add ColLayoutConverter

src/Shared/HandyControl_Shared/Tools/Extension/ColLayout.cs

@@ -1,9 +1,14 @@
 using System;
+using System.ComponentModel;
+using System.Globalization;
+using System.Text;
 using System.Windows.Markup;
 using HandyControl.Data;
+using HandyControl.Tools.Converter;
 
 namespace HandyControl.Tools.Extension
 {
+    [TypeConverter(typeof(ColLayoutConverter))]
     public class ColLayout : MarkupExtension
     {
         public static readonly int ColMaxCellCount = 24;
@@ -30,6 +35,31 @@ namespace HandyControl.Tools.Extension
 
         public int Xxl { get; set; } = 2;
 
+        public ColLayout()
+        {
+            
+        }
+
+        public ColLayout(int uniformWidth)
+        {
+            Xs = uniformWidth;
+            Sm = uniformWidth;
+            Md = uniformWidth;
+            Lg = uniformWidth;
+            Xl = uniformWidth;
+            Xxl = uniformWidth;
+        }
+
+        public ColLayout(int xs, int sm, int md, int lg, int xl, int xxl)
+        {
+            Xs = xs;
+            Sm = sm;
+            Md = md;
+            Lg = lg;
+            Xl = xl;
+            Xxl = xxl;
+        }
+
         public override object ProvideValue(IServiceProvider serviceProvider)
         {
             return new ColLayout
@@ -67,5 +97,29 @@ namespace HandyControl.Tools.Extension
             }
             return ColLayoutStatus.Xxl;
         }
+
+        public override string ToString()
+        {
+            var cultureInfo = CultureInfo.CurrentCulture;
+            var listSeparator = TokenizerHelper.GetNumericListSeparator(cultureInfo);
+
+            // Initial capacity [128] is an estimate based on a sum of:
+            // 72 = 6x double (twelve digits is generous for the range of values likely)
+            //  4 = 4x separator characters
+            var sb = new StringBuilder(128);
+
+            sb.Append(Xs.ToString(cultureInfo));
+            sb.Append(listSeparator);
+            sb.Append(Sm.ToString(cultureInfo));
+            sb.Append(listSeparator);
+            sb.Append(Md.ToString(cultureInfo));
+            sb.Append(listSeparator);
+            sb.Append(Lg.ToString(cultureInfo));
+            sb.Append(listSeparator);
+            sb.Append(Xl.ToString(cultureInfo));
+            sb.Append(listSeparator);
+            sb.Append(Xxl.ToString(cultureInfo));
+            return sb.ToString();
+        }
     }
 }