class/System.Drawing/System.Drawing/IconConverter.cs

   1                                                                                                              //
   2 // System.Drawing.IconConverter.cs
   3 //
   4 // Authors:
   5 //   Dennis Hayes (dennish@Raytek.com)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //   Sanjay Gupta (gsanjay@novell.com)
   8 //
   9 // (C) 2002 Ximian, Inc
  10 //
  11
  12 //
  13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System;
  36 using System.ComponentModel;
  37 using System.Globalization;
  38 using System.IO;
  39
  40 namespace System.Drawing {
  41         /// <summary>
  42         /// Summary description for IconConverter.
  43         /// </summary>
  44         public class IconConverter : ExpandableObjectConverter
  45         {
  46                 public IconConverter()
  47                 {
  48                 }
  49
  50                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  51                 {
  52                         if (sourceType == typeof (System.Byte []))
  53                                 return true;
  54                         else
  55                                 return false;
  56                 }
  57
  58                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  59                 {
  60                         if ((destinationType == typeof (System.Byte [])) || (destinationType == typeof (System.String)))
  61                                 return true;
  62                         else
  63                                 return false;
  64                 }
  65
  66                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  67                 {
  68                         byte [] bytes = value as byte [];
  69                         if (bytes == null)
  70                                 return base.ConvertFrom (context, culture, value);
  71
  72                         MemoryStream ms = new MemoryStream (bytes);
  73
  74                         return new Icon (ms);
  75                 }
  76
  77                 public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
  78                 {
  79                         if ((value is Icon) && (destinationType == typeof (string)))
  80                                 return value.ToString ();
  81                         else if (value == null && destinationType == typeof (string))
  82                                 return "(none)";
  83                         else if (CanConvertTo (null, destinationType)) {
  84                                 //came here means destType is byte array ;
  85                                 MemoryStream ms = new MemoryStream ();
  86                                 ((Icon) value).Save (ms);
  87                                 return ms.GetBuffer ();
  88                         }else
  89                                 return new NotSupportedException ("IconConverter can not convert from " + value.GetType ());
  90                 }
  91         }
  92 }