SpringTransitionPlugin class

Combines scale and fade with a spring physics curve.

Produces the "bouncy entry" effect used in iOS modals and Material 3 sheets.

Params:

• stiffness (double) — Spring stiffness. Default: 180.0
• damping (double) — Spring damping. Default: 12.0
• fromScale (double) — Starting scale. Default: 0.6
• fromOpacity (double) — Starting opacity. Default: 0.0

Usage:

MotionWidget(
  transition: SpringTransitionPlugin(),
  params: {'stiffness': 260.0, 'damping': 20.0},
  child: myWidget,
)

Inheritance

• Object
• TransitionPlugin
• SpringTransitionPlugin

Constructors

SpringTransitionPlugin()

const

Properties

affectedProperties → List<AnimatableProperty>

All widget properties this transition modifies. Used by FrameBudgeter to decide whether to skip expensive effects.

no setter, override

description → String

Human-readable description of this transition (optional, for tooling).

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

id → String

Unique identifier used to look up this plugin in TransitionRegistry.

no setter, override

isExpensive → bool

True when this effect uses expensive GPU operations (blur, shader, clip). The FrameBudgeter will disable expensive plugins under FPS threshold.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

build({required Animation<double> animation, required Widget child, Map<String, Object?> params = const {}}) → Widget

Builds the animated widget for the forward direction.

override

buildCurved({required Animation<double> animation, required Curve curve, required Widget child, Map<String, Object?> params = const {}}) → Widget

Helper — wraps build with a CurvedAnimation.

inherited

buildReverse({required Animation<double> animation, required Widget child, Map<String, Object?> params = const {}}) → Widget

Builds the animated widget for the reverse direction.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited