mcs/class/System.Web/System.Web.UI.WebControls/FontUnitConverter.cs

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     FontUnitConverter\r
   4  *\r
   5  * Author:  Gaurav Vaish, Gonzalo Paniagua Javier\r
   6  * Maintainer: gvaish@iitk.ac.in\r
   7  * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>, <gonzalo@ximian.com>\r
   8  * Implementation: yes\r
   9  * Status: 95%\r
  10  *\r
  11  * (C) Gaurav Vaish (2002)\r
  12  * (c) 2002 Ximian, Inc. (http://www.ximian.com)\r
  13  */\r
  14 \r
  15 using System;\r
  16 using System.Globalization;\r
  17 using System.ComponentModel;\r
  18 using System.Web;\r
  19 using System.Web.UI;\r
  20 \r
  21 namespace System.Web.UI.WebControls\r
  22 {\r
  23         public class FontUnitConverter : TypeConverter\r
  24         {\r
  25                 static StandardValuesCollection valuesCollection;\r
  26                 static string creatingValues = "creating value collection";\r
  27 \r
  28                 public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)\r
  29                 {\r
  30                         if(sourceType == typeof(string))\r
  31                                 return true;\r
  32                         return base.CanConvertFrom(context, sourceType);\r
  33                 }\r
  34 \r
  35                 public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)\r
  36                 {\r
  37                         if(value == null)\r
  38                                 return null;\r
  39                         if(value is string)\r
  40                         {\r
  41                                 string val = ((string)value).Trim();\r
  42                                 if(val.Length == 0)\r
  43                                 {\r
  44                                         return FontUnit.Empty;\r
  45                                 }\r
  46                                 return FontUnit.Parse(val, culture);\r
  47                         }\r
  48                         return base.ConvertFrom(context, culture, value);\r
  49                 }\r
  50 \r
  51                 public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)\r
  52                 {\r
  53                         if(value != null && value is FontUnit)\r
  54                         {\r
  55                                 FontUnit val = (FontUnit)value;\r
  56                                 if(val.Type == FontSize.NotSet)\r
  57                                 {\r
  58                                         return String.Empty;\r
  59                                 }\r
  60                                 return val.ToString(culture);\r
  61                         }\r
  62                         return base.ConvertTo(context, culture, value, destinationType);\r
  63                 }\r
  64 \r
  65                 public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)\r
  66                 {\r
  67                         if (valuesCollection != null)\r
  68                                 return valuesCollection;\r
  69 \r
  70                         lock (creatingValues) {\r
  71                                 if (valuesCollection != null)\r
  72                                         return valuesCollection;\r
  73 \r
  74                                 Array values = Enum.GetValues (typeof (FontUnit));\r
  75                                 Array.Sort (values);\r
  76                                 valuesCollection = new StandardValuesCollection (values);\r
  77                         }\r
  78 \r
  79                         return valuesCollection;\r
  80                 }\r
  81 \r
  82                 public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)\r
  83                 {\r
  84                         return false;\r
  85                 }\r
  86 \r
  87                 public override bool GetStandardValuesSupported(ITypeDescriptorContext context)\r
  88                 {\r
  89                         return true;\r
  90                 }\r
  91         }\r
  92 }\r