pinnedActions property

Trailing bar items declared as data, pinned above the Navigator by an enclosing GlassNavigationShell.

Set by GlassAppBar.pinned (its actions parameter, defaulting to empty) and always null for the widget-based constructor — the constructor choice is what decides whether the bar participates in pinning. When a shell is present these items stay put during push and pop while the page slides beneath them, morphing in place into the next route's items; without a shell they render inside this bar as a normal glass capsule.