upload button enhancements (#1835)

- add support for [disabled] attribute
- move to angular/material icons
- improve demo shell layout (files.component)

ng2-components/ng2-alfresco-upload/src/components/upload-button.component.ts

@@ -56,6 +56,9 @@ export class UploadButtonComponent implements OnInit, OnChanges {
 
     private static DEFAULT_ROOT_ID: string = '-root-';
 
+    @Input()
+    disabled: boolean = false;
+
     @Input()
     showNotificationBar: boolean = true;
 
@@ -96,7 +99,6 @@ export class UploadButtonComponent implements OnInit, OnChanges {
     permissionEvent: EventEmitter<PermissionModel> = new EventEmitter<PermissionModel>();
 
     private disableButton: boolean = false;
-
     private permissionValue: Subject<boolean> = new Subject<boolean>();
 
     constructor(private el: ElementRef,
@@ -109,6 +111,10 @@ export class UploadButtonComponent implements OnInit, OnChanges {
         }
     }
 
+    isDisabled(): boolean {
+        return this.disabled || this.disableButton;
+    }
+
     ngOnInit() {
         this.permissionValue.subscribe((hasPermission: boolean) => {
             if (!hasPermission && this.disableWithNoPermission) {