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Flutter demo card ( copied here for later reference) Using proper stateless widget extraction ( instead of methods that return widgets) + nice demonstration of Enum + asserts + Stack + Text overflow + Ink.image etc... Overall great codee
// 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/foundation.dart';
import 'package:flutter/material.dart';
import '../../gallery/demo.dart';
const String _kGalleryAssetsPackage = 'flutter_gallery_assets';
enum CardDemoType {
standard,
tappable,
selectable,
}
class TravelDestination {
const TravelDestination({
@required this.assetName,
@required this.assetPackage,
@required this.title,
@required this.description,
@required this.city,
@required this.location,
this.type = CardDemoType.standard,
}) : assert(assetName != null),
assert(assetPackage != null),
assert(title != null),
assert(description != null),
assert(city != null),
assert(location != null);
final String assetName;
final String assetPackage;
final String title;
final String description;
final String city;
final String location;
final CardDemoType type;
}
const List<TravelDestination> destinations = <TravelDestination>[
TravelDestination(
assetName: 'places/india_thanjavur_market.png',
assetPackage: _kGalleryAssetsPackage,
title: 'Top 10 Cities to Visit in Tamil Nadu',
description: 'Number 10',
city: 'Thanjavur',
location: 'Thanjavur, Tamil Nadu',
),
TravelDestination(
assetName: 'places/india_chettinad_silk_maker.png',
assetPackage: _kGalleryAssetsPackage,
title: 'Artisans of Southern India',
description: 'Silk Spinners',
city: 'Chettinad',
location: 'Sivaganga, Tamil Nadu',
type: CardDemoType.tappable,
),
TravelDestination(
assetName: 'places/india_tanjore_thanjavur_temple.png',
assetPackage: _kGalleryAssetsPackage,
title: 'Brihadisvara Temple',
description: 'Temples',
city: 'Thanjavur',
location: 'Thanjavur, Tamil Nadu',
type: CardDemoType.selectable,
),
];
class TravelDestinationItem extends StatelessWidget {
const TravelDestinationItem({ Key key, @required this.destination, this.shape })
: assert(destination != null),
super(key: key);
// This height will allow for all the Card's content to fit comfortably within the card.
static const double height = 338.0;
final TravelDestination destination;
final ShapeBorder shape;
@override
Widget build(BuildContext context) {
return SafeArea(
top: false,
bottom: false,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
const SectionTitle(title: 'Normal'),
SizedBox(
height: height,
child: Card(
// This ensures that the Card's children are clipped correctly.
clipBehavior: Clip.antiAlias,
shape: shape,
child: TravelDestinationContent(destination: destination),
),
),
],
),
),
);
}
}
class TappableTravelDestinationItem extends StatelessWidget {
const TappableTravelDestinationItem({ Key key, @required this.destination, this.shape })
: assert(destination != null),
super(key: key);
// This height will allow for all the Card's content to fit comfortably within the card.
static const double height = 298.0;
final TravelDestination destination;
final ShapeBorder shape;
@override
Widget build(BuildContext context) {
return SafeArea(
top: false,
bottom: false,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
const SectionTitle(title: 'Tappable'),
SizedBox(
height: height,
child: Card(
// This ensures that the Card's children (including the ink splash) are clipped correctly.
clipBehavior: Clip.antiAlias,
shape: shape,
child: InkWell(
onTap: () {
print('Card was tapped');
},
// Generally, material cards use onSurface with 12% opacity for the pressed state.
splashColor: Theme.of(context).colorScheme.onSurface.withOpacity(0.12),
// Generally, material cards do not have a highlight overlay.
highlightColor: Colors.transparent,
child: TravelDestinationContent(destination: destination),
),
),
),
],
),
),
);
}
}
class SelectableTravelDestinationItem extends StatefulWidget {
const SelectableTravelDestinationItem({ Key key, @required this.destination, this.shape })
: assert(destination != null),
super(key: key);
final TravelDestination destination;
final ShapeBorder shape;
@override
_SelectableTravelDestinationItemState createState() => _SelectableTravelDestinationItemState();
}
class _SelectableTravelDestinationItemState extends State<SelectableTravelDestinationItem> {
// This height will allow for all the Card's content to fit comfortably within the card.
static const double height = 298.0;
bool _isSelected = false;
@override
Widget build(BuildContext context) {
final ColorScheme colorScheme = Theme.of(context).colorScheme;
return SafeArea(
top: false,
bottom: false,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
const SectionTitle(title: 'Selectable (long press)'),
SizedBox(
height: height,
child: Card(
// This ensures that the Card's children (including the ink splash) are clipped correctly.
clipBehavior: Clip.antiAlias,
shape: widget.shape,
child: InkWell(
onLongPress: () {
print('Selectable card state changed');
setState(() {
_isSelected = !_isSelected;
});
},
// Generally, material cards use onSurface with 12% opacity for the pressed state.
splashColor: colorScheme.onSurface.withOpacity(0.12),
// Generally, material cards do not have a highlight overlay.
highlightColor: Colors.transparent,
child: Stack(
children: <Widget>[
Container(
color: _isSelected
// Generally, material cards use primary with 8% opacity for the selected state.
