From MCreator 1.7.9 on, event system was replaced with Procedure system. On this page, you can find the basics of the procedure system.
Creating new procedure
To create and define a new procedure, create a new mod element and give it a name. For the element type, select procedure. After you click OK, procedure editor will open. Here you can define your procedure. Start block is placed on the panel by default. You need to attach all other blocks to this blocks to define a procedure. The procedure will "flow" from the top to the bottom unless you use loop blocks.
Procedure block flow can be activated using external triggers and/or with global events. You can define the global trigger in the start block selector.
To trigger procedure from the external event, create a new mod element (for instance a block) and attach the procedure to the trigger (for instance on block right-clicked). Each procedure has its set of dependencies that are shown in the procedure creator window. Only procedures that require dependencies provided by the trigger are shown in the drop-down procedure selector.
If your procedure does world modifications and depends on the world reference, it can not be called from the trigger that does not hold the Minecraft world reference.
On the animation above, you can see the procedure selection in action. Used dependencies are shown as highlighted colors. In this case, the procedure named "Procedure" was selected to be triggered (executed) when the player right clicks in the air with the provided item.
Basic procedure examples
Below, you can find some basic examples of how to use procedure system that should help you get started with your custom procedures.
In this example, we show how to create an if the condition that triggers in 70% of the cases. In case it is triggered, the block at x, y, z (these coordinates depend on the trigger that provides actual coordinate values) is removed.
Check for a block below
This example checks for the block that is 1 block under the provided location. The check ignores metadata as a = operator is used. In case of strict metadata check use == block compare block.
Dig down 5 blocks including itself
In this example, we create a global variable called level. It is increased 5 times, starting from 0. This procedure removes the block at given x,y,z coordinates and then removes 4 blocks below it in proper order.
Send message when a certain amount of items in slot
In this example, we see how to check for the number of items that a block at x,y,z contains in its inventory. If there is a block without inventory or no block at all at this location, zero number is returned. If the block contains a number divisible by 5 of blocks, a message is sent to all players when the trigger triggers this procedure.
Emit redstone power when the block sees the sky
In this example, we show how to make the provided block emit the redstone power if the block at the given coordinates can see the sky (no blocks obstruct the view to the sky).