ZoneDelegate class - dart:async library (original) (raw)

An adapted view of the parent zone.

This class allows the implementation of a zone method to invoke methods on the parent zone while retaining knowledge of the originating zone.

Custom zones (created through Zone.fork or runZoned) can provide implementations of most methods of zones. This is similar to overriding methods on Zone, except that this mechanism doesn't require subclassing.

A custom zone function (provided through a ZoneSpecification) typically records or wraps its parameters and then delegates the operation to its parent zone using the provided ZoneDelegate.

While zones have access to their parent zone (through Zone.parent) it is recommended to call the methods on the provided parent delegate for two reasons:

  1. the delegate methods take an additional zone argument which is the zone the action has been initiated in.
  2. delegate calls are more efficient, since the implementation knows how to skip zones that would just delegate to their parents.

Properties

hashCode → int

The hash code for this object.

no setterinherited

runtimeType → Type

A representation of the runtime type of the object.

no setterinherited

Methods

createPeriodicTimer(Zone zone, Duration period, void f(Timer timer))→ Timer

createTimer(Zone zone, Duration duration, void f())→ Timer

errorCallback(Zone zone, Object error, StackTrace? stackTrace)→ AsyncError?

fork(Zone zone, ZoneSpecification? specification, Map? zoneValues)→ Zone

handleUncaughtError(Zone zone, Object error, StackTrace stackTrace)→ void

noSuchMethod(Invocation invocation)→ dynamic

Invoked when a nonexistent method or property is accessed.

inherited

print(Zone zone, String line)→ void

registerBinaryCallback<R, T1, T2>(Zone zone, R f(T1 arg1, T2 arg2))→ ZoneBinaryCallback<R, T1, T2>

registerCallback<R>(Zone zone, R f())→ ZoneCallback<R>

registerUnaryCallback<R, T>(Zone zone, R f(T arg))→ ZoneUnaryCallback<R, T>

run<R>(Zone zone, R f())→ R

runBinary<R, T1, T2>(Zone zone, R f(T1 arg1, T2 arg2), T1 arg1, T2 arg2)→ R

runUnary<R, T>(Zone zone, R f(T arg), T arg)→ R

scheduleMicrotask(Zone zone, void f())→ void

toString()→ String

A string representation of this object.

inherited

Operators

operator ==(Object other)→ bool

The equality operator.

inherited