added Inventory UI

added logic to inventory
 * it is very possible to be reworked in the near future
 * With
   - ScriptableItem
   - an own Inventory class maybe
   - if necessary no Dictionary anymore

Assets/Scripts/InventorySlot.cs

@@ -0,0 +1,30 @@
+using UnityEngine;
+using UnityEngine.UI;
+
+public class InventorySlot : MonoBehaviour {
+    public Image icon;
+    
+    private Item item;
+
+    public void addItem(Item newItem) {
+        item = newItem;
+
+        icon.sprite = item.defaultSprite;
+        icon.enabled = true;
+    }
+
+    public void clearSlot() {
+        item = null;
+        icon.sprite = null;
+        icon.enabled = false;
+    }
+
+    public void removeItem() {
+        PlayerController.instance.inventory.Remove(item);
+    }
+
+    public void useItem() {
+        //TODO: use item
+        Debug.Log("using " + item.displayName);
+    }
+}

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Assets/Scripts/InventoryUI.cs

@@ -0,0 +1,34 @@
+using UnityEngine;
+
+public class InventoryUI : MonoBehaviour {
+
+    public Transform itemsParent;
+    public GameObject inventoryUI;
+    private PlayerController playerController;
+    private InventorySlot[] slots;
+    
+    // Start is called before the first frame update
+    void Start() {
+        playerController = PlayerController.instance;
+        playerController.onItemChangedCallback += updateUI;
+
+        slots = itemsParent.GetComponentsInChildren<InventorySlot>();
+    }
+
+    // Update is called once per frame
+    void Update() {
+        if(Input.GetButtonDown("Inventory")) {
+            inventoryUI.SetActive(!inventoryUI.activeSelf);
+        }
+    }
+    
+    private void updateUI() {
+        for(int i = 0; i < slots.Length; i++) {
+            if(i < playerController.inventory.Count) {
+                // slots[i].addItem(playerController.inventory[i]); //TODO: dictionary "letztes" Item finden, Wie?!?!?!
+            } else {
+                slots[i].clearSlot();
+            }
+        }
+    }
+}

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Assets/Scripts/Item.cs

@@ -1,10 +1,13 @@
 using System;
 using UnityEngine;
 
+//TODO: Auf ScriptableItem umschreiben!!!!!!!!!!
+//
+//https://www.youtube.com/watch?v=YLhj7SfaxSE
 public class Item : MonoBehaviour, IComparable<Item> {
-    private readonly string displayName;
-    private readonly string description;
-    private readonly int id;  //TODO: create an actual ID System that makes snens
+    public readonly string displayName;
+    public readonly string description;
+    public readonly int id;  //TODO: create an actual ID System that makes snens
     public SpriteRenderer spriteRenderer;
     public Sprite selectedSprite;
     public Sprite defaultSprite;

Assets/Scripts/PlayerController.cs

@@ -1,42 +1,64 @@
-using System;
-using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerController : MonoBehaviour {
-    private Dictionary<Item, int> inventory;
-    private int money;
-    private UsableItem selectedItem;
-    
-    private static PlayerController instance;
-    
-    public int startMoney = 100;
+    #region Singleton
 
-    public static PlayerController getInstance() {
-        return instance;
-    }
-    
+    public static PlayerController instance;
+
+    private void Awake() {
+        if(instance != null) {
+            Debug.LogWarning("More than one instance of PlayeController found");
+        }
 
-    // Start is called before the first frame update
-    void Start()
-    {
-        inventory ??= new Dictionary<Item, int>();
-        money = startMoney;
         instance = this;
     }
 
-    // Update is called once per frame
-    void Update()
-    {
-        
+    #endregion
+
+    public Dictionary<Item, int> inventory;
+    public readonly int inventorySpace = 28;
+    private int money;
+    private UsableItem selectedItem;
+
+    public int startMoney = 100;
+
+    // Start is called before the first frame update
+    void Start() {
+        inventory ??= new Dictionary<Item, int>();
+        money = startMoney;
     }
 
+    // Update is called once per frame
+    void Update() { }
+
     public void setSelectedItem(UsableItem item) {
-        if (inventory.ContainsKey(item)) {
+        if(inventory.ContainsKey(item)) {
             selectedItem = item;
-            Cursor.SetCursor(item.defaultSprite.texture,  Vector2.zero, CursorMode.Auto);
+            Cursor.SetCursor(item.defaultSprite.texture, Vector2.zero, CursorMode.Auto);
         } else {
-          Debug.Log("An item requested to select isn't in the inventory" + item);  
+            Debug.Log("An item requested to select isn't in the inventory" + item);
         }
     }
-}
+
+    public delegate void onItemChanged();
+
+    public onItemChanged onItemChangedCallback;
+
+    public void addItem(Item item, int amount) {
+        if(inventory.Count >= inventorySpace) {
+            Debug.Log("Not enough inventory space!");
+            return;
+        }
+
+        inventory.Add(item, amount);
+        
+        onItemChangedCallback?.Invoke();
+    }
+    
+    public void removeItem(Item item, int amount) {
+        inventory.Add(item, -amount);
+        
+        onItemChangedCallback?.Invoke();
+    }
+}

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Assets/Scripts/UsableItem.cs

@@ -2,26 +2,19 @@ using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
-public class UsableItem : Item, IUsable
-{
+public class UsableItem : Item, IUsable {
     // Start is called before the first frame update
-    void Start()
-    {
-        
+    void Start() {
     }
 
     // Update is called once per frame
-    void Update()
-    {
-        
+    void Update() {
     }
 
-        public UsableItem(string displayName, string description, int id) : base(displayName, description, id)
-        {
-        }
-
-        public void select()
-        {
-            PlayerController.getInstance().setSelectedItem(this);
-        }
+    public UsableItem(string displayName, string description, int id) : base(displayName, description, id) {
     }
+
+    public void select() {
+        PlayerController.instance.setSelectedItem(this);
+    }
+}

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