[ADF-2755] Fix preview overlay (#3208)

* Fix overlay in the new sidenav

* Update wrong url

* Enrich BlobPreviewService

* Fix another previews

* Filepreview use the same router outlet

demo-shell/src/app/services/preview.service.ts

@@ -0,0 +1,38 @@
+/*!
+ * @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 { Injectable } from '@angular/core';
+import { Router } from '@angular/router';
+
+@Injectable()
+export class PreviewService {
+
+    public content: Blob = null;
+    public name: string = null;
+
+    constructor(private router: Router) {}
+
+    showResource(resourceId): void {
+        this.router.navigate([{ outlets: { overlay: ['files', resourceId, 'view'] } }]);
+    }
+
+    showBlob(name: string, content: Blob): void {
+        this.name = name;
+        this.content = content;
+        this.router.navigate([{ outlets: { overlay: ['preview', 'blob'] } }]);
+    }
+}