mcs/class/Managed.Windows.Forms/System.Windows.Forms/ListView.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) 2004-2005 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Ravindra Kumar (rkumar@novell.com)
  24 //      Jordi Mas i Hernandez, jordi@ximian.com
  25 //      Mike Kestner (mkestner@novell.com)
  26 //
  27 // TODO:
  28 //   - Feedback for item activation, change in cursor types as mouse moves.
  29 //   - HideSelection
  30 //   - LabelEdit
  31 //   - Drag and drop
  32
  33
  34 // NOT COMPLETE
  35
  36
  37 using System.Collections;
  38 using System.ComponentModel;
  39 using System.ComponentModel.Design;
  40 using System.Drawing;
  41 using System.Runtime.InteropServices;
  42 using System.Globalization;
  43
  44 namespace System.Windows.Forms
  45 {
  46         [DefaultEvent ("SelectedIndexChanged")]
  47         [DefaultProperty ("Items")]
  48         [Designer ("System.Windows.Forms.Design.ListViewDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  49         public class ListView : Control
  50         {
  51                 private ItemActivation activation = ItemActivation.Standard;
  52                 private ListViewAlignment alignment = ListViewAlignment.Top;
  53                 private bool allow_column_reorder = false;
  54                 private bool auto_arrange = true;
  55                 private bool check_boxes = false;
  56                 private CheckedIndexCollection checked_indices;
  57                 private CheckedListViewItemCollection checked_items;
  58                 private ColumnHeaderCollection columns;
  59                 internal ListViewItem focused_item;
  60                 private bool full_row_select = false;
  61                 private bool grid_lines = false;
  62                 private ColumnHeaderStyle header_style = ColumnHeaderStyle.Clickable;
  63                 private bool hide_selection = true;
  64                 private bool hover_selection = false;
  65                 private IComparer item_sorter;
  66                 private ListViewItemCollection items;
  67                 private bool label_edit = false;
  68                 private bool label_wrap = true;
  69                 private bool multiselect = true;
  70                 private bool scrollable = true;
  71                 private SelectedIndexCollection selected_indices;
  72                 private SelectedListViewItemCollection selected_items;
  73                 private SortOrder sort_order = SortOrder.None;
  74                 private ImageList state_image_list;
  75                 private bool updating = false;
  76                 private View view = View.LargeIcon;
  77                 private int layout_wd;    // We might draw more than our client area
  78                 private int layout_ht;    // therefore we need to have these two.
  79                 //private TextBox editor;   // Used for editing an item text
  80                 HeaderControl header_control;
  81                 internal ItemControl item_control;
  82                 internal ScrollBar h_scroll; // used for scrolling horizontally
  83                 internal ScrollBar v_scroll; // used for scrolling vertically
  84                 internal int h_marker;          // Position markers for scrolling
  85                 internal int v_marker;
  86                 private int keysearch_tickcnt;
  87                 private string keysearch_text;
  88                 static private readonly int keysearch_keydelay = 1000;
  89                 private int[] reordered_column_indices;
  90
  91                 // internal variables
  92                 internal ImageList large_image_list;
  93                 internal ImageList small_image_list;
  94                 internal Size text_size = Size.Empty;
  95
  96                 #region Events
  97                 public event LabelEditEventHandler AfterLabelEdit;
  98
  99                 [Browsable (false)]
 100                 [EditorBrowsable (EditorBrowsableState.Never)]
 101                 public new event EventHandler BackgroundImageChanged {
 102                         add { base.BackgroundImageChanged += value; }
 103                         remove { base.BackgroundImageChanged -= value; }
 104                 }
 105
 106                 public event LabelEditEventHandler BeforeLabelEdit;
 107                 public event ColumnClickEventHandler ColumnClick;
 108                 public event EventHandler ItemActivate;
 109                 public event ItemCheckEventHandler ItemCheck;
 110                 public event ItemDragEventHandler ItemDrag;
 111
 112                 [Browsable (false)]
 113                 [EditorBrowsable (EditorBrowsableState.Never)]
 114                 public new event PaintEventHandler Paint {
 115                         add { base.Paint += value; }
 116                         remove { base.Paint -= value; }
 117                 }
 118
 119                 public event EventHandler SelectedIndexChanged;
 120
 121                 [Browsable (false)]
 122                 [EditorBrowsable (EditorBrowsableState.Never)]
 123                 public new event EventHandler TextChanged {
 124                         add { base.TextChanged += value; }
 125                         remove { base.TextChanged -= value; }
 126                 }
 127
 128                 #endregion // Events
 129
 130                 #region Public Constructors
 131                 public ListView ()
 132                 {
 133                         background_color = ThemeEngine.Current.ColorWindow;
 134                         checked_indices = new CheckedIndexCollection (this);
 135                         checked_items = new CheckedListViewItemCollection (this);
 136                         columns = new ColumnHeaderCollection (this);
 137                         foreground_color = SystemColors.WindowText;
 138                         items = new ListViewItemCollection (this);
 139                         selected_indices = new SelectedIndexCollection (this);
 140                         selected_items = new SelectedListViewItemCollection (this);
 141
 142                         border_style = BorderStyle.Fixed3D;
 143
 144                         header_control = new HeaderControl (this);
 145                         header_control.Visible = false;
 146                         Controls.AddImplicit (header_control);
 147
 148                         item_control = new ItemControl (this);
 149                         Controls.AddImplicit (item_control);
 150
 151                         h_scroll = new HScrollBar ();
 152                         Controls.AddImplicit (this.h_scroll);
 153
 154                         v_scroll = new VScrollBar ();
 155                         Controls.AddImplicit (this.v_scroll);
 156
 157                         h_marker = v_marker = 0;
 158                         keysearch_tickcnt = 0;
 159
 160                         // scroll bars are disabled initially
 161                         h_scroll.Visible = false;
 162                         h_scroll.ValueChanged += new EventHandler(HorizontalScroller);
 163                         v_scroll.Visible = false;
 164                         v_scroll.ValueChanged += new EventHandler(VerticalScroller);
 165
 166                         // event handlers
 167                         base.KeyDown += new KeyEventHandler(ListView_KeyDown);
 168                         SizeChanged += new EventHandler (ListView_SizeChanged);
 169
 170                         this.SetStyle (ControlStyles.UserPaint | ControlStyles.StandardClick, false);
 171                 }
 172                 #endregion      // Public Constructors
 173
 174                 #region Private Internal Properties
 175                 internal Size CheckBoxSize {
 176                         get {
 177                                 if (this.check_boxes) {
 178                                         if (this.state_image_list != null)
 179                                                 return this.state_image_list.ImageSize;
 180                                         else
 181                                                 return ThemeEngine.Current.ListViewCheckBoxSize;
 182                                 }
 183                                 return Size.Empty;
 184                         }
 185                 }
 186
 187                 bool multiselecting;
 188
 189                 bool CanMultiselect {
 190                         get {
 191                                 if (multiselecting)
 192                                         return true;
 193                                 else if (multiselect && (XplatUI.State.ModifierKeys & (Keys.Control | Keys.Shift)) != 0)
 194                                         return true;
 195                                 else
 196                                         return false;
 197                         }
 198                 }
 199
 200                 #endregion      // Private Internal Properties
 201
 202                 #region  Protected Properties
 203                 protected override CreateParams CreateParams {
 204                         get { return base.CreateParams; }
 205                 }
 206
 207                 protected override Size DefaultSize {
 208                         get { return ThemeEngine.Current.ListViewDefaultSize; }
 209                 }
 210                 #endregion      // Protected Properties
 211
 212                 #region Public Instance Properties
 213                 [DefaultValue (ItemActivation.Standard)]
 214                 public ItemActivation Activation {
 215                         get { return activation; }
 216                         set {
 217                                 if (value != ItemActivation.Standard && value != ItemActivation.OneClick &&
 218                                         value != ItemActivation.TwoClick) {
 219                                         throw new InvalidEnumArgumentException (string.Format
 220                                                 ("Enum argument value '{0}' is not valid for Activation", value));
 221                                 }
 222
 223                                 activation = value;
 224                         }
 225                 }
 226
 227                 [DefaultValue (ListViewAlignment.Top)]
 228                 [Localizable (true)]
 229                 public ListViewAlignment Alignment {
 230                         get { return alignment; }
 231                         set {
