main.dart

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Web3 News',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorSchemeSeed: Colors.blue,
      ),
      home: const NewsPage(),
    );
  }
}

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

  @override
  State<NewsPage> createState() => _NewsPageState();
}

class _NewsPageState extends State<NewsPage> {
  int _currentIndex = 0;
  final List<Community> _communities = [
    Community(name: 'Bitcoin', content: [
      NewsItem(title: 'Bitcoin Price Surges to $50,000', description: 'Bitcoin price surged to $50,000 today, reaching a new all-time high.'),
      NewsItem(title: 'Bitcoin Mining Difficulty Reaches New High', description: 'The bitcoin mining difficulty has reached a new high, making it harder for miners to solve complex mathematical equations.'),
    ]),
    Community(name: 'Ethereum', content: [
      NewsItem(title: 'Ethereum 2.0 Launches Successfully', description: 'Ethereum 2.0 has launched successfully, marking a major milestone in the Ethereum network\'s development.'),
      NewsItem(title: 'Ethereum Gas Fees Reach New High', description: 'Ethereum gas fees have reached a new high, making it more expensive for users to transact on the network.'),
    ]),
    Community(name: 'Solana', content: [
      NewsItem(title: 'Solana Price Rises to $100', description: 'Solana price has risen to $100, reaching a new all-time high.'),
      NewsItem(title: 'Solana Launches New NFT Marketplace', description: 'Solana has launched a new NFT marketplace, allowing users to buy and sell digital art and collectibles.'),
    ]),
  ];

  void _onTabChanged(int index) {
    setState(() {
      _currentIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Web3 News'),
        bottom: TabBar(
          tabs: _communities.map((community) => Tab(text: community.name)).toList(),
          onTap: _onTabChanged,
        ),
      ),
      body: TabBarView(
        children: _communities.map((community) {
          return ListView.builder(
            itemCount: community.content.length,
            itemBuilder: (context, index) {
              return NewsItemCard(newsItem: community.content[index]);
            },
          );
        }).toList(),
      ),
    );
  }
}

class Community {
  final String name;
  final List<NewsItem> content;

  Community({required this.name, required this.content});
}

class NewsItem {
  final String title;
  final String description;

  NewsItem({required this.title, required this.description});
}

class NewsItemCard extends StatelessWidget {
  final NewsItem newsItem;

  NewsItemCard({required this.newsItem});

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              newsItem.title,
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            Text(
              newsItem.description,
              style: Theme.of(context).textTheme.bodyText2,
            ),
          ],
        ),
      ),
    );
  }
}