Introduction to Scriptable Objects

using UnityEngine;
using System.Collections;

[CreateAssetMenu(fileName = "Data", menuName = "Inventory/List", order = 1)]
public class MyScriptableObjectClass : ScriptableObject {
    public string objectName = "New MyScriptableObject";
    public bool colorIsRandom = false;
    public Color thisColor = Color.white;
    public Vector3[] spawnPoints;
}

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class UseMyScriptableObject : MonoBehaviour {
    public MyScriptableObjectClass myScriptableObject;
    private List<Light> myLights;

    // Use this for initialization
    void Start () 
    {
        myLights = new List<Light>();
        foreach (Vector3 spawn in myScriptableObject.spawnPoints) 
        {
            GameObject myLight = new GameObject("Light");
            myLight.AddComponent <Light>();
            myLight.transform.position = spawn;
            myLight.GetComponent<Light>().enabled = false;
            if (myScriptableObject.colorIsRandom) 
            {
                myLight.GetComponent<Light>().color = new Color (Random.Range (0.0f, 1.0f), Random.Range (0.0f, 1.0f), Random.Range (0.0f, 1.0f));
            } 
            else 
            {
                myLight.GetComponent<Light>().color = myScriptableObject.thisColor;
            }
            myLights.Add (myLight.GetComponent<Light>());
        }
    }

    // Update is called once per frame
    void Update () {
        if (Input.GetButtonDown ("Fire1")) 
        {
            foreach (Light light in myLights) 
            {
                light.enabled = !light.enabled;
            }
        }
        if (Input.GetButtonDown("Fire2"))
        {
            UpdateLights();
        }

    }

    void UpdateLights () 
    {
        foreach (var myLight in myLights)
        {
            myLight.color = new Color(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f));
        }
    }
}

using UnityEngine;
using System.Collections;
using UnityEditor;

public class MakeScriptableObject {
    [MenuItem("Assets/Create/My Scriptable Object")]
    public static void CreateMyAsset()
    {
        MyScriptableObjectClass asset = ScriptableObject.CreateInstance<MyScriptableObjectClass>();

        AssetDatabase.CreateAsset(asset, "Assets/NewScripableObject.asset");
        AssetDatabase.SaveAssets();

        EditorUtility.FocusProjectWindow();

        Selection.activeObject = asset;
    }
}

using UnityEngine;
using System.Collections;

[System.Serializable]                         //    Our Representation of an InventoryItem
public class InventoryItem 
{
    public string itemName = "New Item";      //    What the item will be called in the inventory
    public Texture2D itemIcon = null;         //    What the item will look like in the inventory
    public Rigidbody itemObject = null;       //    Optional slot for a PreFab to instantiate when discarding
    public bool isUnique = false;             //    Optional checkbox to indicate that there should only be one of these items per game
    public bool isIndestructible = false;     //    Optional checkbox to prevent an item from being destroyed by the player (unimplemented)
    public bool isQuestItem = false;          //    Examples of additional information that could be held in InventoryItem
    public bool isStackable = false;          //    Examples of additional information that could be held in InventoryItem
    public bool destroyOnUse = false;         //    Examples of additional information that could be held in InventoryItem
    public float encumbranceValue = 0;        //    Examples of additional information that could be held in InventoryItem  !!!
}

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class InventoryItemList : ScriptableObject 
{
    public List<InventoryItem> itemList;
}

using UnityEngine;
using UnityEditor;
using System.Collections;
using System.Collections.Generic;

public class InventoryItemEditor : EditorWindow {

    public InventoryItemList inventoryItemList;
    private int viewIndex = 1;

    [MenuItem ("Window/Inventory Item Editor %#e")]
    static void  Init () 
    {
        EditorWindow.GetWindow (typeof (InventoryItemEditor));
    }

    void  OnEnable () {
        if(EditorPrefs.HasKey("ObjectPath")) 
        {
            string objectPath = EditorPrefs.GetString("ObjectPath");
            inventoryItemList = AssetDatabase.LoadAssetAtPath (objectPath, typeof(InventoryItemList)) as InventoryItemList;
        }

    }

    void  OnGUI () {
        GUILayout.BeginHorizontal ();
        GUILayout.Label ("Inventory Item Editor", EditorStyles.boldLabel);
        if (inventoryItemList != null) {
            if (GUILayout.Button("Show Item List")) 
            {
                EditorUtility.FocusProjectWindow();
                Selection.activeObject = inventoryItemList;
            }
        }
        if (GUILayout.Button("Open Item List")) 
        {
                OpenItemList();
        }
        if (GUILayout.Button("New Item List")) 
        {
            EditorUtility.FocusProjectWindow();
            Selection.activeObject = inventoryItemList;
        }
        GUILayout.EndHorizontal ();

        if (inventoryItemList == null) 
        {
            GUILayout.BeginHorizontal ();
            GUILayout.Space(10);
            if (GUILayout.Button("Create New Item List", GUILayout.ExpandWidth(false))) 
            {
                CreateNewItemList();
            }
            if (GUILayout.Button("Open Existing Item List", GUILayout.ExpandWidth(false))) 
            {
                OpenItemList();
            }
            GUILayout.EndHorizontal ();
        }

            GUILayout.Space(20);

        if (inventoryItemList != null) 
        {
            GUILayout.BeginHorizontal ();

            GUILayout.Space(10);

            if (GUILayout.Button("Prev", GUILayout.ExpandWidth(false))) 
            {
                if (viewIndex > 1)
                    viewIndex --;
            }
            GUILayout.Space(5);
            if (GUILayout.Button("Next", GUILayout.ExpandWidth(false))) 
            {
                if (viewIndex < inventoryItemList.itemList.Count) 
                {
                    viewIndex ++;
                }
            }

            GUILayout.Space(60);

            if (GUILayout.Button("Add Item", GUILayout.ExpandWidth(false))) 
            {
                AddItem();
            }
            if (GUILayout.Button("Delete Item", GUILayout.ExpandWidth(false))) 
            {
                DeleteItem(viewIndex - 1);
            }

            GUILayout.EndHorizontal ();
            if (inventoryItemList.itemList == null)
                Debug.Log("Inventory is empty");
            if (inventoryItemList.itemList.Count > 0) 
            {
                GUILayout.BeginHorizontal ();
                viewIndex = Mathf.Clamp (EditorGUILayout.IntField ("Current Item", viewIndex, GUILayout.ExpandWidth(false)), 1, inventoryItemList.itemList.Count);
                //Mathf.Clamp (viewIndex, 1, inventoryItemList.itemList.Count);
                EditorGUILayout.LabelField ("of   " +  inventoryItemList.itemList.Count.ToString() + "  items", "", GUILayout.ExpandWidth(false));
                GUILayout.EndHorizontal ();

                inventoryItemList.itemList[viewIndex-1].itemName = EditorGUILayout.TextField ("Item Name", inventoryItemList.itemList[viewIndex-1].itemName as string);
                inventoryItemList.itemList[viewIndex-1].itemIcon = EditorGUILayout.ObjectField ("Item Icon", inventoryItemList.itemList[viewIndex-1].itemIcon, typeof (Texture2D), false) as Texture2D;
                inventoryItemList.itemList[viewIndex-1].itemObject = EditorGUILayout.ObjectField ("Item Object", inventoryItemList.itemList[viewIndex-1].itemObject, typeof (Rigidbody), false) as Rigidbody;

                GUILayout.Space(10);

                GUILayout.BeginHorizontal ();
                inventoryItemList.itemList[viewIndex-1].isUnique = (bool)EditorGUILayout.Toggle("Unique", inventoryItemList.itemList[viewIndex-1].isUnique, GUILayout.ExpandWidth(false));
                inventoryItemList.itemList[viewIndex-1].isIndestructible = (bool)EditorGUILayout.Toggle("Indestructable", inventoryItemList.itemList[viewIndex-1].isIndestructible,  GUILayout.ExpandWidth(false));
                inventoryItemList.itemList[viewIndex-1].isQuestItem = (bool)EditorGUILayout.Toggle("QuestItem", inventoryItemList.itemList[viewIndex-1].isQuestItem,  GUILayout.ExpandWidth(false));
                GUILayout.EndHorizontal ();

                GUILayout.Space(10);

                GUILayout.BeginHorizontal ();
                inventoryItemList.itemList[viewIndex-1].isStackable = (bool)EditorGUILayout.Toggle("Stackable ", inventoryItemList.itemList[viewIndex-1].isStackable , GUILayout.ExpandWidth(false));
                inventoryItemList.itemList[viewIndex-1].destroyOnUse = (bool)EditorGUILayout.Toggle("Destroy On Use", inventoryItemList.itemList[viewIndex-1].destroyOnUse,  GUILayout.ExpandWidth(false));
                inventoryItemList.itemList[viewIndex-1].encumbranceValue = EditorGUILayout.FloatField("Encumberance", inventoryItemList.itemList[viewIndex-1].encumbranceValue,  GUILayout.ExpandWidth(false));
                GUILayout.EndHorizontal ();

                GUILayout.Space(10);

            } 
            else 
            {
                GUILayout.Label ("This Inventory List is Empty.");
            }
        }
        if (GUI.changed) 
        {
            EditorUtility.SetDirty(inventoryItemList);
        }
    }

    void CreateNewItemList () 
    {
        // There is no overwrite protection here!
        // There is No "Are you sure you want to overwrite your existing object?" if it exists.
        // This should probably get a string from the user to create a new name and pass it ...
        viewIndex = 1;
        inventoryItemList = CreateInventoryItemList.Create();
        if (inventoryItemList) 
        {
            inventoryItemList.itemList = new List<InventoryItem>();
            string relPath = AssetDatabase.GetAssetPath(inventoryItemList);
            EditorPrefs.SetString("ObjectPath", relPath);
        }
    }

    void OpenItemList () 
    {
        string absPath = EditorUtility.OpenFilePanel ("Select Inventory Item List", "", "");
        if (absPath.StartsWith(Application.dataPath)) 
        {
            string relPath = absPath.Substring(Application.dataPath.Length - "Assets".Length);
            inventoryItemList = AssetDatabase.LoadAssetAtPath (relPath, typeof(InventoryItemList)) as InventoryItemList;
            if (inventoryItemList.itemList == null)
                inventoryItemList.itemList = new List<InventoryItem>();
            if (inventoryItemList) {
                EditorPrefs.SetString("ObjectPath", relPath);
            }
        }
    }

    void AddItem () 
    {
        InventoryItem newItem = new InventoryItem();
        newItem.itemName = "New Item";
        inventoryItemList.itemList.Add (newItem);
        viewIndex = inventoryItemList.itemList.Count;
    }

    void DeleteItem (int index) 
    {
        inventoryItemList.itemList.RemoveAt (index);
    }
}

using UnityEngine;
using System.Collections;
using UnityEditor;

public class CreateInventoryItemList {
    [MenuItem("Assets/Create/Inventory Item List")]
    public static InventoryItemList  Create()
    {
        InventoryItemList asset = ScriptableObject.CreateInstance<InventoryItemList>();

        AssetDatabase.CreateAsset(asset, "Assets/InventoryItemList.asset");
        AssetDatabase.SaveAssets();
        return asset;
    }
}