feat(window): add component instance property to window ref (#2858)

src/framework/theme/components/cdk/overlay/overlay-container.ts

@@ -148,7 +148,7 @@ export class NbOverlayContainerComponent {
       this.portalOutlet.detach();
     }
     this.attachStringContent(null);
-    this.isAttached = false
+    this.isAttached = false;
   }
 
   protected createChildInjector(cfr: ComponentFactoryResolver): NbPortalInjector {

src/framework/theme/components/window/window-ref.ts

@@ -7,9 +7,11 @@ import { NbWindowConfig, NbWindowState, NbWindowStateChange } from './window.opt
  * The `NbWindowRef` helps to manipulate window after it was created.
  * The window can be dismissed by using `close` method of the windowRef.
  * You can access rendered component as `componentRef` property of the windowRef.
+ * Property `contentInstance` contains the instance of the component opened in the window.
  */
-export class NbWindowRef {
+export class NbWindowRef<T = any> {
   componentRef: ComponentRef<NbWindowComponent>;
+  componentInstance: T;
 
   protected prevStateValue: NbWindowState;
   protected stateValue: NbWindowState;
@@ -83,6 +85,7 @@ export class NbWindowRef {
 
     this._closed = true;
     this.componentRef.destroy();
+    this.componentInstance = null;
     this.stateChange$.complete();
     this.closed$.next();
     this.closed$.complete();

src/framework/theme/components/window/window.component.ts

@@ -167,6 +167,8 @@ export class NbWindowComponent implements OnInit, AfterViewChecked, OnDestroy {
   protected attachComponent() {
     const portal = new NbComponentPortal(this.content as Type<any>, null, null, this.cfr);
     const ref = this.overlayContainer.attachComponentPortal(portal, this.context);
+    this.windowRef.componentInstance = ref.instance;
+
     ref.changeDetectorRef.detectChanges();
   }
 }