On Sun, 12 Sep 2010 06:11:09 +0200, Tom Ostojich <tostoj...@gmail.com>
wrote:
> Hey all,
>
> Excuse me if I'm missing something obvious, since I'm new to both Haskell
> programming and even newer yet to GUI programming, but I'm not sure on
> how
> to resolve this issue.
>
> Basically, I know that you can use the charKey function to determine
> whether
> or not a character key is pressed, but there appears to be no standard
> library function for checking if a key and a modifier, such as the
> Control
> or Meta keys, are pressed as well.
>
> Is there a way to get something so that, once a <modifier> + <character
> key>
> combination is pressed to generate an appropriate event, so I can do
> stuff
> with that combination?
>
Somehow, the code in my previous mail was mangled (probably because of the
'>' at the start of the lines), so here is it again.
I used the following function to handle keystrokes without modifier keys:
handleKeyboard :: MainFrame -> Var GameState -> EventKey -> IO ()
handleKeyboard f game k =
if noModifierKeyPressed
then
case keyKey k of
KeyChar 'z' -> moveLeft f game
KeyChar 'c' -> moveRight f game
KeyChar 's' -> moveUp f game
KeyChar 'x' -> moveDown f game
KeyLeft -> moveLeft f game
KeyRight -> moveRight f game
KeyUp -> moveUp f game
KeyDown -> moveDown f game
_ -> propagateEvent
else
propagateEvent
where
noModifierKeyPressed = keyModifiers k == Modifiers False False False
False
This handles keyboard events, see [0]; use the following to activate this:
set f [ on keyboard := handleKeyboard f game ]
where f is the handle of frame.
Regards,
Henk-Jan van Tuyl
[0]
http://hackage.haskell.org/packages/archive/wx/latest/doc/html/Graphics-UI-WX-Events.html
--
http://Van.Tuyl.eu/
http://members.chello.nl/hjgtuyl/tourdemonad.html
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