100 lines
2.9 KiB
C#
100 lines
2.9 KiB
C#
/*
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* Copyright (c) 2019 ETH Zürich, Educational Development and Technology (LET)
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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.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 IList<KeyboardLayout> layouts;
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private ILogger logger;
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private CultureInfo originalLanguage;
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public event KeyboardLayoutChangedEventHandler 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.FirstOrDefault(l => l.Id == layoutId);
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if (layout != default(KeyboardLayout))
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{
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logger.Info($"Changing keyboard layout to {ToString(layout.CultureInfo)}.");
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InputLanguageManager.Current.CurrentInputLanguage = layout.CultureInfo;
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}
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else
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{
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logger.Error($"Could not find keyboard layout with id '{layoutId}'!");
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}
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}
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public void Initialize()
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{
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originalLanguage = InputLanguageManager.Current.CurrentInputLanguage;
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logger.Info($"Saved current keyboard layout {ToString(originalLanguage)}.");
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foreach (CultureInfo info in InputLanguageManager.Current.AvailableInputLanguages)
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{
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var layout = new KeyboardLayout
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{
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CultureCode = info.ThreeLetterISOLanguageName.ToUpper(),
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CultureInfo = info,
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IsCurrent = originalLanguage.Equals(info),
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Name = info.NativeName
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};
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layouts.Add(layout);
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logger.Info($"Detected keyboard layout {ToString(info)}.");
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}
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InputLanguageManager.Current.InputLanguageChanged += Current_InputLanguageChanged;
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}
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public IEnumerable<IKeyboardLayout> GetLayouts()
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{
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return layouts;
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}
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public void Terminate()
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{
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InputLanguageManager.Current.InputLanguageChanged -= Current_InputLanguageChanged;
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if (originalLanguage != null)
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{
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InputLanguageManager.Current.CurrentInputLanguage = originalLanguage;
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logger.Info($"Restored original keyboard layout {ToString(originalLanguage)}.");
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}
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}
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private void Current_InputLanguageChanged(object sender, InputLanguageEventArgs e)
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{
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var layout = layouts.First(l => l.CultureInfo.Equals(e.NewLanguage));
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logger.Info($"Detected keyboard layout change from {ToString(e.PreviousLanguage)} to {ToString(e.NewLanguage)}.");
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LayoutChanged?.Invoke(layout);
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}
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private string ToString(CultureInfo info)
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{
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return $"'{info.DisplayName}' ({info.ThreeLetterISOLanguageName.ToUpper()})";
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}
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}
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}
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