ListWatcher<E> class
create a Watcher of type List
- Inheritance
-
- Object
- ChangeNotifier
- Watcher<
List< E> > - ListWatcher
- Implemented types
-
- List<
E>
- List<
- Available Extensions
Constructors
-
ListWatcher(List<
E> initial) - ListWatcher.generate(int length, E generator(int index), {bool growable = true})
-
Generates a WatcherList with values.
factory
Properties
- first ↔ E
-
The first element.
getter/setter pairoverride
- hashCode → int
-
The hash code for this object.
no setterinherited
- hasListeners → bool
-
Whether any listeners are currently registered.
no setterinherited
- 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 setterinherited
- isEmpty → bool
-
Whether this collection has no elements.
no setteroverride
- isNotEmpty → bool
-
Whether this collection has at least one element.
no setteroverride
-
iterator
→ Iterator<
E> -
A new
Iterator
that allows iterating the elements of thisIterable
.no setteroverride - last ↔ E
-
The last element.
getter/setter pairoverride
- length ↔ int
-
The number of objects in this list.
getter/setter pairoverride
-
reversed
→ Iterable<
E> -
An Iterable of the objects in this list in reverse order.
no setteroverride
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- safeMode → bool
-
safeMode if enabled will not allow any setting of value or notifying any listeners if the Watcher isDisposed
finalinherited
- single → E
-
Checks that this iterable has only one element, and returns that element.
no setteroverride
-
stream
→ Stream<
List< 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 setterinherited -
v
↔ List<
E> -
Equivalent to the getter value but in shorter syntax.
getter/setter pairinherited
-
value
↔ List<
E> -
The current value stored in this watcher.
getter/setter pairinherited
Methods
-
add(
E value) → void -
Adds
value
to the end of this list, extending the length by one.override -
addAll(
Iterable< E> iterable) → void -
Appends all objects of
iterable
to the end of this list.override -
addListener(
VoidCallback listener) → void -
Register a closure to be called when the object changes.
inherited
-
any(
bool test(E element)) → bool -
Checks whether any element of this iterable satisfies
test
.override -
asMap(
) → Map< int, E> -
An unmodifiable Map view of this list.
override
-
cast<
R> () → List< R> -
Returns a view of this list as a list of
R
instances.override -
clear(
) → void -
Removes all objects from this list; the length of the list becomes zero.
override
-
contains(
Object? element) → bool -
Whether the collection contains an element equal to
element
.override -
debounce(
Duration duration, void action(List< E> value)) → VoidCallback -
Registers a debounced callback which is invoked only after the notifier's value
is stable for the specified
duration
.inherited -
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
index
th element.override -
every(
bool test(E element)) → bool -
Checks whether every element of this iterable satisfies
test
.override -
expand<
T> (Iterable< T> toElements(E element)) → Iterable<T> -
Expands each element of this Iterable into zero or more elements.
override
-
fillRange(
int start, int end, [E? fillValue, bool refresh = true]) → void -
Overwrites a range of elements with
fillValue
.override -
firstWhere(
bool test(E element), {E orElse()?}) → 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 each
element of the collection with an existing value
override
-
followedBy(
Iterable< E> other) → Iterable<E> -
Creates the lazy concatenation of this iterable and
other
.override -
forEach(
void action(E element)) → void -
Invokes
action
on each element of this iterable in iteration order.override -
getRange(
int start, int end) → Iterable< E> -
Creates an Iterable that iterates over a range of elements.
override
-
indexOf(
E element, [int start = 0]) → int -
The first index of
element
in this list.override -
indexWhere(
bool test(E element), [int start = 0]) → int -
The first index in the list that satisfies the provided
test
.override -
insert(
int index, E element) → void -
Inserts
element
at positionindex
in this list.override -
insertAll(
int index, Iterable< E> iterable) → void -
Inserts all objects of
iterable
at positionindex
in this list.override -
isEqual(
List< E> other) → bool - Compares two lists for element-by-element equality.
-
join(
[String separator = '']) → String -
Converts each element to a String and concatenates the strings.
override
-
lastIndexOf(
E element, [int? start]) → int -
The last index of
element
in this list.override -
lastIndexWhere(
bool test(E element), [int? start]) → int -
The last index in the list that satisfies the provided
test
.override -
lastWhere(
bool test(E element), {E orElse()?}) → E -
The last element that satisfies the given predicate
test
.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(List< 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 the first occurrence of
value
from this list.override -
removeAt(
int index) → E -
Removes and returns the last object in this list.
override
-
removeLast(
) → E -
Removes the object at position
index
from this list.override -
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 a range of elements from the list.
override
-
removeWhere(
bool test(E element)) → void -
Removes all objects from this list that satisfy
test
.override -
replaceRange(
int start, int end, Iterable< E> replacements) → void -
Replaces a range of elements with the elements of
replacements
.override -
retainWhere(
bool test(E element)) → void -
Removes all objects from this list that fail to satisfy
test
.override -
setAll(
int index, Iterable< E> iterable) → void -
Overwrites elements with the objects of
iterable
.override -
setRange(
int start, int end, Iterable< E> iterable, [int skipCount = 0, bool refresh = true]) → void -
Writes some elements of
iterable
into a range of this list.override -
setWithoutNotify(
List< E> newValue) → void -
inherited
-
shuffle(
[Random? random, bool refresh = true]) → void -
Shuffles the elements of this list randomly.
override
-
singleWhere(
bool test(E element), {E orElse()?}) → E -
The single element that satisfies
test
.override -
skip(
int count) → Iterable< E> -
Creates an Iterable that provides all but the first
count
elements.override -
skipWhile(
bool test(E value)) → Iterable< E> -
Creates an
Iterable
that skips leading elements whiletest
is satisfied.override -
sort(
[int compare(E a, E b)?, bool refresh = true]) → void -
Sorts this list according to the order specified by the
compare
function.override -
sublist(
int start, [int? end]) → List< E> -
Returns a new list containing the elements between
start
andend
.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> -
Creates a lazy iterable of the leading elements satisfying
test
.override -
toList(
{bool growable = true}) → List< E> -
Creates a List containing the elements of this Iterable.
override
-
toSet(
) → Set< E> -
Creates a Set containing the same elements as this iterable.
override
-
toString(
) → String -
A string representation of this object.
inherited
-
updateIf(
bool condition(List< E> ), List<E> newValue) → void -
Updates the
ValueNotifier
's value tonewValue
ifcondition
returns true.inherited -
updateOnAction<
R> (R action()) → R -
Will notifyListeners after a specific
action
has been made, and optionally return a resultR
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 +(
List< E> other) → List<E> -
Returns the concatenation of this list and
other
.override -
operator ==(
Object other) → bool -
The equality operator.
inherited
-
operator [](
int index) → E -
The object at the given
index
in the list.override -
operator []=(
int index, E value) → void -
Sets the value at the given
index
in the list tovalue
.override