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Add flutter_web samples (#75)
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Kevin Moore
committed by
Andrew Brogdon
Andrew Brogdon
parent
42f2dce01b
commit
3fe927cb29
228
web/gallery/lib/demo/material/leave_behind_demo.dart
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228
web/gallery/lib/demo/material/leave_behind_demo.dart
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:collection/collection.dart' show lowerBound;
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import 'package:flutter_web/material.dart';
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import 'package:flutter_web/semantics.dart';
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import '../../gallery/demo.dart';
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enum LeaveBehindDemoAction { reset, horizontalSwipe, leftSwipe, rightSwipe }
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class LeaveBehindItem implements Comparable<LeaveBehindItem> {
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LeaveBehindItem({this.index, this.name, this.subject, this.body});
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LeaveBehindItem.from(LeaveBehindItem item)
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: index = item.index,
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name = item.name,
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subject = item.subject,
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body = item.body;
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final int index;
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final String name;
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final String subject;
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final String body;
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@override
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int compareTo(LeaveBehindItem other) => index.compareTo(other.index);
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}
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class LeaveBehindDemo extends StatefulWidget {
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const LeaveBehindDemo({Key key}) : super(key: key);
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static const String routeName = '/material/leave-behind';
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@override
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LeaveBehindDemoState createState() => LeaveBehindDemoState();
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}
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class LeaveBehindDemoState extends State<LeaveBehindDemo> {
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static final GlobalKey<ScaffoldState> _scaffoldKey =
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GlobalKey<ScaffoldState>();
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DismissDirection _dismissDirection = DismissDirection.horizontal;
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List<LeaveBehindItem> leaveBehindItems;
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void initListItems() {
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leaveBehindItems = List<LeaveBehindItem>.generate(16, (int index) {
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return LeaveBehindItem(
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index: index,
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name: 'Item $index Sender',
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subject: 'Subject: $index',
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body: "[$index] first line of the message's body...");
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});
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}
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@override
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void initState() {
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super.initState();
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initListItems();
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}
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void handleDemoAction(LeaveBehindDemoAction action) {
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setState(() {
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switch (action) {
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case LeaveBehindDemoAction.reset:
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initListItems();
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break;
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case LeaveBehindDemoAction.horizontalSwipe:
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_dismissDirection = DismissDirection.horizontal;
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break;
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case LeaveBehindDemoAction.leftSwipe:
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_dismissDirection = DismissDirection.endToStart;
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break;
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case LeaveBehindDemoAction.rightSwipe:
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_dismissDirection = DismissDirection.startToEnd;
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break;
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}
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});
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}
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void handleUndo(LeaveBehindItem item) {
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final int insertionIndex = lowerBound(leaveBehindItems, item);
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setState(() {
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leaveBehindItems.insert(insertionIndex, item);
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});
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}
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void _handleArchive(LeaveBehindItem item) {
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setState(() {
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leaveBehindItems.remove(item);
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});
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_scaffoldKey.currentState.showSnackBar(SnackBar(
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content: Text('You archived item ${item.index}'),
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action: SnackBarAction(
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label: 'UNDO',
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onPressed: () {
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handleUndo(item);
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})));
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}
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void _handleDelete(LeaveBehindItem item) {
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setState(() {
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leaveBehindItems.remove(item);
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});
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_scaffoldKey.currentState.showSnackBar(SnackBar(
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content: Text('You deleted item ${item.index}'),
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action: SnackBarAction(
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label: 'UNDO',
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onPressed: () {
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handleUndo(item);
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})));
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}
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@override
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Widget build(BuildContext context) {
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Widget body;
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if (leaveBehindItems.isEmpty) {
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body = Center(
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child: RaisedButton(
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onPressed: () => handleDemoAction(LeaveBehindDemoAction.reset),
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child: const Text('Reset the list'),
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),
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);
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} else {
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body = ListView(
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children: leaveBehindItems.map<Widget>((LeaveBehindItem item) {
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return _LeaveBehindListItem(
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item: item,
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onArchive: _handleArchive,
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onDelete: _handleDelete,
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dismissDirection: _dismissDirection,
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);
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}).toList());
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}
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return Scaffold(
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key: _scaffoldKey,
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appBar: AppBar(title: const Text('Swipe to dismiss'), actions: <Widget>[
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MaterialDemoDocumentationButton(LeaveBehindDemo.routeName),
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PopupMenuButton<LeaveBehindDemoAction>(
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onSelected: handleDemoAction,
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itemBuilder: (BuildContext context) =>
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<PopupMenuEntry<LeaveBehindDemoAction>>[
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const PopupMenuItem<LeaveBehindDemoAction>(
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value: LeaveBehindDemoAction.reset,
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child: Text('Reset the list')),
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const PopupMenuDivider(),
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CheckedPopupMenuItem<LeaveBehindDemoAction>(
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value: LeaveBehindDemoAction.horizontalSwipe,
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checked: _dismissDirection == DismissDirection.horizontal,
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child: const Text('Horizontal swipe')),
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CheckedPopupMenuItem<LeaveBehindDemoAction>(
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value: LeaveBehindDemoAction.leftSwipe,
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checked: _dismissDirection == DismissDirection.endToStart,
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child: const Text('Only swipe left')),
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CheckedPopupMenuItem<LeaveBehindDemoAction>(
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value: LeaveBehindDemoAction.rightSwipe,
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checked: _dismissDirection == DismissDirection.startToEnd,
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child: const Text('Only swipe right'))
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])
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]),
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body: body,
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);
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}
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}
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class _LeaveBehindListItem extends StatelessWidget {
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const _LeaveBehindListItem({
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Key key,
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@required this.item,
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@required this.onArchive,
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@required this.onDelete,
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@required this.dismissDirection,
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}) : super(key: key);
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final LeaveBehindItem item;
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final DismissDirection dismissDirection;
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final void Function(LeaveBehindItem) onArchive;
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final void Function(LeaveBehindItem) onDelete;
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void _handleArchive() {
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onArchive(item);
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}
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void _handleDelete() {
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onDelete(item);
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}
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@override
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Widget build(BuildContext context) {
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final ThemeData theme = Theme.of(context);
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return Semantics(
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customSemanticsActions: <CustomSemanticsAction, VoidCallback>{
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const CustomSemanticsAction(label: 'Archive'): _handleArchive,
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const CustomSemanticsAction(label: 'Delete'): _handleDelete,
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},
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child: Dismissible(
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key: ObjectKey(item),
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direction: dismissDirection,
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onDismissed: (DismissDirection direction) {
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if (direction == DismissDirection.endToStart)
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_handleArchive();
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else
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_handleDelete();
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},
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background: Container(
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color: theme.primaryColor,
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child: const ListTile(
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leading: Icon(Icons.delete, color: Colors.white, size: 36.0))),
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secondaryBackground: Container(
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color: theme.primaryColor,
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child: const ListTile(
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trailing:
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Icon(Icons.archive, color: Colors.white, size: 36.0))),
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child: Container(
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decoration: BoxDecoration(
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color: theme.canvasColor,
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border: Border(bottom: BorderSide(color: theme.dividerColor))),
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child: ListTile(
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title: Text(item.name),
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subtitle: Text('${item.subject}\n${item.body}'),
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isThreeLine: true),
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),
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),
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);
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}
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}
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