glok-model/uk.co.nickthecoder.glok.collections/ObservableListSize

ObservableListSize

class ObservableListSize(val list: ObservableList<*>) : ObservableValueBase<Int> , ObservableInt

An ObservableInt whose value is the size of an ObservableList.

As example of where this might be useful. Suppose we want to disable a button when a list is empty. Simply bind its disabledProperty to :

ObservableListSize(list).equalTo(0)

Alternatively, we might want a label to contain a list's size, in which case, bind its textProperty to :

ObservableListSize(list).toObservableString()

See also, the extension functions sizeProperty, isEmptyProperty, isNotEmptyProperty

Constructors

ObservableListSize

constructor(list: ObservableList<*>)

Properties

val list: ObservableList<*>

open override val value: Int

Functions

addBindChangeListener

open fun addBindChangeListener(lambda: (ObservableValue<Int>, Int, Int) -> Unit): ChangeListener<Int, ObservableValue<Int>>

abstract fun addBindChangeListener(listener: ChangeListener<Int, ObservableValue<Int>>)

Identical to addChangeListener, but these listeners are guaranteed to fire BEFORE other listeners. These should be used for the sole purpose of updating single ObservableValues which are dependent on this ObservableValue. This helps (but doesn't guarantee) that properties change atomically. i.e. when one property changes, a related property also changes before other (regular) listeners fire. Therefore, the (regular) listeners cannot read inconsistent values.

addBindListener

open fun addBindListener(lambda: (Observable) -> Unit): InvalidationListener

abstract fun addBindListener(listener: InvalidationListener)

Identical to addListener, but these listeners are guaranteed to fire BEFORE regular listeners. These should be used for the sole purpose of updating other ObservableValues which are dependent on this Observable.

addChangeListener

open fun addChangeListener(lambda: (ObservableValue<Int>, Int, Int) -> Unit): ChangeListener<Int, ObservableValue<Int>>

abstract fun addChangeListener(listener: ChangeListener<Int, ObservableValue<Int>>)

open fun addListener(lambda: (Observable) -> Unit): InvalidationListener

abstract fun addListener(listener: InvalidationListener)

addWeakChangeListener

open fun addWeakChangeListener(lambda: (ObservableValue<Int>, Int, Int) -> Unit): ChangeListener<Int, ObservableValue<Int>>

addWeakListener

open fun addWeakListener(lambda: (Observable) -> Unit): InvalidationListener

fun <T : Any> ObservableValue<T>.asNullable(): ObservableValue<T?>

Converts an ObservableValue, with a non-nullable to value, to an ObservableValue whose value IS nullable.

operator fun ObservableInt.div(constant: Int): ObservableInt

operator fun ObservableInt.div(other: ObservableInt): ObservableInt

open fun equalTo(other: Int): ObservableBoolean

open fun equalTo(other: ObservableValue<Int>): ObservableBoolean

open operator fun getValue(thisRef: Any, kProperty: KProperty<*>): Int

Lets us declare a val using a for the value of this property, using this as a delegate. e.g.

fun ObservableInt.greaterThan(value: Int): BooleanUnaryFunction<Int, ObservableInt>

fun ObservableInt.greaterThan(other: ObservableInt): BooleanBinaryFunction<Int, ObservableInt, Int, ObservableInt>

greaterThanOrEqual

fun ObservableInt.greaterThanOrEqual(value: Int): BooleanUnaryFunction<Int, ObservableInt>

fun ObservableInt.greaterThanOrEqual(other: ObservableInt): BooleanBinaryFunction<Int, ObservableInt, Int, ObservableInt>

open fun isNotNull(): ObservableBoolean

open fun isNull(): ObservableBoolean

fun ObservableInt.lessThan(value: Int): BooleanUnaryFunction<Int, ObservableInt>

fun ObservableInt.lessThan(other: ObservableInt): BooleanBinaryFunction<Int, ObservableInt, Int, ObservableInt>

lessThanOrEqual

fun ObservableInt.lessThanOrEqual(value: Int): BooleanUnaryFunction<Int, ObservableInt>

fun ObservableInt.lessThanOrEqual(other: ObservableInt): BooleanBinaryFunction<Int, ObservableInt, Int, ObservableInt>

operator fun ObservableInt.minus(constant: Int): ObservableInt

operator fun ObservableInt.minus(other: ObservableInt): ObservableInt

open fun notEqualTo(other: Int): ObservableBoolean

open fun notEqualTo(other: ObservableValue<Int>): ObservableBoolean

notSameInstance

open fun notSameInstance(other: Int): ObservableBoolean

open fun notSameInstance(other: ObservableValue<Int>): ObservableBoolean

operator fun ObservableInt.plus(constant: Int): ObservableInt

operator fun ObservableInt.plus(other: ObservableInt): ObservableInt

operator fun ObservableInt.rem(constant: Int): ObservableInt

operator fun ObservableInt.rem(other: ObservableInt): ObservableInt

removeChangeListener

abstract fun removeChangeListener(listener: ChangeListener<Int, ObservableValue<Int>>)

abstract fun removeListener(listener: InvalidationListener)

replaceNullWith

fun <T : Any> ObservableValue<T?>.replaceNullWith(defaultValue: T): ObservableValue<T>

Converts an ObservableValue, with a nullable to value, to an ObservableValue whose value is NOT nullable, by supplying a defaultValue.

open fun sameInstance(other: Int): ObservableBoolean

open fun sameInstance(other: ObservableValue<Int>): ObservableBoolean

operator fun ObservableInt.times(constant: Int): ObservableInt

operator fun ObservableInt.times(other: ObservableInt): ObservableInt

fun ObservableInt.toDouble(): ObservableDouble

fun ObservableInt.toFloat(): ObservableFloat

toObservableString

open fun toObservableString(): ObservableString

open fun toObservableString(nullString: String): ObservableString

operator fun ObservableInt.unaryMinus(): ObservableInt