A widget that can be dragged from to a DragTarget.
When a draggable 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 DragTarget, that target is given the opportunity to accept the data carried by the draggble.
See also:
- Inheritance
- Object
- Widget
- StatefulWidget
- Draggable
Constructors
- Draggable({Key key, @required Widget child, @required Widget feedback, T data, Widget childWhenDragging, Offset feedbackOffset: Offset.zero, DragAnchor dragAnchor: DragAnchor.child, Axis affinity, int maxSimultaneousDrags, VoidCallback onDragStarted, DraggableCanceledCallback onDraggableCanceled })
-
Creates a widget that can be dragged to a DragTarget.
Properties
- affinity → Axis
-
Controls how this widget competes with other gestures to initiate a drag.
read-only - child → Widget
-
The widget below this widget in the tree.
read-only - childWhenDragging → Widget
-
The widget to show instead of child when a drag is under way.
read-only - data → T
-
The data that will be dropped by this draggable.
read-only - dragAnchor → DragAnchor
-
Where this widget should be anchored during a drag.
read-only - feedback → Widget
-
The widget to show under the pointer when a drag is under way.
read-only - 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.
read-only - maxSimultaneousDrags → int
-
How many simultaneous drags to support.
read-only - onDraggableCanceled → DraggableCanceledCallback
-
Called when the draggable is dropped without being accepted by a DragTarget.
read-only - onDragStarted → VoidCallback
-
Called when the draggable starts being dragged.
read-only - hashCode → int
-
Get a hash code for this object.
read-only, inherited - key → Key
-
Controls how one widget replaces another widget in the tree.
read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
createRecognizer(
GestureMultiDragStartCallback onStart) → MultiDragGestureRecognizer<MultiDragPointerState> -
Creates a gesture recognizer that recognizes the start of the drag.
-
createState(
) → _DraggableState<T> -
Creates the mutable state for this widget at a given location in the tree.
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited -
debugFillDescription(
List<String> description) → void -
Add additional information to the given description for use by toString.
inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited -
toString(
) → String -
Returns a string representation of this object.
inherited -
toStringShort(
) → String -
A short, textual description of this widget.
inherited