User Guide

Object 559
The following trace statement shows how you can use the prototype property and the
__proto__ property together to move two levels up the inheritance hierarchy (or prototype
chain). The
Circle.prototype.__proto__ property contains a reference to the superclass of
the Shape class.
trace(Circle.prototype.__proto__ == Shape.prototype); // Output: true
See also
__proto__ (Object.__proto__ property)
registerClass (Object.registerClass method)
public static registerClass(name:String, theClass:Function) : Boolean
Associates a movie clip symbol with an ActionScript object class. If a symbol doesn't exist,
Flash creates an association between a string identifier and an object class.
When an instance of the specified movie clip symbol is placed on the Timeline, it is registered
to the class specified by the
theClass parameter rather than to the class MovieClip.
When an instance of the specified movie clip symbol is created by using
MovieClip.attachMovie() or MovieClip.duplicateMovieClip(), it is registered to the
class specified by
theClass rather than to the MovieClip class. If theClass is null, this
method removes any ActionScript class definition associated with the specified movie clip
symbol or class identifier. For movie clip symbols, any existing instances of the movie clip
remain unchanged, but new instances of the symbol are associated with the default class
MovieClip.
If a symbol is already registered to a class, this method replaces it with the new registration.
When a movie clip instance is placed by the Timeline or created using
attachMovie() or
duplicateMovieClip(), ActionScript invokes the constructor for the appropriate class with
the keyword
this pointing to the object. The constructor function is invoked with no
parameters.
If you use this method to register a movie clip with an ActionScript class other than
MovieClip, the movie clip symbol doesn't inherit the methods, properties, and events of the
built-in MovieClip class unless you include the MovieClip class in the prototype chain of the
new class. The following code creates a new ActionScript class called
theClass that inherits
the properties of the MovieClip class:
theClass.prototype = new MovieClip();
Availability: ActionScript 1.0; Flash Lite 2.0 - If you are using ActionScript 2.0 classes, you
can use the ActionScript 2.0 Class field in the Linkage Properties or Symbol Properties dialog
box to associate an object with a class instead of using this method.