 232                                 if (value != ListViewAlignment.Default && value != ListViewAlignment.Left &&
 233                                         value != ListViewAlignment.SnapToGrid && value != ListViewAlignment.Top) {
 234                                         throw new InvalidEnumArgumentException (string.Format
 235                                                 ("Enum argument value '{0}' is not valid for Alignment", value));
 236                                 }
 237
 238                                 if (this.alignment != value) {
 239                                         alignment = value;
 240                                         // alignment does not matter in Details/List views
 241                                         if (this.view == View.LargeIcon ||
 242                                             this.View == View.SmallIcon)
 243                                                 this.Redraw (true);
 244                                 }
 245                         }
 246                 }
 247
 248                 [DefaultValue (false)]
 249                 public bool AllowColumnReorder {
 250                         get { return allow_column_reorder; }
 251                         set { allow_column_reorder = value; }
 252                 }
 253
 254                 [DefaultValue (true)]
 255                 public bool AutoArrange {
 256                         get { return auto_arrange; }
 257                         set {
 258                                 if (auto_arrange != value) {
 259                                         auto_arrange = value;
 260                                         // autoarrange does not matter in Details/List views
 261                                         if (this.view == View.LargeIcon || this.View == View.SmallIcon)
 262                                                 this.Redraw (true);
 263                                 }
 264                         }
 265                 }
 266
 267                 public override Color BackColor {
 268                         get {
 269                                 if (background_color.IsEmpty)
 270                                         return ThemeEngine.Current.ColorWindow;
 271                                 else
 272                                         return background_color;
 273                         }
 274                         set { background_color = value; }
 275                 }
 276
 277                 [Browsable (false)]
 278                 [EditorBrowsable (EditorBrowsableState.Never)]
 279                 public override Image BackgroundImage {
 280                         get { return background_image; }
 281                         set {
 282                                 if (value == background_image)
 283                                         return;
 284
 285                                 background_image = value;
 286                                 OnBackgroundImageChanged (EventArgs.Empty);
 287                         }
 288                 }
 289
 290                 [DefaultValue (BorderStyle.Fixed3D)]
 291                 [DispId (-504)]
 292                 public BorderStyle BorderStyle {
 293                         get { return InternalBorderStyle; }
 294                         set { InternalBorderStyle = value; }
 295                 }
 296
 297                 [DefaultValue (false)]
 298                 public bool CheckBoxes {
 299                         get { return check_boxes; }
 300                         set {
 301                                 if (check_boxes != value) {
 302                                         check_boxes = value;
 303                                         this.Redraw (true);
 304                                 }
 305                         }
 306                 }
 307
 308                 [Browsable (false)]
 309                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 310                 public CheckedIndexCollection CheckedIndices {
 311                         get { return checked_indices; }
 312                 }
 313
 314                 [Browsable (false)]
 315                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 316                 public CheckedListViewItemCollection CheckedItems {
 317                         get { return checked_items; }
 318                 }
 319
 320                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 321                 [Localizable (true)]
 322                 [MergableProperty (false)]
 323                 public ColumnHeaderCollection Columns {
 324                         get { return columns; }
 325                 }
 326
 327                 [Browsable (false)]
 328                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 329                 public ListViewItem FocusedItem {
 330                         get {
 331                                 return focused_item;
 332                         }
 333                 }
 334
 335                 public override Color ForeColor {
 336                         get {
 337                                 if (foreground_color.IsEmpty)
 338                                         return ThemeEngine.Current.ColorWindowText;
 339                                 else
 340                                         return foreground_color;
 341                         }
 342                         set { foreground_color = value; }
 343                 }
 344
 345                 [DefaultValue (false)]
 346                 public bool FullRowSelect {
 347                         get { return full_row_select; }
 348                         set { full_row_select = value; }
 349                 }
 350
 351                 [DefaultValue (false)]
 352                 public bool GridLines {
 353                         get { return grid_lines; }
 354                         set {
 355                                 if (grid_lines != value) {
 356                                         grid_lines = value;
 357                                         this.Redraw (false);
 358                                 }
 359                         }
 360                 }
 361
 362                 [DefaultValue (ColumnHeaderStyle.Clickable)]
 363                 public ColumnHeaderStyle HeaderStyle {
 364                         get { return header_style; }
 365                         set {
 366                                 if (header_style == value)
 367                                         return;
 368
 369                                 switch (value) {
 370                                 case ColumnHeaderStyle.Clickable:
 371                                 case ColumnHeaderStyle.Nonclickable:
 372                                 case ColumnHeaderStyle.None:
 373                                         break;
 374                                 default:
 375                                         throw new InvalidEnumArgumentException (string.Format
 376                                                 ("Enum argument value '{0}' is not valid for ColumnHeaderStyle", value));
 377                                 }
 378
 379                                 header_style = value;
 380                                 if (view == View.Details)
 381                                         Redraw (true);
 382                         }
 383                 }
 384
 385                 [DefaultValue (true)]
 386                 public bool HideSelection {
 387                         get { return hide_selection; }
 388                         set {
 389                                 if (hide_selection != value) {
 390                                         hide_selection = value;
 391                                         this.Redraw (false);
 392                                 }
 393                         }
 394                 }
 395
 396                 [DefaultValue (false)]
 397                 public bool HoverSelection {
 398                         get { return hover_selection; }
 399                         set { hover_selection = value; }
 400                 }
 401
 402                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 403                 [Localizable (true)]
 404                 [MergableProperty (false)]
 405                 public ListViewItemCollection Items {
 406                         get { return items; }
 407                 }
 408
 409                 [DefaultValue (false)]
 410                 public bool LabelEdit {
 411                         get { return label_edit; }
 412                         set { label_edit = value; }
 413                 }
 414
 415                 [DefaultValue (true)]
 416                 [Localizable (true)]
 417                 public bool LabelWrap {
 418                         get { return label_wrap; }
 419                         set {
 420                                 if (label_wrap != value) {
 421                                         label_wrap = value;
 422                                         this.Redraw (true);
 423                                 }
 424                         }
 425                 }
 426
 427                 [DefaultValue (null)]
 428                 public ImageList LargeImageList {
 429                         get { return large_image_list; }
 430                         set {
 431                                 large_image_list = value;
 432                                 this.Redraw (true);
 433                         }
 434                 }
 435
 436                 [Browsable (false)]
 437                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 438                 public IComparer ListViewItemSorter {
 439                         get { return item_sorter; }
 440                         set { item_sorter = value; }
 441                 }
 442
 443                 [DefaultValue (true)]
 444                 public bool MultiSelect {
 445                         get { return multiselect; }
 446                         set { multiselect = value; }
 447                 }
 448
 449                 [DefaultValue (true)]
 450                 public bool Scrollable {
 451                         get { return scrollable; }
 452                         set {
 453                                 if (scrollable != value) {
 454                                         scrollable = value;
 455                                         this.Redraw (true);
 456                                 }
 457                         }
 458                 }
 459
 460                 [Browsable (false)]
 461                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 462                 public SelectedIndexCollection SelectedIndices {
 463                         get { return selected_indices; }
 464                 }
 465
 466                 [Browsable (false)]
 467                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 468                 public SelectedListViewItemCollection SelectedItems {
 469                         get { return selected_items; }
 470                 }
 471
 472 #if NET_2_0
 473                 [MonoTODO("Implement")]
 474                 public bool ShowGroups {
 475                         get {
 476                                 return false;
 477                         }
 478
 479                         set {
 480                         }
 481                 }
 482 #endif
 483
 484                 [DefaultValue (null)]
 485                 public ImageList SmallImageList {
 486                         get { return small_image_list; }
 487                         set {
 488                                 small_image_list = value;
 489                                 this.Redraw (true);
 490                         }
 491                 }
 492
 493                 [DefaultValue (SortOrder.None)]
 494                 public SortOrder Sorting {
 495                         get { return sort_order; }
 496                         set {
 497                                 if (value != SortOrder.Ascending && value != SortOrder.Descending  &&
 498                                         value != SortOrder.None) {
 499                                         throw new InvalidEnumArgumentException (string.Format
 500                                                 ("Enum argument value '{0}' is not valid for Sorting", value));
 501                                 }
 502
 503                                 if (sort_order != value)  {
 504                                         sort_order = value;
 505                                         this.Redraw (false);
 506                                 }
 507                         }
 508                 }
 509
 510                 [DefaultValue (null)]
 511                 public ImageList StateImageList {
 512                         get { return state_image_list; }
 513                         set {
 514                                 state_image_list = value;
 515                                 this.Redraw (true);
 516                         }
 517                 }
 518
 519                 [Bindable (false)]
 520                 [Browsable (false)]
 521                 [EditorBrowsable (EditorBrowsableState.Never)]
 522                 public override string Text {
 523                         get { return text; }
 524                         set {
 525                                 if (value == text)
 526                                         return;
 527
 528                                 text = value;
 529                                 this.Redraw (true);
 530
 531                                 OnTextChanged (EventArgs.Empty);
 532                         }
 533                 }
 534
 535                 [Browsable (false)]
 536                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 537                 public ListViewItem TopItem {
 538                         get {
 539                                 // there is no item
 540                                 if (this.items.Count == 0)
 541                                         return null;
 542                                 // if contents are not scrolled
 543                                 // it is the first item
 544                                 else if (h_marker == 0 && v_marker == 0)
 545                                         return this.items [0];
 546                                 // do a hit test for the scrolled position
 547                                 else {
 548                                         foreach (ListViewItem item in this.items) {
 549                                                 if (item.Bounds.X >= 0 && item.Bounds.Y >= 0)
 550                                                         return item;
 551                                         }
 552                                         return null;
 553                                 }
 554                         }
 555                 }
 556
 557 #if NET_2_0
 558                 [MonoTODO("Implement")]
 559                 public bool UseCompatibleStateImageBehavior {
 560                         get {
 561                                 return false;
 562                         }
 563
 564                         set {
 565                         }
 566                 }
 567 #endif
 568
 569                 [DefaultValue (View.LargeIcon)]
 570                 public View View {
 571                         get { return view; }
 572                         set {
 573                                 if (value != View.Details && value != View.LargeIcon  &&
 574                                         value != View.List  && value != View.SmallIcon  ) {
 575                                         throw new InvalidEnumArgumentException (string.Format
 576                                                 ("Enum argument value '{0}' is not valid for View", value));
 577                                 }
 578
 579                                 if (view != value) {
 580                                         h_scroll.Value = v_scroll.Value = 0;
 581                                         view = value;
 582                                         Redraw (true);
 583                                 }
 584                         }
 585                 }
 586                 #endregion      // Public Instance Properties
 587
 588                 #region Internal Methods Properties
 589
 590                 internal int FirstVisibleIndex {
 591                         get {
 592                                 // there is no item
 593                                 if (this.items.Count == 0)
 594                                         return 0;
 595
 596                                 if (h_marker == 0 && v_marker == 0)
 597                                         return 0;
 598
 599                                 foreach (ListViewItem item in this.items) {
 600                                         if (item.Bounds.Right >= 0 && item.Bounds.Bottom >= 0)
 601                                                 return item.Index;
 602                                 }
 603                                 return 0;
 604
 605                         }
 606                 }
 607
 608
 609                 internal int LastVisibleIndex {
 610                         get {
 611                                 for (int i = FirstVisibleIndex; i < Items.Count; i++) {
 612                                         if (View == View.List || Alignment == ListViewAlignment.Left) {
 613                                                 if (Items[i].Bounds.X > ClientRectangle.Right)
 614                                                         return i - 1;
 615                                         } else {
 616                                                 if (Items[i].Bounds.Y > ClientRectangle.Bottom)
 617                                                         return i - 1;
 618                                         }
 619                                 }
 620
 621                                 return Items.Count - 1;
 622                         }
 623                 }
 624
 625                 internal int TotalWidth {
 626                         get { return Math.Max (this.Width, this.layout_wd); }
 627                 }
 628
 629                 internal int TotalHeight {
 630                         get { return Math.Max (this.Height, this.layout_ht); }
 631                 }
 632
 633                 internal void Redraw (bool recalculate)
 634                 {
 635                         // Avoid calculations when control is being updated
 636                         if (this.updating)
 637                                 return;
 638
 639                         if (recalculate)
 640                                 CalculateListView (this.alignment);
 641
 642                         Refresh ();
 643                 }
 644
 645                 internal Size GetChildColumnSize (int index)
 646                 {
 647                         Size ret_size = Size.Empty;
 648                         ColumnHeader col = this.columns [index];
 649
 650                         if (col.Width == -2) { // autosize = max(items, columnheader)
 651                                 Size size = Size.Ceiling (this.DeviceContext.MeasureString
 652                                                           (col.Text, this.Font));
 653                                 ret_size = BiggestItem (index);
 654                                 if (size.Width > ret_size.Width)
 655                                         ret_size = size;
 656                         }
 657                         else { // -1 and all the values < -2 are put under one category
 658                                 ret_size = BiggestItem (index);
 659                                 // fall back to empty columns' width if no subitem is available for a column
 660                                 if (ret_size.IsEmpty) {
 661                                         ret_size.Width = ThemeEngine.Current.ListViewEmptyColumnWidth;
 662                                         if (col.Text.Length > 0)
 663                                                 ret_size.Height = Size.Ceiling (this.DeviceContext.MeasureString
 664                                                                                 (col.Text, this.Font)).Height;
 665                                         else
 666                                                 ret_size.Height = this.Font.Height;
 667                                 }
 668                         }
 669
 670                         // adjust the size for icon and checkbox for 0th column
 671                         if (index == 0) {
 672                                 ret_size.Width += (this.CheckBoxSize.Width + 4);
 673                                 if (this.small_image_list != null)
 674                                         ret_size.Width += this.small_image_list.ImageSize.Width;
 675                         }
 676                         return ret_size;
 677                 }
 678
 679                 // Returns the size of biggest item text in a column.
