August 2012
Intermediate to advanced
840 pages
22h 41m
English
Content preview from Visual Basic 2012 Programmer's Reference
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TRANSPARENCY
The Form object provides a couple of properties that you can use to make a form partially transparent. Opacity determines the form’s opaqueness. At design time, the Properties window shows Opacity as a percentage where 100 percent means the form is completely opaque, and 0 percent means that the form is completely transparent. At run time, your program must treat Opacity as a floating-point value between 0 (completely transparent) and 1 (completely opaque).
A program can use an Opacity value less than 100 percent to let the user see what lies below the form. For example, you might build a partially transparent Search dialog box so the user could see the underlying document as a search progresses.
If Opacity is greater than 0 percent, the form behaves normally aside from its ghostlike appearance. The user can click it, interact with its controls, minimize and maximize it, and grab its borders to resize it.
If Opacity is 0 percent, the form is completely transparent and the user can interact with the form only through the keyboard. For example, the user can press the Tab key to move between the form’s controls, type text, press the Spacebar to invoke a button that has the focus, and press Enter or Esc to fire the form’s Accept and Cancel buttons; however, the form and its controls will not detect mouse clicks. The user also cannot see the form (obviously), so figuring out which control has the focus can be next to impossible.
TOO MUCH TRANSLUCENCY
Most applications ...
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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.
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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.