ElasticBoundedDraggable class

A pre-configured GesturePhysicsAnimator for things like a draggable FAB or floating panel: confined to bounds, bouncing elastically off its edges, and — unlike DraggableCard — staying wherever it's dropped instead of springing back to its origin.

Inheritance

Constructors

ElasticBoundedDraggable({Key? key, required Widget child, required Rect bounds, SpringDescription spring = SpringPresets.bouncy, double boundaryDamping = 0.5, bool snapBackToOrigin = false, Axis? lockAxis, double velocityThreshold = 50, ValueChanged<Offset>? onPositionChanged, ValueChanged<DragEndDetails>? onReleased})
const

Properties

boundaryDamping → double
Fraction of velocity lost on each bounce off bounds, in [0, 1].
final
bounds → Rect
The rectangle — relative to the child's original position — that it's confined to.
final
child → Widget
The widget to make draggable, e.g. a FloatingActionButton.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
lockAxis → Axis?
Restricts dragging to a single axis. null allows free 2-D movement.
final
onPositionChanged → ValueChanged<Offset>?
Called every time the element's position changes.
final
onReleased → ValueChanged<DragEndDetails>?
Called when the element is released, with the gesture's raw details.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
snapBackToOrigin → bool
Whether the element springs back to its original position after every release. Defaults to false, so it stays wherever it's dropped within bounds — the usual behavior for a draggable FAB or panel.
final
spring → SpringDescription
The spring used when snapBackToOrigin is true. Defaults to SpringPresets.bouncy, for a lively bounce off the edges.
final
velocityThreshold → double
Release speed (logical pixels/second) at or above which a release counts as a throw rather than a drop.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
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