class/System.Drawing/System.Drawing/RectangleConverter.cs

   1 //
   2 // System.Drawing.RectangleConverter.cs
   3 //
   4 // Authors:
   5 //      Dennis Hayes (dennish@Raytek.com)
   6 //      Jordi Mas (jordi@ximian.com)
   7 //      Ravindra (rkumar@novell.com)
   8 //
   9 // Copyright (C) 2002 Ximian, Inc. http://www.ximian.com
  10 // Copyright (C) 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.ComponentModel;
  33 using System.Collections;
  34 using System.Globalization;
  35 using System.Text;
  36 using System.ComponentModel.Design.Serialization;
  37 using System.Reflection;
  38
  39 namespace System.Drawing {
  40
  41         public class RectangleConverter : TypeConverter
  42         {
  43                 public RectangleConverter ()
  44                 {
  45                 }
  46
  47                 public override bool CanConvertFrom (ITypeDescriptorContext context,
  48                                                      Type sourceType)
  49                 {
  50                         if (sourceType == typeof (string))
  51                                 return true;
  52
  53                         return base.CanConvertFrom (context, sourceType);
  54                 }
  55
  56                 public override bool CanConvertTo (ITypeDescriptorContext context,
  57                                                    Type destinationType)
  58                 {
  59                         if (destinationType == typeof (string))
  60                                 return true;
  61
  62                         if (destinationType == typeof (InstanceDescriptor))
  63                                 return true;
  64
  65                         return base.CanConvertTo (context, destinationType);
  66                 }
  67
  68                 public override object ConvertFrom (ITypeDescriptorContext context,
  69                                                     CultureInfo culture,
  70                                                     object value)
  71                 {
  72                         string s = value as string;
  73                         if (s == null)
  74                                 return base.ConvertFrom (context, culture, value);
  75
  76                         string [] subs = s.Split (culture.TextInfo.ListSeparator.ToCharArray ());
  77
  78                         Int32Converter converter = new Int32Converter ();
  79                         int[] numSubs = new int[subs.Length];
  80                         for (int i = 0; i < numSubs.Length; i++) {
  81                                 numSubs[i] = (int) converter.ConvertFromString (context, culture, subs[i]);
  82                         }
  83
  84                         if (subs.Length != 4)
  85                                 throw new ArgumentException ("Failed to parse Text(" + s + ") expected text in the format \"x,y,Width,Height.\"");
  86
  87                         return new Rectangle (numSubs[0], numSubs[1], numSubs[2], numSubs[3]);
  88                 }
  89
  90                 public override object ConvertTo (ITypeDescriptorContext context,
  91                                                   CultureInfo culture,
  92                                                   object value,
  93                                                   Type destinationType)
  94                 {
  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 Rectangle) {
 100                                 Rectangle rect = (Rectangle) value;
 101                                 if (destinationType == typeof (string)) {
 102                                         string separator = culture.TextInfo.ListSeparator;
 103                                         StringBuilder sb = new StringBuilder ();
 104                                         sb.Append (rect.X.ToString (culture));
 105                                         sb.Append (separator);
 106                                         sb.Append (" ");
 107                                         sb.Append (rect.Y.ToString (culture));
 108                                         sb.Append (separator);
 109                                         sb.Append (" ");
 110                                         sb.Append (rect.Width.ToString (culture));
 111                                         sb.Append (separator);
 112                                         sb.Append (" ");
 113                                         sb.Append (rect.Height.ToString (culture));
 114                                         return sb.ToString ();
 115                                 } else if (destinationType == typeof (InstanceDescriptor)) {
 116                                         ConstructorInfo ctor = typeof(Rectangle).GetConstructor (new Type[] {typeof(int), typeof(int), typeof(int), typeof(int)} );
 117                                         return new InstanceDescriptor (ctor, new object[] {rect.X, rect.Y, rect.Width, rect.Height});
 118                                 }
 119                         }
 120
 121                         return base.ConvertTo (context, culture, value, destinationType);
 122                 }
 123
 124                 public override object CreateInstance (ITypeDescriptorContext context,
 125                                                        IDictionary propertyValues)
 126                 {
 127 #if NET_2_0
 128                         object ox = propertyValues ["X"];
 129                         object oy = propertyValues ["Y"];
 130                         object ow = propertyValues ["Width"];
 131                         object oh = propertyValues ["Height"];
 132                         if ((ox == null) || (oy == null) || (ow == null) || (oh == null))
 133                                 throw new ArgumentException ("propertyValues");
 134
 135                         int x = (int) ox;
 136                         int y = (int) oy;
 137                         int width = (int) ow;
 138                         int height = (int) oh;
 139 #else
 140                         int x = (int) propertyValues ["X"];
 141                         int y = (int) propertyValues ["Y"];
 142                         int width = (int) propertyValues ["Width"];
 143                         int height = (int) propertyValues ["Height"];
 144 #endif
 145                         return new Rectangle (x, y, width, height);
 146                 }
 147
 148                 public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
 149                 {
 150                         return true;
 151                 }
 152
 153                 public override PropertyDescriptorCollection GetProperties (
 154                                                         ITypeDescriptorContext context,
 155                                                         object value, Attribute[] attributes)
 156                 {
 157                         if (value is Rectangle)
 158                                 return TypeDescriptor.GetProperties (value, attributes);
 159
 160                         return base.GetProperties (context, value, attributes);
 161                 }
 162
 163                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 164                 {
 165                         return true;
 166                 }
 167         }
 168 }