class/System.Drawing/System.Drawing.Printing/MarginsConverter.cs

   1 //
   2 // System.Drawing.MarginsConverter.cs
   3 //
   4 // Author:
   5 //   Dennis Hayes (dennish@Raytek.com)
   6 //   Herve Poussineau (hpoussineau@fr.st)
   7 //
   8 // (C) 2002 Ximian, Inc
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33 using System;
  34 using System.ComponentModel;
  35 using System.Globalization;
  36 using System.Text.RegularExpressions;
  37 using System.ComponentModel.Design.Serialization;
  38 using System.Reflection;
  39
  40 namespace System.Drawing.Printing {
  41         /// <summary>
  42         /// Summary description for MarginsConverter.
  43         /// </summary>
  44         public class MarginsConverter : ExpandableObjectConverter {
  45                 public MarginsConverter() {
  46                 }
  47                 #region Methods
  48                 public override bool CanConvertFrom(ITypeDescriptorContext context,Type sourceType) {
  49                         if (sourceType == typeof(string))
  50                                 return true;
  51
  52                         return base.CanConvertFrom(context, sourceType);
  53                 }
  54
  55                 public override bool CanConvertTo(ITypeDescriptorContext context,Type destinationType) {
  56                         if (destinationType == typeof(string))
  57                                 return true;
  58
  59                         if (destinationType == typeof (InstanceDescriptor))
  60                                 return true;
  61
  62                         return base.CanConvertTo(context, destinationType);
  63                 }
  64
  65                 public override object ConvertFrom(ITypeDescriptorContext context,CultureInfo culture,object value) {
  66                         if (value is string)
  67                         {
  68                                 if (value == null)
  69                                         return new Margins();
  70
  71                                 // format [left];[right];[top];[bottom]
  72                                 string separator = @"( |\t)*";
  73                                 separator = separator + ";" + separator;
  74                                 string regex = @"(?<left>\d+)" + separator + @"(?<right>\d+)" + separator + @"(?<top>\d+)" + separator + @"(?<bottom>\d+)";
  75
  76                                 Match match = new Regex(regex).Match(value as string);
  77                                 if (!match.Success)
  78                                         throw new ArgumentException("value");
  79
  80                                 int left, right, top, bottom;
  81                                 try
  82                                 {
  83                                         left = int.Parse(match.Groups["left"].Value);
  84                                         right = int.Parse(match.Groups["right"].Value);
  85                                         top = int.Parse(match.Groups["top"].Value);
  86                                         bottom = int.Parse(match.Groups["bottom"].Value);
  87                                 }
  88                                 catch (Exception e)
  89                                 {
  90                                         throw new ArgumentException("value", e);
  91                                 }
  92                                 return new Margins(left, right, top, bottom);
  93                         } else
  94                                 return base.ConvertFrom(context, culture, value);
  95                 }
  96
  97                 public override object ConvertTo(ITypeDescriptorContext context,CultureInfo culture,object value,Type destinationType) {
  98                         if (destinationType == typeof(string) && value is Margins)
  99                         {
 100                                 Margins source = value as Margins;
 101                                 string ret = "{0}; {1}; {2}; {3}";
 102                                 return String.Format(ret, source.Left, source.Right, source.Top, source.Bottom);
 103                         }
 104                         if (destinationType == typeof (InstanceDescriptor) && value is Margins) {
 105                                 Margins c = (Margins) value;
 106                                 ConstructorInfo ctor = typeof(Margins).GetConstructor (new Type[] {typeof(int), typeof(int), typeof(int), typeof(int)} );
 107                                 return new InstanceDescriptor (ctor, new object[] {c.Left, c.Right, c.Top, c.Bottom});
 108                         }
 109
 110                         return base.ConvertTo(context, culture, value, destinationType);
 111                 }
 112
 113                 public override bool GetCreateInstanceSupported(ITypeDescriptorContext context)
 114                 {
 115                         return true;
 116                 }
 117
 118                 public override object CreateInstance(ITypeDescriptorContext context, System.Collections.IDictionary propertyValues)
 119                 {
 120                         try
 121                         {
 122                                 Margins margins = new Margins();
 123                                 margins.Left = int.Parse(propertyValues["Left"].ToString());
 124                                 margins.Right = int.Parse(propertyValues["Right"].ToString());
 125                                 margins.Top = int.Parse(propertyValues["Top"].ToString());
 126                                 margins.Bottom = int.Parse(propertyValues["Bottom"].ToString());
 127                                 return margins;
 128                         }
 129                         catch (Exception)
 130                         {
 131                                 // in case of error, return null
 132                                 return null;
 133                         }
 134                 }
 135                 #endregion
 136         }
 137 }