UniVRM/Scripts/Meta/Editor/VRMMetaEditor.cs

using UnityEditor;
using UnityEngine;


namespace VRM
{
    [CustomEditor(typeof(VRMMeta))]
    public class VRMMetaEditor : Editor
    {
        SerializedProperty m_ScriptProp;
        SerializedProperty m_VRMMetaObjectProp;

        private void OnEnable()
        {
            m_ScriptProp = serializedObject.FindProperty("m_Script");
            m_VRMMetaObjectProp = serializedObject.FindProperty("Meta");
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();

            EditorGUILayout.PropertyField(m_ScriptProp, true);
            EditorGUILayout.PropertyField(m_VRMMetaObjectProp, true);

            EditorGUILayout.Space();

            if (m_VRMMetaObjectProp.objectReferenceValue != null)
            {
                VRMMetaObjectGUI(new SerializedObject(m_VRMMetaObjectProp.objectReferenceValue));
            }

            serializedObject.ApplyModifiedProperties();
        }

        void VRMMetaObjectGUI(SerializedObject so)
        {
            so.Update();

            int i = 0;
            for (SerializedProperty iterator = so.GetIterator();
                iterator.NextVisible(true);
                ++i
                )
            {
                if (i == 0) continue;

                /*
                Debug.LogFormat("{0}: {1}({2}) = {3}",
                    iterator.depth,
                    iterator.name,
                    iterator.displayName,
                    iterator.propertyType
                    );
                    */
                if (iterator.name == "Thumbnail")
                {
                    iterator.objectReferenceValue=TextureField(iterator.name, (Texture2D)iterator.objectReferenceValue, 100);
                }
                else {
                    EditorGUILayout.PropertyField(iterator, false);
                }
            }

            so.ApplyModifiedProperties();
        }

        private static Texture2D TextureField(string name, Texture2D texture, int size)
        {
            GUILayout.BeginHorizontal();
            var style = new GUIStyle(GUI.skin.label);
            style.alignment = TextAnchor.UpperCenter;
            //style.fixedWidth = size;
            GUILayout.Label(name, style);
            var result = (Texture2D)EditorGUILayout.ObjectField(texture, typeof(Texture2D), false, GUILayout.Width(size), GUILayout.Height(size));
            GUILayout.EndVertical();
            return result;
        }
    }
}