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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import '../../gallery/demo.dart';
enum _MaterialListType {
/// A list tile that contains a single line of text.
oneLine,
/// A list tile that contains a [CircleAvatar] followed by a single line of text.
oneLineWithAvatar,
/// A list tile that contains two lines of text.
twoLine,
/// A list tile that contains three lines of text.
threeLine,
}
class ListDemo extends StatefulWidget {
const ListDemo({ super.key });
static const String routeName = '/material/list';
@override
State<ListDemo> createState() => _ListDemoState();
}
class _ListDemoState extends State<ListDemo> {
static final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
PersistentBottomSheetController<void>? _bottomSheet;
_MaterialListType? _itemType = _MaterialListType.threeLine;
bool? _dense = false;
bool? _showAvatars = true;
bool? _showIcons = false;
bool? _showDividers = false;
bool _reverseSort = false;
List<String> items = <String>[
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
];
void changeItemType(_MaterialListType? type) {
setState(() {
_itemType = type;
});
_bottomSheet?.setState!(() { });
}
void _showConfigurationSheet() {
final PersistentBottomSheetController<void> bottomSheet = scaffoldKey.currentState!.showBottomSheet<void>((BuildContext bottomSheetContext) {
return Container(
decoration: const BoxDecoration(
border: Border(top: BorderSide(color: Colors.black26)),
),
child: ListView(
shrinkWrap: true,
primary: false,
children: <Widget>[
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('One-line'),
trailing: Radio<_MaterialListType>(
value: _showAvatars! ? _MaterialListType.oneLineWithAvatar : _MaterialListType.oneLine,
groupValue: _itemType,
onChanged: changeItemType,
),
),
),
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('Two-line'),
trailing: Radio<_MaterialListType>(
value: _MaterialListType.twoLine,
groupValue: _itemType,
onChanged: changeItemType,
),
),
),
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('Three-line'),
trailing: Radio<_MaterialListType>(
value: _MaterialListType.threeLine,
groupValue: _itemType,
onChanged: changeItemType,
),
),
),
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('Show avatar'),
trailing: Checkbox(
value: _showAvatars,
onChanged: (bool? value) {
setState(() {
_showAvatars = value;
});
final StateSetter? bottomSheetSetState = _bottomSheet?.setState;
if (bottomSheetSetState != null) {
bottomSheetSetState(() { });
}
},
),
),
),
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('Show icon'),
trailing: Checkbox(
value: _showIcons,
onChanged: (bool? value) {
setState(() {
_showIcons = value;
});
final StateSetter? bottomSheetSetState = _bottomSheet?.setState;
if (bottomSheetSetState != null) {
bottomSheetSetState(() { });
}
},
),
),
),
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('Show dividers'),
trailing: Checkbox(
value: _showDividers,
onChanged: (bool? value) {
setState(() {
_showDividers = value;
});
final StateSetter? bottomSheetSetState = _bottomSheet?.setState;
if (bottomSheetSetState != null) {
bottomSheetSetState(() { });
}
},
),
),
),
MergeSemantics(
child: ListTile(
dense: true,
title: const Text('Dense layout'),
trailing: Checkbox(
value: _dense,
onChanged: (bool? value) {
setState(() {
_dense = value;
});
final StateSetter? bottomSheetSetState = _bottomSheet?.setState;
if (bottomSheetSetState != null) {
bottomSheetSetState(() { });
}
},
),
),
),
],
),
);
});
setState(() {
_bottomSheet = bottomSheet;
});
_bottomSheet?.closed.whenComplete(() {
if (mounted) {
setState(() {
_bottomSheet = null;
});
}
});
}
Widget buildListTile(BuildContext context, String item) {
Widget? secondary;
if (_itemType == _MaterialListType.twoLine) {
secondary = const Text('Additional item information.');
} else if (_itemType == _MaterialListType.threeLine) {
secondary = const Text(
'Even more additional list item information appears on line three.',
);
}
return MergeSemantics(
child: ListTile(
isThreeLine: _itemType == _MaterialListType.threeLine,
dense: _dense,
leading: _showAvatars != null ? ExcludeSemantics(child: CircleAvatar(child: Text(item))) : null,
title: Text('This item represents $item.'),
subtitle: secondary,
trailing: _showIcons != null ? Icon(Icons.info, color: Theme.of(context).disabledColor) : null,
),
);
}
@override
Widget build(BuildContext context) {
final String layoutText = _dense != null ? ' \u2013 Dense' : '';
String? itemTypeText;
switch (_itemType) {
case _MaterialListType.oneLine:
case _MaterialListType.oneLineWithAvatar:
itemTypeText = 'Single-line';
break;
case _MaterialListType.twoLine:
itemTypeText = 'Two-line';
break;
case _MaterialListType.threeLine:
itemTypeText = 'Three-line';
break;
case null:
break;
}
Iterable<Widget> listTiles = items.map<Widget>((String item) => buildListTile(context, item));
if (_showDividers != null) {
listTiles = ListTile.divideTiles(context: context, tiles: listTiles);
}
return Scaffold(
key: scaffoldKey,
appBar: AppBar(
title: Text('Scrolling list\n$itemTypeText$layoutText'),
actions: <Widget>[
MaterialDemoDocumentationButton(ListDemo.routeName),
IconButton(
icon: const Icon(Icons.sort_by_alpha),
tooltip: 'Sort',
onPressed: () {
setState(() {
_reverseSort = !_reverseSort;
items.sort((String a, String b) => _reverseSort ? b.compareTo(a) : a.compareTo(b));
});
},
),
IconButton(
icon: Icon(
Theme.of(context).platform == TargetPlatform.iOS
? Icons.more_horiz
: Icons.more_vert,
),
tooltip: 'Show menu',
onPressed: _bottomSheet == null ? _showConfigurationSheet : null,
),
],
),
body: Scrollbar(
child: ListView(
primary: true,
padding: EdgeInsets.symmetric(vertical: _dense != null ? 4.0 : 8.0),
children: listTiles.toList(),
),
),
);
}
}