scrollable_list_tab_scroller

Customizable Flutter widget that synchronizes a scrollable list of grouped items with tabs.

Create custom tabs that synchronize with inner ScrollView. The tabs follow the index of scroll view and vice-versa.

Demo

Installation

Add dependency for package on your pubspec.yaml:

dependencies:
    scrollable_list_tab_scroller: <latest>

Usage

To use this widget we must first define how our tabs will look like.

ScrollableListTabScroller

Parameter	Definition
`int itemCount`	Quantity item that will be built.
`IndexedWidgetBuilder itemBuilder`	Builder of list item.
`IndexedActiveStatusWidgetBuilder tabBuilder`	Builder of tab with active status for customization.
`HeaderContainerBuilder? headerContainerBuilder`	Optional header container builder for customization.
`BodyContainerBuilder? bodyContainerBuilder`	Optional body container builder for customization.
`ItemScrollController? itemScrollController`	Optional controller for item list.
`ItemPositionsListener? itemPositionsListener`	Optional listener of item list positions.
`void Function(int)? tabChanged`	Optional listener of tab changes.
`double earlyChangePositionOffset`	Optional vertical offset to change the index before the list item reaches the edge(default = 0).
`Duration animationDuration`	Optional animation duration
`rest of the parameters`	Optional scrollable_positioned_list's parameters

Example

import 'package:flutter/material.dart';
import 'package:scrollable_list_tab_scroller/scrollable_list_tab_scroller.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Scrollable List Tab Scroller',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Scrollable List Tab Scroller'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final data = {
    "Category A": [
      "Item 1 (A)",
      "Item 2 (A)",
      "Item 3 (A)",
      "Item 4 (A)",
    ],
    "Category B": [
      "Item 1 (B)",
      "Item 2 (B)",
    ],
    "Category C": [
      "Item 1 (C)",
      "Item 2 (C)",
      "Item 3 (C)",
      "Item 4 (C)",
      "Item 5 (C)",
    ],
    "Category D": [
      "Item 1 (D)",
      "Item 2 (D)",
      "Item 3 (D)",
      "Item 4 (D)",
      "Item 5 (D)",
      "Item 6 (D)",
      "Item 7 (D)",
      "Item 8 (D)",
      "Item 9 (D)",
    ],
  };

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: ScrollableListTabScroller(
        itemCount: data.length,
        tabBuilder: (BuildContext context, int index, bool active) => Padding(
          padding: EdgeInsets.symmetric(horizontal: 10),
          child: Text(
            data.keys.elementAt(index),
            style: !active
                ? null
                : TextStyle(fontWeight: FontWeight.bold, color: Colors.green),
          ),
        ),
        itemBuilder: (BuildContext context, int index) => Column(
          children: [
            Text(
              data.keys.elementAt(index),
              style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20),
            ),
            ...data.values
                .elementAt(index)
                .asMap()
                .map(
                  (index, value) => MapEntry(
                    index,
                    ListTile(
                      leading: Container(
                        height: 40,
                        width: 40,
                        decoration: BoxDecoration(
                            shape: BoxShape.circle, color: Colors.grey),
                        alignment: Alignment.center,
                        child: Text(index.toString()),
                      ),
                      title: Text(value),
                    ),
                  ),
                )
                .values
          ],
        ),
      ),
    );
  }
}

Considerations

This widget is inspired in scrollable_list_tabview.

License

This project is licensed under the MIT license, additional knowledge about the license can be found here.