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.
See also:
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- DragTarget
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
dataisnull.final -
onAcceptWithDetails
→ DragTargetAcceptWithDetails<
T> ? -
Called when an acceptable piece of data was dropped over this drag target.
It will not be called if
dataisnull.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
dataisnull.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}) → 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