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