Retiring, March 2020 - sorry, you have missed our final public course.
The Coronavirus situation has lead us to suspend public training - which was on the cards anyway, with no plans to resume
Please ask about private 'maintenance' training for Python, Tcl, Perl, PHP, Lua, etc
Happily continuing private consultancy / programming work
Add a friendly front end with Tk
With a Tk Graphic User Interface, you can add a friendly look and feel to an application running on your workstation if it's written in Tcl (Tcl/Tk
), Perl (Perl/Tk
) or Python (TkInter
Whichever language you build your GUI on to, you'll want to remember
1. Create your components (known as widgets) as your application starts - you'll have buttons and labels and entry boxes and frames ... and associated with some of them such as the buttons you'll have commands that are to be run later on when the button is pressed
2. Use a geometry manager to position the widgets within the application window(s) and to define how they're to react when the window is resized
3. Define any extra events - things that are to happen when the user interacts with the GUI - in addition to the commands that you specified as you defined the components.
Once you've created the components, added extra events, and placed the components you can sit back and let the application run in what's known as the event loop
. That's a loop - and it can be an infinite loop - that waits for the next event, and when it's received, you process it.
The source code of the example used to illustrate this item is only a few hundred bytes long and much of that is comments
. You can view the source code
if you wish. (written 2006-02-08, updated 2006-06-09)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesP307 - Perl/Tk 
Expect in Perl - a short explanation and a practical example - (2010-10-22) 
Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python) - (2007-09-09) 
Callbacks - a more complex code sandwich - (2007-08-19) 
(Perl) Callbacks - what are they? - (2006-05-30) 
Perl/Tk real time display - (2006-02-10) 
The magic of -textvariable - (2006-02-08)T216 - Tcl/Tk - Introduction to Tk 
Using Object Oriented Tcl and the Tk toolkit together - real life example - (2015-03-12) 
Tcl + Tk (Wish) - an introduction and revision example - (2013-11-15) 
Error: Cant read xxxxx: no such variable (in Tcl Tk) - (2009-02-14)Y205 - Further uses of Python 
Python in an afternoon - a lecture for experienced programmers - (2008-06-01) 
Python Qt, wX, TkInter, and Jython - training?? - (2007-01-16) 
Python modules. The distribution, The Cheese Shop and the Vaults of Parnassus. - (2006-06-05) 
Python engines - (2005-01-26)
Some other Articles
Should we cruise around the world?Storing a regular expression in a perl variableAdd a friendly front end with TkTwice is a co-incidence and three times is a patternFinding where the disc space has goneNOT Gone phishingKey facts - SQL and MySQLDanny and Donna are getting married
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