ComputedNode<T> class

Low-level reactive node that derives a value from dependencies.

This is the graph node behind Computed. It caches the result of getter, tracks dependencies while recomputing, and supports custom equality through equals.

Prefer Computed in application code; use ComputedNode for custom derived nodes on the core graph.

Example:

final source = SignalNode<int>(1);
final doubled = ComputedNode<int>(() => source.get() * 2);
Inheritance

Constructors

ComputedNode(T getter(), {bool equals(T current, T? previous)?, JoltDebugOption? debug})
Creates a computed node that evaluates getter lazily and caches results.

Properties

deps ↔ Link?
First dependency link in the chain.
getter/setter pairinherited
depsTail ↔ Link?
Last dependency link in the chain.
getter/setter pairinherited
equals → bool Function(T current, T? previous)?
Optional equality function used to suppress propagation.
final
flags ↔ int
Reactive flags for this node.
getter/setter pairinherited
getter → T Function()
Function that computes the value while this node is the active subscriber.
final
hashCode → int
The hash code for this object.
no setterinherited
isDisposed → bool
Whether dispose has been called on this node.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
subs ↔ Link?
First subscriber link in the chain.
getter/setter pairinherited
subsTail ↔ Link?
Last subscriber link in the chain.
getter/setter pairinherited
value ↔ T?
The cached result of the last successful evaluation of getter.
getter/setter pair

Methods

dispose() → void
Disposes this node and removes it from the dependency graph.
get() → T
Returns the cached or recomputed value and links to the active subscriber.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notify() → void
Recomputes immediately and always schedules subscribers for update.
notifySoft() → void
Recomputes immediately and schedules subscribers only when the value changes.
peek() → T
Returns the current computed value without establishing a dependency.
toString() → String
A string representation of this object.
inherited
unwatched() → void
Called when this node loses its last subscriber.
override
update() → bool
Recomputes getter and updates the cached value.
override

Operators

operator ==(Object other) → bool
The equality operator.
inherited