ReactiveBlock class

A reactive block outside the widget tree.

Runs the given function immediately and re-runs it whenever any observable it read through watch changes — the non-widget counterpart of Obx, and an alternative to a controller's sync that discovers its dependencies instead of taking them as an explicit list.

_block = ReactiveBlock((ref) {
  state.canSubmit.value =
      ref.watch(state.amount) > 0 && !ref.watch(state.isBusy);
});

Nothing cancels it for you: call dispose from the owner's dispose.

Implemented types

• ReactiveBlockRef

Constructors

ReactiveBlock(void _reactiveBlockFunc(ReactiveBlockRef ref))

Creates the block and runs _reactiveBlockFunc once, immediately.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

dispose() → void

Cancels every subscription the block picked up.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

watch<T>(ValueListenable<T> observable) → T

Returns the current value of observable and subscribes the enclosing reactive block to it.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited