mcs/class/System.Web/System.Web.UI.WebControls/ListControl.cs

   1 //
   2 // System.Web.UI.WebControls.ListControl.cs
   3 //
   4 // Authors:
   5 //      Jackson Harper (jackson@ximian.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Drawing;
  31 using System.Web.Util;
  32 using System.Collections;
  33 using System.Globalization;
  34 using System.ComponentModel;
  35 using System.Collections.Specialized;
  36
  37 namespace System.Web.UI.WebControls {
  38
  39         [DataBindingHandler("System.Web.UI.Design.WebControls.ListControlDataBindingHandler, " + Consts.AssemblySystem_Design)]
  40         [DefaultEventAttribute ("SelectedIndexChanged")]
  41 #if !NET_2_0
  42         [DefaultPropertyAttribute ("DataSource")]
  43 #endif
  44         [Designer("System.Web.UI.Design.WebControls.ListControlDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  45         [ParseChildrenAttribute (true, "Items")]
  46 #if NET_2_0
  47         [ControlValueProperty ("SelectedValue", null)]
  48 #endif
  49         public abstract class ListControl :
  50 #if NET_2_0
  51         DataBoundControl, IEditableTextControl, ITextControl
  52 #else
  53         WebControl
  54 #endif
  55         {
  56
  57                 static readonly object SelectedIndexChangedEvent = new object ();
  58 #if NET_2_0
  59                 static readonly object TextChangedEvent = new object ();
  60 #endif
  61
  62                 ListItemCollection items;
  63 #if NET_2_0
  64                 int _selectedIndex = -2;
  65                 string _selectedValue;
  66 #else
  67                 int saved_selected_index = -2;
  68                 string saved_selected_value;
  69 #endif
  70
  71                 public ListControl () : base (HtmlTextWriterTag.Select)
  72                 {
  73                 }
  74
  75 #if NET_2_0
  76                 [DefaultValue (false)]
  77                 [Themeable (false)]
  78                 [WebSysDescription ("")]
  79                 [WebCategory ("Behavior")]
  80                 public virtual bool AppendDataBoundItems
  81                 {
  82                         get {
  83                                 return ViewState.GetBool ("AppendDataBoundItems", false);
  84                         }
  85                         set {
  86                                 ViewState ["AppendDataBoundItems"] = value;
  87                                 if (Initialized)
  88                                         RequiresDataBinding = true;
  89                         }
  90                 }
  91 #endif
  92
  93 #if NET_2_0
  94                 [Themeable (false)]
  95 #endif
  96                 [DefaultValue(false)]
  97                 [WebSysDescription ("")]
  98                 [WebCategory ("Behavior")]
  99                 public virtual bool AutoPostBack {
 100                         get { return ViewState.GetBool ("AutoPostBack", false); }
 101                         set { ViewState ["AutoPostBack"] = value; }
 102                 }
 103
 104 #if ONLY_1_1
 105                 [DefaultValue("")]
 106                 [WebSysDescription ("")]
 107                 [WebCategory ("Data")]
 108                 public virtual string DataMember {
 109                         get { return ViewState.GetString ("DataMember", String.Empty); }
 110                         set { ViewState ["DataMember"] = value; }
 111                 }
 112
 113                 object data_source;
 114
 115                 [Bindable(true)]
 116                 [DefaultValue(null)]
 117                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 118                 [WebSysDescription ("")]
 119                 [WebCategory ("Data")]
 120                 public virtual object DataSource {
 121                         get { return data_source; }
 122                         set {
 123                                 if(value == null || value is IListSource || value is IEnumerable) {
 124                                         data_source = value;
 125                                         return;
 126                                 }
 127                                 throw new ArgumentException("Invalid DataSource Type");
 128                         }
 129                 }
 130 #endif
 131
 132 #if NET_2_0
 133                 [Themeable (false)]
 134 #endif
 135                 [DefaultValue("")]
 136                 [WebSysDescription ("")]
 137                 [WebCategory ("Data")]
 138                 public virtual string DataTextField {
 139                         get { return ViewState.GetString ("DataTextField", String.Empty); }
 140                         set {
 141                                 ViewState ["DataTextField"] = value;
 142 #if NET_2_0
 143                                 if (Initialized)
 144                                         RequiresDataBinding = true;
 145 #endif
 146                         }
 147                 }
 148
 149 #if NET_2_0
 150                 [Themeable (false)]
 151 #endif
 152                 [DefaultValue("")]
 153                 [WebSysDescription ("")]
 154                 [WebCategory ("Data")]
 155                 public virtual string DataTextFormatString {
 156                         get { return ViewState.GetString ("DataTextFormatString", String.Empty); }
 157                         set {
 158                                 ViewState ["DataTextFormatString"] = value;
 159 #if NET_2_0
 160                                 if (Initialized)
 161                                         RequiresDataBinding = true;
 162 #endif
 163                         }
 164                 }
 165
 166 #if NET_2_0
 167                 [Themeable (false)]
 168 #endif
 169                 [DefaultValue("")]
 170                 [WebSysDescription ("")]
 171                 [WebCategory ("Data")]
 172                 public virtual string DataValueField {
 173                         get { return ViewState.GetString ("DataValueField", String.Empty); }
 174                         set {
