[ADF-2625] updating viewer on node editing (#3160)

* update viewer on metadata changes

* add test and docs

lib/core/services/alfresco-api.service.spec.ts

@@ -0,0 +1,39 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { AlfrescoApiService } from './alfresco-api.service';
+
+describe('AlfrescoApiService', () => {
+
+    let service: AlfrescoApiService;
+
+    beforeEach(() => {
+        service = new AlfrescoApiService(null, null);
+    });
+
+    it('should rase nodeChanged event with node payload', (done) => {
+        const node: any = {};
+
+        service.nodeUpdated.subscribe(result => {
+            expect(result).toEqual(node);
+            done();
+        });
+
+        service.nodeUpdated.next(node);
+    });
+
+});

lib/core/services/alfresco-api.service.ts

@@ -19,15 +19,21 @@ import { Injectable } from '@angular/core';
 import {
     AlfrescoApi, ContentApi, FavoritesApi, NodesApi,
     PeopleApi, RenditionsApi, SharedlinksApi, SitesApi,
-    VersionsApi, ClassesApi, SearchApi, GroupsApi
+    VersionsApi, ClassesApi, SearchApi, GroupsApi, MinimalNodeEntryEntity
 } from 'alfresco-js-api';
 import * as alfrescoApi from 'alfresco-js-api';
 import { AppConfigService } from '../app-config/app-config.service';
 import { StorageService } from './storage.service';
+import { Subject } from 'rxjs/Subject';
 
 @Injectable()
 export class AlfrescoApiService {
 
+    /**
+     * Publish/subscribe to events related to node updates.
+     */
+    nodeUpdated = new Subject<MinimalNodeEntryEntity>();
+
     protected alfrescoApi: AlfrescoApi;
 
     getInstance(): AlfrescoApi {

lib/core/viewer/components/viewer.component.ts

@@ -19,7 +19,7 @@ import { Location } from '@angular/common';
 import {
     Component, ContentChild, EventEmitter, HostListener, ElementRef,
     Input, OnChanges, Output, SimpleChanges, TemplateRef,
-    ViewEncapsulation
+    ViewEncapsulation, OnInit, OnDestroy
 } from '@angular/core';
 import { MinimalNodeEntryEntity, RenditionEntry } from 'alfresco-js-api';
 import { BaseEvent } from '../../events';
@@ -29,6 +29,7 @@ import { ViewerMoreActionsComponent } from './viewer-more-actions.component';
 import { ViewerOpenWithComponent } from './viewer-open-with.component';
 import { ViewerSidebarComponent } from './viewer-sidebar.component';
 import { ViewerToolbarComponent } from './viewer-toolbar.component';
+import { Subscription } from 'rxjs/Subscription';
 
 @Component({
     selector: 'adf-viewer',
@@ -37,7 +38,7 @@ import { ViewerToolbarComponent } from './viewer-toolbar.component';
     host: { 'class': 'adf-viewer' },
     encapsulation: ViewEncapsulation.None
 })
-export class ViewerComponent implements OnChanges {
+export class ViewerComponent implements OnChanges, OnInit, OnDestroy {
 
     @ContentChild(ViewerToolbarComponent)
     toolbar: ViewerToolbarComponent;
@@ -213,6 +214,8 @@ export class ViewerComponent implements OnChanges {
     extension: string;
     sidebarTemplateContext: { node: MinimalNodeEntryEntity } = { node: null };
 
+    private subscriptions: Subscription[] = [];
+
     // Extensions that are supported by the Viewer without conversion
     private extensions = {
         image: ['png', 'jpg', 'jpeg', 'gif', 'bpm', 'svg'],
@@ -239,6 +242,23 @@ export class ViewerComponent implements OnChanges {
         return (this.urlFile || this.blobFile || this.fileNodeId || this.sharedLinkId) ? true : false;
     }
 
+    ngOnInit() {
+        this.subscriptions = this.subscriptions.concat([
+            this.apiService.nodeUpdated.subscribe(node => this.onNodeUpdated(node))
+        ]);
+    }
+
+    ngOnDestroy() {
+        this.subscriptions.forEach(subscription => subscription.unsubscribe());
+        this.subscriptions = [];
+    }
+
+    private onNodeUpdated(node: MinimalNodeEntryEntity) {
+        if (node && node.id === this.fileNodeId) {
+            this.setUpNodeFile(node);
+        }
+    }
+
     ngOnChanges(changes: SimpleChanges) {
         if (this.showViewer) {
             if (!this.isSourceDefined()) {