mcs/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 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.ComponentModel;
  38 using System.Collections;
  39 using System.Globalization;
  40 using System.Text;
  41 using System.ComponentModel.Design.Serialization;
  42 using System.Reflection;
  43
  44 namespace System.Drawing
  45 {
  46         /// <summary>
  47         /// Summary description for RectangleConverter.
  48         /// </summary>
  49         public class RectangleConverter : TypeConverter
  50         {
  51                 public RectangleConverter ()
  52                 {
  53                 }
  54
  55                 public override bool CanConvertFrom (ITypeDescriptorContext context,
  56                                                      Type sourceType)
  57                 {
  58                         if (sourceType == typeof (string))
  59                                 return true;
  60
  61                         return base.CanConvertFrom (context, sourceType);
  62                 }
  63
  64                 public override bool CanConvertTo (ITypeDescriptorContext context,
  65                                                    Type destinationType)
  66                 {
  67                         if (destinationType == typeof (string))
  68                                 return true;
  69
  70                         if (destinationType == typeof (InstanceDescriptor))
  71                                 return true;
  72
  73                         return base.CanConvertTo (context, destinationType);
  74                 }
  75
  76                 public override object ConvertFrom (ITypeDescriptorContext context,
  77                                                     CultureInfo culture,
  78                                                     object value)
  79                 {
  80                         string s = value as string;
  81                         if (s == null)
  82                                 return base.ConvertFrom (context, culture, value);
  83
  84                         string [] subs = s.Split (culture.TextInfo.ListSeparator.ToCharArray ());
  85
  86                         Int32Converter converter = new Int32Converter ();
  87                         int[] numSubs = new int[subs.Length];
  88                         for (int i = 0; i < numSubs.Length; i++) {
  89                                 numSubs[i] = (int) converter.ConvertFromString (context, culture, subs[i]);
  90                         }
  91
  92                         if (subs.Length != 4)
  93                                 throw new ArgumentException ("Failed to parse Text(" + s + ") expected text in the format \"x,y,Width,Height.\"");
  94
  95                         return new Rectangle (numSubs[0], numSubs[1], numSubs[2], numSubs[3]);
  96                 }
  97
  98                 public override object ConvertTo (ITypeDescriptorContext context,
  99                                                   CultureInfo culture,
 100                                                   object value,
 101                                                   Type destinationType)
 102                 {
 103                         // LAMESPEC: "The default implementation calls the object's
 104                         // ToString method if the object is valid and if the destination
 105                         // type is string." MS does not behave as per the specs.
 106                         // Oh well, we have to be compatible with MS.
 107                         if ((destinationType == typeof (string)) && (value is Rectangle)) {
 108                                 string separator = culture.TextInfo.ListSeparator;
 109                                 Rectangle rect = (Rectangle) value;
 110                                 StringBuilder sb = new StringBuilder ();
 111                                 sb.Append (rect.X.ToString (culture));
 112                                 sb.Append (separator);
 113                                 sb.Append (" ");
 114                                 sb.Append (rect.Y.ToString (culture));
 115                                 sb.Append (separator);
 116                                 sb.Append (" ");
 117                                 sb.Append (rect.Width.ToString (culture));
 118                                 sb.Append (separator);
 119                                 sb.Append (" ");
 120                                 sb.Append (rect.Height.ToString (culture));
 121                                 return sb.ToString ();
 122                         }
 123
 124                         if (destinationType == typeof (InstanceDescriptor) && value is Rectangle) {
 125                                 Rectangle c = (Rectangle) value;
 126                                 ConstructorInfo ctor = typeof(Rectangle).GetConstructor (new Type[] {typeof(int), typeof(int), typeof(int), typeof(int)} );
 127                                 return new InstanceDescriptor (ctor, new object[] {c.X, c.Y, c.Width, c.Height});
 128                         }
 129
 130                         return base.ConvertTo (context, culture, value, destinationType);
 131                 }
 132
 133                 public override object CreateInstance (ITypeDescriptorContext context,
 134                                                        IDictionary propertyValues)
 135                 {
 136                         int x = (int) propertyValues ["X"];
 137                         int y = (int) propertyValues ["Y"];
 138                         int width = (int) propertyValues ["Width"];
 139                         int height = (int) propertyValues ["Height"];
 140
 141                         return new Rectangle (x, y, width, height);
 142                 }
 143
 144                 public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
 145                 {
 146                         return true;
 147                 }
 148
 149                 public override PropertyDescriptorCollection GetProperties (
 150                                                         ITypeDescriptorContext context,
 151                                                         object value, Attribute[] attributes)
 152                 {
 153                         if (value is Rectangle)
 154                                 return TypeDescriptor.GetProperties (value, attributes);
 155
 156                         return base.GetProperties (context, value, attributes);
 157                 }
 158
 159                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 160                 {
 161                         return true;
 162                 }
 163         }
 164 }