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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The Scrollbar Protocol
When the user manipulates the scrollbar, it calls its registered command with some additional parameters that indicate what the user said to do. The associated widget responds to this command (e.g., its xview operation) by changing its display. After the widget changes its display, it calls the scrollbar by using its registered xscrollcommand or yscrollcommand (e.g., the set operation) with some parameters that indicate the new relative size and position of the display. The scrollbar updates its appearance to reflect this information.
The protocol supports widgets that change their display by themselves, such as when more information is added to the widget. Scrollable widgets also support a binding to <B2-Motion> (i.e., ...
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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.