Re: Keyboard state (instead of keyboard events)

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.gui

Date:

Wed, 31 Dec 2008 20:27:25 -0800

Message-ID:

<495c460f$0$25402$b9f67a60@news.newsdemon.com>

John B. Matthews wrote:

In article <495c0598$0$25404$b9f67a60@news.newsdemon.com>,
Knute Johnson <nospam@rabbitbrush.frazmtn.com> wrote:

John B. Matthews wrote:

Philipp : Works well on MacOS 10.5.6, Java 1.5, PPC. I get no false
negatives with limited testing at various rates. I'm wary of relying on
this sort of undocumented behavior, but I think I see why you're doing
it. In effect, auto-generated released-pressed pairs appear to share the
same time stamp. Would testing "delta < 1" be better than testing for
equality?

Throw out the getWhen() part, you don't need it. Just set the flag when
the key is pressed, and clear it when it's released.

Knute: On MacOS (Darwin/BSD) and (IIUC) on Linux, automatic key repeat
generates continual triplets: pressed, typed, released, [pressed, typed,
released]. This appears not to be the case on Windows.

John:

I don't have a MacOS system to try it on and only xubuntu for linux but
it does not do that on xubuntu 8.10 with Sun 1.6. I would think that
this is a serious bug and not expected behavior.

You are correct. Sadly, I am insane. I tried to verify my claimed
repeating pattern using a tutorial example. Auto-repeat produces a
series of pressed and typed events; a released event only occurs when
the key is, um, released:

We're all insane, it's the CRS that's really starting to bother me :-).

<http://java.sun.com/docs/books/tutorial/uiswing/examples/events/KeyEvent
DemoProject/src/events/KeyEventDemo.java>

I back-ported your asteroids game to 1.5 enough to rotate and shoot.
It's smooth. When I comment out the getWhen() logic in Phillip's
example, I get correct results. On reflection, I must wonder what
problem Phillip's code seems to fix.

I have no clue.

Is there not a 1.6 for Mac yet?

--

Knute Johnson
email s/nospam/knute2008/

--
Posted via NewsDemon.com - Premium Uncensored Newsgroup Service
------->>>>>>http://www.NewsDemon.com<<<<<<------
Unlimited Access, Anonymous Accounts, Uncensored Broadband Access