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GTK

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   Free and open-source cross-platform widget toolkit for creating
   graphical user interfaces
   For other uses, see GTK (disambiguation).

   CAPTION: 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 release   April 14, 1998; 24 years ago (1998-04-14)
   Stable release
   4.6.6 / July 2, 2022; 5 months ago (2022-07-02)

   Preview release

   4.7.1 / July 13, 2022; 5 months ago (2022-07-13)

   Repository

     * gitlab.gnome.org/GNOME/gtk Edit this at Wikidata

   Written in C, CSS^[1]
   Operating system Linux, Unix-like, macOS, Windows
   Type Widget toolkit
   License LGPLv2.1+
   Website gtk.org

   GTK (formerly GIMP ToolKit and GTK+)^[2] is a free and open-source
   cross-platform widget toolkit for creating graphical user interfaces
   (GUIs).^[3] 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.^[4]

   The GTK team releases new versions on a regular basis.^[5] GTK 4 and
   GTK 3 are maintained, while GTK 2 is end-of-life.^[6]

   [ ]

Contents

     * 1 Software architecture
          + 1.1 GTK Drawing Kit (GDK)
          + 1.2 GTK Scene Graph Kit (GSK)
          + 1.3 GtkInspector
          + 1.4 GUI designers
               o 1.4.1 GtkBuilder
          + 1.5 Language bindings
               o 1.5.1 Gtk#
     * 2 Development
          + 2.1 Build automation
     * 3 Criticism
     * 4 Use
          + 4.1 Applications
          + 4.2 Desktop environments
               o 4.2.1 Current
               o 4.2.2 Inactive
               o 4.2.3 Miscellaneous
          + 4.3 Window managers
          + 4.4 GtkSourceView
          + 4.5 GtkSpell
     * 5 Example
     * 6 History
          + 6.1 Linux
          + 6.2 macOS
          + 6.3 Windows
          + 6.4 OpenVMS
          + 6.5 GTK 4
          + 6.6 Releases
     * 7 See also
     * 8 References
     * 9 Bibliography
     * 10 External links

Software architecture[edit]

   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.^[7] 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.^[8]^[9]

   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.^[10] Since GTK version 3.0, all rendering is done using
   Cairo.^[11]

   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.^[12] On 6 February 2019 it
   was announced that GTK 4 will drop the "+" from the project's name.^[2]

  GTK Drawing Kit (GDK)[edit]

   Main article: GDK

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

   GDK is found in the /gdk directory.

  GTK Scene Graph Kit (GSK)[edit]

   Main article: 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.

   GSK is found in the /gsk directory.

  GtkInspector[edit]

   GtkInspector was introduced with version 3.14.^[13]^[14] GtkInspector
   can only be invoked after installing the development package
   libgtk-3-dev/gtk+-devel^[permanent dead link].

  GUI designers[edit]

   There are several GUI designers for GTK. The following projects are
   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^[15]
     * Crow Designer, relies on its own GuiXml format and GuiLoader
       library.^[16]
     * 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[edit]

   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[edit]

   Main article: List of language bindings for GTK

   Language bindings are available for using GTK from languages other than
   C, including C++, Genie, JavaScript, Perl, Python, Vala, and
   others.^[17]

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

    Gtk#[edit]

   CAPTION: Gtk#

   Gtk Sharp Logo.png
    Developer(s)   Xamarin
   Initial release March 12, 2004; 18 years ago (2004-03-12)

   Stable release

   2.12.41^[18] / September 22, 2016; 6 years ago (2016-09-22)

   Preview release

   2.99.3 (for GTK3)^[18] / June 6, 2014; 8 years ago (2014-06-06)

   Repository

     * gitlab.gnome.org/GNOME/gtk Edit this at Wikidata

   Written in C#, XML, Perl, C
   Operating system Windows, macOS, Linux
   Type Widget toolkit
   License GNU Lesser General Public License
   Website mono-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.

   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.^[19]

   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.

   As of September 2020^[update], 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.^[20]

Development[edit]

   GTK is mainly developed by The GNOME Project, which also develops the
   GNOME Development Platform and the GNOME Desktop Environment.^[21]

   GTK development is loosely managed. Discussion chiefly occurs on
   several public mailing lists.^[22] 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.^[23] GNOME
   incorporates standards and programs from freedesktop.org to better
   interoperate with other desktops.

