Layouts

Layouts
- Container
- Row
  - MainAxisAlignment
  - CrossAxisAlignment
- Column
  - MainAxisAlignment
  - CrossAxisAlignment
- Center
- Align
- Padding
- SizedBox
- Expanded
- Flexible
- ConstrainedBox
- Stack
- Wrap
- Positioned
- ListView
  - Simple
  - Divider
  - Card
- Text
- Icon
Material
Utilities

Layouts

Container

Container(
  padding: const EdgeInsets.all(0.0),
  color: Colors.cyanAccent,
  width: 80.0,
  height: 80.0,
),

Row

MainAxisAlignment

Note: The below example is with CrossAxisAlignment.center

.center	.start	.end

.spaceEvenly	.spaceAround	.spaceBetween

CrossAxisAlignment

.center	.start	.end	.stretch

Row(
  mainAxisAlignment: MainAxisAlignment.center,
  mainAxisSize: MainAxisSize.max,
  crossAxisAlignment: CrossAxisAlignment.center,
  children: <Widget>[
  Container(
    padding: const EdgeInsets.all(0.0),
    color: Colors.cyanAccent,
    width: 80.0,
    height: 80.0,
  ),
  Container(
    padding: const EdgeInsets.all(0.0),
    color: Colors.blueAccent,
    width: 80.0,
    height: 80.0,
  ),
  Container(
    padding: const EdgeInsets.all(0.0),
    color: Colors.orangeAccent,
    width: 80.0,
    height: 80.0,
  ),
  ],
),

Column

MainAxisAlignment

Note: The below example is with CrossAxisAlignment.center

.center	.start	.end	.spaceEvenly	.spaceAround	.spaceBetween

CrossAxisAlignment

.center	.start	.end	.stretch

Column(
  mainAxisAlignment: MainAxisAlignment.center,
  mainAxisSize: MainAxisSize.max,
  crossAxisAlignment: CrossAxisAlignment.center,
  children: <Widget>[
    Container(
      padding: const EdgeInsets.all(0.0),
      color: Colors.cyanAccent,
      width: 80.0,
      height: 80.0,
    ),
    Container(
      padding: const EdgeInsets.all(0.0),
      color: Colors.blueAccent,
      width: 80.0,
      height: 80.0,
    ),
    Container(
      padding: const EdgeInsets.all(0.0),
      color: Colors.orangeAccent,
      width: 80.0,
      height: 80.0,
    ),
  ],
),

Center

Center(child: Container(
  padding: const EdgeInsets.all(0.0),
  color: Colors.cyanAccent,
  width: 80.0,
  height: 80.0,
))

Note: Center wraps any widget to center to its parent widget. (i.e orange is the parent widget)

Align

.topLeft	.topCenter	.topRight

.centerLeft	.center	.centerRight

.bottomLeft	.bottomCenter	.bottomRight

Align(
  alignment: Alignment.center, 
  child: Container(
  padding: const EdgeInsets.all(0.0),
  color: Colors.cyanAccent,
  width: 80.0,
  height: 80.0,
))

Note: Align wraps any widget based on the Alignment direction to its parent widget. The default alignment for Align is center.

Padding

Padding(
  padding: EdgeInsets.fromLTRB(24, 32, 24, 32) ,
  child: Container(
  padding: const EdgeInsets.all(0.0),
  color: Colors.cyanAccent,
  width: 80.0,
  height: 80.0,
))

SizedBox

SizedBox(
  width: 200.0,
  height: 100.0,
  child: Card(
    color: Colors.indigoAccent,
    child: Center(
        child: Text('SizedBox',
            style: TextStyle(color: Colors.white)
         )
       )
     )
   )

Note: SizedBox constraints its child widget to match based on specific size of width and height.

Expanded

Row	Column

Row(
  mainAxisAlignment: MainAxisAlignment.center,
  mainAxisSize: MainAxisSize.max,
  crossAxisAlignment: CrossAxisAlignment.center,
  children: <Widget>[
    Expanded(
      child: Container(color: Colors.cyan, height: 80),
      flex: 2,
    ),
    Expanded(
      child: Container(color: Colors.indigoAccent, height: 80),
      flex: 3,
    ),
    Expanded(
      child: Container(color: Colors.orange, height: 80),
      flex: 4,
    ),
  ],
),

Flexible

Row	Column

Row(
  mainAxisAlignment: MainAxisAlignment.center,
  mainAxisSize: MainAxisSize.max,
  crossAxisAlignment: CrossAxisAlignment.center,
  children: <Widget>[
    Flexible(
      child: Container(color: Colors.cyanAccent, height: 80, width: 80),
      flex: 2,
    ),
    Flexible(
    child: Container(color: Colors.indigoAccent, height: 80, width: 80),
      flex: 3,
    ),
    Flexible(
      child: Container(color: Colors.orange, height: 80, width: 80),
      flex: 4,
    ),
  ],
),

Hint:

To make Flexible behave similar to Expanded, then add fit: FlexFit.tight
By default fit type for Flexible is fit: FlexFit.loose.

