Creating a Custom widget in Flutter

Question

import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';

int _weight =60;

class RoundIconData extends StatefulWidget {

@override
_RoundIconDataState createState() => _RoundIconDataState();
}
class _RoundIconDataState extends State<RoundIconData> {

RoundIconData({@required this.icon,@required this.pressme});
final IconData icon;
final int pressme;

@override
Widget build(BuildContext context) {
 return RawMaterialButton(
   child: Icon(icon),
   onPressed: (){
    setState(() {
      if(icon == FontAwesomeIcons.minus){
        _weight--;
      }
      else{
        _weight++
      }
    });
  },
  elevation: 6.0,
  constraints: BoxConstraints.tightFor(
    width: 56.0,
    height: 56.0,
  ),
  shape: CircleBorder(),
  fillColor: Color(0xFF4C4F5E),
);
}
}

i am getting error while creating this.

What i Want

Custom widget with RawmaterialButton through which i can add icons. if i add icon.minus then my given private weight wants to be decremented else given private weights to be incremented

Hi, Asbah! Please, edit your question and add the error you're getting creating this and when it happens so we can understand your issue and help you. Best regards! — George Rappel
– George Rappel, Commented Dec 18, 2019 at 16:09

chunhunghan · Accepted Answer · 2019-12-18 07:30:20Z

You can copy paste run full code below
You have to move the following code to RoundIconData

RoundIconData({@required this.icon,@required this.pressme});
final IconData icon;
final int pressme;

and pass callback for refresh

working demo

full code

import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

int weight = 60;

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  refresh() {
    setState(() {});
  }

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            RoundIconData(
              icon: Icon(FontAwesomeIcons.minus),
              notifyParent: refresh,
            ),
            RoundIconData(
              icon: Icon(Icons.add),
              notifyParent: refresh,
            ),
            Text(
              '${weight}',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

class RoundIconData extends StatefulWidget {
  final Icon icon;
  final int pressme;
  final Function() notifyParent;

  RoundIconData(
      {@required this.icon,
      @required this.pressme,
      @required this.notifyParent});
  @override
  _RoundIconDataState createState() => _RoundIconDataState();
}

class _RoundIconDataState extends State<RoundIconData> {
  @override
  Widget build(BuildContext context) {
    return RawMaterialButton(
      child: widget.icon,
      onPressed: () {
        print(widget.icon.toString());
        print(Icon(FontAwesomeIcons.minus).toString());
        if (widget.icon.toString() == Icon(FontAwesomeIcons.minus).toString()) {
          weight--;
          widget.notifyParent();
          print(weight);
        } else {
          weight++;
          widget.notifyParent();
          print(weight);
        }
      },
      elevation: 6.0,
      constraints: BoxConstraints.tightFor(
        width: 56.0,
        height: 56.0,
      ),
      shape: CircleBorder(),
      fillColor: Color(0xFF4C4F5E),
    );
  }
}

Md.Atikul Islam Asad · Accepted Answer · 2022-06-14 18:49:32Z

Creating a Custom widget in Flutter

 import 'package:flutter/material.dart';
    
    
    class WelcomePage extends StatelessWidget {
      // This widget is the root of your application.
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          debugShowCheckedModeBanner: false,
          title: 'Flutter Auth',
          theme: ThemeData(
            primaryColor: Colors.purple,
            scaffoldBackgroundColor: Colors.white,
          ),
          home:Scaffold(
            body: Center(
              child: SingleChildScrollView(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Text(
                      "WELCOME TO XYZ",
                      style: TextStyle(fontWeight: FontWeight.bold,color: Colors.purple,fontSize: 25),
                    ),
                    Padding(
                      padding: const EdgeInsets.only(right: 40),
                      child: Image.asset(
                        "assets/images/food_order.png",
                        height: 200,
                      ),
                    ),
                    SizedBox(height: 10 ),
                    loginMethod(),
                    signUpMethod(),
                  ],
              ),
            ),
            ),
          ),
        );
      }
    
      // Login Button Method Widget
      Widget loginMethod(){
        return Container(
          margin: EdgeInsets.symmetric(vertical: 10),
          width: 200,
          height: 50,
          child: ClipRRect(
            borderRadius: BorderRadius.circular(29),
            child: FlatButton(
              padding: EdgeInsets.symmetric(vertical: 10, horizontal: 40),
              color: Colors.blue,
              onPressed: (){},
              child: Text(
                'Login',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
        );
      }
    
      // Signup button method widget
      Widget signUpMethod (){
        return Container(
          margin: EdgeInsets.symmetric(vertical: 10),
          width: 200,
          height: 50,
          child: ClipRRect(
            borderRadius: BorderRadius.circular(29),
            child: FlatButton(
              padding: EdgeInsets.symmetric(vertical: 10, horizontal: 40),
              color: Colors.blue,
              onPressed: (){},
              child: Text(
                'Sign up',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
        );
      }
    
    }

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