import 'package:flutter/material.dart';

import 'pages/page_a.dart';
import 'pages/page_b.dart';
import 'pages/page_c.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        appBarTheme: AppBarTheme(
          elevation: 0,
          iconTheme: IconThemeData(color: Colors.black),
          titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
        )
      ),
      home:  const HomePage(),
      onUnknownRoute: _onUnknownRoute,
    );
  }

  Route? _onUnknownRoute(RouteSettings settings) {
    String? name = settings.name;
    Widget? page ;
    if(name=='/a'){
      page = const PageA();
    }
    if(name=='/b'){
      page = const PageB();
    }
    if(name=='/c'){
      page = const PageC();
    }
    if(page!=null){
      return MaterialPageRoute(builder: (_)=> page!,settings: settings);
    }
    return null;
  }
}

class HomePage extends StatelessWidget {
  const HomePage({super.key});
  @override
  Widget build(BuildContext context) {
    const Color bgColor = Color(0xffCCFFFF);

    return Scaffold(
      backgroundColor: bgColor,
      appBar: AppBar(title: const Text('主页'),
        backgroundColor: bgColor,
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: ()=>toPageA(context),
          child: const Text('Push A'),
        ),
      ),
    );
  }

  void toPageA(BuildContext context){
    Navigator.of(context).pushNamed('/a');
  }
}