Restore SEBPatch

SafeExamBrowser.UserInterface.Desktop/ViewModels/DateTimeViewModel.cs

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System;
+using System.ComponentModel;
+using System.Windows.Threading;
+
+namespace SafeExamBrowser.UserInterface.Desktop.ViewModels
+{
+	internal class DateTimeViewModel : INotifyPropertyChanged
+	{
+		private DispatcherTimer timer;
+		private readonly bool showSeconds;
+
+		public string Date { get; private set; }
+		public string Time { get; private set; }
+		public string ToolTip { get; private set; }
+
+		public event PropertyChangedEventHandler PropertyChanged;
+
+		public DateTimeViewModel(bool showSeconds)
+		{
+			this.showSeconds = showSeconds;
+			this.timer = new DispatcherTimer();
+			this.timer.Interval = TimeSpan.FromMilliseconds(250);
+			this.timer.Tick += Timer_Tick;
+			this.timer.Start();
+		}
+
+		private void Timer_Tick(object sender, EventArgs e)
+		{
+			var date = DateTime.Now;
+
+			Date = date.ToShortDateString();
+			Time = showSeconds ? date.ToLongTimeString() : date.ToShortTimeString();
+			ToolTip = $"{date.ToLongDateString()} {date.ToLongTimeString()}";
+
+			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Time)));
+			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Date)));
+			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ToolTip)));
+		}
+	}
+}