DropdownMenuButton class
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- DropdownMenuButton
- Available extensions
Constructors
-
DropdownMenuButton({Key? key, required DropdownMenuButtonBuilder builder, required DropdownMenuButtonIndexBuilder itemBuilder, required int itemCount, ValueCallback<
int> ? onChanged, Color? backgroundColor, Decoration? decoration, EdgeInsetsGeometry? margin, EdgeInsetsGeometry? padding = const EdgeInsets.symmetric(horizontal: 4), Widget? icon}) -
const
-
DropdownMenuButton.material({Key? key, Color? iconColor, double iconSize = 24, IconData? iconData, required DropdownMenuButtonBuilder builder, required int itemCount, required DropdownMenuButtonIndexBuilder itemBuilder, ValueCallback<
int> ? onChanged, Color? backgroundColor, Decoration? decoration, EdgeInsetsGeometry? margin, EdgeInsetsGeometry? padding = const EdgeInsets.symmetric(horizontal: 4)})
Properties
- backgroundColor → Color?
-
menu 属性
final
- builder → DropdownMenuButtonBuilder
-
当前选中显示的 内容
index== null 可显示 请选择final - decoration → Decoration?
-
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- icon → Widget?
-
旋转组件
final
- itemBuilder → DropdownMenuButtonIndexBuilder
-
item UI
final
- itemCount → int
-
item
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- margin → EdgeInsetsGeometry?
-
final
-
onChanged
→ ValueCallback<
int> ? -
index 改变
final
- padding → EdgeInsetsGeometry?
-
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< DropdownMenuButton> -
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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited