DragTarget class - widgets library

DragTarget<T extends Object> class

A widget that receives data when a Draggable widget is dropped.

When a draggable is dragged on top of a drag target, the drag target is asked whether it will accept the data the draggable is carrying. If the user does drop the draggable on top of the drag target (and the drag target has indicated that it will accept the draggable's data), then the drag target is asked to accept the draggable's data.

Constructors

DragTarget({Key? key, required DragTargetBuilder<T> builder, @Deprecated('Use onWillAcceptWithDetails instead. ' 'This callback is similar to onWillAcceptWithDetails but does not provide drag details. ' 'This feature was deprecated after v3.14.0-0.2.pre.') DragTargetWillAccept<T>? onWillAccept, DragTargetWillAcceptWithDetails<T>? onWillAcceptWithDetails, @Deprecated('Use onAcceptWithDetails instead. ' 'This callback is similar to onAcceptWithDetails but does not provide drag details. ' 'This feature was deprecated after v3.14.0-0.2.pre.') DragTargetAccept<T>? onAccept, DragTargetAcceptWithDetails<T>? onAcceptWithDetails, DragTargetLeave<T>? onLeave, DragTargetMove<T>? onMove, HitTestBehavior hitTestBehavior = HitTestBehavior.translucent}): Creates a widget that receives drags.
const

Properties

builder → DragTargetBuilder<T>: Called to build the contents of this widget.
final
hashCode → int: The hash code for this object.
no setterinherited
hitTestBehavior → HitTestBehavior: How to behave during hit testing.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
onAccept → DragTargetAccept<T>?: Called when an acceptable piece of data was dropped over this drag target. It will not be called if data is null.
final
onAcceptWithDetails → DragTargetAcceptWithDetails<T>?: Called when an acceptable piece of data was dropped over this drag target. It will not be called if data is null.
final
onLeave → DragTargetLeave<T>?: Called when a given piece of data being dragged over this target leaves the target.
final
onMove → DragTargetMove<T>?: Called when a Draggable moves within this DragTarget. It will not be called if data is null.
final
onWillAccept → DragTargetWillAccept<T>?: Called to determine whether this widget is interested in receiving a given piece of data being dragged over this drag target.
final
onWillAcceptWithDetails → DragTargetWillAcceptWithDetails<T>?: Called to determine whether this widget is interested in receiving a given piece of data being dragged over this drag target.
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<DragTarget<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