| // Copyright 2015 The Chromium 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'; |
| |
| class CardModel { |
| CardModel(this.value, this.size, this.color); |
| int value; |
| Size size; |
| Color color; |
| String get label => 'Card $value'; |
| Key get key => ObjectKey(this); |
| } |
| |
| class PageViewApp extends StatefulWidget { |
| @override |
| PageViewAppState createState() => PageViewAppState(); |
| } |
| |
| class PageViewAppState extends State<PageViewApp> { |
| @override |
| void initState() { |
| super.initState(); |
| const List<Size> cardSizes = <Size>[ |
| Size(100.0, 300.0), |
| Size(300.0, 100.0), |
| Size(200.0, 400.0), |
| Size(400.0, 400.0), |
| Size(300.0, 400.0), |
| ]; |
| |
| cardModels = List<CardModel>.generate(cardSizes.length, (int i) { |
| final Color color = Color.lerp(Colors.red.shade300, Colors.blue.shade900, i / cardSizes.length); |
| return CardModel(i, cardSizes[i], color); |
| }); |
| } |
| |
| static const TextStyle cardLabelStyle = |
| TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: FontWeight.bold); |
| |
| List<CardModel> cardModels; |
| Size pageSize = const Size(200.0, 200.0); |
| Axis scrollDirection = Axis.horizontal; |
| bool itemsWrap = false; |
| |
| Widget buildCard(CardModel cardModel) { |
| final Widget card = Card( |
| color: cardModel.color, |
| child: Container( |
| width: cardModel.size.width, |
| height: cardModel.size.height, |
| padding: const EdgeInsets.all(8.0), |
| child: Center(child: Text(cardModel.label, style: cardLabelStyle)), |
| ), |
| ); |
| |
| final BoxConstraints constraints = (scrollDirection == Axis.vertical) |
| ? BoxConstraints.tightFor(height: pageSize.height) |
| : BoxConstraints.tightFor(width: pageSize.width); |
| |
| return Container( |
| key: cardModel.key, |
| constraints: constraints, |
| child: Center(child: card), |
| ); |
| } |
| |
| void switchScrollDirection() { |
| setState(() { |
| scrollDirection = (scrollDirection == Axis.vertical) |
| ? Axis.horizontal |
| : Axis.vertical; |
| }); |
| } |
| |
| void toggleItemsWrap() { |
| setState(() { |
| itemsWrap = !itemsWrap; |
| }); |
| } |
| |
| Widget _buildDrawer() { |
| return Drawer( |
| child: ListView( |
| children: <Widget>[ |
| const DrawerHeader(child: Center(child: Text('Options'))), |
| ListTile( |
| leading: const Icon(Icons.more_horiz), |
| selected: scrollDirection == Axis.horizontal, |
| trailing: const Text('Horizontal Layout'), |
| onTap: switchScrollDirection, |
| ), |
| ListTile( |
| leading: const Icon(Icons.more_vert), |
| selected: scrollDirection == Axis.vertical, |
| trailing: const Text('Vertical Layout'), |
| onTap: switchScrollDirection, |
| ), |
| ListTile( |
| onTap: toggleItemsWrap, |
| title: const Text('Scrolling wraps around'), |
| // TODO(abarth): Actually make this checkbox change this value. |
| trailing: Checkbox(value: itemsWrap, onChanged: null), |
| ), |
| ], |
| ), |
| ); |
| } |
| |
| Widget _buildAppBar() { |
| return AppBar( |
| title: const Text('PageView'), |
| actions: <Widget>[ |
| Text(scrollDirection == Axis.horizontal ? 'horizontal' : 'vertical'), |
| ], |
| ); |
| } |
| |
| Widget _buildBody(BuildContext context) { |
| return PageView( |
| children: cardModels.map<Widget>(buildCard).toList(), |
| // TODO(abarth): itemsWrap: itemsWrap, |
| scrollDirection: scrollDirection, |
| ); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return IconTheme( |
| data: const IconThemeData(color: Colors.white), |
| child: Scaffold( |
| appBar: _buildAppBar(), |
| drawer: _buildDrawer(), |
| body: _buildBody(context), |
| ), |
| ); |
| } |
| } |
| |
| void main() { |
| runApp(MaterialApp( |
| title: 'PageView', |
| theme: ThemeData( |
| brightness: Brightness.light, |
| primarySwatch: Colors.blue, |
| accentColor: Colors.redAccent, |
| ), |
| home: PageViewApp(), |
| )); |
| } |