CODEWITHSUNDEEP
scalaeventsjavafxscalafx
ZbyszekKr
ZbyszekKr

Reputation: 512

Notifying ObservableBuffer listeners on content's member change

I have an ObservableBuffer[T] that contains a number of elements and ComboBox[T] which displays these elements most likely using it's toString() method.

Class T (for now let's assume it is mutable) has a name field which is changed during execution of the program.

However (obviously) this doesn't trigger the ComboBox's reloading of the elements and that's a requirement.

Only way around this, that I found is through immutability - deleting the given element from the collection and adding the updated one:

/* Context */
val items: ObservableBuffer[T]
val beforeChange: T

val afterChange: T = beforeChange.changed
items -= beforeChange
items += afterChange

This solution works and immutability is always a good thing so I might go ahead with it, but still curious whether this approach is the only viable way.

Upvotes: 0

Views: 198

Answers (1)

Jarek
Jarek

Reputation: 1533

If you can't use immutable items, you could try to construct an observable list using javafx.collections.FXCollections.observableList(List list, Callback extractor). Then use the extractor to notify about the changes to mutable elements. See also Combobox refresh value and listview when object content change.

Upvotes: 1

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