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