 680                 private Size BiggestItem (int col)
 681                 {
 682                         Size temp = Size.Empty;
 683                         Size ret_size = Size.Empty;
 684
 685                         // 0th column holds the item text, we check the size of
 686                         // the various subitems falling in that column and get
 687                         // the biggest one's size.
 688                         foreach (ListViewItem item in items) {
 689                                 if (col >= item.SubItems.Count)
 690                                         continue;
 691
 692                                 temp = Size.Ceiling (this.DeviceContext.MeasureString
 693                                                      (item.SubItems [col].Text, this.Font));
 694                                 if (temp.Width > ret_size.Width)
 695                                         ret_size = temp;
 696                         }
 697
 698                         // adjustment for space
 699                         if (!ret_size.IsEmpty)
 700                                 ret_size.Width += 4;
 701
 702                         return ret_size;
 703                 }
 704
 705                 // Sets the size of the biggest item text as per the view
 706                 private void CalcTextSize ()
 707                 {
 708                         // clear the old value
 709                         text_size = Size.Empty;
 710
 711                         if (items.Count == 0)
 712                                 return;
 713
 714                         text_size = BiggestItem (0);
 715
 716                         if (view == View.LargeIcon && this.label_wrap) {
 717                                 Size temp = Size.Empty;
 718                                 if (this.check_boxes)
 719                                         temp.Width += 2 * this.CheckBoxSize.Width;
 720                                 if (large_image_list != null)
 721                                         temp.Width += large_image_list.ImageSize.Width;
 722                                 if (temp.Width == 0)
 723                                         temp.Width = 43;
 724                                 // wrapping is done for two lines only
 725                                 if (text_size.Width > temp.Width) {
 726                                         text_size.Width = temp.Width;
 727                                         text_size.Height *= 2;
 728                                 }
 729                         }
 730                         else if (view == View.List) {
 731                                 // in list view max text shown in determined by the
 732                                 // control width, even if scolling is enabled.
 733                                 int max_wd = this.Width - (this.CheckBoxSize.Width - 2);
 734                                 if (this.small_image_list != null)
 735                                         max_wd -= this.small_image_list.ImageSize.Width;
 736
 737                                 if (text_size.Width > max_wd)
 738                                         text_size.Width = max_wd;
 739                         }
 740
 741                         // we do the default settings, if we have got 0's
 742                         if (text_size.Height <= 0)
 743                                 text_size.Height = this.Font.Height;
 744                         if (text_size.Width <= 0)
 745                                 text_size.Width = this.Width;
 746
 747                         // little adjustment
 748                         text_size.Width += 4;
 749                         text_size.Height += 2;
 750                 }
 751
 752                 private void Scroll (ScrollBar scrollbar, int delta)
 753                 {
 754                         if (delta == 0 || !scrollbar.Visible)
 755                                 return;
 756
 757                         int max;
 758                         if (scrollbar == h_scroll)
 759                                 max = h_scroll.Maximum - item_control.Width;
 760                         else
 761                                 max = v_scroll.Maximum - item_control.Height;
 762
 763                         int val = scrollbar.Value + delta;
 764                         if (val > max)
 765                                 val = max;
 766                         else if (val < scrollbar.Minimum)
 767                                 val = scrollbar.Minimum;
 768                         scrollbar.Value = val;
 769                 }
 770
 771                 private void CalculateScrollBars ()
 772                 {
 773                         Rectangle client_area = ClientRectangle;
 774
 775                         if (!this.scrollable || this.items.Count <= 0) {
 776                                 h_scroll.Visible = false;
 777                                 v_scroll.Visible = false;
 778                                 return;
 779                         }
 780
 781                         // making a scroll bar visible might make
 782                         // other scroll bar visible
 783                         if (layout_wd > client_area.Right) {
 784                                 h_scroll.Visible = true;
 785                                 if ((layout_ht + h_scroll.Height) > client_area.Bottom)
 786                                         v_scroll.Visible = true;
 787                                 else
 788                                         v_scroll.Visible = false;
 789                         } else if (layout_ht > client_area.Bottom) {
 790                                 v_scroll.Visible = true;
 791                                 if ((layout_wd + v_scroll.Width) > client_area.Right)
 792                                         h_scroll.Visible = true;
 793                                 else
 794                                         h_scroll.Visible = false;
 795                         } else {
 796                                 h_scroll.Visible = false;
 797                                 v_scroll.Visible = false;
 798                         }
 799
 800                         item_control.Height = ClientRectangle.Height - header_control.Height;
 801
 802                         if (h_scroll.Visible) {
 803                                 h_scroll.Location = new Point (client_area.X, client_area.Bottom - h_scroll.Height);
 804                                 h_scroll.Minimum = 0;
 805
 806                                 // if v_scroll is visible, adjust the maximum of the
 807                                 // h_scroll to account for the width of v_scroll
 808                                 if (v_scroll.Visible) {
 809                                         h_scroll.Maximum = layout_wd + v_scroll.Width;
 810                                         h_scroll.Width = client_area.Width - v_scroll.Width;
 811                                 }
 812                                 else {
 813                                         h_scroll.Maximum = layout_wd;
 814                                         h_scroll.Width = client_area.Width;
 815                                 }
 816
 817                                 h_scroll.LargeChange = client_area.Width;
 818                                 h_scroll.SmallChange = Font.Height;
 819                                 item_control.Height -= h_scroll.Height;
 820                         }
 821
 822                         if (header_control.Visible)
 823                                 header_control.Width = ClientRectangle.Width;
 824                         item_control.Width = ClientRectangle.Width;
 825
 826                         if (v_scroll.Visible) {
 827                                 v_scroll.Location = new Point (client_area.Right - v_scroll.Width, client_area.Y);
 828                                 v_scroll.Minimum = 0;
 829
 830                                 // if h_scroll is visible, adjust the maximum of the
 831                                 // v_scroll to account for the height of h_scroll
 832                                 if (h_scroll.Visible) {
 833                                         v_scroll.Maximum = layout_ht + h_scroll.Height;
 834                                         v_scroll.Height = client_area.Height; // - h_scroll.Height already done
 835                                 } else {
 836                                         v_scroll.Maximum = layout_ht;
 837                                         v_scroll.Height = client_area.Height;
 838                                 }
 839
 840                                 v_scroll.LargeChange = client_area.Height;
 841                                 v_scroll.SmallChange = Font.Height;
 842                                 if (header_control.Visible)
 843                                         header_control.Width -= v_scroll.Width;
 844                                 item_control.Width -= v_scroll.Width;
 845                         }
 846                 }
 847
 848                 ColumnHeader GetReorderedColumn (int index)
 849                 {
 850                         if (reordered_column_indices == null)
 851                                 return Columns [index];
