Flutter Dropdown Button

A highly customizable dropdown package for Flutter with overlay-based rendering, smooth animations, and full control over appearance and behavior — all in a single widget.

Features

Single Unified Widget: One FlutterDropdownButton<T> for all use cases
Two Modes: Custom widget rendering (default) or text-only (.text())
Overlay-based Rendering: Better positioning and visual effects than Flutter's built-in DropdownButton
Smart Positioning: Automatically opens up/down based on available space
Smooth Animations: Scale and fade effects with configurable timing
Outside-tap Dismissal: Automatic closure when tapping outside
Flexible Width: Fixed, min/max constraints, content-based, or flex expansion
Independent Menu Width: Set menu width separately from button with alignment control
Text Overflow Control: Ellipsis, fade, clip, or visible overflow options
Smart Tooltip: Automatic tooltip on overflow with full customization
Custom Scrollbar: Scrollbar theming with colors, thickness, and visibility
Single-Item Mode: Auto-disable when only one option exists
Leading Widgets: Optional icons/widgets before text content

Screenshots


Basic Text Dropdown Simple text options with customizable styles	Icon + Text Dropdown Rich content with icons and hover effects

Quick Start

Add to your pubspec.yaml:

dependencies:
  flutter_dropdown_button: ^2.0.0

Import the package:

import 'package:flutter_dropdown_button/flutter_dropdown_button.dart';

Basic Usage

Text Dropdown (Fixed Width)

FlutterDropdownButton<String>.text(
  items: ['Apple', 'Banana', 'Cherry'],
  value: selectedValue,
  hint: 'Select a fruit',
  width: 200,
  onChanged: (value) {
    setState(() => selectedValue = value);
  },
)

Text Dropdown (Dynamic Width)

FlutterDropdownButton<String>.text(
  items: ['Apple', 'Banana', 'Cherry'],
  value: selectedValue,
  hint: 'Select a fruit',
  minWidth: 120,
  maxWidth: 300,
  onChanged: (value) {
    setState(() => selectedValue = value);
  },
)

Custom Widget Dropdown

FlutterDropdownButton<String>(
  items: ['home', 'settings', 'profile'],
  value: selectedValue,
  hintWidget: Text('Choose option'),
  itemBuilder: (item, isSelected) => Row(
    children: [
      Icon(_getIcon(item), size: 20),
      SizedBox(width: 8),
      Text(item),
    ],
  ),
  onChanged: (value) {
    setState(() => selectedValue = value);
  },
)

Custom Selected Display

FlutterDropdownButton<String>(
  items: ['apple', 'banana'],
  value: selectedValue,
  itemBuilder: (item, isSelected) => Text(item),
  selectedBuilder: (item) => Text(item.toUpperCase(),
    style: TextStyle(fontWeight: FontWeight.bold),
  ),
  onChanged: (value) {
    setState(() => selectedValue = value);
  },
)

API Reference

FlutterDropdownButton<T>

The unified dropdown widget. Use the default constructor for custom widget rendering, or .text() for text-only content.

Custom Mode (Default Constructor)

Parameter	Type	Default	Description
`items`	`List<T>`	required	List of item values
`onChanged`	`ValueChanged<T?>`	required	Called when an item is selected
`itemBuilder`	`Widget Function(T, bool)`	required	Builds widget for each item (`item`, `isSelected`)
`selectedBuilder`	`Widget Function(T)?`	`null`	Builds widget for selected item on button face (falls back to `itemBuilder`)
`hintWidget`	`Widget?`	`null`	Widget shown when no item is selected

Text Mode (.text Constructor)

Parameter	Type	Default	Description
`items`	`List<T>`	required	List of string items
`onChanged`	`ValueChanged<T?>`	required	Called when an item is selected
`hint`	`String?`	`null`	Text shown when no item is selected
`config`	`TextDropdownConfig?`	`null`	Text rendering configuration
`leading`	`Widget?`	`null`	Widget before text in all items
`selectedLeading`	`Widget?`	`null`	Widget before text in selected item (falls back to `leading`)
`leadingPadding`	`EdgeInsets?`	`right: 8.0`	Padding around the leading widget

Common Parameters (Both Modes)

