ListChangeNotifier<T> class Null safety

An implementation of ChangeNotifier that allows implementers to interact with this provider as if it were a Map and be notified when any changes to the map have been made

Like ChangeNotifier, this is optimized for small numbers of listeners. It is O(N) for adding and removing listeners.

K is the type of the Key to be used by this map. It is usually a String, but can be any subclass of Object. It must implement operator== and hashCode

T is the type of the Value to be used by this map. It can be any subclass of Object and has no special requirements.

Inheritance
Mixed in types
Available Extensions

Constructors

ListChangeNotifier([List<T>? backingList])

Properties

first ↔ T
Returns the first element.
read / writeinherited
hashCode → int
The hash code for this object.
read-onlyinherited
hasListeners → bool
Whether any listeners are currently registered.
@protectedread-onlyinherited
isEmpty → bool
Whether this collection has no elements.
read-onlyinherited
isNotEmpty → bool
Whether this collection has at least one element.
read-onlyinherited
iterator → Iterator<T>
Returns a new Iterator that allows iterating the elements of this Iterable.
read-onlyinherited
last ↔ T
Returns the last element.
read / writeinherited
length ↔ int
The number of objects in this list.
read / writeoverride
reversed → Iterable<T>
An Iterable of the objects in this list in reverse order.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
single → T
Checks that this iterable has only one element, and returns that element.
read-onlyinherited

