mcs/class/System.Web/System.Web.UI.WebControls/ListItemCollection.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. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Peter Bartok    (pbartok@novell.com)
  24 //
  25 //
  26
  27 using System.Collections;
  28 using System.ComponentModel;
  29 using System.Globalization;
  30 using System.Reflection;
  31 using System.Security.Permissions;
  32
  33 namespace System.Web.UI.WebControls {
  34
  35         // CAS - no inheritance demand required because the class is sealed
  36         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  37         // attributes
  38         [Editor("System.Web.UI.Design.WebControls.ListItemsCollectionEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
  39         public sealed class ListItemCollection : IList, ICollection, IEnumerable, IStateManager
  40         {
  41 #region Fields
  42                 ArrayList items;
  43                 bool tracking;
  44                 bool dirty;
  45                 int lastDirty = 0;
  46 #endregion      // Fields
  47
  48 #region Public Constructors
  49                 public ListItemCollection() {
  50                         items = new ArrayList();
  51                 }
  52 #endregion      // Public Constructors
  53
  54 #region Public Instance Properties
  55                 public int Capacity {
  56                         get {
  57                                 return items.Capacity;
  58                         }
  59
  60                         set {
  61                                 items.Capacity = value;
  62                         }
  63                 }
  64
  65                 public int Count {
  66                         get {
  67                                 return items.Count;
  68                         }
  69                 }
  70
  71                 public bool IsReadOnly {
  72                         get {
  73                                 return items.IsReadOnly;
  74                         }
  75                 }
  76
  77                 public bool IsSynchronized {
  78                         get {
  79                                 return items.IsSynchronized;
  80                         }
  81                 }
  82
  83                 public object SyncRoot {
  84                         get {
  85                                 return items.SyncRoot;
  86                         }
  87                 }
  88
  89                 public ListItem this[int index] {
  90                         get {
  91                                 return (ListItem)items[index];
  92                         }
  93                 }
  94                 #endregion      // Public Instance Properties
  95
  96                 #region Public Instance Methods
  97                 public void Add(ListItem item) {
  98                         items.Add(item);
  99                         if (tracking) {
 100                                 item.TrackViewState ();
 101                                 SetDirty ();
 102                         }
 103                 }
 104
 105                 public void Add(string item) {
 106                         ListItem listItem = new ListItem (item);
 107                         items.Add (listItem);
 108
 109                         if (tracking) {
 110                                 listItem.TrackViewState ();
 111                                 SetDirty ();
 112                         }
 113                 }
 114
 115                 public void AddRange(ListItem[] items) {
 116                         for (int i = 0; i < items.Length; i++) {
 117                                 Add(items[i]);
 118
 119                                 if (tracking) {
 120                                         items [i].TrackViewState ();
 121                                         SetDirty ();
 122                                 }
 123                         }
 124                 }
 125
 126                 public void Clear() {
 127                         items.Clear();
 128
 129                         if (tracking)
 130                                 SetDirty ();
 131                 }
 132
 133                 public bool Contains(ListItem item) {
 134                         return items.Contains(item);
 135                 }
 136
 137                 public void CopyTo(Array array, int index) {
 138                         items.CopyTo(array, index);
 139                 }
 140
 141                 public ListItem FindByText (string text)
 142                 {
 143                         for (int i = 0; i < items.Count; i++)
 144                                 if (text == this [i].Text)
 145                                         return this [i];
 146
 147                         return null;
 148                 }
 149
 150                 public ListItem FindByValue (string value)
 151                 {
 152                         for (int i = 0; i < items.Count; i++)
 153                                 if (value == this [i].Value)
 154                                         return this [i];
 155
 156                         return null;
 157                 }
 158
 159                 public IEnumerator GetEnumerator() {
 160                         return items.GetEnumerator();
 161                 }
 162
 163                 public int IndexOf(ListItem item) {
 164                         return items.IndexOf(item);
 165                 }
 166
 167                 internal int IndexOf(string value) {
 168                         for (int i = 0; i < items.Count; i++)
 169                                 if (value == this [i].Value)
 170                                         return i;
 171                         return -1;
 172                 }
 173
 174                 public void Insert(int index, ListItem item) {
 175                         items.Insert(index, item);
 176
 177                         if (tracking) {
 178                                 item.TrackViewState ();
 179                                 lastDirty = index;
 180                                 SetDirty ();
 181                         }
 182                 }
 183
 184                 public void Insert(int index, string item) {
 185                         ListItem listItem = new ListItem(item);
 186                         items.Insert (index, listItem);
 187
 188                         if (tracking) {
 189                                 listItem.TrackViewState ();
 190                                 lastDirty = index;
 191                                 SetDirty ();
 192                         }
