老孟导读：Flutter组件有一个很大的特色，那就是很多复杂的组件都是通过一个一个小组件拼装而成的，今天就来说说系统的ExpansionPanelList是如何实现的。 在了解ExpansionPan
SingleChildScrollView(
child: MergeableMaterial(
children: [
MaterialSlice(
key: ValueKey(1),child: Container(
height: 45,color: Colors.primaries[1 % Colors.primaries.length],)),MaterialGap(key: ValueKey(2)),MaterialSlice(
key: ValueKey(3),MaterialGap(key: ValueKey(4)),MaterialSlice(
key: ValueKey(5),],),)
List<MergeableMaterialItem> items = [];
List.generate(_count,(index) {
items.add(MaterialSlice(
key: ValueKey(index * 2),child: Container(
height: 45,color: Colors.primaries[index % Colors.primaries.length],)));
});
return SingleChildScrollView(
child: MergeableMaterial(
children: items,)
MergeableMaterial(
hasDividers: true,elevation: 24,children: items,)
bool _expand = false;
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Container(
height: 45,color: Colors.green.withOpacity(.3),alignment: Alignment.centerRight,child: IconButton(
icon: Icon(Icons.arrow_drop_down),onPressed: () {
setState(() {
_expand = !_expand;
});
},_expand
? MergeableMaterial(
hasDividers: true,children: [
MaterialSlice(
key: ValueKey(1),child: Container(
height: 200,))
],)
: Container(),Container(
height: 45,color: Colors.red.withOpacity(.3),);
}
服务热线 19970861797
