LxMap<K, V> class

A reactive map that automatically notifies observers when its entries change.

LxMap implements the standard Dart Map interface but intercepts mutating methods to trigger notifications.

Usage

final config = <String, String>{}.lx;
config['theme'] = 'dark'; // Automatically notifies observers

Inheritance

• Object
• LevitReactiveNotifier
• LxBase<Map<K, V>>
• LxVar<Map<K, V>>
• LxMap

Implemented types

• Map<K, V>

Available extensions

• LxMapExtension

Constructors

LxMap([Map<K, V>? initial, String? name])

Creates a reactive map.

LxMap.from(Map<K, V> other)

Creates an LxMap from an existing Map.

factory

Properties

entries → Iterable<MapEntry<K, V>>

The map entries of this Map.

no setter, override

graphDepth ↔ int

Returns the current depth in the dependency graph.

getter/setter pair, inherited

hashCode → int

The hash code for this object.

no setter, inherited

hasListener → bool

Whether there are active listeners.

no setter, inherited

id → int

A unique runtime identifier for this reactive instance.

final, inherited

isDisposed → bool

Whether the reactive object has been closed/disposed.

no setter, inherited

isEmpty → bool

Whether there is no key/value pair in the map.

no setter, override

isNotEmpty → bool

Whether there is at least one key/value pair in the map.

no setter, override

keys → Iterable<K>

The keys of this Map.

no setter, override

length → int

The number of key/value pairs in the map.

no setter, override

lx → LxMap<K, V>

Available on Map<K, V>, provided by the LxMapExtension extension

Wraps this map in a reactive LxMap.

no setter

name ↔ String?

An optional descriptive name for debugging and profiling.

getter/setter pair, inherited

onCancel → void Function()?

Called when the stream is cancelled.

final, inherited

onListen → void Function()?

Called when the stream is listened to.

final, inherited

ownerId ↔ String?

The registration key of the owning controller, if applicable.

getter/setter pair, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

stream → Stream<Map<K, V>>

A Stream that emits the latest value whenever it updates.

no setter, inherited

value ↔ Map<K, V>

The current state of the reactive object.

getter/setter pair, inherited

values → Iterable<V>

The values of this Map.

no setter, override

Methods

addAll(Map<K, V> other) → void

Adds all key/value pairs of other to this map.

override

addEntries(Iterable<MapEntry<K, V>> entries) → void

Adds all key/value pairs of newEntries to this map.

override

addListener(void listener()) → void

Adds a listener.

inherited

assign(Map<K, V> other) → void

Replaces all entries with those from other in a single notification.

bind(Stream<Map<K, V>> externalStream) → void

Binds an external stream to this reactive variable.

inherited

call([Map<K, V>? v]) → Map<K, V>

Functional-style update and retrieval.

inherited

cast<RK, RV>() → Map<RK, RV>

Provides a view of this map as having RK keys and RV instances, if necessary.

override

clear() → void

Removes all entries from the map.

override

close() → void

Permanently closes the reactive object and releases all internal resources.

inherited

containsKey(Object? key) → bool

Whether this map contains the given key.

override

containsValue(Object? val) → bool

Whether this map contains the given value.

override

dispose() → void

Disposes the notifier.

inherited

forEach(void action(K key, V value)) → void

Applies action to each key/value pair of the map.

override

map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>

Returns a new map where all entries of this map are transformed by the given convert function.

override

mutate(void mutator(Map<K, V> value)) → void

Mutates the value in place and triggers a refresh.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notify() → void

Alias for refresh.

inherited

putIfAbsent(K key, V ifAbsent()) → V

Look up the value of key, or add a new entry if it isn't there.

override

refresh() → void

Triggers a notification without changing the value.

inherited

remove(Object? key) → V?

Removes key and its associated value, if present, from the map.

override

removeListener(void listener()) → void

Removes a listener.

inherited

removeWhere(bool test(K key, V value)) → void

Removes all entries of this map that satisfy the given test.

override

setValueInternal(Map<K, V> val, {bool notifyListeners = true}) → void

Internal setter for subclasses (Computed, etc.)

inherited

toString() → String

A string representation of this object.

inherited

transform<R>(Stream<R> transformer(Stream<Map<K, V>> stream)) → LxStream<R>

Transforms the stream of changes using transformer.

inherited

unbind() → void

Unbinds any external stream.

inherited

update(K key, V update(V value), {V ifAbsent()?}) → V

Updates the value for the provided key.

override

updateAll(V update(K key, V value)) → void

Updates all values.

override

updateValue(Map<K, V> fn(Map<K, V> val)) → void

Updates the value using a transformation function.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

operator [](Object? key) → V?

The value for the given key, or null if key is not in the map.

override

operator []=(K key, V val) → void

Associates the key with the given value.

override