DropdownButton<T> class

A dropdown selector that lets the user choose one item from a list.

Displays the currently selected value and opens a popup menu when activated. Use hint to show placeholder text when no value is selected.

Inheritance

Constructors

DropdownButton({Key? key, required List<DropdownMenuItem<T>> items, T? value, required ValueChanged<T?>? onChanged, String? hint, FocusNode? focusNode, Color? focusColor, Color? backgroundColor, Color? dropdownColor}): Creates a DropdownButton with the given items and onChanged callback.
const

backgroundColor → Color?: The background color of the closed button.
final
dropdownColor → Color?: The background color of the dropdown menu popup.
final
focusColor → Color?: The border color when the button has focus.
final
focusNode → FocusNode?: An optional focus node for keyboard navigation.
final
hashCode → int: The hash code for this object.
no setterinherited
hint → String?: Placeholder text shown when no value is selected.
final
items → List<DropdownMenuItem<T>>: The list of menu items to choose from.
final
key → Key?: Controls how one widget replaces another in the tree.
finalinherited
onChanged → ValueChanged<T?>?: Called when the user selects a new item.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
value → T?: The currently selected value, or null if nothing is selected.
final

createElement() → StatefulElement: Creates the Element for this widget.
inherited
createState() → State<DropdownButton<T>>: Creates the mutable state for this widget.
override
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited