August 2007
Intermediate to advanced
864 pages
25h 52m
English
Content preview from Programming WPF, 2nd Edition
Become 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,
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.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.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.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.
Keyboard Input
The target for mouse input is always the element currently under the mouse, or the element that has currently captured the mouse. This doesn't work so well for keyboard input—the user cannot move the keyboard, and it would be inconvenient to need to keep the mouse directly over a text field while typing. Windows therefore uses a different mechanism for directing keyboard input. At any given moment, a particular element is designated as having the focus, meaning that it acts as the target for keyboard input. The user sets the focus by clicking the control in question with the mouse or stylus, or by using navigation keys such as the Tab and arrow keys.
Tip
The UIElement base class
defines an IsFocused property, so
in principle, any user interface element can receive the focus.
However, the Focusable property
determines whether this feature is enabled on any particular element.
By default, this is true for controls, and false for other
elements.
Table 4-2 shows the keyboard input events offered by user interface elements. Most of these items use tunnel and bubble routing for the preview and main events, respectively.
Table 4-2. Keyboard input events
Event | Routing | Meaning |
|---|---|---|
| Tunnel, Bubble | Element received the keyboard focus. |
| Tunnel, Bubble | Element lost the keyboard focus. |
| Bubble | Element received the logical focus. |
| Bubble | Element lost the logical focus. |
|
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.