gtkmm

gtkmm is the official C++ interface to the GTK+ GUI toolkit. It provides a set of C++ wrappers around GTK+ widgets and related functionality, enabling developers to write graphical user interfaces in C++. gtkmm is part of the GTK family and the GNOME ecosystem, and it is distributed under the LGPL.

The library exposes object-oriented classes that mirror GTK+ widgets, containers, and dialogs. It uses Glibmm for GLib types and libsigc++ for signal handling, offering type-safe signal connections and RAII-style memory management. Common components include Gtk::Application, Gtk::Window, Gtk::Button, Gtk::Box, and Gtk::Builder for loading UI defined in XML. The API aims to be convenient for C++ programmers while staying faithful to the GTK+ API.

Platform and usage: gtkmm runs on Linux, Windows, and macOS, wherever GTK is supported. Applications built with gtkmm can be styled with CSS and laid out using GTK’s containers such as box and grid. Build workflows typically rely on Meson, CMake, or pkg-config-based configurations, and gtkmm depends on glibmm, libsigc++, and the GTK libraries.

Versions and history: gtkmm provides bindings corresponding to GTK+ major versions. There are gtkmm releases for GTK 2 (gtkmm-2), GTK 3 (gtkmm-3), and GTK 4 (gtkmm-4). The project is maintained by the GNOME community and a broad set of contributors, with ongoing updates to support new GTK features and platforms.