February 2015
Intermediate to advanced
768 pages
26h 24m
English
Content preview from Universal Windows® Apps with XAML and C# UnleashedBecome 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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Getting Key States at Any Time
If the KeyDown, KeyUp, and AcceleratorKeyActivated events were all you had to work with, detecting key combinations (such as Alt+G) would be awkward. Each key is reported one-at-a-time, so you would need a member variable representing the state of Ctrl to set on KeyDown and clear on KeyUp. Then you could check its value when receiving another event for the letter G.
Fortunately, there are two methods for determining the state of any key at any time: GetKeyState and GetAsyncKeyState. These methods are tucked away in Window.Current.CoreWindow, a surprisingly obscure place for an important feature. This is not just useful for key combinations, but for code that isn’t driven by input events, such as a game loop.
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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.