Tcl/Tk - First Widgets, Geometry and Events

Tcl/Tk module T217

First Widgets, Geometry and Events

Exercises, examples and other material relating to training module T217. This topic is presented on public course Tcl/Tk

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]

Writing a Tcl/Tk GUI is as easy as baking a cake

Designing a Graphic User Interface in Tcl/Tk is rather like writing a recipe. With a recipe, you start off by listing the ingredients you need ... and ...

http://www.wellho.net/mouth/309_Writ ... -cake.html [short article]

Tcl/Tk - First Frame

#!/usr/bin/wish proc review {what} { global value switch $what { 1 {set value 1} > {set value ...

http://www.wellho.net/resources/ex.php4?item=t217/tk_wm [code sample]

Tcl/Tk - button states

#!/usr/bin/wish proc review {what} { global value switch $what { 1 {set value 1} > {set value ...

http://www.wellho.net/resources/ex.php4?item=t217/tk_b4 [code sample]

Sample answer 1 - coloured labels and layout question

#!/usr/bin/wish proc testgoes {newcol} { .mid config -background $newcol } frame .left frame .right button .left.top -text red -background ...

http://www.wellho.net/resources/ex.php4?item=t217/colmat [code sample]

Tk - attributes of a button

#!/usr/bin/wish proc flip {} { global state set state [expr 1 - $state] set word [lindex "Marmite Bovril" $state] .tog ...

http://www.wellho.net/resources/ex.php4?item=t217/tk_b3 [code sample]

Tcl/Tk - Event demo

#!/usr/bin/wish proc flip {} { global state feelings set state [expr 1 - $state] set word [lindex "Marmite Bovril" $state] ...

http://www.wellho.net/resources/ex.php4?item=t217/tk_event [code sample]

Tk programming is all about widgets, geometry managers and events. This module introduces you to each of these concepts, then examines one particular widget type, one particular geometry manager, and one particular type of event to a level where you can write your first useful GUI under Tk.

This topic is presented on public course Tcl/Tk

Examples from our training material

colmat	Sample answer 1 - coloured labels and layout question
colmat2	Sample answer 3 in development
colmat3	Sample answer 3 - Completed layout question
deferintk	Deferred execution can cause a problem in Tk
tk_b1	Tcl/Tk - button test 1
tk_b2	Tcl/Tk - button test 2
tk_b3	Tk - attributes of a button
tk_b4	Tcl/Tk - button states
tk_event	Tcl/Tk - Event demo
tk_wm	Tcl/Tk - First Frame

Pictures

Learning Tcl/Tk for a custom GUI application

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 http://www.training-notes.co.uk.

Topics covered in this module

The button widget.
Resources.
State.
Design notes.
The pack geometry manager.
Changing how pack works.
More flexible packing.
Frames.
Frame hierarchy.
The parent frame.
The window manager command.
Button presses and other events.
Summary.

Complete learning

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