 175                                 ViewState ["DataValueField"] = value;
 176 #if NET_2_0
 177                                 if (Initialized)
 178                                         RequiresDataBinding = true;
 179 #endif
 180                         }
 181                 }
 182
 183 #if NET_2_0
 184                 [Editor ("System.Web.UI.Design.WebControls.ListItemsCollectionEditor," + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
 185 #endif
 186                 [DefaultValue(null)]
 187                 [MergableProperty(false)]
 188                 [PersistenceMode(PersistenceMode.InnerDefaultProperty)]
 189                 [WebSysDescription ("")]
 190                 [WebCategory ("Misc")]
 191                 public virtual ListItemCollection Items {
 192                         get {
 193                                 if (items == null) {
 194                                         items = new ListItemCollection ();
 195                                         if (IsTrackingViewState)
 196                                                 ((IStateManager) items).TrackViewState ();
 197                                 }
 198                                 return items;
 199                         }
 200                 }
 201
 202                 // I can't find this info stored in the viewstate anywhere
 203                 // so it must be calculated on the fly.
 204                 [Bindable(true)]
 205                 [Browsable(false)]
 206                 [DefaultValue(0)]
 207                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 208 #if NET_2_0
 209                 [Themeable (false)]
 210 #endif
 211                 [WebSysDescription ("")]
 212                 [WebCategory ("Misc")]
 213                 public virtual int SelectedIndex {
 214                         get {
 215                                 if (items == null)
 216                                         return -1;
 217                                 for (int i = 0; i < items.Count; i++) {
 218                                         if (items [i].Selected)
 219                                                 return i;
 220                                 }
 221                                 return -1;
 222                         }
 223                         set {
 224 #if NET_2_0
 225                                 _selectedIndex = value;
 226
 227                                 if (value < -1)
 228                                         throw new ArgumentOutOfRangeException ("value");
 229
 230                                 if (value >= Items.Count)
 231                                         return;
 232
 233                                 ClearSelection ();
 234                                 if (value == -1)
 235                                         return;
 236
 237                                 items [value].Selected = true;
 238
 239                                 /* you'd think this would be called, but noooo */
 240                                 //OnSelectedIndexChanged (EventArgs.Empty);
 241 #else
 242                                 if (items == null || items.Count == 0) {
 243                                         // This will happen when assigning this property
 244                                         // before DataBind () is called on the control.
 245                                         saved_selected_index = value;
 246                                         return;
 247                                 }
 248
 249                                 if (value < -1 || value >= Items.Count)
 250                                         throw new ArgumentOutOfRangeException ("value");
 251
 252                                 ClearSelection ();
 253                                 if (value == -1)
 254                                         return;
 255
 256                                 items [value].Selected = true;
 257
 258                                 /* you'd think this would be called, but noooo */
 259                                 //OnSelectedIndexChanged (EventArgs.Empty);
 260 #endif
 261                         }
 262                 }
 263
 264                 [Browsable(false)]
 265                 [DefaultValue(null)]
 266                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 267                 [WebSysDescription ("")]
 268                 [WebCategory ("Misc")]
 269                 public virtual ListItem SelectedItem {
 270                         get {
 271                                 int si = SelectedIndex;
 272                                 if (si == -1)
 273                                         return null;
 274                                 return Items [si];
 275                         }
 276                 }
 277
 278 #if NET_2_0
 279                 [Bindable(true, BindingDirection.TwoWay)]
 280                 [Themeable (false)]
 281 #else
 282                 [Bindable(true)]
 283 #endif
 284                 [Browsable(false)]
 285                 [DefaultValue("")]
 286                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 287                 [WebSysDescription ("")]
 288                 [WebCategory ("Misc")]
 289                 public virtual string SelectedValue {
 290                         get {
 291                                 int si = SelectedIndex;
 292                                 if (si == -1)
 293                                         return String.Empty;
 294                                 return Items [si].Value;
 295                         }
 296                         set {
 297 #if NET_2_0
 298                                 _selectedValue = value;
 299                                 SetSelectedValue (value);
 300 #else
 301                                 ClearSelection ();
 302                                 if (items == null || items.Count == 0) {
 303                                         // This will happen when assigning this property
 304                                         // before DataBind () is called on the control.
