AnimatedDraggableOverlayWrapper class
============================================================ 可拖动 + 自动吸边 + 动画过渡 的 Overlay 包装类（方案二）
特性：
- 支持任意 Widget 作为子组件，尺寸自动测量
- 拖动时实时限制在屏幕边界内（含安全区）
- snapToEdge 控制松手后是否自动吸边
- 吸边时平滑动画过渡到最近边缘
- initialCorner 预设初始位置（四角 + 居中 + 自定义）
- 首次渲染无位移、无动画，直接出现在目标位置
- snapThreshold 控制距离边缘多少以内才吸边；为 null 时始终吸边
- 吸边优先级：左右优先，只有左右都很远且上下相对更近时才吸上下
-
子组件尺寸变化后自动重新测量，并保持吸边状态 / 重新约束位置
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- AnimatedDraggableOverlayWrapper
Constructors
-
AnimatedDraggableOverlayWrapper({Key? key, required Widget child, bool snapToEdge = true, DraggableCorner initialCorner = DraggableCorner.bottomRight, Offset? initialPosition, double initialMargin = 16, VoidCallback? onTap, VoidCallback? onDragStart, ValueChanged<
Offset> ? onDragEnd, Duration snapAnimationDuration = const Duration(milliseconds: 350), Curve snapAnimationCurve = Curves.easeOutCubic, EdgeInsets childPadding = EdgeInsets.zero, double edgeMargin = 0, double? snapThreshold}) -
const
Properties
- child → Widget
-
被包裹的子组件
final
- childPadding → EdgeInsets
-
子组件周围的留白（用于阴影、发光等不影响拖拽区域的效果）
final
- edgeMargin → double
-
吸附到边缘时保留的额外间距（0 表示紧贴边缘）
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- initialCorner → DraggableCorner
-
预设初始位置（角落）
final
- initialMargin → double
-
预设角落时距离边缘的间距
final
- initialPosition → Offset?
-
自定义初始位置（仅当 initialCorner == DraggableCorner.custom 时生效）
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
-
onDragEnd
→ ValueChanged<
Offset> ? -
拖动结束回调，返回最终位置
final
- onDragStart → VoidCallback?
-
拖动开始回调
final
- onTap → VoidCallback?
-
点击回调（非拖动时触发）
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- snapAnimationCurve → Curve
-
吸边动画曲线
final
- snapAnimationDuration → Duration
-
吸边动画时长
final
- snapThreshold → double?
-
距离边缘多少像素以内才触发吸边。
final
- snapToEdge → bool
-
是否在松手后自动吸附到最近的屏幕边缘
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< AnimatedDraggableOverlayWrapper> -
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, 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