Question

I want to pass parameters when an event is triggered. My function:

private function keyChange(e:KeyboardEvent, setValue:Boolean):void

so that I can use the same function to set if a key is up or down. How would I write the event listener? I tried:

stage.addEventListener(KeyboardEvent.KEY_DOWN, keyChange(,true));

however that didn’t work. Is this possible? Thanks

Answer 1

Like so:

stage.addEventListener(KeyboardEvent.KEY_DOWN, keyChangeHandler);
stage.addEventListener(KeyboardEvent.KEY_UP, keyChangeHandler);

...

private function keyChangeHandler(e:KeyBoardEvent):void
{
    var keyDown:Boolean = e.type == KeyBoardEvent.KEY_DOWN;

    ...
    // Do stuff
}

However if you want to pass parameters, you need to use a custom event:

public class KeyBoardActionEvent extends KeyBoardEvent
{
    public var shouldSetValue:Boolean;
    public function KeyBoardActionEvent(setValue:Boolean, type:String, bubbles:Boolean = false, cancelable:Boolean = false):void
    {
        shouldSetValue = setValue;
        super(type, bubbles, cancleable);
    }
}