AsyncUpdateScheduler class

An utility class for notifying ~once per VM turn to do an update action.

This is to handle patterns where many properties may be updated, synchronously, such as through Angular property setters, but the user would like to wait and apply an update once after they are all called.

Example: class Foo { String _bar; String _baz; AsyncUpdateScheduler _scheduler;

  Foo() {
    _scheduler = new AsyncUpdateScheduler(_doExpensiveWork);
  }

  String get bar => _bar;
  set bar(String bar) {
    if (bar != _bar) {
      _bar = bar;
      _scheduler.scheduleUpdate();
    }
  }

  String get baz => _baz;
  set baz(String baz) {
    if (baz != _baz) {
      _baz = baz;
      _scheduler.scheduleUpdate();
    }
  }

  // Will only be called once, even if both bar and baz are set.
  void doExpensive() { ... }
}

Constructors

AsyncUpdateScheduler([OnUpdateCallback? _updateCallback])
Creates a new scheduler, optionally with a callback.

Properties

hashCode → int
The hash code for this object.
no setterinherited
onUpdate → Stream<Null>
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
scheduleUpdate() → void
Asynchronously schedule an action for later in the VM turn.
toString() → String
A string representation of this object.
inherited

Operators

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