refactor(event_manager): use multi bindings to configure EventManager

Closes #3978

modules/angular2/src/core/application_common.ts

@@ -39,7 +39,11 @@ import {NgZone} from 'angular2/src/core/zone/ng_zone';
 import {LifeCycle} from 'angular2/src/core/life_cycle/life_cycle';
 import {XHR} from 'angular2/src/core/render/xhr';
 import {XHRImpl} from 'angular2/src/core/render/xhr_impl';
-import {EventManager, DomEventsPlugin} from 'angular2/src/core/render/dom/events/event_manager';
+import {
+  EventManager,
+  DomEventsPlugin,
+  EVENT_MANAGER_PLUGINS
+} from 'angular2/src/core/render/dom/events/event_manager';
 import {KeyEventsPlugin} from 'angular2/src/core/render/dom/events/key_events';
 import {HammerGesturesPlugin} from 'angular2/src/core/render/dom/events/hammer_gestures';
 import {ComponentUrlMapper} from 'angular2/src/core/compiler/component_url_mapper';
@@ -111,14 +115,10 @@ function _injectorBindings(appComponentType): Array<Type | Binding | any[]> {
         .toFactory((p: Promise<any>) => p.then(ref => ref.instance), [APP_COMPONENT_REF_PROMISE]),
     bind(LifeCycle).toFactory((exceptionHandler) => new LifeCycle(null, assertionsEnabled()),
                               [ExceptionHandler]),
-    bind(EventManager)
-        .toFactory(
-            (ngZone) => {
-              var plugins =
-                  [new HammerGesturesPlugin(), new KeyEventsPlugin(), new DomEventsPlugin()];
-              return new EventManager(plugins, ngZone);
-            },
-            [NgZone]),
+    EventManager,
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: DomEventsPlugin, multi: true}),
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: KeyEventsPlugin, multi: true}),
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: HammerGesturesPlugin, multi: true}),
     DomRenderer,
     bind(Renderer).toAlias(DomRenderer),
     APP_ID_RANDOM_BINDING,

modules/angular2/src/core/render/dom/events/event_manager.ts

@@ -1,12 +1,25 @@
-import {isBlank, BaseException, isPresent, StringWrapper} from 'angular2/src/core/facade/lang';
+import {
+  isBlank,
+  BaseException,
+  isPresent,
+  StringWrapper,
+  CONST_EXPR
+} from 'angular2/src/core/facade/lang';
+import {ListWrapper} from 'angular2/src/core/facade/collection';
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 import {NgZone} from 'angular2/src/core/zone/ng_zone';
+import {Injectable, Inject, OpaqueToken} from 'angular2/di';
 
+export const EVENT_MANAGER_PLUGINS: OpaqueToken =
+    CONST_EXPR(new OpaqueToken("EventManagerPlugins"));
+
+@Injectable()
 export class EventManager {
-  constructor(public _plugins: EventManagerPlugin[], public _zone: NgZone) {
-    for (var i = 0; i < _plugins.length; i++) {
-      _plugins[i].manager = this;
-    }
+  private _plugins: EventManagerPlugin[];
+
+  constructor(@Inject(EVENT_MANAGER_PLUGINS) plugins: EventManagerPlugin[], private _zone: NgZone) {
+    plugins.forEach(p => p.manager = this);
+    this._plugins = ListWrapper.reversed(plugins);
   }
 
   addEventListener(element: HTMLElement, eventName: string, handler: Function) {
@@ -48,6 +61,7 @@ export class EventManagerPlugin {
   }
 }
 
+@Injectable()
 export class DomEventsPlugin extends EventManagerPlugin {
   manager: EventManager;
 
@@ -56,16 +70,16 @@ export class DomEventsPlugin extends EventManagerPlugin {
   supports(eventName: string): boolean { return true; }
 
   addEventListener(element: HTMLElement, eventName: string, handler: Function) {
-    var zone = this.manager._zone;
+    var zone = this.manager.getZone();
     var outsideHandler = (event) => zone.run(() => handler(event));
-    this.manager._zone.runOutsideAngular(() => { DOM.on(element, eventName, outsideHandler); });
+    this.manager.getZone().runOutsideAngular(() => { DOM.on(element, eventName, outsideHandler); });
   }
 
   addGlobalEventListener(target: string, eventName: string, handler: Function): Function {
     var element = DOM.getGlobalEventTarget(target);
-    var zone = this.manager._zone;
+    var zone = this.manager.getZone();
     var outsideHandler = (event) => zone.run(() => handler(event));
-    return this.manager._zone.runOutsideAngular(
+    return this.manager.getZone().runOutsideAngular(
         () => { return DOM.onAndCancel(element, eventName, outsideHandler); });
   }
 }

modules/angular2/src/core/render/dom/events/hammer_gestures.dart

@@ -3,9 +3,11 @@ library angular.events;
 import 'dart:html';
 import './hammer_common.dart';
 import 'package:angular2/src/core/facade/lang.dart' show BaseException;
+import "package:angular2/di.dart" show Injectable;
 
 import 'dart:js' as js;
 
+@Injectable()
 class HammerGesturesPlugin extends HammerGesturesPluginCommon {
   bool supports(String eventName) {
     if (!super.supports(eventName)) return false;

modules/angular2/src/core/render/dom/events/hammer_gestures.ts

@@ -2,10 +2,10 @@
 
 import {HammerGesturesPluginCommon} from './hammer_common';
 import {isPresent, BaseException} from 'angular2/src/core/facade/lang';
+import {Injectable} from 'angular2/di';
 
