Beyond Linux® From Scratch (systemd Edition) - Version 12.1

Chapter 25. Graphical Environment Libraries

GTK-4.12.5

Introduction to GTK 4

The GTK 4 package contains libraries used for creating graphical user interfaces for applications.

This package is known to build and work properly using an LFS 12.1 platform.

Package Information

GTK 4 Dependencies

Required

FriBidi-1.0.13, gdk-pixbuf-2.42.10, graphene-1.10.8, ISO Codes-4.16.0, libepoxy-1.5.10, libxkbcommon-1.6.0, Pango-1.51.2, PyGObject-3.46.0, and wayland-protocols-1.33

Recommended

adwaita-icon-theme-45.0 (default for some gtk4 settings keys), gst-plugins-bad-1.22.10, gst-plugins-good-1.22.10 (runtime, built with libvpx-1.14.0), hicolor-icon-theme-0.17 (needed for tests and for defaults), and librsvg-2.57.1

Recommended (Required if building GNOME)

gobject-introspection-1.78.1

Optional

colord-1.4.7, Cups-2.4.7, docutils-0.20.1, FFmpeg-6.1.1 (built with libvpx-1.14.0), Gi-DocGen-2023.3, Highlight-4.10 (runtime, only used by gtk4-demo for syntax highlighting of demo source code), libcloudproviders-0.3.5, sassc-3.6.2, Tracker-3.6.0, Vulkan-Loader-1.3.277, cpdb, and sysprof

Installation of GTK 4

Install GTK 4 by running the following commands: 

mkdir build &&
cd    build &&

meson setup --prefix=/usr           \
            --buildtype=release     \
            -Dbroadway-backend=true \
            -Dintrospection=enabled \
            .. &&
ninja

If you have Gi-DocGen-2023.3 installed and wish to build the API documentation for this package, issue: 

sed "s@'doc'@& / 'gtk-4.12.5'@" -i ../docs/reference/meson.build &&
meson configure -Ddocumentation=true                             &&
ninja

To run the tests, issue: dbus-run-session meson test --setup x11. If you are in a Wayland session, replace x11 with wayland. Nine tests are known to fail if Cantrell fonts are not installed. Many tests will fail if ~/.config/gtk-4.0/settings.ini exists and the gtk-modules line is not commented out. On systems with NVIDIA graphics cards, the tests may take significantly longer than the above test time.

Now, as the root user: 

ninja install

Command Explanations

--buildtype=release: Specify a buildtype suitable for stable releases of the package, as the default may produce unoptimized binaries.

-Dbroadway-backend=true: This switch enables the HTML5 GDK backend.

-Dintrospection=enabled: This switch enables using gobject-introspection-1.78.1 to generate GIR bindings of this packages. These bindings are required by GNOME.

-Dcloudproviders=enabled: Use this switch if you have libcloudproviders-0.3.5 installed and wish to enable support for cloud providers in a file chooser window.

-Dtracker=enabled: Use this switch if you have Tracker-3.6.0 installed and wish to use search functionality when running a file chooser.

-Dcolord=enabled: Use this switch if you have colord-1.4.7 installed and wish to use colord with the CUPS printing backend.

-Dman-pages=true: Use this switch if you have docutils-0.20.1 installed and wish to generate the man pages.

-Dsysprof=enabled: Use this switch if you have sysprof installed and wish to enable tracing support for GTK4-based applications.

-Dvulkan=enabled: Use this switch if you have Vulkan-Loader-1.3.277 installed and wish to build the experimental Vulkan backend. Note that you must have glslc installed if you decide to enable this option.

Configuring GTK 4

Config Files

~/.config/gtk-4.0/settings.ini and /usr/share/gtk-4.0/settings.ini

Configuration Information

GTK 4 themes change the way a GTK 4 application looks. An icon theme can be used to change the icons that appear on the application's toolbar. If you have installed a GTK 4 theme (e.g. the Adwaita theme built in GTK 4), an icon theme (such as oxygen-icons-5.115.0) and/or a font (Dejavu fonts), you can set your preferences in ~/.config/gtk-4.0/settings.ini, or the default system-wide configuration file (as the root user), in /usr/share/gtk-4.0/settings.ini. For the local user, an example is: 

mkdir -pv ~/.config/gtk-4.0
cat > ~/.config/gtk-4.0/settings.ini << "EOF"
[Settings]
gtk-theme-name = Adwaita
gtk-icon-theme-name = oxygen
gtk-font-name = DejaVu Sans 12
gtk-cursor-theme-size = 18
gtk-xft-antialias = 1
gtk-xft-hinting = 1
gtk-xft-hintstyle = hintslight
gtk-xft-rgba = rgb
gtk-cursor-theme-name = Adwaita
EOF

There are many settings keys, some with default values. You can find them at Settings: GTK 4 Reference Manual.

Contents

Installed Programs: gtk4-broadwayd, gtk4-builder-tool, gtk4-demo, gtk4-demo-application, gtk4-encode-symbolic-svg, gtk4-icon-browser, gtk4-launch, gtk4-node-editor, gtk4-print-editor, gtk4-query-settings, gtk4-update-icon-cache, and gtk4-widget-factory
Installed Libraries: libgtk-4.so
Installed Directories: /usr/include/gtk-4.0, /usr/lib/gtk-4.0, and /usr/share/gtk-4.0

Short Descriptions

gtk4-broadwayd

provides support for displaying GTK 4 applications in a web browser using HTML5 and web sockets

gtk4-builder-tool

performs various operations on GtkBuilder .ui files

gtk4-demo

is a simple program that demonstrates some of the tasks that can be done with GTK 4

gtk4-demo-application

is a simple GTK 4 application which is useful for testing

gtk4-encode-symbolic-svg

converts symbolic SVG icons into special PNG files. GTK 4 can load and recolor these PNGs, just like original SVGs, but loading them is much faster

gtk4-icon-browser

is a utility to explore the icons in the current icon theme. It shows icons in various sizes, their symbolic variants when available, as well as a description of the icon and its context

gtk4-launch

launches an application using the given name. The name should match the application .desktop file name (as seen in /usr/share/applications), with or without the '.desktop' extension

gtk4-node-editor

is a utility to show and edit render node files. Such render node files can be obtained e.g. from the GTK inspector

gtk4-print-editor

is a simple program to demonstrate printing using GTK 4 applications

gtk4-query-settings

provides a complete listing of all settings related to GTK 4

gtk4-update-icon-cache

is an icon theme caching utility that creates mmap()able cache files for icon themes

gtk4-widget-factory

is a program to view GTK 4 themes and widgets

libgtk-4.so

contains functions that provide an API to implement graphical user interfaces