Hey FlashCoders:
In the app I am building, I have a need to add and remove
functionality to an object at runtime--specifically, functionality
that will snap the object to a border. I have puzzled on this for
awhile, and the method that seems most applicable to me is the Flair
pattern described in "OOP with ActionScript" by Hall & Wan. If you
don't have the book, the pattern, in short, is a static class that
dynamically creates a child object on the class it is modifying, and
then adds methods and properties to that object.
My question is: has anyone else used this pattern in AS2 projects? Is
it even the best way to achieve what I am trying to achieve? An
outline of my SnapFlair class follows below.
Any input you can offer is greatly appreciated, as always,
OK
DAH
SNAPFLAIR CLASS
Implemented as a Singleton
class SnapFlair {
private static var _obj:SnapFlair;
private function SnapFlair() {}
/**
* @param target The MovieClip being 'flaired'
* @param source The source of the event that the flair
functionality is listening for
* @param eventName The name of the event that the flair is listening
for
*/
public function snapOn( target:MovieClip, source:Object,
eventName:String ) {
target.mc.$snapFlair = new Object();
target.mc.$snapFlair._obj = target;
source.addEventListener( eventName, target.$snapFlair );
target.mc.$snapFlair[eventName] = onEvent;
}
public static function getObj():SnapFlair {
if (SnapFlair._obj == null) {
SnapFlair._obj = new SnapFlair();
}
return _obj;
}
public function snapOff( target:MovieClip, source:Object,
eventName:String ) {
source.removeEventListener(eventName, target.$snapFlair)
delete target.mc.$snapFlair;
}
public function onEvent( evt:Object ) {
// do stuff
}
public function toString():String {
return "Class SnapFlair";
}
}
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