Parameter	Type	Default	Description
`value`	`T?`	`null`	Currently selected value
`width`	`double?`	`null`	Fixed width (`null` = content-based)
`minWidth`	`double?`	`null`	Minimum width constraint
`maxWidth`	`double?`	`null`	Maximum width constraint
`height`	`double`	`200.0`	Maximum height of dropdown overlay
`itemHeight`	`double`	`48.0`	Height of each dropdown item
`animationDuration`	`Duration`	`200ms`	Duration of show/hide animation
`enabled`	`bool`	`true`	Whether the dropdown is interactive
`expand`	`bool`	`false`	Expand to fill available space in flex container
`trailing`	`Widget?`	`null`	Custom widget replacing default arrow icon
`scrollToSelectedItem`	`bool`	`true`	Auto-scroll to selected item on open
`scrollToSelectedDuration`	`Duration?`	`null`	Scroll animation duration (`null` = instant jump)
`disableWhenSingleItem`	`bool`	`false`	Disable dropdown when only one item exists
`hideIconWhenSingleItem`	`bool`	`true`	Hide arrow icon in single-item mode
`minMenuWidth`	`double?`	`null`	Minimum width of dropdown menu
`maxMenuWidth`	`double?`	`null`	Maximum width of dropdown menu
`menuAlignment`	`MenuAlignment`	`.left`	Menu alignment when wider than button
`theme`	`DropdownStyleTheme?`	`null`	Theme configuration

MenuAlignment

Alignment of the dropdown menu relative to the button when the menu is wider.

Value	Description
`MenuAlignment.left`	Left edges align, menu extends right (default)
`MenuAlignment.center`	Menu centered over button
`MenuAlignment.right`	Right edges align, menu extends left

Theme System

Theme is applied via the theme parameter using DropdownStyleTheme, which groups three theme objects:

DropdownStyleTheme(
  dropdown: DropdownTheme(...),   // General dropdown styling
  scroll: DropdownScrollTheme(...), // Scrollbar styling
  tooltip: DropdownTooltipTheme(...), // Tooltip styling
)

DropdownTheme

Controls general styling for button, overlay, and items.

Button Styling

Parameter	Type	Default	Description
`buttonDecoration`	`BoxDecoration?`	`null`	Custom button decoration (overrides all below)
`buttonPadding`	`EdgeInsets`	`horizontal: 16, vertical: 12`	Internal padding of button
`buttonHeight`	`double?`	`null`	Height of button content area (falls back to `iconSize` or `24.0`)
`buttonHoverColor`	`Color?`	`null`	Button hover background color
`buttonSplashColor`	`Color?`	`null`	Button tap ripple color
`buttonHighlightColor`	`Color?`	`null`	Button focus highlight color

Overlay Styling

Parameter	Type	Default	Description
`overlayDecoration`	`BoxDecoration?`	`null`	Custom overlay decoration (overrides `backgroundColor`, `border`, `borderRadius`)
`overlayPadding`	`EdgeInsets?`	`null`	Padding inside the overlay container
`borderRadius`	`double`	`8.0`	Border radius for button and overlay
`elevation`	`double`	`8.0`	Shadow depth of overlay
`backgroundColor`	`Color?`	`null`	Overlay background color (falls back to `Theme.cardColor`)
`border`	`Border?`	`null`	Border for button and overlay (falls back to `Theme.dividerColor`)
`shadowColor`	`Color?`	`null`	Overlay shadow color

Item Styling

Parameter	Type	Default	Description
`itemPadding`	`EdgeInsets`	`horizontal: 16, vertical: 12`	Internal padding of each item
`itemMargin`	`EdgeInsets?`	`null`	External margin around each item
`itemBorderRadius`	`double?`	`null`	Border radius for individual items
`itemBorder`	`Border?`	`null`	Border for each item (e.g., bottom divider)
`excludeLastItemBorder`	`bool`	`true`	Skip `itemBorder` on the last item
`selectedItemColor`	`Color?`	`null`	Background color for selected item (falls back to `primaryColor` 10%)
`itemHoverColor`	`Color?`	`null`	Item hover background color
`itemSplashColor`	`Color?`	`null`	Item tap ripple color
`itemHighlightColor`	`Color?`	`null`	Item focus highlight color

Icon Styling

Parameter	Type	Default	Description
`icon`	`IconData?`	`Icons.keyboard_arrow_down`	Dropdown arrow icon
`iconSize`	`double?`	`24.0`	Size of the dropdown icon
`iconColor`	`Color?`	`null`	Icon color when enabled
`iconDisabledColor`	`Color?`	`null`	Icon color when disabled
`iconPadding`	`EdgeInsets?`	`EdgeInsets.only(left: 8.0)`	Padding around the icon

DropdownScrollTheme

Controls scrollbar appearance inside the dropdown overlay.

