How to find if item is in inventory using these scripts?

So I followed some YouTube videos to create an inventory system and I'm currently tweaking them to fit my needs. One need of mine is to find out if a key is in my inventory to be able to open a door. I already know the function I need to check if the trigger and key are pressed, but I also need to know if I have the key. Could someone help me? Thank you for your time.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5. using TMPro;
6. using CodeMonkey.Utils;
7.  
8. public class UI_Inventory : MonoBehaviour
9. {
10.     private Inventory inventory;
11.     private Transform itemSlotContainer;
12.     private Transform itemSlotTemplate;
13.     private PlayerUpDown player;
14.  
15.     public void Awake()
16.     {
17.         itemSlotContainer = transform.Find("itemSlotContainer");
18.         itemSlotTemplate = itemSlotContainer.Find("itemSlotTemplate");
19.     }
20.  
21.     public void SetPlayer(PlayerUpDown player)
22.     {
23.         this.player = player;
24.     }
25.  
26.     public void SetInventory(Inventory inventory)
27.     {
28.         this.inventory = inventory;
29.  
30.         inventory.OnItemListChanged += Inventory_OnItemListChanged;
31.         RefreshInventoryItems();
32.     }
33.  
34.     private void Inventory_OnItemListChanged(object sender, System.EventArgs e)
35.     {
36.         RefreshInventoryItems();
37.     }
38.  
39.     private void RefreshInventoryItems()
40.     {
41.         foreach (Transform child in itemSlotContainer)
42.         {
43.             if (child == itemSlotTemplate) continue;
44.             Destroy(child.gameObject);
45.         }
46.  
47.         int x = 0;
48.         int y = 0;
49.         float itemSlotCellSize = 100f;
50.         foreach (Item item in inventory.GetItemList())
51.         {
52.             RectTransform itemSlotRectTransform = Instantiate(itemSlotTemplate, itemSlotContainer).GetComponent<RectTransform>();
53.             itemSlotRectTransform.gameObject.SetActive(true);
54.  
55.             itemSlotRectTransform.GetComponent<Button_UI>().ClickFunc = () =>
56.             {
57.  
58.             };
59.             itemSlotRectTransform.GetComponent<Button_UI>().MouseRightClickFunc = () =>
60.             {
61.                 // Drop item
62.                 inventory.RemoveItem(item);
63.                 ItemWorld.DropItem(player.GetPosition(), item);
64.             };
65.  
66.             itemSlotRectTransform.anchoredPosition = new Vector2(x * itemSlotCellSize, y * itemSlotCellSize + 100);
67.             Image image = itemSlotRectTransform.Find("image").GetComponent<Image>();
68.             image.sprite = item.GetSprite();
69.  
70.             x++;
71.             if (x > 4)
72.             {
73.                 x = 0;
74.                 y++;
75.             }
76.         }
77.     }
78. }
79.  

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using System;
5.  
6. [Serializable]
7. public class Item
8. {
9.     public enum ItemType
10.     {
11.         Red,
12.         Blue,
13.         Key,
14.     }
15.  
16.     public ItemType itemType;
17.     public int amount;
18.  
19.     public Sprite GetSprite()
20.     {
21.         switch (itemType)
22.         {
23.             default:
24.             case ItemType.Red: return ItemAssets.Instance.redItem;
25.             case ItemType.Blue: return ItemAssets.Instance.blueItem;
26.             case ItemType.Key: return ItemAssets.Instance.keyItem;
27.         }
28.     }
29.  
30.     public bool IsStackable()
31.     {
32.         switch (itemType)
33.         {
34.             default:
35.             case ItemType.Red:
36.             case ItemType.Blue:
37.                 return true;
38.             case ItemType Key:
39.                 return false;
40.         }
41.     }
42. }
43.  

