Check to see if the player can start using the Releasable item. (#4532)

src/item/Bow.php

@@ -123,4 +123,8 @@ class Bow extends Tool implements Releasable{
 
 		return ItemUseResult::SUCCESS();
 	}
+
+	public function canStartUsingItem(Player $player) : bool{
+		return !$player->hasFiniteResources() || $player->getOffHandInventory()->contains($arrow = VanillaItems::ARROW()) || $player->getInventory()->contains($arrow);
+	}
 }

src/item/Food.php

@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\item;
 
 use pocketmine\entity\Living;
+use pocketmine\player\Player;
 
 abstract class Food extends Item implements FoodSourceItem{
 	public function requiresHunger() : bool{
@@ -41,4 +42,8 @@ abstract class Food extends Item implements FoodSourceItem{
 	public function onConsume(Living $consumer) : void{
 
 	}
+
+	public function canStartUsingItem(Player $player) : bool{
+		return !$this->requiresHunger() || $player->getHungerManager()->isHungry();
+	}
 }

src/item/MilkBucket.php

@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\item;
 
 use pocketmine\entity\Living;
+use pocketmine\player\Player;
 
 class MilkBucket extends Item implements ConsumableItem{
 
@@ -42,4 +43,8 @@ class MilkBucket extends Item implements ConsumableItem{
 	public function onConsume(Living $consumer) : void{
 		$consumer->getEffects()->clear();
 	}
+
+	public function canStartUsingItem(Player $player) : bool{
+		return true;
+	}
 }

src/item/Potion.php

@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\item;
 
 use pocketmine\entity\Living;
+use pocketmine\player\Player;
 
 class Potion extends Item implements ConsumableItem{
 
@@ -52,4 +53,8 @@ class Potion extends Item implements ConsumableItem{
 	public function getResidue() : Item{
 		return VanillaItems::GLASS_BOTTLE();
 	}
+
+	public function canStartUsingItem(Player $player) : bool{
+		return true;
+	}
 }

src/item/Releasable.php

@@ -23,9 +23,13 @@ declare(strict_types=1);
 
 namespace pocketmine\item;
 
+use pocketmine\player\Player;
+
 /**
  * Interface implemented by objects that can be used.
  */
 interface Releasable{
 
+	public function canStartUsingItem(Player $player) : bool;
+
 }