mcs/class/System.Drawing/System.Drawing/SizeConverter.cs

   1 //
   2 // System.Drawing.SizeConverter.cs
   3 //
   4 // Authors:
   5 //      Dennis Hayes (dennish@Raytek.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //      Ravindra (rkumar@novell.com)
   8 //
   9 // Copyright (C) 2002 Ximian, Inc. http://www.ximian.com
  10 // Copyright (C) 2003 Novell, Inc. http://www.novell.com
  11 //
  12
  13 //
  14 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System;
  37 using System.Collections;
  38 using System.ComponentModel;
  39 using System.Globalization;
  40
  41 namespace System.Drawing
  42 {
  43         /// <summary>
  44         /// Summary description for SizeConverter.
  45         /// </summary>
  46         public class SizeConverter : TypeConverter
  47         {
  48                 public SizeConverter()
  49                 {
  50                 }
  51
  52                 public override bool CanConvertFrom (ITypeDescriptorContext context,
  53                                                      Type sourceType)
  54                 {
  55                         if (sourceType == typeof (string))
  56                                 return true;
  57
  58                         return base.CanConvertFrom (context, sourceType);
  59                 }
  60
  61                 public override bool CanConvertTo (ITypeDescriptorContext context,
  62                                                    Type destinationType)
  63                 {
  64                         if (destinationType == typeof (string))
  65                                 return true;
  66
  67                         return base.CanConvertTo (context, destinationType);
  68                 }
  69
  70                 public override object ConvertFrom (ITypeDescriptorContext context,
  71                                                     CultureInfo culture,
  72                                                     object value)
  73                 {
  74                         string s = value as string;
  75                         if (s == null)
  76                                 return base.ConvertFrom (context, culture, value);
  77
  78                         // FIXME: use culture
  79                         string [] subs = s.Split (',');
  80                         if (subs.Length != 2)
  81                                 throw new ArgumentException ("Failed to parse Text(" + s + ") expected text in the format \"Width,Height.\"");
  82
  83                         int width = Int32.Parse (subs [0]);
  84                         int height = Int32.Parse (subs [1]);
  85
  86                         return new Size (width, height);
  87                 }
  88
  89                 public override object ConvertTo (ITypeDescriptorContext context,
  90                                                   CultureInfo culture,
  91                                                   object value,
  92                                                   Type destinationType)
  93                 {
  94                         // LAMESPEC: "The default implementation calls the ToString method
  95                         // of the object if the object is valid and if the destination
  96                         // type is string." MS does not behave as per the specs.
  97                         // Oh well, we have to be compatible with MS.
  98                         if ((destinationType == typeof (string)) && (value is Size))
  99                                 return ((Size) value).Width + ", " + ((Size) value).Height;
 100
 101                         return base.ConvertTo (context, culture, value, destinationType);
 102                 }
 103
 104                 public override object CreateInstance (ITypeDescriptorContext context,
 105                                                        IDictionary propertyValues)
 106                 {
 107                         int width = (int) propertyValues ["Width"];
 108                         int height = (int) propertyValues ["Height"];
 109
 110                         return new Size (width, height);
 111                 }
 112
 113                 public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
 114                 {
 115                         return true;
 116                 }
 117
 118                 public override PropertyDescriptorCollection GetProperties (
 119                                                         ITypeDescriptorContext context,
 120                                                         object value, Attribute[] attributes)
 121                 {
 122                         if (value is Size)
 123                                 return TypeDescriptor.GetProperties (value, attributes);
 124
 125                         return base.GetProperties (context, value, attributes);
 126                 }
 127
 128                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 129                 {
 130                         return true;
 131                 }
 132         }
 133 }