Update

Assets/Invector-3rdPersonController/ItemManager/Scripts/Examples/vCheckCanAddHealth.cs

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+using System.Collections.Generic;
+
+namespace Invector.vItemManager
+{
+    using vCharacterController;
+
+    [vClassHeader("Check if can Add Health", "Simple Example to verify if the health item can be used based on the character's health is full or not.", openClose = false)]
+    public class vCheckCanAddHealth : vMonoBehaviour
+    {
+        public vItemManager itemManager;
+        public vThirdPersonController tpController;
+
+        public bool getInParent = true;
+
+        protected bool canUse;
+        protected bool firstRun;
+
+        protected virtual void Start()
+        {
+            // first we need to access our itemManager from the Controller
+            if (itemManager == null)
+            {
+                //check 'getInParent' if this script is attached to a children of the itemManager
+                if (getInParent)
+                    itemManager = GetComponentInParent<vItemManager>();
+                else
+                    itemManager = GetComponent<vItemManager>();
+            }
+
+            // now we access the Controller itself to know the currentHealth later
+            if (tpController == null)
+            {
+                if (getInParent)
+                    tpController = GetComponentInParent<vThirdPersonController>();
+                else
+                    tpController = GetComponent<vThirdPersonController>();
+            }
+
+            // if a itemManager is founded, we use this event to call our CanUseItem method 
+            if (itemManager)
+            {
+                itemManager.canUseItemDelegate -= new vItemManager.CanUseItemDelegate(CanUseItem);
+                itemManager.canUseItemDelegate += new vItemManager.CanUseItemDelegate(CanUseItem);
+            }
+        }
+
+        protected virtual void OnDestroy()
+        {
+            var itemManager = GetComponent<vItemManager>();
+            if (itemManager)
+                // remove the event when this gameObject is destroyed
+                itemManager.canUseItemDelegate -= new vItemManager.CanUseItemDelegate(CanUseItem);
+        }
+
+        protected virtual void CanUseItem(vItem item, ref List<bool> validateResult)
+        {
+            // search for the attribute 'Health' 
+            if (item.GetItemAttribute(vItemAttributes.Health) != null)
+            {
+                // the variable valid will identify if the currentHealth is lower than the maxHealth, allowing to use the item
+                var valid = tpController.currentHealth < tpController.maxHealth;
+                if (valid != canUse || !firstRun)
+                {
+                    canUse = valid;
+                    firstRun = true;
+                    // trigger a custom text if there is a HUDController in the scene
+                    vHUDController.instance.ShowText(valid ? "Increase health" : "Can't use " + item.name + " because your health is full", 4f);
+                }
+
+                if (!valid)
+                    validateResult.Add(valid);
+            }
+        }
+    }
+}