105 lines
3.1 KiB
C#
105 lines
3.1 KiB
C#
/*
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* Copyright (c) 2024 ETH Zürich, IT Services
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Windows.Forms;
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using System.Windows.Input;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.SystemComponents.Contracts.Keyboard;
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using SafeExamBrowser.SystemComponents.Contracts.Keyboard.Events;
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namespace SafeExamBrowser.SystemComponents.Keyboard
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{
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public class Keyboard : IKeyboard
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{
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private readonly IList<KeyboardLayout> layouts;
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private readonly ILogger logger;
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private InputLanguage originalLanguage;
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public event LayoutChangedEventHandler LayoutChanged;
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public Keyboard(ILogger logger)
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{
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this.layouts = new List<KeyboardLayout>();
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this.logger = logger;
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}
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public void ActivateLayout(Guid layoutId)
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{
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var layout = layouts.First(l => l.Id == layoutId);
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logger.Info($"Changing keyboard layout to {layout}...");
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InputLanguage.CurrentInputLanguage = layout.InputLanguage;
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layout.IsCurrent = true;
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LayoutChanged?.Invoke(layout);
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}
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public void Initialize()
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{
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originalLanguage = InputLanguage.CurrentInputLanguage;
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logger.Info($"Saved current keyboard layout {ToString(originalLanguage)}.");
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foreach (InputLanguage language in InputLanguage.InstalledInputLanguages)
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{
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var layout = new KeyboardLayout
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{
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CultureCode = language.Culture.ThreeLetterISOLanguageName.ToUpper(),
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CultureName = language.Culture.NativeName,
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InputLanguage = language,
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IsCurrent = originalLanguage.Equals(language),
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LayoutName = language.LayoutName
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};
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layouts.Add(layout);
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logger.Info($"Detected keyboard layout {layout}.");
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}
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InputLanguageManager.Current.InputLanguageChanged += InputLanguageManager_InputLanguageChanged;
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}
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public IEnumerable<IKeyboardLayout> GetLayouts()
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{
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return new List<KeyboardLayout>(layouts.OrderBy(l => l.CultureName));
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}
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public void Terminate()
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{
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InputLanguageManager.Current.InputLanguageChanged -= InputLanguageManager_InputLanguageChanged;
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if (originalLanguage != null)
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{
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InputLanguage.CurrentInputLanguage = originalLanguage;
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logger.Info($"Restored original keyboard layout {ToString(originalLanguage)}.");
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}
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}
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private void InputLanguageManager_InputLanguageChanged(object sender, InputLanguageEventArgs e)
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{
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var layout = layouts.First(l => l.InputLanguage.Culture.Equals(e.NewLanguage));
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logger.Info($"Detected keyboard layout change from {ToString(e.PreviousLanguage)} to {ToString(e.NewLanguage)}.");
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layout.IsCurrent = true;
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LayoutChanged?.Invoke(layout);
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}
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private string ToString(InputLanguage language)
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{
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return $"'{language.Culture.NativeName}' [{language.Culture.ThreeLetterISOLanguageName.ToUpper()}, {language.LayoutName}]";
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}
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private string ToString(CultureInfo culture)
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{
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return $"'{culture.NativeName}' [{culture.ThreeLetterISOLanguageName.ToUpper()}]";
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}
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}
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}
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