stack

Overview ¶

Package stack demonstrates a screen stack: how screens are pushed and popped, how data flows between them, and how a screen replaces itself.

Parent → child: via the constructor. cityList pushes newCityDetail(city).
Child → parent: via Pop(result). timezonePicker calls Pop(chosenTZ),
                which lands in cityDetail.OnEnter(chosenTZ).
Self → self:    via Replace. Both the list and the detail bind r to
                screen.Replace(fresh instance of themselves) — an atomic
                top-of-stack swap. Stack depth doesn't change, nothing
                flickers, and the screen underneath is untouched: its
                OnEnter does not fire. A pop+push would do both.

Each screen uses a different layout to show that the stack doesn't care what its children look like — it just hosts layout.Node trees.