flutter_dropdown_button - Dart API docs

A highly customizable dropdown package for Flutter with overlay-based rendering, smooth animations, and full control over appearance and behavior.

Features

Two Widgets: FlutterDropdownButton<T> chooses one item; FlutterMultiSelectDropdown<T> is a checklist that stays open
Two Modes: Custom widget rendering (default) or text-only (.text())
Multi-Select: Tick boxes, get a Set<T> at once — anchored, not modal, and no confirm button
Any Type in Text Mode: Supply a label callback and keep tooltips, overflow handling and search
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
Searchable Dropdown: Real-time filtering with customizable search field
Build Your Own: DropdownOverlayController exposes the overlay machinery, and TextItemPresentation the text rendering

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: ^3.2.0

Import the package:

import 'package:flutter_dropdown_button/flutter_dropdown_button.dart';

Basic Usage

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

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

Pass a label to render any type as text. Overflow handling, the tooltip, and the default search filter all work off the label.

FlutterDropdownButton<User>.text(
  items: users,
  value: selectedUser,
  label: (user) => user.name,
  hint: 'Select a user',
  searchable: true,          // filters by name, no searchFilter needed
  onChanged: (value) {
    setState(() => selectedUser = value);
  },
)

Reach for the default constructor only when an item needs more than text — an avatar, an icon, a two-line layout.

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);
  },
)

Multi-Select Checklist

Ticking a box calls onChanged immediately with a new Set. The menu stays open, so the next box can be ticked. There is no confirm button and no scrim.

FlutterMultiSelectDropdown<String>(
  items: ['Windows', 'Linux', 'macOS'],
  selected: chosen,
  labelBuilder: (s) => switch (s.length) {
    0 => 'All',
    1 => s.first,
    _ => '${s.length} selected',
  },
  searchable: true,                        // when the list runs long
  itemLeadingBuilder: (v) => Icon(osIcon[v]),
  itemTrailingBuilder: (v) => Text('${counts[v]}'),
  onChanged: (next) => setState(() => chosen = next),
)

selected is yours. The widget copies it before emitting, never edits it, and draws whatever you hand it — see A value that is not in items.

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 item values
`onChanged`	`ValueChanged<T?>`	required	Called when an item is selected
`hint`	`String?`	`null`	Text shown when no item is selected
`label`	`String Function(T)?`	`null`	Extracts the text to display for an item. Required unless `T` is `String`
`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. Drawn on the button whether or not it is in `items` — see below
`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
`searchable`	`bool`	`false`	Enable search/filter field in dropdown
`searchFilter`	`bool Function(T, String)?`	`null`	Custom filter function (required for custom mode)
`emptyBuilder`	`Widget Function(String)?`	`null`	Widget builder for empty search results

A value that is not in `items`

A list refresh can drop the row a value names while value still names it. The button keeps drawing that value; the menu, which iterates items, draws no row for it. The widget draws what it was handed — value is yours, and a button that silently reverted to its hint would disagree with the state you hold. Nothing throws.

FlutterMultiSelectDropdown follows the same rule: such a value still counts towards labelBuilder, so '3 selected' can appear beside two ticked rows. Give the user a way to clear it.

FlutterMultiSelectDropdown<T>

A checklist. Several items may be chosen, the menu stays open while they are, and onChanged fires the moment a box is ticked. Anchored rather than modal: no scrim, dismissed by an outside tap.

Rows render as text, so T must be a String or label must say how to make one. T must implement == and hashCode consistently — a Set needs both, where single-select's value == item needed only the first.

Parameter	Type	Default	Description
`items`	`List<T>`	required	List of item values
`selected`	`Set<T>`	required	The chosen items. Yours; never mutated
`onChanged`	`ValueChanged<Set<T>>`	required	Called with a new `Set` the moment a row is tapped
`labelBuilder`	`String Function(Set<T>)`	required	Turns `selected` into the button's face
`label`	`String Function(T)?`	`null`	The text a row shows. Required unless `T` is `String`
`itemLeadingBuilder`	`Widget Function(T)?`	`null`	Drawn between the checkbox and the label — an icon that varies by item
`itemTrailingBuilder`	`Widget Function(T)?`	`null`	Drawn at the end of each row — a count, a badge
`config`	`TextDropdownConfig?`	`null`	Text rendering configuration

Everything under Common Parameters above applies too, except the five that mean nothing to a checklist and therefore do not exist on it: value, scrollToSelectedItem, scrollToSelectedDuration, disableWhenSingleItem and hideIconWhenSingleItem. They are absent from the type rather than asserted against at runtime.

