Unity-SerializeReferenceExtensions/Assets/Example/Example.cs at 3cd27935a63c668d3e54bd5d82eb55b5481eb343 · mackysoft/Unity-SerializeReferenceExtensions · GitHub

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

[Serializable]
public abstract class Food
{
    public string name;

    public float kcal;

    public override string ToString () => $"{name} ({kcal} kcal)";
}

[Serializable]
public class Apple : Food
{
    public Apple ()
    {
        name = "Apple";
        kcal = 100f;
    }
}

[Serializable]
public class Peach : Food
{
    public Peach ()
    {
        name = "Peach";
        kcal = 100f;
    }
}

[Serializable]
public class Grape : Food
{
    public Grape ()
    {
        name = "Grape";
        kcal = 100f;
    }
}

[Serializable]
[HideInTypeMenu]
public class Banana : Food
{
    public Banana ()
    {
        name = "Banana";
        kcal = 100f;
    }
}

public class Example : MonoBehaviour
{

    [SerializeReference]
    public Food food1 = new Apple();

    [SerializeReference]
    public Food food2 = new Peach();

    [SerializeReference]
    public Food food3 = new Grape();

    [SerializeReference, SubclassSelector]
    public Food foodOne = new Apple();

    [SerializeReference, SubclassSelector]
    public Food foodTwo = new Peach();

    // UseToStringAsLabel support on UNITY_2021_3_OR_NEWER
    [SerializeReference, SubclassSelector(UseToStringAsLabel = true)]
    public Food foodThree = new Grape();

    [SerializeReference]
    public List<Food> foodsOne = new List<Food>
    {
        new Apple(),
        new Peach(),
        new Grape()
    };

    [SerializeReference, SubclassSelector]
    public List<Food> foodsTwo = new List<Food>
    {
        new Apple(),
        new Peach(),
        new Grape()
    };

    // UseToStringAsLabel support on UNITY_2021_3_OR_NEWER
    [SerializeReference, SubclassSelector(UseToStringAsLabel = true)]
    public List<Food> foodsThree = new List<Food>
    {
        new Apple(),
        new Peach(),
        new Grape()
    };
}

#if UNITY_EDITOR

/// These classes are in a folder named "Editor" in the project

[CustomPropertyDrawer(typeof(Peach), true)]
public class PeachDrawer : PropertyDrawer
{
    public override void OnGUI (Rect position, SerializedProperty property, GUIContent label)
    {
        position.height = EditorGUIUtility.singleLineHeight;
        EditorGUI.PropertyField(position, property.FindPropertyRelative("name"));

        position.y += EditorGUIUtility.singleLineHeight + EditorGUIUtility.standardVerticalSpacing;
        EditorGUI.PropertyField(position, property.FindPropertyRelative("kcal"));
    }

    public override float GetPropertyHeight (SerializedProperty property, GUIContent label)
    {
        return EditorGUIUtility.singleLineHeight * 2 + EditorGUIUtility.standardVerticalSpacing * 1;
    }
}

[CustomPropertyDrawer(typeof(Apple), true)]
public class AppleDrawer : PropertyDrawer
{
    public override void OnGUI (Rect position, SerializedProperty property, GUIContent label)
    {
        EditorGUI.LabelField(position, "I'm an apple!");
    }

    public override float GetPropertyHeight (SerializedProperty property, GUIContent label)
    {
        return EditorGUIUtility.singleLineHeight;
    }
}
#endif