mcs/class/Managed.Windows.Forms/System.Windows.Forms/DataObject.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
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   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. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Peter Bartok    (pbartok@novell.com)
  24 //
  25 //
  26
  27 // COMPLETE
  28
  29 using System;
  30 using System.Collections;
  31 using System.Runtime.InteropServices;
  32
  33 namespace System.Windows.Forms {
  34         [ClassInterface(ClassInterfaceType.None)]
  35         public class DataObject : IDataObject {
  36                 #region DataObject.Entry Class
  37                 private class Entry {
  38                         #region Local Variables
  39                         private string  type;
  40                         private object  data;
  41                         private bool    autoconvert;
  42                         internal Entry  next;
  43                         #endregion      // Local Variables
  44
  45                         #region Constructors
  46                         internal Entry(string type, object data, bool autoconvert) {
  47                                 Entry   e;
  48
  49                                 this.type = type;
  50                                 this.data = data;
  51                                 this.autoconvert = autoconvert;
  52                         }
  53                         #endregion      // Constructors
  54
  55                         #region Properties
  56                         public object Data {
  57                                 get {
  58                                         return data;
  59                                 }
  60                         }
  61                         #endregion      // Properties
  62
  63                         #region Methods
  64                         public static int Count(Entry entries) {
  65                                 int     result;
  66
  67                                 result = 0;
  68
  69                                 while (entries != null) {
  70                                         result++;
  71                                         entries = entries.next;
  72                                 }
  73
  74                                 return result;
  75                         }
  76
  77                         public static Entry Find(Entry entries, string type) {
  78                                 while (entries != null) {
  79                                         if (entries.type.Equals(type)) {
  80                                                 return entries;
  81                                         }
  82                                         entries = entries.next;
  83                                 }
  84
  85                                 return null;
  86                         }
  87
  88                         public static Entry FindConvertible(Entry entries, string type) {
  89                                 Entry e;
  90
  91                                 e = Find(entries, type);
  92                                 if (e != null) {
  93                                         return e;
  94                                 }
  95
  96                                 e = entries;
  97                                 while (e != null) {
  98                                         if (type == DataFormats.Text) {
  99                                                 if (e.type == DataFormats.UnicodeText) {
 100                                                         return e;
 101                                                 }
 102                                         } else if (type == DataFormats.UnicodeText) {
 103                                                 if (e.type == DataFormats.Text) {
 104                                                         return e;
 105                                                 }
 106                                         } else if (type == DataFormats.StringFormat) {
 107                                                 if (e.type == DataFormats.Text) {
 108                                                         return e;
 109                                                 } else if (e.type == DataFormats.UnicodeText) {
 110                                                         return e;
 111                                                 }
 112                                         }
 113                                         e = e.next;
 114                                 }
 115
 116                                 return null;
 117                         }
 118
 119                         public static string[] Entries(Entry entries, bool convertible) {
 120                                 Entry           e;
 121                                 ArrayList       list;
 122                                 string[]        result;
 123
 124                                 // Initially store into something that we can grow easily
 125                                 list = new ArrayList(Entry.Count(entries));
 126                                 e = entries;
 127
 128                                 while (e != null) {
 129                                         list.Add(e.type);
 130                                         e = e.next;
 131                                 }
 132
 133                                 if (convertible) {
 134                                         // Add the convertibles
 135                                         if ((Entry.Find(entries, DataFormats.Text) != null) && (Entry.Find(entries, DataFormats.UnicodeText) == null)) {
 136                                                 list.Add(DataFormats.UnicodeText);
 137                                         }
 138
 139                                         if ((Entry.Find(entries, DataFormats.Text) == null) && (Entry.Find(entries, DataFormats.UnicodeText) != null)) {
