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                 bool itemsEnabled;
  46                 int lastDirty = 0;
  47 #endregion      // Fields
  48
  49 #region Public Constructors
  50                 public ListItemCollection() {
  51                         items = new ArrayList();
  52                 }
  53 #endregion      // Public Constructors
  54
  55                 internal bool ItemsEnabled {
  56                         get { return itemsEnabled; }
  57                         set { itemsEnabled = value; }
  58                 }
  59
  60 #region Public Instance Properties
  61                 public int Capacity {
  62                         get {
  63                                 return items.Capacity;
  64                         }
  65
  66                         set {
  67                                 items.Capacity = value;
  68                         }
  69                 }
  70
  71                 public int Count {
  72                         get {
  73                                 return items.Count;
  74                         }
  75                 }
  76
  77                 public bool IsReadOnly {
  78                         get {
  79                                 return items.IsReadOnly;
  80                         }
  81                 }
  82
  83                 public bool IsSynchronized {
  84                         get {
  85                                 return items.IsSynchronized;
  86                         }
  87                 }
  88
  89                 public object SyncRoot {
  90                         get {
  91                                 return items.SyncRoot;
  92                         }
  93                 }
  94
  95                 public ListItem this[int index] {
  96                         get {
  97                                 return (ListItem)items[index];
  98                         }
  99                 }
 100                 #endregion      // Public Instance Properties
 101
 102                 #region Public Instance Methods
 103                 public void Add(ListItem item) {
 104                         items.Add(item);
 105                         if (tracking) {
 106                                 item.TrackViewState ();
 107                                 SetDirty ();
 108                         }
 109                 }
 110
 111                 public void Add(string item) {
 112                         ListItem listItem = new ListItem (item);
 113                         items.Add (listItem);
 114
 115                         if (tracking) {
 116                                 listItem.TrackViewState ();
 117                                 SetDirty ();
 118                         }
 119                 }
 120
 121                 public void AddRange(ListItem[] items) {
 122                         for (int i = 0; i < items.Length; i++) {
 123                                 Add(items[i]);
 124
 125                                 if (tracking) {
 126                                         items [i].TrackViewState ();
 127                                         SetDirty ();
 128                                 }
 129                         }
 130                 }
 131
 132                 public void Clear() {
 133                         items.Clear();
 134
 135                         if (tracking)
 136                                 SetDirty ();
 137                 }
 138
 139                 public bool Contains(ListItem item) {
 140                         return items.Contains(item);
 141                 }
 142
 143                 public void CopyTo(Array array, int index) {
 144                         items.CopyTo(array, index);
 145                 }
 146
 147                 public ListItem FindByText (string text)
 148                 {
 149                         for (int i = 0; i < items.Count; i++)
 150                                 if (text == this [i].Text)
 151                                         return this [i];
 152
 153                         return null;
 154                 }
 155
 156                 public ListItem FindByValue (string value)
 157                 {
 158                         for (int i = 0; i < items.Count; i++)
 159                                 if (value == this [i].Value)
 160                                         return this [i];
 161
 162                         return null;
 163                 }
 164
 165                 public IEnumerator GetEnumerator() {
 166                         return items.GetEnumerator();
 167                 }
 168
 169                 public int IndexOf(ListItem item) {
 170                         return items.IndexOf(item);
 171                 }
 172
 173                 internal int IndexOf(string value) {
 174                         for (int i = 0; i < items.Count; i++)
 175                                 if (value == this [i].Value)
 176                                         return i;
 177                         return -1;
 178                 }
 179
 180                 public void Insert(int index, ListItem item) {
 181                         items.Insert(index, item);
 182
 183                         if (tracking) {
 184                                 item.TrackViewState ();
 185                                 lastDirty = index;
 186                                 SetDirty ();
 187                         }
 188                 }
 189
 190                 public void Insert(int index, string item) {
 191                         ListItem listItem = new ListItem(item);
 192                         items.Insert (index, listItem);
 193
 194                         if (tracking) {
 195                                 listItem.TrackViewState ();
 196                                 lastDirty = index;
 197                                 SetDirty ();
 198                         }
 199                 }
 200
 201                 public void Remove(ListItem item) {
 202                         items.Remove(item);
 203
 204                         if (tracking)
 205                                 SetDirty ();
 206                 }
 207
 208                 public void Remove (string item)
 209                 {
 210                         for (int i = 0; i < items.Count; i++)
 211                                 if (item == this [i].Value) {
