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Flutter_Documentation

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that follow Material Design. A Material app starts with the
MaterialApp widget, which builds a number of useful widgets
at the root of your app, including a Navigator,
which manages a stack of widgets identified by strings,
also known as “routes”. The Navigator lets you transition smoothly
between screens of your application. Using the MaterialApp
widget is entirely optional but a good practice.
<code_start>import 'package:flutter/material.dart';
void main() {
runApp(
const MaterialApp(
title: 'Flutter Tutorial',
home: TutorialHome(),
),
);
}
class TutorialHome extends StatelessWidget {
const TutorialHome({super.key});
@override
Widget build(BuildContext context) {
// Scaffold is a layout for
// the major Material Components.
return Scaffold(
appBar: AppBar(
leading: const IconButton(
icon: Icon(Icons.menu),
tooltip: 'Navigation menu',
onPressed: null,
),
title: const Text('Example title'),
actions: const [
IconButton(
icon: Icon(Icons.search),
tooltip: 'Search',
onPressed: null,
),
],
),
// body is the majority of the screen.
body: const Center(
child: Text('Hello, world!'),
),
floatingActionButton: const FloatingActionButton(
tooltip: 'Add', // used by assistive technologies
onPressed: null,
child: Icon(Icons.add),
),
);
}
}<code_end>
Now that the code has switched from MyAppBar and MyScaffold to the
AppBar and Scaffold widgets, and from material.dart,
the app is starting to look a bit more Material.
For example, the app bar has a shadow and the title text inherits the
correct styling automatically. A floating action button is also added.Notice that widgets are passed as arguments to other widgets.
The Scaffold widget takes a number of different widgets as
named arguments, each of which are placed in the Scaffold
layout in the appropriate place. Similarly, the
AppBar widget lets you pass in widgets for the
leading widget, and the actions of the title widget.
This pattern recurs throughout the framework and is something you
might consider when designing your own widgets.For more information, check out Material Components widgets.info Note
Material is one of the 2 bundled designs included with Flutter.
To create an iOS-centric design,
check out the Cupertino components package,
which has its own versions of
CupertinoApp, and CupertinoNavigationBar.<topic_end>
<topic_start>
Handling gestures
Most applications include some form of user interaction with the system.
The first step in building an interactive application is to detect
input gestures. See how that works by creating a simple button:
<code_start>import 'package:flutter/material.dart';
class MyButton extends StatelessWidget {
const MyButton({super.key});
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
print('MyButton was tapped!');
},
child: Container(
height: 50,
padding: const EdgeInsets.all(8),
margin: const EdgeInsets.symmetric(horizontal: 8),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5),
color: Colors.lightGreen[500],
),
child: const Center(
child: Text('Engage'),
),
),
);
}
}
void main() {
runApp(
const MaterialApp(
home: Scaffold(