universal_dropdown 1.0.5

A highly customizable and generic dropdown widget for Flutter supporting single/multi selection, search, and custom item widgets.

Got it ✅ Here’s a README.md styled like your example, but adapted for your current UniversalDropdown<T> implementation with all the real parameters and proper examples.

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# 🔽 Universal Dropdown

[![Pub Version](https://img.shields.io/pub/v/universal_dropdown)](https://pub.dev/packages/universal_dropdown)
[![License: MIT](https://img.shields.io/badge/license-MIT-purple.svg)](https://opensource.org/licenses/MIT)

A **highly customizable**, **type-safe**, and **feature-rich dropdown widget** for Flutter.  
Works with **any data model**, supports **single/multi-select**, **search**, **pagination**, **custom chips**, and multiple display modes (**overlay** or **bottom sheet**).

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## ✨ Key Features

- ✅ Works with **any data model** (`String`, `Map`, custom class, etc.)
- 🎯 Supports **single** or **multi-select**
- 🔍 **Searchable** dropdown support
- 📜 **Pagination** with async data fetching
- 🖌️ Fully customizable **style and layout**
- 🏷️ Customizable **selected item chips**
- 📱 Two modes: **Overlay** or **Bottom Sheet**

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## 🔧 Installation

Add the latest version to your `pubspec.yaml`:

```yaml
dependencies:
  universal_dropdown: ^1.0.4

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💻 Basic Usage

import 'package:flutter/material.dart';
import 'universal_dropdown.dart'; // Import your widget

class MyDropdownExample extends StatefulWidget {
  @override
  State<MyDropdownExample> createState() => _MyDropdownExampleState();
}

class _MyDropdownExampleState extends State<MyDropdownExample> {
  List<String> fruits = ["Apple", "Banana", "Mango", "Orange"];
  List<String> selected = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Universal Dropdown Example")),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: UniversalDropdown<String>(
          items: fruits,
          selectedItems: selected,
          itemLabel: (item) => item,
          onChanged: (selectedItems) {
            setState(() => selected = selectedItems);
          },
          searchable: true,
          searchPlaceholder: "Search fruits...",
          multiSelect: false,
        ),
      ),
    );
  }
}

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🧩 Usage with Custom Model

class Country {
  final String code;
  final String name;
  Country(this.code, this.name);
}

final countries = [
  Country('US', 'United States'),
  Country('IN', 'India'),
  Country('JP', 'Japan'),
];

UniversalDropdown<Country>(
  items: countries,
  selectedItems: [],
  itemLabel: (country) => country.name,
  onChanged: (selected) {
    print("Selected country: ${selected.first.name}");
  },
  searchable: true,
);

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📜 Paginated Dropdown Example

Future<List<String>> fetchItems(int page, int pageSize) async {
  await Future.delayed(const Duration(milliseconds: 500));
  return List.generate(pageSize, (index) => "Item ${page * pageSize + index + 1}");
}

UniversalDropdown<String>(
  fetchItems: fetchItems,
  selectedItems: [],
  itemLabel: (item) => item,
  onChanged: (selected) => print(selected),
  paginate: true,
  pageSize: 10,
  searchable: true,
  multiSelect: true,
);

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🏷️ Multi-Select with Custom Chips

UniversalDropdown<String>(
  items: ["Flutter", "Dart", "React", "NodeJS"],
  selectedItems: [],
  itemLabel: (item) => item,
  onChanged: (selected) => print(selected),
  multiSelect: true,
  chipBuilder: (item, onRemove) => Chip(
    label: Text(item, style: const TextStyle(color: Colors.white)),
    backgroundColor: Colors.blue,
    onDeleted: onRemove,
  ),
);

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⚙️ API Reference

Property	Type	Description
items	List<T>?	Static list of items to show.
fetchItems	Future<List<T>> Function(int page, int pageSize)?	Async function to load paginated data.
selectedItems	List<T>	Currently selected items.
multiSelect	bool	Allows multiple selections if true.
searchable	bool	Shows search bar if true.
searchPlaceholder	String	Placeholder text for search bar.
paginate	bool	Enables pagination with fetchItems.
pageSize	int	Items per page when paginating.
itemLabel	String Function(T)	Returns display label for each item.
onChanged	Function(List<T>)	Callback when selection changes.
mode	DropdownMode	overlay or bottomSheet.
dropdownDecoration	BoxDecoration?	Custom dropdown container styling.
dropdownMaxHeight	double	Max height of dropdown list.
dropdownOffset	Offset	Position adjustment for dropdown.
dropdownAlignment	Alignment	Alignment of dropdown relative to trigger.
chipBuilder	Widget Function(T item, VoidCallback onRemove)?	Custom builder for selected item chips.
chipSpacing	double	Space between chips.
chipWrapAlignment	WrapAlignment	Alignment of chip container.

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📸 Screenshots

Single Select	Multi Select	Pagination
[Single]	[Multi]	[Pagination]

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🎥 Demo GIF

[Demo]

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