CUPS print backend can send print jobs as PDF

GtkBuilder has gained support for text tags and menu toolbuttons and many introspection annotation fixes were added

Migrating from GTK+ 2.x to GTK+ 3

2.24.33
(2020-12-21)[67]
3.0 2011-02-10[68] Development and design of the GTK 3 release of the toolkit started in February 2009 during the GTK Theming Hackfest held in Dublin[69]
  • The first draft of the development roadmap was released on 9 April 2009[70]

Completed mostly Project Ridley

  • the attempt to consolidate several libraries that were external to GTK+
  • including libgnome, libgnomeui, libgnomeprint22, libgnomeprintui22, libglade, libgnomecanvas, libegg, libeel, gtkglext, and libsexy[71]

All the rendering is done using Cairo

GDK became more X11 agnostic

XInput2, theme API is based on Cascading Style Sheets (CSS), worsening the achievable performance for 60 Hz frame rates

3.0.12
3.2 2011-09-25[72] New widgets:
  • GtkLockButton
  • GtkOverlay

New Font Chooser dialog

New experimental backends:

3.2.4
3.4 2012-03-26[73] Menu support in GtkApplication

A new color chooser

Added support for touch devices

Added support for smooth scrolling

GtkScrolledWindow will do kinetic scrolling with touch devices

macOS support is improved

This is the first version of GTK 3 that works well on Windows

The Wayland backend is updated to the current Wayland version

Spin buttons have received a new look

Accessibility: the treeview accessible support is rewritten

More complete CSS theming support

3.4.4
3.6 2012-09-24[74] New widgets:
  • GtkSearchEntry
  • GtkMenuButton
  • GtkLevelBar

Vertical spin buttons

CSS animations, blur shadows

Support for cross-fading and transitions in themes

3.6.5
3.8 2013-03-25[75] Wayland 1.0 stable support

Support for the broadwayd server

Improved theming

Better geometry management

Touch improvements

Support with the window manager for the frame synchronization protocol

GdkFrameClock added[76]

3.8.9
3.10 2013-09-23[77] New widgets:
  • GtkHeaderBar
  • GtkPlacesSidebar
  • GtkStack
  • GtkStackSwitcher
  • GtkRevealer
  • GtkSearchBar
  • GtkListBox

Support for Wayland 1.2

  • maximization
  • animated cursors
  • multiple monitors
  • settings
  • custom surfaces
  • frame synchronization

Added:

  • client-side decorations
  • scaled output support on high-dpi screens
  • fine-adjustment mode for scrolling

Removed:

  • support for the Motif DND protocol
  • support for multiple screens per display
  • gdk_window_get_display
  • gtk_widget_push_composite_child

Tear-off menu-items, plus many GTK settings

The modern GTK drawing model

3.10.9
3.12 2014-03-25[78] Client-side decorations[79]

Support for Wayland 1.5

New widget: GtkPopover (an alternative to menus and dialogs)

3.12.2
3.14 2014-09-22[80] GtkInspector (a copy of gtkparasite) introduced[81][82]

Improved support for gestures/multi-touch merged[83][84]

Deprecated:[85]

  • GtkMisc
  • GtkAlignment
  • GtkArrow
  • GdkColor
  • Style regions
  • support for .icon files
  • gdk_window_flush
  • drawing outside of begin/end paint

Most widgets converted to use gestures internally

Wayland supports GNOME Shell classic mode[86]

3.14.15
3.16 2015-03-22[87] GDK supports rendering windows using OpenGL for X11 and Wayland using libepoxy

New widgets:

  • GtkGLArea
  • GtkStackSidebar
  • GtkModelButton
  • GtkPopoverMenu

Scrolling overhauled (scrollbar hidden by default[88])

Experimental Mir backend[89]

3.16.7
3.18 2015-09-23[90] Add CSS node infrastructure

More filechooser design refresh and better filechooser search

Dropped Windows XP support

Model support for list and flow box

Kinetic touchpad scrolling

Touchpad gestures (Wayland)

gtk-builder-tool utility

Output-only windows

3.18.9
3.20 2016-03-21[91] Further Integration of CSS nodes[92]

Move drag and drop down to GDK

New widget: GtkShortcutsWindow (shows keyboard shortcuts and gestures of an application)

3.20.10
3.22 2016-09-21[93] Last 3.x release[27]

Wayland tablet support is merged,[94] support for graphics tablets is considered feature complete[95]

GTK 3.22 shall be as rock-stable (and hence "boring") as GTK 2[32][96][97]

for 3+ years
3.22.29
3.24 2018-09-03[98] 3.22 was supposed to be the last version of GTK 3 series
  • 3.24 was mainly released to ease migrating from GTK+ 3.x to GTK+ 4

Dependency bumps – require:

  • libepoxy 1.4
  • pango 1.41

New font chooser features:

  • allow setting OpenType font features
  • show examples for OpenType font features
  • allow selecting OpenType font variations
  • support levels of details for selection

New Emoji features:

  • support a completion popup for Emoji
  • drop Ctrl-Shift-e shortcut

Other new APIs: gdk_window_move_to_rect

Wayland: use anonymous shared memory on FreeBSD

Backported event controllers from GTK 4:

  • GtkEventControllerScroll
  • GtkEventControllerMotion
  • GtkEventControllerKey
  • GtkGestureStylus

Deprecate a few APIs that are gone in GTK 4:

  • focus chains in GtkContainer
  • stepper sensitivity in GtkRange
 3.23.0
3.23.1
3.23.2
3.23.3
3.24.0
...3.24.5
3.24.14
...

3.24.29

3.90 2017-03-31[99] GTK Scene Graph Kit (GSK) merged[6]

Remove any API marked as deprecated

Heavy development

A new Vulkan-renderer augments the old Cairo-renderer[100]

3.89.1

3.89.2
3.89.4
3.89.5
3.90

3.92 2017-10-18[101][102] As GNOME 3.26 was released already on September 13, 2017,[103] it was not based on GTK 3.92.

GNU autotools was replaced with Meson.

3.91.0

3.91.1
3.91.2
3.92.1

3.94 2018-06-26[104] 3.93
  • GdkScreen, GdkVisual removed
  • GdkDeviceManager replaced by GdkSeat
  • Clipboard handling is moved from GTK to GDK
  • GdkEvent is converted to an opaque GObject
  • the GL renderer in GSK is substantially completed, and is now on par with the Vulkan renderer
  • the use of GdkPixbuf in APIs is reduced
    • and the GskTexture object is moved to GDK as GdkTexture, to take its place
  • the Wayland backend now implements the KDE server-side decoration protocol
  • Broadway is ported to GSK.

GdkWindow renamed to GdkSurface

New abstraction for drawable content: GdkPaintable

There is support for displaying media with:

  • GtkVideo
  • GtkMediaFile
  • GtkMediaStream
  • GtkMediaControls
 3.93
3.94.0
3.96 2019-05-07[105] The gtk4-builder-tool simplify command has gained a --3to4 option to convert GTK3 ui files to GTK4; though with AMTK menus, toolbars or other objects like GtkShortcutsWindow are created programmatically (not with a *.ui file), but with convenient APIs.[106]

GtkWidget can now use a GtkLayoutManager for size allocation

  • layout managers can optionally use layout children holding layout properties
  • GtkBinLayout, GtkBoxLayout, GtkGridLayout, GtkFixedLayout and GtkCustomLayout are currently available
  • more layout manager implementations will appear in the future

Focus handling has been rewritten, and focus-change event generation has been unified with crossing events

Events have been simplified and are just used for input:

