o7planning

Flutter Spacer Tutorial

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1- Flutter Spacer

Spacer creates an empty, adjustable space which is used to adjust the spacing between child Widget(s) in a Flex container such as Column, Row, etc.
Spacer Constructor
const Spacer(
    {Key key,
    int flex: 1}
)
For example:
Row (
  children: <Widget>[
    Text('Begin'),
    Spacer(), // Defaults to a flex of one.
    Text('Middle'),
    // Gives twice the space between Middle and End than Begin and Middle.
    Spacer(flex: 2),
    Text('End'),
  ],
)
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 Spacer Example")
        ),
        body: Center (
            child: Row(
              children: <Widget>[
                Text('Begin'),
                Spacer(), // Defaults to a flex of one.
                Text('Middle'),
                // Gives twice the space between Middle and End than Begin and Middle.
                Spacer(flex: 2),
                Text('End'),
              ],
            )
        )
    );
  }
}

2- flex

flex property is considered as the weight of the Spacer. It determines how much space will be allocated to the Spacer. The allocated space is proportional to the flex value. The default value of flex is 1.
int flex: 1
flex (ex1)
Column (
  children: <Widget>[
    Icon(Icons.ac_unit, size: 32),
    Spacer(), // flex : 1 (Default)
    Icon(Icons.ac_unit, size: 36),
    Spacer(flex: 2),
    Icon(Icons.ac_unit, size: 48),
    Spacer(flex: 3),
    Icon(Icons.ac_unit, size: 24),
  ],
)

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