Delegates

Common
JVM
JS
Native
1.0
object Delegates
(source)

Standard property delegates.

Functions

Common
JVM
JS
Native
1.0

notNull

Returns a property delegate for a read/write property with a non- null value that is initialized not during object construction time but at a later time. Trying to read the property before the initial value has been assigned results in an exception.

fun < T : Any > notNull ( ) : ReadWriteProperty < Any ? , T >
Common
JVM
JS
Native
1.0

observable

Returns a property delegate for a read/write property that calls a specified callback function when changed.

fun < T > observable (
initialValue : T ,
onChange : ( property : KProperty < * > , oldValue : T , newValue : T ) -> Unit
) : ReadWriteProperty < Any ? , T >
Common
JVM
JS
Native
1.0

vetoable

Returns a property delegate for a read/write property that calls a specified callback function when changed, allowing the callback to veto the modification.

fun < T > vetoable (
initialValue : T ,
onChange : ( property : KProperty < * > , oldValue : T , newValue : T ) -> Boolean
) : ReadWriteProperty < Any ? , T >