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Assets/Opsive/UltimateCharacterController/Scripts/Character/Abilities/Items/EquipScroll.cs

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+/// ---------------------------------------------
+/// Ultimate Character Controller
+/// Copyright (c) Opsive. All Rights Reserved.
+/// https://www.opsive.com
+/// ---------------------------------------------
+
+namespace Opsive.UltimateCharacterController.Character.Abilities.Items
+{
+    using Opsive.UltimateCharacterController.Utility;
+    using UnityEngine;
+
+    /// <summary>
+    /// The EquipScroll ability will scroll between the previous and next abilities with the scroll wheel.
+    /// </summary>
+    [DefaultStartType(AbilityStartType.Axis)]
+    [DefaultInputName("Mouse ScrollWheel")]
+    [AllowDuplicateTypes]
+    public class EquipScroll : ItemSetAbilityBase
+    {
+        [Tooltip("The sensitivity for switching between items. The higher the value the faster the scroll wheel has to scroll in order to switch items.")]
+        [SerializeField] protected float m_ScrollSensitivity = 0.1f;
+
+        public float ScrollSensitivity { get { return m_ScrollSensitivity; } set { m_ScrollSensitivity = value; } }
+
+        private int m_ScrollItemSetIndex = -1;
+
+        /// <summary>
+        /// Initialize the default values.
+        /// </summary>
+        public override void Awake()
+        {
+            base.Awake();
+
+            // The EquipUnequip must exist in order for the item to be able to be equip toggled.
+            if (m_EquipUnequipItemAbility == null) {
+                Debug.LogError($"Error: The EquipUnequip ItemAbility with the category ID {m_ItemSetCategoryID} must be added to the character.");
+                Enabled = false;
+            }
+        }
+
+        /// <summary>
+        /// Called when the ablity is tried to be started. If false is returned then the ability will not be started.
+        /// </summary>
+        /// <returns>True if the ability can be started.</returns>
+        public override bool CanStartAbility()
+        {
+            // An attribute may prevent the ability from starting.
+            if (!base.CanStartAbility()) {
+                return false;
+            }
+
+            // Don't scroll items if the scroll wheel value isn't large enough.
+            if (Mathf.Abs(InputAxisValue) < m_ScrollSensitivity) {
+                return false;
+            }
+
+            m_ScrollItemSetIndex = m_ItemSetManager.NextActiveItemSetIndex(m_ItemSetCategoryIndex, m_EquipUnequipItemAbility.ActiveItemSetIndex, InputAxisValue > 0);
+
+            return m_ScrollItemSetIndex != -1 && m_ScrollItemSetIndex != m_EquipUnequipItemAbility.ActiveItemSetIndex;
+        }
+
+        /// <summary>
+        /// The ability has started.
+        /// </summary>
+        protected override void AbilityStarted()
+        {
+            base.AbilityStarted();
+
+            m_EquipUnequipItemAbility.StartEquipUnequip(m_ScrollItemSetIndex);
+
+            // It is up to the EquipUnequip ability to do the actual equip - stop the current ability.
+            StopAbility();
+        }
+    }
+}