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Flutter_Documentation

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<topic_end>
<topic_start>
How do I use Icons and Colors?
React Native doesn’t include support for icons
so third party libraries are used.In Flutter, importing the Material library also pulls in the
rich set of Material icons and colors.
<code_start>return const Icon(Icons.lightbulb_outline, color: Colors.redAccent);<code_end>
When using the Icons class,
make sure to set uses-material-design: true in
the project’s pubspec.yaml file.
This ensures that the MaterialIcons font,
which displays the icons, is included in your app.
In general, if you intend to use the Material library,
you should include this line.Flutter’s Cupertino (iOS-style) package provides high
fidelity widgets for the current iOS design language.
To use the CupertinoIcons font,
add a dependency for cupertino_icons in your project’s
pubspec.yaml file.To globally customize the colors and styles of components,
use ThemeData to specify default colors
for various aspects of the theme.
Set the theme property in MaterialApp to the ThemeData object.
The Colors class provides colors
from the Material Design color palette.The following example sets the color scheme from seed to deepPurple
and the text selection to red.
<code_start>class SampleApp extends StatelessWidget {
const SampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Sample App',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
textSelectionTheme:
const TextSelectionThemeData(selectionColor: Colors.red)),
home: const SampleAppPage(),
);
}
}<code_end>
<topic_end>
<topic_start>
How do I add style themes?
In React Native, common themes are defined for
components in stylesheets and then used in components.In Flutter, create uniform styling for almost everything
by defining the styling in the ThemeData
class and passing it to the theme property in the
MaterialApp widget.
<code_start>@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
primaryColor: Colors.cyan,
brightness: Brightness.dark,
),
home: const StylingPage(),
);
}<code_end>
A Theme can be applied even without using the MaterialApp widget.
The Theme widget takes a ThemeData in its data parameter
and applies the ThemeData to all of its children widgets.
<code_start>@override
Widget build(BuildContext context) {
return Theme(
data: ThemeData(
primaryColor: Colors.cyan,
brightness: brightness,
),
child: Scaffold(
backgroundColor: Theme.of(context).primaryColor,
//...
),
);
}<code_end>
<topic_end>
<topic_start>
State management
State is information that can be read synchronously
when a widget is built or information
that might change during the lifetime of a widget.
To manage app state in Flutter,
use a StatefulWidget paired with a State object.For more information on ways to approach managing state in Flutter,
see State management.<topic_end>
<topic_start>
The StatelessWidget
A StatelessWidget in Flutter is a widget
that doesn’t require a state change—
it has no internal state to manage.Stateless widgets are useful when the part of the user interface
you are describing does not depend on anything other than the
configuration information in the object itself and the
BuildContext in which the widget is inflated.AboutDialog, CircleAvatar, and Text are examples
of stateless widgets that subclass StatelessWidget.
<code_start>import 'package:flutter/material.dart';
void main() => runApp(
const MyStatelessWidget(
text: 'StatelessWidget Example to show immutable data',
),
);
class MyStatelessWidget extends StatelessWidget {
const MyStatelessWidget({