   GTK is mainly written in C.^[24] Many language bindings are available.

   On 1 September 2016 a post on the GTK development blog denoted, among
   other things, the future numbering scheme of GTK.^[25] 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.^[26] The development of GTK 4 used version names 3.90, 3.92, etc.
   until the first GTK 4.0 stable release was launched in December
   2020.^[27] Despite the first stable GTK 4 release, some applications
   using GTK still rely on GTK 2. For example, as of January 2022, GIMP is
   still being ported to GTK 3.^[28]

  Build automation[edit]

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

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

Criticism[edit]

   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[edit]

   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[edit]

   Main pages: List of GTK applications and Category:Software that uses
   GTK

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

     * Ardour, a digital audio workstation (DAW)
     * Deluge, a Bit Torrent client
     * Foliate, an ebook reader
     * GIMP, a raster graphics editor
     * GNOME Builder, an integrated development environment (IDE)
     * GNOME Core Applications, a collection of applications as a standard
       bundle of the GNOME desktop environment
     * GNOME Evolution, a personal information manager
     * HandBrake, digital video transcoder
     * Inkscape, a vector graphics editor
     * LibreOffice, an office suite
     * Lutris, a game manager
     * Mozilla Firefox, a web browser
     * Mozilla Thunderbird, a personal information manager
     * Pitivi, a video editor
     * PCSX-Reloaded, a video game console emulator
     * Remmina, a remote desktop client
     * Transmission, a Bit Torrent client

  Desktop environments[edit]

   Main page: Desktop environments based on GTK

   Several desktop environments utilize GTK as the widget toolkit.

    Current[edit]

     * 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[edit]

     * Access Linux Platform (successor of the Palm OS PDA platform)
     * Consort, the GNOME 3.4 Fallback Mode - fork from SolusOS
     * GPE, the GPE Palmtop Environment
     * ROX Desktop, a lightweight desktop, with features from the GUI of
       RISC OS

    Miscellaneous[edit]

   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[edit]

   The following window managers use GTK:

     * Aewm
     * AfterStep
     * Amaterus
     * Consortium
     * IceWM
     * Marco
     * Metacity
     * Muffin
     * Mutter
     * Sawfish
     * Wmg
     * Xfwm

  GtkSourceView[edit]

   Main article: 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.

  GtkSpell[edit]

   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.
     * gtkspell.sourceforge.net

Example[edit]

   Documentation is available here:
     * developer.gnome.org/gtk4/stable/

   The following code presents a graphical GTK hello-world program in the
   C programming language. This program has a window with the title
   "Hello, world!" and a label with similar text.

// helloworld.c
#include <gtk/gtk.h>

/* Callback that will be called when the application is activated */
static void
activate_callback(GApplication *app, gpointer user_data)
{
    GtkWidget *window;
    GtkWidget *label;

    /* Create the main, top level window */
    window = gtk_window_new();

    /* Give it the title */
    gtk_window_set_title(GTK_WINDOW(window), "Hello, world!");

    /* Set the window's default size */
    gtk_window_set_default_size(GTK_WINDOW(window), 200, 100);

    /* Assign the variable "label" to a new GTK label,
     * with the text "Hello, world!" */
    label = gtk_label_new("Hello, world!");

    /* Plot the label onto the main window */
    gtk_window_set_child(GTK_WINDOW(window), label);

    /* Make the application aware of the window.
     * The application process will continue to run until all
     * windows are closed */
    gtk_application_add_window(GTK_APPLICATION(app), GTK_WINDOW(window));

    /* Make sure that everything, window and label, are visible */
    gtk_widget_show(window);
}

int main (int argc, char *argv[])
{
    /* Create our test application */
    GtkApplication *application = gtk_application_new("org.wikipedia.gtktest", 0
);

    /* Connect our handler to the "activate" callback, which will be called
     * when the application is activated by the user, e.g. on first start */
    g_signal_connect(application, "activate", G_CALLBACK(activate_callback), NUL
L);

    /* Run the application and return its status */
    return g_application_run(G_APPLICATION(application), argc, argv);
}

   Needs installing the libraries first in Debian or derivatives: $ sudo
   apt-get install libgtk-4-dev

   Using pkg-config in a Unix shell, this code can be compiled with the
   following command: $ cc -Wall $(pkg-config --cflags --libs gtk4)
   helloworld.c -o helloworld