 193                 }
 194
 195                 public void Remove(ListItem item) {
 196                         items.Remove(item);
 197
 198                         if (tracking)
 199                                 SetDirty ();
 200                 }
 201
 202                 public void Remove (string item)
 203                 {
 204                         for (int i = 0; i < items.Count; i++)
 205                                 if (item == this [i].Value) {
 206                                         items.RemoveAt (i);
 207
 208                                         if (tracking)
 209                                                 SetDirty ();
 210                                 }
 211                 }
 212
 213                 public void RemoveAt(int index) {
 214                         items.RemoveAt(index);
 215
 216                         if (tracking)
 217                                 SetDirty ();
 218                 }
 219 #endregion      // Public Instance Methods
 220
 221 #region Interface methods
 222                 bool IList.IsFixedSize {
 223                         get {
 224                                 return items.IsFixedSize;
 225                         }
 226                 }
 227
 228                 object IList.this[int index] {
 229                         get {
 230                                 return this[index];
 231                         }
 232
 233                         set {
 234                                 if ((index >= 0) && (index < items.Count)) {
 235                                         items[index] = (ListItem)value;
 236
 237                                         if (tracking)
 238                                                 ((ListItem) value).TrackViewState ();
 239                                 }
 240                         }
 241                 }
 242
 243                 int IList.Add(object value) {
 244                         int i = items.Add ((ListItem) value);
 245
 246                         if (tracking) {
 247                                 ((IStateManager) value).TrackViewState ();
 248                                 SetDirty ();
 249                         }
 250                         return i;
 251                 }
 252
 253                 bool IList.Contains(object value) {
 254                         return Contains((ListItem)value);
 255                 }
 256
 257                 int IList.IndexOf(object value) {
 258                         return IndexOf((ListItem)value);
 259                 }
 260
 261                 void IList.Insert(int index, object value) {
 262                         Insert(index, (ListItem)value);
 263                 }
 264
 265                 void IList.Remove(object value) {
 266                         Remove((ListItem)value);
 267                 }
 268
 269                 bool IStateManager.IsTrackingViewState {
 270                         get {
 271                                 return tracking;
 272                         }
 273                 }
 274
 275                 void IStateManager.LoadViewState (object savedState)
 276                 {
 277                         Pair pair = savedState as Pair;
 278                         if (pair == null)
 279                                 return;
 280
 281                         bool newCollection = (bool) pair.First;
 282                         object [] itemsArray = (object []) pair.Second;
 283                         int count = itemsArray==null ? 0 : itemsArray.Length;
 284
 285                         if (newCollection)
 286                                 if (count > 0)
 287                                         items = new ArrayList(count);
 288                                 else
 289                                         items = new ArrayList();
 290
 291                         for (int i = 0; i < count; i++) {
 292                                 ListItem item = new ListItem ();
 293
 294                                 if (newCollection) {
 295                                         item.LoadViewState (itemsArray [i]);
 296                                         item.SetDirty ();
 297                                         Add (item);
 298                                 }
 299                                 else{
 300                                         if (itemsArray [i] != null){
 301                                                 item.LoadViewState (itemsArray [i]);
 302                                                 item.SetDirty ();
 303                                                 items [i] = item;
 304                                         }
 305                                 }
 306                         }
 307                 }
 308
 309                 object IStateManager.SaveViewState() {
 310                         int count;
 311                         bool itemsDirty = false;
 312
 313                         count = items.Count;
 314                         if (count == 0 && !dirty)
 315                                 return null;
 316
 317                         object [] itemsState = null;
 318                         if (count > 0)
 319                                 itemsState = new object [count];
 320
 321                         for (int i = 0; i < count; i++) {
 322                                 itemsState [i] = ((IStateManager) items [i]).SaveViewState ();
 323                                 if (itemsState [i] != null)
 324                                         itemsDirty = true;
 325                         }
 326
 327                         if (!dirty && !itemsDirty)
 328                                 return null;
 329
 330                         return new Pair (dirty, itemsState);
 331                 }
 332
 333                 void IStateManager.TrackViewState() {
 334                         tracking = true;
 335
 336                         for (int i = 0; i < items.Count; i++) {
 337                                 ((ListItem)items[i]).TrackViewState();
 338                         }
 339                 }
 340 #endregion      // Interface methods
 341
 342                 void SetDirty ()
 343                 {
 344                         dirty = true;
 345                         for (int i = lastDirty; i < items.Count; i++)
 346                                 ((ListItem) items [i]).SetDirty ();
 347
 348                         lastDirty = items.Count - 1;
 349                         if (lastDirty < 0)
 350                                 lastDirty = 0;
 351                 }
 352         }
 353 }