NoneCell<T> class

A stateless cell which evaluates to ValueCell.none().

The purpose of the type argument T is to allow this cel to be used where a ValueCell with a specific type is expected. Otherwise the type argument has no effect on its functionality, since it never returns a value.

Inheritance
Available extensions

Constructors

NoneCell()
const

Properties

asyncState → ValueCell<AsyncState<T>>

Available on FutureCell<T>, provided by the WaitCellExtension extension

A cell that evaluates to the AsyncState of the Future in this cell.
no setter
awaited → ValueCell<T>

Available on FutureCell<T>, provided by the WaitCellExtension extension

A cell that awaits the Future held in this.
no setter
cellList → ValueCell<Iterable<ValueCell<T>>>

Available on ValueCell<List<T>>, provided by the ListCellExtension extension

Returns a cell which wraps the elements of the List held in this cell in ValueCells.
no setter
effectCell → ValueCell<T>

Available on ValueCell<T>, provided by the EffectCellExtension extension

Create a cell for observing side effects defined in this cell.
no setter
entries → ValueCell<Iterable<MapEntry<K, V>>>

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

Returns a cell which evaluates to Map.entries applied on the value in this cell.
no setter
equalityCellFactory → EqualityCellFactory
Return a factory for creating equality and inequality comparison cells.
no setterinherited
error → ValueCell

Available on ValueCell<Maybe<T>>, provided by the MaybeCellExtension extension

A cell which evaluates to the error of the Maybe.
no setter
first → ValueCell<T>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.first applied on the value in this cell.
no setter
hashCode → int
The hash code for this object.
no setteroverride
inDays → ValueCell<int>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

The duration in units of days, see Duration.inDays
no setter
inHours → ValueCell<int>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

The duration in units of hours, see Duration.inHours
no setter
inMicroseconds → ValueCell<int>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

The duration in units of microseconds, see Duration.inMicroseconds
no setter
inMilliseconds → ValueCell<int>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

The duration in units of milliseconds, see Duration.inMilliseconds
no setter
inMinutes → ValueCell<int>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

The duration in units of minutes, see Duration.inMinutes
no setter
inSeconds → ValueCell<int>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

The duration in units of seconds, see Duration.inSeconds
no setter
isCompleted → ValueCell<bool>

Available on FutureCell<T>, provided by the WaitCellExtension extension

A cell that is true when the Future in this has completed, false otherwise.
no setter
isEmpty → ValueCell<bool>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.isEmpty applied on the value in this cell.
no setter
isEmpty → ValueCell<bool>

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

Returns a cell which evaluates to Map.isEmpty applied on the value in this cell
no setter
isFinite → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

no setter
isInfinite → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

no setter
isNaN → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

no setter
isNegative → ValueCell<bool>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell, the value of which is true if this is negative, see Duration.isNegative.
no setter
isNotEmpty → ValueCell<bool>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.isNotEmpty applied on the value in this cell.
no setter
isNotEmpty → ValueCell<bool>

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

Returns a cell which evaluates to Map.isNotEmpty applied on the value in this cell
no setter
keys → ValueCell<Iterable<K>>

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

Returns a cell which evaluates to Map.keys applied on the value in this cell.
no setter
last → ValueCell<T>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.last applied on the value in this cell.
no setter
length → ValueCell<int>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.length applied on the value in this cell.
no setter
length → ValueCell<int>

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

Returns a cell which evaluates to Map.length applied on the value in this cell
no setter
notNull → ValueCell<T>

Available on ValueCell<T?>, provided by the NullCheckExtension extension

A cell that is guaranteed to hold a non-null value.
no setter
peek → ValueCell<T>

Available on ValueCell<T>, provided by the PeekCellExtension extension

Use the value of this without reacting to changes.
no setter
previous → ValueCell<T>

Available on ValueCell<T>, provided by the PrevValueCellExtension extension

Return a cell which holds the previous value of this cell.
no setter
reversed → ValueCell<Iterable<T>>

Available on ValueCell<List<T>>, provided by the ListCellExtension extension

Returns a cell which evaluates to List.reversed applied on the value in this cell.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
sign → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

no setter
single → ValueCell<T>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.single applied on the value in this cell.
no setter
unwrap → ValueCell

Available on ValueCell<Maybe<T>>, provided by the MaybeCellExtension extension

A cell which evaluates to the unwrapped value (by Maybe.unwrap) of the Maybe.
no setter
value → T
The cell's value
no setteroverride
values → ValueCell<Iterable<V>>

