/// <summary>
/// Iterate the windows, from top to bottom
/// </summary>
/// <param name="parent">InteropWindow as the parent, to iterate over the children, or null for all</param>
/// <returns>IEnumerable with all the top level windows</returns>
public static IEnumerable <IInteropWindow> GetTopWindows(IInteropWindow parent = null)
{
// TODO: Guard against looping
var windowPtr = parent == null?User32Api.GetTopWindow(IntPtr.Zero) : User32Api.GetWindow(parent.Handle, GetWindowCommands.GW_CHILD);
do
{
yield return(InteropWindowFactory.CreateFor(windowPtr));
windowPtr = User32Api.GetWindow(windowPtr, GetWindowCommands.GW_HWNDNEXT);
} while (windowPtr != IntPtr.Zero);
}