list_selection_widget 1.1.1

List selection widget is a Flutter package that provides a highly customizable dropdown list to select options with ease

list_selection_widget

List Selection Widget is a Flutter package that provides a highly customizable dropdown list to select single or multiple options with ease.

Preview

Usage

First, import the package:

import 'package:list_selection_widget/list_selection_widget.dart';

The package provides two main constructors: ListSelectionWidget.single for single selection and ListSelectionWidget.multi for multiple selections.

The generic ListSelectionWidget(...) constructor is deprecated because it can combine single-selection and multi-selection parameters in invalid ways. Use ListSelectionWidget.single(...) or ListSelectionWidget.multi(...) for new code.

Single Selection

ListSelectionWidget<String>.single(
  hintText: 'Select an option',
  listItems: [
    SelectionItem(value: 'flutter', label: 'Flutter'),
    SelectionItem(value: 'react_native', label: 'React Native'),
    SelectionItem(value: 'swift', label: 'Swift'),
  ],
  selectedValue: null,
  onSingleItemSelected: (item) {
    print('Selected: ${item.label}');
  },
  autoCollapsed: true,
  animationDuration: const Duration(milliseconds: 120),
)

Multiple Selection

ListSelectionWidget<String>.multi(
  hintText: 'Select multiple options',
  listItems: [
    SelectionItem(value: 'flutter', label: 'Flutter'),
    SelectionItem(value: 'react_native', label: 'React Native'),
    SelectionItem(value: 'swift', label: 'Swift'),
  ],
  multiSelectValues: [],
  onMultiItemsSelected: (items) {
    print('Selected: ${items.map((item) => item.label).join(', ')}');
  },
)

Customization

The widget offers various customization options:

• decoration: Customize the overall appearance of the widget
• iconStyle: Customize the icons used in the widget
• textStyle: Customize the text styles
• paddingData: Adjust padding for different parts of the widget
• hideLines: Hide separator lines between items
• maxHeight: Set a maximum height for the dropdown list
• autoCollapsed: Collapse the list automatically after an item is selected
• animationDuration: Customize the list expansion and title icon rotation duration
• initiallyExpanded: Show the list opened on first build
• onExpansionChanged: Listen when the list opens or closes
• selectedTitleBuilder: Customize the title text shown when items are selected
• itemBuilder: Customize each item row while keeping the built-in selection behavior
• allowDefaultRotation: Disable the built-in title icon rotation when using a custom animated icon

Migration note: use IconStyleData.trailingIcon for the title icon. The old misspelled tailingIcon parameter was removed.

Customization Precedence

• selectedTitleBuilder replaces the default selected title text. When it is provided, the widget does not use hintText or the comma-separated selected labels for the title.
• itemBuilder replaces the default item row content. When it is provided, iconStyle.selectionCustomIcon, iconStyle.selectedIconColor, iconStyle.unselectedIconColor, iconStyle.backgroundSelectedIconColor, textStyle.itemTextStyle, and textStyle.selectedItemTextStyle no longer affect the item row content.
• itemBuilder does not replace the row wrapper. The package still handles item taps, paddingData.itemPadding, paddingData.itemMargin, and hideLines.
• decoration, paddingData.contentPadding, paddingData.titlePadding, maxHeight, animationDuration, and title icon options still apply when itemBuilder is used.

Custom Title Icon Rotation

By default, the title icon rotates when the list expands or collapses. Set allowDefaultRotation to false when you want to keep your custom trailingIcon static and prevent the package from rotating it.

