AnimationState class

Animation state for a single node (standalone animations only).

Only nodes animating individually through StandaloneAnimator, an enter or an exit, carry a stored AnimationState. Expand/collapse groups track per-node extents in NodeGroupExtent, and bulk operations (expandAll/collapseAll) track keys directly in AnimationGroup sets. The stored state is dropped once the animation completes.

Constructors

AnimationState({required AnimationType type, required TreeAnimationFamily family, required double startExtent, required double targetExtent, double progress = 0.0, Object? triggeringAncestorId, double speedMultiplier = 1.0})

Properties

currentExtent ↔ double

The interpolated current extent.

getter/setter pair

family → TreeAnimationFamily

The animation family whose style spec times this state. Declared at the install site and never re-derived downstream; the standalone ticker resolves it through the live style on every tick. Required (no default) so a new install site cannot silently inherit the wrong family.

final

hashCode → int

The hash code for this object.

no setter, inherited

isComplete → bool

Whether this animation has completed.

no setter

progress ↔ double

Animation progress from 0.0 to 1.0.

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

speedMultiplier → double

Speed multiplier for proportional timing on cross-group transitions. Values > 1.0 make the animation complete proportionally faster.

final

startExtent ↔ double

The extent (height) at animation start. Mutable to allow updates when the actual size is measured.

getter/setter pair

targetExtent ↔ double

The extent (height) at animation end. Mutable to allow updates when the actual size is measured.

getter/setter pair

triggeringAncestorId → Object?

If this animation was triggered by an ancestor expanding/collapsing, this is that ancestor's ID. Used to coordinate grouped animations.

final

type → AnimationType

The type of animation.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

updateExtent([Curve curve = Curves.linear]) → void

Updates currentExtent based on progress and an optional curve.

Operators

operator ==(Object other) → bool

The equality operator.

inherited