ConstrainedBox

Expand	Expand with Height	Tight	Loose

`BoxConstraints.expand()`	`BoxConstraints.expand(height: 100)`	`BoxConstraints.tight(Size(125, 100))`	`BoxConstraints.loose(Size(125, 100))`

ConstrainedBox(
  constraints: BoxConstraints.expand(height: 100),
  child: Container(
    color: Colors.orange,
    child: Padding(padding: EdgeInsets.all(16), child: Text('Box Constraint', style: TextStyle(color: Colors.white),)),
))

Stack

AlignmentDirectional.centerStart	AlignmentDirectional.center	AlignmentDirectional.centerEnd

AlignmentDirectional.bottomStart	AlignmentDirectional.bottomCenter	AlignmentDirectional.bottomEnd

AlignmentDirectional.topStart	AlignmentDirectional.topCenter	AlignmentDirectional.topEnd

Stack(
  alignment: AlignmentDirectional.center,
    children: [
      Container(
        height: 200.0,
        width: 200.0,
        color: Colors.red,
      ),
      Container(
        height: 150.0,
        width: 150.0,
        color: Colors.blue,
      ),
      Container(
        height: 100.0,
        width: 100.0,
        color: Colors.green,
      ),
      Container(
        height: 50.0,
        width: 50.0,
        color: Colors.yellow,
      ),
    ],
),

Credits: Fore more detailed blog post for this. Please visit https://medium.com/flutter-community/flutter-for-android-developers-how-to-design-framelayout-in-flutter-93a19fc7e7a6

Wrap

Wrap(
  spacing: 4.0, // gap between lines
  children: <Widget>[
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.orange, child: Text('C', style: TextStyle(color: Colors.white))),
      label: Text('Cupcake'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.cyanAccent, child: Text('D', style: TextStyle(color: Colors.black45))),
      label: Text('Donut'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.indigoAccent, child: Text('E', style: TextStyle(color: Colors.white))),
      label: Text('Eclair'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.yellowAccent, child: Text('F', style: TextStyle(color: Colors.black45))),
      label: Text('Froyo'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.green, child: Text('G', style: TextStyle(color: Colors.white))),
      label: Text('Gingerbread'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.redAccent, child: Text('H', style: TextStyle(color: Colors.white))),
      label: Text('Honeycomb'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.greenAccent, child: Text('I', style: TextStyle(color: Colors.black45))),
      label: Text('Ice cream Sandwich'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.deepOrangeAccent, child: Text('J', style: TextStyle(color: Colors.white))),
      label: Text('Jelly Bean'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.indigo, child: Text('K', style: TextStyle(color: Colors.white))),
      label: Text('Kit Kat'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.tealAccent, child: Text('L', style: TextStyle(color: Colors.black45))),
      label: Text('Lollipop'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.amberAccent, child: Text('M', style: TextStyle(color: Colors.white))),
      label: Text('Marshmallow'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.cyan, child: Text('N', style: TextStyle(color: Colors.white))),
      label: Text('Nougat'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.red, child: Text('O', style: TextStyle(color: Colors.white))),
      label: Text('Oreo'),
      backgroundColor: Colors.white,
    ),
    Chip(
      avatar: CircleAvatar(backgroundColor: Colors.greenAccent, child: Text('P', style: TextStyle(color: Colors.black45))),
      label: Text('Pie'),
      backgroundColor: Colors.white,
    ),
  ],
)

Positioned

ConstrainedBox(
  constraints: BoxConstraints.tight(Size(double.infinity, 256)),
  child: Stack(
    alignment: AlignmentDirectional.center,
    children: <Widget>[
      Positioned(
        top: 0.0,
        child: Icon(Icons.calendar_today,
            size: 128.0, color: Colors.lightBlueAccent),
      ),
      Positioned(
          top: 4,
          right: 110,
          child: CircleAvatar(radius: 16, backgroundColor: Colors.red)),
    ],
  ),
)

ListView

Simple

  @override
  Widget build(BuildContext context) {
    List<String> names = ['Alpha', 'Beta', 'Cupcake', 'Donut', 'Eclair',
    'Froyo', 'Ginger bread', 'Honey comb', 'Ice cream sandwich', 'Jelly bean',
    'Kitkat', 'Lollipop', 'Marshmallow', 'Nougat', 'Oreo', 'Pie'
    ];
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: new Scaffold(
        appBar: AppBar(title: Text('ListView')),
          body: Center(
            child:
            new ListView.builder(
                itemCount: names.length,
                itemBuilder: (BuildContext context, int position) {
                  var name = names[position];
                  return ListTile(title: Text(name));
                }),
          )),
    );
  }

Divider

ListView.separated(
    itemBuilder: (BuildContext context, int position) {
      var name = names[position];
      return ListTile(title: Text(name));
    },
    separatorBuilder: (BuildContext context, int index) =>
        Divider(),
    itemCount: names.length),

Card

ListView.builder(
  itemCount: names.length,
  itemBuilder: (BuildContext context, int position) {
    var name = names[position];
    return Card(margin: EdgeInsets.fromLTRB(8, 4, 8, 4),child: ListTile(title: Text(name)));
  })

Text

new Text(
  "Flutter is Awesome",
  style: new TextStyle(
      fontSize: 18.0,
      color: Colors.greenAccent,
      fontWeight: FontWeight.w500,
      fontFamily: "Roboto"),
),

Icon

new Icon(Icons.flight_takeoff, color: Colors.blueAccent, size: 96.0),

Material

Button

Flat Button

FlatButton(
  onPressed: () {
    debugPrint('I am Awesome');
  },
  textColor: Colors.white,
  color: Colors.blueAccent,
  disabledColor: Colors.grey,
  disabledTextColor: Colors.white,
  highlightColor: Colors.orangeAccent,
  child: Text('Flat Button'),
),

Raised Button

RaisedButton(
  onPressed: () {
    debugPrint('I am Awesome');
  },
  textColor: Colors.white,
  color: Colors.blueAccent,
  disabledColor: Colors.grey,
  disabledTextColor: Colors.white,
  highlightColor: Colors.orangeAccent,
  elevation: 4.0,
  child: Text('Raised Button'),
),

Icon Button

IconButton(
  onPressed: () {
    debugPrint("Starred Me!");
  },
  color: Colors.orangeAccent,
  icon: Icon(Icons.star),
  disabledColor: Colors.grey,
  highlightColor: Colors.black38,
),

Floating Action Button

(FAB)

Normal	Mini

--------	`mini: true`

return Scaffold(
  floatingActionButton: new FloatingActionButton(
    mini: true,
    child: new Icon(Icons.add),
    onPressed: () {},
  ),
);

DropdownButton

DropdownButton	DropdownMenuItem

import 'package:flutter/material.dart';

class CustomDropDownWidget extends StatefulWidget {
  @override
  ChangeBGColorDropdownState createState() {
    return new ChangeBGColorDropdownState();
  }
}

class ChangeBGColorDropdownState extends State<CustomDropDownWidget> {
  List<DropDownItemModel> _dropDownItemModelList = [
    DropDownItemModel(versionName: "Cupcake"),
    DropDownItemModel(versionName: "Donut"),
    DropDownItemModel(versionName: "Eclair"),
    DropDownItemModel(versionName: "Froyo"),
  ];

  DropDownItemModel _dropDownItemModel;

  @override
  void initState() {
    super.initState();
    _dropDownItemModel = _dropDownItemModelList[0];
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Container(
            padding: EdgeInsets.fromLTRB(16, 0, 16, 0),
            color: Colors.orangeAccent,
            child: DropdownButton<DropDownItemModel>(
              underline: Container(
                decoration: const BoxDecoration(
                    border: Border(bottom: BorderSide(color: Colors.transparent))
                ),
              ),
              iconEnabledColor: Colors.white,
              items: _dropDownItemModelList
                  .map((dropDownItemModel) =>
                      DropdownMenuItem<DropDownItemModel>(
                        child: Text(dropDownItemModel.versionName),
                        value: dropDownItemModel,
                      ))
                  .toList(),
              onChanged: (DropDownItemModel dropDownItemModel) {
                setState(() => _dropDownItemModel = dropDownItemModel);
              },
              hint: Text(
                _dropDownItemModel.versionName,
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class DropDownItemModel {
  String versionName;

  DropDownItemModel({this.versionName});
}

Navigation Drawer

   @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          backgroundColor: AppColors.gradient_purple_begin,
          title: Text("XSpends")),
      drawer: new Drawer(
        child: new ListView(
          children: <Widget>[
            new UserAccountsDrawerHeader(
              accountName: new Text("TakeoffAndroid"),
              accountEmail: new Text("takeoffandroid@gmail.com"),
              currentAccountPicture: CircleAvatar(
                backgroundColor: Colors.yellow,
                child: Text('T', style: TextStyle(color: Colors.black87))
              ),
              decoration: new BoxDecoration(
                gradient: LinearGradient(
                    begin: Alignment.centerLeft,
                    end: Alignment.centerRight,
                    colors: [
                      AppColors.gradient_purple_begin,
                      AppColors.gradient_purple_end
                    ]),
              ),
            ),
            new ListTile(
                leading: Icon(Icons.home),
                title: new Text("Home"),
                onTap: () {
                  Navigator.pop(context);
                }),
            new ListTile(
                leading: Icon(Icons.person),
                title: new Text("Friends"),
                onTap: () {
                  Navigator.pop(context);
                }),
            new ListTile(
                leading: Icon(Icons.share),
                title: new Text("Share"),
                onTap: () {
                  Navigator.pop(context);
                }),
            new Divider(),
            new ListTile(
                leading: Icon(Icons.settings),
                title: new Text("Settings"),
                onTap: () {
                  Navigator.pop(context);
                }),
            new ListTile(
                leading: Icon(Icons.power_settings_new),
                title: new Text("Logout"),
                onTap: () {
                  Navigator.pop(context);
                }),
          ],
        ),
      ),
    );
  }

