ExpansionPanelList In Flutter

ExpansionPanelList In Flutter :

ExpansionPanelList In Flutter : ExpansionPanelList is an item that can open a merged list control.

you can see that there are three parameters

children content

animationDuration : This is used for Turns off the duration of the execution animation

expansionCallback : This is used for opens a closed callback

in expansionPanel List when you click the List the sub list is Expand

Screenshot :

ExpansionPanelList In Flutter

ExpansionPanelList.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'ExpansionTile',
      theme: ThemeData.dark(),
      home: ExpansionPanelListDemo(),
    );
  }
}

class ExpansionPanelListDemo extends StatefulWidget {
  @override
  _ExpansionPanelListDemoState createState() => _ExpansionPanelListDemoState();
}

class _ExpansionPanelListDemoState extends State<ExpansionPanelListDemo> {
  List<int> mList;

  List<ExpansionStateBean> expansionStateList;

  _ExpansionPanelListDemoState() {
    mList = new List();
    expansionStateList = new List();
    for (var i = 0; i < 10; i++) {
      mList.add(i);
      expansionStateList.add(ExpansionStateBean(i, false));
    }
  }

  _setCurrentIndex(int index, isExpand) {
    setState(() {
      expansionStateList.forEach((item) {
        if (item.index == index) {
          item.isOpen = !isExpand;
        }
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('ExpansionPanelList'),
        ),
        body: SingleChildScrollView(
            child: ExpansionPanelList(
          expansionCallback: (index, bol) {
            _setCurrentIndex(index, bol);
          },
          children: mList.map((index) {
            return ExpansionPanel(
              headerBuilder: (context, isExpanded) {
                return ListTile(
                  title: Text('This is NO.$index'),
                );
              },
              body: ListTile(
                title: Text('expansionPanel NO.$index'),
              ),
              isExpanded: expansionStateList[index].isOpen,
            );
          }).toList(),
        )));
  }
}

class ExpansionStateBean {
  var index;
  var isOpen;
  ExpansionStateBean(this.index, this.isOpen);
}

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