  • expose events have been replaced by a GdkSurface::render signal
  • configure events have been replaced by a GdkSurface::size-changed signal
  • map events have been replaced by a GdkSurface::mapped property
  • gdk_event_handler_set has been replaced by a GdkSurface::event signal
  • key events no longer contain a string
  • events on unmapped widgets are ignored
 3.96.0
3.98 2020-02-10[105]
  • Performance improvements
  • Drag and drop refactoring
  • Moving GDK towards Wayland
  • Removals
    • GtkMenu, GtkToolbar and similar classes have been replaced by GMenu.
  • Additions
    • Emoji chooser
    • Text widgets now have undo stacks
    • A new layout manager[107]
 3.98.5
3.99.0 2020-07-31[108]
  • Introduced successor to Accessibility Toolkit (ATK).[109] The new approach will implement WAI-ARIA (World Wide Web Consortium (W3C) Accessibility Initiative – Accessible Rich Internet Applications).
  • Updated headers to use standard C types instead of GLib types
  • New widgets
  • Fixes and improvements[108]
 3.99.4
4.0 2020-12-16[110] 4.0.2
4.2 2021-03-30[111]
4.4 2021-08-23[112]
4.6 2021-12-30[113]
4.8 2022-09-06[114]
4.10 2023-03-04[115]