ListSelectionWidget<String>.single(
  hintText: 'Select an option',
  listItems: [
    SelectionItem(value: 'flutter', label: 'Flutter'),
    SelectionItem(value: 'react_native', label: 'React Native'),
  ],
  selectedValue: null,
  onSingleItemSelected: (item) {
    print('Selected: ${item.label}');
  },
  iconStyle: IconStyleData(
    trailingIcon: const Icon(Icons.more_horiz),
    allowDefaultRotation: false,
  ),
)

Example with customization:

ListSelectionWidget<String>.single(
  hintText: 'Select an option',
  listItems: [
    SelectionItem(value: 'flutter', label: 'Flutter'),
    SelectionItem(value: 'react_native', label: 'React Native'),
    SelectionItem(value: 'swift', label: 'Swift'),
  ],
  selectedValue: null,
  onSingleItemSelected: (item) {
    print('Selected: ${item.label}');
  },
  hideLines: true,
  decoration: BoxDecoration(
    color: Colors.blue,
    borderRadius: BorderRadius.circular(10),
  ),
  iconStyle: IconStyleData(
    collapsedIconColor: Colors.white,
    expandedIconColor: Colors.amber,
  ),
  textStyle: TextStyleData(
    titleStyle: TextStyle(color: Colors.white),
    itemTextStyle: TextStyle(color: Colors.white),
  ),
  maxHeight: 200,
  autoCollapsed: true,
  animationDuration: const Duration(milliseconds: 120),
)

Custom Selected Title

ListSelectionWidget<String>.multi(
  hintText: 'Select options',
  listItems: items,
  multiSelectValues: selectedItems,
  onMultiItemsSelected: (items) {
    setState(() {
      selectedItems = items;
    });
  },
  selectedTitleBuilder: (items) {
    if (items.isEmpty) return 'Select options';
    return '${items.length} selected';
  },
)

Custom Item Row

ListSelectionWidget<String>.single(
  hintText: 'Select an option',
  listItems: items,
  selectedValue: selectedItem,
  onSingleItemSelected: (item) {
    setState(() {
      selectedItem = item;
    });
  },
  itemBuilder: (context, item, isSelected) {
    return Row(
      children: [
        Icon(
          isSelected ? Icons.check_circle : Icons.circle_outlined,
          size: 18,
        ),
        const SizedBox(width: 8),
        Expanded(child: Text(item.label)),
      ],
    );
  },
)

Expansion State

ListSelectionWidget<String>.multi(
  hintText: 'Select options',
  listItems: items,
  multiSelectValues: selectedItems,
  onMultiItemsSelected: (items) {
    setState(() {
      selectedItems = items;
    });
  },
  initiallyExpanded: true,
  onExpansionChanged: (isExpanded) {
    print('Expanded: $isExpanded');
  },
)

Full Example

Here's a complete example demonstrating both single and multiple selection widgets:

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

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'List Selection Widget Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const Demo(title: 'List Selection Widget Demo'),
    );
  }
}

class Demo extends StatefulWidget {
  const Demo({super.key, required this.title});

  final String title;

  @override
  State<Demo> createState() => _DemoState();
}

class _DemoState extends State<Demo> {
  final List<SelectionItem<String>> _listItems = [
    SelectionItem(value: 'flutter', label: 'Flutter'),
    SelectionItem(value: 'react_native', label: 'React Native'),
    SelectionItem(value: 'swift', label: 'Swift'),
    SelectionItem(value: 'kotlin', label: 'Kotlin'),
  ];

  SelectionItem<String>? _selectedItem;
  List<SelectionItem<String>> _multiSelectedItems = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            ListSelectionWidget<String>.single(
              hintText: 'Select an item',
              listItems: _listItems,
              selectedValue: _selectedItem,
              onSingleItemSelected: (item) {
                setState(() {
                  _selectedItem = item;
                });
              },
              hideLines: true,
            ),
            const SizedBox(height: 30),
            ListSelectionWidget<String>.multi(
              hintText: 'Select multiple items',
              listItems: _listItems,
              multiSelectValues: _multiSelectedItems,
              onMultiItemsSelected: (items) {
                setState(() {
                  _multiSelectedItems = items;
                });
              },
            ),
          ],
        ),
      ),
    );
  }
}

This example demonstrates how to use both single and multiple selection widgets in a Flutter app, along with state management to track selected items.

Contributing

Contributions to improve the package are welcome. If you find any issues, please report them so they can be addressed as soon as possible.