Add Dropdown values validation

Editor.Extras/Validators/DropdownValidator.cs

@@ -0,0 +1,52 @@
+using TriInspector;
+using TriInspector.Resolvers;
+using TriInspector.Validators;
+
+[assembly: RegisterTriAttributeValidator(typeof(DropdownValidator<>))]
+
+namespace TriInspector.Validators
+{
+    public class DropdownValidator<T> : TriAttributeValidator<DropdownAttribute>
+    {
+        private DropdownValuesResolver<T> _valuesResolver;
+
+        public override TriExtensionInitializationResult Initialize(TriPropertyDefinition propertyDefinition)
+        {
+            _valuesResolver = DropdownValuesResolver<T>.Resolve(propertyDefinition, Attribute.Values);
+
+            if (_valuesResolver.TryGetErrorString(out var error))
+            {
+                return error;
+            }
+
+            return TriExtensionInitializationResult.Ok;
+        }
+
+        public override TriValidationResult Validate(TriProperty property)
+        {
+            foreach (var item in _valuesResolver.GetDropdownItems(property))
+            {
+                if (property.Comparer.Equals(item.Value, property.Value))
+                {
+                    return TriValidationResult.Valid;
+                }
+            }
+
+            var msg = $"Dropdown value '{property.Value}' not valid";
+
+            switch (Attribute.ValidationMessageType)
+            {
+                case TriMessageType.Info:
+                    return TriValidationResult.Info(msg);
+
+                case TriMessageType.Warning:
+                    return TriValidationResult.Warning(msg);
+
+                case TriMessageType.Error:
+                    return TriValidationResult.Error(msg);
+            }
+
+            return TriValidationResult.Valid;
+        }
+    }
+}

Editor.Extras/Validators/DropdownValidator.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 22bd6d63410f4a7ba8564e185844ddbf
+timeCreated: 1680714123

Runtime/Attributes/DropdownAttribute.cs

@@ -9,6 +9,8 @@ namespace TriInspector
     {
         public string Values { get; }
 
+        public TriMessageType ValidationMessageType { get; set; } = TriMessageType.Error;
+
         public DropdownAttribute(string values)
         {
             Values = values;

Runtime/TriValidationResult.cs

@@ -15,6 +15,11 @@
         public string Message { get; }
         public TriMessageType MessageType { get; }
 
+        public static TriValidationResult Info(string error)
+        {
+            return new TriValidationResult(false, error, TriMessageType.Info);
+        }
+        
         public static TriValidationResult Error(string error)
         {
             return new TriValidationResult(false, error, TriMessageType.Error);