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63 lines
1.5 KiB
63 lines
1.5 KiB
package nova.monadic_sfx.util
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import scalafx.beans.property.ObjectProperty
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import scalafx.beans.property.ReadOnlyObjectProperty
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import scalafx.beans.value.ObservableValue
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object Misc {
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implicit final class MyRichObservable[A, C](val self: ObservableValue[A, C])
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extends AnyVal {
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def filter(f: A => Boolean): ReadOnlyObjectProperty[A] =
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Method.filter(self)(f)
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def filterNull: ReadOnlyObjectProperty[A] = Method.filterNull(self)
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}
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}
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object Method {
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type Observable[A] = ObservableValue[A, _]
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def filter[B](
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a: Observable[B]
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)(f: B => Boolean): ReadOnlyObjectProperty[B] = {
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val prop = ObjectProperty[B](a.value)
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def changeHandler() =
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prop.synchronized {
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if (f(a.value)) {
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prop.value = a.value
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}
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}
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a onChange changeHandler()
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prop
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}
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/**
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* Simply creates a new observable that mirrors the source observable but
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* doesn't emit null values. JavaFX likes to work with null values in scene
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* nodes/properties (shrugs) and observables by default emit null values
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* that can cause crashes. ScalaFX does not offer any *fixes* for this
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*
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* @param a
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* @return
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*/
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def filterNull[B](
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a: Observable[B]
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): ReadOnlyObjectProperty[B] = {
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val prop = ObjectProperty[B](a.value)
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def changeHandler() =
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prop.synchronized {
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if (a.value != null) {
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prop.value = a.value
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}
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}
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a onChange changeHandler()
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prop
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}
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}
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