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using System;
5.  
6. public class Inventory
7. {
8.     public event EventHandler OnItemListChanged;
9.  
10.     private List<Item> itemList;
11.  
12.     public Inventory()
13.     {
14.         itemList = new List<Item>();
15.     }
16.  
17.     public void AddItem(Item item)
18.     {
19.         if (item.IsStackable())
20.         {
21.             bool itemAlreadyInInventory = false;
22.             foreach (Item inventoryItem in itemList)
23.             {
24.                 if (inventoryItem.itemType == item.itemType)
25.                 {
26.                     inventoryItem.amount += item.amount;
27.                     itemAlreadyInInventory = true;
28.                 }
29.             }
30.             if (!itemAlreadyInInventory)
31.             {
32.                 itemList.Add(item);
33.             }
34.         }
35.         else
36.         {
37.             itemList.Add(item);
38.         }
39.         OnItemListChanged?.Invoke(this, EventArgs.Empty);
40.     }
41.  
42.     public List<Item> GetItemList()
43.     {
44.         return itemList;
45.     }
46.  
47.     public void RemoveItem(Item item)
48.     {
49.         if (item.IsStackable())
50.         {
51.             Item itemInInventory = null;
52.             foreach (Item inventoryItem in itemList)
53.             {
54.                 if (inventoryItem.itemType == item.itemType)
55.                 {
56.                     inventoryItem.amount -= item.amount;
57.                     itemInInventory = inventoryItem;
58.                 }
59.             }
60.             if (itemInInventory != null && itemInInventory.amount <= 0)
61.             {
62.                 itemList.Remove(itemInInventory);
63.             }
64.         }
65.         else
66.         {
67.             itemList.Remove(item);
68.         }
69.         OnItemListChanged?.Invoke(this, EventArgs.Empty);
70.     }
71. }
72.  

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.SceneManagement;
5.  
6. public class PlayerUpDown : MonoBehaviour
7. {
8.     public float moveSpeed = 5f;
9.  
10.     public Rigidbody2D rb;
11.     public Animator animator;
12.  
13.     Vector2 movement;
14.  
15.     private Inventory inventory;
16.  
17.     [SerializeField] private UI_Inventory uiInventory;
18.  
19.     private void Update()
20.     {
21.         movement.x = Input.GetAxisRaw("Horizontal");
22.         movement.y = Input.GetAxisRaw("Vertical");
23.  
24.         animator.SetFloat("Horizontal", movement.x);
25.         animator.SetFloat("Vertical", movement.y);
26.         animator.SetFloat("Speed", movement.sqrMagnitude);
27.     }
28.  
29.     private void FixedUpdate()
30.     {
31.         rb.MovePosition(rb.position + movement * moveSpeed * Time.deltaTime);
32.     }
33.  
34.     private void Awake()
35.     {
36.         {
37.             inventory = new Inventory();
38.             uiInventory.SetInventory(inventory);
39.  
40.             uiInventory.SetPlayer(this);
41.         }
42.     }
43.  
44.     private void OnTriggerStay2D(Collider2D collider)
45.     {
46.         Debug.Log("This is called every frame.");
47.         ItemWorld itemWorld = collider.GetComponent<ItemWorld>();
48.         if (itemWorld != null && InputKeyPressed())
49.         {
50.             inventory.AddItem(itemWorld.GetItem());
51.             itemWorld.DestroySelf();
52.         }
53.         else if (collider.CompareTag("Door") && InputKeyPressed())
54.         {
55.             Debug.Log("Door is unlocked.");
56.             SceneManager.LoadScene(1);
57.         }
58.     }
59.  
60.     private bool InputKeyPressed()
61.     {
62.         return Input.GetKeyDown(KeyCode.E);
63.     }
64.  
65.     public Vector3 GetPosition()
66.     {
67.         return transform.position;
68.     }
69. }
70.  

 

Code (CSharp):

1. //In your OnCollision Door detect
2.  
3. foreach (Item item in inventory.GetItemList())
4. {
5.     if (item.itemType == ItemType.Key)
6.     {
7.         //Open door
8.         //Remove key
9.         //Add effect .. etc...
10.     }
11. }

If you have different keys then you have to modify the item class and add a more complex key structure
Maybe you want to open a blue door with a blue key (or something like that)

 

AND VWALLA IT WORKS. Thank you kind stranger.