   Invoke the program: $ ./helloworld

History[edit]

  Linux[edit]

   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[edit]

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

  Windows[edit]

     * 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[edit]

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

  GTK 4[edit]

   One of the cardinal novelties implemented during the GTK 4 development
   cycle (i.e. GTK 3.92, etc.) has been the removal of customization
   option for the user side (like individual keyboard shortcuts that could
   be set in GTK+ 2), 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 2018-Jan-26 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[edit]

   Legend:
   Old version
   Older version, still maintained
   Latest version
   Latest preview version
   Future release
   Release series Initial release Major enhancements Latest minor version
   Old version, no longer maintained: 1.0 1998-04-13^[52] First stable
   version 1.0.6
   Old version, no longer maintained: 1.2 1999-02-25^[53] New widgets:
     * GtkFontSelector
     * GtkPacker
     * GtkItemFactory
     * GtkCTree
     * GtkInvisible
     * GtkCalendar
     * GtkLayout
     * GtkPlug
     * GtkSocket

   1.2.10
   Old version, no longer maintained: 2.0 2002-03-11^[54] GObject

   Overall support for UTF-8
   2.0.9
   Old version, no longer maintained: 2.2 2002-12-22^[55] Multihead
   support 2.2.4
   Old version, no longer maintained: 2.4 2004-03-16^[56] New widgets:
     * GtkFileChooser
     * GtkComboBox
     * GtkComboBoxEntry
     * GtkExpander
     * GtkFontButton
     * GtkColorButton

   2.4.14
   Old version, no longer maintained: 2.6 2004-12-16^[57] New widgets:
     * GtkIconView
     * GtkAboutDialog
     * GtkCellView

   The last to support Windows 98/Me
   2.6.10
   Old version, no longer maintained: 2.8 2005-08-13^[58] Most widgets are
   rendered by Cairo 2.8.20
   Old version, no longer maintained: 2.10 2006-07-03^[59] New widgets:
     * GtkStatusIcon
     * GtkAssistant
     * GtkLinkButton
     * GtkRecentChooser

   Print support: GtkPrintOperation
   2.10.14
   Old version, no longer maintained: 2.12 2007-09-14^[60] GtkBuilder
   2.12.12
   Old version, no longer maintained: 2.14 2008-09-04^[61] JPEG 2000 load
   support 2.14.7
   Old version, no longer maintained: 2.16 2009-03-13^[62] New widget:
   GtkOrientable

   Caps Lock warning in password entry

   Improvements on GtkScale, GtkStatusIcon, GtkFileChooser
   2.16.6
   Old version, no longer maintained: 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
   Old version, no longer maintained: 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
   Old version, no longer maintained: 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
   Old version, no longer maintained: 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
   2.24.32
   (2018-01-08)
   Old version, no longer maintained: 3.0 2011-02-10^[67] Development and
   design of the GTK 3 release of the toolkit started in February 2009
   during the GTK Theming Hackfest held in Dublin^[68]
     * The first draft of the development roadmap was released on 9 April
       2009^[69]

   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^[70]

   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
   Old version, no longer maintained: 3.2 2011-09-25^[71] New widgets:
     * GtkLockButton
     * GtkOverlay

   New Font Chooser dialog

   New experimental backends:
     * Wayland
     * HTML5 (named "Broadway")

   3.2.4
   Old version, no longer maintained: 3.4 2012-03-26^[72] 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
   Old version, no longer maintained: 3.6 2012-09-24^[73] New widgets:
     * GtkSearchEntry
     * GtkMenuButton
     * GtkLevelBar

   Vertical spin buttons

   CSS animations, blur shadows

   Support for cross-fading and transitions in themes
   3.6.5
   Old version, no longer maintained: 3.8 2013-03-25^[74] 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^[75]
   3.8.9
   Old version, no longer maintained: 3.10 2013-09-23^[76] 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
   Old version, no longer maintained: 3.12 2014-03-25^[77] Client-side
   decorations^[78]

   Support for Wayland 1.5

   New widget: GtkPopover (an alternative to menus and dialogs)
   3.12.2
   Old version, no longer maintained: 3.14 2014-09-22^[79] GtkInspector (a
   copy of gtkparasite) introduced^[80]^[81]

   Improved support for gestures/multi-touch merged^[82]^[83]

