SetWatcher<E> class

create a Watcher of type Set, which reacts just like normal Set, but with watcher capabilities.

Inheritance

• Object
• ChangeNotifier
• Watcher<Set<E>>
• SetWatcher

Implemented types

• Set<E>

Available Extensions

• EnumByName
• IterableExtensions
• NullableIterableExtensions
• SetWatcherEx
• WatcherListenableExtension
• WatcherValueListenableExtension

Constructors

SetWatcher(Set<E> initial)

Properties

first → E

The first element.

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

hasListeners → bool

Whether any listeners are currently registered.

no setter, inherited

isDisposed → bool

Flag which returns true if you called the dispose method. It is useful when you want to safely do some operations on the Watcher without getting an exception if it gets disposed.

no setter, inherited

isEmpty → bool

Whether this collection has no elements.

no setter, override

isNotEmpty → bool

Whether this collection has at least one element.

no setter, override

iterator → Iterator<E>

An iterator that iterates over the elements of this Watcher's value.

no setter, override

last → E

The last element.

no setter, override

length → int

The number of elements in this.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

safeMode → bool

safeMode if enabled will not allow any setting of value or notifying any listeners if the Watcher isDisposed

final, inherited

single → E

Checks that this iterable has only one element, and returns that element.

no setter, override

stream → Stream<Set<E>>

Converts the Watcher into a Stream. This stream emits values whenever the value changes. The use of distinct ensures that consecutive duplicate values are filtered out, thus the stream only emits when the value actually changes.

no setter, inherited

v ↔ Set<E>

Equivalent to the getter value but in shorter syntax.

getter/setter pair, inherited

value ↔ Set<E>

The current value stored in this watcher.

getter/setter pair, inherited

Methods

add(E value) → bool

Adds value to this Watcher's value.

override

addAll(Iterable<E> elements) → void

Adds all elements to this Watcher's value.

override

addListener(VoidCallback listener) → void

Register a closure to be called when the object changes.

inherited

any(bool test(E element)) → bool

Converts each element to a String and concatenates the strings.

override

cast<R>() → Set<R>

Provides a view of this Watcher's value as a set of R instances.

override

clear() → void

Removes all elements from this Watcher's value.

override

contains(Object? value) → bool

Whether value is in this Watcher's value.

override

containsAll(Iterable<Object?> other) → bool

Whether this Watcher's value contains all the elements of other.

override

debounce(Duration duration, void action(Set<E> value)) → VoidCallback

Registers a debounced callback which is invoked only after the notifier's value is stable for the specified duration.

inherited

difference(Set<Object?> other) → Set<E>

Creates a new set with the elements of this that are not in other.

override

dispose() → void

Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).

inherited

elementAt(int index) → E

Returns the indexth element.

override

every(bool test(E element)) → bool

Reduces a collection to a single value by iteratively combining each element of the collection with an existing value

override

expand<T>(Iterable<T> toElements(E element)) → Iterable<T>

Expands each element of this Iterable into zero or more elements.

override

firstWhere(bool test(E element), {E orElse()?, bool refresh = true}) → E

The first element that satisfies the given predicate test.

override

fold<T>(T initialValue, T combine(T previousValue, E element)) → T

Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.

override

followedBy(Iterable<E> other) → Iterable<E>

Creates the lazy concatenation of this iterable and other.

override

forEach(void action(E element)) → void

Whether the collection contains an element equal to element.

override

intersection(Set<Object?> other) → Set<E>

Creates a new set which is the intersection between this Watcher's value and other.

override

isEqual(Set<E> other) → bool

Compares two sets for element-by-element equality.

join([String separator = '']) → String

Checks whether every element of this iterable satisfies test.

override

lastWhere(bool test(E element), {E orElse()?, bool refresh = true}) → E

The last element that satisfies the given predicate test.

override

lookup(Object? object) → E?

If an object equal to object is in this Watcher's value, return it.

override

map<T>(T toElement(E e)) → Iterable<T>

The current elements of this iterable modified by toElement.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notifyListeners() → void

Call all the registered listeners.

inherited

onChange(void action(Set<E> value)) → VoidCallback

Registers a callback to be invoked whenever the ValueNotifier's value changes.

inherited

reduce(E combine(E value, E element)) → E

Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.

override

refresh() → void

Rebuilds and trigger any listeners of any WatchValue or watch attached to that Watcher.

inherited

remove(Object? value) → bool

Removes value from this Watcher's value.

override

removeAll(Iterable<Object?> elements) → void

Removes each element of elements from this Watcher's value.

override

removeListener(VoidCallback listener) → void

Remove a previously registered closure from the list of closures that are notified when the object changes.

inherited

removeWhere(bool test(E element)) → void

Removes all elements of this Watcher's value that satisfy test.

override

retainAll(Iterable<Object?> elements) → void

Removes all elements of this Watcher's value that are not elements in elements.

override

retainWhere(bool test(E element)) → void

Removes all elements of this Watcher's value that fail to satisfy test.

override

setWithoutNotify(Set<E> newValue) → void

inherited

singleWhere(bool test(E element), {E orElse()?, bool refresh = true}) → E

The single element that satisfies test.

override

skip(int count) → Iterable<E>

Reduces a collection to a single value by iteratively combining each element of the collection with an existing value

override

skipWhile(bool test(E value)) → Iterable<E>

Checks whether every element of this iterable satisfies test.

override

take(int count) → Iterable<E>

Creates a lazy iterable of the count first elements of this iterable.

override

takeWhile(bool test(E value)) → Iterable<E>

Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.

override

toList({bool growable = true, bool refresh = true}) → List<E>

Checks whether any element of this iterable satisfies test.

override

toSet() → Set<E>

Creates a Set with the same elements and behavior as this Set.

override

toString() → String

A string representation of this object.

inherited

union(Set<E> other) → Set<E>

Creates a new set which contains all the elements of this Watcher's value and other.

override

updateIf(bool condition(Set<E>), Set<E> newValue) → void

Updates the ValueNotifier's value to newValue if condition returns true.

inherited

updateOnAction<R>(R action()) → R

Will notifyListeners after a specific action has been made, and optionally return a result R of certain type.

inherited

where(bool test(E element)) → Iterable<E>

Creates a new lazy Iterable with all elements that satisfy the predicate test.

override

whereType<T>() → Iterable<T>

Creates a new lazy Iterable with all elements that have type T.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited