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ExtendableDropdown
A Versatile Flutter Package for Dynamic, Generic Dropdown Menus (v1.0.4)
Introducing ExtendableDropdown, a production-ready Flutter package that empowers you to create dynamic and expandable multiple dropdown menus with full support for generic data types.
🚀 Key Features
- Generic Type Support: Handle any data type (
T) with full type safety. No longer restricted to strings!
- Dynamic Slot Management: Add or remove dropdown slots on the fly with a simple, intuitive UI.
- Dismissible Interaction: Swipe-to-dismiss functionality for removing selections with item return logic.
labelBuilder API: Complete control over how your custom objects are rendered as text in the dropdown.- Configurable UI Fragments: Pass your own Widgets for the Add Button and custom callbacks for message handling.
- Fully Mutable-Safe: Built with immutability in mind, following Flutter's best practices for widget design.
📦 Installation
Add extendable_dropdown as a dependency in your pubspec.yaml file:
dependencies:
extendable_dropdown: ^1.0.4
Import the package in your Flutter code:
import 'package:extendable_dropdown/extendable_dropdown.dart';
🛠 Usage
Simple Usage (Strings)
List<String> cities = ['Colombo', 'Kandy', 'Galle', 'Jaffna'];
ExtendableDropdown<String>(
list: cities,
onSendListChanged: (selectedItems) {
print('Selected cities: $selectedItems');
},
)
Advanced Usage (Custom Objects & UI)
You can use any custom model and fully override the UI.
ExtendableDropdown<Location>(
list: myLocationList,
onSendListChanged: (selected) => print(selected),
labelBuilder: (location) => location.name,
addButton: ElevatedButton.icon(
onPressed: null,
icon: Icon(Icons.add),
label: Text("Add Location"),
),
onMessage: (context, message) {
MyCustomToast.show(message);
},
)
🎨 Professional Customization
ExtendableDropdown comes with a wide range of styling options:
| Property |
Description |
Default |
list |
The initial list of items to choose from. |
Required |
onSendListChanged |
Callback triggered when the selection changes. |
Required |
labelBuilder |
Function to map generic items to strings. |
item.toString() |
addButton |
Widget: Custom widget for the add button. |
Styled default button |
onMessage |
Callback: Handle custom alerts/notifications. |
Default SnackBar |
dismissibleBackgroundColor |
Color shown when swiping to delete. |
Colors.red |
selectedIcon |
Icon shown for a selected slot. |
Icons.radio_button_checked |
nonSelectedIcon |
Icon shown for an empty slot. |
Icons.location_on_outlined |
dropdownBorderRadius |
Border radius of the dropdown container. |
10.0 |
Check out the [example](file:///Users/mymac/Documents/MyProjects/extendable_dropdown/example/lib/main.dart) folder for a full implementation!
🚧 Roadmap
- [x] Generic data type support (Completed)
- [x] Improved state management and immutability (Completed)
- [ ] Searchable dropdown options
- [ ] Multi-select within a single dropdown slot
- [ ] Custom animation support for slot addition
🤝 Contributing
We welcome your feedback and contributions! Please feel free to open issues or submit pull requests.
📄 License
This project is licensed under the MIT License - see the [LICENSE](file:///Users/mymac/Documents/MyProjects/extendable_dropdown/LICENSE) file for details.
Made with ❤️ by Chanuka Ranathunga
