Close block windows when player is too far away

src/block/inventory/AnvilInventory.php

@@ -27,8 +27,9 @@
 use pocketmine\inventory\TemporaryInventory;
 use pocketmine\world\Position;
 
-class AnvilInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
+class AnvilInventory extends SimpleInventory implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public const SLOT_INPUT = 0;
 	public const SLOT_MATERIAL = 1;

src/block/inventory/BarrelInventory.php

@@ -30,8 +30,9 @@
 use pocketmine\world\sound\BarrelOpenSound;
 use pocketmine\world\sound\Sound;
 
-class BarrelInventory extends SimpleInventory implements BlockInventory{
+class BarrelInventory extends SimpleInventory implements BlockInventory, ProximityRestricted{
 	use AnimatedBlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder){
 		$this->holder = $holder;

src/block/inventory/BrewingStandInventory.php

@@ -26,8 +26,9 @@
 use pocketmine\inventory\SimpleInventory;
 use pocketmine\world\Position;
 
-class BrewingStandInventory extends SimpleInventory implements BlockInventory{
+class BrewingStandInventory extends SimpleInventory implements BlockInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public const SLOT_INGREDIENT = 0;
 	public const SLOT_BOTTLE_LEFT = 1;

src/block/inventory/CartographyTableInventory.php

@@ -27,8 +27,9 @@
 use pocketmine\inventory\TemporaryInventory;
 use pocketmine\world\Position;
 
-final class CartographyTableInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
+final class CartographyTableInventory extends SimpleInventory implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder){
 		$this->holder = $holder;

src/block/inventory/ChestInventory.php

@@ -31,8 +31,9 @@
 use pocketmine\world\sound\ChestOpenSound;
 use pocketmine\world\sound\Sound;
 
-class ChestInventory extends SimpleInventory implements BlockInventory{
+class ChestInventory extends SimpleInventory implements BlockInventory, ProximityRestricted{
 	use AnimatedBlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder){
 		$this->holder = $holder;

src/block/inventory/CraftingTableInventory.php

@@ -27,8 +27,9 @@
 use pocketmine\inventory\TemporaryInventory;
 use pocketmine\world\Position;
 
-final class CraftingTableInventory extends CraftingGrid implements BlockInventory, TemporaryInventory{
+final class CraftingTableInventory extends CraftingGrid implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder){
 		$this->holder = $holder;

src/block/inventory/DoubleChestInventory.php

@@ -30,8 +30,9 @@
 use pocketmine\world\sound\ChestOpenSound;
 use pocketmine\world\sound\Sound;
 
-class DoubleChestInventory extends BaseInventory implements BlockInventory, InventoryHolder{
+class DoubleChestInventory extends BaseInventory implements BlockInventory, InventoryHolder, ProximityRestricted{
 	use AnimatedBlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(
 		private ChestInventory $left,

src/block/inventory/EnchantInventory.php

@@ -33,8 +33,9 @@
 use function array_values;
 use function count;
 
-class EnchantInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
+class EnchantInventory extends SimpleInventory implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public const SLOT_INPUT = 0;
 	public const SLOT_LAPIS = 1;

src/block/inventory/EnderChestInventory.php

@@ -38,10 +38,11 @@
 /**
  * EnderChestInventory is not a real inventory; it's just a gateway to the player's ender inventory.
  */
-class EnderChestInventory extends DelegateInventory implements BlockInventory{
+class EnderChestInventory extends DelegateInventory implements BlockInventory, ProximityRestricted{
 	use AnimatedBlockInventoryTrait {
 		onClose as animatedBlockInventoryTrait_onClose;
 	}
+	use ProximityRestrictedTrait;
 
 	public function __construct(
 		Position $holder,

src/block/inventory/FurnaceInventory.php

@@ -28,8 +28,9 @@
 use pocketmine\item\Item;
 use pocketmine\world\Position;
 
-class FurnaceInventory extends SimpleInventory implements BlockInventory{
+class FurnaceInventory extends SimpleInventory implements BlockInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public const SLOT_INPUT = 0;
 	public const SLOT_FUEL = 1;

src/block/inventory/HopperInventory.php

@@ -26,8 +26,9 @@
 use pocketmine\inventory\SimpleInventory;
 use pocketmine\world\Position;
 
-class HopperInventory extends SimpleInventory implements BlockInventory{
+class HopperInventory extends SimpleInventory implements BlockInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder, int $size = 5){
 		$this->holder = $holder;

src/block/inventory/LoomInventory.php

@@ -27,8 +27,9 @@
 use pocketmine\inventory\TemporaryInventory;
 use pocketmine\world\Position;
 