See also

References

  1. ↑ "The GTK Open Source Project on Open Hub: Languages Page". https://www.openhub.net/p/gtk/analyses/latest/languages_summary. 
  2. ↑ "A brief description on how GTK was born.". https://www.gtk.org/about/. 
  3. ↑ 3.0 3.1 Bassi, Emmanuele (2019-02-06). "Project rename to "GTK"". GNOME mailinglist. https://mail.gnome.org/archives/gtk-devel-list/2019-February/msg00000.html. 
  4. ↑ The GTK+ Team. "GTK+ Features". https://www.gtk.org/features.php. 
  5. ↑ "Documentation". https://www.x.org/wiki/Documentation/. 
  6. ↑ 6.0 6.1 "Projects/GTK/Roadmap - GNOME Wiki!". https://wiki.gnome.org/action/show/Projects/GTK/Roadmap?action=show&redirect=Projects%2FGTK%2B%2FRoadmap. 
  7. ↑ "GTK 4.0 – GTK Development Blog" (in en-US). 16 December 2020. https://blog.gtk.org/2020/12/16/gtk-4-0/. 
  8. ↑ "Robin Rowe / GTK1 · GitLab". https://gitlab.com/robinrowe/gtk1. 
  9. ↑ "GTK+ 3 Reference Manual". https://developer.gnome.org/gtk3/stable/. 
  10. ↑ "Using GTK+ with Broadway". GNOME. https://developer.gnome.org/gtk3/stable/gtk-broadway.html. 
  11. ↑ "Broadway - GitHub symbiose/symbiose Wiki". https://github.com/symbiose/symbiose/wiki/Broadway. 
  12. ↑ "GTK+ to Use Cairo Vector Engine". 5 February 2005. http://developers.slashdot.org/article.pl?sid=05/02/04/2021236. 
  13. ↑ "Gtk: Migrating from GTK 2.x to GTK 3" (in en). https://docs.gtk.org/gtk3/migrating-2to3.html. "All drawing in GTK 3 is done via Cairo." 
  14. ↑ "Matthias Clasen DevConf.cz 2018 talk about GTK+ 4". 2018-01-26. https://mclasen.fedorapeople.org/gtk4-devconf2018.pdf. 
  15. ↑ "Introducing GtkInspector". 2014-05-15. http://blogs.gnome.org/mclasen/2014/05/15/introducing-gtkinspector/. 
  16. ↑ "Another GtkInspector update". 2014-07-11. http://blogs.gnome.org/mclasen/2014/07/11/another-gtkinspector-update/. 
  17. ↑ "Debian -- Package Search Results -- gazpacho". https://packages.debian.org/search?keywords=gazpacho. 
  18. ↑ "Nothing-personal - A development site for Crow Designer, GuiLoader and Rally - Google Project Hosting". http://nothing-personal.googlecode.com/. 
  19. ↑ The GTK+ Team. "GTK+ Language Bindings". https://www.gtk.org/language-bindings.php. 
  20. ↑ 20.0 20.1 "Gtk# is a Mono/.NET binding to the cross platform Gtk+ GUI toolkit and the foundation of most GUI apps built with Mono: mono/gtk-sharp". 16 November 2019. https://github.com/mono/gtk-sharp. 
  21. ↑ "Download Gtk#". The GTK+ Project. http://download.xamarin.com/GTKforWindows/Windows/gtk-sharp-2.12.22.msi. 
  22. ↑ "'Bansheegeddon' may see Banshee, Mono dropped from Ubuntu default". http://www.itworld.com/article/2734148/it-management/-bansheegeddon--may-see-banshee--mono-dropped-from-ubuntu-default.html. 
  23. ↑ "GNOME Quick SWOT Analysis". https://wiki.gnome.org/Engagement/SWOT. 
  24. ↑ "GTK+ and GNOME Mailing Lists". The GNOME Project. http://mail.gnome.org. 
  25. ↑ "About". GNOME Users And Developers European Conference (GUADEC). http://guadec.expectnation.com/public/content/about. 
  26. ↑ "GNOME Languages". Black Duck Software. http://www.ohloh.net/p/gnome/analyses/latest/languages_summary. 
  27. ↑ 27.0 27.1 "Versioning and long term stability promise in GTK". GTK development blog. 2016-09-01. https://blog.gtk.org/2016/09/01/versioning-and-long-term-stability-promise-in-gtk/. 
  28. ↑ "GTK+ 3.24 To Deliver Some New Features While Waiting For GTK4". https://www.phoronix.com/scan.php?page=news_item&px=GTK-3.24-Coming-This-Fall. 
  29. ↑ "Build system change GTK's master branch". https://mail.gnome.org/archives/gtk-devel-list/2017-August/msg00028.html. 
  30. ↑ "How Does One Create A Gtk+ Application? – Morten Welinder". 23 June 2014. http://blogs.gnome.org/mortenw/2014/06/23/how-does-one-create-a-gtk-application/. 
  31. ↑ mclasen (20 November 2015). "A GTK+ update". https://blogs.gnome.org/mclasen/2015/11/20/a-gtk-update/. 
  32. ↑ 32.0 32.1 "GUADEC2013: Benjamin Otte talks about GTK+". GUADEC. http://videos.guadec.org/2013/GTK%20to%20infinity%20and%20beyond/. 
  33. ↑ Larabel, Michael (2014-01-12). "The Biggest Problem With GTK & What Qt Does Good". Phoronix. https://www.phoronix.com/scan.php?page=news_item&px=MTU2ODM. 
  34. ↑ Hong Jen Yee (2013-03-26). "PCManFM Qt 0.1.0 released". http://blog.lxde.org/?p=990. 