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

Returns a cell which evaluates to Map.values applied on the value in this cell.
no setter
wait → ValueCell<T>

Available on FutureCell<T>, provided by the WaitCellExtension extension

Return a cell that awaits the Future held in this.
no setter
waitLast → ValueCell<T>

Available on FutureCell<T>, provided by the WaitCellExtension extension

A cell that awaits the Future held in this.
no setter
whenReady → ValueCell<T>

Available on ValueCell<T>, provided by the ErrorCellExtension extension

Create a cell that evaluates to ValueCell.none() while the cell's value is uninitialized.
no setter

Methods

abs() → ValueCell<Duration>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell holding a Duration of the same length as this but positive, see Duration.abs.
abs() → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

addObserver(CellObserver observer) → void
Register an observer of the cell to be called when the cell's value changes.
override
and(ValueCell<bool> other) → ValueCell<bool>

Available on ValueCell<bool>, provided by the BoolCellExtension extension

Create a new cell which is the logical and of this and other.
apply<U>(U fn(T value), {dynamic key}) → ValueCell<U>

Available on ValueCell<T>, provided by the ComputeExtension extension

Create a new cell, with a value which is computed by applying a function on this cell's value
call() → T
Retrieve the value of the cell.
inherited
cast<R>() → ValueCell<Iterable<R>>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.cast<R>() applied on the value in this cell.
cast<R>() → ValueCell<List<R>>

Available on ValueCell<List<T>>, provided by the ListCellExtension extension

Returns a cell which evaluates to List.cast<R>() applied on the value in this cell.
chain(void action(), {dynamic key}) → ActionCell

Available on ValueCell<void>, provided by the ActionCellExtension extension

Create an action cell that is chained to this cell.
coalesce(ValueCell<T> ifNull) → ValueCell<T>

Available on ValueCell<T?>, provided by the NullCheckExtension extension

Replace null values in this cell with value of another cell.
contains(ValueCell elem) → ValueCell<bool>

Available on ValueCell<Set<T>>, provided by the SetCellExtension extension

Returns a cell that evaluates to true if the Set contains elem.
containsAll(ValueCell<Iterable> elems) → ValueCell<bool>

Available on ValueCell<Set<T>>, provided by the SetCellExtension extension

Returns a cell that evaluates to true if the Set contains elems.
containsKey(ValueCell key) → ValueCell<bool>

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

Returns a cell which evaluates to true if the Map held in this cell contains the key key.
containsValue(ValueCell val) → ValueCell<bool>

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

Returns a cell which evaluates to true if the Map held in this cell contains the value val.
delayed(Duration delay) → FutureCell<T>

Available on ValueCell<T>, provided by the DelayCellExtension extension

Create a cell which notifies its observers, for value changes in this, after a delay.
effect<T>(T fn(), {dynamic key}) → ValueCell<T>

Available on ValueCell<void>, provided by the ActionCellEffectExtension extension

Create a cell with a side effect that is run whenever this cell is triggered..
eq<U>(ValueCell<U> other) → ValueCell<bool>
Returns a new ValueCell which compares the value of this cell to another cell for equality.
inherited
error<E extends Object>({bool all = false}) → ValueCell<E?>

Available on ValueCell<T>, provided by the ErrorCellExtension extension

Create a cell which captures exceptions thrown during the computation of this cell.
hold() → CellHolder

Available on ValueCell, provided by the CellHolderExtension extension

Ensure that this cell is active.
initialValue(ValueCell<T> value) → ValueCell<T>

Available on ValueCell<T>, provided by the ErrorCellExtension extension

Returns a cell that evaluates to the value of value when the value of this is uninitialized.
loadingValue(ValueCell<T> value) → ValueCell<T>

Available on ValueCell<T>, provided by the ErrorCellExtension extension

Returns a cell that evaluates to the value of value while an async value is loading..
map<E>(E toElement(T e)) → ValueCell<Iterable<E>>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.map() applied on the value in this cell.
mapCells<E>(E fn(T e)) → ValueCell<Iterable<ValueCell<E>>>

Available on ValueCell<List<T>>, provided by the ListCellExtension extension

Apply a function on the value of every cell in cellList.
mutableApply<U>(U fn(T), void reverse(U), {dynamic key, bool changesOnly = false}) → MutableCell<U>

