69 lines
1.7 KiB
C#
69 lines
1.7 KiB
C#
/*
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* Copyright (c) 2021 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.Windows.Input;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.UserInterface.Contracts.Shell;
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using SafeExamBrowser.UserInterface.Contracts.Shell.Events;
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using SafeExamBrowser.WindowsApi.Contracts;
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using SafeExamBrowser.WindowsApi.Contracts.Events;
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namespace SafeExamBrowser.UserInterface.Shared.Activators
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{
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public class TerminationActivator : KeyboardActivator, ITerminationActivator
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{
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private bool Q, LeftCtrl, RightCtrl;
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private ILogger logger;
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public event ActivatorEventHandler Activated;
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public TerminationActivator(ILogger logger, INativeMethods nativeMethods) : base(nativeMethods)
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{
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this.logger = logger;
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}
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protected override void OnBeforeResume()
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{
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Q = false;
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LeftCtrl = false;
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RightCtrl = false;
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}
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protected override bool Process(Key key, KeyModifier modifier, KeyState state)
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{
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var changed = false;
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var pressed = state == KeyState.Pressed;
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switch (key)
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{
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case Key.Q:
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changed = Q != pressed;
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Q = pressed;
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break;
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case Key.LeftCtrl:
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changed = LeftCtrl != pressed;
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LeftCtrl = pressed;
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break;
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case Key.RightCtrl:
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changed = RightCtrl != pressed;
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RightCtrl = pressed;
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break;
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}
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if (Q && (LeftCtrl || RightCtrl) && changed && !modifier.HasFlag(KeyModifier.Alt))
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{
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logger.Debug("Detected termination sequence.");
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Activated?.Invoke();
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return true;
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}
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return false;
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}
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}
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}
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