 852                         else
 853                                 return Columns [reordered_column_indices [index]];
 854                 }
 855
 856                 void ReorderColumn (ColumnHeader col, int index)
 857                 {
 858                         if (reordered_column_indices == null) {
 859                                 reordered_column_indices = new int [Columns.Count];
 860                                 for (int i = 0; i < Columns.Count; i++)
 861                                         reordered_column_indices [i] = i;
 862                         }
 863
 864                         if (reordered_column_indices [index] == col.Index)
 865                                 return;
 866
 867                         int[] curr = reordered_column_indices;
 868                         int[] result = new int [Columns.Count];
 869                         int curr_idx = 0;
 870                         for (int i = 0; i < Columns.Count; i++) {
 871                                 if (curr_idx < Columns.Count && curr [curr_idx] == col.Index)
 872                                         curr_idx++;
 873
 874                                 if (i == index)
 875                                         result [i] = col.Index;
 876                                 else
 877                                         result [i] = curr [curr_idx++];
 878                         }
 879
 880                         reordered_column_indices = result;
 881                         LayoutDetails ();
 882                         header_control.Invalidate ();
 883                         item_control.Invalidate ();
 884                 }
 885
 886                 Size LargeIconItemSize {
 887                         get {
 888                                 int image_w = LargeImageList == null ? 12 : LargeImageList.ImageSize.Width;
 889                                 int image_h = LargeImageList == null ? 2 : LargeImageList.ImageSize.Height;
 890                                 int w = CheckBoxSize.Width + 2 + Math.Max (text_size.Width, image_w);
 891                                 int h = text_size.Height + 2 + Math.Max (CheckBoxSize.Height, image_h);
 892                                 return new Size (w, h);
 893                         }
 894                 }
 895
 896                 Size SmallIconItemSize {
 897                         get {
 898                                 int image_w = SmallImageList == null ? 0 : SmallImageList.ImageSize.Width;
 899                                 int image_h = SmallImageList == null ? 0 : SmallImageList.ImageSize.Height;
 900                                 int w = text_size.Width + 2 + CheckBoxSize.Width + image_w;
 901                                 int h = Math.Max (text_size.Height, Math.Max (CheckBoxSize.Height, image_h));
 902                                 return new Size (w, h);
 903                         }
 904                 }
 905
 906                 int rows;
 907                 int cols;
 908                 ListViewItem[,] item_matrix;
 909
 910                 void LayoutIcons (bool large_icons, bool left_aligned, int x_spacing, int y_spacing)
 911                 {
 912                         header_control.Visible = false;
 913                         header_control.Size = Size.Empty;
 914                         item_control.Visible = true;
 915                         item_control.Location = Point.Empty;
 916
 917                         if (items.Count == 0)
 918                                 return;
 919
 920                         Size sz = large_icons ? LargeIconItemSize : SmallIconItemSize;
 921
 922                         Rectangle area = ClientRectangle;
 923
 924                         if (left_aligned) {
 925                                 rows = (int) Math.Floor ((double)(area.Height - h_scroll.Height + y_spacing) / (double)(sz.Height + y_spacing));
 926                                 if (rows <= 0)
 927                                         rows = 1;
 928                                 cols = (int) Math.Ceiling ((double)items.Count / (double)rows);
 929                         } else {
 930                                 cols = (int) Math.Floor ((double)(area.Width - v_scroll.Width + x_spacing) / (double)(sz.Width + x_spacing));
 931                                 if (cols <= 0)
 932                                         cols = 1;
 933                                 rows = (int) Math.Ceiling ((double)items.Count / (double)cols);
 934                         }
 935
 936                         layout_ht = rows * (sz.Height + y_spacing) - y_spacing;
 937                         layout_wd = cols * (sz.Width + x_spacing) - x_spacing;
 938                         item_matrix = new ListViewItem [rows, cols];
 939                         int row = 0;
 940                         int col = 0;
 941                         foreach (ListViewItem item in items) {
 942                                 int x = col * (sz.Width + x_spacing);
 943                                 int y = row * (sz.Height + y_spacing);
 944                                 item.Location = new Point (x, y);
 945                                 item.Layout ();
 946                                 item.row = row;
 947                                 item.col = col;
 948                                 item_matrix [row, col] = item;
 949                                 if (left_aligned) {
 950                                         if (++row == rows) {
 951                                                 row = 0;
 952                                                 col++;
 953                                         }
 954                                 } else {
 955                                         if (++col == cols) {
 956                                                 col = 0;
 957                                                 row++;
 958                                         }
 959                                 }
 960                         }
 961
 962                         item_control.Size = new Size (layout_wd, layout_ht);
 963                 }
 964
 965                 void LayoutHeader ()
 966                 {
 967                         if (header_style == ColumnHeaderStyle.None) {
 968                                 header_control.Visible = false;
 969                                 header_control.Size = Size.Empty;
 970                                 return;
 971                         }
 972
 973                         int x = 0;
 974                         for (int i = 0; i < Columns.Count; i++) {
 975                                 ColumnHeader col = GetReorderedColumn (i);
 976                                 col.X = x;
 977                                 col.Y = 0;
 978                                 col.CalcColumnHeader ();
 979                                 x += col.Wd;
 980                         }
 981
 982                         if (x < ClientRectangle.Width)
 983                                 x = ClientRectangle.Width;
 984
 985                         header_control.Width = x;
 986                         header_control.Height = columns [0].Ht;
 987                         header_control.Visible = true;
 988                 }
 989
 990                 void LayoutDetails ()
 991                 {
 992                         if (columns.Count == 0) {
 993                                 header_control.Visible = false;
 994                                 item_control.Visible = false;
 995                                 return;
 996                         }
 997
 998                         LayoutHeader ();
 999
1000                         item_control.Visible = true;
1001                         item_control.Location = new Point (0, header_control.Height);
1002
1003                         int y = 0;
1004                         if (items.Count > 0) {
1005                                 foreach (ListViewItem item in items) {
1006                                         item.Layout ();
1007                                         item.Location = new Point (0, y);
1008                                         y += item.Bounds.Height + 2;
1009                                 }
1010
1011                                 // some space for bottom gridline
1012                                 if (grid_lines)
1013                                         y += 2;
1014                         }
1015
1016                         layout_wd = Math.Max (header_control.Width, item_control.Width);
1017                         layout_ht = y + header_control.Height;
1018                 }
1019
1020                 private void CalculateListView (ListViewAlignment align)
1021                 {
1022                         CalcTextSize ();
1023
1024                         switch (view) {
1025                         case View.Details:
1026                                 LayoutDetails ();
1027                                 break;
1028
1029                         case View.SmallIcon:
1030                                 LayoutIcons (false, alignment == ListViewAlignment.Left, 4, 2);
1031                                 break;
1032
1033                         case View.LargeIcon:
1034                                 LayoutIcons (true, alignment == ListViewAlignment.Left,
1035                                              ThemeEngine.Current.ListViewHorizontalSpacing,
1036                                              ThemeEngine.Current.ListViewVerticalSpacing);
1037                                 break;
1038
1039                         case View.List:
1040                                 LayoutIcons (false, true, 4, 2);
1041                                 break;
1042                         }
1043
1044                         CalculateScrollBars ();
1045                 }
1046
1047                 internal void UpdateSelection (ListViewItem item)
1048                 {
1049                         if (item.Selected) {
1050
1051                                 if (!CanMultiselect && SelectedItems.Count > 0) {
1052                                         SelectedItems.Clear ();
1053                                         SelectedIndices.list.Clear ();
1054                                 }
1055
1056                                 if (!SelectedItems.Contains (item)) {
1057                                         SelectedItems.list.Add (item);
1058                                         SelectedIndices.list.Add (item.Index);
1059                                 }
1060                         } else {
1061                                 SelectedItems.list.Remove (item);
1062                                 SelectedIndices.list.Remove (item.Index);
1063                         }
1064                 }
1065
1066                 private bool KeySearchString (KeyEventArgs ke)
1067                 {
1068                         int current_tickcnt = Environment.TickCount;
1069                         if (keysearch_tickcnt > 0 && current_tickcnt - keysearch_tickcnt > keysearch_keydelay) {
1070                                 keysearch_text = string.Empty;
1071                         }
1072
1073                         keysearch_text += (char) ke.KeyData;
1074                         keysearch_tickcnt = current_tickcnt;
1075
1076                         int start = FocusedItem == null ? 0 : FocusedItem.Index;
1077                         int i = start;
1078                         while (true) {
1079                                 if (CultureInfo.CurrentCulture.CompareInfo.IsPrefix (Items[i].Text, keysearch_text,
1080                                         CompareOptions.IgnoreCase)) {
1081                                         SetFocusedItem (Items [i]);
1082                                         items [i].Selected = true;
1083                                         EnsureVisible (i);
1084                                         break;
1085                                 }
1086                                 i = (i + 1  < Items.Count) ? i+1 : 0;
1087
1088                                 if (i == start)
1089                                         break;
1090                         }
1091                         return true;
1092                 }
1093
1094                 int GetAdjustedIndex (Keys key)
1095                 {
1096                         int result = -1;
1097
1098                         if (View == View.Details) {
1099                                 if (key == Keys.Up)
1100                                         result = FocusedItem.Index - 1;
1101                                 else if (key == Keys.Down) {
1102                                         result = FocusedItem.Index + 1;
1103                                         if (result == items.Count)
1104                                                 result = -1;
1105                                 }
1106                                 return result;
1107                         }
1108
1109                         int row = FocusedItem.row;
1110                         int col = FocusedItem.col;
1111
1112                         switch (key) {
1113                         case Keys.Left:
1114                                 if (col == 0)
1115                                         return -1;
1116                                 return item_matrix [row, col - 1].Index;
1117
1118                         case Keys.Right:
1119                                 if (col == (cols - 1))
1120                                         return -1;
1121                                 while (item_matrix [row, col + 1] == null)
1122                                        row--;
1123                                 return item_matrix [row, col + 1].Index;
1124
1125                         case Keys.Up:
1126                                 if (row == 0)
1127                                         return -1;
1128                                 return item_matrix [row - 1, col].Index;
1129
1130                         case Keys.Down:
1131                                 if (row == (rows - 1))
1132                                         return -1;
1133                                 while (item_matrix [row + 1, col] == null)
1134                                        col--;
1135                                 return item_matrix [row + 1, col].Index;
1136
1137                         default:
1138                                 return -1;
1139                         }
1140                 }
1141
1142                 ListViewItem selection_start;
1143
1144                 private bool SelectItems (ArrayList sel_items)
1145                 {
1146                         bool changed = false;
1147                         multiselecting = true;
1148                         ArrayList curr_items = (ArrayList) SelectedItems.list.Clone ();
1149                         foreach (ListViewItem item in curr_items)
1150                                 if (!sel_items.Contains (item)) {
1151                                         item.Selected = false;
1152                                         changed = true;
1153                                 }
1154                         foreach (ListViewItem item in sel_items)
1155                                 if (!item.Selected) {
1156                                         item.Selected = true;
1157                                         changed = true;
1158                                 }
1159                         multiselecting = false;
1160                         return changed;
1161                 }
1162
1163                 private void UpdateMultiSelection (int index)
1164                 {
1165                         bool shift_pressed = (XplatUI.State.ModifierKeys & Keys.Shift) != 0;
1166                         bool ctrl_pressed = (XplatUI.State.ModifierKeys & Keys.Control) != 0;
1167                         ListViewItem item = items [index];
1168
1169                         if (shift_pressed && selection_start != null) {
1170                                 ArrayList list = new ArrayList ();
1171                                 int start = Math.Min (selection_start.Index, index);
1172                                 int end = Math.Max (selection_start.Index, index);
1173                                 if (View == View.Details) {
1174                                         for (int i = start; i <= end; i++)
1175                                                 list.Add (items [i]);
1176                                 } else {
1177                                         int left = Math.Min (items [start].col, items [end].col);
1178                                         int right = Math.Max (items [start].col, items [end].col);
1179                                         int top = Math.Min (items [start].row, items [end].row);
1180                                         int bottom = Math.Max (items [start].row, items [end].row);
1181                                         foreach (ListViewItem curr in items)
1182                                                 if (curr.row >= top && curr.row <= bottom &&
1183                                                     curr.col >= left && curr.col <= right)
1184                                                         list.Add (curr);
1185                                 }
1186                                 if (SelectItems (list))
1187                                         OnSelectedIndexChanged (EventArgs.Empty);
1188                         } else if (!ctrl_pressed) {
1189                                 SelectedItems.Clear ();
1190                                 SelectedIndices.list.Clear ();
1191                                 item.Selected = true;
1192                                 selection_start = item;
1193                                 OnSelectedIndexChanged (EventArgs.Empty);
1194                         }
1195                 }
1196
1197                 private void ListView_KeyDown (object sender, KeyEventArgs ke)
1198                 {
1199                         if (ke.Handled || Items.Count == 0 || !item_control.Visible)
1200                                 return;
1201
1202                         int index = -1;
1203                         ke.Handled = true;
1204
1205                         switch (ke.KeyCode) {
1206
1207                         case Keys.End:
1208                                 index = Items.Count - 1;
1209                                 break;
1210
1211                         case Keys.Home:
1212                                 index = 0;