Available on ValueCell<T>, provided by the ComputeExtension extension

Create a new mutable cell, with a value that is a function of this cell's value.
neq<U>(ValueCell<U> other) → ValueCell<bool>
Returns a new ValueCell which compares the value of this cell to another cell for inequality.
inherited
nextValue() → Future<T>

Available on ValueCell<T>, provided by the ValueChangeExtension extension

Returns a Future that completes with the next value of this cell, when it is updated.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
not() → ValueCell<bool>

Available on ValueCell<bool>, provided by the BoolCellExtension extension

Create a new cell which is the logical not of this.
observe() → void
Track this cell as an argument of the current compute/watch function.
inherited
onError<E extends Object>(ValueCell<T> other) → ValueCell<T>

Available on ValueCell<T>, provided by the ErrorCellExtension extension

Create a cell which handles exceptions thrown while computing the value of this.
or(ValueCell<bool> other) → ValueCell<bool>

Available on ValueCell<bool>, provided by the BoolCellExtension extension

Create a new cell which is the logical or of this and other.
remainder(ValueCell<num> other) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

removeObserver(CellObserver observer) → void
Remove an observer that was previously registered with addObserver.
override
select<T>(ValueCell<T> ifTrue, [ValueCell<T>? ifFalse]) → ValueCell<T>

Available on ValueCell<bool>, provided by the BoolCellExtension extension

Create a new cell which selects between the values of two cells based on this.
store({bool changesOnly = false}) → StoreCell<T>

Available on ValueCell<T>, provided by the StoreCellExtension extension

Return a ValueCell which stores the value of this cell in memory.
toList() → ValueCell<List<T>>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.toList applied on the value in this cell.
toSet() → ValueCell<Set<T>>

Available on ValueCell<Iterable<T>>, provided by the IterableCellExtension extension

Returns a cell which evaluates to Iterable.toSet applied on the value in this cell.
toString() → String
A string representation of this object.
inherited
transform<U extends T>() → ValueCell<U>

Available on ValueCell<T>, provided by the TransformExtension extension

untilFalse() → Future<void>

Available on ValueCell<bool>, provided by the BoolValueChangeExtension extension

Returns a Future that completes when the value of this cell is false.
untilTrue() → Future<void>

Available on ValueCell<bool>, provided by the BoolValueChangeExtension extension

Returns a Future that completes when the value of this cell is true.
untilValue<U>(U value) → Future<void>

Available on ValueCell<T>, provided by the ValueChangeExtension extension

Returns a Future that completes when the value of this cell equals value.

Operators

operator %(ValueCell<num> other) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

operator *(ValueCell<num> factor) → ValueCell<Duration>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell which holds the multiplication of this by factor.
operator *(ValueCell<num> other) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

operator +(ValueCell<Duration> other) → ValueCell<Duration>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell which holds the sum of this and other.
operator +(ValueCell<num> other) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

operator -(ValueCell<Duration> other) → ValueCell<Duration>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell which holds the subtraction of other from this.
operator -(ValueCell<num> other) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

operator /(ValueCell<num> other) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

operator <(ValueCell<Duration> other) → ValueCell<bool>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell of which the value is true if this is less than other
operator <(ValueCell<num> other) → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

operator <=(ValueCell<Duration> other) → ValueCell<bool>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell of which the value is true if this is less than or equal to other
operator <=(ValueCell<num> other) → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

operator ==(Object other) → bool
The equality operator.
override
operator >(ValueCell<Duration> other) → ValueCell<bool>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell of which the value is true if this is greater than other
operator >(ValueCell<num> other) → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

operator >=(ValueCell<Duration> other) → ValueCell<bool>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell of which the value is true if this is greater than or equal to other
operator >=(ValueCell<num> other) → ValueCell<bool>

Available on ValueCell<num>, provided by the NumericExtension extension

operator [](ValueCell<int> index) → ValueCell<T>

Available on ValueCell<List<T>>, provided by the ListCellExtension extension

Returns a cell with a value equal to the element at index in the List held in this cell.
operator [](ValueCell key) → ValueCell<V?>

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

Returns a cell which evaluates to the value of the entry with key key.
operator unary-() → ValueCell<Duration>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell which holds the negation of this.
operator unary-() → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension

operator ~/(ValueCell<int> quotient) → ValueCell<Duration>

Available on ValueCell<Duration>, provided by the DurationCellExtension extension

Returns a cell which holds the division of this by quotient.
operator ~/(ValueCell<num> arg) → ValueCell<num>

Available on ValueCell<num>, provided by the NumericExtension extension