Restore SEBPatch

SafeExamBrowser.SystemComponents/Keyboard/Keyboard.cs

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+/*
+ * 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.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Forms;
+using System.Windows.Input;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.SystemComponents.Contracts.Keyboard;
+using SafeExamBrowser.SystemComponents.Contracts.Keyboard.Events;
+
+namespace SafeExamBrowser.SystemComponents.Keyboard
+{
+	public class Keyboard : IKeyboard
+	{
+		private readonly IList<KeyboardLayout> layouts;
+		private readonly ILogger logger;
+
+		private InputLanguage originalLanguage;
+
+		public event LayoutChangedEventHandler LayoutChanged;
+
+		public Keyboard(ILogger logger)
+		{
+			this.layouts = new List<KeyboardLayout>();
+			this.logger = logger;
+		}
+
+		public void ActivateLayout(Guid layoutId)
+		{
+			var layout = layouts.First(l => l.Id == layoutId);
+
+			logger.Info($"Changing keyboard layout to {layout}...");
+			InputLanguage.CurrentInputLanguage = layout.InputLanguage;
+
+			layout.IsCurrent = true;
+			LayoutChanged?.Invoke(layout);
+		}
+
+		public void Initialize()
+		{
+			originalLanguage = InputLanguage.CurrentInputLanguage;
+			logger.Info($"Saved current keyboard layout {ToString(originalLanguage)}.");
+
+			foreach (InputLanguage language in InputLanguage.InstalledInputLanguages)
+			{
+				var layout = new KeyboardLayout
+				{
+					CultureCode = language.Culture.ThreeLetterISOLanguageName.ToUpper(),
+					CultureName = language.Culture.NativeName,
+					InputLanguage = language,
+					IsCurrent = originalLanguage.Equals(language),
+					LayoutName = language.LayoutName
+				};
+
+				layouts.Add(layout);
+				logger.Info($"Detected keyboard layout {layout}.");
+			}
+
+			InputLanguageManager.Current.InputLanguageChanged += InputLanguageManager_InputLanguageChanged;
+		}
+
+		public IEnumerable<IKeyboardLayout> GetLayouts()
+		{
+			return new List<KeyboardLayout>(layouts.OrderBy(l => l.CultureName));
+		}
+
+		public void Terminate()
+		{
+			InputLanguageManager.Current.InputLanguageChanged -= InputLanguageManager_InputLanguageChanged;
+
+			if (originalLanguage != null)
+			{
+				InputLanguage.CurrentInputLanguage = originalLanguage;
+				logger.Info($"Restored original keyboard layout {ToString(originalLanguage)}.");
+			}
+		}
+
+		private void InputLanguageManager_InputLanguageChanged(object sender, InputLanguageEventArgs e)
+		{
+			var layout = layouts.First(l => l.InputLanguage.Culture.Equals(e.NewLanguage));
+
+			logger.Info($"Detected keyboard layout change from {ToString(e.PreviousLanguage)} to {ToString(e.NewLanguage)}.");
+			layout.IsCurrent = true;
+			LayoutChanged?.Invoke(layout);
+		}
+
+		private string ToString(InputLanguage language)
+		{
+			return $"'{language.Culture.NativeName}' [{language.Culture.ThreeLetterISOLanguageName.ToUpper()}, {language.LayoutName}]";
+		}
+
+		private string ToString(CultureInfo culture)
+		{
+			return $"'{culture.NativeName}' [{culture.ThreeLetterISOLanguageName.ToUpper()}]";
+		}
+	}
+}

SafeExamBrowser.SystemComponents/Keyboard/KeyboardLayout.cs

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+/*
+ * 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.Windows.Forms;
+using SafeExamBrowser.SystemComponents.Contracts.Keyboard;
+
+namespace SafeExamBrowser.SystemComponents.Keyboard
+{
+	internal class KeyboardLayout : IKeyboardLayout
+	{
+		internal InputLanguage InputLanguage { get; set; }
+
+		public string CultureCode { get; set; }
+		public string CultureName { get; set; }
+		public Guid Id { get; }
+		public bool IsCurrent { get; set; }
+		public string LayoutName { get; set; }
+
+		public KeyboardLayout()
+		{
+			Id = Guid.NewGuid();
+		}
+
+		public override string ToString()
+		{
+			return $"'{CultureName}' [{CultureCode}, {LayoutName}]";
+		}
+	}
+}