120 lines
2.6 KiB
C#
120 lines
2.6 KiB
C#
/*
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* Copyright (c) 2022 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 TaskviewKeyboardActivator : KeyboardActivator, ITaskviewActivator
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{
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private bool Activated, LeftShift, Tab;
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private ILogger logger;
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public event ActivatorEventHandler Deactivated;
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public event ActivatorEventHandler NextActivated;
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public event ActivatorEventHandler PreviousActivated;
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public TaskviewKeyboardActivator(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 OnBeforePause()
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{
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if (Activated)
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{
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logger.Debug("Auto-deactivation.");
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Deactivated?.Invoke();
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}
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Activated = false;
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}
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protected override void OnBeforeResume()
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{
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Activated = false;
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LeftShift = false;
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Tab = 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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if (IsDeactivation(modifier))
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{
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return false;
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}
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if (IsActivation(key, modifier, state))
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{
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return true;
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}
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return false;
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}
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private bool IsActivation(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 && modifier.HasFlag(KeyModifier.Alt);
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switch (key)
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{
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case Key.Tab:
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changed = Tab != pressed;
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Tab = pressed;
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break;
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case Key.LeftShift:
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changed = LeftShift != pressed;
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LeftShift = pressed;
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break;
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}
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var isActivation = Tab && changed;
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if (isActivation)
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{
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Activated = true;
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if (LeftShift)
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{
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logger.Debug("Detected sequence for previous instance.");
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PreviousActivated?.Invoke();
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}
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else
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{
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logger.Debug("Detected sequence for next instance.");
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NextActivated?.Invoke();
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}
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}
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return isActivation;
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}
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private bool IsDeactivation(KeyModifier modifier)
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{
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var isDeactivation = Activated && !modifier.HasFlag(KeyModifier.Alt);
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if (isDeactivation)
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{
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Activated = false;
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LeftShift = false;
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Tab = false;
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logger.Debug("Detected deactivation sequence.");
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Deactivated?.Invoke();
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}
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return isDeactivation;
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}
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}
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}
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