mcs/class/System.Drawing/System.Drawing/PointConverter.cs

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