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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.

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

If you don't want to build your own HeaderContainer with a builder, you can instead use the ScrollableListTabScroller.defaultComponents() constructor, which provides additional properties for customizing the default header container and tab bar.

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
          ],
        ),
      ),
    );
  }
}

License

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