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

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Tcl - the Tk Toolkit - training course - The Graphic Application of Tcl through Tk Tcl - the Tk Toolkit - The Graphic Application of Tcl through Tk This course takes the programmer who's already learnt to program in Tcl forward into the ... http://www.wellho.net/course/tkfull.html  [course]

Extra Days - training course - Subjects not covered on regular public courses! Extra Days - Subjects not covered on regular public courses! We offer a wide range of public courses which well cover the training needs of the majority ... http://www.wellho.net/course/axfull.html  [course]

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 ... http://www.wellho.net/mouth/386_What ... back-.html  [short article]

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 ... http://www.wellho.net/mouth/1473_Mak ... k-GUI.html  [short article]

Defining events including variable values in Tk With Tcl/Tk, you assign an action to a button when you define the button. The action is often specified by the -command option, and it s important to ... http://www.wellho.net/solutions/tcl-defi ... in-tk.html  [longer article]

Button Binding example #!/usr/bin/wish # Tcl/Tk - button bindings proc one {letter} { puts -nonewline $letter flush stdout } button .demo -text Demonstration ... http://www.wellho.net/resources/ex.php4?item=t224/tkbb  [code sample]

Binding canvas events and keys #!/usr/bin/wish proc setnow {x y} { global downx downy upx upy down if $down { set downx $x set downy $y ... http://www.wellho.net/resources/ex.php4?item=t224/caneve  [code sample]

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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.

This topic is presented on public courses Tcl/Tk, Extra Day

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