Hi, java.util.List doesn't support a swap operation but there is Collections.swap(List, int, int) <https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#swap-java.util.List-int-int->for that.
Also there exists a JIRA RT-39128 <https://javafx-jira.kenai.com/browse/RT-39128> for getting swap support on ObservableList. Regards, Anirvan On 1 December 2014 at 23:35, Werner Lehmann <lehm...@media-interactive.de> wrote: > Hi, > > occasionally I need to move a child in its children list and would like to > avoid a remove/add operation. For example, this could be useful to change > z-order in a StackPane, or change vertical order on a VBox, or when > synchronizing item order in a model with corresponding node order in a skin. > > java.util.List does not support a move or swap operation. I had hoped a > sort operation with a clever comparator might do the trick, triggering a > permutation listchange event. However, any attempt in this direction bombs, > complaining about "duplicate children added". On the other hand there is > rudimentary support for this in Node.toFront and flags exist on Parent: > "childrenTriggerPermutation", "childSetModified". > > Any thoughts about getting swap support on ObservableList and/or > permutation support on Parent.children? > > Werner > -- Anirvan
