flash actionscript: Hi all-

Maybe I'm missing something obvious, but I can't quite figure this one out.
Is there any way to check and see if a specific key has been relased? I'm
working on a game that currently works great with a mouse, but I'm trying to
convert it so that it works with keyboard as well. Right now I have a function
that is called by an onMouseDown event, and then a separate function called on
the onMouseUp event.

I'd like to do the same thing with the keyboard, and I've come very close
through a few different ways, but nothing quite gets me there.

Make sense? Let me know if you need more info...

The "ideal" code would go something like this:




onKeyDown(Key.SPACE) {
do something ONCE;
}
onKeyUP(Key.SPACE) {
do something else ONCE;
}

:



lo = new Object();
lo.onKeyDown = function() {
if (Key.isDown(Key.SPACE)&&!repeat) {
downBool = true;
repeat=1;
} else {
downBool = false;
}
};
lo.onKeyUp = function() {
repeat=0;
if (downBool) {
trace("UP");
}
};
Key.addListener(lo);

Thanks kglad. That seems close. I'll have to try and plug in something like
that. At a glance, though, I'm not seeing how that would translate to multiple
keys. Would you recommend a separate object for each key to be checked?
Otherwise, every time any key was released the repeat var would be set to 0.
Or does each key to be checked require its own two variables, such as
bolSpaceRepeat and bolSpaceDown? You follow?

Thanks,
SyddyS

Hmmm... just ran a test on that code, and while it works if you quickly press
and release the Spacebar, if you hold it down for a moment the Up function
isn't triggered. Is this related to the Flash 8 bug/feature I've read about
regarding the onKeyUp function?

what's wrong with:



lo = new Object();
lo.onKeyDown = function() {
keyAscii = Key.getAscii();
};
lo.onKeyUp = function() {
trace(keyAscii);
};

Thanks for working with me on this!

Running your code yields the following problem, which is actually similar to
where I got stuck in my own code and came here.

Press and release A key, traces 97
Press and release B key, traces 98
Press and hold A key, then press and hold B key, then release A key and you
get... TADA! Nothing! Until you release the B key which then traces 98.
Grrr...

Maybe it would be helpful to know what I'm trying to do. I have a guy that
moves back and forth controlled by the left and right arrow keys. He throws a
ball- but pressing the spacebar increments a power variable, and releasing it
throws the ball with the distance determined by the power variable. So...
using the code above if you start to "power up" with the spacebar, then start
moving left, then release the spacebar- nothing happens.

This process works great with the onMouseDown and onMouseUP, but unfortunately
I need to convert this to keyboard for this particular application.

Thanks again for any insight you or anyone else might have!

-SyddyS

you aren't going to be able to use key listeners for this because the onKeyDown
only detects the most recent key pressed and the onKeyUp only executes when all
keys are up (and so can be used to detect the last key released).

you'll need to use a loop that repeatedly checks which keys are pressed.
you'll need to track all key presses and use that information to determine when
a key is released: ie, it was detected by your loop and then it is not
detected.

yes, it is going to require storing (say the ascii) value of the keys pressed
on each loop and then checking if any of the previously pressed keys are not
being pressed.

i think i would use an associative array to track the keys pressed on any
given loop. that would make it easy to check on the next loop if those keys
are still being pressed and it would make it easy to adjust the array when the
key presses change.