How do set it up to where an item gives an effect while in hand or on the player

So i am working on a plugin that needs to detect whether a player is holding an item or wearing it...

 

Task

 

PlayerItemHeldEvent.

You can save the player's previous effects in an array and then do checks whenever the event gets called.

WARNING:
I'm not sure if this event gets called when the held item is moved to cursor inventory. If it doesn't get called, the player can be stuck with an infinite effect. But you can verify that fact... maybe?
Confirmed, it works with every transaction. It's the best option to use in your case.

PHP:

/** @var int[] */
private $enchantFx = [];

public function onItemHold(PlayerItemHeldEvent $event) : void{
    $item = $event->getItem();
    $player = $event->getPlayer();
    if(isset($this->enchantFx[$id = $player->getId()])){//remove effects if any
        foreach($this->enchantFx[$id] as $effectId){
            $player->removeEffect($effectId);
        }
        unset($this->enchantFx[$id]);
    }
    if($item->hasEnchantment(Enchantment::SHARPNESS)){
        $effect = Effect::getEffect(Effect::HASTE)->setDuration(INT32_MAX);
        if($player->addEffect($effect)){
            $this->enchantFx[$id][] = $effect->getId();
        }else{
            //unsuccessful attempt to give player an effect, probably because they already have the same effect with a better level of amplifier
        }
    }
}


 

Clearly isn't, since you must be holding the item for the PlayerItemHeldEvent to be fired.

 

You can listen to the EntityArmorChangeEvent
Source: https://forums.pmmp.io/threads/wearing-item.4836/

Other reference:

PHP:

Player->getInventory()->
getHelmet() # or
getChestplate() # or
getLeggings() # or
getBoots()

returns an Item object.

 

That's the whole point, read the thread once again.