public CaptureRegion(formCallBack fcb)
{
this.fcb = fcb;
InitializeComponent();
this.TopMost = true;
this.Hide();
_callback = this.MouseMoveCallBack;
this.BackColor = Color.Aqua;
this.TransparencyKey = Color.Aqua;
this.Width = 0;
this.Height = 0;
_hook = MouseHook.SetWindowsHookEx(MouseHook.HookType.WH_MOUSE_LL, _callback, MouseHook.GetModuleHandle("user32"), 0);
if (_hook == IntPtr.Zero)
{
throw new System.ComponentModel.Win32Exception();
}
}
private IntPtr MouseMoveCallBack(int code, IntPtr wParam, IntPtr lParam)
{
if (code >= 0)
{
var WM_Code = (MouseHook.WM_Codes)wParam;
var mouseInfo = Marshal.PtrToStructure <MouseHook.MOUSEHOOKSTRUCT>(lParam);
if (WM_Code == MouseHook.WM_Codes.WM_MOUSEMOVE)
{
OnMouseMove(mouseInfo);
}
if (WM_Code == MouseHook.WM_Codes.WM_LBUTTONDOWN)
{
OnLBtnClick();
}
if (WM_Code == MouseHook.WM_Codes.WM_LBUTTONUP)
{
OnLBtnUp();
}
}
return(MouseHook.CallNextHookEx(IntPtr.Zero, code, wParam, lParam));
}
private void OnLBtnUp()
{
fcb(new Tuple <Point, Size>(new Point(this.Left, this.Top), Size));
MouseHook.UnhookWindowsHookEx(_hook);
this.Close();
}