anchor_tabs

Description:

anchor tabs

This project is a way to implement a anchor tabs panel like the one of the rhymit.
The idea is that sometimes you have a big list where you can scroll,
but you still want buttons to help the user to navigate to different scroll positions, and also want that the selected button keeps updated as you scroll
Anchor tabs provide a great user experience as it let the user do what they like most: keep scrolling. While providing a way to navigate to specific positions of that scroll.
I made this video explaining how to use this package:
https://www.youtube.com/watch?v=CPql7o1utiM

Features #
Tab button scroll to the block
Scrolling will update the tab button selected
Getting started #
Add the dependency to your pubspec.yaml:
anchor_tabs: ^0.0.9
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Usage #
class SimpleExample extends StatelessWidget {
const SimpleExample({
super.key,
});

@override
Widget build(BuildContext context) {
final DateTime today = DateTime.now();

final List<String> tabsText = [
'Today',
'Yesterday',
];

for (int i = 2; i < 10; i++) {
final DateTime pastDate = today.subtract(Duration(days: i));
tabsText.add('${pastDate.day}/${pastDate.month}');
}

final List<Widget> tabs = [];
final List<Widget> body = [];

for (final element in tabsText) {
// Create a tab item
tabs.add(Text(element));

// Create a target item
body.add(
ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
controller: ScrollController(),
itemCount: 40,
itemBuilder: (BuildContext ctxt, int i) => Text(
'$element $i',
style: Theme.of(ctxt).textTheme.headlineSmall,
),
),
);
}

return Container(
margin: const EdgeInsets.all(10),
child: Column(
children: [
const Text('Simple example of anchor tabs'),
Expanded(
child: AnchorTabPanel(
tabs: tabs,
body: body,
)),
],
),
);
}
}
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Additional information #
This AnchorTabPanel widget have more fields like the one to configure the size of the tab buttons
Like us on pub.dev #
Package url:
https://pub.dev/packages/anchor_tabs
Builder #
For memory management reasons, this package also has an experimental anchor_tab_panel_builder that uses a list view to
build the body elements only when the scroll positions are near them. This is a great way to improve the performance of your app.
Eager to hear feedback on that feature, so if you have some problem with it please create an issue or a pull request
in the github repository.
class TestAnchorTabPanelBuilder extends StatelessWidget {
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(
title: const Text('Anchor Tab Panel Test'),
),
body: AnchorTabPanelBuilder(
tabBuilder: (BuildContext context, int index) {
debugPrint('Tab builder called for index: $index');
return Text('Tab ${index + 1}');
},
bodyBuilder: (BuildContext context, int index) {
debugPrint('Body builder called for index: $index');
return Container(
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
color: index % 2 == 0 ? Colors.orange : Colors.green,
child: Center(
child: Text(
'Body ${index + 1}',
style: const TextStyle(
fontSize: 24,
color: Colors.white,
),
),
),
);
},
itemCount: 100,
animationDuration: const Duration(milliseconds: 1000),
animationCurve: Curves.ease,
tabHeight: 35,
selectedTabHeight: 40,
),
);
}
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Contribute on github #
If you have some problem that this package doesn't solve feel free to contribute on github
https://github.com/ivofernandes/anchor_tabs
Instruction to publish the package to pub.dev #
dart pub publish