inventory ui

Assets/Scripts/Inventory.cs

@@ -1,7 +1,11 @@
 using System.Collections.Generic;
 using UnityEngine;
+using System;
 public class Inventory : MonoBehaviour
 {
+  public static Action OnPlayerInventoryChanged;
+
+  public bool isPlayerInventory = false;
   public int maxSlots = 20; // maximum number of slots in the inventory
   public List<InventoryItem> items = new List<InventoryItem>(); // list of items in the inventory
 
@@ -27,6 +31,11 @@ public class Inventory : MonoBehaviour
           // exit the loop if all items have been added
           if (remainingCount == 0)
           {
+            if (isPlayerInventory)
+            {
+              OnPlayerInventoryChanged?.Invoke();
+            }
+
             return 0;
           }
         }
@@ -42,6 +51,10 @@ public class Inventory : MonoBehaviour
     }
 
     // return the quantity of items which could not be added
+    if (isPlayerInventory)
+    {
+      OnPlayerInventoryChanged?.Invoke();
+    }
     return remainingCount;
   }
 
@@ -71,12 +84,20 @@ public class Inventory : MonoBehaviour
         // exit the loop if all items have been removed
         if (remainingCount == 0)
         {
+          if (isPlayerInventory)
+          {
+            OnPlayerInventoryChanged?.Invoke();
+          }
           return 0;
         }
       }
     }
 
     // return the quantity of items which could not be removed
+    if (isPlayerInventory)
+    {
+      OnPlayerInventoryChanged?.Invoke();
+    }
     return remainingCount;
   }
 }

Assets/Scripts/Item.cs

@@ -8,6 +8,7 @@ public class Item : ScriptableObject
   public string uuid;
   public string itemName;
 
+  public Sprite sprite;
   public bool stackable = true;
   public int maxStackSize = 100;
 

Assets/Scripts/PlayerController.cs

@@ -7,42 +7,60 @@ public class PlayerController : MonoBehaviour
 
   public Item testItem1;
   public Item testItem2;
+
+  [SerializeField] private int hotbarSlotCount = 9;
+  [SerializeField] private int activeHotbarSlot = 0;
+  [SerializeField] private Inventory playerInventory;
+
   // Start is called before the first frame update
   void Start()
   {
-
+    playerInventory = GetComponent<Inventory>();
   }
 
   // Update is called once per frame
   void Update()
   {
-    Inventory inventory = GetComponent<Inventory>();
+    float scroll = Input.GetAxis("Mouse ScrollWheel");
+    if (scroll != 0)
+    {
+      activeHotbarSlot += (int)Mathf.Sign(scroll);
+      if (activeHotbarSlot < 0)
+      {
+        activeHotbarSlot = hotbarSlotCount - 1;
+      }
+      else if (activeHotbarSlot >= hotbarSlotCount)
+      {
+        activeHotbarSlot = 0;
+      }
+    }
 
+    //! DEBUG
     if (Input.GetKeyDown(KeyCode.U))
     {
       // add 5 apples
-      int remainingCount = inventory.Add(testItem1, 5);
-      Debug.Log("Added " + (5 - remainingCount) + " apples to inventory.");
+      int remainingCount = playerInventory.Add(testItem1, 5);
+      Debug.Log("Added " + (5 - remainingCount) + " apples to playerInventory.");
     }
 
     if (Input.GetKeyDown(KeyCode.I))
     { // add 15 more apples
-      int remainingCount = inventory.Add(testItem1, 15);
-      Debug.Log("Added " + (15 - remainingCount) + " apples to inventory.");
+      int remainingCount = playerInventory.Add(testItem1, 15);
+      Debug.Log("Added " + (15 - remainingCount) + " apples to playerInventory.");
     }
 
     if (Input.GetKeyDown(KeyCode.O))
     {
       // add 10 bananas
-      int remainingCount = inventory.Add(testItem2, 10);
-      Debug.Log("Added " + (10 - remainingCount) + " bananas to inventory.");
+      int remainingCount = playerInventory.Add(testItem2, 10);
+      Debug.Log("Added " + (10 - remainingCount) + " bananas to playerInventory.");
     }
 
 
     if (Input.GetKeyDown(KeyCode.J))
     {
       int count = 3;
-      int applesRemaining = inventory.Remove(testItem1, count);
+      int applesRemaining = playerInventory.Remove(testItem1, count);
       Debug.Log("Removed " + (count - applesRemaining) + " apples.");
 
