Aggregation of Properties when Binding

[Peter Jones]

Hi all,

In my example, I have a collection of objects which have a BooleanProperty and another single BooleanProperty.  I want to bind the value of the single property to the collection members' BooleanProperty, using a logical OR operator.  The purpose is to have any observer of the single value notified of the change in any of the collection.

I can do

changed <== _pads(0).changed || _pads(1).changed

where  changed is the single BooleanProperty I want to bind and  _pads is the collection.

What I can't work out is how to have all the collection members OR'd using an collection operator such as map() or reduce().

Can anyone give me some direction?

Thanks!

-- Peter

[Jarek Sacha]

See answers here: https://github.com/scalafx/scalafx/discussions/375#discussioncomment-8750971

  val e = BooleanProperty(false)
  val f = BooleanProperty(false)
  val g = BooleanProperty(false)
  val x = BooleanProperty(false)

  val bools = Seq(e, f, g)
  // Since will will be folding on OR, we will start with FALSE initial binding
  val dummyBinding = BooleanProperty(false) && BooleanProperty(false)
  x <== bools.fold(dummyBinding)(_ || _)

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