FlutterMultiSelectDropdown.closeAll();   // the same registry as the other widget

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 five theme objects:

DropdownStyleTheme(
  dropdown: DropdownTheme(...),          // General dropdown styling
  scroll: DropdownScrollTheme(...),      // Scrollbar styling
  tooltip: DropdownTooltipTheme(...),    // Tooltip styling
  search: SearchFieldTheme(...),         // Search field styling
  checkbox: DropdownCheckboxTheme(...),  // Multi-select row checkbox styling
)

DropdownTheme

Controls general styling for button, overlay, and items.

The theme fills in its own gaps. resolveButton(), resolveOverlay() and resolveItem() return styles whose slots are all filled, taking a plain DropdownAmbientColors palette rather than a BuildContext — so the rule for "what colour is the arrow when disabled?" lives in one place and can be tested without a widget. You rarely call these directly; the widget does.

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

Disabled State

Applied when enabled: false (or when the single-item auto-disable kicks in). If none of these are set, the disabled button falls back to the regular buttonDecoration / border.

Parameter	Type	Default	Description
`disabledButtonDecoration`	`BoxDecoration?`	`null`	Full custom decoration for the disabled button (takes precedence over the two below)
`disabledBackgroundColor`	`Color?`	`null`	Background color of the button when disabled
`disabledBorder`	`Border?`	`null`	Border of the button when disabled (falls back to `border`)

DropdownScrollTheme

Controls scrollbar appearance inside the dropdown overlay.

Parameter	Type	Default	Description
`thumbWidth`	`double?`	`null`	Width of the scrollbar. Wins over `thickness`
`thickness`	`double?`	`null`	Thickness of the scrollbar. Unset, the ambient `ScrollbarTheme` decides, then Flutter's own default — 8 on desktop, 4 on Android
`radius`	`Radius?`	`null`	Corner radius of scrollbar thumb. Unset, `Radius.circular(8)` on desktop and square on Android
`thumbColor`	`Color?`	`null`	Color of the scrollbar thumb
`trackColor`	`Color?`	`null`	Color of the scrollbar track. Paints nothing unless `trackVisibility` is `true`
`trackBorderColor`	`Color?`	`null`	Border color of the scrollbar track, on the same terms as `trackColor`
`thumbVisibility`	`bool?`	`null`	`true` pins the thumb on screen. `false` and `null` behave alike: it fades in while scrolling and fades out
`trackVisibility`	`bool?`	`null`	`true` draws the track and pins the thumb with it. Unset, there is no track
`interactive`	`bool?`	`null`	`false` makes the thumb undraggable. Unset, Flutter decides — draggable on desktop, not on Android
`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`)

A colour is not a request. trackColor describes the track; trackVisibility is what draws it. A null bool? means let the ambient ScrollbarTheme decide — not off.

DropdownTooltipTheme

Controls tooltip styling and behavior for text-based dropdowns.

Visual Styling

Parameter	Type	Default	Description
`decoration`	`Decoration?`	`null`	Custom tooltip decoration; a total override
`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
`border`	`BoxBorder?`	`null`	Tooltip border
`shadow`	`List<BoxShadow>?`	`null`	Tooltip shadow
`padding`	`EdgeInsetsGeometry?`	`null`	Padding inside tooltip
`margin`	`EdgeInsetsGeometry?`	`null`	Margin around tooltip

Setting any of backgroundColor, borderRadius, border or shadow hands this theme the tooltip's whole box; the ones you leave unset fall back to Flutter's own tooltip defaults. Set none of them and an app-wide TooltipTheme still applies.

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

SearchFieldTheme

Controls the appearance and behavior of the search text field when searchable is enabled.

Layout

Parameter	Type	Default	Description
`height`	`double?`	`36.0`	Height of the search field
`borderRadius`	`BorderRadius?`	`circular(8)`	Corner radius of the search field
`margin`	`EdgeInsets?`	`fromLTRB(8, 8, 8, 4)`	Outer margin around the search field
`padding`	`EdgeInsets?`	`null`	Inner padding of the search field container
`contentPadding`	`EdgeInsets?`	`horizontal: 12, vertical: 8`	Content padding inside the text field

Styling

Parameter	Type	Default	Description
`decoration`	`InputDecoration?`	`null`	Full InputDecoration override (ignores individual properties when set)
`textStyle`	`TextStyle?`	`null`	Text style for search input
`backgroundColor`	`Color?`	`null`	Background color of the search field
`border`	`BoxBorder?`	`null`	Border when not focused
`focusedBorder`	`BoxBorder?`	`null`	Border when focused
`divider`	`Widget?`	`null`	Widget between search field and item list

Cursor

Parameter	Type	Default	Description
`cursorColor`	`Color?`	`null`	Cursor color
`cursorWidth`	`double?`	`2.0`	Cursor width
`cursorHeight`	`double?`	`null`	Cursor height
`cursorRadius`	`Radius?`	`null`	Cursor corner radius

Behavior

Parameter	Type	Default	Description
`autofocus`	`bool`	`true`	Auto-focus search field on dropdown open
`textAlign`	`TextAlign`	`.start`	Text alignment
`keyboardType`	`TextInputType?`	`.text`	Keyboard type
`textInputAction`	`TextInputAction?`	`.search`	Keyboard action button

DropdownCheckboxTheme

Styles the checkbox on each row of a FlutterMultiSelectDropdown. Reaches the box even though the menu is drawn in the root overlay, where a Theme wrapped around the widget cannot — only an app-wide CheckboxThemeData otherwise could, and that restyles every checkbox in the app. Only the fields that render on the presentational (onChanged: null, semantics-excluded) box are here.

