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 // Copyright (C) 2004, 2006, 2008 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.ComponentModel;
  33 using System.Globalization;
  34 using System.ComponentModel.Design.Serialization;
  35 using System.Reflection;
  36
  37 namespace System.Drawing {
  38
  39         public class PointConverter : TypeConverter
  40         {
  41                 public PointConverter() { }
  42
  43                 public override bool CanConvertFrom (ITypeDescriptorContext context,
  44                                                      Type sourceType)
  45                 {
  46                         if (sourceType == typeof (string))
  47                                 return true;
  48
  49                         return base.CanConvertFrom (context, sourceType);
  50                 }
  51
  52                 public override bool CanConvertTo (ITypeDescriptorContext context,
  53                                                    Type destinationType)
  54                 {
  55                         if (destinationType == typeof (string))
  56                                 return true;
  57
  58                         if (destinationType == typeof (InstanceDescriptor))
  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                         if (culture == null)
  69                                 culture = CultureInfo.CurrentCulture;
  70                         string s = value as string;
  71                         if (s == null)
  72                                 return base.ConvertFrom (context, culture, value);
  73
  74                         string [] subs = s.Split (culture.TextInfo.ListSeparator.ToCharArray ());
  75
  76                         Int32Converter converter = new Int32Converter ();
  77                         int[] numSubs = new int[subs.Length];
  78                         for (int i = 0; i < numSubs.Length; i++) {
  79                                 numSubs[i] = (int) converter.ConvertFromString (context, culture, subs[i]);
  80                         }
  81
  82                         if (subs.Length != 2)
  83                                 throw new ArgumentException ("Failed to parse Text(" + s + ") expected text in the format \"x, y.\"");
  84
  85                         return new Point (numSubs[0], numSubs[1]);
  86                 }
  87
  88                 public override object ConvertTo (ITypeDescriptorContext context,
  89                                                   CultureInfo culture,
  90                                                   object value,
  91                                                   Type destinationType)
  92                 {
  93                         if (culture == null)
  94                                 culture = CultureInfo.CurrentCulture;
  95                         // LAMESPEC: "The default implementation calls the object's
  96                         // ToString method if the object is valid and if the destination
  97                         // type is string." MS does not behave as per the specs.
  98                         // Oh well, we have to be compatible with MS.
  99                         if (value is Point) {
 100                                 Point point = (Point) value;
 101                                 if (destinationType == typeof (string)) {
 102                                         return point.X.ToString (culture) + culture.TextInfo.ListSeparator
 103                                                 + " " + point.Y.ToString (culture);
 104                                 } else if (destinationType == typeof (InstanceDescriptor)) {
 105                                         ConstructorInfo ctor = typeof(Point).GetConstructor (new Type[] {typeof(int), typeof(int)} );
 106                                         return new InstanceDescriptor (ctor, new object[] {point.X, point.Y });
 107                                 }
 108                         }
 109
 110                         return base.ConvertTo (context, culture, value, destinationType);
 111                 }
 112
 113                 public override object CreateInstance (ITypeDescriptorContext context,
 114                                                        IDictionary propertyValues)
 115                 {
 116 #if NET_2_0
 117                         object ox = propertyValues ["X"];
 118                         object oy = propertyValues ["Y"];
 119                         if ((ox == null) || (oy == null))
 120                                 throw new ArgumentException ("propertyValues");
 121
 122                         int x = (int) ox;
 123                         int y = (int) oy;
 124 #else
 125                         int x = (int) propertyValues ["X"];
 126                         int y = (int) propertyValues ["Y"];
 127 #endif
 128                         return new Point (x, y);
 129                 }
 130
 131
 132                 public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
 133                 {
 134                         return true;
 135                 }
 136
 137                 public override PropertyDescriptorCollection GetProperties (
 138                                                         ITypeDescriptorContext context,
 139                                                         object value, Attribute[] attributes)
 140                 {
 141                         if (value is Point)
 142                                 return TypeDescriptor.GetProperties (value, attributes);
 143
 144                         return base.GetProperties (context, value, attributes);
 145                 }
 146
 147                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 148                 {
 149                         return true;
 150                 }
 151
 152         }
 153 }