Class Observer
{
Private function observer () {}
//Methods
PUBLIC FUNCTION UPDATE (): Void {};
}
Class Subject
{
// fields
Private var observers: array = new array ();
Private function subject ()
{
}
//Methods
Public Function Attach (OBServer: Observer): Void
{
Observers.push (Observer);
}
Public Function DETACH (OBSERVER: OBSERVER): Void
{
Observers.shift (OBServer);
}
Public function notify (): void
{
// trace (observers);
For (var i = 0; i { Observers [i] .update (); } } } Class ConcreteobServer Extends Observer { // fields Private var name: String; Private var observerstate: string; PRIVATE VAR SUBJECT: CONCRESUBJECT; // conntructors Public Function ConcreteobServer (Sub: ConcreteSubject, N: String) { Subject = SUB; Name = n; // trace (SUBJECT ":" N); } //Methods Public function update (): void { //trace(Subject.SubjectState; Observerstate = Subject.subjectState; "Observer" Name "'s new state is" observerstate); } // Properties Public function get subject (): concreteSubject { Return Subject; } Public Function Set Subject (Value: ConcreteSubject): VoID { Subject = Value; } } Class ConcreeSubject Extends Subject { // fields PRIVATE VAR SUBJECTSTATATE: STRING; Public function get SubjectState (): String { Return SubjectState; } Public Function Set SubjectState (Value: String): Void { SubjectState = Value; } } //client.fla Var s: ConcreteSubject = New ConcReSubject (); S.Attach (New ConcreteobServer (S, "X")); S.Attach (New Concreteobserver (S, "Y")); S.Attach (New Concreteobserver (S, Z ")); // Change Subject and Notify Observers S.SUBJECTSTATE = "abc"; s.Notify (); // Output: // Observer x's new state is abc // Observer Y's New State Is Abc // Observer Z's New State Is Abc This mode is too important, MVC is often used! It is generally the action of monitoring the view, change the Model via Control.
