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

README.md

@@ -121,6 +121,8 @@ List of all value attributes:
     * If value is less than min value, then set value to min value 
 * `SmallerThanField`
     * If value is less than other fields value, then set value to other fields value
+* `AssignIfNull`
+    * If value is null will either use field or custom type to get from self or children 
 
 
 ## Validate

Runtime/ValueModifiers/AssignIfNullAttribute.cs

@@ -0,0 +1,36 @@
+using System;
+
+namespace Module.Inspector
+{
+    [AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = true)]
+    public sealed class AssignIfNullAttribute : ValueModifierPropertyAttribute
+    {
+        public readonly bool useType;
+        public readonly Type type;
+        public readonly bool includeChildren;
+
+        public AssignIfNullAttribute()
+        {
+            useType = false;
+        }
+
+        public AssignIfNullAttribute(bool includeChildren)
+        {
+            useType = false;
+            this.includeChildren = includeChildren;
+        }
+
+        public AssignIfNullAttribute(Type type)
+        {
+            this.type = type;
+            useType = true;
+        }
+
+        public AssignIfNullAttribute(Type type, bool includeChildren)
+        {
+            this.type = type;
+            this.includeChildren = includeChildren;
+            useType = true;
+        }
+    }
+}

Runtime/ValueModifiers/AssignIfNullAttribute.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: dfd8ecaea012b084f994832dd519d850
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "com.module.inspector",
-  "version": "1.1.1",
+  "version": "1.2.0",
   "displayName": "Module.Inspector",
   "description": "Custom inspector with various useful property drawers",
   "unity": "2019.2",