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Assets/ABI.CCK/Scripts/Editor/ReadOnlyDrawer.cs

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+using UnityEditor;
+using UnityEngine;
+
+
+/// <summary>
+/// This class contain custom drawer for ReadOnly attribute.
+/// </summary>
+[CustomPropertyDrawer(typeof(ReadOnlyAttribute))]
+public class ReadOnlyDrawer : PropertyDrawer
+{
+    /// <summary>
+    /// Unity method for drawing GUI in Editor
+    /// </summary>
+    /// <param name="position">Position.</param>
+    /// <param name="property">Property.</param>
+    /// <param name="label">Label.</param>
+    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+    {
+        // Saving previous GUI enabled value
+        var previousGUIState = GUI.enabled;
+        // Disabling edit for property
+        GUI.enabled = false;
+        // Drawing Property
+        EditorGUI.PropertyField(position, property, label);
+        // Setting old GUI enabled value
+        GUI.enabled = previousGUIState;
+    }
+}