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Description:

flutter conditional rendering

flutter_conditional_rendering #
A flutter package which enhances conditional rendering, supports if-else and switch conditions.
Why #
In flutter if you want to do conditional rendering, you may do this:
class MyWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
if (someCondition == true)
Text('The condition is true!'),
],
);
}
}
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But what if you want to use a tertiary (if-else) condition?
class MyWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
someCondition == true ?
Text('The condition is true!'):
Text('The condition is false!'),
],
);
}
}
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It is okay for a single Text widget, but the readability quickly become very bad when the child widget is multi-layered.
Usage #
If-Else condition: #
class MyWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Conditional.single(
context: context,
conditionBuilder: (BuildContext context) => someCondition == true,
widgetBuilder: (BuildContext context) => Text('The condition is true!'),
fallbackBuilder: (BuildContext context) => Text('The condition is false!'),
),
],
);
}
}
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Switch condition: #
class MyWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
ConditionalSwitch.single<String>(
context: context,
valueBuilder: (BuildContext context) => 'A',
caseBuilders: {
'A': (BuildContext context) => Text('The value is A!'),
'B': (BuildContext context) => Text('The value is B!'),
},
fallbackBuilder: (BuildContext context) => Text('None of the cases matched!'),
),
],
);
}
}
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Want a list of widgets? #
If you want to conditionally render a list of widgets (List<Widget>) instead of a single one. Use Conditional.list() and ConditionalSwitch.list()!
Contributions #
Feel free to contribute to this project.
If you find a bug or want a feature, but don't know how to fix/implement it, please fill an issue.
If you fixed a bug or implemented a feature, please send a pull request.