/// <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 void OnMouseEvent(MouseHookEventArgs e)
{
MouseEvent?.Invoke(this, e);
}
private void OnWheel(MouseHookEventArgs e)
{
Wheel?.Invoke(this, e);
OnMouseEvent(e);
}
private void OnMiddleButtonUp(MouseHookEventArgs e)
{
MiddleButtonUp?.Invoke(this, e);
OnMouseEvent(e);
}
private void OnRightButtonUp(MouseHookEventArgs e)
{
RightButtonUp?.Invoke(this, e);
OnMouseEvent(e);
}
private void OnLeftButtonDown(MouseHookEventArgs e)
{
LeftButtonDown?.Invoke(this, e);
OnMouseEvent(e);
}
private static void TriggerMouseEvent(MouseHookEventArgs e, MouseEventNames name,
Action <MouseHookEventArgs> method)
{
e.MouseEventName = name;
method(e);
}