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 subject | updated |
4258 | Keeping 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 |
3575 | Multiple 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 |
1473 | Making 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) |
386 | What 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
Binding tags and events.
Binding Tags.
Events.
Keys and Buttons.
Mouse Movements.
Window Happenings.
OS Specific.
Event keywords.
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