Exercises, examples and other material relating to training module T222. This topic is presented on public course Tcl/Tk
Even a widget as simple as a label has some 20 different settings (also known as properties) that can affect its look and feel. Typically, the author of a Tk program will alter a minimum of these, as all resources have a default or "fallback" value. Users can override fallbacks through general setting files, and through files that include settings for specific applications. Programmers can give users the option of loading sets of resources from file as well. Resource setting is useful for applications which may be used by people with poor sight or who are colour blind, and also for giving a consistent look and feel to a group of related windows or applications.
|Articles and tips on this subject||updated|
|1474||Using Tcl/Tk resource files for flexible applications|
If you're looking to write a Tcl/Tk application that can be flexibly configured, don't forget to use named resources. Here are two displays from the same program:
So - how did I get the difference in colour and text labels?
1. I drew the buttons WITHOUT ANY TEXT AT ALL, and I did NOT specify a background ...
Examples from our training material
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 resource hierarchy.
Loading the resource database.
Setting resources by class and widget type.
Other subcommands of option.
Design aspects, size etc..
User defined buttons.
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