Methods

add(T element) → void
Adds element to the end of this list, extending the length by one. Listeners are notified after the element is added
override
addAll(Iterable<T> iterable) → void
Appends all objects of iterable to the end of the list. Listeners are notified after all objects have been added.
override
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
any(bool test(T element)) → bool
Checks whether any element of this iterable satisfies test.
inherited
asMap() → Map<int, T>
An unmodifiable Map view of this list.
inherited
cast<R>() → List<R>
Returns a view of this list as a list of R instances.
inherited
clear() → void
Clear all objects from the list. Listeners are notified after the list is cleared.
override
contains(Object? element) → bool
Whether the collection contains an element equal to element.
inherited
dispose() → void
Discards the internal resources used by the object. After this is called, the object is not in a usable state and should be discarded.
@mustCallSuperoverride
elementAt(int index) → T
Returns the indexth element.
inherited
every(bool test(T element)) → bool
Checks whether every element of this iterable satisfies test.
inherited
expand<T>(Iterable<T> f(T element)) → Iterable<T>
Expands each element of this Iterable into zero or more elements.
inherited
fillRange(int start, int end, [T? fill]) → void
Sets the objects in the range start inclusive to end exclusive to the given fill Listeners are notified after all objects are updated.
override
firstWhere(bool test(T element), {T orElse()?}) → T
Returns the first element that satisfies the given predicate test.
inherited
fold<T>(T initialValue, T combine(T previousValue, T element)) → T
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
inherited
followedBy(Iterable<T> other) → Iterable<T>
Returns the lazy concatenation of this iterable and other.
inherited
forEach(void action(T element)) → void
Invokes action on each element of this iterable in iteration order.
inherited
getRange(int start, int end) → Iterable<T>
Creates an Iterable that iterates over a range of elements.
inherited
indexOf(Object? element, [int start = 0]) → int
The first index of element in this list.
inherited
indexWhere(bool test(T element), [int start = 0]) → int
The first index in the list that satisfies the provided test.
inherited
insert(int index, T element) → void
Insert element at the position index in this list. Listeners are notified after all objects have been repositioned.
override
insertAll(int index, Iterable<T> iterable) → void
Inserts all objects of iterable at position index in this list. Listeners are notified after all objects have been inserted.
override
join([String separator = ""]) → String
Converts each element to a String and concatenates the strings.
inherited
lastIndexOf(Object? element, [int? start]) → int
The last index of element in this list.
inherited
lastIndexWhere(bool test(T element), [int? start]) → int
The last index in the list that satisfies the provided test.
inherited
lastWhere(bool test(T element), {T orElse()?}) → T
Returns the last element that satisfies the given predicate test.
inherited
map<T>(T f(T element)) → Iterable<T>
The current elements of this iterable modified by toElement.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
notifyListeners() → void
Notify all the listeners, respecting our paused state falg
inherited
pauseNotifications<T>(ChangeHandler<T> handler, [bool notifyAfter = false]) → T
Pause notifications until after a synchronous handler has completed. If notifyAfter is true, then listeners will automatically be notified after the callback completes. Otherwise, you must notify the listeners;
inherited
pauseNotificationsAsync<T>(AsyncChangeHandler<T> handler, [bool notifyAfter = false]) → Future<T>
Pause notifications until after an asynchronous handler has completed. If notifyAfter is true, then listeners will automatically be notified after the callback completes. Otherwise, you must notify the listeners;
inherited
reduce(T combine(T previousValue, T element)) → T
Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.
inherited
remove(Object? element) → bool
Removes the first occurrence of value from this list.
inherited
removeAt(int index) → T
Removes the object at position index from the list. Listeners are notified after all objects have been repositioned.
override
removeLast() → T
Removes and returns the last object in this list.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
removeRange(int start, int end) → void
Removes the objects in the range start inclusive to end exclusive. Listeners are notified after all objects are removed.
override
removeWhere(bool test(T element)) → void
Removes all objects from this list that satisfy test. Listeners are notified after all objects have been removed.
override
replaceRange(int start, int end, Iterable<T> newContents) → void
Removes the objects in the range start inclusive to end exclusive and inserts the contents of newContents in its place. Listeners are notified after all the objects have been replaced.
override
retainWhere(bool test(T element)) → void
Removes all objects from the list that fail to satisfy test. Listeners are notified after all objects have been removed.
override
setAll(int index, Iterable<T> iterable) → void
Overwrites objects of this with the objects of iterable start at positions index in this list. Listeners are notified after all objects have been set.
override
setRange(int start, int end, Iterable<T> iterable, [int skipCount = 0]) → void
Copies the objects of iterable, skipping skipCount object first, into the range start inclusive to end exclusive of the list. Listeners are notified after all the values have been set.
override
shuffle([Random? random]) → void
Shuffles the elements of this list randomly. Listeners are notified after shuffling is completed.
override
singleWhere(bool test(T element), {T orElse()?}) → T
Returns the single element that satisfies test.
inherited
skip(int count) → Iterable<T>
Returns an Iterable that provides all but the first count elements.
inherited
skipWhile(bool test(T element)) → Iterable<T>
Returns an Iterable that skips leading elements while test is satisfied.
inherited
sort([int compare(T a, T b)?]) → void
Sorts this list according to the order specified by the compare function. Listeners are notified after sorting is completed.
override
sublist(int start, [int? end]) → List<T>
Returns a new list containing the elements between start and end.
inherited
take(int count) → Iterable<T>
Returns a lazy iterable of the count first elements of this iterable.
inherited
takeWhile(bool test(T element)) → Iterable<T>
Returns a lazy iterable of the leading elements satisfying test.
inherited
toList({bool growable = true}) → List<T>
Creates a List containing the elements of this Iterable.
inherited
toSet() → Set<T>
Creates a Set containing the same elements as this iterable.
inherited
toString() → String
A string representation of this object.
inherited
where(bool test(T element)) → Iterable<T>
Returns a new lazy Iterable with all elements that satisfy the predicate test.
inherited
whereType<T>() → Iterable<T>
Returns a new lazy Iterable with all elements that have type T.
inherited

Operators

operator +(List<T> other) → List<T>
Returns the concatenation of this list and other.
inherited
operator ==(Object other) → bool
The equality operator.
inherited
operator [](int index) → T
Returns the object at the given index in the list or throws a RangeError if index is out of bounds.
override
operator []=(int index, T value) → void
Sets the value at the given index in the list to value or throws a RangeError if index is out of bounds.
override