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[Material] Update the card demo in the Gallery to demonstrate different uses of the Card widget (#27699)

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Additionally, this adds a tappable Card example to the Card documentation.
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rami-a 2019-02-12 16:56:47 -05:00 committed by GitHub
parent f021ee27be
commit c348be9739
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2 changed files with 325 additions and 109 deletions
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413
examples/flutter_gallery/lib/demo/material/cards_demo.dart
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@ -9,152 +9,338 @@ import '../../gallery/demo.dart';
const String _kGalleryAssetsPackage = 'flutter_gallery_assets';
enum CardDemoType {
standard,
tappable,
selectable,
}
class TravelDestination {
const TravelDestination({
this.assetName,
this.assetPackage,
this.title,
this.description,
});
@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 List<String> description;
bool get isValid => assetName != null && title != null && description?.length == 3;
final String description;
final String city;
final String location;
final CardDemoType type;
}
final List<TravelDestination> destinations = <TravelDestination>[
const TravelDestination(
const List<TravelDestination> destinations = <TravelDestination>[
TravelDestination(
assetName: 'places/india_thanjavur_market.png',
assetPackage: _kGalleryAssetsPackage,
title: 'Top 10 Cities to Visit in Tamil Nadu',
description: <String>[
'Number 10',
'Thanjavur',
'Thanjavur, Tamil Nadu',
],
description: 'Number 10',
city: 'Thanjavur',
location: 'Thanjavur, Tamil Nadu',
),
const TravelDestination(
TravelDestination(
assetName: 'places/india_chettinad_silk_maker.png',
assetPackage: _kGalleryAssetsPackage,
title: 'Artisans of Southern India',
description: <String>[
'Silk Spinners',
'Chettinad',
'Sivaganga, Tamil Nadu',
],
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 {
TravelDestinationItem({ Key key, @required this.destination, this.shape })
: assert(destination != null && destination.isValid),
const TravelDestinationItem({ Key key, @required this.destination, this.shape })
: assert(destination != null),
super(key: key);
static const double height = 366.0;
// 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');
},
splashColor: Theme.of(context).colorScheme.primary.withAlpha(30),
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) {
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;
});
},
splashColor: Theme.of(context).colorScheme.primary.withAlpha(30),
child: Stack(
children: <Widget>[
Container(
color: _isSelected
? Theme.of(context).colorScheme.primary.withAlpha(41)
: Colors.transparent,
),
TravelDestinationContent(destination: widget.destination),
Align(
alignment: Alignment.topRight,
child: Padding(
padding: const EdgeInsets.all(4.0),
child: Icon(
Icons.check_circle,
color: _isSelected ? Colors.white : 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.subhead),
),
);
}
}
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.headline.copyWith(color: Colors.white);
final TextStyle descriptionStyle = theme.textTheme.subhead;
return SafeArea(
top: false,
bottom: false,
child: Container(
padding: const EdgeInsets.all(8.0),
height: height,
child: Card(
clipBehavior: Clip.antiAlias,
shape: shape,
final List<Widget> 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>[
// photo and title
SizedBox(
height: 184.0,
child: Stack(
children: <Widget>[
Positioned.fill(
child: Image.asset(
destination.assetName,
package: destination.assetPackage,
fit: BoxFit.cover,
),
),
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
Expanded(
child: 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[0],
style: descriptionStyle.copyWith(color: Colors.black54),
),
),
Text(destination.description[1]),
Text(destination.description[2]),
],
),
),
),
),
// share, explore buttons
ButtonTheme.bar(
child: ButtonBar(
alignment: MainAxisAlignment.start,
children: <Widget>[
FlatButton(
child: Text('SHARE', semanticsLabel: 'Share ${destination.title}'),
textColor: Colors.amber.shade500,
onPressed: () { /* do nothing */ },
),
FlatButton(
child: Text('EXPLORE', semanticsLabel: 'Explore ${destination.title}'),
textColor: Colors.amber.shade500,
onPressed: () { /* do nothing */ },
),
],
// 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) {
children.add(
// share, explore buttons
ButtonTheme.bar(
child: ButtonBar(
alignment: MainAxisAlignment.start,
children: <Widget>[
FlatButton(
child: Text('SHARE', semanticsLabel: 'Share ${destination.title}'),
textColor: Colors.amber.shade500,
onPressed: () { print('pressed'); },
),
FlatButton(
child: Text('EXPLORE', semanticsLabel: 'Explore ${destination.title}'),
textColor: Colors.amber.shade500,
onPressed: () { print('pressed'); },
),
],
),
),
);
}
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: children,
);
}
}
class CardsDemo extends StatefulWidget {
static const String routeName = '/material/cards';
@ -169,7 +355,7 @@ class _CardsDemoState extends State<CardsDemo> {
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Travel stream'),
title: const Text('Cards'),
actions: <Widget>[
MaterialDemoDocumentationButton(CardsDemo.routeName),
IconButton(
@ -193,15 +379,24 @@ class _CardsDemoState extends State<CardsDemo> {
],
),
body: ListView(
itemExtent: TravelDestinationItem.height,
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: TravelDestinationItem(
destination: destination,
shape: _shape,
),
child: child,
);
}).toList()
)

21
packages/flutter/lib/src/material/card.dart
View File

@ -56,6 +56,27 @@ import 'theme.dart';
/// ```
/// {@end-tool}
///
/// Sometimes the primary action area of a card is the card itself. Cards can be
/// one large touch target that shows a detail screen when tapped.
///
/// {@tool snippet --template=stateless_widget}
///
/// This sample shows creation of a [Card] widget that can be tapped. When
/// tapped this [Card]'s [InkWell] displays an "ink splash" that fills the
/// entire card.
///
/// ```dart
/// Card(
/// child: InkWell(
/// splashColor: Colors.blue.withAlpha(30),
/// onTap: () { /* ... */ },
/// child: Text('A card that can be tapped'),
/// ),
/// )
/// ```
///
/// {@end-tool}
///
/// See also:
///
/// * [ListTile], to display icons and text in a card.