DeferredLoader class

Wrapper that loads a deferred library before rendering its child.

Used with Dart's deferred as imports to enable code splitting on web. The WASM/JS compiler splits each deferred import into a separate chunk (.part.wasm / .part.js) that is only downloaded when libraryLoader is called — i.e. when the user first navigates to the route that uses this widget.

On native platforms (iOS, Android, macOS, Windows, Linux), libraryLoader resolves instantly (no-op) so this widget is transparent.

Usage in a module's *_routes.dart:

import 'package:neom_core/ui/deferred_loader.dart';
import 'ui/erp_dashboard_page.dart' deferred as erp_dash;

class ErpRoutes {
  static List<SintPage> get routes => [
    SintPage(
      name: '/erp',
      page: () => DeferredLoader(
        erp_dash.loadLibrary,
        () => erp_dash.ErpDashboardPage(),
      ),
    ),
  ];
}

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• DeferredLoader

Constructors

DeferredLoader(Future<void> libraryLoader(), Widget builder(), {Key? key})

const

Properties

builder → Widget Function()

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

libraryLoader → Future<void> Function()

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

build(BuildContext context) → Widget

Describes the part of the user interface represented by this widget.

override

createElement() → StatelessElement

Creates a StatelessElement to manage this widget's location in the tree.

inherited

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