+@Injectable()
 export class HammerGesturesPlugin extends HammerGesturesPluginCommon {
-  constructor() { super(); }
-
   supports(eventName: string): boolean {
     if (!super.supports(eventName)) return false;
 

modules/angular2/src/core/render/dom/events/key_events.ts

@@ -10,6 +10,7 @@ import {
 import {StringMapWrapper, ListWrapper} from 'angular2/src/core/facade/collection';
 import {EventManagerPlugin} from './event_manager';
 import {NgZone} from 'angular2/src/core/zone/ng_zone';
+import {Injectable} from 'angular2/di';
 
 var modifierKeys = ['alt', 'control', 'meta', 'shift'];
 var modifierKeyGetters: StringMap<string, Function> = {
@@ -19,6 +20,7 @@ var modifierKeyGetters: StringMap<string, Function> = {
   'shift': (event) => event.shiftKey
 };
 
+@Injectable()
 export class KeyEventsPlugin extends EventManagerPlugin {
   constructor() { super(); }
 

modules/angular2/src/test_lib/test_injector.ts

@@ -30,7 +30,11 @@ import {NgZone} from 'angular2/src/core/zone/ng_zone';
 
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 
-import {EventManager, DomEventsPlugin} from 'angular2/src/core/render/dom/events/event_manager';
+import {
+  EventManager,
+  DomEventsPlugin,
+  EVENT_MANAGER_PLUGINS
+} from 'angular2/src/core/render/dom/events/event_manager';
 
 import {MockViewResolver} from 'angular2/src/mock/view_resolver_mock';
 import {MockXHR} from 'angular2/src/core/render/xhr_mock';
@@ -144,15 +148,8 @@ function _getAppBindings() {
     StyleInliner,
     TestComponentBuilder,
     bind(NgZone).toClass(MockNgZone),
-    bind(EventManager)
-        .toFactory(
-            (zone) => {
-              var plugins = [
-                new DomEventsPlugin(),
-              ];
-              return new EventManager(plugins, zone);
-            },
-            [NgZone]),
+    EventManager,
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: DomEventsPlugin, multi: true})
   ];
 }
 

modules/angular2/src/web_workers/ui/di_bindings.ts

@@ -11,7 +11,11 @@ import {
   PreGeneratedChangeDetection
 } from 'angular2/src/core/change_detection/change_detection';
 import {DEFAULT_PIPES} from 'angular2/pipes';
-import {EventManager, DomEventsPlugin} from 'angular2/src/core/render/dom/events/event_manager';
+import {
+  EventManager,
+  DomEventsPlugin,
+  EVENT_MANAGER_PLUGINS
+} from 'angular2/src/core/render/dom/events/event_manager';
 import {Compiler, CompilerCache} from 'angular2/src/core/compiler/compiler';
 import {BrowserDomAdapter} from 'angular2/src/core/dom/browser_adapter';
 import {KeyEventsPlugin} from 'angular2/src/core/render/dom/events/key_events';
@@ -87,14 +91,10 @@ function _injectorBindings(): any[] {
   return [
     bind(DOCUMENT)
         .toValue(DOM.defaultDoc()),
-    bind(EventManager)
-        .toFactory(
-            (ngZone) => {
-              var plugins =
-                  [new HammerGesturesPlugin(), new KeyEventsPlugin(), new DomEventsPlugin()];
-              return new EventManager(plugins, ngZone);
-            },
-            [NgZone]),
+    EventManager,
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: DomEventsPlugin, multi: true}),
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: KeyEventsPlugin, multi: true}),
+    new Binding(EVENT_MANAGER_PLUGINS, {toClass: HammerGesturesPlugin, multi: true}),
     DomRenderer,
     bind(Renderer).toAlias(DomRenderer),
     APP_ID_RANDOM_BINDING,

modules/angular2/test/core/render/dom/events/event_manager_spec.ts

@@ -25,14 +25,15 @@ export function main() {
 
   describe('EventManager', () => {
 
-    it('should delegate event bindings to plugins', () => {
-      var element = el('<div></div>');
-      var handler = (e) => e;
-      var plugin = new FakeEventManagerPlugin(['click']);
-      var manager = new EventManager([plugin, domEventPlugin], new FakeNgZone());
-      manager.addEventListener(element, 'click', handler);
-      expect(plugin._eventHandler.get('click')).toBe(handler);
-    });
+    it('should delegate event bindings to plugins that are passed in from the most generic one to the most specific one',
+       () => {
+         var element = el('<div></div>');
+         var handler = (e) => e;
+         var plugin = new FakeEventManagerPlugin(['click']);
+         var manager = new EventManager([domEventPlugin, plugin], new FakeNgZone());
+         manager.addEventListener(element, 'click', handler);
+         expect(plugin._eventHandler.get('click')).toBe(handler);
+       });
 
     it('should delegate event bindings to the first plugin supporting the event', () => {
       var element = el('<div></div>');
@@ -40,7 +41,7 @@ export function main() {
       var dblClickHandler = (e) => e;
       var plugin1 = new FakeEventManagerPlugin(['dblclick']);
       var plugin2 = new FakeEventManagerPlugin(['click', 'dblclick']);
-      var manager = new EventManager([plugin1, plugin2], new FakeNgZone());
+      var manager = new EventManager([plugin2, plugin1], new FakeNgZone());
       manager.addEventListener(element, 'click', clickHandler);
       manager.addEventListener(element, 'dblclick', dblClickHandler);
       expect(plugin1._eventHandler.has('click')).toBe(false);