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Kelvin Jou's questions

Martin Hope
Kelvin Jou
Asked: 2025-04-02 10:08:01 +0800 CST
  • 5

Tenho brincado com os componentes Flutter ShadCN recentemente e não consegui integrar o código de exemplo Tabs da documentação no código boilerplate ShadCN fornecido a nós aqui.

Eu simplesmente peguei o

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following assertion was thrown building ShadTabs<String>(dirty, dependencies:
[UnmanagedRestorationScope], state: ShadTabsState<String>#57a89):
ShadTheme.of() called with a context that does not contain a ShadTheme.

    No ShadTheme ancestor could be found starting from the context that was passed to

ShadTheme.of().
This can happen because you do not have a ShadApp widget (which introduces a ShadTheme),
or it can happen if the context you use comes from a widget above this widget.

    The context used was: ShadTabs<String>(dirty, dependencies: [UnmanagedRestorationScope],

state: ShadTabsState<String>#57a89)

A única linha que alterei do código boilerplate foi que comentei Padding of child e substituí por const TabsExample()(Meu TabsExamplewidget foi copiado e colado diretamente da documentação de exemplo de guias )

import 'package:flutter/services.dart';
import 'package:flutter_test_1/screens/home_tabs.dart';
import 'package:shadcn_flutter/shadcn_flutter.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setSystemUIOverlayStyle(
      const SystemUiOverlayStyle(systemNavigationBarColor: Colors.transparent));
  SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return ShadcnApp(
      title: 'My App',
      home: const TabsExample(),
      theme: ThemeData(
        colorScheme: ColorSchemes.darkZinc(),
        radius: 0.7,
      ),
    );
  }
}

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

  @override
  _CounterPageState createState() => _CounterPageState();
}

class _CounterPageState extends State<CounterPage> {
  int _counter = 0;

  int _selected = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  NavigationItem _buildButton(String label, IconData icon) {
    return NavigationItem(
      label: Text(label),
      child: Icon(icon),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      headers: [
        AppBar(
          title: const Text('Counter App'),
          subtitle: const Text('Testing features'),
          leading: [
            GhostButton(
              onPressed: () {
                openDrawer(
                  context: context,
                  builder: (context) {
                    return Container(
                      alignment: Alignment.center,
                      constraints: const BoxConstraints(
                        maxWidth: 300,
                      ),
                      child: const Text('Drawer'),
                    );
                  },
                  position: OverlayPosition.left,
                );
              },
              density: ButtonDensity.icon,
              child: const Icon(Icons.menu),
            ),
          ],
          trailing: [
            GhostButton(
              density: ButtonDensity.icon,
              onPressed: () {
                openSheet(
                  context: context,
                  builder: (context) {
                    return Container(
                      alignment: Alignment.center,
                      constraints: const BoxConstraints(
                        maxWidth: 200,
                      ),
                      child: const Text('Sheet'),
                    );
                  },
                  position: OverlayPosition.right,
                );
              },
              child: const Icon(Icons.search),
            ),
          ],
        ),
        const Divider(),
      ],
      footers: [
        const Divider(),
        NavigationBar(
          onSelected: (i) {
            setState(() {
              _selected = i;
            });
          },
          index: _selected,
          children: [
            _buildButton('Home', Icons.home),
            _buildButton('Explore', Icons.explore),
            _buildButton('Library', Icons.library_music),
          ],
        ),
      ],
      child: 
      const TabsExample()
      // Padding(
      //   padding: const EdgeInsets.all(32.0),
      //   child: Center(
      //     child: Column(
      //       mainAxisAlignment: MainAxisAlignment.center,
      //       children: <Widget>[
      //         const Text(
      //           'You have pushed the button this many times:',
      //           textAlign: TextAlign.center,
      //         ).p(),
      //         Text(
      //           '$_counter',
      //         ).h1(),
      //         PrimaryButton(
      //           onPressed: _incrementCounter,
      //           density: ButtonDensity.icon,
      //           child: const Icon(Icons.add),
      //         ).p(),
      //       ],
      //     ),
      //   ),
      // ),
    );
  }
}

O que deu errado?

flutter