Merge pull request #46 from maxisam/feature/singleton_pattern

Feature/singleton pattern

src/clipboard.directive.spec.ts

@@ -33,7 +33,7 @@ describe('Directive: clipboard', () => {
       declarations: [TestClipboardComponent],
       imports: [
         BrowserModule,
-        ClipboardModule.forRoot(),
+        ClipboardModule,
         FormsModule]
     });
   });

src/clipboard.service.ts

@@ -1,8 +1,8 @@
-import { element } from 'protractor';
 import { WindowSrv } from './window.service';
-import { Inject, Injectable, Renderer } from '@angular/core';
+import { Inject, InjectionToken, Injectable, Optional, Renderer, SkipSelf } from '@angular/core';
 import { DOCUMENT } from '@angular/platform-browser';
 
+
 @Injectable()
 export class ClipboardService {
     private tempTextArea: HTMLTextAreaElement;
@@ -101,3 +101,13 @@ export class ClipboardService {
         return ta;
     }
 }
+// this pattern is mentioned in https://github.com/angular/angular/issues/13854 in #43
+export function CLIPBOARD_SERVICE_PROVIDER_FACTORY(doc, windowSrv: WindowSrv, parentDispatcher: ClipboardService) {
+    return parentDispatcher || new ClipboardService(doc, windowSrv);
+};
+
+export const CLIPBOARD_SERVICE_PROVIDER = {
+    provide: ClipboardService,
+    deps: [DOCUMENT, WindowSrv, [new Optional(), new SkipSelf(), ClipboardService]],
+    useFactory: CLIPBOARD_SERVICE_PROVIDER_FACTORY
+};

src/index.ts

@@ -1,21 +1,15 @@
-import { CommonModule } from '@angular/common';
 import { WindowSrv } from './window.service';
-import { ClipboardService } from './clipboard.service';
-import { ModuleWithProviders, NgModule } from '@angular/core';
 import { ClipboardDirective } from './clipboard.directive';
+import { CLIPBOARD_SERVICE_PROVIDER } from './clipboard.service';
+import { CommonModule } from '@angular/common';
+import { NgModule } from '@angular/core';
 export * from './clipboard.directive';
 export * from './clipboard.service';
 
 @NgModule({
     declarations: [ClipboardDirective],
     exports: [ClipboardDirective],
-    imports: [CommonModule]
+    imports: [CommonModule],
+    providers: [WindowSrv, CLIPBOARD_SERVICE_PROVIDER]
 })
-export class ClipboardModule {
-    public static forRoot(): ModuleWithProviders {
-        return {
-            ngModule: ClipboardModule,
-            providers: [ClipboardService, WindowSrv]
-        };
-    }
-}
+export class ClipboardModule { }