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class Demo extends StatefulWidget {
@override
_DemoState createState() => _DemoState();
}
class _DemoState extends State<Demo> {
List<int> list = [];
@override
void initState() {
super.initState();
for (int i = 0; i < 100; i++) {
list.add(i);
}
}
@override
Widget build(BuildContext context) {
return ReorderableListView(
children: list.map(f).toList(),
header: Text('This is the header!'),
onReorder: (oldIndex, newIndex) {
setState(() {
_updateMyItems(oldIndex, newIndex);
});
});
}
void _updateMyItems(int oldIndex, int newIndex) {
var tmp = list[oldIndex];
list[oldIndex] = list[newIndex];
list[newIndex] = tmp;
}
Widget f(int i) {
return ListTile(
key: ValueKey("$i"),
title: Text('Item $i'),
);
}
}