  35. ↑ "Audacious - An Advanced Audio Player". https://audacious-media-player.org/news/32-audacious-3-6-released. 
  36. ↑ Lindgren, John (2014-05-06). "Ugly window decorations and how to fix them (GTK 3.12)". http://redmine.audacious-media-player.org/boards/1/topics/1135. 
  37. ↑ Gerald Combs (2013-10-15). "We're switching to Qt". https://blog.wireshark.org/2013/10/switching-to-qt/. 
  38. ↑ "GTK+". WxWidgets Compared To Other Toolkits. http://www.wxwidgets.org/wiki/index.php/WxWidgets_Compared_To_Other_Toolkits#GTK.2B. 
  39. ↑ "GTK+ TTY Port". Slashdot. 26 August 2003. http://slashdot.org/article.pl?sid=03/08/26/2042206. 
  40. ↑ "LinuxWorld - Where did Spencer Kimball and Peter Mattis go?". http://www.linuxworld.com/linuxworld/lw-1999-01/lw-01-gimp.html. 
  41. ↑ "What is the + in GTK+?". 2011. http://developer.gnome.org/gtk-faq/stable/x90.html. 
  42. ↑ "Rename some references to GTK+ (d080be3e) · Commits · GNOME / gtk". 4 February 2019. https://gitlab.gnome.org/GNOME/gtk/commit/d080be3e5091c98d5171063a95d55c01170881f3. 
  43. ↑ "Projects/GTK/OSX - GNOME Wiki!". https://wiki.gnome.org/action/show/Projects/GTK/OSX?action=show&redirect=Projects%2FGTK%2B%2FOSX. 
  44. ↑ "GTK Download: Mac OS X". The GTK Team. https://www.gtk.org/docs/installations/macos/. 
  45. ↑ "GTK Download: Windows". The GTK Team. https://www.gtk.org/docs/installations/windows/. 
  46. ↑ "GTK+ for Windows Runtime Environment". 15 September 2017. https://sourceforge.net/projects/gtk-win/. 
  47. ↑ "GTK+". http://www.tarnyko.net/dl/gtk.htm. 
  48. ↑ "GTK+ for Windows Runtime Environment Installer (fork from http://gtk-win.sourceforge.net): tschoonj/GTK-for-Windows-Runtime-Environment-Installer". 19 November 2020. https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer. 
  49. ↑ "HP OpenVMS systems - GTK+". http://h41379.www4.hpe.com/openvms/products/ips/gtk.html. 
  50. ↑ "HP OpenVMS systems - GTK+". http://h41379.www4.hpe.com/openvms/products/ips/gtk_down.html. 
  51. ↑ https://mclasen.fedorapeople.org/gtk4-devconf2018.pdf [bare URL PDF]
  52. ↑ Amundson, Shawn T. (13 April 1998). "ANNOUNCE: GTK+ 1.0.0 Released!". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  53. ↑ Amundson, Shawn T. (25 February 1999). "ANNOUNCE: GTK+ and GLib 1.2.0 Released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  54. ↑ Taylor, Owen (11 March 2002). "GTK+-2.0.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  55. ↑ Taylor, Owen (22 December 2002). "GTK+-2.2.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  56. ↑ Taylor, Owen (16 March 2004). "GTK+-2.4.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  57. ↑ Clasen, Matthias (16 December 2004). "GTK+-2.6.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  58. ↑ Clasen, Matthias (13 August 2005). "GTK+ 2.8.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  59. ↑ Clasen, Matthias (3 July 2006). "GTK+ 2.10 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  60. ↑ Clasen, Matthias (14 September 2007). "GTK+ 2.12 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  61. ↑ Clasen, Matthias (4 September 2008). "GTK+ 2.14.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  62. ↑ Clasen, Matthias (13 March 2009). "GTK+ 2.16.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  63. ↑ Clasen, Matthias (23 September 2009). "GTK+ 2.18.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  64. ↑ Clasen, Matthias (23 March 2010). "GTK+ 2.20.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  65. ↑ Clasen, Matthias (23 September 2010). "GTK+ 2.22.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  66. ↑ Clasen, Matthias (20 January 2011). "GTK+ 2.24.0". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  67. ↑ "Tags · GNOME / gtk · GitLab" (in en). 2020-12-21. https://gitlab.gnome.org/GNOME/gtk/-/tags?sort=updated_desc&search=2.24. 
  68. ↑ Clasen, Matthias (10 February 2011). "GTK+ 3.0.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  69. ↑ "Gtk+ 3.0 Theming API Hackfest". http://aruiz.typepad.com/siliconisland/2009/02/gtk-30-theming.html. 
  70. ↑ "Gtk+ 3 roadmap draft". http://testbit.eu/~timj/blogstuff/GtkRoadmap3Draft2.html. 
  71. ↑ "Attic/ProjectRidley - GNOME Wiki!". https://wiki.gnome.org/Attic/ProjectRidley. 
