fix(dynamic overlay): recreate overlay when overlay container change

src/framework/theme/components/cdk/adapter/adapter.module.ts

@@ -1,6 +1,7 @@
 import { ModuleWithProviders, NgModule } from '@angular/core';
 import { OverlayContainer, ScrollDispatcher, ScrollStrategyOptions } from '@angular/cdk/overlay';
 
+import { NbOverlayContainer } from '../overlay/mapping';
 import { NbOverlayContainerAdapter } from './overlay-container-adapter';
 import { NbScrollDispatcherAdapter } from './scroll-dispatcher-adapter';
 import { NbViewportRulerAdapter } from './viewport-ruler-adapter';
@@ -17,6 +18,7 @@ export class NbCdkAdapterModule {
         NbOverlayContainerAdapter,
         NbBlockScrollStrategyAdapter,
         { provide: OverlayContainer, useExisting: NbOverlayContainerAdapter },
+        { provide: NbOverlayContainer, useExisting: NbOverlayContainerAdapter },
         { provide: ScrollDispatcher, useClass: NbScrollDispatcherAdapter },
         { provide: ScrollStrategyOptions, useClass: NbScrollStrategyOptions },
       ],

src/framework/theme/components/cdk/overlay/dynamic/dynamic-overlay.spec.ts

@@ -6,7 +6,7 @@ import { ScrollStrategy } from '@angular/cdk/overlay';
 import { NbDynamicOverlay } from './dynamic-overlay';
 import { NbOverlayService } from '../overlay-service';
 import { NbRenderableContainer } from '../overlay-container';
-import { NbComponentPortal, NbOverlayConfig } from '../mapping';
+import { NbComponentPortal, NbOverlayConfig, NbOverlayContainer } from '../mapping';
 
 @Component({ template: '' })
 export class NbDynamicOverlayMockComponent implements NbRenderableContainer {
@@ -75,6 +75,12 @@ const scrollStrategies = {
   reposition: () => (<unknown> repositionRes) as ScrollStrategy,
 };
 
+export class NbOverlayContainerMock {
+  getContainerElement() {
+    return { contains() { return true; } };
+  }
+}
+
 export class NbOverlayServiceMock {
   _config: NbOverlayConfig;
 
@@ -114,6 +120,7 @@ describe('dynamic-overlay', () => {
         NbDynamicOverlay,
         { provide: NbOverlayService, useClass: NbOverlayServiceMock },
         { provide: NgZone, useClass: MockNgZone },
+        { provide: NbOverlayContainer, useClass: NbOverlayContainerMock },
       ],
     });
     overlayService = bed.get(NbOverlayService);
@@ -199,7 +206,7 @@ describe('dynamic-overlay', () => {
     expect(createOverlaySpy).toHaveBeenCalledTimes(1);
   });
 
-  it('should not attache to ref if already shown', () => {
+  it('should not attach to ref if already shown', () => {
     const attachSpy = spyOn(ref, 'attach').and.callThrough();
     const hasAttacheSpy = spyOn(ref, 'hasAttached');
 
@@ -375,4 +382,36 @@ describe('dynamic-overlay', () => {
     expect(updatePositionSpy).toHaveBeenCalledTimes(1);
   });
 
+  it(`should recreate overlay if it's host isn't child of overlay container`, () => {
+    dynamicOverlay.show();
+    dynamicOverlay.hide();
+
+    const overlayContainer = TestBed.get(NbOverlayContainer);
+    const getContainerElementSpy = spyOn(overlayContainer, 'getContainerElement').and.returnValues(
+      { contains() { return false; } },
+      { contains() { return true; } },
+    );
+
+    dynamicOverlay.show();
+
+    expect(getContainerElementSpy).toHaveBeenCalledTimes(2);
+  });
+
+  it(`should dispose overlay ref when recreating overlay`, () => {
+    const disposeSpy = spyOn(ref, 'dispose').and.callThrough();
+
+    dynamicOverlay.show();
+    dynamicOverlay.hide();
+
+    const overlayContainer = TestBed.get(NbOverlayContainer);
+    // return false once to force overlay ref recreation and then always return true
+    overlayContainer.getContainerElement = () => {
+      overlayContainer.getContainerElement = () => ({ contains: () => true });
+      return { contains: () => false };
+    };
+
+    dynamicOverlay.show();
+
+    expect(disposeSpy).toHaveBeenCalledTimes(1);
+  });
 });

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

@@ -9,7 +9,7 @@ import {
 
 import { NbRenderableContainer } from '../overlay-container';
 import { createContainer, NbOverlayContent, NbOverlayService, patch } from '../overlay-service';
-import { NbOverlayRef } from '../mapping';
+import { NbOverlayRef, NbOverlayContainer } from '../mapping';
 
 export interface NbDynamicOverlayController {
   show();
@@ -36,9 +36,10 @@ export class NbDynamicOverlay {
   }
 
   constructor(
-    private overlay: NbOverlayService,
-    private componentFactoryResolver: ComponentFactoryResolver,
-    private zone: NgZone) {
+    protected overlay: NbOverlayService,
+    protected componentFactoryResolver: ComponentFactoryResolver,
+    protected zone: NgZone,
+    protected overlayContainer: NbOverlayContainer) {
   }
 
   create(componentType: Type<NbRenderableContainer>,
@@ -113,6 +114,12 @@ export class NbDynamicOverlay {
     }
 
     this.renderContainer();
+
+    if (!this.hasOverlayInContainer()) {
+      // Dispose overlay ref as it refers to the old overlay container and create new by calling `show`
+      this.disposeOverlayRef();
+      return this.show();
+    }
   }
 
   hide() {
@@ -135,10 +142,7 @@ export class NbDynamicOverlay {
   dispose() {
     this.alive = false;
     this.hide();
-    if (this.ref) {
-      this.ref.dispose();
-      this.ref = null;
-    }
+    this.disposeOverlayRef();
   }
 
   getContainer() {
@@ -187,4 +191,16 @@ export class NbDynamicOverlay {
         this.ref && this.ref.updatePosition();
       });
   }
+
+  protected hasOverlayInContainer(): boolean {
+    return this.overlayContainer.getContainerElement().contains(this.ref.hostElement);
+  }
+
+  protected disposeOverlayRef() {
+    if (this.ref) {
+      this.ref.dispose();
+      this.ref = null;
+      this.container = null;
+    }
+  }
 }