Structure and Feature placement callbacks

[octylFractal]

Major SpongeAPI version

12

Is this likely to be a breaking change?

No

What are you requesting?

Currently, Structure and Feature have boolean place(ServerWorld, Vector3i), which does not allow a mod like WorldEdit to capture or modify the changes. It would be nice if we could get a callback for each block/entity so that WorldEdit may place it, rather than placing it directly into the world. This allows undo, masking, and better control of block placement than using Minecraft's code directly.

[Yeregorix]

I think the proper way to do it would be:

try (CauseStackManager.StackFrame frame = Sponge.server().causeStackManager().pushCauseFrame()) {
  frame.addContext(MY_CONTEXT_KEY, "hello");
  Features.TREES_PLAINS.get().place(location);
}

and

@Listener
public void onBlockChange(ChangeBlockEvent e) {
  if (e.context().get(MY_CONTEXT_KEY).isPresent()) {
    // filter blocks
  }
}

However I tested that a few days ago and it didn't work so there is likely a bug in the implementation currently.
The implementation needs to be fixed, but I don't think the API needs any additions for that.