/// <summary>
/// Hook into the windows eventqueue for mouse events
/// </summary>
/// <returns></returns>
public int SetHook()
{
hProc = new Win32Api.HookProc(MouseHookProc);
hHook = Win32Api.SetWindowsHookEx(WH_MOUSE_LL, hProc, IntPtr.Zero, 0);
return(hHook);
}
/// <summary>
/// When stopping, unhook to release resources.
/// </summary>
public void UnHook()
{
Win32Api.UnhookWindowsHookEx(hHook);
}
/// <summary>
/// This is the code hooked into the windows event queue that receives the messages
/// </summary>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
private int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
Win32Api.MouseHookStruct MyMouseHookStruct = (Win32Api.MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(Win32Api.MouseHookStruct));
// Pass this message up the chain. If false, eat the message.
bool sendup = true;
//Debug.WriteLine(string.Format("{0}", wParam));
if (nCode < 0)
{
return(Win32Api.CallNextHookEx(hHook, nCode, wParam, lParam));
}
else
{
// send mouse events to subscribed code.
// They tell us if we should eat it or pass it along.
if (MouseClickEvent != null)
{
MouseButtons button = MouseButtons.None;
int clickCount = 0;
switch ((Int32)wParam)
{
case WM_LBUTTONDOWN:
button = MouseButtons.Left;
clickCount = 1;
sendup = MouseDownEvent(this, new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo));
break;
case WM_RBUTTONDOWN:
button = MouseButtons.Right;
clickCount = 1;
sendup = MouseDownEvent(this, new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo));
break;
case WM_MBUTTONDOWN:
button = MouseButtons.Middle;
clickCount = 1;
sendup = MouseDownEvent(this, new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo));
break;
case WM_LBUTTONUP:
button = MouseButtons.Left;
clickCount = 1;
sendup = MouseUpEvent(this, new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo));
break;
case WM_RBUTTONUP:
button = MouseButtons.Right;
clickCount = 1;
sendup = MouseUpEvent(this, new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo));
break;
case WM_MBUTTONUP:
button = MouseButtons.Middle;
clickCount = 1;
sendup = MouseUpEvent(this, new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo));
break;
}
var e = new APIMouseEventArgs(button, clickCount, point.X, point.Y, 0, MyMouseHookStruct.dwExtraInfo);
MouseClickEvent(this, e);
}
if (sendup)
{
this.Point = new Point(MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y);
this.dwExtraInfo = MyMouseHookStruct.dwExtraInfo;
return(Win32Api.CallNextHookEx(hHook, nCode, wParam, lParam));
}
return(0);
}
}
