Change

Trait that indicates a Change in an ObservableBuffer. It is a simpler version of JavaFX's ListChangeListener.Change, where each subclass indicates a specific change operation. Unlike JavaFX, all subclasses are exclusive to each other. This enables using pattern matching:

items.onChange((_, changes) => {
  for (change <- changes)
    change match {
      case Add(pos, added)                => ...
      case Remove(pos, removed)           => ...
      case Reorder(from, to, permutation) => ...
      case Update(pos, updated)           => ...
    }
})

"replace" is represented as two changes Remove and Add.