GlassNavigationShell class

Hosts navigation-bar glass chrome above the Navigator, so it stays pinned while route content slides during a push or pop.

This reproduces the iOS 26 navigation bar model, where bar items belong to the navigation stack rather than to any one screen. Apple documents the behaviour on UIBarButtonItem.identifier: "When the set of bar button items in a navigation bar or toolbar changes (for example, when pushing or popping view controllers), UIKit automatically animates the transition between the different sets of items."

Install it once, wrapping whatever Navigator your app builds. This works with the imperative Navigator and with any router built on the Pages API (go_router, auto_route, beamer), because the shell only ever reads ModalRoute animations — it never intercepts navigation:

CupertinoApp(
  builder: (context, child) => GlassNavigationShell(child: child!),
  home: const HomeScreen(),
);

// Or with a router:
CupertinoApp.router(
  routerConfig: router,
  builder: (context, child) => GlassNavigationShell(child: child!),
);

Screens opt in with the GlassAppBar.pinned constructor. Screens using the plain GlassAppBar are unaffected, and when no shell is present (or the device can't render the effect) pinned bars fall back to rendering the same buttons inside the route.

Inheritance

Constructors

GlassNavigationShell({Key? key, required Widget child, bool enabled = true, GlassEffectTransition effectTransition = GlassEffectTransition.materialize}): Creates a navigation shell around child.
const

Properties

child → Widget: The subtree containing the Navigator, typically the child handed to CupertinoApp.builder.
final
effectTransition → GlassEffectTransition: How chrome that appears or disappears across a transition animates — a back button on the first push off the root, an actions capsule on a route whose destination has none.
final
enabled → bool: Whether pinning is enabled at all.
final
hashCode → int: The hash code for this object.
no setterinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<GlassNavigationShell>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

maybeOf(BuildContext context) → GlassNavigationShellState?: The nearest enclosing shell, or null if there is none.