Is there any hook to detect whether the player is breaking or more accurately hitting a block? The boolean in PlayerControllerMP is set to private and I need it for a custom tool animation.

Just an idea here,

Make a class that extends PlayerControllerMP and copy the part you need and make it public.

If you know what Reflection is you can do this easily. (In these examples I use a custom class I made called 'ReflectionManager', so you'll need to make your own to get these values)

 

Clientside Proxy:

public ChunkCoordinates getPlayerBreakingBlockCoords(EntityPlayer entityplayer)
{
	int blockX = 0;
	int blockY = 0;
	int blockZ = 0;
	if(entityplayer instanceof EntityClientPlayerMP)
	{
		PlayerControllerMP controller = Minecraft.getMinecraft().playerController;
		boolean hasBlock = ReflectionManager.getPrivateBoolean(controller, "isHittingBlock", PlayerControllerMP.class);
		if(hasBlock)
		{
			blockX = ReflectionManager.getPrivateInt(controller, "currentBlockX", PlayerControllerMP.class);
			blockY = ReflectionManager.getPrivateInt(controller, "currentBlockY", PlayerControllerMP.class);
			blockZ = ReflectionManager.getPrivateInt(controller, "currentBlockZ", PlayerControllerMP.class);
			return new ChunkCoordinates(blockX, blockY, blockZ);
		}
	}else
	{
		return super.getPlayerBreakingBlockCoords(entityplayer);
	}
	return null;
}

 

Serverside Proxy:

public ChunkCoordinates getPlayerBreakingBlockCoords(EntityPlayer entityplayer)
{
	int blockX = 0;
	int blockY = 0;
	int blockZ = 0;
	if(entityplayer instanceof EntityPlayerMP)
	{
		ItemInWorldManager manager = ((EntityPlayerMP)(entityplayer)).theItemInWorldManager;
		boolean hasBlock = ReflectionManager.getPrivateBoolean(manager, "isDestroyingBlock", ItemInWorldManager.class);
		if(hasBlock)
		{
			blockX = ReflectionManager.getPrivateInt(manager, "partiallyDestroyedBlockX", ItemInWorldManager.class);
			blockY = ReflectionManager.getPrivateInt(manager, "partiallyDestroyedBlockY", ItemInWorldManager.class);
			blockZ = ReflectionManager.getPrivateInt(manager, "partiallyDestroyedBlockZ", ItemInWorldManager.class);
			return new ChunkCoordinates(blockX, blockY, blockZ);
		}
	}
	return null;
}

 

As with all reflection this comes with a performance cost if you use it constantly. Also note that here I use the actual names; When you go to reobfuscate you need to replace the names with the obfuscated names or this won't work.