On Wed, 15 Oct 2025 03:40:24 GMT, John Hendrikx <[email protected]> wrote:
> This PR implements a new default method on `ObservableList` to be able to > replace elements within a specified range. > > Justification for this change is to allow an `ObservableList` to be bulk > modified resulting in a single `ListChangeListener` call back. In this way > the callbacks don't observe the list changing its size from S to S-X back to > S again(*). Currently the only way to bulk replace a range of items is to > remove X items then add X items, resulting in two listener callbacks in > between which the size of the list can be observed to change. > > The other alternative is to call `set` individually for each item, which > results in many change notifications. > > With the addition of this PR, and the changes in > `ModifiableObservableListBase`, replacing a range of items becomes a single > change callback. > > (*) The list may indeed change size still as plain `List` does not have > `setAll` operations; size listeners may observe this, but it will no longer > be observable from a `ListChangeListener` due to multiple separate callbacks. This pull request has now been integrated. Changeset: b76090df Author: John Hendrikx <[email protected]> URL: https://git.openjdk.org/jfx/commit/b76090dfe6821efcbd86230e1b24ad7f455c7a41 Stats: 135 lines in 3 files changed: 134 ins; 1 del; 0 mod 8091429: ObservableList<E>#replaceRange(int from, int to, Collection<? extends E> col) Reviewed-by: mstrauss, kcr ------------- PR: https://git.openjdk.org/jfx/pull/1937