1213                                 break;
1214
1215                         case Keys.Left:
1216                         case Keys.Right:
1217                         case Keys.Up:
1218                         case Keys.Down:
1219                                 index = GetAdjustedIndex (ke.KeyCode);
1220                                 break;
1221
1222                         default:
1223                                 ke.Handled = KeySearchString (ke);
1224                                 return;
1225                         }
1226
1227                         if (index == -1)
1228                                 return;
1229
1230                         if (MultiSelect)
1231                                 UpdateMultiSelection (index);
1232                         else if (!items [index].Selected) {
1233                                 items [index].Selected = true;
1234                                 OnSelectedIndexChanged (EventArgs.Empty);
1235                         }
1236
1237                         SetFocusedItem (items [index]);
1238                         EnsureVisible (index);
1239                 }
1240
1241
1242                 internal class ItemControl : Control {
1243
1244                         ListView owner;
1245                         ListViewItem clicked_item;
1246                         ListViewItem last_clicked_item;
1247                         bool hover_processed = false;
1248
1249                         public ItemControl (ListView owner)
1250                         {
1251                                 this.owner = owner;
1252                                 DoubleClick += new EventHandler(ItemsDoubleClick);
1253                                 KeyDown += new KeyEventHandler (ItemsKeyDown);
1254                                 KeyUp += new KeyEventHandler (ItemsKeyUp);
1255                                 MouseDown += new MouseEventHandler(ItemsMouseDown);
1256                                 MouseMove += new MouseEventHandler(ItemsMouseMove);
1257                                 MouseHover += new EventHandler(ItemsMouseHover);
1258                                 MouseUp += new MouseEventHandler(ItemsMouseUp);
1259                                 MouseWheel += new MouseEventHandler(ItemsMouseWheel);
1260                                 GotFocus += new EventHandler (FocusChanged);
1261                                 LostFocus += new EventHandler (FocusChanged);
1262                         }
1263
1264                         void ItemsDoubleClick (object sender, EventArgs e)
1265                         {
1266                                 if (owner.activation == ItemActivation.Standard && owner.ItemActivate != null)
1267                                         owner.ItemActivate (this, e);
1268                         }
1269
1270                         void ItemsKeyDown (object sender, KeyEventArgs args)
1271                         {
1272                                 owner.OnKeyDown (args);
1273                         }
1274
1275                         void ItemsKeyUp (object sender, KeyEventArgs args)
1276                         {
1277                                 owner.OnKeyUp (args);
1278                         }
1279
1280                         enum BoxSelect {
1281                                 None,
1282                                 Normal,
1283                                 Shift,
1284                                 Control
1285                         }
1286
1287                         BoxSelect box_select_mode = BoxSelect.None;
1288                         ArrayList prev_selection;
1289                         Point box_select_start;
1290
1291                         Rectangle box_select_rect;
1292                         internal Rectangle BoxSelectRectangle {
1293                                 get { return box_select_rect; }
1294                                 set {
1295                                         if (box_select_rect == value)
1296                                                 return;
1297
1298                                         InvalidateBoxSelectRect ();
1299                                         box_select_rect = value;
1300                                         InvalidateBoxSelectRect ();
1301                                 }
1302                         }
1303
1304                         void InvalidateBoxSelectRect ()
1305                         {
1306                                 if (BoxSelectRectangle.Size.IsEmpty)
1307                                         return;
1308
1309                                 Rectangle edge = BoxSelectRectangle;
1310                                 edge.X -= 1;
1311                                 edge.Y -= 1;
1312                                 edge.Width += 2;
1313                                 edge.Height = 2;
1314                                 Invalidate (edge);
1315                                 edge.Y = BoxSelectRectangle.Bottom - 1;
1316                                 Invalidate (edge);
1317                                 edge.Y = BoxSelectRectangle.Y - 1;
1318                                 edge.Width = 2;
1319                                 edge.Height = BoxSelectRectangle.Height + 2;
1320                                 Invalidate (edge);
1321                                 edge.X = BoxSelectRectangle.Right - 1;
1322                                 Invalidate (edge);
1323                         }
1324
1325                         private Rectangle CalculateBoxSelectRectangle (Point pt)
1326                         {
1327                                 int left = Math.Min (box_select_start.X, pt.X);
1328                                 int right = Math.Max (box_select_start.X, pt.X);
1329                                 int top = Math.Min (box_select_start.Y, pt.Y);
1330                                 int bottom = Math.Max (box_select_start.Y, pt.Y);
1331                                 return Rectangle.FromLTRB (left, top, right, bottom);
1332                         }
1333
1334                         ArrayList BoxSelectedItems {
1335                                 get {
1336                                         ArrayList result = new ArrayList ();
1337                                         foreach (ListViewItem item in owner.Items) {
1338                                                 Rectangle r = item.Bounds;
1339                                                 r.X += r.Width / 4;
1340                                                 r.Y += r.Height / 4;
1341                                                 r.Width /= 2;
1342                                                 r.Height /= 2;
1343                                                 if (BoxSelectRectangle.IntersectsWith (r))
1344                                                         result.Add (item);
1345                                         }
1346                                         return result;
1347                                 }
1348                         }
1349
1350                         private bool PerformBoxSelection (Point pt)
1351                         {
1352                                 if (box_select_mode == BoxSelect.None)
1353                                         return false;
1354
1355                                 BoxSelectRectangle = CalculateBoxSelectRectangle (pt);
1356
1357                                 ArrayList box_items = BoxSelectedItems;
1358
1359                                 ArrayList items;
1360
1361                                 switch (box_select_mode) {
1362
1363                                 case BoxSelect.Normal:
1364                                         items = box_items;
1365                                         break;
1366
1367                                 case BoxSelect.Control:
1368                                         items = new ArrayList ();
1369                                         foreach (ListViewItem item in prev_selection)
1370                                                 if (!box_items.Contains (item))
1371                                                         items.Add (item);
1372                                         foreach (ListViewItem item in box_items)
1373                                                 if (!prev_selection.Contains (item))
1374                                                         items.Add (item);
1375                                         break;
1376
1377                                 case BoxSelect.Shift:
1378                                         items = box_items;
1379                                         foreach (ListViewItem item in box_items)
1380                                                 prev_selection.Remove (item);
1381                                         foreach (ListViewItem item in prev_selection)
1382                                                 items.Add (item);
1383                                         break;
1384
1385                                 default:
1386                                         throw new Exception ("Unexpected Selection mode: " + box_select_mode);
1387                                 }
1388
1389                                 SuspendLayout ();
1390                                 owner.SelectItems (items);
