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flutter_docs

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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>