MyDraggable<T> class
A widget that can be dragged from to a MyDragTarget.
When a MyDraggable widget recognizes the start of a drag gesture, it displays a feedback widget that tracks the user's finger across the screen. If the user lifts their finger while on top of a MyDragTarget, that target is given the opportunity to accept the data carried by the MyDraggable.
On multitouch devices, multiple drags can occur simultaneously because there can be multiple pointers in contact with the device at once. To limit the number of simultaneous drags, use the maxSimultaneousDrags property. The default is to allow an unlimited number of simultaneous drags.
This widget displays child when zero drags are under way. If childWhenDragging is non-null, this widget instead displays childWhenDragging when one or more drags are underway. Otherwise, this widget always displays child.
See also:
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- MyDraggable
- Implementers
Constructors
-
MyDraggable.new({Key? key, required Widget? child, required Widget? feedback, required T data, required Widget? childWhenDragging, Offset feedbackOffset = Offset.zero, DragAnchor dragAnchor = DragAnchor.child, Axis affinity = Axis.vertical, int? maxSimultaneousDrags = 1, VoidCallback? onDragStarted, MyDraggableCanceledCallback? onMyDraggableCanceled, VoidCallback? onDragCompleted, ValueChanged<
Offset> ? onMove}) -
Creates a widget that can be dragged to a MyDragTarget.
const
Properties
- affinity → Axis
-
Controls how this widget competes with other gestures to initiate a drag.
final
- child → Widget?
-
The widget below this widget in the tree.
final
- childWhenDragging → Widget?
-
The widget to display instead of child when one or more drags are under way.
final
- data → T
-
The data that will be dropped by this MyDraggable.
final
- dragAnchor → DragAnchor
-
Where this widget should be anchored during a drag.
final
- feedback → Widget?
-
The widget to show under the pointer when a drag is under way.
final
- feedbackOffset → Offset
-
The feedbackOffset can be used to set the hit test target point for the
purposes of finding a drag target. It is especially useful if the feedback
is transformed compared to the child.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- maxSimultaneousDrags → int?
-
How many simultaneous drags to support.
final
- onDragCompleted → VoidCallback?
-
Called when the MyDraggable is dropped and accepted by a MyDragTarget.
final
- onDragStarted → VoidCallback?
-
Called when the MyDraggable starts being dragged.
final
-
onMove
→ ValueChanged<
Offset> ? -
final
- onMyDraggableCanceled → MyDraggableCanceledCallback?
-
Called when the MyDraggable is dropped without being accepted by a MyDragTarget.
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
-
createRecognizer(
GestureMultiDragStartCallback onStart) → GestureRecognizer - Creates a gesture recognizer that recognizes the start of the drag.
-
createState(
) → MyDraggableState< 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, 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