122 lines
3.5 KiB
C#
122 lines
3.5 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.Runtime.InteropServices;
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using System.Threading;
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using System.Threading.Tasks;
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using SafeExamBrowser.Contracts.Logging;
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using SafeExamBrowser.Contracts.UserInterface.Shell;
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using SafeExamBrowser.Contracts.UserInterface.Shell.Events;
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using SafeExamBrowser.WindowsApi.Constants;
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using SafeExamBrowser.WindowsApi.Delegates;
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using SafeExamBrowser.WindowsApi.Types;
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namespace SafeExamBrowser.WindowsApi
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{
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public class TouchActivator : IActionCenterActivator
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{
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private HookDelegate hookDelegate;
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private IntPtr handle;
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private bool isDown;
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private ILogger logger;
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public event ActivatorEventHandler Activated;
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public event ActivatorEventHandler Deactivated { add { } remove { } }
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public event ActivatorEventHandler Toggled { add { } remove { } }
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public TouchActivator(ILogger logger)
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{
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this.logger = logger;
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}
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public void Start()
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{
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var hookReadyEvent = new AutoResetEvent(false);
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var hookThread = new Thread(() =>
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{
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var sleepEvent = new AutoResetEvent(false);
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var process = System.Diagnostics.Process.GetCurrentProcess();
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var module = process.MainModule;
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var moduleHandle = Kernel32.GetModuleHandle(module.ModuleName);
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// IMPORTANT:
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// Ensures that the hook delegate does not get garbage collected prematurely, as it will be passed to unmanaged code.
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// Not doing so will result in a <c>CallbackOnCollectedDelegate</c> error and subsequent application crash!
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hookDelegate = new HookDelegate(LowLevelMouseProc);
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handle = User32.SetWindowsHookEx(HookType.WH_MOUSE_LL, hookDelegate, moduleHandle, 0);
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hookReadyEvent.Set();
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while (true)
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{
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sleepEvent.WaitOne();
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}
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});
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hookThread.SetApartmentState(ApartmentState.STA);
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hookThread.IsBackground = true;
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hookThread.Start();
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hookReadyEvent.WaitOne();
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}
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public void Stop()
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{
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User32.UnhookWindowsHookEx(handle);
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}
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private IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam)
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{
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if (nCode >= 0 && !Ignore(wParam.ToInt32()))
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{
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var message = wParam.ToInt32();
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var mouseData = (MSLLHOOKSTRUCT) Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
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var position = $"{mouseData.Point.X}/{mouseData.Point.Y}";
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var extraInfo = mouseData.DwExtraInfo.ToUInt32();
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var isTouch = (extraInfo & Constant.MOUSEEVENTF_MASK) == Constant.MOUSEEVENTF_FROMTOUCH;
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var inActivationArea = 0 < mouseData.Point.X && mouseData.Point.X < 100;
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if (isTouch)
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{
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if (message == Constant.WM_LBUTTONUP)
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{
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isDown = false;
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}
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if (message == Constant.WM_LBUTTONDOWN && inActivationArea)
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{
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isDown = true;
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Task.Delay(100).ContinueWith(_ => CheckPosition());
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}
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}
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}
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return User32.CallNextHookEx(handle, nCode, wParam, lParam);
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}
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private void CheckPosition()
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{
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var position = new POINT();
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User32.GetCursorPos(ref position);
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var hasMoved = position.X > 200;
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if (isDown && hasMoved)
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{
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logger.Debug("Detected activation gesture for action center.");
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Activated?.Invoke();
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}
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}
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private bool Ignore(int wParam)
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{
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// For performance reasons, ignore mouse movement and wheel rotation...
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return wParam == Constant.WM_MOUSEMOVE || wParam == Constant.WM_MOUSEWHEEL;
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}
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}
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}
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