NativeMethods.RECT CalcParentWindowRect(IntPtr hwnd)
{
var adjustRect = new NativeMethods.RECT();
var style = UnsafeNativeMethods.GetWindowLong(hwnd, NativeMethods.GWL_STYLE);
var exStyle = UnsafeNativeMethods.GetWindowLong(hwnd, NativeMethods.GWL_EXSTYLE);
UnsafeNativeMethods.AdjustWindowRectEx(ref adjustRect, style & ~NativeMethods.WS_CAPTION, 0, exStyle);
var windowRect = new NativeMethods.RECT();
UnsafeNativeMethods.GetWindowRect(hwnd, ref windowRect);
windowRect.left -= adjustRect.left;
windowRect.top -= adjustRect.top;
windowRect.right -= adjustRect.right;
windowRect.bottom -= adjustRect.bottom;
return(windowRect);
}
