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Tk

Tk
Tcl logo
Tk-Demo using Tk 8.6.6 on Windows 10, November 2016.png
Tk 8.6.6 on Windows 10
Original author(s) John Ousterhout
Developer(s) Tcl Core Team
Initial release 1991; 26 years ago (1991)
Stable release
8.6.6 / 27 June 2016; 10 months ago (2016-06-27)
Repository core.tcl.tk/tk
Development status Active
Written in C
Operating system Cross-platform
Platform Cross-platform
Type Widget toolkit
License BSD-style
Website www.tcl.tk

Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.

Tk provides a number of widgets commonly needed to develop desktop applications, such as button, menu, canvas, text, frame, label, etc. Tk has been ported to run on most flavors of Linux, Mac OS, Unix, and Microsoft Windows. Like Tcl, Tk supports Unicode within the Basic Multilingual Plane but it has not yet been extended to handle 32-bit Unicode.

Tk was designed to be extended, and a wide range of extensions are available that offer new widgets or other capabilities.

Since Tcl/Tk 8, it offers "native look and feel" (for instance, menus and buttons are displayed in the manner of "native" software for any given platform). Highlights of version 8.5 include a new theming engine, originally called Tk Tile, but now generally referred to as "themed Tk", as well as improved font rendering. Highlights of version 8.6 include PNG support and angled text.

Tk was developed by John Ousterhout as an extension for the Tcl scripting language. It was first publicly released in 1991. Tk versioning was done separately from Tcl until version 8.0.

Tk was written originally for Unix/X11, and proved extremely popular with programmers in the 1990s by virtue of its being significantly easier to learn and use than Motif and other dominant X11 toolkits of the time. Tk was also ported to Microsoft Windows and Macintosh platforms, starting with Tk 4.2 and improved with native look and feel in Tk 8.0 (released 1997). To mark the popularity and significance of Tk in the 1990s, John Ousterhout was given the ACM Software System Award in 1997 for Tcl/Tk:


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