1. polymer
  2. polymer
  3. ChangeNotifier

abstract class ChangeNotifier

Mixin and base class for implementing an Observable object that performs its own change notifications, and does not need to be considered by Observable.dirtyCheck.

When a field, property, or indexable item is changed, a derived class should call notifyPropertyChange. See that method for an example.

Implements
  • Observable
Implemented by

Constructors

ChangeNotifier()

Properties

changes → Stream<List<ChangeRecord>>

read-only
hashCode → int

Get a hash code for this object.…

read-only, inherited
hasObservers → bool

True if this object has any observers, and should call notifyPropertyChange for changes.

read-only
runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

Operators

operator ==(other) → bool

The equality operator.…

inherited

Methods

deliverChanges() → bool

Synchronously deliver pending changes. Returns true if any records were delivered, otherwise false.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.…

inherited
notifyChange(ChangeRecord record) → void

Notify observers of a change.…

notifyPropertyChange(Symbol field, Object oldValue, Object newValue) → dynamic

Notify that the field name of this object has been changed.…

observed() → void

Override this method to be called when the changes are first observed.

toString() → String

Returns a string representation of this object.

inherited
unobserved() → void

Override this method to be called when the changes are no longer being observed.