 305                                         saved_selected_value = value;
 306                                         return;
 307                                 }
 308
 309                                 int count = Items.Count;
 310                                 ListItemCollection coll = Items;
 311                                 bool thr = true;
 312                                 for (int i = 0; i < count; i++) {
 313                                         if (coll [i].Value == value) {
 314                                                 coll [i].Selected = true;
 315                                                 thr = false;
 316                                         }
 317                                 }
 318
 319                                 if (thr) {
 320                                         string msg = String.Format ("Argument value is out of range: {0}", value);
 321                                         throw new ArgumentOutOfRangeException (msg);
 322                                 }
 323 #endif
 324                         }
 325                 }
 326
 327 #if NET_2_0
 328                 bool SetSelectedValue (string value)
 329                 {
 330                         if (items != null && items.Count > 0) {
 331                                 int count = items.Count;
 332                                 ListItemCollection coll = Items;
 333                                 for (int i = 0; i < count; i++) {
 334                                         if (coll [i].Value == value) {
 335                                                 ClearSelection ();
 336                                                 coll [i].Selected = true;
 337                                                 return true;
 338                                         }
 339                                 }
 340                         }
 341                         return false;
 342                 }
 343
 344                 [Themeable (false)]
 345                 [DefaultValue ("")]
 346                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 347                 [Browsable (false)]
 348                 [WebSysDescription ("")]
 349                 [WebCategoryAttribute ("Behavior")]
 350                 public virtual string Text {
 351                         get {
 352                                 return SelectedValue;
 353                         }
 354                         set {
 355                                 SelectedValue = value;
 356                                 /* you'd think this would be called, but noooo */
 357                                 //OnTextChanged (EventArgs.Empty);
 358                         }
 359                 }
 360
 361 #if HAVE_CONTROL_ADAPTERS
 362                 protected virtual new
 363 #else
 364                 protected override
 365 #endif
 366                 HtmlTextWriterTag TagKey
 367                 {
 368                         get {
 369                                 return HtmlTextWriterTag.Select;
 370                         }
 371                 }
 372
 373                 protected override void AddAttributesToRender (HtmlTextWriter w)
 374                 {
 375                         base.AddAttributesToRender (w);
 376                 }
 377
 378 #endif
 379
 380                 public virtual void ClearSelection ()
 381                 {
 382                         if (items == null)
 383                                 return;
 384
 385                         int count = Items.Count;
 386                         for (int i = 0; i<count; i++)
 387                                 items [i].Selected = false;
 388                 }
 389
 390                 protected override void OnDataBinding (EventArgs e)
 391                 {
 392                         base.OnDataBinding (e);
 393 #if !NET_2_0
 394                         IEnumerable list = DataSourceResolver.ResolveDataSource (DataSource, DataMember);
 395                         PerformDataBinding (list);
 396 #else
 397                         IEnumerable list = GetData ().ExecuteSelect (DataSourceSelectArguments.Empty);
 398                         InternalPerformDataBinding (list);
 399 #endif
 400                 }
 401
 402 #if NET_2_0
 403                 protected internal
 404 #else
 405                 protected
 406 #endif
 407                 override void OnPreRender (EventArgs e)
 408                 {
 409                         base.OnPreRender (e);
 410 #if NET_2_0
