public static extern bool ClientToScreen(IntPtr hWnd, ref Win32Point lpPoint);
public static extern IntPtr WindowFromPoint(Win32Point pt);
// this accounts for the border and shadow. Serious fudgery here.
private static Int32Rect GetWindowActualRect(IntPtr hWnd)
{
Win32Rect windowRect = new Win32Rect();
Win32Rect clientRect = new Win32Rect();
User32.GetWindowRect(hWnd, out windowRect);
User32.GetClientRect(hWnd, out clientRect);
int sideBorder = (windowRect.Width - clientRect.Width)/2 + 1;
// sooo, yeah.
const int hackToAccountForShadow = 4;
Win32Point topLeftPoint = new Win32Point(windowRect.Left - sideBorder, windowRect.Top - sideBorder);
//User32.ClientToScreen(hWnd, ref topLeftPoint);
Int32Rect actualRect = new Int32Rect(
topLeftPoint.X,
topLeftPoint.Y,
windowRect.Width + sideBorder * 2 + hackToAccountForShadow,
windowRect.Height + sideBorder * 2 + hackToAccountForShadow);
return actualRect;
}