WFormDropdown<T> class

表单下拉选择组件

选项由 items 提供（键为值、值为展示文本），选中值必须存在于 items； 容器、提示、图标与弹层背景色等可通过 WFormDropdownConfig 配置， 只读状态会合并外层 WFormReadOnlyScope。

Inheritance
Available extensions

Constructors

WFormDropdown({Key? key, required WFormDropdownConfig config, required String name, required Map<T, String> items, T? initialValue, ValueChanged<T?>? onChanged, FormFieldValidator<T>? validator, Widget? hint, String? hintText, bool? enabled, double? width})
创建下拉选择组件
const

Properties

config → WFormDropdownConfig
下拉选择配置
final
enabled → bool?
是否启用（null 时使用 WFormDropdownConfig.enabled）
final
hashCode → int
The hash code for this object.
no setterinherited
hint → Widget?
提示 widget（优先于 hintText）
final
hintText → String?
提示文本
final
initialValue → T?
初始值
final
items → Map<T, String>
选项映射，键为值，值为显示文本
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
name → String
字段名称
final
notificationListenerBuilder → WNotificationListenerBuilder<Notification>

Available on Widget, provided by the WNotificationListenerBuilderExtension extension

创建 WNotificationListenerBuilder 实例
no setter
onChanged → ValueChanged<T?>?
值变化回调
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
validator → FormFieldValidator<T>?
校验器
final
width → double?
宽度
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
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
expanded([int flex = 1]) → Widget

Available on Widget, provided by the WWidgetExtension extension

将 Widget 包装在 Expanded 中
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toButton({GestureTapCallback? onTap, GestureLongPressCallback? onLongPress, WButtonConfig? config}) → Widget

Available on Widget, provided by the WUiWidgetExtension extension

将 Widget 包装在 WButton 中
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, int wrapWidth = 65}) → 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
withBottomPadding(double padding) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加底部 padding
withBottomSafeSpace() → Widget

Available on Widget, provided by the WWidgetExtension extension

添加底部安全空间（适配底部导航栏）
withBottomSpace(double height) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加自定义底部空间
withContainer(WContainerConfig config) → Widget

Available on Widget, provided by the WUiWidgetExtension extension

将 Widget 包装在 Container 中
withHorizontalPadding(double padding) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加水平 padding
withLeftPadding(double padding) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加左侧 padding
withRightPadding(double padding) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加右侧 padding
withTopPadding(double padding) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加顶部 padding
withTopSafeSpace() → Widget

Available on Widget, provided by the WWidgetExtension extension

添加顶部安全空间（适配状态栏）
withVerticalPadding(double padding) → Widget

Available on Widget, provided by the WWidgetExtension extension

添加垂直 padding

Operators

operator ==(Object other) → bool
The equality operator.
inherited