123 lines
3.5 KiB
C#
123 lines
3.5 KiB
C#
/*
|
|
* Copyright (c) 2019 ETH Zürich, Educational Development and Technology (LET)
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
|
|
using System;
|
|
using System.Runtime.InteropServices;
|
|
using System.Threading;
|
|
using System.Threading.Tasks;
|
|
using SafeExamBrowser.Contracts.Logging;
|
|
using SafeExamBrowser.Contracts.UserInterface.Shell;
|
|
using SafeExamBrowser.Contracts.UserInterface.Shell.Events;
|
|
using SafeExamBrowser.WindowsApi.Constants;
|
|
using SafeExamBrowser.WindowsApi.Delegates;
|
|
using SafeExamBrowser.WindowsApi.Types;
|
|
|
|
namespace SafeExamBrowser.WindowsApi
|
|
{
|
|
public class TouchActivator : IActionCenterActivator
|
|
{
|
|
private HookDelegate hookDelegate;
|
|
private IntPtr handle;
|
|
private bool isDown;
|
|
private ILogger logger;
|
|
|
|
public event ActivatorEventHandler Activate;
|
|
public event ActivatorEventHandler Deactivate { add { } remove { } }
|
|
public event ActivatorEventHandler Toggle { add { } remove { } }
|
|
|
|
public TouchActivator(ILogger logger)
|
|
{
|
|
this.logger = logger;
|
|
}
|
|
|
|
public void Start()
|
|
{
|
|
var hookReadyEvent = new AutoResetEvent(false);
|
|
var hookThread = new Thread(() =>
|
|
{
|
|
var sleepEvent = new AutoResetEvent(false);
|
|
var process = System.Diagnostics.Process.GetCurrentProcess();
|
|
var module = process.MainModule;
|
|
var moduleHandle = Kernel32.GetModuleHandle(module.ModuleName);
|
|
|
|
// IMPORTANT:
|
|
// Ensures that the hook delegate does not get garbage collected prematurely, as it will be passed to unmanaged code.
|
|
// Not doing so will result in a <c>CallbackOnCollectedDelegate</c> error and subsequent application crash!
|
|
hookDelegate = new HookDelegate(LowLevelMouseProc);
|
|
|
|
handle = User32.SetWindowsHookEx(HookType.WH_MOUSE_LL, hookDelegate, moduleHandle, 0);
|
|
hookReadyEvent.Set();
|
|
|
|
while (true)
|
|
{
|
|
sleepEvent.WaitOne();
|
|
}
|
|
});
|
|
|
|
hookThread.SetApartmentState(ApartmentState.STA);
|
|
hookThread.IsBackground = true;
|
|
hookThread.Start();
|
|
|
|
hookReadyEvent.WaitOne();
|
|
}
|
|
|
|
public void Stop()
|
|
{
|
|
User32.UnhookWindowsHookEx(handle);
|
|
}
|
|
|
|
private IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam)
|
|
{
|
|
if (nCode >= 0 && !Ignore(wParam.ToInt32()))
|
|
{
|
|
var message = wParam.ToInt32();
|
|
var mouseData = (MSLLHOOKSTRUCT) Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
|
|
var position = $"{mouseData.Point.X}/{mouseData.Point.Y}";
|
|
var extraInfo = mouseData.DwExtraInfo.ToUInt32();
|
|
var isTouch = (extraInfo & Constant.MOUSEEVENTF_MASK) == Constant.MOUSEEVENTF_FROMTOUCH;
|
|
var inActivationArea = 0 < mouseData.Point.X && mouseData.Point.X < 100;
|
|
|
|
if (isTouch)
|
|
{
|
|
if (message == Constant.WM_LBUTTONUP)
|
|
{
|
|
isDown = false;
|
|
}
|
|
|
|
if (message == Constant.WM_LBUTTONDOWN && inActivationArea)
|
|
{
|
|
isDown = true;
|
|
Task.Delay(100).ContinueWith(_ => CheckPosition());
|
|
}
|
|
}
|
|
}
|
|
|
|
return User32.CallNextHookEx(handle, nCode, wParam, lParam);
|
|
}
|
|
|
|
private void CheckPosition()
|
|
{
|
|
var position = new POINT();
|
|
var hasMoved = position.X > 200;
|
|
|
|
User32.GetCursorPos(ref position);
|
|
|
|
if (isDown && hasMoved)
|
|
{
|
|
logger.Debug("Detected activation gesture for action center.");
|
|
Activate?.Invoke();
|
|
}
|
|
}
|
|
|
|
private bool Ignore(int wParam)
|
|
{
|
|
// For performance reasons, ignore mouse movement and wheel rotation...
|
|
return wParam == Constant.WM_MOUSEMOVE || wParam == Constant.WM_MOUSEWHEEL;
|
|
}
|
|
}
|
|
}
|