Added interaction, hand, rigidbody dragging, picking up hammer

Assets/Plugins/Interaction/Runtime/Items/Slot.cs

@@ -0,0 +1,196 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+using Nothke.Interaction.Items;
+using Nothke.Interaction.UI;
+
+namespace Nothke.Interaction
+{
+    public class Slot : Interactable, IItemReceivable, IItemInHandsInteractionDependable
+    {
+        public Transform slotPivot;
+
+        public string slotTag;
+        public virtual string SlotTag => slotTag;
+
+        public ISlottable itemInSlot;
+        public bool Occupied => itemInSlot != null;
+
+        public override string Label
+        {
+            get
+            {
+                if (itemInSlot != null)
+                    return (itemInSlot as Interactable).Label;
+
+                return "";
+            }
+        }
+
+#if UNITY_EDITOR
+        private void Awake()
+        {
+            if (slotPivot.IsNonUniform())
+                Debug.LogError("Slot lossy scale is not uniform, this is not allowed.", slotPivot);
+        }
+#endif
+
+        public virtual bool IsInteractableIfHolding(Interactable item)
+        {
+            // if occupied and holding an item, not able to interact
+            if (item != null && itemInSlot != null)
+                return false;
+
+            // if occupied and not holding anything, able to take
+            if (item == null && itemInSlot != null)
+                return true;
+
+            var slottable = item as ISlottable;
+
+            if (slottable == null) return false;
+
+            if (!slottable.IsSlottable)
+                return false;
+
+            if (CanReceive(slottable))
+                return true;
+
+            return false;
+        }
+
+        public virtual bool CanReceive(ISlottable slottable)
+        {
+            if (itemInSlot != null) return false;
+
+            Debug.Assert(slottable != null, "CanReceive slottable is null");
+
+            if (slottable.SlotTag == SlotTag)
+                return true;
+            else return false;
+        }
+
+        public override void Use(InteractionController im)
+        {
+            manager = im;
+            SlotOrTake(im);
+        }
+
+        public void SlotOrTake(InteractionController im)
+        {
+            var hands = im.hands;
+
+            if (!hands.item && itemInSlot != null)
+            {
+                if (IsTakeable)
+                    Take();
+            }
+            else
+            if (hands.item && hands.item is ISlottable)
+            {
+                SlotItemFromHands(hands);
+            }
+        }
+
+        public virtual bool IsTakeable => true;
+
+        public void Take()
+        {
+            if (itemInSlot == null)
+            {
+                Debug.LogError("Attempting to take an item from slot but there is none");
+                return;
+            }
+
+            var takeable = itemInSlot as ITakeable;
+
+            Debug.Assert(takeable != null, "Item is slottable but not takeable", this);
+
+            OnBeforeTaken();
+
+            manager.hands.Take(takeable);
+
+            itemInSlot.OnRemovedFromSlot();
+            itemInSlot.SlottedIn = null;
+            itemInSlot = null;
+
+            manager.Recast();
+        }
+
+        public void SlotItemFromHands(IHands hands)
+        {
+            if (CanReceive(hands.item as ISlottable))
+            {
+                manager.hands.Place(Vector3.zero, Quaternion.identity, slotPivot, this);
+
+                var item = hands.item;
+
+                // if not smooth placement:
+                //itemInSlot = item as ISlottable;
+                //itemInSlot.SlottedIn = this;
+                //itemInSlot.OnSlotted();
+                //OnSlot();
+
+                // if smooth placement, hands will callback the slot:
+                (item as ISlottable).OnStartedPlacing(hands);
+            }
+        }
+
+        public bool SetItemInSlot(ISlottable item)
+        {
+            Debug.Assert(item != null, "ISlottable passed is null");
+            //Debug.Log("Slotted " + (item as Component).gameObject.name + " into " + gameObject.name, this);
+
+            if (CanReceive(item))
+            {
+                var itemT = (item as Component).transform;
+                itemT.parent = slotPivot;
+                itemT.localPosition = Vector3.zero;
+                itemT.localRotation = Quaternion.identity;
+
+                itemInSlot = item;
+                item.SlottedIn = this;
+
+                item.OnSlotted();
+                OnSlot();
+            }
+            else
+            {
+                Debug.LogError("Slot can't receive this item, tags don't match OR already holding item", item as Component);
+                return false;
+            }
+
+            if (manager)
+                manager.Recast();
+
+            return true;
+        }
+
+        public ISlottable RemoveItemFromSlot()
+        {
+            var takeable = itemInSlot as ITakeable;
+
+            OnBeforeTaken();
+
+            var _item = itemInSlot;
+            itemInSlot = null;
+
+            (_item as Component).transform.SetParent(null);
+            _item.OnRemovedFromSlot();
+            _item.SlottedIn = null;
+
+            return _item;
+        }
+
+        public virtual void OnBeforeTaken() { }
+        public virtual void OnSlot() { }
+
+        public ReticleUI.State GetCustomReticle()
+        {
+            if (itemInSlot != null)
+                return ReticleUI.State.Take;
+            else
+                return ReticleUI.State.Slot;
+        }
+    }
+}