litho-core/com.facebook.litho/DerivedDynamicValue

DerivedDynamicValue

class DerivedDynamicValue<I, O>(dynamicValue: DynamicValue<I>, modifier: DerivedDynamicValue.Modifier<I, O>) : DynamicValue<O>

Allows a new DynamicValue to be derived from an existing DynamicValue, with modifications applied.

Parameters

The type held by the DynamicValue from which this is derived

Constructors

DerivedDynamicValue

constructor(dynamicValue: DynamicValue<I>, modifier: DerivedDynamicValue.Modifier<I, O>)

Types

fun interface Modifier<in I, out O>

Properties

numberOfListeners

val numberOfListeners: Int

Retrieves the amount of listeners attached to this DynamicValue.

Functions

fun attachListener(listener: DynamicValue.OnValueChangeListener<O>)

Register a callback to be invoked when the value changes.

fun detach(listener: DynamicValue.OnValueChangeListener<O>)

Remove a callback.

fun get(): O

Retrieves the current value.

fun set(value: O)

Sets current value and notifies all the attached listeners