-final class LoomInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
+final class LoomInventory extends SimpleInventory implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public const SLOT_BANNER = 0;
 	public const SLOT_DYE = 1;

src/block/inventory/ProximityRestricted.php

@@ -0,0 +1,41 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+ */
+
+declare(strict_types=1);
+
+namespace pocketmine\block\inventory;
+
+/**
+ * Represents a block that has a maximum distance the player can be away from it.
+ *
+ * This need to be combined with the BlockInventory interface to be useful.
+ */
+interface ProximityRestricted {
+
+	public const MAX_DISTANCE = 6;
+
+	/**
+	 * Returns the max distance the player can be away from the holder
+	 *
+	 * @phpstan-return positive-int
+	 */
+	public function getMaxDistance() : int;
+}

src/block/inventory/ProximityRestrictedTrait.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+ */
+
+declare(strict_types=1);
+
+namespace pocketmine\block\inventory;
+
+trait ProximityRestrictedTrait{
+	/** @phpstan-var positive-int */
+	protected int $maxDistance = ProximityRestricted::MAX_DISTANCE;
+
+	public  function getMaxDistance() : int{
+		return $this->maxDistance;
+	}
+}

src/block/inventory/ShulkerBoxInventory.php

@@ -34,8 +34,9 @@
 use pocketmine\world\sound\ShulkerBoxOpenSound;
 use pocketmine\world\sound\Sound;
 
-class ShulkerBoxInventory extends SimpleInventory implements BlockInventory{
+class ShulkerBoxInventory extends SimpleInventory implements BlockInventory, ProximityRestricted{
 	use AnimatedBlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder){
 		$this->holder = $holder;

src/block/inventory/SmithingTableInventory.php

@@ -27,8 +27,9 @@
 use pocketmine\inventory\TemporaryInventory;
 use pocketmine\world\Position;
 
-final class SmithingTableInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
+final class SmithingTableInventory extends SimpleInventory implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public function __construct(Position $holder){
 		$this->holder = $holder;

src/block/inventory/StonecutterInventory.php

@@ -27,8 +27,9 @@
 use pocketmine\inventory\TemporaryInventory;
 use pocketmine\world\Position;
 
-class StonecutterInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
+class StonecutterInventory extends SimpleInventory implements BlockInventory, TemporaryInventory, ProximityRestricted{
 	use BlockInventoryTrait;
+	use ProximityRestrictedTrait;
 
 	public const SLOT_INPUT = 0;
 

src/player/Player.php

@@ -26,6 +26,8 @@
 use pocketmine\block\BaseSign;
 use pocketmine\block\Bed;
 use pocketmine\block\BlockTypeTags;
+use pocketmine\block\inventory\BlockInventory;
+use pocketmine\block\inventory\ProximityRestricted;
 use pocketmine\block\UnknownBlock;
 use pocketmine\block\VanillaBlocks;
 use pocketmine\command\CommandSender;
@@ -296,6 +298,8 @@ public static function isValidUserName(?string $name) : bool{
 
 	protected ?SurvivalBlockBreakHandler $blockBreakHandler = null;
 
+	protected ?Vector3 $containerOpenPosition = null;
+
 	public function __construct(Server $server, NetworkSession $session, PlayerInfo $playerInfo, bool $authenticated, Location $spawnLocation, ?CompoundTag $namedtag){
 		$username = TextFormat::clean($playerInfo->getUsername());
 		$this->logger = new \PrefixedLogger($server->getLogger(), "Player: $username");
@@ -1374,6 +1378,12 @@ protected function processMostRecentMovements() : void{
 			$this->logger->debug("Exceeded movement rate limit, forcing to last accepted position");
 			$this->sendPosition($this->location, $this->location->getYaw(), $this->location->getPitch(), MovePlayerPacket::MODE_RESET);
 		}
+		if($this->containerOpenPosition !== null &&
+			$this->currentWindow instanceof ProximityRestricted &&
+			$this->location->distance($this->containerOpenPosition) > $this->currentWindow->getMaxDistance()
+		){
+			$this->removeCurrentWindow();
+		}
 	}
 
 	protected function revertMovement(Location $from) : void{
@@ -2646,6 +2656,14 @@ public function setCurrentWindow(Inventory $inventory) : bool{
 		$inventoryManager->onCurrentWindowChange($inventory);
 		$inventory->onOpen($this);
 		$this->currentWindow = $inventory;
+
+		if($inventory instanceof ProximityRestricted &&
+			$inventory instanceof BlockInventory &&
+			$inventory->getMaxDistance() > 0
+		){
+			$this->containerOpenPosition = $inventory->getHolder()->asPosition();
+		}
+
 		return true;
 	}
 
@@ -2661,6 +2679,8 @@ public function removeCurrentWindow() : void{
 			$this->currentWindow = null;
 			(new InventoryCloseEvent($currentWindow, $this))->call();
 		}
+
+		$this->containerOpenPosition = null;
 	}
 
 	protected function addPermanentInventories(Inventory ...$inventories) : void{