mcs/class/System.Windows.Forms/System.Windows.Forms/CursorConverter.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24
  25
  26 using System;
  27 using System.IO;
  28 using System.Drawing;
  29 using System.Drawing.Imaging;
  30 using System.Collections;
  31 using System.ComponentModel;
  32 using System.ComponentModel.Design.Serialization;
  33 using System.Globalization;
  34 using System.Reflection;
  35 using System.Runtime.InteropServices;
  36 using System.Runtime.Serialization;
  37
  38 namespace System.Windows.Forms
  39 {
  40         public class CursorConverter : TypeConverter
  41         {
  42                 public CursorConverter ()
  43                 {
  44                 }
  45
  46                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  47                 {
  48                         if (sourceType == typeof (byte []))
  49                                 return true;
  50                         return base.CanConvertFrom (context, sourceType);
  51                 }
  52
  53                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  54                 {
  55                         if (destinationType == typeof (byte []) || destinationType == typeof (InstanceDescriptor))
  56                                 return true;
  57                         return base.CanConvertTo (context, destinationType);
  58                 }
  59
  60                 public override object ConvertFrom (ITypeDescriptorContext context,
  61                                 CultureInfo culture, object value)
  62                 {
  63                         byte [] val = value as byte [];
  64                         if (val == null)
  65                                 return base.ConvertFrom (context, culture, value);
  66
  67                         using (MemoryStream s = new MemoryStream (val)) {
  68                                 return new Cursor (s);
  69                         }
  70                 }
  71
  72                 public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture,
  73                                 object value, Type destinationType)
  74                 {
  75                         if (destinationType == null)
  76                                 throw new ArgumentNullException ("destinationType");
  77
  78                         if (value == null && destinationType == typeof (string))
  79                                 return "(none)";
  80
  81                         if ( !(value is Cursor))
  82                                 throw new ArgumentException("object must be of class Cursor", "value");
  83
  84                         if (destinationType == typeof (byte [])) {
  85                                 Cursor                  c;
  86                                 SerializationInfo       si;
  87
  88                                 if (value == null) {
  89                                         return new byte [0];
  90                                 }
  91
  92                                 c = (Cursor)value;
  93
  94                                 si = new SerializationInfo(typeof(Cursor), new FormatterConverter());
  95                                 ((ISerializable)c).GetObjectData(si, new StreamingContext(StreamingContextStates.Remoting));
  96
  97                                 return (byte[])si.GetValue("CursorData", typeof(byte[]));
  98                         } else if (destinationType == typeof (InstanceDescriptor)) {
  99                                 PropertyInfo[] properties = typeof (Cursors).GetProperties ();
 100                                 foreach (PropertyInfo propInfo in properties) {
 101                                         if (propInfo.GetValue (null, null) == value) {
 102                                                 return new InstanceDescriptor (propInfo, null);
 103                                         }
 104                                 }
 105                         }
 106                         return base.ConvertTo (context, culture, value, destinationType);
 107                 }
 108
 109                 public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
 110                 {
 111                         PropertyInfo[] props = typeof (Cursors).GetProperties();
 112
 113                         ArrayList vals = new ArrayList ();
 114
 115                         for (int i = 0; i < props.Length; i++) {
 116                                 vals.Add (props [i].GetValue (null, null));
 117                         }
 118                         return new StandardValuesCollection (vals);
 119                 }
 120
 121                 public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
 122                 {
 123                         return true;
 124                 }
 125         }
 126 }