ltk

LTK is a set of CL bindings for the Tk GUI library, which provides a complete CLOS binding to the Tk widget set. It is implemented by means of talking to a Tcl interpreter. This makes the toolkit portable and capable of working over a remote socket.

LTK was written by Peter Herth.

Although the last release is somewhat dated, the project is still under active development. Most activity happens on its mailing list. The canonical repository seems to be on Github.

Many examples, covering the tkdocs tutorial, were contributed by Peter Lane: https://peterlane.codeberg.page/ltk-examples/.

Plotting with Ltk

A wrapper around tklib's Plotchart library is also available here: https://peterlane.codeberg.page/ltk-plotchart/.

Issues

One unfortunate problem is that LTK mysteriously fails to run on some Windows computers, depending on what programs happen to be running in the background. People are encouraged to either donate a Windows box for testing, or helpfully volunteer to track the issue down.

This may be an issue limited to certain Lisp implementations, as SBCL has not been observed to manifest this problem.

See cl-tk or clTcl for alternatives.

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