Flutter is all about widgets and everything is a widget in Flutter So, In today's tutorial, we will see how we can build a custom widget in Flutter.
Building custom widgets can reduce boilerplate code and the same widget can be used in different places which makes our application lighter.
Let's Start
Step 1: Create a new Flutter Application.
Step 2: Now for this tutorial, we will be building a custom button widget as buttons are used everywhere in mobile apps. So, inside our body first, create a button using Container and different widgets for example
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Container( margin: const EdgeInsets.symmetric(horizontal: 20), decoration: BoxDecoration( color: Colors.blue, border: Border.all(color: Colors.white), borderRadius: BorderRadius.circular(borderRadius ?? 0)), child: Material( color: Colors.transparent, child: InkWell( onTap: (){}, child: Container( padding: const EdgeInsets.all(20), child: Center( child: Text( 'first button', style: TextStyle( color: Colors.white, fontSize: 16, fontWeight: FontWeight.w400), ), ), ), ), ), ); |
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Step 3: Once you have your button widget Right-Click on the top-level Container/widget and choose Extract as Widget Option, when you click on it you will be asked to name it, and once done you will have a new stateless widget created.
Now Declare Variables that you want to change and add it the constructor
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CustomButton({ required this.onTap, this.borderRadius, this.buttonColor, this.textColor, this.borderColor, required this.buttonText, Key? key, }) : super(key: key);
VoidCallback onTap; Color? buttonColor; double? borderRadius; Color? textColor; String buttonText; Color? borderColor; |
Now you can use these properties in your custom button to change the look and behavior of the button for example:
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import 'package:flutter/material.dart';
class CustomButton extends StatelessWidget { CustomButton({ required this.onTap, this.borderRadius, this.buttonColor, this.textColor, this.borderColor, required this.buttonText, Key? key, }) : super(key: key);
VoidCallback onTap; Color? buttonColor; double? borderRadius; Color? textColor; String buttonText; Color? borderColor;
@override Widget build(BuildContext context) { return Container( margin: const EdgeInsets.symmetric(horizontal: 20), decoration: BoxDecoration( color: buttonColor ?? Colors.white, border: Border.all(color: borderColor ?? Colors.white), borderRadius: BorderRadius.circular(borderRadius ?? 0)), child: Material( color: Colors.transparent, child: InkWell( onTap: onTap, child: Container( padding: const EdgeInsets.all(20), child: Center( child: Text( buttonText, style: TextStyle( color: textColor, fontSize: 16, fontWeight: FontWeight.w400), ), ), ), ), ), ); } }
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Step 4: Now we can use this Widget as a custom button widget where we want a button in our application. Simply call the CustomWidget and give the properties that you want for example:
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CustomButton( onTap: () {}, buttonText: 'New Button', textColor: Colors.white, borderRadius: 10, buttonColor: Colors.black, borderColor: Colors.white, ), |
Complete Source Code to create custom reusable widget in flutter
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import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:flutter_custom_widget_demo/widget/custom_button.dart';
class DemoApp extends StatelessWidget { const DemoApp({Key? key}) : super(key: key);
@override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( backgroundColor: Colors.black, title: const Text('Custom Widget in Flutter'), ), body: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ CustomButton( onTap: () {}, buttonText: 'First Button', buttonColor: Colors.blue, textColor: Colors.white, borderRadius: 10, ), const SizedBox( height: 30, ), Row( children: [ Expanded( child: CustomButton( onTap: () {}, buttonText: 'second Button', textColor: Colors.black, borderRadius: 0, borderColor: Colors.red, ), ), Expanded( child: CustomButton( onTap: () {}, buttonText: 'New Button', textColor: Colors.white, borderRadius: 10, buttonColor: Colors.black, borderColor: Colors.white, ), ) ], ), const SizedBox( height: 30, ), CustomButton( onTap: () {}, buttonText: 'Last Button', textColor: Colors.green, buttonColor: Colors.greenAccent.shade100, borderRadius: 30, ) ], ), ); } }
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Output:
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Conclusion: In this way, we have learned how we can create a custom reusable widget in Flutter.
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