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Tcl + Tk (Wish) - an introduction and revision example
Whenever I teach Tcl with Tk, I'm delighted to be reminded how easy it is to put together a graphic user interface (GUI) with Tcl. They may not be the world's prettiest, but they're quick, straightforward and functional. And so it was on the final day of our Tcl Programming course
last week, when I did just half an hour on Tk and wish.
* At the start of your code, define procedures that are to be performed when buttons are pressed or data is entered in some other way
* Define the components of your GUI, including a note of which function each is linked to
* Define the layout - how the components are drawn in relationship to each other and to the window in which they appear
... and that can be about it!
The example shown here is three concurrent runs of a GUI with a simple increment / decrement counter that's also changing the colour of the targeted label on the interface. A simple but effective demonstration.
Full source code is [here]
. (written 2013-11-15, updated 2013-11-16)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesT216 - Tcl/Tk - Introduction to Tk 
Using Object Oriented Tcl and the Tk toolkit together - real life example - (2015-03-12) 
Error: Cant read xxxxx: no such variable (in Tcl Tk) - (2009-02-14) 
Add a friendly front end with Tk - (2006-02-08)T248 - Tcl/Tk - A Review of Tcl and Tk Basics 
Curley brackets v double quotes - Tcl, Tk, Expect - (2007-12-12) 
Good Programming practise - where to initialise variables - (2007-05-09) 
Installing Tcl and Expect on Solaris 10 - a checklist - (2007-05-02) 
Tcl training - often for a larger group - (2007-02-24)
Some other Articles
Python functions - an introduction to how they workHandling JSON in Python (and a csv, marshall and pickle comparison)If elif elif elif - multiway selection in PythonLists in Tcl - fundamentals in a commented source code exampleTcl + Tk (Wish) - an introduction and revision exampleException handling in TclWriting the perfect program in Tcl?Regular Expression Substitution - TclWith the Shpigs and DonkeysA weekend away - Four in a Bed returns to Happy Donkey Hill
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