What: Wcb
Where: https://www.nemethi.de/
Description: Tcl/Tk 8.x script library which provides solutions for restricting the set of characters that can be entered into an entry or text widget, manipulating the input characters before inserting into the widget, changing the color, font, etc. of the input characters, defining commands to be invoked when selecting a listbox element, and disabling items of a listbox.
Currently at version 3.7 .
Updated: 12/2020
Contact: mailto:[email protected] (Csaba Nemethi)

Wcb is also included in tklib.

Jeff Smith 2020-12-12 : Below is an online demo using CloudTk. This demo runs Wcb in an Alpine Linux Docker Container. It is a 28.3MB image which is made up of Alpine Linux + tclkit + Wcb3.7.kit + libx11 + libxft + fontconfig + ttf-linux-libertine. It is run under a user account in the Container. The Container is restrictive with permissions for "Other" removed for "execute" and "read" for certain directories.

By clicking on the "V" in the upper left corner you can access other demos.

See also Mentry.