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) 2003,2004,2006,2008 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.Collections;
  33 using System.ComponentModel;
  34 using System.Globalization;
  35 using System.ComponentModel.Design.Serialization;
  36 using System.Reflection;
  37
  38 namespace System.Drawing {
  39
  40         public class SizeConverter : TypeConverter
  41         {
  42                 public SizeConverter()
  43                 {
  44                 }
  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                         if (destinationType == typeof (InstanceDescriptor))
  62                                 return true;
  63
  64                         return base.CanConvertTo (context, destinationType);
  65                 }
  66
  67                 public override object ConvertFrom (ITypeDescriptorContext context,
  68                                                     CultureInfo culture,
  69                                                     object value)
  70                 {
  71                         if (culture == null)
  72                                 culture = CultureInfo.CurrentCulture;
  73                         string s = value as string;
  74                         if (s == null)
  75                                 return base.ConvertFrom (context, culture, value);
  76
  77                         string[] subs = s.Split (culture.TextInfo.ListSeparator.ToCharArray ());
  78
  79                         Int32Converter converter = new Int32Converter ();
  80                         int[] numSubs = new int[subs.Length];
  81                         for (int i = 0; i < numSubs.Length; i++) {
  82                                 numSubs[i] = (int) converter.ConvertFromString (context, culture, subs[i]);
  83                         }
  84
  85                         if (subs.Length != 2)
  86                                 throw new ArgumentException ("Failed to parse Text(" + s + ") expected text in the format \"Width,Height.\"");
  87
  88                         return new Size (numSubs[0], numSubs[1]);
  89                 }
  90
  91                 public override object ConvertTo (ITypeDescriptorContext context,
  92                                                   CultureInfo culture,
  93                                                   object value,
  94                                                   Type destinationType)
  95                 {
  96                         if (culture == null)
  97                                 culture = CultureInfo.CurrentCulture;
  98                         // LAMESPEC: "The default implementation calls the ToString method
  99                         // of the object if the object is valid and if the destination
 100                         // type is string." MS does not behave as per the specs.
 101                         // Oh well, we have to be compatible with MS.
 102                         if (value is Size) {
 103                                 Size size = (Size) value;
 104                                 if (destinationType == typeof (string)) {
 105                                         return size.Width.ToString (culture) + culture.TextInfo.ListSeparator
 106                                                 + " " + size.Height.ToString (culture);
 107                                 } else if (destinationType == typeof (InstanceDescriptor)) {
 108                                         ConstructorInfo ctor = typeof(Size).GetConstructor (new Type[] {typeof(int), typeof(int)});
 109                                         return new InstanceDescriptor (ctor, new object[] { size.Width, size.Height });
 110                                 }
 111                         }
 112
 113                         return base.ConvertTo (context, culture, value, destinationType);
 114                 }
 115
 116                 public override object CreateInstance (ITypeDescriptorContext context,
 117                                                        IDictionary propertyValues)
 118                 {
 119 #if NET_2_0
 120                         object ow = propertyValues ["Width"];
 121                         object oh = propertyValues ["Height"];
 122                         if ((ow == null) || (oh == null))
 123                                 throw new ArgumentException ("propertyValues");
 124
 125                         int width = (int) ow;
 126                         int height = (int) oh;
 127 #else
 128                         int width = (int) propertyValues ["Width"];
 129                         int height = (int) propertyValues ["Height"];
 130 #endif
 131                         return new Size (width, height);
 132                 }
 133
 134                 public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
 135                 {
 136                         return true;
 137                 }
 138
 139                 public override PropertyDescriptorCollection GetProperties (
 140                                                         ITypeDescriptorContext context,
 141                                                         object value, Attribute[] attributes)
 142                 {
 143                         if (value is Size)
 144                                 return TypeDescriptor.GetProperties (value, attributes);
 145
 146                         return base.GetProperties (context, value, attributes);
 147                 }
 148
 149                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 150                 {
 151                         return true;
 152                 }
 153         }
 154 }