This is probably obvious but i'm missing it.  I want to cancel all things to do with buckets under certain conditions.

 

I see the bucketfill event.

 

What I can't figure out is the empty bucket event and I don't see anything searching.

 

Could someone point me in the right direction?

Use the PlayerInteractEvent and check if the item held by the player is a bucket. It's the closest you can get.

I'll have to play around with that tonight.  That was the event I started with, but I must have done something wrong.

I figured out the problem.  This was very wierd and maybe it will help others.

 

What I am doing when the PlayerInteractEvent fires is to look for where the block that was impacted is at and determine if it is in a certain region.

 

It worked great for placing blocks, setting things on fire, ect.  It doesn't work for buckets though.

 

Then I noticed when you right click with a bucket, the PlayerInteractEvent fires twice.  The first time, the location is good.  The second time x/y/z are all ZERO!  The first one cancels correctly but doesn't stop the fluid drop dropping or picking up.  The 2nd one is the one that has to be cancelled.

 

To fix this, I looked for the type of click to be right click air and I substitue in the players x/y/z instead of the blocks.  This works great.

 

I wouldn't have kept looking at this without SanAndreasP' pointer to spur me back to that being the right event.  Thanks.

The second time. where all the coords are 0, that time it's the client version. The server version is the time where the coords are correct. so you may need to check if !world.isRemote.

I can understand why you would think it is the client.  I did at first.  It isn't.  I tested it.

 

It is on the Server Tab of the debug and it returns from testing that it is the server.

I can understand why you would think it is the client.  I did at first.  It isn't.  I tested it.

 

It is on the Server Tab of the debug and it returns from testing that it is the server.

 

The call with the 0's in there is probably the action type RIGHT_CLICK_AIR, which is used when an item should be used. Just check for the

event.action == PlayerInteractEvent.Action.RIGHT_CLICK_AIR

You could always add your own Bucket "un-fill" Event into Forge if you really wanted to. They might approve your addition sometime in the future, who knows? But the InteractEvent is probably your best shot.

As mentioned above it works so I don't think we need a new event.  Just have to deal with it firing that 2nd time and realizing it the bucket.