Added PredrawerModifier to help modify either SerializedProperty or GUIContent before drawing

Editor/AbstractPropertyDrawer.cs

@@ -15,8 +15,16 @@ namespace Module.Inspector.Editor
                 return;
 
             label.tooltip = result.tooltip;
+            
+            for (var i = 0; i < result.predrawerModifiers.Count; i++)
+            {
+                EditorPropertyUtility.ResultValue<PredrawerModifierPropertyAttribute, PredrawerModifierPropertyDrawer> value = result.predrawerModifiers[i];
+                value.drawer.Modify(value.attribute, property, label);
+            }
+
             bool prevEnabled = GUI.enabled;
             GUI.enabled = accessType == EAccessType.Enabled;
+            // TODO: What to do with [Obsolete]?
 
             if (result.draw != null)
             {
@@ -50,7 +58,7 @@ namespace Module.Inspector.Editor
             return accessType != EAccessType.Hidden ? EditorGUI.GetPropertyHeight(property, label) : 0.0f;
         }
 
-        private EAccessType GetAccessType(SerializedProperty property, EditorPropertyUtility.Result result)
+        private static EAccessType GetAccessType(SerializedProperty property, EditorPropertyUtility.Result result)
         {
             if (result.accessModifiers.Count == 0)
                 return EAccessType.Enabled;

Editor/PredrawerModifierPropertyDrawer.cs

@@ -0,0 +1,10 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace Module.Inspector.Editor
+{
+    public abstract class PredrawerModifierPropertyDrawer : AbstractPropertyDrawer
+    {
+        public abstract void Modify(PredrawerModifierPropertyAttribute attribute, SerializedProperty property, GUIContent label);
+    }
+}

Editor/PredrawerModifierPropertyDrawer.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 5a747366f0b24cf89b7ebfd2108468f7
+timeCreated: 1638612780

Editor/Utilities/EditorPropertyUtility.cs

@@ -37,7 +37,12 @@ namespace Module.Inspector.Editor.Utilities
 
                     for (var k = 0; k < arguments.Count; k++)
                     {
-                        if (arguments[k].Value is Type argType)
+                        if (!(arguments[k].Value is Type argType))
+                            continue;
+
+                        if (CACHED_ATT_TO_DRAWER.ContainsKey(argType))
+                            Debug.LogWarningFormat("Already contained {0}, but tried to add with {1} and already had {2}.", argType, type, CACHED_ATT_TO_DRAWER[argType]);
+                        else
                             CACHED_ATT_TO_DRAWER.Add(argType, type);
                     }
                 }
@@ -67,6 +72,7 @@ namespace Module.Inspector.Editor.Utilities
             if (typeDrawer != null)
                 drawer = new ResultValue<DrawerPropertyAttribute, DrawerPropertyDrawer>(null, typeDrawer);
 
+            var predrawerModifiers = new List<ResultValue<PredrawerModifierPropertyAttribute, PredrawerModifierPropertyDrawer>>(2);
             var valueModifiers = new List<ResultValue<ValueModifierPropertyAttribute, ValueModifierPropertyDrawer>>(2);
             var accessModifiers = new List<ResultValue<AccessModifierPropertyAttribute, AccessModifierPropertyDrawer>>(2);
             object[] attributes = fieldInfo.GetCustomAttributes(false);
@@ -88,6 +94,13 @@ namespace Module.Inspector.Editor.Utilities
                     if (prop != null)
                         drawer = new ResultValue<DrawerPropertyAttribute, DrawerPropertyDrawer>(attDrawer, prop);
                 }
+                else if (att is PredrawerModifierPropertyAttribute predawerModifier)
+                {
+                    var prop = InternalCreateInstanceOf<PredrawerModifierPropertyDrawer>(predawerModifier);
+                    
+                    if (prop != null)
+                        predrawerModifiers.Add(new ResultValue<PredrawerModifierPropertyAttribute, PredrawerModifierPropertyDrawer>(predawerModifier, prop));
+                }
                 else if (att is ValueModifierPropertyAttribute valueModifier)
                 {
                     var prop = InternalCreateInstanceOf<ValueModifierPropertyDrawer>(valueModifier);
@@ -121,7 +134,7 @@ namespace Module.Inspector.Editor.Utilities
                     tooltip = $"Obsolete: {obsoleteText}";
             }
             
-            return new Result(drawer, valueModifiers, accessModifiers, tooltip, isObsolete);
+            return new Result(drawer, predrawerModifiers, valueModifiers, accessModifiers, tooltip, isObsolete);
         }
 
         private static T InternalCreateInstanceOf<T>(AbstractPropertyAttribute att) where T : AbstractPropertyDrawer
@@ -146,23 +159,37 @@ namespace Module.Inspector.Editor.Utilities
         public sealed class Result
         {
             public readonly ResultValue<DrawerPropertyAttribute, DrawerPropertyDrawer> draw;
+            public readonly List<ResultValue<PredrawerModifierPropertyAttribute, PredrawerModifierPropertyDrawer>> predrawerModifiers;
             public readonly List<ResultValue<ValueModifierPropertyAttribute, ValueModifierPropertyDrawer>> valueModifiers;
             public readonly List<ResultValue<AccessModifierPropertyAttribute, AccessModifierPropertyDrawer>> accessModifiers;
             public readonly string tooltip;
             public readonly bool isObsolete;
 
             public Result(ResultValue<DrawerPropertyAttribute, DrawerPropertyDrawer> draw,
+                          List<ResultValue<PredrawerModifierPropertyAttribute, PredrawerModifierPropertyDrawer>> predrawerModifiers,
                           List<ResultValue<ValueModifierPropertyAttribute, ValueModifierPropertyDrawer>> valueModifiers,
                           List<ResultValue<AccessModifierPropertyAttribute, AccessModifierPropertyDrawer>> accessModifiers,
                           string tooltip,
                           bool isObsolete)
             {
                 this.draw = draw;
+                this.predrawerModifiers = predrawerModifiers;
                 this.valueModifiers = valueModifiers;
                 this.accessModifiers = accessModifiers;
                 this.tooltip = tooltip;
                 this.isObsolete = isObsolete;
             }
+            
+            public T GetPredrawerModifier<T>() where T : PredrawerModifierPropertyAttribute
+            {
+                for (var i = 0; i < predrawerModifiers.Count; i++)
+                {
+                    if (predrawerModifiers[i].attribute is T att)
+                        return att;
+                }
+
+                return null;
+            }
 
             public T GetValueModifier<T>() where T : ValueModifierPropertyAttribute
             {

Runtime/Enums/EPropertyType.cs

@@ -2,6 +2,7 @@
 {
     public enum EPropertyType : byte
     {
+        PredrawerModifier,
         Drawer,
         ValueModifier,
         AccessModifier

Runtime/PredrawerModifierPropertyAttribute.cs

@@ -0,0 +1,7 @@
+namespace Module.Inspector
+{
+    public abstract class PredrawerModifierPropertyAttribute : AbstractPropertyAttribute
+    {
+        public override EPropertyType Type => EPropertyType.PredrawerModifier;
+    }
+}

Runtime/PredrawerModifierPropertyAttribute.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 54936da91a3241debe62f6fe4269f129
+timeCreated: 1638612653