Add ability to show image markers.

PortfolioManager/UIUtils/UIUtils.cs

@@ -1,19 +1,48 @@
 using System;
 using System.Collections.Generic;
-using System.Collections.ObjectModel;
 using Avalonia.Data.Converters;
 using MarketData.MarketDataModel;
 using MarketData.Utils;
 
 namespace PortfolioManager.UIUtils
 {
+
+  /// <summary>
+  /// If the OS is not Window then multiply the first parameter.
+  /// For example:  "30|.5" would multiply 30 * .5 if the OS is not Windows and return 15 as the result.  Otherwise (if Windows) it will return 30
+  /// I am doing this because I need to adjust image sizes across Windows and Unix platforms where Unix images appear quite larger than Windows
+  /// </summary>
+  public class OSValueConverter : IValueConverter
+  {
+    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+    {
+      String[] parameters = parameter.ToString().Split('|');
+      double valueItem = double.Parse(parameters[0]);
+      double multiplier = double.Parse(parameters[1]);
+
+      if (Utility.IsOSWindows())
+      {
+        return (int)valueItem;
+      }
+      else
+      {
+        return (int)(valueItem * multiplier);
+      }
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+    {
+      return null;
+    }
+  }
+
   public class RMultipleValueConverter : IValueConverter
   {
     public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
     {
       double doubleValue = (double)value;
       if (double.IsNaN(doubleValue) || double.IsInfinity(doubleValue)) return Constants.CONST_DASHES;
-      return Utility.FormatNumber(doubleValue,2)+"R";
+      return Utility.FormatNumber(doubleValue, 2) + "R";
     }
     public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
     {