» Up Up Down Down Left Right Left Right B A

While showering last night (this is usually when ideas and / or solutions present themselves) I came up with this idea.

Basically it’s a simple class that allows you to listen for specific sequences of keystrokes. So if the user was to press the sequence in the title, in the correct order naturally, you might react to it in any way you might deem funny. Code beneath the cut.

(BTW: I’m not all that familiar with the Text package in AS3 yet, so if there is some kind of method that does this for you please let me know.)

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package{

import flash.display.*;
import flash.events.*;

public class CheatCode extends EventDispatcher {

//Create an array to keep our key sequence
var aKeys:Array;
// Counter to keep track of keystrokes
var count: int;

public function CheatCode (stage:Stage){

trace("I'm here baby")

stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);
// Start at zero
count = 0;
// Keycodes for "Up Up Down Down Left Right Left Right B A"
aKeys = new Array(38,38,40,40,37,39,37,39,66,65);

}

private function onKeyUp(ke:KeyboardEvent) : void {

for (var i:int = 0; i < aKeys.length; i++) {
if (count == i) {
if (ke.keyCode != aKeys[i]) {
/*If the keystroke DOESN'T match the
keyCode at the array position
set the counter back to zero
and start over*/
count = 0;
return;
} else {
/*If, however, it DOES match
advance the counter
and keep listening*/

trace(count + " correct. Keep going")
count++;

if (count != aKeys.length) {
/*If the keystrokes so far are
correct but we're not yet at the
end of the sequence; Carry on.*/
return;
}
}
}
/*And, finally; When we're at the
end of the sequence and all is well
reset count and dispach an event to
which one might want to react.*/
if (count == aKeys.length) {
count = 0;
dispatchEvent(new Event("CodeEntered",true,false));
}

}

}
}

}

The class + Usage example file here.

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Up Up Down Down Left Right Left Right B A

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