     }
@@ -50,7 +68,7 @@ public class PlayerController : MonoBehaviour
     if (Input.GetKeyDown(KeyCode.K))
     {
       int count = 5;
-      int bananasRemaining = inventory.Remove(testItem2, count);
+      int bananasRemaining = playerInventory.Remove(testItem2, count);
       Debug.Log("Removed " + (count - bananasRemaining) + " bananas.");
 
     }

Assets/Scripts/UI.meta

@@ -0,0 +1,8 @@
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+folderAsset: yes
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+  userData: 
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Assets/Scripts/UI/InventoryUI.cs

@@ -0,0 +1,50 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class InventoryUI : MonoBehaviour
+{
+  [SerializeField] private GameObject slotPrefab;
+  [SerializeField] private GameObject slotListObj;
+  [SerializeField] private List<SlotUI> slotUIList;
+
+  private Inventory playerInventory;
+
+  private void Start()
+  {
+    playerInventory = GameObject.FindGameObjectWithTag("Player").GetComponent<Inventory>();
+    Inventory.OnPlayerInventoryChanged += UpdateSlots;
+    CreateSlots();
+    UpdateSlots();
+
+  }
+
+  private void CreateSlots()
+  {
+    playerInventory = GameObject.FindGameObjectWithTag("Player").GetComponent<Inventory>();
+
+    for (int i = 0; i < playerInventory.maxSlots; i++)
+    {
+      slotUIList.Add(Instantiate(slotPrefab, Vector3.zero, Quaternion.identity, slotListObj.transform).GetComponent<SlotUI>());
+    }
+  }
+  private void UpdateSlots()
+  {
+    Debug.Log("Update slots");
+    int i = 0;
+    foreach (SlotUI slotUi in slotUIList)
+    {
+      if (i < playerInventory.items.Count)
+      {
+        slotUi.SetInventoryItem(playerInventory.items[i]);
+      }
+      else
+      {
+        slotUi.SetInventoryItem(null);
+      }
+
+      i++;
+    }
+  }
+
+}

Assets/Scripts/UI/InventoryUI.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/UI/SlotUI.cs

@@ -0,0 +1,44 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class SlotUI : MonoBehaviour
+{
+  [SerializeField] private InventoryItem inventoryItem;
+  [SerializeField] private Image itemSpriteImage;
+  [SerializeField] private TMPro.TextMeshProUGUI quantityText;
+
+  private void Start()
+  {
+    UpdateSlot();
+  }
+  public void SetInventoryItem(InventoryItem newInventoryItem)
+  {
+    inventoryItem = newInventoryItem;
+    UpdateSlot();
+  }
+
+  private void UpdateSlot()
+  {
+    if (inventoryItem != null)
+    {
+      itemSpriteImage.sprite = inventoryItem?.item?.sprite ?? null;
+      Debug.Log(itemSpriteImage.sprite);
+      if (itemSpriteImage.sprite == null)
+      {
+        itemSpriteImage.color = new Color(0, 0, 0, 0);
+      }
+
+      quantityText.SetText(inventoryItem.count != 0 ? inventoryItem.count.ToString() : "");
+    }
+    else
+    {
+      itemSpriteImage.sprite = null;
+      quantityText.SetText("");
+      itemSpriteImage.color = new Color(0, 0, 0, 0);
+    }
+
+  }
+
+}

Assets/Scripts/UI/SlotUI.cs.meta

@@ -0,0 +1,11 @@
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