// See: https://material.io/design/interaction/states.html#anatomy
? colorScheme.primary.withOpacity(0.08)
: Colors.transparent,
),
TravelDestinationContent(destination: widget.destination),
Align(
alignment: Alignment.topRight,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Icon(
Icons.check_circle,
color: _isSelected ? colorScheme.primary : Colors.transparent,
),
),
),
],
),
),
),
),
],
),
),
);
}
}
class SectionTitle extends StatelessWidget {
const SectionTitle({
Key key,
this.title,
}) : super(key: key);
final String title;
@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.fromLTRB(4.0, 4.0, 4.0, 12.0),
child: Align(
alignment: Alignment.centerLeft,
child: Text(title, style: Theme.of(context).textTheme.subtitle1),
),
);
}
}
class TravelDestinationContent extends StatelessWidget {
const TravelDestinationContent({ Key key, @required this.destination })
: assert(destination != null),
super(key: key);
final TravelDestination destination;
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
final TextStyle titleStyle = theme.textTheme.headline5.copyWith(color: Colors.white);
final TextStyle descriptionStyle = theme.textTheme.subtitle1;
final ButtonStyle textButtonStyle = TextButton.styleFrom(primary: Colors.amber.shade500);
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
// Photo and title.
SizedBox(
height: 184.0,
child: Stack(
children: <Widget>[
Positioned.fill(
// In order to have the ink splash appear above the image, you
// must use Ink.image. This allows the image to be painted as part
// of the Material and display ink effects above it. Using a
// standard Image will obscure the ink splash.
child: Ink.image(
image: AssetImage(destination.assetName, package: destination.assetPackage),
fit: BoxFit.cover,
child: Container(),
),
),
Positioned(
bottom: 16.0,
left: 16.0,
right: 16.0,
child: FittedBox(
fit: BoxFit.scaleDown,
alignment: Alignment.centerLeft,
child: Text(
destination.title,
style: titleStyle,
),
),
),
],
),
),
// Description and share/explore buttons.
Padding(
padding: const EdgeInsets.fromLTRB(16.0, 16.0, 16.0, 0.0),
child: DefaultTextStyle(
softWrap: false,
overflow: TextOverflow.ellipsis,
style: descriptionStyle,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
// three line description
Padding(
padding: const EdgeInsets.only(bottom: 8.0),
child: Text(
destination.description,
style: descriptionStyle.copyWith(color: Colors.black54),
),
),
Text(destination.city),
Text(destination.location),
],
),
),
),
if (destination.type == CardDemoType.standard)
// share, explore buttons
ButtonBar(
alignment: MainAxisAlignment.start,
children: <Widget>[
TextButton(
style: textButtonStyle,
onPressed: () { print('pressed'); },
child: Text('SHARE', semanticsLabel: 'Share ${destination.title}'),
),
TextButton(
style: textButtonStyle,
onPressed: () { print('pressed'); },
child: Text('EXPLORE', semanticsLabel: 'Explore ${destination.title}'),
),
],
),
],
);
}
}
class CardsDemo extends StatefulWidget {
static const String routeName = '/material/cards';
@override
_CardsDemoState createState() => _CardsDemoState();
}
class _CardsDemoState extends State<CardsDemo> {
ShapeBorder _shape;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Cards'),
actions: <Widget>[
MaterialDemoDocumentationButton(CardsDemo.routeName),
IconButton(
icon: const Icon(
Icons.sentiment_very_satisfied,
semanticLabel: 'update shape',
),
onPressed: () {
setState(() {
_shape = _shape != null ? null : const RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(16.0),
topRight: Radius.circular(16.0),
bottomLeft: Radius.circular(2.0),
bottomRight: Radius.circular(2.0),
),
);
});
},
),
],
),
body: Scrollbar(
child: ListView(
padding: const EdgeInsets.only(top: 8.0, left: 8.0, right: 8.0),
children: destinations.map<Widget>((TravelDestination destination) {
Widget child;
switch (destination.type) {
case CardDemoType.standard:
child = TravelDestinationItem(destination: destination, shape: _shape);
break;
case CardDemoType.tappable:
child = TappableTravelDestinationItem(destination: destination, shape: _shape);
break;
case CardDemoType.selectable:
child = SelectableTravelDestinationItem(destination: destination, shape: _shape);
break;
}
return Container(
margin: const EdgeInsets.only(bottom: 8.0),
child: child,
);
}).toList(),
),
),
);
}
}
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