yumi0629/part_navigator_page.dart

## part_navigator_page.dart
import 'package:flutter/material.dart';

class PartNavigatorPage extends StatefulWidget {
  final Map<String, WidgetBuilder> routes;
  final Widget home;

  const PartNavigatorPage({Key key, this.routes, this.home}) : super(key: key);

  @override
  State<StatefulWidget> createState() => PartNavigatorState();
}

class PartNavigatorState extends State<PartNavigatorPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('PartNavigator'),
      ),
      body: Navigator(
        initialRoute: 'part/part1',
        onGenerateRoute: (RouteSettings settings) {
          RoutePageBuilder builder;
          switch (settings.name) {
            case 'part/part1':
              builder = (_, __, ___) => PartPage1(
                    pageContext: context,
                  );
              break;
            case 'part/part2':
              builder = (_, __, ___) => PartPage2(
                    pageContext: context,
                  );
              break;
            default:
              throw Exception('Invalid route: ${settings.name}');
          }
          return PageRouteBuilder(
            pageBuilder: builder,
            transitionDuration: const Duration(milliseconds: 0),
          );
        },
      ),
      bottomNavigationBar: Container(
        height: 40.0,
        color: Colors.red,
      ),
    );
  }
}

class PartPage1 extends StatelessWidget {
  final BuildContext pageContext;

  const PartPage1({Key key, this.pageContext}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text.rich(
          TextSpan(
              style: TextStyle(fontSize: 20.0),
              text: 'This is part',
              children: [
                TextSpan(
                  style: TextStyle(fontSize: 40.0, color: Colors.red),
                  text: ' 1',
                )
              ]),
        ),
        RaisedButton(
          onPressed: () {
            Navigator.of(context).pushNamed('part/part2');
          },
          child: Text('To Part 2'),
        ),
        RaisedButton(
          onPressed: () {
            Navigator.of(pageContext)
                .push(MaterialPageRoute(builder: (_) => AnotherPage()));
          },
          child: Text('To Another Page'),
        )
      ],
    );
  }
}

class PartPage2 extends StatelessWidget {
  final BuildContext pageContext;

  const PartPage2({Key key, this.pageContext}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text.rich(
          TextSpan(
              style: TextStyle(fontSize: 20.0),
              text: 'This is part',
              children: [
                TextSpan(
                  style: TextStyle(fontSize: 40.0, color: Colors.red),
                  text: ' 2',
                )
              ]),
        ),
        RaisedButton(
          onPressed: () {
            Navigator.of(context).pushNamed('part/part1');
          },
          child: Text('To Part 1'),
        ),
        RaisedButton(
          onPressed: () {
            Navigator.of(pageContext)
                .push(MaterialPageRoute(builder: (_) => AnotherPage()));
          },
          child: Text('To Another Page'),
        )
      ],
    );
  }
}

class AnotherPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      body: Center(
        child: Text(
          'This is another page',
          style: TextStyle(fontSize: 30.0),
        ),
      ),
    );
  }
}
	import 'package:flutter/material.dart';

	class PartNavigatorPage extends StatefulWidget {
	final Map<String, WidgetBuilder> routes;
	final Widget home;

	const PartNavigatorPage({Key key, this.routes, this.home}) : super(key: key);

	@override
	State<StatefulWidget> createState() => PartNavigatorState();
	}

	class PartNavigatorState extends State<PartNavigatorPage> {
	@override
	Widget build(BuildContext context) {
	return Scaffold(
	appBar: AppBar(
	title: Text('PartNavigator'),
	),
	body: Navigator(
	initialRoute: 'part/part1',
	onGenerateRoute: (RouteSettings settings) {
	RoutePageBuilder builder;
	switch (settings.name) {
	case 'part/part1':
	builder = (_, __, ___) => PartPage1(
	pageContext: context,
	);
	break;
	case 'part/part2':
	builder = (_, __, ___) => PartPage2(
	pageContext: context,
	);
	break;
	default:
	throw Exception('Invalid route: ${settings.name}');
	}
	return PageRouteBuilder(
	pageBuilder: builder,
	transitionDuration: const Duration(milliseconds: 0),
	);
	},
	),
	bottomNavigationBar: Container(
	height: 40.0,
	color: Colors.red,
	),
	);
	}
	}

	class PartPage1 extends StatelessWidget {
	final BuildContext pageContext;

	const PartPage1({Key key, this.pageContext}) : super(key: key);

	@override
	Widget build(BuildContext context) {
	return Column(
	mainAxisAlignment: MainAxisAlignment.center,
	children: <Widget>[
	Text.rich(
	TextSpan(
	style: TextStyle(fontSize: 20.0),
	text: 'This is part',
	children: [
	TextSpan(
	style: TextStyle(fontSize: 40.0, color: Colors.red),
	text: ' 1',
	)
	]),
	),
	RaisedButton(
	onPressed: () {
	Navigator.of(context).pushNamed('part/part2');
	},
	child: Text('To Part 2'),
	),
	RaisedButton(
	onPressed: () {
	Navigator.of(pageContext)
	.push(MaterialPageRoute(builder: (_) => AnotherPage()));
	},
	child: Text('To Another Page'),
	)
	],
	);
	}
	}

	class PartPage2 extends StatelessWidget {
	final BuildContext pageContext;

	const PartPage2({Key key, this.pageContext}) : super(key: key);

	@override
	Widget build(BuildContext context) {
	return Column(
	mainAxisAlignment: MainAxisAlignment.center,
	children: <Widget>[
	Text.rich(
	TextSpan(
	style: TextStyle(fontSize: 20.0),
	text: 'This is part',
	children: [
	TextSpan(
	style: TextStyle(fontSize: 40.0, color: Colors.red),
	text: ' 2',
	)
	]),
	),
	RaisedButton(
	onPressed: () {
	Navigator.of(context).pushNamed('part/part1');
	},
	child: Text('To Part 1'),
	),
	RaisedButton(
	onPressed: () {
	Navigator.of(pageContext)
	.push(MaterialPageRoute(builder: (_) => AnotherPage()));
	},
	child: Text('To Another Page'),
	)
	],
	);
	}
	}

	class AnotherPage extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	// TODO: implement build
	return Scaffold(
	body: Center(
	child: Text(
	'This is another page',
	style: TextStyle(fontSize: 30.0),
	),
	),
	);
	}
	}