From f5b237293b6e79299ec62a6ff2dabc762e963385 Mon Sep 17 00:00:00 2001
From: "Hawdziejuk, Kamil" <Kamil.Hawdziejuk@hidglobal.com>
Date: Mon, 19 Sep 2022 23:28:15 -0700
Subject: [PATCH] * implementing turning off camera (setting deviceId to null;
 showWebcam to false; and most importantly releasing resources by calling
 nextWebcam.complete() on a subject) * adding unit test

---
 src/app/app.component.spec.ts | 17 +++++++++++++++++
 src/app/app.component.ts      |  9 +++++++++
 2 files changed, 26 insertions(+)

diff --git a/src/app/app.component.spec.ts b/src/app/app.component.spec.ts
index 6879b0e..5695e62 100644
--- a/src/app/app.component.spec.ts
+++ b/src/app/app.component.spec.ts
@@ -15,15 +15,32 @@ describe('AppComponent', () => {
       ]
     }).compileComponents();
   }));
+
   it('should create the app', waitForAsync(() => {
     const fixture = TestBed.createComponent(AppComponent);
     const app = fixture.debugElement.componentInstance;
     expect(app).toBeTruthy();
   }));
+
   it('should render title in a h1 tag', waitForAsync(() => {
     const fixture = TestBed.createComponent(AppComponent);
     fixture.detectChanges();
     const compiled = fixture.debugElement.nativeElement;
     expect(compiled.querySelector('h1').textContent).toContain('ngx-webcam Demo');
   }));
+
+  it('closing camera connection when turning off camera', waitForAsync(() => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.debugElement.componentInstance;
+    app.deviceId = '111';
+    app.showWebcam = true;
+    const compiled = fixture.debugElement.nativeElement;
+
+    app.turnOffCamera();
+
+    expect(app.deviceId).toBeNull();
+    expect(app.showWebcam).toBeFalse();
+    expect(compiled.querySelector('webcam')).toBeNull();
+  }));
+
 });
diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index f500bb0..95950b2 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -36,6 +36,15 @@ export class AppComponent implements OnInit {
 
   public toggleWebcam(): void {
     this.showWebcam = !this.showWebcam;
+    if (!this.showWebcam) {
+      this.turnOffCamera();
+    }
+  }
+
+  public turnOffCamera(): void {
+    this.deviceId = null;
+    this.showWebcam = false;
+    this.nextWebcam.complete();
   }
 
   public handleInitError(error: WebcamInitError): void {