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June 26, 2018 12:27
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tabs_demo.dart
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// 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'; | |
// Each TabBarView contains a _Page and for each _Page there is a list | |
// of _CardData objects. Each _CardData object is displayed by a _CardItem. | |
const String _kGalleryAssetsPackage = 'flutter_gallery_assets'; | |
class _Page { | |
_Page({ this.label }); | |
final String label; | |
String get id => label[0]; | |
@override | |
String toString() => '$runtimeType("$label")'; | |
} | |
class _CardData { | |
const _CardData({ this.title, this.imageAsset, this.imageAssetPackage }); | |
final String title; | |
final String imageAsset; | |
final String imageAssetPackage; | |
} | |
final Map<_Page, List<_CardData>> _allPages = <_Page, List<_CardData>>{ | |
new _Page(label: 'HOME'): <_CardData>[ | |
const _CardData( | |
title: 'Flatwear', | |
imageAsset: 'products/flatwear.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Pine Table', | |
imageAsset: 'products/table.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blue Cup', | |
imageAsset: 'products/cup.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Tea Set', | |
imageAsset: 'products/teaset.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Desk Set', | |
imageAsset: 'products/deskset.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blue Linen Napkins', | |
imageAsset: 'products/napkins.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Planters', | |
imageAsset: 'products/planters.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Kitchen Quattro', | |
imageAsset: 'products/kitchen_quattro.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Platter', | |
imageAsset: 'products/platter.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
], | |
new _Page(label: 'APPAREL'): <_CardData>[ | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
], | |
new _Page(label: 'APPAREL11'): <_CardData>[ | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Cloud-White Dress', | |
imageAsset: 'products/dress.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Ginger Scarf', | |
imageAsset: 'products/scarf.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
const _CardData( | |
title: 'Blush Sweats', | |
imageAsset: 'products/sweats.png', | |
imageAssetPackage: _kGalleryAssetsPackage, | |
), | |
], | |
}; | |
class _CardDataItem extends StatelessWidget { | |
const _CardDataItem({ this.page, this.data }); | |
static const double height = 272.0; | |
final _Page page; | |
final _CardData data; | |
@override | |
Widget build(BuildContext context) { | |
return new Card( | |
child: new Padding( | |
padding: const EdgeInsets.all(16.0), | |
child: new Column( | |
crossAxisAlignment: CrossAxisAlignment.stretch, | |
mainAxisAlignment: MainAxisAlignment.start, | |
children: <Widget>[ | |
new Align( | |
alignment: page.id == 'H' | |
? Alignment.centerLeft | |
: Alignment.centerRight, | |
child: new CircleAvatar(child: new Text('${page.id}')), | |
), | |
new SizedBox( | |
width: 144.0, | |
height: 144.0, | |
child: new Image.asset( | |
data.imageAsset, | |
package: data.imageAssetPackage, | |
fit: BoxFit.contain, | |
), | |
), | |
new Center( | |
child: new Text( | |
data.title, | |
style: Theme.of(context).textTheme.title, | |
), | |
), | |
], | |
), | |
), | |
); | |
} | |
} | |
class TabsDemo extends StatelessWidget { | |
static const String routeName = '/material/tabs'; | |
@override | |
Widget build(BuildContext context) { | |
return new DefaultTabController( | |
length: _allPages.length, | |
child: new Scaffold( | |
body: new NestedScrollView( | |
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) { | |
return <Widget>[ | |
new SliverOverlapAbsorber( | |
handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context), | |
child: new SliverAppBar( | |
title: const Text('Tabs and scrolling'), | |
pinned: true, | |
expandedHeight: 150.0, | |
forceElevated: innerBoxIsScrolled, | |
bottom: new TabBar( | |
tabs: _allPages.keys.map( | |
(_Page page) => new Tab(text: page.label), | |
).toList(), | |
), | |
), | |
), | |
]; | |
}, | |
body: new TabBarView( | |
children: _allPages.keys.map((_Page page) { | |
return new SafeArea( | |
top: false, | |
bottom: false, | |
child: new Builder( | |
builder: (BuildContext context) { | |
return new CustomScrollView( | |
key: new PageStorageKey<_Page>(page), | |
slivers: <Widget>[ | |
new SliverOverlapInjector( | |
handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context), | |
), | |
new SliverPadding( | |
padding: const EdgeInsets.symmetric( | |
vertical: 8.0, | |
horizontal: 16.0, | |
), | |
sliver: new SliverFixedExtentList( | |
itemExtent: _CardDataItem.height, | |
delegate: new SliverChildBuilderDelegate( | |
(BuildContext context, int index) { | |
final _CardData data = _allPages[page][index]; | |
return new Padding( | |
padding: const EdgeInsets.symmetric( | |
vertical: 8.0, | |
), | |
child: new _CardDataItem( | |
page: page, | |
data: data, | |
), | |
); | |
}, | |
childCount: _allPages[page].length, | |
), | |
), | |
), | |
], | |
); | |
}, | |
), | |
); | |
}).toList(), | |
), | |
), | |
), | |
); | |
} | |
} |
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