Parameter	Type	Default	Description
`thumbWidth`	`double?`	`null`	Width of the scrollbar thumb
`trackWidth`	`double?`	`null`	Width of the scrollbar track
`radius`	`Radius?`	`null`	Corner radius of scrollbar thumb
`thumbColor`	`Color?`	`null`	Color of the scrollbar thumb
`trackColor`	`Color?`	`null`	Color of the scrollbar track
`trackBorderColor`	`Color?`	`null`	Border color of the scrollbar track
`thumbVisibility`	`bool?`	`null`	Show/hide scrollbar thumb
`trackVisibility`	`bool?`	`null`	Show/hide scrollbar track
`interactive`	`bool?`	`null`	Allow dragging the scrollbar thumb
`crossAxisMargin`	`double?`	`null`	Margin from edge of scroll view
`mainAxisMargin`	`double?`	`null`	Margin at top/bottom of scrollbar
`minThumbLength`	`double?`	`null`	Minimum length of scrollbar thumb
`showScrollGradient`	`bool?`	`false`	Show fade gradient when scrollable
`gradientHeight`	`double?`	`24.0`	Height of gradient effect
`gradientColors`	`List<Color>?`	`null`	Custom gradient colors (auto-detects from background if `null`)

DropdownTooltipTheme

Controls tooltip styling and behavior for text-based dropdowns.

Visual Styling

Parameter	Type	Default	Description
`decoration`	`Decoration?`	`null`	Custom tooltip decoration
`backgroundColor`	`Color?`	`null`	Tooltip background color
`textColor`	`Color?`	`null`	Tooltip text color
`textStyle`	`TextStyle?`	`null`	Tooltip text style (overrides `textColor`)
`borderRadius`	`BorderRadius?`	`null`	Tooltip corner radius
`borderColor`	`Color?`	`null`	Tooltip border color
`borderWidth`	`double?`	`1.0`	Tooltip border width
`shadow`	`List<BoxShadow>?`	`null`	Tooltip shadow
`padding`	`EdgeInsetsGeometry?`	`null`	Padding inside tooltip
`margin`	`EdgeInsetsGeometry?`	`null`	Margin around tooltip

Behavior

Parameter	Type	Default	Description
`enabled`	`bool`	`true`	Enable/disable tooltip
`mode`	`TooltipMode`	`.onlyWhenOverflow`	When to show tooltip
`waitDuration`	`Duration`	`500ms`	Delay before showing on hover
`showDuration`	`Duration`	`3s`	How long tooltip stays visible
`verticalOffset`	`double?`	`null`	Gap between widget and tooltip
`triggerMode`	`TooltipTriggerMode?`	`null`	How tooltip is triggered

TextDropdownConfig

Configuration for text rendering in .text() mode.

Parameter	Type	Default	Description
`overflow`	`TextOverflow`	`.ellipsis`	How to handle text overflow
`maxLines`	`int?`	`1`	Maximum number of lines
`textStyle`	`TextStyle?`	`null`	Style for item text
`hintStyle`	`TextStyle?`	`null`	Style for hint text
`selectedTextStyle`	`TextStyle?`	`null`	Style for selected item text
`textAlign`	`TextAlign`	`.start`	Horizontal text alignment
`softWrap`	`bool`	`true`	Allow line breaks at word boundaries

Advanced Features

Custom Theme

FlutterDropdownButton<String>.text(
  items: items,
  value: selected,
  width: 200,
  theme: DropdownStyleTheme(
    dropdown: DropdownTheme(
      borderRadius: 12.0,
      elevation: 4.0,
      backgroundColor: Colors.white,
      selectedItemColor: Colors.blue.withOpacity(0.1),
      itemHoverColor: Colors.grey.withOpacity(0.1),
      itemBorder: Border(bottom: BorderSide(color: Colors.grey.shade300)),
      excludeLastItemBorder: true,
    ),
    scroll: DropdownScrollTheme(
      thumbWidth: 6.0,
      thumbColor: Colors.blue,
      showScrollGradient: true,
    ),
    tooltip: DropdownTooltipTheme(
      backgroundColor: Colors.black87,
      textStyle: TextStyle(color: Colors.white),
      borderRadius: BorderRadius.circular(8),
      mode: TooltipMode.onlyWhenOverflow,
    ),
  ),
  onChanged: (value) => setState(() => selected = value),
)

Menu Width & Alignment

FlutterDropdownButton<String>.text(
  items: items,
  width: 120,
  minMenuWidth: 250,
  maxMenuWidth: 400,
  menuAlignment: MenuAlignment.center,
  onChanged: (value) {},
)

Single-Item Mode

FlutterDropdownButton<String>.text(
  items: ['Only Option'],
  disableWhenSingleItem: true,
  hideIconWhenSingleItem: true,
  onChanged: (value) {},
)

