fead.圆角，终于统一

LanMountainDesktop.Settings.Core/GlobalAppearanceSettings.cs

@@ -2,17 +2,69 @@ namespace LanMountainDesktop.Settings.Core;
 
 public static class GlobalAppearanceSettings
 {
+    public const string CornerRadiusStyleSharp = "Sharp";
+    public const string CornerRadiusStyleBalanced = "Balanced";
+    public const string CornerRadiusStyleRounded = "Rounded";
+    public const string CornerRadiusStyleOpen = "Open";
+    public const string DefaultCornerRadiusStyle = CornerRadiusStyleBalanced;
+
+    /// <summary>
+    /// Kept for backward compatibility during settings migration.
+    /// New code should not reference this constant.
+    /// </summary>
     public const double DefaultCornerRadiusScale = 1.0;
     public const double MinimumCornerRadiusScale = 0.0;
-    public const double MaximumCornerRadiusScale = 2.50;
 
-    public static double NormalizeCornerRadiusScale(double value)
+    public static string NormalizeCornerRadiusStyle(string? value)
     {
-        if (double.IsNaN(value) || double.IsInfinity(value))
+        if (string.IsNullOrWhiteSpace(value))
         {
-            return DefaultCornerRadiusScale;
+            return DefaultCornerRadiusStyle;
         }
 
-        return Math.Clamp(value, MinimumCornerRadiusScale, MaximumCornerRadiusScale);
+        var trimmed = value.Trim();
+        if (string.Equals(trimmed, CornerRadiusStyleSharp, StringComparison.OrdinalIgnoreCase))
+        {
+            return CornerRadiusStyleSharp;
+        }
+
+        if (string.Equals(trimmed, CornerRadiusStyleBalanced, StringComparison.OrdinalIgnoreCase))
+        {
+            return CornerRadiusStyleBalanced;
+        }
+
+        if (string.Equals(trimmed, CornerRadiusStyleRounded, StringComparison.OrdinalIgnoreCase))
+        {
+            return CornerRadiusStyleRounded;
+        }
+
+        if (string.Equals(trimmed, CornerRadiusStyleOpen, StringComparison.OrdinalIgnoreCase))
+        {
+            return CornerRadiusStyleOpen;
+        }
+
+        return DefaultCornerRadiusStyle;
+    }
+
+    public static readonly IReadOnlyList<string> AllCornerRadiusStyles =
+    [
+        CornerRadiusStyleSharp,
+        CornerRadiusStyleBalanced,
+        CornerRadiusStyleRounded,
+        CornerRadiusStyleOpen
+    ];
+
+    /// <summary>
+    /// Backward compatibility: map previous scale values to the closest style.
+    /// </summary>
+    public static string MigrateScaleToStyle(double scale)
+    {
+        return scale switch
+        {
+            <= 0.60 => CornerRadiusStyleSharp,
+            <= 1.20 => CornerRadiusStyleBalanced,
+            <= 1.70 => CornerRadiusStyleRounded,
+            _ => CornerRadiusStyleOpen
+        };
     }
 }