full_width_dropdown_button #

A polished, animated full-width dropdown for Flutter with nested submenus, smart overlay positioning, rich leading widgets, hover feedback, and a thread-style connector for child actions.

Screenshot #

Features #

• Full-width overlay menu with configurable trigger width/height
• Opens below first and flips above only when there is not enough space
• Menu stays attached to the trigger while the page scrolls
• Flat string API and rich nested-item API
• Nested animated submenus
• Widget leading content for icons, SVGs, avatars, etc.
• Destructive parent and sub-items
• Mouse hover states for desktop/web
• Haptic feedback on supported platforms
• Custom trigger widget or SVG asset trigger
• Smooth scale, fade, slide, and expansion animations

Installation #

dependencies:
  full_width_dropdown_button: ^0.1.1

Then import:

import 'package:full_width_dropdown_button/full_width_dropdown_button.dart';

Simple usage #

FullWidthDropdownButton(
  child: const Icon(Icons.tune_rounded),
  items: const ['Newest', 'Oldest', 'Popular'],
  onSelected: (value) {
    debugPrint(value);
  },
)

Rich nested usage #

FullWidthDropdownButton.rich(
  child: const Icon(Icons.filter_alt_rounded),
  dropdownItems: [
    const DropdownItem(
      label: 'Food type',
      leading: Icon(Icons.restaurant_rounded, size: 16),
      subItems: ['Soup', 'Grill', 'Stir-fry'],
    ),
    const DropdownItem(
      label: 'Meat',
      leading: Icon(Icons.lunch_dining_rounded, size: 16),
      subItems: [
        DropdownSubItem(label: 'Beef'),
        DropdownSubItem(label: 'Chicken'),
        DropdownSubItem(label: 'Remove filter', isDestructible: true),
      ],
    ),
    const DropdownItem(label: 'Popular'),
    const DropdownItem(
      label: 'Clear all',
      isDestructible: true,
      leading: Icon(Icons.delete_outline_rounded, size: 16),
    ),
  ],
  onItemSelected: (parent, sub) {
    debugPrint(sub == null ? parent : '$parent > $sub');
  },
)

SVG trigger #

If you prefer an asset path instead of a custom trigger widget:

FullWidthDropdownButton(
  iconAsset: 'assets/filter.svg',
  items: const ['A', 'B', 'C'],
  onSelected: debugPrint,
)

Remember to register the asset in your app's pubspec.yaml.

Styling the trigger #

FullWidthDropdownButton.rich(
  width: 52,
  height: 52,
  padding: const EdgeInsets.all(14),
  decoration: BoxDecoration(
    color: Colors.grey.shade100,
    borderRadius: BorderRadius.circular(100),
  ),
  openDecoration: BoxDecoration(
    color: Colors.black,
    borderRadius: BorderRadius.circular(100),
  ),
  iconColor: Colors.grey,
  openIconColor: Colors.white,
  child: const Icon(Icons.menu_rounded),
  dropdownItems: const [DropdownItem(label: 'Option')],
  onItemSelected: (parent, sub) {},
)

Notes #

The menu width uses the current screen width with a 16 px horizontal margin. The initial placement calculation intentionally uses the collapsed parent-row height. This keeps the dropdown down-first instead of flipping upward merely because a submenu could later expand.

License #

MIT