1 files changed, 47 insertions, 0 deletions
diff --git a/src/app/services/loading-indicator.service.ts b/src/app/services/loading-indicator.service.ts
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+++ b/src/app/services/loading-indicator.service.ts
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+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+import { BehaviorSubject, Observable } from 'rxjs';
+import { debounceTime } from 'rxjs/operators';
+
+@Injectable()
+export class LoadingIndicatorService {
+  private isVisible$ = new BehaviorSubject<boolean>(false);
+  private timeDelay = 500;
+  private counter = 0;
+
+  show(): void {
+    this.counter++;
+    if (this.counter > 0) {
+      setTimeout(() => this.isVisible$.next(true), 0);
+    }
+  }
+
+  hide(): void {
+    this.counter--;
+    if (this.counter === 0) {
+      setTimeout(() => this.isVisible$.next(false), 0);
+    }
+  }
+
+  isVisible(): Observable<boolean> {
+    return this.isVisible$.pipe(debounceTime(this.timeDelay));
+  }
+}