Binder

Binder
Here's a little class I wrote to easily bind keys to a specific function. It is a class with two static functions, bind and unbind, for obvious purposes. It takes care of the whole listener deal for you, all you need to do to bind a key to a specific function is:


ActionScript Code:
Binder.bind("g", gotoAndPlay, _root, [6]);


That will execute _root.gotoAndPlay(6) when you hit g. The syntax for the function to apply is the same as the Function.apply syntax:


Quote:




Usage:

myFunction.apply(thisObject, argumentsObject);

Parameters:

thisObject The object that myFunction is applied to.

argumentsObject An array whose elements are passed to myFunction as parameters.




So in the example above, the function call would render as

ActionScript Code:
gotoAndPlay.apply(_root, [6])
which is the same as
ActionScript Code:
_root.gotoAndPlay(6);


Or, for any other function that takes more arguments:

ActionScript Code:
theSum = sum.apply(null, [5,4,3,6,7]);

The sum function would then count up 5+4+3+6+7, and return the result to be stored in theSum. Because sum is a regular function and not a method, thisObject is null.

Here's the class code:

ActionScript Code:
class Binder {        static var count:Number = 0;    static var objects:Array = new Array();        function Binder(){    }        static function bind(key:String, applyFunction:Function, applyObject:Object, applyParams:Array) {                for(var i=0;i<count;i++){            if(objects[i].hitkey == key.toLowerCase()){                trace("Could not bind key "+key+": key already bound.");                return false;            }        }                var newListener = new Object();        newListener.hitkey = key.toLowerCase();        newListener.applyFunction = applyFunction;        newListener.applyObject = applyObject;        newListener.applyParams = applyParams;                Key.addListener(newListener);                newListener.onKeyDown = function(){            var pressedKey:String = String.fromCharCode(Key.getCode()).toLowerCase();            if(pressedKey == this.hitkey){                this.applyFunction.apply(this.applyObject, this.applyParams);            }        }                objects[count++] = newListener;            }        static function unbind(key:String):Void {                for(var i=0;i<count;i++){            var curListener:Object = objects[i];            if(curListener.hitkey.toLowerCase() == key.toLowerCase()){                Key.removeListener(curListener);                objects.splice(i,1);                count--;            }        }            }    }


I've attached the .as file

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