fade

Description:

fade

fade #

A Widget that animates its visible property with fade and size (height) transitions made on child widget. It allows declarative UI without code smell like animation controller for each widget that should fade away. The Widget works on bounded and unbounded constraints, so height doesn't need to be explicitly provided to the child widget.
The library provides one widget Fade and depends only on Flutter framework.
Example #

Simple example with containers - Simple example with a few containers in a tappable column.

Usage #
Let's see a basic demo:
class MyPage extends StatefulWidget {
@override
_MyPageState createState() => _MyPageState();
}

class _MyPageState_ extends State<MyPage> {
bool visible = false;

@override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: GestureDetector(
onTap: () => setState(() => visible = !visible),
child: Column(
children: <Widget>[
Container(
height: 200,
color: Colors.blue,
),
Fade(
visible: visible,
// duration is optional
duration: Duration(milliseconds: 400),
child: Container(
height: 200,
color: Colors.green,
),
),
Container(
height: 200,
color: Colors.red,
),
],
),
),
),
);
}
}
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Contributors #

Mateusz Wojtczak