Posted in as2 by nicoB on June 28th, 2007
It’s been online for a long time now, but I’ve discovered it not so long ago. So there is a little tip that can be useful (for the ones who already know it, I’m sorry).
Sometimes, you have a class that extends a MovieClip which is empty. If you wan’t to attach this mc on the scene, you have to create a new empty symbol in the library and give him a linkage (identifier and class). It’s quite boring to do.
There is a solution to bypass this (found by Peter Hall) :
1. Create your class which extends MovieClip :
class net.nicoB.LinkedClass extends MovieClip {
public function LinkedClass(){
trace("hello");
}
}
public function LinkedClass(){
trace("hello");
}
}
2. Insert this to create a linkage identifier:
public static var id:String = "__Packages.net.nicoB.LinkedClass";
private static var _isSymbolLinked:Boolean =
Object.registerClass(id, LinkedClass);
private static var _isSymbolLinked:Boolean =
Object.registerClass(id, LinkedClass);
the id must be “__Packages”+full package name
3. Attach it as you would if it was in the library, by specifying the static property id:
import net.nicoB.LinkedClass;
var mcLinked : LinkedClass =
this.attachMovie(LinkedClass.id, "mcLinked", 1);
var mcLinked : LinkedClass =
this.attachMovie(LinkedClass.id, "mcLinked", 1);
That’s it. It’s easy, quick and useful!
September 26th, 2007 at 1:24 pm
Hello
it’s really not the better solution
The best solution is to use the __proto__ key word :
[code]
var mc:MovieClip = createEmptyMovieClip(”myClip”, 1 ) ;
mc.__proto__ = net.nicoB.LinkedClass.prototype ; // change the inherit
net.nicoB.LinkedClass.call(mc) ; // launch the constructor
[/code]
or with an attachMovie :
[code]
var mc:MovieClip = attachMovie(”mcLinked”, “myClip”, 1 ) ;
mc.__proto__ = net.nicoB.LinkedClass.prototype ; // change the inherit
net.nicoB.LinkedClass.call(mc) ; // launch the constructor
[/code]
In my framework i use a class to encapsulate this features :
http://svn1.cvsdude.com/osflash/vegas/AS2/trunk/src/vegas/util/factory/DisplayFactory.as
EKA+
September 29th, 2007 at 11:13 am
Thank you for the tip EKA.
Both methods are equivalent and lead to the same result.
April 9th, 2008 at 12:17 pm
“Both methods are equivalent and lead to the same result”
but the thing is which one is the best practise?
I agree with eka.. I belive that there are reason macromedia(now adobe) provide __proto__ key word –> it is to solve this situation
just my 2 cents