   Deprecated:^[84]
     * 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^[85]
   3.14.15
   Old version, no longer maintained: 3.16 2015-03-22^[86] GDK supports
   rendering windows using OpenGL for X11 and Wayland using libepoxy

   New widgets:
     * GtkGLArea
     * GtkStackSidebar
     * GtkModelButton
     * GtkPopoverMenu

   Scrolling overhauled (scrollbar hidden by default^[87])

   Experimental Mir backend^[88]
   3.16.7
   Old version, no longer maintained: 3.18 2015-09-23^[89] 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
   Old version, no longer maintained: 3.20 2016-03-21^[90] Further
   Integration of CSS nodes^[91]

   Move drag and drop down to GDK

   New widget: GtkShortcutsWindow (shows keyboard shortcuts and gestures
   of an application)
   3.20.10
   Old version, no longer maintained: 3.22 2016-09-21^[92] Last 3.x
   release^[25]

   Wayland tablet support is merged,^[93] support for graphics tablets is
   considered feature complete^[94]

   GTK 3.22 shall be as rock-stable (and hence "boring") as GTK
   2^[32]^[95]^[96]
   for 3+ years
   3.22.29
   Older version, yet still maintained: 3.24 2018-09-03^[97] 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
   Old version, no longer maintained: 3.90 2017-03-31^[98] GTK Scene Graph
   Kit (GSK) merged^[5]

   Remove any API marked as deprecated
     * before (2016-09-22) vs. after

   Heavy development
     * break API & ABI^[95]^[96]

   A new Vulkan-renderer augments the old Cairo-renderer^[99]
   3.89.1

   3.89.2
   3.89.4
   3.89.5
   3.90
   Old version, no longer maintained: 3.92 2017-10-18^[100]^[101] As GNOME
   3.26 was released already on September 13, 2017,^[102] 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
   Old version, no longer maintained: 3.94 2018-06-26^[103] 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
   Old version, no longer maintained: 3.96 2019-05-07^[104] 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.^[105]

   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
   Old version, no longer maintained: 3.98 2020-02-10^[104]
     * 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^[106]

   3.98.5
   Old version, no longer maintained: 3.99.0 2020-07-31^[107]
     * Introduced successor to Accessibility Toolkit (ATK).^[108] 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^[107]

   3.99.4
   Old version, no longer maintained: 4.0 2020-12-16^[109] 4.0.2
   Old version, no longer maintained: 4.2 2021-03-30^[110]
   Old version, no longer maintained: 4.4 2021-08-23^[111]
   Current stable version: 4.6 2021-12-30^[112]

See also[edit]

     * Free and open-source software portal

     * Client-Side Decoration
     * List of widget toolkits
     * GDK - the GIMP Drawing Kit lies between the xlib and the GTK
       library, handling basic rendering such as drawing primitives,
       raster graphics (bitmaps), cursors, fonts, as well as window events
       and drag-and-drop functionality
     * gtkmm - C++ bindings for GTK
     * Qt - cross platform framework and toolkit
     * Xojo - cross-platform development tool and framework
     * Enlightenment Foundation Libraries (EFL) - widget toolkit written
       for the Enlightenment window manager
     * FLTK - a light, cross-platform, non-native widget toolkit
     * FOX toolkit - a fast, open source, cross-platform widget toolkit
     * IUP - a multi-platform toolkit for building native graphical user
       interfaces
     * Ultimate++
     * Visual Component Library (VCL)
     * Vala - an object-oriented programming language with a self-hosting
       compiler that generates C code and uses the GObject system.
     * wxWidgets - a cross-platform GUI toolkit whose goal is to directly
       use each platform's native graphic API whenever possible.

References[edit]

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Bibliography[edit]

     *

   Krause, Andrew (23 April 2007), Foundations of GTK+ Development
   (1st ed.), Apress, ISBN 978-1-59059-793-4

     Wright, Peter (15 May 2000), Beginning GTK+ and GNOME (1st ed.), Peer
   Information, ISBN 978-1-86100-381-2

     Logan, Syd (6 September 2001), Gtk+ Programming in C (1st ed.),
   Prentice Hall, ISBN 978-0-13-014264-1

External links[edit]

   Wikimedia Commons has media related to GTK.