 140                                                 list.Add(DataFormats.Text);
 141                                         }
 142
 143                                         if (((Entry.Find(entries, DataFormats.Text) != null) || (Entry.Find(entries, DataFormats.UnicodeText) != null)) && (Entry.Find(entries, DataFormats.StringFormat) == null)) {
 144                                                 list.Add(DataFormats.StringFormat);
 145                                         }
 146                                 }
 147
 148                                 // Copy the results into a string array
 149                                 result = new string[list.Count];
 150                                 for (int i = 0; i < list.Count; i++) {
 151                                         result[i] = (string)list[i];
 152                                 }
 153
 154                                 return result;
 155                         }
 156                         #endregion      // Methods
 157                 }
 158                 #endregion      // DataObject.Entry class
 159
 160                 #region Local Variables
 161                 private Entry   entries;
 162                 #endregion      // Local Variables
 163
 164                 #region Public Constructors
 165                 public DataObject() {
 166                         entries = null;
 167                 }
 168
 169                 public DataObject(object data) {
 170                         SetData(data);
 171                 }
 172
 173                 public DataObject(string format, object data) {
 174                         SetData(format, data);
 175                 }
 176                 #endregion      // Public Constructors
 177
 178                 #region Public Instance Properties
 179                 public virtual object GetData(string format) {
 180                         return GetData(format, true);
 181                 }
 182
 183                 public virtual object GetData(string format, bool autoConvert) {
 184                         if (autoConvert) {
 185                                 return Entry.FindConvertible(entries, format).Data;
 186                         } else {
 187                                 return Entry.Find(entries, format).Data;
 188                         }
 189                 }
 190
 191                 public virtual object GetData(Type format) {
 192                         return GetData(format.FullName, true);
 193                 }
 194
 195                 public virtual bool GetDataPresent(string format) {
 196                         return GetDataPresent(format, true);
 197                 }
 198
 199                 public virtual bool GetDataPresent(string format, bool autoConvert) {
 200                         if (autoConvert) {
 201                                 return Entry.FindConvertible(entries, format) != null;
 202                         } else {
 203                                 return Entry.Find(entries, format) != null;
 204                         }
 205                 }
 206
 207                 public virtual bool GetDataPresent(Type format) {
 208                         return GetDataPresent(format.FullName, true);
 209                 }
 210
 211                 public virtual string[] GetFormats() {
 212                         return GetFormats(true);
 213                 }
 214
 215                 public virtual string[] GetFormats(bool autoConvert) {
 216                         return Entry.Entries(entries, autoConvert);
 217                 }
 218
 219                 public virtual void SetData(object data) {
 220                         SetData(data.GetType(), data);
 221                 }
 222
 223                 public virtual void SetData(string format, bool autoConvert, object data) {
 224                         Entry   entry;
 225                         Entry   e;
 226
 227                         entry = new DataObject.Entry(format, data, autoConvert);
 228
 229                         lock (this) {
 230                                 if (entries == null) {
 231                                         entries = entry;
 232                                 } else {
 233                                         // Insert into the list of known/defined formats
 234                                         e = entries;
 235
 236                                         while (e.next != null) {
 237                                                 e = e.next;
 238                                         }
 239                                         e.next = entry;
 240                                 }
 241                         }
 242                 }
 243
 244                 public virtual void SetData(string format, object data) {
 245                         SetData(format, true, data);
 246                 }
 247
 248                 public virtual void SetData(Type format, object data) {
 249                         SetData(EnsureFormat(format), true, data);
 250                 }
 251                 #endregion      // Public Instance Properties
 252
 253                 #region Public Instance Methods
 254                 #endregion      // Public Instance Methods
 255
 256                 #region Private Methods
 257                 internal string EnsureFormat(string name) {
 258                         DataFormats.Format f;
 259
 260                         f = DataFormats.Format.Find(name);
 261                         if (f == null) {
 262                                 // Register the format
 263                                 f = DataFormats.Format.Add(name);
 264                         }
 265
 266                         return f.Name;
 267                 }
 268
 269                 internal string EnsureFormat(Type type) {
 270                         return EnsureFormat(type.FullName);
 271                 }
 272
 273                 #endregion      // Private Methods
 274         }
 275 }