128 lines
3.6 KiB
C#
128 lines
3.6 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.Contracts.I18n;
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using SafeExamBrowser.Contracts.Logging;
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using SafeExamBrowser.Contracts.SystemComponents;
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using SafeExamBrowser.Contracts.UserInterface.Shell;
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namespace SafeExamBrowser.SystemComponents
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{
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public class KeyboardLayout : ISystemComponent<ISystemKeyboardLayoutControl>
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{
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private const int TWO_SECONDS = 2000;
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private KeyboardLayoutDefinition currentLayout;
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private IList<KeyboardLayoutDefinition> layouts;
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private ILogger logger;
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private CultureInfo originalLanguage;
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private IList<ISystemKeyboardLayoutControl> controls;
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private IText text;
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public KeyboardLayout(ILogger logger, IText text)
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{
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this.controls = new List<ISystemKeyboardLayoutControl>();
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this.layouts = new List<KeyboardLayoutDefinition>();
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this.logger = logger;
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this.text = text;
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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($"Saved current keyboard layout {ToString(originalLanguage)}.");
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foreach (CultureInfo info in InputLanguageManager.Current.AvailableInputLanguages)
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{
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var layout = new KeyboardLayoutDefinition
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{
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CultureCode = info.ThreeLetterISOLanguageName.ToUpper(),
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CultureInfo = info,
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Name = info.NativeName
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};
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if (originalLanguage.Equals(info))
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{
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currentLayout = layout;
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}
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layouts.Add(layout);
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logger.Info($"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 void Register(ISystemKeyboardLayoutControl control)
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{
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foreach (var layout in layouts)
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{
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control.Add(layout);
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}
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control.LayoutSelected += Control_LayoutSelected;
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control.SetCurrent(currentLayout);
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control.SetInformation(GetInfoTextFor(currentLayout));
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controls.Add(control);
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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($"Restored original keyboard layout {ToString(originalLanguage)}.");
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}
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foreach (var control in controls)
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{
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control.Close();
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}
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}
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private void Control_LayoutSelected(Guid id)
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{
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var layout = layouts.First(l => l.Id == id);
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logger.Info($"Changing keyboard layout to {ToString(layout.CultureInfo)}.");
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InputLanguageManager.Current.CurrentInputLanguage = layout.CultureInfo;
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}
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private void Current_InputLanguageChanged(object sender, InputLanguageEventArgs e)
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{
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var newLayout = 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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currentLayout = newLayout;
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foreach (var control in controls)
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{
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control.SetCurrent(newLayout);
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control.SetInformation(GetInfoTextFor(newLayout));
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}
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}
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private string GetInfoTextFor(KeyboardLayoutDefinition layout)
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{
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return text.Get(TextKey.SystemControl_KeyboardLayoutTooltip).Replace("%%LAYOUT%%", layout.CultureInfo.NativeName);
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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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