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196 lines (162 loc) · 6 KB
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using System;
using System.Runtime.InteropServices;
using Process.NET.Applied;
using Process.NET.Native;
using Process.NET.Native.Types;
namespace Process.NET.Windows.Mouse
{
public enum HookEventType
{
Keyboard,
Mouse
}
public sealed class MouseHook : IApplied
{
private readonly LowLevelProc _callback;
private IntPtr _hookId;
public MouseHook(string identifier)
{
Identifier = identifier;
_callback = MouseHookCallback;
}
public bool IsEnabled { get; private set; }
public bool IsDisposed { get; set; }
public bool MustBeDisposed { get; set; } = true;
public string Identifier { get; }
public void Enable()
{
_hookId = User32.SetWindowsHook(HookType.WH_MOUSE_LL, _callback);
IsEnabled = true;
}
public void Disable()
{
if (!IsEnabled) return;
User32.UnhookWindowsHookEx(_hookId);
IsEnabled = false;
}
/// <summary>
/// This is the callback method that is called whenever a low level mouse event is triggered.
/// We use it to call our individual custom events.
/// </summary>
private IntPtr MouseHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
var lParamStruct = (MSLLHOOKSTRUCT) Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
var e = new MouseHookEventArgs(lParamStruct);
switch ((MouseMessages) wParam)
{
case MouseMessages.WmMouseMove:
TriggerMouseEvent(e, MouseEventNames.MouseMove, OnMove);
break;
case MouseMessages.WmLButtonDown:
TriggerMouseEvent(e, MouseEventNames.LeftButtonDown, OnLeftButtonDown);
break;
case MouseMessages.WmLButtonUp:
TriggerMouseEvent(e, MouseEventNames.LeftButtonUp, OnLeftButtonUp);
break;
case MouseMessages.WmRButtonDown:
TriggerMouseEvent(e, MouseEventNames.RightButtonDown, OnRightButtonDown);
break;
case MouseMessages.WmRButtonUp:
TriggerMouseEvent(e, MouseEventNames.RightButtonUp, OnRightButtonUp);
break;
case MouseMessages.WmMButtonDown:
TriggerMouseEvent(e, MouseEventNames.MiddleButtonDown, OnMiddleButtonDown);
break;
case MouseMessages.WmMButtonUp:
TriggerMouseEvent(e, MouseEventNames.MouseMove, OnMove);
e.MouseEventName = MouseEventNames.MiddleButtonUp;
OnMiddleButtonUp(e);
break;
case MouseMessages.WmMouseWheel:
TriggerMouseEvent(e, MouseEventNames.MouseMove, OnMove);
e.MouseEventName = MouseEventNames.MouseWheel;
OnWheel(e);
break;
}
}
return (IntPtr) User32.CallNextHookEx(_hookId, nCode, wParam, lParam);
}
private static void TriggerMouseEvent(MouseHookEventArgs e, MouseEventNames name,
Action<MouseHookEventArgs> method)
{
e.MouseEventName = name;
method(e);
}
#region Custom Events
public event EventHandler<MouseHookEventArgs> Move;
private void OnMove(MouseHookEventArgs e)
{
Move?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> LeftButtonDown;
private void OnLeftButtonDown(MouseHookEventArgs e)
{
LeftButtonDown?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> LeftButtonUp;
private void OnLeftButtonUp(MouseHookEventArgs e)
{
LeftButtonUp?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> RightButtonDown;
private void OnRightButtonDown(MouseHookEventArgs e)
{
RightButtonDown?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> RightButtonUp;
private void OnRightButtonUp(MouseHookEventArgs e)
{
RightButtonUp?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> MiddleButtonDown;
private void OnMiddleButtonDown(MouseHookEventArgs e)
{
MiddleButtonDown?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> MiddleButtonUp;
private void OnMiddleButtonUp(MouseHookEventArgs e)
{
MiddleButtonUp?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> Wheel;
private void OnWheel(MouseHookEventArgs e)
{
Wheel?.Invoke(this, e);
OnMouseEvent(e);
}
public event EventHandler<MouseHookEventArgs> MouseEvent;
private void OnMouseEvent(MouseHookEventArgs e)
{
MouseEvent?.Invoke(this, e);
}
#endregion
#region IDisposable Members / Finalizer
/// <summary>
/// Call this method to unhook the Mouse Hook, and to release resources allocated to it.
/// </summary>
public void Dispose()
{
if (IsDisposed)
return;
IsDisposed = true;
if (IsEnabled)
Disable();
GC.SuppressFinalize(this);
}
~MouseHook()
{
if (MustBeDisposed)
Disable();
}
#endregion
}
}