ElementValueChange<E, V> class

Represents a value change for a specific element within a collection.

This specialized ValueChange associates a value change with a particular element, making it useful for tracking changes to individual items in Collective collections like CollectiveList, CollectiveSet, or CollectiveQueue.

Example:

final element = MyElement();
final change = ElementValueChange(
  element: element,
  before: 'old value',
  after: 'new value'
);

The class provides an unmodifiable variant through ElementValueChange.unmodifiable, which is particularly useful when propagating change notifications through a reactive system.

Implemented types

• ValueChange<V>

Constructors

ElementValueChange.new({required E element, required V? after, V? before})

Creates an ElementValueChange recording a change to a specific element.

ElementValueChange.unmodifiable(ElementValueChange<E, V> source)

Creates an unmodifiable version of an ElementValueChange.

factory

Properties

after → V?

The value after the change occurred.

final

before → V?

The value before the change occurred.

final

element → E

The element that was changed.

final

hashCode → int

The hash code for this object.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

unmodifiable → ElementValueChange<E, V>

Returns an unmodifiable version of this value change.

late, final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override