KVal

open class KVal<T>(value: T) : AutoCloseable(source)

A KVal is a read-only observable container for a value of type T. These are typically created by KVal.map or KVar.map, but can also be created directly.

Inheritors

KVar

Constructors

KVal

constructor(value: T)

Properties

value

open val value: T

The current value of this KVal, this can be read but not modified - but it may change if this KVal was created by mapping another KVal or using KVal.map. If you want to modify this value then you should be using a KVar instead.

Functions

addListener

fun addListener(listener: (T, T) -> Unit): Long

Add a listener to this KVar. The listener will be called whenever the value property changes.

open override fun close()

fun close(reason: CloseReason)

Close this KVal, and notify all handlers that it has been closed.

map

fun <O> map(mapper: (T) -> O): KVal<O>

Create another KVal that is a mapping of this KVal. The mapping function will be called whenever this KVal changes, and the new KVal will be updated with the result of the mapping function.

onClose

fun onClose(handler: () -> Unit)

Add a handler to be called when this KVal is closed.

plus

operator fun <O : Any> KVal<List<O>>.plus(other: KVal<List<O>>): KVal<List<O>>

removeListener

fun removeListener(handle: Long)

Remove a listener from this KVar. The listener will no longer be called when the value property changes.

subList

fun <T : Any> KVal<List<T>>.subList(fromIx: Int, toIx: Int): KVal<List<T>>

toString

open override fun toString(): String