November 1999
Intermediate to advanced
832 pages
19h 28m
English
Content preview from Practical Programming in Tcl & Tk, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Specifying Widget Attributes
Several of the fields in the Clock structure are attributes that can be set when the widget is created or reconfigured with the configure operation. The Tk_ConfigureWidget procedure is designed to help you manage the default values, their resource names, and their class names. It works by associating a widget option with an offset into the widget data structure. When you use a command line argument to change an option, Tk_ConfigureWidget reaches into your widget structure and changes the value for you. Several types are supported, such as colors and fonts, and Tk_ConfigureWidget handles all the memory allocation used to store the values. Example 46-9 shows the Tk_ConfigSpec type used to represent information about ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.