kotlin-stdlib / kotlin.properties / ObservableProperty

ObservableProperty

Common
JVM
JS
Native
1.0
abstract class ObservableProperty<T> : 
    ReadWriteProperty<Any?, T>

Implements the core logic of a property delegate for a read/write property that calls callback functions when changed.

Parameters

initialValue - the initial value of the property.

Constructors

Common
JVM
JS
Native
1.0

<init>

Implements the core logic of a property delegate for a read/write property that calls callback functions when changed.

ObservableProperty(initialValue: T)

Functions

Common
JVM
JS
Native
1.0

afterChange

The callback which is called after the change of the property is made. The value of the property has already been changed when this callback is invoked.

open fun afterChange(
    property: KProperty<*>,
    oldValue: T,
    newValue: T)
Common
JVM
JS
Native
1.0

beforeChange

The callback which is called before a change to the property value is attempted. The value of the property hasn't been changed yet, when this callback is invoked. If the callback returns true the value of the property is being set to the new value, and if the callback returns false the new value is discarded and the property remains its old value.

open fun beforeChange(
    property: KProperty<*>,
    oldValue: T,
    newValue: T
): Boolean
Common
JVM
JS
Native
1.0

getValue

Returns the value of the property for the given object.

open fun getValue(thisRef: Any?, property: KProperty<*>): T
Common
JVM
JS
Native
1.0

setValue

Sets the value of the property for the given object.

open fun setValue(
    thisRef: Any?,
    property: KProperty<*>,
    value: T)