Computed<T> class

A computed reactive value.

Computed values are:

  • Lazy: Only computed when accessed
  • Cached: Reuses the last value if dependencies haven't changed
  • Reactive: Tracks its own dependents and notifies them when it changes
Available extensions

Constructors

Computed(T _getter())
Creates a new computed value with the given getter function.

Properties

hashCode → int
The hash code for this object.
no setterinherited
isDirty → bool
Whether the computed value needs to be recalculated.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
value → T
The computed value.
no setter

Methods

asReadonly() → Readonly<T>

Available on Computed<T>, provided by the ReadonlyComputed extension

Create a readonly view of this computed.
call() → T
Makes Computed callable, returning the reactive value.
invalidate() → void
Force the computed to recalculate on next access.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
override
watch(BuildContext context) → T

Available on Computed<T>, provided by the ComputedWatchExtension extension

Watch this computed's value and rebuild only this widget when it changes.

Operators

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