Integration beetwen Viewer and Activiti Content (#1765)

* Provide a FormService event when you click on the uploaded content

* Add a formContentClick event to the Form component

* Provide a way to pass Blob to viewer

* Provide a way to use the viewer using a Blob
 - Fix the pdf viewer
 - Fix the image viewer
 - Fix the media viewer

* Update the viewer documentation

* Use the ContentService provided by the core

* Fix and improve unit test

* Add unit test blob viewer

ng2-components/ng2-alfresco-viewer/src/components/mediaPlayer.component.ts

@@ -15,7 +15,8 @@
  * limitations under the License.
  */
 
-import { Component, Input } from '@angular/core';
+import { Component, Input, OnChanges, SimpleChanges } from '@angular/core';
+import { ContentService } from 'ng2-alfresco-core';
 
 @Component({
     moduleId: module.id,
@@ -23,21 +24,31 @@ import { Component, Input } from '@angular/core';
     templateUrl: './mediaPlayer.component.html',
     styleUrls: ['./mediaPlayer.component.css']
 })
-export class MediaPlayerComponent {
+export class MediaPlayerComponent implements OnChanges {
 
     @Input()
     urlFile: string;
 
+    @Input()
+    blobFile: Blob;
+
     @Input()
     mimeType: string;
 
     @Input()
     nameFile: string;
 
-    ngOnChanges(changes) {
-        if (!this.urlFile) {
-            throw new Error('Attribute urlFile is required');
+    constructor(private contentService: ContentService ) {}
+
+    ngOnChanges(changes: SimpleChanges) {
+        let blobFile = changes['blobFile'];
+        if (blobFile && blobFile.currentValue) {
+            this.urlFile = this.contentService.createTrustedUrl(this.blobFile);
+            return;
+        }
+
+        if (!this.urlFile && !this.blobFile) {
+            throw new Error('Attribute urlFile or blobFile is required');
         }
     }
-
 }