 212                                         items.RemoveAt (i);
 213
 214                                         if (tracking)
 215                                                 SetDirty ();
 216                                 }
 217                 }
 218
 219                 public void RemoveAt(int index) {
 220                         items.RemoveAt(index);
 221
 222                         if (tracking)
 223                                 SetDirty ();
 224                 }
 225 #endregion      // Public Instance Methods
 226
 227 #region Interface methods
 228                 bool IList.IsFixedSize {
 229                         get {
 230                                 return items.IsFixedSize;
 231                         }
 232                 }
 233
 234                 object IList.this[int index] {
 235                         get {
 236                                 return this[index];
 237                         }
 238
 239                         set {
 240                                 if ((index >= 0) && (index < items.Count)) {
 241                                         items[index] = (ListItem)value;
 242
 243                                         if (tracking)
 244                                                 ((ListItem) value).TrackViewState ();
 245                                 }
 246                         }
 247                 }
 248
 249                 int IList.Add(object value) {
 250                         int i = items.Add ((ListItem) value);
 251
 252                         if (tracking) {
 253                                 ((IStateManager) value).TrackViewState ();
 254                                 SetDirty ();
 255                         }
 256                         return i;
 257                 }
 258
 259                 bool IList.Contains(object value) {
 260                         return Contains((ListItem)value);
 261                 }
 262
 263                 int IList.IndexOf(object value) {
 264                         return IndexOf((ListItem)value);
 265                 }
 266
 267                 void IList.Insert(int index, object value) {
 268                         Insert(index, (ListItem)value);
 269                 }
 270
 271                 void IList.Remove(object value) {
 272                         Remove((ListItem)value);
 273                 }
 274
 275                 bool IStateManager.IsTrackingViewState {
 276                         get {
 277                                 return tracking;
 278                         }
 279                 }
 280
 281                 void IStateManager.LoadViewState (object savedState) {
 282                         Pair pair = savedState as Pair;
 283                         if (pair == null)
 284                                 return;
 285
 286                         bool newCollection = (bool) pair.First;
 287                         object [] itemsArray = (object []) pair.Second;
 288             int count = itemsArray==null ? 0 : itemsArray.Length;
 289
 290             if (newCollection)
 291                 if (count > 0)
 292                     items = new ArrayList(count);
 293                 else
 294                     items = new ArrayList();
 295
 296                         for (int i = 0; i < count; i++) {
 297                                 ListItem item = new ListItem ();
 298
 299                                 if (newCollection) {
 300                                         item.LoadViewState (itemsArray [i]);
 301                                         item.SetDirty ();
 302                                         Add (item);
 303                                 }
 304                                 else{
 305                                         if (itemsArray [i] != null){
 306                                                 item.LoadViewState (itemsArray [i]);
 307                                                 item.SetDirty ();
 308                                                 items [i] = item;
 309                                         }
 310                                 }
 311                         }
 312                 }
 313
 314                 object IStateManager.SaveViewState() {
 315                         int count;
 316                         bool itemsDirty = false;
 317
 318                         count = items.Count;
 319                         if (count == 0 && !dirty)
 320                                 return null;
 321
 322                         object [] itemsState = null;
 323                         if (count > 0)
 324                                 itemsState = new object [count];
 325 #if NET_2_0
 326                         ListItem li;
 327                         bool enabled = ItemsEnabled;
 328 #endif
 329                         for (int i = 0; i < count; i++) {
 330 #if NET_2_0
 331                                 li = items [i] as ListItem;
 332                                 if (li != null && li.Enabled != enabled)
 333                                         li.Enabled = enabled;
 334 #endif
 335
 336                                 itemsState [i] = ((IStateManager) items [i]).SaveViewState ();
 337                                 if (itemsState [i] != null)
 338                                         itemsDirty = true;
 339                         }
 340
 341                         if (!dirty && !itemsDirty)
 342                                 return null;
 343
 344                         return new Pair (dirty, itemsState);
 345                 }
 346
 347                 void IStateManager.TrackViewState() {
 348                         tracking = true;
 349
 350                         for (int i = 0; i < items.Count; i++) {
 351                                 ((ListItem)items[i]).TrackViewState();
 352                         }
 353                 }
 354 #endregion      // Interface methods
 355
 356                 void SetDirty ()
 357                 {
 358                         dirty = true;
 359                         for (int i = lastDirty; i < items.Count; i++)
 360                                 ((ListItem) items [i]).SetDirty ();
 361
 362                         lastDirty = items.Count - 1;
 363                         if (lastDirty < 0)
 364                                 lastDirty = 0;
 365                 }
 366         }
 367 }