Attaching movieclip class without library symbol

Post author By Dave
Post date January 31, 2004
9 Comments on Attaching movieclip class without library symbol

Even though it is late Friday/early Saturday, I’ve got to write this one down:

Through an internal implementation of ActionScript 2.0’s compiler (which compiles code into ActionScript 1.0), Peter Hall discovered this little trick.

Here’s a shortened (and more obscured) example:

Actor.as:

class Actor extends MovieClip {
    static var id = (id="__Packages.Actor")+
        (Object.registerClass(id,Actor)?"":"");

    public function Actor() {
        trace("Action!");
    }
}

To test:

import Actor; attachMovie(Actor.id, "_mc", 1);

This keeps the number of static variables to a minimum (one). Of course, this trick works only if the compiler uses the “__Packages.” prefix to the class path internally, and may not work in future versions of Flash. Nevertheless, it’s a very cool trick.

9 replies on “Attaching movieclip class without library symbol”

Sorry, i’m french 😉

bon j’ai trouvÃ© un petit truc sympa..
j’ai Ã©purÃ© le truc vraiment sympathiquement…

expliquation :
EN voulant faire une classe MovieMaker, j’ai pu remarquer qu’un Object.registerClass(“__Package.name”,name) est sans effet tout seul comme Ã§a, en dehors de la classe car la classe doit etre “initialisÃ©” par Flash, et pour se faire, il suffit d’appeller une fonction statique de cette meme classe.. ainsi, elle sera initialisÃ© et prise en compte par flash 🙂 d’ou l’idÃ©e de mettre le registerClass dans une fonction statique et de l’appeller au dÃ©but du script, juste apres les import

voila.. cool, vous verrez, plus besoin de propriÃ©tÃ© statique..

alors je vous montre :

////////////////////////////////////////////

mycustommc.as
dynamic class mycustommc extends MovieClip
{
//Cette seule fonction statique suffira
static function register()
{
Object.registerClass(“__Packages.mycustommc”,mycustommc);
}

function mycustommc()
{

this.beginFill(0xCCCCCC,50);
this.lineStyle(1,0xFF0000,100);
this.moveTo(0,0);
this.lineTo(10,0);
this.lineTo(10,10);
this.lineTo(0,10);
this.endFill();
}
function move(aX:Number,aY:Number)
{
this._x = aX;
this._y = aY;
}
}

////////////////////////////////////////////

et la, le code pour utiliser la classe :

////////////////////////////////////////////

import mycustommc;

//Appel la fonction statique.
mycustommc.register();

it1 = attachMovie(“__Packages.mycustommc”,”mycustommc1″,getNextHighestDepth());
it1.move(100,100);

it2 = attachMovie(“__Packages.mycustommc”,”mycustommc2″,getNextHighestDepth());
it2.move(300,100);

////////////////////////////////////////////

donc, ceci est juste un petit exemple.. aprÃ¨s on pourra faire chacun nos chouettes classes moviemaker Ã notre gout 😉

dites moi ce que vous en pensez!

yves

Yes, I had a look at the French comments at TweenPix. One of them uses __proto__ to link on-stage movieclips to classes; this was first used in Flash 5. See my other site for more info: http://www.quantumwave.com/flash/vmc.html (I wouldn’t use this in AS2 coding though).

9 replies on “Attaching movieclip class without library symbol”

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