플러터챌린지 5일차 기본문제 - 신현호

readme.md

플러터챌린지 5일차 기본문제 - 신현호

Created with <3 with dartpad.dev.

main.dart

import 'package:flutter/material.dart';

final spaceData = {
    'NGC 162': 1862, '87 Sylvia': 1866, 'R 136a1': 1985, '28978 Ixion': 2001, 'NGC 6715': 1778,
    '94400 Hongdaeyong': 2001, '6354 Vangelis': 1934, 'C/2020 F3': 2020, 'Cartwheel Galaxy': 1941, 'Sculptor Dwarf Elliptical Galaxy': 1937,
    'Eight-Burst Nebula': 1835, 'Rhea': 1672, 'C/1702 H1': 1702, 'Messier 5': 1702, 'Messier 50': 1711,
    'Cassiopeia A': 1680, 'Great Comet of 1680': 1680, 'Butterfly Cluster': 1654, 'Triangulum Galaxy': 1654, 'Comet of 1729': 1729,
    'Omega Nebula': 1745, 'Eagle Nebula': 1745, 'Small Sagittarius Star Cloud': 1764, 'Dumbbell Nebula': 1764, '54509 YORP': 2000,
    'Dia': 2000, '63145 Choemuseon': 2000,
};

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'HelloListView',
      debugShowCheckedModeBanner: false,
      home: HelloListViewScreen(),
    );
  }
}

class HelloListViewScreen extends StatefulWidget {
  @override
  State<HelloListViewScreen> createState() => _HelloListViewScreenState();
}

class _HelloListViewScreenState extends State<HelloListViewScreen> {
  final ScrollController _controller = ScrollController();
  double currentScrollPosition = 0;

  @override
  void initState() {
    super.initState();
    _controller.addListener(() {
      setState(() {
        currentScrollPosition = _controller.offset;
      });
    });
  }
  
   @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('My First List View!')),
      body: Padding(
        padding: const EdgeInsets.symmetric(vertical: 6),
        child: ListView.builder(
          controller: _controller,
          itemBuilder: (context, index) {
            return _ListItem(
              name: spaceData.keys.elementAt(index),
              year: spaceData.values.elementAt(index),
            );
          },
          itemCount: spaceData.length,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _controller.animateTo(
            0,
            duration: const Duration(milliseconds: 160), 
            curve: Curves.linear,
          );
        },
        child: const Icon(Icons.navigation),
      ),
    );
  }
}

class _ListItem extends StatelessWidget {
  final String name;
  final int year;

  const _ListItem({
    required this.name, 
    required this.year
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 12.0, vertical: 6.0),
      child: Container(
        decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(4),
            border: Border.all(color: Colors.grey)),
        child: Padding(
          padding: const EdgeInsets.all(12.0),
          child: Text('🛰️  $name was discovered in $year'),
        ),
      ),
    );
  }
}