navigator-in-same-screen.dart

navigator-in-same-screen.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Navigation',
      home:  MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final controller = PageController();
  final list = ["Home","Services", "Work", "About"];
  final colors = [Colors.orange, Colors.blue, Colors.red, Colors.green];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            Row(
              children: <Widget>[
                Container(
                  width: 50,
                  height: 50,
                  margin: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.blue,
                    borderRadius: BorderRadius.circular(10),
                  ),
                ),
                const Spacer(),
                Row(
                  children: List.generate(3, (index){
                    return GestureDetector(
                      onTap: (){
                        _scrollToIndex(index);
                      },
                      child: Container(
                        margin: const EdgeInsets.all(8),
                        child: Text(
                          list[index+1],
                        ),
                      ),
                    );
                  }),
                )
              ],
            ),
            Expanded(
              child : PageView(
                scrollDirection: Axis.vertical,
                pageSnapping: false,
                controller: controller,
                children: List.generate(list.length, (index){
                  return Container(
                    width: MediaQuery.of(context).size.width,
                    height: double.maxFinite,
                    color: colors[index],
                    child: Center(
                      child: Text(
                        list[index],
                        style: const TextStyle(color: Colors.white),
                      ),
                    ),
                  );
                })
              ),
            ),
          ],
        )
      ),
    );
  }

  void _scrollToIndex(int index) {
    controller.animateToPage(
      index + 1, 
      duration: const Duration(seconds: 2),
      curve: Curves.fastLinearToSlowEaseIn,
    );
  }
}