Input Field

TextField

(Text box or Edit Text)

Under Line Style

Simple	Icon

Prefix	Suffix

TextField(
  decoration: InputDecoration(
  hintText: "Enter your name!",
  hintStyle: TextStyle(fontWeight: FontWeight.w300, color: Colors.blue),
  enabledBorder: new UnderlineInputBorder(
      borderSide: new BorderSide(color: Colors.blue)),
  focusedBorder: UnderlineInputBorder(
    borderSide: BorderSide(color: Colors.orange),
  ),
  ),
)

Icon	Prefix	Suffix
`InputDecoration(icon: Icon(Icons.account_circle, color: Colors.blue))`	`InputDecoration(prefixIcon: Icon(Icons.account_circle, color: Colors.blue))`	`InputDecoration(suffixIcon: Icon(Icons.account_circle, color: Colors.blue))`

Outer Line Style

TextField(
  decoration: InputDecoration(
  hintText: "Enter your name!",
  hintStyle: TextStyle(fontWeight: FontWeight.w300, color: Colors.blue),
  enabledBorder: new OutlineInputBorder(
      borderSide: new BorderSide(color: Colors.blue)),
  focusedBorder: OutlineInputBorder(
    borderSide: BorderSide(color: Colors.orange),
  ),
  ),
)

Note: Icon, Prefix Icon and Suffix Icon are similar to Underline TextField

TextFormField

TextFormField(
  style: TextStyle(color: Colors.white),
    obscureText: true, // Use secure text for passwords.
    decoration: InputDecoration(
    enabledBorder: UnderlineInputBorder(borderSide: BorderSide(color: Colors.white)),
        focusedBorder: UnderlineInputBorder(
          borderSide: BorderSide(color: Colors.yellow)
    ),
    hintText: 'Password',
    hintStyle: TextStyle(color: Colors.white),
    labelText: 'Type your password',
    labelStyle: TextStyle(color: Colors.yellow))
)

References:

Utilities

Creates Color Utils

class AppColors {
  static const Color colorPrimary = Color.fromARGB(255, 51, 51, 51);
  static const Color colorPrimaryDark = Color.fromARGB(255, 41, 41, 41);
  static const Color colorAccent = Color.fromARGB(255, 30, 198, 89);
  static const Color yellow = Color.fromARGB(255, 252, 163, 38);
  static const Color orange = Color.fromARGB(255, 252, 109, 38);
  static const Color grey_unselected = Color.fromARGB(255, 96, 96, 96);
  static const Color white_card = Color.fromARGB(255, 250, 250, 250);
  static const Color chrome_grey = Color.fromARGB(255, 240, 240, 240);
  static const Color white = Color.fromARGB(255, 255, 255, 255);
  static const Color white_secondary = Color.fromARGB(255, 220, 220, 220);
  static const Color white_un_selected = Color.fromARGB(255, 180, 180, 180);
  static const Color indigo = Color.fromARGB(255, 51, 105, 231);
  static const Color primary_text = Color.fromARGB(255, 51, 51, 51);
  static const Color secondary_text = Color.fromARGB(255, 114, 114, 114);
  static const Color grey = Color.fromARGB(255, 188, 187, 187);
}

Name	Name	Last commit message	Last commit date
Latest commit History 375 Commits
media	media
.gitignore	.gitignore
CNAME	CNAME
LICENSE	LICENSE
README.md	README.md
_config.yml	_config.yml

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Uctech/flutter-examples

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Layouts

Container

Row

MainAxisAlignment

CrossAxisAlignment

Column

MainAxisAlignment

CrossAxisAlignment

Center

Align

Padding

SizedBox

Expanded

Flexible

ConstrainedBox

Stack

Wrap

Positioned

ListView

Simple

Divider

Card

Text

Icon

Material

Button

Flat Button

Raised Button

Icon Button

Floating Action Button

(FAB)

DropdownButton

Navigation Drawer

Input Field

TextField

Under Line Style

Outer Line Style

TextFormField

Utilities

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