add

Assets/CoolapeFrame/3rd/UnityEditorHelper/Attributes/LimitAttribute.cs

@@ -0,0 +1,41 @@
+using System;
+using UnityEngine;
+
+namespace UnityEditorHelper
+{
+    public class LimitAttribute : PropertyAttribute
+    {
+        public enum Mode { LimitLower, LimitUpper, LimitBoth }
+
+        private readonly Mode _limitMode;
+
+        private readonly int _lowerLimit;
+        private readonly int _upperLimit;
+
+        public LimitAttribute(int lowerLimit) : this(Mode.LimitLower, lowerLimit, int.MaxValue) { }
+
+        public LimitAttribute(int lowerLimit, int upperLimit) : this(Mode.LimitLower, lowerLimit, upperLimit) { }
+
+        private LimitAttribute(Mode mode, int lowerLimit, int upperLimit)
+        {
+            _limitMode = mode;
+            _lowerLimit = lowerLimit;
+            _upperLimit = upperLimit;
+        }
+
+        public int Limit(int value)
+        {
+            switch (_limitMode)
+            {
+                case Mode.LimitLower:
+                    return Mathf.Clamp(value, _lowerLimit, int.MaxValue);
+                case Mode.LimitUpper:
+                    return Mathf.Clamp(value, int.MinValue, _upperLimit);
+                case Mode.LimitBoth:
+                    return Mathf.Clamp(value, _lowerLimit, _upperLimit);
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+    }
+}