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Flutter_Documentation

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duration: const Duration(milliseconds: 3000),
vsync: this,
);
final CurvedAnimation curve = CurvedAnimation(
parent: controller,
curve: Curves.easeIn,
);
animation = Tween(begin: 0.0, end: 1.0).animate(curve);
controller.forward();
}
@override
void dispose() {
controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return FadeTransition(
opacity: animation,
child: const SizedBox(
height: 300,
width: 300,
child: FlutterLogo(),
),
);
}
}<code_end>
<topic_end>
<topic_start>
How do I add swipe animation to cards?
In React Native, either the PanResponder or
third-party libraries are used for swipe animation.In Flutter, to add a swipe animation, use the
Dismissible widget and nest the child widgets.
<code_start>return Dismissible(
key: Key(widget.key.toString()),
onDismissed: (dismissDirection) {
cards.removeLast();
},
child: Container(
//...
),
);<code_end>
<topic_end>
<topic_start>
React Native and Flutter widget equivalent components
The following table lists commonly-used React Native
components mapped to the corresponding Flutter widget
and common widget properties.
<topic_end>
<topic_start>Flutter for web developers
This page is for users who are familiar with the HTML
and CSS syntax for arranging components of an application’s UI.
It maps HTML/CSS code snippets to their Flutter/Dart code equivalents.Flutter is a framework for building cross-platform applications
that uses the Dart programming language.
To understand some differences between programming with Dart
and programming with Javascript,
see Learning Dart as a JavaScript Developer.One of the fundamental differences between
designing a web layout and a Flutter layout,
is learning how constraints work,
and how widgets are sized and positioned.
To learn more, see Understanding constraints.The examples assume:The HTML document starts with <!DOCTYPE html>, and the CSS box model
for all HTML elements is set to border-box,
for consistency with the Flutter model.In Flutter, the default styling of the ‘Lorem ipsum’ text
is defined by the bold24Roboto variable as follows,
to keep the syntax simple:
<code_start>TextStyle bold24Roboto = const TextStyle(
color: Colors.white,
fontSize: 24,
fontWeight: FontWeight.bold,
);<code_end>
How is react-style, or declarative, programming different from the
traditional imperative style?
For a comparison, see Introduction to declarative UI.<topic_end>
<topic_start>
Performing basic layout operations
The following examples show how to perform the most common UI layout tasks.<topic_end>
<topic_start>
Styling and aligning text
Font style, size, and other text attributes that CSS
handles with the font and color properties are individual
properties of a TextStyle child of a Text widget.For text-align property in CSS that is used for aligning text,
there is a textAlign property of a Text widget.In both HTML and Flutter, child elements or widgets
are anchored at the top left, by default.<topic_end>
<topic_start>
Setting background color
In Flutter, you set the background color using the color property
or the decoration property of a Container.
However, you cannot supply both, since it would potentially
result in the decoration drawing over the background color.
The color property should be preferred
when the background is a simple color.
For other cases, such as gradients or images,
use the decoration property.The CSS examples use the hex color equivalents to the Material color palette.<topic_end>
<topic_start>
Centering components
A Center widget centers its child both horizontally
and vertically.To accomplish a similar effect in CSS, the parent element uses either a flex
or table-cell display behavior. The examples on this page show the flex
behavior.<topic_end>
<topic_start>