Working on the tooltip.

Assets/Scenes/SampleScene.unity

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Assets/Scripts/UI/InventoryDisplay.cs

@@ -1,4 +1,5 @@
 using TMPro;
+using UnityEditor;
 using UnityEngine;
 using UnityEngine.UI;
 
@@ -10,6 +11,9 @@ public class InventoryDisplay : MonoBehaviour
 
     private Image background;
 
+    private readonly object TOOLTIP_LOCK = new object();
+    private Tooltip tooltip;
+
     private void Awake()
     {
         Transform slotsRoot = transform.Find("Slots");
@@ -24,16 +28,73 @@ public class InventoryDisplay : MonoBehaviour
 
         background = GetComponent<Image>();
         player = FindObjectOfType<PlayerController>();
+
+        tooltip = FindObjectOfType<Tooltip>();
     }
 
     private void Update()
     {
         bool active = Input.GetKey(KeyCode.E);
 
-        for (int i = 0; i < transform.childCount; i++) transform.GetChild(i).gameObject.SetActive(active);
+        for (int i = 0; i < transform.childCount; i++)
+        {
+            transform.GetChild(i).gameObject.SetActive(active);
+        }
         background.enabled = active;
 
-        if (active) RefreshInventory();
+        if (active)
+        {
+            RefreshInventory();
+            TickTooltip();
+        }
+        else tooltip.RemoveRequest(TOOLTIP_LOCK);
+    }
+
+    private void TickTooltip()
+    {
+        Vector2 mousePos = Input.mousePosition;
+
+        int hovering = -1;
+        for (int i = 0; i < displays.Length; i++)
+        {
+            Image img = displays[i];
+            Vector2 min = img.rectTransform.position,
+                    max = min + img.rectTransform.sizeDelta;
+
+            Debug.Log(img.rectTransform.sizeDelta);
+
+            if (min.x > max.x) (min.x, max.x) = (max.x, min.x);
+            if (min.y > max.y) (min.y, max.y) = (max.y, min.y);
+
+            if (mousePos.x >= min.x && mousePos.x <= max.x &&
+                mousePos.y >= min.y && mousePos.y <= max.y)
+            {
+                hovering = i;
+                break;
+            }
+        }
+        if (hovering == -1 || hovering >= player.Inventory.ItemSlots.Count)
+        {
+            tooltip.RemoveRequest(TOOLTIP_LOCK);
+            return;
+        }
+
+        ItemSlot slot = player.Inventory.ItemSlots[hovering];
+        if (slot.Item == null)
+        {
+            tooltip.RemoveRequest(TOOLTIP_LOCK);
+            return;
+        }
+        Tooltip.Request request = new Tooltip.Request()
+        {
+            Reference = TOOLTIP_LOCK,
+            Priority = 10,
+            Title = slot.Item.HumanName,
+            Content = slot.Item.Description,
+            Footer = $"{slot.Count} / {slot.Item.MaxSlotSize}",
+            Position = null,
+        };
+        tooltip.SetRequest(request);
     }
 
     public void RefreshInventory()

Assets/Scripts/UI/Tooltip.cs

@@ -0,0 +1,72 @@
+using System.Collections.Generic;
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class Tooltip : Singleton<Tooltip>
+{
+    private List<Request> requests;
+
+    private Image background;
+    private TextMeshProUGUI title, content, footer;
+
+    protected override void Awake()
+    {
+        base.Awake();
+        requests = new List<Request>();
+
+        background = GetComponent<Image>();
+        title = transform.Find("Title").GetComponent<TextMeshProUGUI>();
+        content = transform.Find("Content").GetComponent<TextMeshProUGUI>();
+        footer = transform.Find("Footer").GetComponent<TextMeshProUGUI>();
+    }
+
+    private bool setToMousePos = true;
+    private void Update()
+    {
+        Color desiredColor;
+        Vector2 desiredPos = transform.position;
+        if (requests.Count > 0)
+        {
+            desiredColor = Color.white;
+            Request priority = requests[0];
+            title.text = priority.Title;
+            content.text = priority.Content;
+            footer.text = priority.Footer;
+
+            if (priority.Position.HasValue)
+            {
+                desiredPos = priority.Position.Value;
+                setToMousePos = false;
+            }
+            else setToMousePos = true;
+        }
+        else desiredColor = new Color(1, 1, 1, 0);
+
+        if (setToMousePos) desiredPos = Input.mousePosition;
+
+        background.color = Color.Lerp(background.color, desiredColor, Time.deltaTime * 10);
+        title.color = Color.Lerp(title.color, desiredColor, Time.deltaTime * 10);
+        content.color = Color.Lerp(content.color, desiredColor, Time.deltaTime * 10);
+        footer.color = Color.Lerp(footer.color, desiredColor, Time.deltaTime * 10);
+
+        transform.position = Vector2.Lerp(transform.position, desiredPos, Time.deltaTime * 10);
+    }
+
+    public void SetRequest(Request request)
+    {
+        requests.Add(request);
+        requests.Sort((a, b) => a.Priority.CompareTo(b.Priority));
+    }
+    public void RemoveRequest(object reference) => requests.RemoveAll(x => x.Reference == reference);
+
+    public class Request
+    {
+        public object Reference;
+        public int Priority;
+        public string Title;
+        public string Content;
+        public string Footer;
+        public Vector2? Position;
+    }
+}

Assets/Scripts/UI/Tooltip.cs.meta

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