   The Wikibook X Window Programming has a page on the topic of: GTK+

     * Official website Edit this at Wikidata

     * v
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     * Richard M. Stallman

   Other topics

     * GNU/Linux naming controversy
     * Revolution OS
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     * Defective by Design

     * v
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     * e

   List of widget toolkits

   Low-level, platform-specific

   On AmigaOS

     * Intuition

   On Classic Mac OS/macOS

     * Macintosh Toolbox
     * Carbon

   On Windows

     * Windows API
     * UWP
          + WinRT

   On Unix,
   under X11

     * Xlib
     * XCB
     * X Toolkit Intrinsics

   On BeOS, Haiku

     * BeOS API

   Cross-platform

   CLI
     * OpenTK

    C
     * GDK
     * Simple DirectMedia Layer

   Java
     * JOGL
     * LWJGL

   On Android

   CLI
     * Xamarin.Android

   High-level, platform-specific

   On AmigaOS

     * BOOPSI
     * MUI
     * ReAction GUI
     * Zune

   On Classic Mac OS/macOS

     Object Pascal
     * MacApp

   Objective-C/Swift
     * Cocoa
     * Cocoa Touch

   C++
     * MacApp
     * PowerPlant
     * THINK C

          CLI
     * Xamarin.Mac
     * Xamarin.iOS

   On Windows

   CLI
     * Windows Forms
     * XAML
          + Windows Presentation Foundation
          + Windows UI Library
          + Silverlight
     * Microsoft XNA

   C++
     * MFC
     * Active Template Library
     * Windows Template Library
     * Object Windows Library

   Object Pascal
     * Visual Component Library

   On Unix,
   under X11

     * Athena (Xaw)
     * LessTif
     * Motif
     * OLIT
     * XForms

   On Android

     * Qt for Android

   High-level, cross-platform

   C

     * Enlightenment Foundation Libraries
     * GTK
     * IUP
     * XForms
     * XVT

   C++

     * Bedrock
     * CEGUI
     * Component Library for Cross Platform
     * FLTK
     * FOX toolkit
     * OpenGL User Interface Library
     * gtkmm
     * JUCE
     * Nana
     * Qt
     * Rogue Wave Views
     * TnFOX
     * U++
     * VCF
     * Wt
     * wxWidgets
     * Simple and Fast Multimedia Library

   Objective-C

     * GNUstep

   CLI

     * Gtk#
     * Tao Framework
          + OpenTK
     * UIML
     * MonoGame
     * Moonlight
     * Xamarin.Forms
     * XWT[1][2]

   Adobe Flash

     * Apache Flex
          + MXML

   Go

     * Fyne

   Haskell

     * wxHaskell

   Java

     * Abstract Window Toolkit
     * FXML
     * JavaFX
     * Qt Jambi
     * Swing
     * Standard Widget Toolkit
     * Google Web Toolkit
     * Lightweight User Interface Toolkit

   JavaScript

     * Dojo Toolkit
     * Echo
     * Ext JS
     * Google Closure Tools
     * jQuery UI
     * OpenUI5
     * Qooxdoo
     * YUI

   Common Lisp

     * CAPI
     * CLIM
     * Common Graphics
     * Common Lisp Interface Manager

   Lua

     * IUP

   Pascal

     * Lazarus Component Library

   Object Pascal

     * Component Library for Cross Platform
     * fpGUI
     * IP Pascal
     * FireMonkey

   Perl

     * Perl/Tk
     * wxPerl

   PHP

     * PHP-GTK
     * wxPHP

   Python

     * Tkinter
     * Kivy
     * PySide
     * PyQt
     * PyGTK
     * wxPython
     * Pyjs

   Ruby

     * Shoes
     * QtRuby

   Tcl

     * Tcl/Tk

   XML

     * GladeXML
     * Lively Kernel
     * Extensible Application Markup Language
     * XUL
     * Wt

   shell

     * Newt
     * CDK
     * Dialog

   Dart

     * Flutter

   Authority control Edit this at Wikidata
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     * WorldCat (via VIAF)

   National libraries
     * Germany
     * United States

   Retrieved from
   "https://en.wikipedia.org/w/index.php?title=GTK&oldid=1129998526"

   Categories:
     * GTK
     * Application programming interfaces
     * C (programming language) libraries
     * Cross-platform software
     * Free computer libraries
     * Free software programmed in C
     * GNOME
     * Software that uses Cairo (graphics)
     * Software that uses Meson
     * Software using the LGPL license
     * Widget toolkits
     * X-based libraries

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