VelocitySpringBuilder class

Like SpringBuilder but also provides the current spring velocity to the builder. Equivalent to motor's VelocityMotionBuilder / SingleVelocityMotionBuilder.

springWhenActive is used while the user is interacting (dragging). springWhenReleased is used after the user lifts their finger. Switching between them mid-animation redirects the simulation smoothly.

Inheritance

Constructors

VelocitySpringBuilder({required double value, required SpringDescription springWhenActive, required SpringDescription springWhenReleased, required VelocitySpringWidgetBuilder builder, bool active = true, int teleportEpoch = 0, Widget? child, Key? key})
Creates a VelocitySpringBuilder.
const

Properties

active → bool
Whether the user is currently dragging (selects springWhenActive).
final
builder → VelocitySpringWidgetBuilder
The builder called on every frame with the current value and velocity.
final
child → Widget?
Optional pre-built subtree passed through to builder.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
springWhenActive → SpringDescription
Spring used while active is true (following a pointer).
final
springWhenReleased → SpringDescription
Spring used while active is false (settling to rest).
final
teleportEpoch → int
Monotonic marker for DISCONTINUOUS value changes.
final
value → double
Current target value.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<VelocitySpringBuilder>
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