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  not registering spacebar when up and left is pressed  (Read 3411 times)
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Offline achoi77

Junior Newbie

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« Posted 2008-03-05 05:03:39 »

I was writing a little app using Slick, and I came across this little issue. I thought for a while that it had something to do with my code, then I came across this:

and was getting the same result: I would hold down up and left, and while both would register, pressing the spacebar doesn't when the up and left keys are held down. Anyone else come across this? I wonder if it's my keyboard - I'm on a Dell laptop (XPS M1210) running Vista
Offline endolf

JGO Coder

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« Reply #1 - Posted 2008-03-05 06:58:51 »

Same happens on my Inspiron 8600. Interestingly, up + left + 5 + 4 works. If you open notepad, hold down up and left, and then press space does a space character appear?, it doesn't for me, which means the OS doesn't like that key combination, so we are never going to be able to see it in any applications either.



Offline oNyx

JGO Coder

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« Reply #2 - Posted 2008-03-05 08:11:17 »

It's a hardware issue. See:

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Offline broumbroum

Junior Devvie

« Reply #3 - Posted 2008-03-05 23:54:31 »

hi! I can't tell you if the JInput handles keyboard, because I use JInput for the Gamepad handler. But keyboard is really simple to handle with the common AWT dispatcher. But as far as I tested AWT with keyboard, I've experienced multiple issues, especially with the key-pressed EVENT. It can be dispatched repeatly or once. Anyway, handling correctly a keyboard event is notifying accurately WHEN and WHERE the event is handled. have a look at the KeyEventDispatcher interface and you can notice two things : the returned BOOLEAN and  the KeyboardFocusManager that it is handling the impl. interface.
class MyKeybardHandler implements KeyEventDispatcher {
    // registry for the dispatched EventObject's
    SortedMap<Long, Integer> events = Collections.synchronizedSortedMap(new TreeMap<Long, Integer>());
    public boolean dispatchKeyEvent(KeyEvent e) {
       // usually, we handle a KeyEvent over a switch callback
       switch(e.getID()) {
               case KeyEvent.KEY_PRESSED:
                        events.put(e.getWhen(), e.getKeyCode());
                        return true;
               case KeyEvent.KEY_RELEASED:
                        if(events.containsValue(e.getKeyCode())) {
                              synchronized(events) {
                              for(Iterator<Long> it = events.values().iterator(); i.hasNext();) { if(e.getKeyCode() == i.remove(); }
                              return true;
                        } break;
       } return false;
adding this class to a KeyboardFocusManager and you can detect the pressed keys on your keyboard. It is important to "focus" on the real time processing events, not the processed event realizing timing. Smiley If you want KeyEvent.KEY_TYPED events, you must be aware that that type of event is SEPARATELY dispatched by AWT, thus it must be handled seperately from the two types above, eventually as a separate Thread.

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