  72. ↑ Clasen, Matthias (25 September 2011). "GTK+ 3.2.0". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  73. ↑ Clasen, Matthias (26 March 2012). "GTK+ 3.4.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  74. ↑ Clasen, Matthias (24 September 2012). "GTK+ 3.6.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  75. ↑ Clasen, Matthias (25 March 2013). "GTK+ 3.8.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  76. ↑ "Frame clock: GDK 3 Reference Manual". https://developer.gnome.org/gdk3/stable/GdkFrameClock.html. 
  77. ↑ Clasen, Matthias (23 September 2013). "GTK+ 3.10.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  78. ↑ Clasen, Matthias (25 March 2014). "GTK+ 3.12 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  79. ↑ "Client-side decorations in themes | Goings on". 5 December 2013. https://blogs.gnome.org/mclasen/2013/12/05/client-side-decorations-in-themes/. 
  80. ↑ Clasen, Matthias (22 September 2014). "GTK+ 3.14.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  81. ↑ Matthias Clasen (2014-05-15). "GtkInspector Author's blog entry". http://blogs.gnome.org/mclasen/2014/05/15/introducing-gtkinspector/. 
  82. ↑ "GtkInspector in GNOME wiki". 2014-05-15. https://wiki.gnome.org/Projects/GTK%2B/Inspector. 
  83. ↑ "Merging gestures into 3.14". 2014-05-23. https://www.phoronix.com/scan.php?page=news_item&px=MTY5ODc. 
  84. ↑ "RFC: gestures". 2014-03-04. https://mail.gnome.org/archives/gtk-devel-list/2014-March/msg00018.html. 
  85. ↑ "gtk+ 3.13.2". 2014-05-27. https://mail.gnome.org/archives/ftp-release-list/2014-May/msg00119.html. 
  86. ↑ "gtk+ 3.13.3". 2014-06-24. https://mail.gnome.org/archives/ftp-release-list/2014-June/msg00075.html. 
  87. ↑ Clasen, Matthias (22 March 2015). "GTK+ 3.16.0 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  88. ↑ online, heise (25 March 2015). "Linux-Desktop: Neues Gnome zeigt Nachrichten oben". http://www.heise.de/open/meldung/Linux-Desktop-Neues-Gnome-zeigt-Nachrichten-oben-2584020.html. 
  89. ↑ "GTK+ 3.16.0 released". https://mail.gnome.org/archives/gnome-announce-list/2015-March/msg00029.html. 
  90. ↑ Nestor, Marius (Sep 24, 2015). "GTK+ 3.18.0 Officially Released as Part of the GNOME 3.18 Desktop Environment". https://news.softpedia.com/news/gtk-plus-3-18-0-officially-released-as-part-of-the-gnome-3-18-desktop-environment-492591.shtml. 
  91. ↑ Clasen, Matthias (21 March 2016). "GTK+ 3.20". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  92. ↑ "GTK+ 3.20 – Style Classes and Element Names". 2015-11-20. https://wiki.gnome.org/Projects/GTK%2B/StyleClasses. 
  93. ↑ Clasen, Matthias (21 September 2016). "GTK+ 3.22 released". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  94. ↑ "GTK+ Wayland tablet support is merged – Carlos Garnacho". https://blogs.gnome.org/carlosg/2016/04/06/gtk-wayland-tablet-support-is-merged/. 
  95. ↑ "hutterer input". https://www.x.org/wiki/Events/XDC2016/Program/hutterer_input/. 
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  97. ↑ 97.0 97.1 "Gtk 5.0 will not be stable until Gtk 5.6". 2016-06-14. https://blogs.gnome.org/desrt/2016/06/14/gtk-5-0-is-not-gtk-5/. 
  98. ↑ Clasen, Matthias (3 September 2018). "gtk+ 3.24.0". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  99. ↑ Clasen, Matthias (31 March 2017). "gtk+ 3.90.0". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
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  101. ↑ Clasen, Matthias (18 October 2017). "gtk+ 3.92.1". GNOME Mail Services (Mailing list). Retrieved 20 May 2019.
  102. ↑ Clasen, Matthias (23 October 2017). "GTK+ 3.92". https://blog.gtk.org/2017/10/23/gtk-3-92/. 
  103. ↑ "GNOME 3.26 Released". 2017-09-13. https://www.gnome.org/news/2017/09/gnome-3-26-released/. 
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  106. ↑ "Introducing amtk". https://developer.gnome.org/amtk/unstable/amtk-intro.html. 
  107. ↑ Clasen, Matthias (2020-02-13). "GTK 3.98" (in en-US). https://blog.gtk.org/2020/02/13/gtk-3-98/. 
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  109. ↑ "Emmanuele Bassi / guadec-2020". https://gitlab.gnome.org/ebassi/guadec-2020. 
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  111. ↑ Clasen, Matthias (2021-03-30). "gtk 4.2.0". GNOME Mail Services (Mailing list). Retrieved 2021-03-30.
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Bibliography

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