enabled property

Determine if the DropdownMenu is enabled.
Defaults to true.
This sample demonstrates how the enabled and requestFocusOnTap properties affect the textfield's hover cursor.
To see it in action, copy and run this code snippet on DartPad.
import 'package:collection/collection.dart';
import 'package:material_ui/material_ui.dart';

/// Flutter code sample for [DropdownMenu].

const List<String> list = <String>['One', 'Two', 'Three', 'Four'];

void main() => runApp(const DropdownMenuApp());

class DropdownMenuApp extends StatelessWidget {
  const DropdownMenuApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('DropdownMenu Sample')),
        body: const Center(child: DropdownMenuExample()),
      ),
    );
  }
}

class DropdownMenuExample extends StatefulWidget {
  const DropdownMenuExample({super.key});

  @override
  State<DropdownMenuExample> createState() => _DropdownMenuExampleState();
}

typedef MenuEntry = DropdownMenuEntry<String>;

class _DropdownMenuExampleState extends State<DropdownMenuExample> {
  static final List<MenuEntry> menuEntries = UnmodifiableListView<MenuEntry>(
    list.map<MenuEntry>((String name) => MenuEntry(value: name, label: name)),
  );
  String dropdownValue = list.first;

  @override
  Widget build(BuildContext context) {
    final ColorScheme colorScheme = Theme.of(context).colorScheme;

    return ListView(
      children: <Widget>[
        ListTile(
          tileColor: colorScheme.primaryContainer,
          title: const Column(
            crossAxisAlignment: .start,
            children: <Widget>[
              Text('enabled: true'),
              Text('requestFocusOnTap: true'),
            ],
          ),
          subtitle: Column(
            children: <Widget>[
              DropdownMenu<String>(
                requestFocusOnTap: true,
                initialSelection: list.first,
                expandedInsets: EdgeInsets.zero,
                onSelected: (String? value) {
                  setState(() {
                    dropdownValue = value!;
                  });
                },
                dropdownMenuEntries: menuEntries,
              ),
              const Text(
                'Text cursor is shown when hovering over the DropdownMenu.',
              ),
            ],
          ),
        ),
        const SizedBox(height: 20),
        ListTile(
          tileColor: colorScheme.primaryContainer,
          title: const Column(
            crossAxisAlignment: .start,
            children: <Widget>[
              Text('enabled: true'),
              Text('requestFocusOnTap: false'),
            ],
          ),
          subtitle: Column(
            children: <Widget>[
              DropdownMenu<String>(
                requestFocusOnTap: false,
                initialSelection: list.first,
                expandedInsets: EdgeInsets.zero,
                onSelected: (String? value) {
                  setState(() {
                    dropdownValue = value!;
                  });
                },
                dropdownMenuEntries: menuEntries,
              ),
              const Text(
                'Clickable cursor is shown when hovering over the DropdownMenu.',
              ),
            ],
          ),
        ),
        const SizedBox(height: 20),
        ListTile(
          tileColor: colorScheme.onInverseSurface,
          title: const Column(
            crossAxisAlignment: .start,
            children: <Widget>[
              Text('enabled: false'),
              Text('requestFocusOnTap: true'),
            ],
          ),
          subtitle: Column(
            children: <Widget>[
              DropdownMenu<String>(
                enabled: false,
                requestFocusOnTap: true,
                initialSelection: list.first,
                expandedInsets: EdgeInsets.zero,
                onSelected: (String? value) {
                  setState(() {
                    dropdownValue = value!;
                  });
                },
                dropdownMenuEntries: menuEntries,
              ),
              const Text(
                'Default cursor is shown when hovering over the DropdownMenu.',
              ),
            ],
          ),
        ),
        const SizedBox(height: 20),
        ListTile(
          tileColor: colorScheme.onInverseSurface,
          title: const Column(
            crossAxisAlignment: .start,
            children: <Widget>[
              Text('enabled: false'),
              Text('requestFocusOnTap: false'),
            ],
          ),
          subtitle: Column(
            children: <Widget>[
              DropdownMenu<String>(
                enabled: false,
                requestFocusOnTap: false,
                initialSelection: list.first,
                expandedInsets: EdgeInsets.zero,
                onSelected: (String? value) {
                  setState(() {
                    dropdownValue = value!;
                  });
                },
                dropdownMenuEntries: menuEntries,
              ),
              const Text(
                'Default cursor is shown when hovering over the DropdownMenu.',
              ),
            ],
          ),
        ),
      ],
    );
  }
}
Implementation

DropdownMenu class
