Event system

Creating events:

Creating an event class:


import cn.nukkit.event.Event;
 
public class CustomDataEvent extends Event {
 
    private String data;
 
    public CustomDataEvent(String data) {
        this.data = data;
    }
 
    public String getData() {
        return this.data;
    }
 
    public void setData(String data) {
        this.data = data;
    }
}

Creating a cancellable event:


import cn.nukkit.event.Event;
import cn.nukkit.event.Cancellable;
 
public class CustomCancellableEvent extends Event implements Cancellable {
 
    // todo
}

Calling events:

Calling an event:


event.call(); // returns false if the event was canceled.

Calling an event on another EventBus:


event.call(myEventBus);

Removal of HandlerList

In version 1.6.0, the HandlerList class was marked as deprecated and is no longer required in event classes.

Before:


package cn.nukkit.event.player;
 
import cn.nukkit.Player;
import cn.nukkit.event.HandlerList;
 
public class PlayerJumpEvent extends PlayerEvent {
 
    private static final HandlerList handlers = new HandlerList();
 
    public static HandlerList getHandlers() {
        return handlers;
    }
 
    public PlayerJumpEvent(Player player) {
        this.player = player;
    }
}

After:


package cn.nukkit.event.player;
 
import cn.nukkit.Player;
 
public class PlayerJumpEvent extends PlayerEvent {
 
    public PlayerJumpEvent(Player player) {
        this.player = player;
    }
}