upper property
List<GlassProxyFrame?>
get
upper
The proxies of glass that stands on glass, by level: upper[0] is what
the surfaces one glass deep sample, and so on up.
A level apart from frame rather than more slots in it, because what a
level captures contains the level below it drawn — the lens over a tab
bar has to see the bar's glass and its icons — so it can only be recorded
once the level below has been published. See GlassHost for the walk.
Implementation
List<GlassProxyFrame?> get upper => _upper;