加载资源初步

src/core/common/disposable.ts

@@ -3,21 +3,33 @@ import { EmitableEvent, EventEmitter } from './eventEmitter';
 interface DisposableEvent<T> extends EmitableEvent {
     active: (value: T) => void;
     dispose: (value: T) => void;
+    destroy: () => void;
 }
 
 export class Disposable<T> extends EventEmitter<DisposableEvent<T>> {
-    protected _data: T;
+    protected _data?: T;
     set data(value: T | null) {
+        if (this.destroyed) {
+            throw new Error(
+                `Cannot set value of destroyed disposable variable.`
+            );
+        }
         if (value !== null) this._data = value;
     }
     get data(): T | null {
+        if (this.destroyed) {
+            throw new Error(
+                `Cannot get value of destroyed disposable variable.`
+            );
+        }
         if (!this.activated) {
             return null;
         }
-        return this._data;
+        return this._data!;
     }
 
     protected activated: boolean = false;
+    protected destroyed: boolean = false;
 
     constructor(data: T) {
         super();
@@ -26,11 +38,17 @@ export class Disposable<T> extends EventEmitter<DisposableEvent<T>> {
 
     active() {
         this.activated = true;
-        this.emit('active', this._data);
+        this.emit('active', this._data!);
     }
 
     dispose() {
         this.activated = false;
-        this.emit('dispose', this._data);
+        this.emit('dispose', this._data!);
+    }
+
+    destroy() {
+        this.destroyed = true;
+        this.emit('destroy');
+        delete this._data;
     }
 }