1.2.0: Added AssignIfNull which allows for fields to get components from self or children

Editor/ValueModifiers/AssignIfNullAttributeDrawer.cs

@@ -0,0 +1,39 @@
+using System;
+using UnityEditor;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+namespace Module.Inspector.Editor
+{
+    [CustomPropertyDrawer(typeof(AssignIfNullAttribute))]
+    internal sealed class AssignIfNullAttributeDrawer : ValueModifierPropertyDrawer
+    {
+        public override void Modify(ValueModifierPropertyAttribute attribute, SerializedProperty property)
+        {
+            if (property.propertyType != SerializedPropertyType.ObjectReference)
+                return;
+            if (property.objectReferenceValue != null)
+                return;
+            
+            var att = (AssignIfNullAttribute)attribute;
+            Type type = att.useType ? att.type : property.GetValueType();
+
+            if (!typeof(Component).IsAssignableFrom(type))
+                return;
+
+            for (var i = 0; i < property.serializedObject.targetObjects.Length; i++)
+            {
+                Object obj = property.serializedObject.targetObjects[i];
+
+                if (!(obj is Component component))
+                    continue;
+
+                Component c = att.includeChildren 
+                                  ? component.gameObject.GetComponentInChildren(type) 
+                                  : component.gameObject.GetComponent(type);
+
+                property.objectReferenceValue = c;
+            }
+        }
+    }
+}

Editor/ValueModifiers/AssignIfNullAttributeDrawer.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: e029b0d7c1384ab2b961e74a2bf23fe0
+timeCreated: 1638695373