(Feat) add crafting discovery + notification + inventory tool tips

Assets/GAME/Script/Inventory/SlotUI.cs

@@ -6,7 +6,7 @@ using System;
 
 namespace Ashwild.Inventory
 {
-    public class SlotUI : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, IDropHandler, IPointerClickHandler
+    public class SlotUI : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, IDropHandler, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler
     {
         [Header("References")]
         [SerializeField] private Image iconImage;
@@ -26,6 +26,8 @@ namespace Ashwild.Inventory
         private int slotIndex;
         private Action<int, int> onSwapRequested;
         private Action<int, bool> onClicked;
+        private Action<int> onHoverEnter;
+        private Action onHoverExit;
 
         public int SlotIndex => slotIndex;
 
@@ -43,11 +45,14 @@ namespace Ashwild.Inventory
             ghostObject.SetActive(false);
         }
 
-        public void Initialize(int index, Action<int, int> swapCallback, Action<int, bool> clickCallback)
+        public void Initialize(int index, Action<int, int> swapCallback, Action<int, bool> clickCallback,
+            Action<int> hoverEnterCallback = null, Action hoverExitCallback = null)
         {
             slotIndex = index;
             onSwapRequested = swapCallback;
             onClicked = clickCallback;
+            onHoverEnter = hoverEnterCallback;
+            onHoverExit = hoverExitCallback;
         }
 
         /// <summary>
@@ -170,5 +175,23 @@ namespace Ashwild.Inventory
             if (eventData.button == PointerEventData.InputButton.Right)
                 onClicked?.Invoke(slotIndex, true);
         }
+
+        /// <summary>
+        /// Reports the hovered slot index so the manager can show its description panel. Suppressed
+        /// while a drag is in progress, where the panel would only get in the way.
+        /// </summary>
+        public void OnPointerEnter(PointerEventData eventData)
+        {
+            if (draggedSlot != null) return;
+            onHoverEnter?.Invoke(slotIndex);
+        }
+
+        /// <summary>
+        /// Reports that the pointer left the slot so the manager can hide the description panel.
+        /// </summary>
+        public void OnPointerExit(PointerEventData eventData)
+        {
+            onHoverExit?.Invoke();
+        }
     }
 }