o7planning

Flutter Card Tutorial

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1- Card

In Flutter, Card is a widget that is used to create a rectangular area with four rounded corners and a shadow effect on its edges. Card contains information such as album, geographic location, contact details, ...
Card Constructor
const Card(
  {Key key,
  Widget child,
  Color color,
  Color shadowColor,
  double elevation,
  ShapeBorder shape,
  bool borderOnForeground: true,
  EdgeInsetsGeometry margin,
  Clip clipBehavior,
  bool semanticContainer: true}
)
Example:
main.dart (ex1)
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'o7planning.org',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: Text("Flutter Card Example")
      ),
      body: Card (
        margin: EdgeInsets.all(10),
        color: Colors.green[100],
        shadowColor: Colors.blueGrey,
        elevation: 10,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            const ListTile(
              leading: Icon (
                  Icons.album,
                  color: Colors.cyan,
                  size: 45
              ),
              title: Text(
                "Let's Talk About Love",
                style: TextStyle(fontSize: 20),
              ),
              subtitle: Text('Modern Talking Album'),
            ),
          ],
        ),
      ),
    );
  }
}
If you want to customize Card size, put it in a Container or SizedBox.
SizedBox (
  width: 300,
  height: 200,
  child: Card (
    margin: EdgeInsets.all(10),
    color: Colors.green[100],
    shadowColor: Colors.blueGrey,
    elevation: 10,
    child: Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        const ListTile(
          leading: Icon (
              Icons.album,
              color: Colors.cyan,
              size: 45
          ),
          title: Text(
            "Let's Talk About Love",
            style: TextStyle(fontSize: 20),
          ),
          subtitle: Text('Modern Talking Album'),
        ),
      ],
    ),
  ),
)

2- Card Example

A Card example with more complex interface:
main.dart (ex3)
import 'package:flutter/material.dart';
import 'dart:async';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'o7planning.org',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({Key key}) : super(key: key);

  Future<Widget> getImage() async {
    final Completer<Widget> completer = Completer();
    final url = 'https://s3.o7planning.com/images/ha-long-bay.png';
    final image = NetworkImage(url);
    //
    final load = image.resolve(const ImageConfiguration());
    
    // Delay 1 second.
    await Future.delayed(Duration(seconds: 1));

    final listener = new ImageStreamListener((ImageInfo info, isSync) async {
      print(info.image.width);
      print(info.image.height);
      completer.complete(Container(child: Image(image: image)));
    });

    load.addListener(listener);
    return completer.future;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text("Flutter Card Example")
        ),
        body: Container(
            margin: EdgeInsets.all(10) ,
            child: Column(
              children: <Widget>[
                Card(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      const ListTile(
                        leading: Icon(Icons.place),
                        title: Text('Ha Long Bay'),
                        subtitle: Text('Halong Bay is a UNESCO World Heritage Site and a popular tourist destination'),
                      ),
                      Container(
                        alignment: Alignment.center,
                        child: FutureBuilder<Widget>(
                          future: getImage(),
                          builder: (context, snapshot) {
                            if (snapshot.hasData) {
                              return snapshot.data;
                            } else {
                              return Text('LOADING...');
                            }
                          },
                        ),
                      ) ,
                      ButtonBarTheme ( // make buttons use the appropriate styles for cards
                        data: ButtonBarThemeData(),
                        child: ButtonBar(
                          children: <Widget>[
                            TextButton(
                              child: const Text('Add to Bookmark'),
                              onPressed: () {},
                            ),
                            TextButton(
                              child: const Text('Show More'),
                              onPressed: () {},
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                  elevation: 10,
                ),
              ],
            )
        )
    );
  }
}

3- child

Widget child

4- color

color property is used to set background color of Card.
If this property is null then CardTheme.color of ThemeData.cardTheme is used. If CardTheme.color is also null then ThemeData.cardColor is used.
Color color

5- shadowColor

shadowColor is the color used to draw shadows of the Card.
Color shadowColor

6- elevation

elevation is the coordinates along the Z axis of Card, which affects the size of Card's shadow.
If this property is null, then CardTheme.elevation of ThemeData.cardTheme is used. If CardTheme.elevation is also null, then the default value is 1.0.
double elevation
Example:
elevation (ex1)
Card (
  margin: EdgeInsets.all(10),
  color: Colors.green[100],
  shadowColor: Colors.blueGrey,
  elevation: 20,
  child: Column(
    mainAxisSize: MainAxisSize.min,
    children: <Widget>[
      const ListTile(
        leading: Icon (
            Icons.album,
            color: Colors.cyan,
            size: 45
        ),
        title: Text(
          "Let's Talk About Love",
          style: TextStyle(fontSize: 20),
        ),
        subtitle: Text('Modern Talking Album'),
      ),
    ],
  ),
)

7- shape

shape property is used to define border shape of Card.
If this property is null then CardTheme.shape of ThemeData.cardTheme is used. If CardTheme.shape is also null then the shape will be a RoundedRectangleBorder with a circular corner radius of 4.0.
ShapeBorder shape
  • TODO Link?
Example:
shape (ex1)
Card (
  margin: EdgeInsets.all(10),
  elevation: 20,
  shape: RoundedRectangleBorder(
      side:  BorderSide(color: Colors.green,width: 3),
      borderRadius: BorderRadius.all(Radius.circular(15))
  ),
  shadowColor: Colors.green[100],
  child: Column(
    mainAxisSize: MainAxisSize.min,
    children: <Widget>[
      const ListTile(
        leading: Icon (
            Icons.album,
            color: Colors.cyan,
            size: 45
        ),
        title: Text(
          "Let's Talk About Love",
          style: TextStyle(fontSize: 20),
        ),
        subtitle: Text('Modern Talking Album'),
      ),
    ],
  ),
)

8- borderOnForeground

If borderOnForeground is trueshape's border will be drawn in front of the child. Vice versa, a border will be drawn behind the child.
bool borderOnForeground: true

9- margin

margin property is used to create an empty space around Card.
EdgeInsetsGeometry margin

10- semanticContainer

If semanticContainer is true, it means that Card and all its child widgets have the same semantic. On the contrary, their semantics are different.
bool semanticContainer: true

11- clipBehavior

Clip clipBehavior
  • TODO Link?

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