Leading Widget

FlutterDropdownButton<String>.text(
  items: ['USD', 'EUR', 'JPY'],
  leading: Icon(Icons.attach_money, size: 20),
  selectedLeading: Icon(Icons.attach_money, size: 20, color: Colors.blue),
  leadingPadding: EdgeInsets.only(right: 12),
  onChanged: (value) {},
)

Expand in Flex Container

Row(
  children: [
    Text('Label:'),
    FlutterDropdownButton<String>.text(
      items: items,
      expand: true,
      maxWidth: 200,
      onChanged: (value) {},
    ),
  ],
)

Manual Dropdown Cleanup

void navigateToHome() {
  FlutterDropdownButton.closeAll();
  Navigator.pushNamedAndRemoveUntil(context, '/home', (route) => false);
}

Note: Dropdowns are automatically cleaned up during widget disposal. Use closeAll() only when you need explicit control.

Migration from 1.x

BasicDropdownButton → FlutterDropdownButton

// Before (1.x)
BasicDropdownButton<String>(
  items: [
    DropdownItem(value: 'apple', child: Text('Apple'), onTap: () {}),
    DropdownItem(value: 'banana', child: Text('Banana')),
  ],
  value: selected,
  hint: Text('Select'),
  onChanged: (v) {},
)

// After (2.0)
FlutterDropdownButton<String>(
  items: ['apple', 'banana'],
  value: selected,
  hintWidget: Text('Select'),
  itemBuilder: (item, isSelected) => Text(item),
  onChanged: (v) {},
)

TextOnlyDropdownButton → FlutterDropdownButton.text

// Before (1.x)
TextOnlyDropdownButton(
  items: ['A', 'B', 'C'],
  value: selected,
  hint: 'Select',
  width: 200,
  onChanged: (v) {},
)

// After (2.0)
FlutterDropdownButton<String>.text(
  items: ['A', 'B', 'C'],
  value: selected,
  hint: 'Select',
  width: 200,
  onChanged: (v) {},
)

DynamicTextBaseDropdownButton → FlutterDropdownButton.text

// Before (1.x)
DynamicTextBaseDropdownButton(
  items: items,
  value: selected,
  disableWhenSingleItem: true,
  leading: Icon(Icons.star),
  onChanged: (v) {},
)

// After (2.0)
FlutterDropdownButton<String>.text(
  items: items,
  value: selected,
  disableWhenSingleItem: true,
  leading: Icon(Icons.star),
  onChanged: (v) {},
)

Removed APIs

Removed	Replacement
`DropdownItem<T>`	`itemBuilder` callback
`showSeparator` / `separator`	`DropdownTheme.itemBorder`
`BasicDropdownButton.borderRadius`	`DropdownTheme.borderRadius`
`BasicDropdownButton.decoration`	`DropdownTheme.overlayDecoration`
`DropdownItem.onTap`	Handle in `onChanged` callback

Example

Check out the example app for a comprehensive demonstration of all features and customization options.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Changelog

See CHANGELOG.md for a detailed list of changes and version history.

Name		Name	Last commit message	Last commit date
Latest commit History 82 Commits
documentation		documentation
example		example
lib		lib
screenshot		screenshot
test		test
.gitattributes		.gitattributes
.gitignore		.gitignore
.metadata		.metadata
CHANGELOG.md		CHANGELOG.md
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
analysis_options.yaml		analysis_options.yaml
pubspec.yaml		pubspec.yaml
todo.md		todo.md

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Flutter Dropdown Button

Features

Screenshots

Quick Start

Basic Usage

Text Dropdown (Fixed Width)

Text Dropdown (Dynamic Width)

Custom Widget Dropdown

Custom Selected Display

API Reference

FlutterDropdownButton<T>

Custom Mode (Default Constructor)

Text Mode (.text Constructor)

Common Parameters (Both Modes)

MenuAlignment

Theme System

DropdownTheme

Button Styling

Overlay Styling

Item Styling

Icon Styling

DropdownScrollTheme

DropdownTooltipTheme

Visual Styling

Behavior

TextDropdownConfig

Advanced Features

Custom Theme

Menu Width & Alignment

Single-Item Mode

Leading Widget

Expand in Flex Container

Manual Dropdown Cleanup

Migration from 1.x

BasicDropdownButton → FlutterDropdownButton

TextOnlyDropdownButton → FlutterDropdownButton.text

DynamicTextBaseDropdownButton → FlutterDropdownButton.text

Removed APIs

Example

License

Changelog

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