I'd like some advice on how to do this: I want to allow the player to break a block, drop some items, and then immediately replace the block with a new block. I've seen at least one mod that does this, Draco's Reasonable Realism, but can't piece together the code (I only have experience with modding for 1.8.9). I've been searching for ages but haven't come up with anything helpful.

 

I have been successful at using events for other things, like using HarvestDropsEvent to change vanilla drops and BreakEvent to cancel breaks, but neither of those seems right for what I want to do this time. Any help you can give would be appreciated.

If it's your own Block class, all you need do is override #breakBlock and have it replace itself at that time.

 

If it's not your own block, then you could probably re-place the block from HarvestDropsEvent, though I don't recall if you have access to the BlockPos or state at that point. There are some other events that deal with blocks that you can look into - use your IDE to browse the events at your disposal.

If it's your own Block class, all you need do is override #breakBlock and have it replace itself at that time.

 

If it's not your own block, then you could probably re-place the block from HarvestDropsEvent, though I don't recall if you have access to the BlockPos or state at that point. There are some other events that deal with blocks that you can look into - use your IDE to browse the events at your disposal.

 

Damn, beat me to it by 10 seconds 

It's not my block. I've already looked through the available events and considered using HarvestDropsEvent but it didn't seem right. I just looked again and noticed that HarvestDropsEvent has BlockPos and IBlockState as parameters. What would I do to actually place the block?

Does the event also have a World object? If so, something like:

e.worldObj.setBlockState(e.pos, e.state); // parameter order and types may not be 100% correct

Woo-hoo! It worked! Many thanks!

I've seen at least one mod that does this, Draco's Reasonable Realism, but can't piece together the code (I only have experience with modding for 1.8.9). I've been searching for ages but haven't come up with anything helpful.

 

Also doesn't help that its my own block doing it.