Parameter	Type	Default	Description
`activeColor`	`Color?`	`null`	Fill of a checked box. Routed through `fillColor` so it survives the box's disabled state
`fillColor`	`WidgetStateProperty<Color?>?`	`null`	Per-state fill, for full control. Wins over `activeColor`
`checkColor`	`Color?`	`null`	Color of the checkmark
`side`	`BorderSide?`	`null`	Outline of an unchecked box (a checked box's fill covers it)
`shape`	`OutlinedBorder?`	`null`	Box shape, e.g. rounded corners
`materialTapTargetSize`	`MaterialTapTargetSize?`	`null`	Size class the box occupies
`visualDensity`	`VisualDensity?`	`null`	Density adjustment to the box's size
`mouseCursor`	`MouseCursor?`	`null`	Cursor over the box. Set to `SystemMouseCursors.click` to match the row's

Each null field defers to the ambient CheckboxThemeData.

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
`disabledTextStyle`	`TextStyle?`	`null`	Style for button text (value and hint) when disabled — merged over `textStyle` / `hintStyle`
`textAlign`	`TextAlign`	`.start`	Horizontal text alignment (also controls item alignment in menu)
`softWrap`	`bool`	`true`	Allow line breaks at word boundaries

Advanced Features

FlutterDropdownButton<String>.text(
  items: ['Apple', 'Banana', 'Cherry', 'Date', 'Elderberry'],
  value: selected,
  hint: 'Select a fruit',
  width: 250,
  searchable: true,
  onChanged: (value) => setState(() => selected = value),
)

FlutterDropdownButton<User>(
  items: users,
  value: selectedUser,
  searchable: true,
  searchFilter: (user, query) =>
    user.name.toLowerCase().contains(query.toLowerCase()),
  emptyBuilder: (query) => Center(
    child: Text('No users matching "$query"'),
  ),
  itemBuilder: (user, isSelected) => Row(
    children: [
      CircleAvatar(radius: 14, child: Text(user.name[0])),
      SizedBox(width: 8),
      Text(user.name),
    ],
  ),
  onChanged: (value) => setState(() => selectedUser = value),
)

FlutterDropdownButton<String>.text(
  items: countries,
  value: selected,
  searchable: true,
  theme: DropdownStyleTheme(
    search: SearchFieldTheme(
      backgroundColor: Colors.grey.shade100,
      height: 40,
      borderRadius: BorderRadius.circular(12),
      cursorColor: Colors.blue,
      divider: Divider(height: 1),
    ),
  ),
  onChanged: (value) => setState(() => selected = value),
)

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),
)

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) {},
)

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) {},
    ),
  ],
)

// Close with animation (trailing icon rotates back)
FlutterDropdownButton.closeAll();

// Close immediately without animation (useful before navigation)
FlutterDropdownButton.closeAll(animate: false);
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.

Documentation

Use Cases - Font picker, dynamic width, color picker, country picker examples
API Reference - Complete API documentation
Theming - Theming and styling guide
Text Configuration - Text-specific configuration guide
Migration - Migration guide from previous versions

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.

Flutter Dropdown Button

Features

Screenshots

Quick Start

Basic Usage

Text Dropdown (Fixed Width)

Text Dropdown (Dynamic Width)

Text Dropdown of a Domain Type

Custom Widget Dropdown

Custom Selected Display

Multi-Select Checklist

API Reference

FlutterDropdownButton<T>

Custom Mode (Default Constructor)

Text Mode (.text Constructor)

Common Parameters (Both Modes)

A value that is not in items

FlutterMultiSelectDropdown<T>

MenuAlignment

Theme System

DropdownTheme

Button Styling

Overlay Styling

Item Styling

Icon Styling

Disabled State

DropdownScrollTheme

DropdownTooltipTheme

Visual Styling

Behavior

SearchFieldTheme

Layout

Styling

Cursor

Behavior

DropdownCheckboxTheme

TextDropdownConfig

Advanced Features

Searchable Dropdown (Text Mode)

Searchable Dropdown (Custom Mode)

Searchable Dropdown with Custom Theme

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

Documentation

License

Changelog

Libraries

flutter_dropdown_button package

A value that is not in `items`