StatefulCell<T> class
abstract
A cell with the state managed by a CellState object.
This class should be subclassed if you need to create a cell type that manages its own observers or stores its own value. The state of the cell, the observers and its value, should be stored in the CellState object rather than the StatefulCell. This is to allow multiple ValueCell objects with the same key to reference the same CellState, and hence share the same state.
NOTE:
The CellState only exists while it has at least one observer. If the CellState has no observers then effectively this cell has no state, it is inactive. Inactive cells should handle accesses to their values as gracefully as possible. For example an computed cell will simply recompute its value whenever it is accessed while it is inactive.
- Inheritance
- Implementers
- Available extensions
- ActionCellEffectExtension
- ActionCellExtension
- BoolCellExtension
- BoolValueChangeExtension
- CellHolderExtension
- ComputeArgumentsTracker
- ComputeExtension
- DelayCellExtension
- DurationCellExtension
- EffectCellExtension
- ErrorCellExtension
- IterableCellExtension
- ListCellExtension
- MapCellExtension
- MaybeCellExtension
- NullCheckExtension
- NumericExtension
- PeekCellExtension
- PrevValueCellExtension
- SetCellExtension
- StoreCellExtension
- TransformExtension
- ValueChangeExtension
- WaitCellExtension
Constructors
- StatefulCell({dynamic key})
-
Create a cell identified by
key.
Properties
- equalityCellFactory → EqualityCellFactory
-
Return a factory for creating equality and inequality comparison cells.
no setterinherited
- hashCode → int
-
The hash code for this object.
no setteroverride
- hasState → bool
-
Does this cell have a state?
no setter
- key ↔ dynamic
-
Key which uniquely identifies the cell
latefinal
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
state
→ CellState<
StatefulCell> ? -
The current state of the cell, or null if the cell is inactive.
no setter
- value → T
-
The cell's value
no setterinherited
Methods
-
addObserver(
CellObserver observer) → void -
Register an observer of the cell to be called when the cell's value changes.
override
-
call(
) → T -
Retrieve the value of the cell.
inherited
-
createState(
) → CellState< StatefulCell> - Create the CellState for this cell.
-
eq<
U> (ValueCell< U> other) → ValueCell<bool> -
Returns a new ValueCell which compares the value of this cell to another cell for equality.
inherited
-
neq<
U> (ValueCell< U> other) → ValueCell<bool> -
Returns a new ValueCell which compares the value of this cell to another cell for inequality.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
observe(
) → void -
Track this cell as an argument of the current compute/watch function.
inherited
-
removeObserver(
CellObserver observer) → void -
Remove an observer that was previously registered with addObserver.
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
override