drag & drop with inventory slots

entities/player/inventory/scripts/inventory.gd

@@ -73,16 +73,34 @@ func update_seeds_size(size = seeds_size):
     while len(seeds) > size and seeds.find(null) != -1:
         seeds.pop_at(seeds.find(null))
 
+func add_item_at(item: Item, item_ind: int) -> bool:
+    if item.type == Item.ItemType.CONSUMABLE_ITEM:
+        return add_seed_at(item, item_ind - tools.size())
+    else:
+        return false
+
+func add_seed_at(s: Item, seed_ind: int) -> bool:
+    update_seeds_size()
+    if seeds[seed_ind]:
+        return false
+    else:
+        seeds[seed_ind] = s
+        updated.emit(self)
+        return true
+
+func get_all_items_size() -> int:
+    return tools.size() + seeds.size()
+
 func get_all_items() -> Array[Item]:
     return tools + seeds
 
 func get_item(ind: int = current_item_ind) -> Item:
-    if ind < 0 || ind > len(get_all_items()):
+    if ind < 0 || ind > get_all_items_size():
         return null
     return get_all_items()[ind]
 
 func has_item(item: Item) -> bool:
-    return get_all_items().has(item)
+    return tools.has(item) || seeds.has(item)
 
 func has_item_with_name(name: String) -> bool:
     var id = get_all_items().find_custom(