theme init

src/app/layout/app.menu.service.ts

@@ -0,0 +1,23 @@
+import { Injectable } from '@angular/core';
+import { Subject } from 'rxjs';
+import { MenuChangeEvent } from './api/menuchangeevent';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class MenuService {
+
+    private menuSource = new Subject<MenuChangeEvent>();
+    private resetSource = new Subject();
+
+    menuSource$ = this.menuSource.asObservable();
+    resetSource$ = this.resetSource.asObservable();
+
+    onMenuStateChange(event: MenuChangeEvent) {
+        this.menuSource.next(event);
+    }
+
+    reset() {
+        this.resetSource.next(true);
+    }
+}