 411                         if (Page != null && Enabled)
 412                                 Page.RegisterEnabledControl (this);
 413 #endif
 414                 }
 415
 416 #if NET_2_0
 417                 protected virtual void OnTextChanged (EventArgs e)
 418                 {
 419                         EventHandler handler = (EventHandler) Events [TextChangedEvent];
 420                         if (handler != null)
 421                                 handler (this, e);
 422                 }
 423 #endif
 424
 425 #if NET_2_0
 426                 protected internal override
 427 #endif
 428                 void PerformDataBinding (IEnumerable dataSource)
 429                 {
 430                         if (dataSource == null)
 431 #if NET_2_0
 432                                 goto setselected;
 433 #else
 434                                 return;
 435 #endif
 436 #if NET_2_0
 437                         if (!AppendDataBoundItems)
 438 #endif
 439                                 Items.Clear ();
 440
 441                         string format = DataTextFormatString;
 442                         if (format.Length == 0)
 443                                 format = null;
 444
 445                         string text_field = DataTextField;
 446                         string value_field = DataValueField;
 447
 448                         if (text_field.Length == 0)
 449                                 text_field = null;
 450                         if (value_field.Length == 0)
 451                                 value_field = null;
 452
 453                         ListItemCollection coll = Items;
 454                         foreach (object container in dataSource) {
 455                                 string text;
 456                                 string val;
 457
 458                                 text = val = null;
 459                                 if (text_field != null)
 460                                         text = DataBinder.GetPropertyValue (container, text_field, format);
 461
 462                                 if (value_field != null)
 463                                         val = DataBinder.GetPropertyValue (container, value_field).ToString ();
 464                                 else if (text_field == null) {
 465                                         text = val = container.ToString ();
 466                                         if (format != null)
 467                                                 text = String.Format (format, container);
 468                                 } else if (text != null)
 469                                         val = text;
 470
 471                                 if (text == null)
 472                                         text = val;
 473
 474                                 coll.Add (new ListItem (text, val));
 475                         }
 476
 477 #if NET_2_0
 478                 setselected:
 479                         if (!String.IsNullOrEmpty (_selectedValue)) {
 480                                 if (!SetSelectedValue (_selectedValue))
 481                                         throw new ArgumentOutOfRangeException ("value", String.Format ("'{0}' has a SelectedValue which is invalid because it does not exist in the list of items.", ID));
 482                                 if (_selectedIndex >= 0 && _selectedIndex != SelectedIndex)
 483                                         throw new ArgumentException ("SelectedIndex and SelectedValue are mutually exclusive.");
 484                         }
 485                         else if (_selectedIndex >= 0) {
 486                                 SelectedIndex = _selectedIndex;
 487                         }
 488 #else
 489                         if (saved_selected_value != null) {
 490                                 SelectedValue = saved_selected_value;
 491                                 if (saved_selected_index != -2 && saved_selected_index != SelectedIndex)
 492                                         throw new ArgumentException ("SelectedIndex and SelectedValue are mutually exclusive.");
 493                         }
 494                         else if (saved_selected_index != -2) {
 495                                 SelectedIndex = saved_selected_index;
 496                                 // No need to check saved_selected_value here, as it's done before.
 497                         }
 498 #endif
 499                 }
 500
 501 #if NET_2_0
 502                 [MonoTODO ("why override?")]
