Add UI Value Validators

Data/DoubleLimit.cs

@@ -0,0 +1,78 @@
+namespace ADOFAIRenderer.Data
+{
+    /// <summary>
+    /// Base class for double input validation limits.
+    /// Multiple limits can be composed on a single input field — all are checked in order.
+    /// </summary>
+    public abstract class DoubleLimit
+    {
+        /// <summary>
+        /// Validates the given double value against this limit.
+        /// </summary>
+        /// <param name="value">The parsed double value to validate.</param>
+        /// <param name="errorMessage">
+        /// When validation fails, set to a human-readable error message.
+        /// When validation succeeds, set to null.
+        /// </param>
+        /// <returns>true if the value satisfies this limit; false otherwise.</returns>
+        public abstract bool Validate(double value, out string errorMessage);
+    }
+
+    /// <summary>
+    /// Requires the double value to be strictly positive (> 0).
+    /// </summary>
+    public class PositiveOnlyDoubleLimit : DoubleLimit
+    {
+        public override bool Validate(double value, out string errorMessage)
+        {
+            if (value > 0)
+            {
+                errorMessage = null!;
+                return true;
+            }
+
+            errorMessage = "값은 0보다 큰 양수여야 합니다.";
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Requires the double value to be within an inclusive [Min, Max] range.
+    /// Either bound can be null to represent an unbounded side.
+    /// </summary>
+    public class RangeDoubleLimit : DoubleLimit
+    {
+        public double? Min { get; }
+        public double? Max { get; }
+
+        /// <param name="min">Inclusive lower bound, or null for no lower bound.</param>
+        /// <param name="max">Inclusive upper bound, or null for no upper bound.</param>
+        public RangeDoubleLimit(double? min, double? max)
+        {
+            Min = min;
+            Max = max;
+        }
+
+        public override bool Validate(double value, out string errorMessage)
+        {
+            if (Min.HasValue && value < Min.Value)
+            {
+                errorMessage = Max.HasValue
+                    ? $"값은 {Min.Value}에서 {Max.Value} 사이의 숫자여야 합니다."
+                    : $"값은 {Min.Value} 이상의 숫자여야 합니다.";
+                return false;
+            }
+
+            if (Max.HasValue && value > Max.Value)
+            {
+                errorMessage = Min.HasValue
+                    ? $"값은 {Min.Value}에서 {Max.Value} 사이의 숫자여야 합니다."
+                    : $"값은 {Max.Value} 이하의 숫자여야 합니다.";
+                return false;
+            }
+
+            errorMessage = null!;
+            return true;
+        }
+    }
+}