widgets library

DragTarget<T> 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, DragTargetWillAccept<T> onWillAccept, DragTargetAccept<T> onAccept, DragTargetLeave<T> onLeave }): Creates a widget that receives drags. [...]
const

Properties

builder → DragTargetBuilder<T>: Called to build the contents of this widget. [...]
final
onAccept → DragTargetAccept<T>: Called when an acceptable piece of data was dropped over this drag target.
final
onLeave → DragTargetLeave<T>: Called when a given piece of data being dragged over this target leaves the target.
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
hashCode → int: The hash code for this object. [...]
read-only, inherited
key → Key: Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

Methods

createState() → _DragTargetState<T>: Creates the mutable state for this widget at a given location in the tree. [...]
override
createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent 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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String: Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) → 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 ==(dynamic other) → bool: The equality operator. [...]
inherited