 503                 protected override void PerformSelect ()
 504                 {
 505                         OnDataBinding (EventArgs.Empty);
 506                         RequiresDataBinding = false;
 507                         MarkAsDataBound ();
 508                         OnDataBound (EventArgs.Empty);
 509                 }
 510
 511                 protected internal override void RenderContents (HtmlTextWriter writer)
 512                 {
 513                         bool selected = false;
 514                         Page page = Page;
 515                         for (int i = 0; i < Items.Count; i++) {
 516                                 ListItem item = Items [i];
 517                                 if (page != null)
 518                                         page.ClientScript.RegisterForEventValidation (UniqueID, item.Value);
 519                                 writer.WriteBeginTag ("option");
 520                                 if (item.Selected) {
 521                                         if (selected)
 522                                                 VerifyMultiSelect ();
 523                                         writer.WriteAttribute ("selected", "selected", false);
 524                                         selected = true;
 525                                 }
 526                                 writer.WriteAttribute ("value", item.Value, true);
 527
 528                                 if (item.HasAttributes)
 529                                         item.Attributes.Render (writer);
 530
 531                                 writer.Write (">");
 532                                 string encoded = HttpUtility.HtmlEncode (item.Text);
 533                                 writer.Write (encoded);
 534                                 writer.WriteEndTag ("option");
 535                                 writer.WriteLine ();
 536                         }
 537                 }
 538
 539 #endif
 540
 541                 internal ArrayList GetSelectedIndicesInternal ()
 542                 {
 543                         ArrayList selected = null;
 544                         int count;
 545
 546                         if (items != null && (count = items.Count) > 0) {
 547                                 selected = new ArrayList ();
 548                                 for (int i = 0; i < count; i++) {
 549                                         if (items [i].Selected)
 550                                                 selected.Add (i);
 551                                 }
 552                         }
 553                         return selected;
 554                 }
 555
 556                 protected override object SaveViewState ()
 557                 {
 558                         object baseState = null;
 559                         object itemsState = null;
 560
 561                         baseState = base.SaveViewState ();
 562
 563                         IStateManager manager = items as IStateManager;
 564                         if (manager != null) {
 565                                 items.ItemsEnabled = Enabled;
 566                                 itemsState = manager.SaveViewState ();
 567                         }
 568
 569                         if (baseState == null && itemsState == null)
 570                                 return null;
 571
 572                         return new Pair (baseState, itemsState);
 573                 }
 574
 575                 protected override void LoadViewState (object savedState)
 576                 {
 577                         object baseState = null;
 578                         object itemsState = null;
 579
 580                         Pair pair = savedState as Pair;
 581                         if (pair != null) {
 582                                 baseState = pair.First;
 583                                 itemsState = pair.Second;
 584                         }
 585
 586                         base.LoadViewState (baseState);
 587
 588                         if (itemsState != null) {
 589                                 IStateManager manager = Items as IStateManager;
 590                                 manager.LoadViewState (itemsState);
 591                         }
 592                 }
 593
 594 #if NET_2_0
 595                 [MonoTODO ("Not implemented")]
 596                 protected void SetPostDataSelection (int selectedIndex)
 597                 {
 598                         throw new NotImplementedException ();
 599                 }
 600 #endif
 601
 602                 protected override void TrackViewState ()
 603                 {
 604                         base.TrackViewState ();
 605                         IStateManager manager = items as IStateManager;
 606                         if (manager != null)
 607                                 manager.TrackViewState ();
 608                 }
 609
 610                 protected virtual void OnSelectedIndexChanged (EventArgs e)
 611                 {
 612                         EventHandler handler = (EventHandler) Events [SelectedIndexChangedEvent];
 613                         if (handler != null)
 614                                 handler (this, e);
 615                 }
 616
 617 #if NET_2_0
 618                 protected internal virtual void VerifyMultiSelect ()
 619                 {
 620             throw new HttpException("Multi select is not supported");
 621                 }
 622 #endif
 623
 624                 [WebSysDescription ("")]
 625                 [WebCategory ("Action")]
 626                 public event EventHandler SelectedIndexChanged {
 627                         add { Events.AddHandler (SelectedIndexChangedEvent, value); }
 628                         remove { Events.RemoveHandler (SelectedIndexChangedEvent, value); }
 629                 }
 630
 631 #if NET_2_0
 632                 /* sealed in the docs */
 633                 public event EventHandler TextChanged {
 634                         add {
 635                                 Events.AddHandler (TextChangedEvent, value);
 636                         }
 637                         remove {
 638                                 Events.RemoveHandler (TextChangedEvent, value);
 639                         }
 640                 }
 641
 642
 643                 [Themeable (false)]
 644                 [DefaultValue (false)]
 645                 [WebSysDescription ("")]
 646                 [WebCategory ("Behavior")]
 647                 public virtual bool CausesValidation {
 648                         get {
 649                                 return ViewState.GetBool ("CausesValidation", false);
 650                         }
 651
 652                         set {
 653                                 ViewState ["CausesValidation"] = value;
 654                         }
 655                 }
 656
 657                 [Themeable (false)]
 658                 [DefaultValue ("")]
 659                 [WebSysDescription ("")]
 660                 [WebCategoryAttribute ("Behavior")]
 661                 public virtual string ValidationGroup {
 662                         get {
 663                                 return ViewState.GetString ("ValidationGroup", "");
 664                         }
 665                         set {
 666                                 ViewState ["ValidationGroup"] = value;
 667                         }
 668                 }
 669
 670
 671 #endif
 672         }
 673 }
 674
 675
 676
 677
 678