gdk-sharp Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Gdk.Event Generated when the state of a toplevel window changes. Constructor raw unmanaged pointer. Internal constructor. None. Property Gdk.WindowState Mask specifying what flags have changed. Mask specifying what flags have changed. None. Property Gdk.WindowState The new window state. The new window state. None.