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Flutter UI #25: Fun with Expansion Card in Flutter

Tutorial and code of Expansion Card in Flutter. Copy and paste the below code as per your requirements.

import 'package:flutter/material.dart';
import 'package:expansion_tile_card/expansion_tile_card.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'ExpansionTileCard Demo',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: const MyHomePage(title: 'ExpansionTileCard Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, this.title}) : super(key: key);

  final String? title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<ExpansionTileCardState> cardA = GlobalKey();
  final GlobalKey<ExpansionTileCardState> cardB = GlobalKey();

  @override
  Widget build(BuildContext context) {
    final ButtonStyle flatButtonStyle = TextButton.styleFrom(
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
    );

    return Scaffold(
      appBar: AppBar(
        title: Center(child: Text(widget.title!),),
      ),
      body: ListView(
        children: <Widget>[
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 12.0),
            child: ExpansionTileCard(
              key: cardA,
              leading: const CircleAvatar(child: Text('A')),
              title: const Text('Tap me!'),
              subtitle: const Text('I expand!'),
              children: <Widget>[
                const Divider(
                  thickness: 1.0,
                  height: 1.0,
                ),
                Align(
                  alignment: Alignment.centerLeft,
                  child: Padding(
                    padding: const EdgeInsets.symmetric(
                      horizontal: 16.0,
                      vertical: 8.0,
                    ),
                    child: Text(
                      """This is the content""",
                      style: Theme.of(context)
                          .textTheme
                          .bodyText2!
                          .copyWith(fontSize: 16),
                    ),
                  ),
                ),
                ButtonBar(
                  alignment: MainAxisAlignment.spaceAround,
                  buttonHeight: 52.0,
                  buttonMinWidth: 90.0,
                  children: <Widget>[
                    TextButton(
                      style: flatButtonStyle,
                      onPressed: () {
                        cardB.currentState?.expand();
                      },
                      child: Column(
                        children: const<Widget>[
                          Icon(Icons.arrow_downward),
                          Padding(
                            padding: EdgeInsets.symmetric(vertical: 2.0),
                          ),
                          Text('Open'),
                        ],
                      ),
                    ),
                    TextButton(
                      style: flatButtonStyle,
                      onPressed: () {
                        cardB.currentState?.collapse();
                      },
                      child: Column(
                        children: const<Widget>[
                          Icon(Icons.arrow_upward),
                          Padding(
                            padding: EdgeInsets.symmetric(vertical: 2.0),
                          ),
                          Text('Close'),
                        ],
                      ),
                    ),
                    TextButton(
                      style: flatButtonStyle,
                      onPressed: () {
                        cardB.currentState?.toggleExpansion();
                      },
                      child: Column(
                        children: const<Widget>[
                          Icon(Icons.swap_vert),
                          Padding(
                            padding: EdgeInsets.symmetric(vertical: 2.0),
                          ),
                          Text('Toggle'),
                        ],
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 12.0),
            child: ExpansionTileCard(
              key: cardB,
              expandedTextColor: Colors.red,
              leading: const CircleAvatar(child: Text('B')),
              title: const Text('Tap me!'),
              subtitle: const Text('I expand, too!'),
              children: <Widget>[
                const Divider(
                  thickness: 1.0,
                  height: 1.0,
                ),
                Align(
                  alignment: Alignment.centerLeft,
                  child: Padding(
                    padding: const EdgeInsets.symmetric(
                      horizontal: 16.0,
                      vertical: 8.0,
                    ),
                    child: Text(
                      """This is content""",
                      style: Theme.of(context)
                          .textTheme
                          .bodyText2!
                          .copyWith(fontSize: 16),
                    ),
                  ),
                ),
                ButtonBar(
                  alignment: MainAxisAlignment.spaceAround,
                  buttonHeight: 52.0,
                  buttonMinWidth: 90.0,
                  children: <Widget>[
                    TextButton(
                      style: flatButtonStyle,
                      onPressed: () {
                        cardA.currentState?.expand();
                      },
                      child: Column(
                        children: const<Widget>[
                          Icon(Icons.arrow_downward),
                          Padding(
                            padding: EdgeInsets.symmetric(vertical: 2.0),
                          ),
                          Text('Open'),
                        ],
                      ),
                    ),
                    TextButton(
                      style: flatButtonStyle,
                      onPressed: () {
                        cardA.currentState?.collapse();
                      },
                      child: Column(
                        children: const<Widget>[
                          Icon(Icons.arrow_upward),
                          Padding(
                            padding: EdgeInsets.symmetric(vertical: 2.0),
                          ),
                          Text('Close'),
                        ],
                      ),
                    ),
                    TextButton(
                      style: flatButtonStyle,
                      onPressed: () {
                        cardA.currentState?.toggleExpansion();
                      },
                      child: Column(
                        children: const<Widget>[
                          Icon(Icons.swap_vert),
                          Padding(
                            padding: EdgeInsets.symmetric(vertical: 2.0),
                          ),
                          Text('Toggle'),
                        ],
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

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