MyDragProtectedArea class

拖拽保护区域，用于解决子组件拖拽手势与窗口拖拽之间的竞争冲突。

桌面端 CustomDragArea 的 onPanStart 会拦截所有 pan 手势来触发 windowManager.startDragging()，导致 ReorderableListView、Draggable 等需要拖拽手势的组件无法正常工作。

本组件通过在 pointer 事件层（早于手势识别阶段）临时禁用窗口拖拽来解决此问题：

  • onPointerDown: 保存当前拖拽状态并禁用窗口拖拽
  • onPointerUp / onPointerCancel: 恢复先前的拖拽状态

移动端不存在此问题，组件会直接返回 child，零开销。

示例：

MyDragProtectedArea(
  child: ReorderableListView(
    children: items,
    onReorder: (oldIndex, newIndex) { /* ... */ },
  ),
)
Inheritance
Available extensions

Constructors

MyDragProtectedArea({Key? key, required Widget child})
const

Properties

child → Widget
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
marginZero → Widget

Available on Widget, provided by the WidgetMarginX extension

no setter
paddingZero → Widget

Available on Widget, provided by the WidgetPaddingX extension

no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
sliverBox → Widget

Available on Widget, provided by the WidgetSliverBoxX extension

no setter

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<MyDragProtectedArea>
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
marginAll(double margin) → Widget

Available on Widget, provided by the WidgetMarginX extension

marginOnly({double left = 0.0, double top = 0.0, double right = 0.0, double bottom = 0.0}) → Widget

Available on Widget, provided by the WidgetMarginX extension

marginSymmetric({double horizontal = 0.0, double vertical = 0.0}) → Widget

Available on Widget, provided by the WidgetMarginX extension

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
paddingAll(double padding) → Widget

Available on Widget, provided by the WidgetPaddingX extension

paddingOnly({double left = 0.0, double top = 0.0, double right = 0.0, double bottom = 0.0}) → Widget

Available on Widget, provided by the WidgetPaddingX extension

paddingSymmetric({double horizontal = 0.0, double vertical = 0.0}) → Widget

Available on Widget, provided by the WidgetPaddingX extension

setFocus({String? focusKey, VoidCallback? onPressed, bool opacity = false, Color focusedBorderColor = Colors.grey, double borderWidth = 1.5, Duration animationDuration = const Duration(milliseconds: 350), double opacityBeginScale = 0.65}) → Widget

Available on Widget, provided by the XlyFocusableExtension extension

showRightMenu({required BuildContext context, required List<MyMenuElement> menuElements, MyMenuPopStyle animationStyle = MyMenuPopStyle.scale, MyMenuStyle? style}) → Widget

Available on Widget, provided by the RightClickMenuExtension extension

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

Operators

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