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Tcl/Tk module T224
Events in Tk
Exercises, examples and other material relating to training module T224. This topic is presented on public courses Learning to program in Tcl, Tcl/Tk, Extra Day, Tcl Programming

Events are what happen in TK when a button is pressed, the cursor moves over your window, or your window resizes...amongst other things. Some events (such as a subtle change of colour as you move over a button) are provided by default. You provide action for other events (such as button presses) when you define the button, and there's a final class of events that you can add once you've completed definition of a widget. In this module, you'll learn how to define your own events handlers, bind them to particular events, override system events if need be, and more.

Related technical and longer articles
Defining events including variable values in Tk

Articles and tips on this subjectupdated
4258Keeping you Tkinter display up to date while monitoring
Have you ever updated a web page just to find that something changes and it needs to be updated again? Have you every tidied the kitchen just to find it messy again within a few minutes? Are there time when it's sensible to say "we'll leave that until ..."? It's the same when you're programming ...
2014-04-06
 
3575Multiple buttons calling the same proc in wish (tcl/tk)
Question: 1. I have created a table dynamically using a for loop in Tcl/Tk. 2. One of the columns in the table is a column of buttons 3. All the buttons call the same action proc as the each do something similar How can I set up the buttons so that I know which was pressed in the action proc? Answer: Pass ...
2012-01-14
 
1473Making a variable dynamically visible in a Tcl/Tk GUI
set bill "and Ben" label .about -textvariable bill button .first -text "First" -command {set bill Bradshaw} button .second -text "Second" -command {set bill Bailey} button .done -text quit -command exit pack .about .first .second .done Tcl/Tk's -textvariable option, on commands like label and button, ...
2007-12-16
(short)
386What is a callback?
When you write a program, you're usually providing the filling for a sandwich. At the top level, you have the operating system and the compiler or interpreter for the particular language you're using and this provides you with the mechanism to start and end your program, and for it to share the resources ...
2006-06-05
 
Examples from our training material
caneve   Binding canvas events and keys
tkbb   Button Binding example
tke2   Events to toggle text on a widget.
tke3   Button bindings to a single proc.
tke5   Button binding for all keys, down and up
tke6   Keysym Tester
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
The event model.
Binding tags and events.
Event types and names.
Event keywords.
Virtual events.
Event sequences.
Update idletasks.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Tcl/Tk, Expect,Ruby, Lua, Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

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