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 Focus Highlight
Each widget can have a focus highlight indicating which widget currently has the input focus. This is a thin rectangle around each widget that is displayed in the highlight background color by default. When the widget gets the input focus, the highlight rectangle is displayed in an alternate color. The addition of the highlight adds a small amount of space outside the border described in the previous section. The attributes in Table 37-3 control the width and color of this rectangle. If the width is zero, no highlight is displayed.
By default, only the widgets that normally expect input focus have a nonzero width highlight border. This includes the text, entry, and listbox widgets. It also includes the button and menu widgets ...
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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.