DropdownMenuButton class - universally library

Constructors

DropdownMenuButton({Key? key, DropdownMenuButtonBuilder<T>? builder, required DropdownMenuButtonItemBuilder<T> itemBuilder, Widget? icon, T? initialValue, VoidCallback? onOpened, PopupMenuItemSelected<T>? onSelected, PopupMenuCanceled? onCanceled, String? tooltip, double? elevation, Color? shadowColor, Color? surfaceTintColor, EdgeInsetsGeometry padding = const EdgeInsets.all(8.0), Widget? child, double? splashRadius, double? iconSize, Offset offset = Offset.zero, bool enabled = true, ShapeBorder? shape, Color? color, Color? iconColor, bool? enableFeedback, BoxConstraints? constraints, PopupMenuPosition? position = PopupMenuPosition.under, Clip clipBehavior = Clip.none, bool useRootNavigator = false, AnimationStyle? popUpAnimationStyle, double rad = pi / 2, bool clockwise = true, Duration animationDuration = const Duration(milliseconds: 200), Curve curve = Curves.fastOutSlowIn}): const

animationDuration → Duration: 动画时长
final
builder → DropdownMenuButtonBuilder<T>?: final
child → Widget?: final
clipBehavior → Clip: final
clockwise → bool: 是否顺时针旋转
final
color → Color?: final
constraints → BoxConstraints?: final
curve → Curve: 动画曲线
final
elevation → double?: final
enabled → bool: final
enableFeedback → bool?: final
hashCode → int: The hash code for this object.
no setterinherited
icon → Widget?: final
iconColor → Color?: final
iconSize → double?: final
initialValue → T?: final
itemBuilder → DropdownMenuButtonItemBuilder<T>: final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
offset → Offset: final
onCanceled → PopupMenuCanceled?: final
onOpened → VoidCallback?: final
onSelected → PopupMenuItemSelected<T>?: final
padding → EdgeInsetsGeometry: final
popUpAnimationStyle → AnimationStyle?: final
position → PopupMenuPosition?: final
rad → double: 旋转角度 pi / 2 1=180℃ 2=90℃
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
shadowColor → Color?: final
shape → ShapeBorder?: final
splashRadius → double?: final
surfaceTintColor → Color?: final
tooltip → String?: final
useRootNavigator → bool: final

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<DropdownMenuButton<T>>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited