Merge pull request #33 from mackysoft/fix/custom-property-drawer-not-…

…applied

WIP:Fix `CustomPropertyDrawer` not applied

Assets/Example/Example.cs

@@ -0,0 +1,120 @@
+#if UNITY_2019_3_OR_NEWER
+using System.Collections.Generic;
+using System;
+using UnityEditor;
+using UnityEngine;
+
+[Serializable]
+public abstract class Food
+{
+	public string name;
+
+	public float 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;
+	}
+}
+
+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();
+
+	[SerializeReference, SubclassSelector]
+	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()
+	};
+}
+
+#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
+
+#endif