how to change layout in Flutter - flutter

Question

I've been trying to design the layout of my ExpansionTile just like the design below but I couldn't figure out how to change the layout. any suggestion on how to change the border radius, change the background color and also make a gap between each other?.
I tried adding boxDecoration in each container but the style only apply to outside but not on each expansionTile.
import 'package:flutter/material.dart';
class MyReoderWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
return ReorderItems(topTen: ['j']);
}
}
class DataHolder {
List<String> parentKeys;
Map<String, List<String>> childMap;
DataHolder._privateConstructor();
static final DataHolder _dataHolder = DataHolder._privateConstructor();
static DataHolder get instance => _dataHolder;
factory DataHolder.initialize({#required parentKeys}) {
_dataHolder.parentKeys = parentKeys;
_dataHolder.childMap = {};
for (String key in parentKeys) {
_dataHolder.childMap.putIfAbsent(
}
return _dataHolder;
}
}
class ReorderItems extends StatefulWidget {
final List<String> topTen;
ReorderItems({this.topTen});
#override
_ReorderItemsState createState() => _ReorderItemsState();
}
class _ReorderItemsState extends State<ReorderItems> {
#override
void initState() {
super.initState();
// initialize the children for the Expansion tile
// This initialization can be replaced with any logic like network fetch or something else.
DataHolder.initialize(parentKeys: widget.topTen);
}
#override
Widget build(BuildContext context) {
return PrimaryScrollController(
key: ValueKey(widget.topTen.toString()),
controller: ScrollController(),
child: Container(
decoration: BoxDecoration(),
child: ReorderableListView(
onReorder: onReorder,
children: getListItem(),
),
),
);
}
List<ExpansionTile> getListItem() => DataHolder.instance.parentKeys
.asMap()
.map((index, item) => MapEntry(index, buildTenableListTile(item, index)))
.values
.toList();
ExpansionTile buildTenableListTile(String mapKey, int index) => ExpansionTile(
key: ValueKey(mapKey),
title: Text(mapKey),
leading: Icon(Icons.list),
children: [
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(20))
),
key: ValueKey('$mapKey$index'),
height: 200,
child: Container(
padding: EdgeInsets.only(left: 30.0),
child: ReorderList(
parentMapKey: mapKey,
),
),
),
],
);
void onReorder(int oldIndex, int newIndex) {
if (newIndex > oldIndex) {
newIndex -= 1;
}
setState(() {
String game = widget.topTen[oldIndex];
DataHolder.instance.parentKeys.removeAt(oldIndex);
DataHolder.instance.parentKeys.insert(newIndex, game);
});
}
}
class ReorderList extends StatefulWidget {
final String parentMapKey;
ReorderList({this.parentMapKey});
#override
_ReorderListState createState() => _ReorderListState();
}
class _ReorderListState extends State<ReorderList> {
#override
Widget build(BuildContext context) {
return PrimaryScrollController(
controller: ScrollController(),
child: ReorderableListView(
// scrollController: ScrollController(),
onReorder: onReorder,
children: DataHolder.instance.childMap[widget.parentMapKey]
.map(
(String child) => Container(
child: ListTile(
key: ValueKey(child),
leading: Icon(Icons.list),
title: Text(child),
),
),
)
.toList(),
),
);
}
void onReorder(int oldIndex, int newIndex) {
if (newIndex > oldIndex) {
newIndex -= 1;
}
List<String> children = DataHolder.instance.childMap[widget.parentMapKey];
String game = children[oldIndex];
children.removeAt(oldIndex);
children.insert(newIndex, game);
DataHolder.instance.childMap[widget.parentMapKey] = children;
// Need to set state to rebuild the children.
setState(() {});
}
}

Answer 1

You can do it using custom expandable container.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Calendar',
theme: ThemeData(
primarySwatch: Colors.grey,
),
debugShowCheckedModeBanner: false,
home: Material(
child: MyReoderWidget(),
),
);
}
}
class CustomModel {
String title;
bool isExpanded;
List<String> subItems;
CustomModel({this.title, this.subItems, this.isExpanded = false});
}
class MyReoderWidget extends StatefulWidget {
#override
_MyReoderWidgetState createState() => _MyReoderWidgetState();
}
class _MyReoderWidgetState extends State<MyReoderWidget> {
List<CustomModel> listItems;
#override
void initState() {
super.initState();
listItems = List<CustomModel>();
listItems.add(CustomModel(
title: "App Name 1", subItems: ["Card Name 1", "Card Name 2"]));
listItems.add(CustomModel(
title: "App Name 2", subItems: ["Card Name 3", "Card Name 4"]));
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
body: ListView(
children: listItems
.map((model) => new Padding(
padding: EdgeInsets.only(
bottom: 10,
),
child: ExpandableCardContainer(
isExpanded: model.isExpanded,
collapsedChild: createHeaderCard(model),
expandedChild: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.only(
bottom: 10,
),
child: createHeaderCard(model),
)
]..addAll(model.subItems
.map((e) => createChildCard(e))
.toList()),
),
),
))
.toList()),
);
}
Widget createHeaderCard(CustomModel model) {
return Container(
child: Row(
children: <Widget>[
Icon(
Icons.more_vert,
color: Colors.white,
),
Expanded(
child: Text(
model.title,
style: TextStyle(color: Colors.white),
),
),
GestureDetector(
onTap: () {
setState(() {
model.isExpanded = !model.isExpanded;
});
},
child: Icon(
model.isExpanded
? Icons.keyboard_arrow_up
: Icons.keyboard_arrow_down,
color: Colors.white,
),
)
],
),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Color(0xFF132435),
),
height: 50,
);
}
Widget createChildCard(String subItems) {
return Container(
margin: EdgeInsets.only(left: 30, bottom: 10),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(
Icons.more_vert,
color: Colors.white,
),
Expanded(
child: Text(
subItems,
style: TextStyle(color: Colors.white),
),
),
],
),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Color(0xFF132435),
),
height: 50,
);
}
}
class ExpandableCardContainer extends StatefulWidget {
final bool isExpanded;
final Widget collapsedChild;
final Widget expandedChild;
const ExpandableCardContainer(
{Key key, this.isExpanded, this.collapsedChild, this.expandedChild})
: super(key: key);
#override
_ExpandableCardContainerState createState() =>
_ExpandableCardContainerState();
}
class _ExpandableCardContainerState extends State<ExpandableCardContainer> {
#override
Widget build(BuildContext context) {
return new AnimatedContainer(
duration: new Duration(milliseconds: 200),
curve: Curves.easeInOut,
child: widget.isExpanded ? widget.expandedChild : widget.collapsedChild,
);
}
}