emitter 支持 context

demo/libs/framework/framework.d.ts

@@ -1044,10 +1044,15 @@ declare class DrawUtils {
 declare class Emitter<T> {
     private _messageTable;
     constructor();
-    addObserver(eventType: T, handler: Function): void;
+    addObserver(eventType: T, handler: Function, context: any): void;
     removeObserver(eventType: T, handler: Function): void;
     emit(eventType: T, data?: any): void;
 }
+declare class FuncPack {
+    func: Function;
+    context: any;
+    constructor(func: Function, context: any);
+}
 declare class GlobalManager {
     static globalManagers: GlobalManager[];
     private _enabled;

demo/libs/framework/framework.js

@@ -4880,7 +4880,7 @@ var Emitter = (function () {
     function Emitter() {
         this._messageTable = new Map();
     }
-    Emitter.prototype.addObserver = function (eventType, handler) {
+    Emitter.prototype.addObserver = function (eventType, handler, context) {
         var list = this._messageTable.get(eventType);
         if (!list) {
             list = [];
@@ -4888,7 +4888,7 @@ var Emitter = (function () {
         }
         if (list.contains(handler))
             console.warn("您试图添加相同的观察者两次");
-        list.push(handler);
+        list.push(new FuncPack(handler, context));
     };
     Emitter.prototype.removeObserver = function (eventType, handler) {
         this._messageTable.get(eventType).remove(handler);
@@ -4897,11 +4897,18 @@ var Emitter = (function () {
         var list = this._messageTable.get(eventType);
         if (list) {
             for (var i = list.length - 1; i >= 0; i--)
-                list[i](data);
+                list[i].func.call(list[i].context, data);
         }
     };
     return Emitter;
 }());
+var FuncPack = (function () {
+    function FuncPack(func, context) {
+        this.func = func;
+        this.context = context;
+    }
+    return FuncPack;
+}());
 var GlobalManager = (function () {
     function GlobalManager() {
     }