1391                                 ResumeLayout ();
1392
1393                                 return true;
1394                         }
1395
1396                         private void ItemsMouseDown (object sender, MouseEventArgs me)
1397                         {
1398                                 if (owner.items.Count == 0)
1399                                         return;
1400
1401                                 Point pt = new Point (me.X, me.Y);
1402                                 foreach (ListViewItem item in owner.items) {
1403                                         if (item.CheckRectReal.Contains (pt)) {
1404                                                 CheckState curr_state = item.Checked ?  CheckState.Checked : CheckState.Unchecked;
1405                                                 item.Checked = !item.Checked;
1406
1407                                                 CheckState new_state = item.Checked ?  CheckState.Checked : CheckState.Unchecked;
1408
1409                                                 // Raise the ItemCheck event
1410                                                 ItemCheckEventArgs ice = new ItemCheckEventArgs (item.Index, curr_state, new_state);
1411                                                 owner.OnItemCheck (ice);
1412                                                 break;
1413                                         }
1414
1415                                         if (owner.View == View.Details && !owner.FullRowSelect) {
1416                                                 if (item.GetBounds (ItemBoundsPortion.Label).Contains (pt)) {
1417                                                         clicked_item = item;
1418                                                         break;
1419                                                 }
1420                                         } else {
1421                                                 if (item.Bounds.Contains (pt)) {
1422                                                         clicked_item = item;
1423                                                         break;
1424                                                 }
1425                                         }
1426                                 }
1427
1428
1429                                 if (clicked_item != null) {
1430                                         owner.SetFocusedItem (clicked_item);
1431                                         bool changed = !clicked_item.Selected;
1432                                         if (owner.MultiSelect && (XplatUI.State.ModifierKeys & Keys.Control) == 0)
1433                                                 owner.UpdateMultiSelection (clicked_item.Index);
1434                                         else
1435                                                 clicked_item.Selected = true;
1436
1437                                         if (changed)
1438                                                 owner.OnSelectedIndexChanged (EventArgs.Empty);
1439
1440                                         // Raise double click if the item was clicked. On MS the
1441                                         // double click is only raised if you double click an item
1442                                         if (me.Clicks > 1 && clicked_item != null)
1443                                                 owner.OnDoubleClick (EventArgs.Empty);
1444                                         else if (me.Clicks == 1 && clicked_item != null)
1445                                                 owner.OnClick (EventArgs.Empty);
1446                                 } else {
1447                                         if (owner.MultiSelect) {
1448                                                 Keys mods = XplatUI.State.ModifierKeys;
1449                                                 if ((mods & Keys.Shift) != 0)
1450                                                         box_select_mode = BoxSelect.Shift;
1451                                                 else if ((mods & Keys.Control) != 0)
1452                                                         box_select_mode = BoxSelect.Control;
1453                                                 else
1454                                                         box_select_mode = BoxSelect.Normal;
1455                                                 box_select_start = pt;
1456                                                 prev_selection = (ArrayList) owner.SelectedItems.list.Clone ();
1457                                         } else if (owner.selected_indices.Count > 0) {
1458                                                 owner.SelectedItems.Clear ();
1459                                                 owner.SelectedIndices.list.Clear ();
1460                                                 owner.OnSelectedIndexChanged (EventArgs.Empty);
1461                                         }
1462                                 }
1463                         }
1464
1465                         private void ItemsMouseMove (object sender, MouseEventArgs me)
1466                         {
1467                                 if (PerformBoxSelection (new Point (me.X, me.Y)))
1468                                         return;
1469
1470                                 if (owner.HoverSelection && hover_processed) {
1471
1472                                         Point pt = PointToClient (Control.MousePosition);
1473                                         ListViewItem item = owner.GetItemAt (pt.X, pt.Y);
1474                                         if (item == null || item.Selected)
1475                                                 return;
1476
1477                                         hover_processed = false;
1478                                         XplatUI.ResetMouseHover (Handle);
1479                                 }
1480                         }
1481
1482
1483                         private void ItemsMouseHover (object sender, EventArgs e)
1484                         {
1485                                 if (Capture || !owner.HoverSelection)
1486                                         return;
1487
1488                                 hover_processed = true;
1489                                 Point pt = PointToClient (Control.MousePosition);
1490                                 ListViewItem item = owner.GetItemAt (pt.X, pt.Y);
1491
1492                                 if (item == null)
1493                                         return;
1494
1495                                 item.Selected = true;
1496                                 owner.OnSelectedIndexChanged (new EventArgs ());
1497                         }
1498
1499                         private void ItemsMouseUp (object sender, MouseEventArgs me)
1500                         {
1501                                 Capture = false;
1502                                 if (owner.Items.Count == 0)
1503                                         return;
1504
1505                                 Point pt = new Point (me.X, me.Y);
1506
1507                                 Rectangle rect = Rectangle.Empty;
1508                                 if (clicked_item != null) {
1509                                         if (owner.view == View.Details && !owner.full_row_select)
1510                                                 rect = clicked_item.GetBounds (ItemBoundsPortion.Label);
1511                                         else
1512                                                 rect = clicked_item.Bounds;
1513
1514                                         if (rect.Contains (pt)) {
1515                                                 switch (owner.activation) {
1516                                                 case ItemActivation.OneClick:
1517                                                         owner.OnItemActivate (EventArgs.Empty);
1518                                                         break;
1519
1520                                                 case ItemActivation.TwoClick:
1521                                                         if (last_clicked_item == clicked_item) {
1522                                                                 owner.OnItemActivate (EventArgs.Empty);
1523                                                                 last_clicked_item = null;
1524                                                         } else
1525                                                                 last_clicked_item = clicked_item;
1526                                                         break;
1527                                                 default:
1528                                                         // DoubleClick activation is handled in another handler
1529                                                         break;
1530                                                 }
1531                                         }
1532                                 } else if (owner.SelectedItems.Count > 0 && BoxSelectRectangle.Size.IsEmpty) {
1533                                         // Need this to clean up background clicks
1534                                         owner.SelectedItems.Clear ();
1535                                         owner.SelectedIndices.list.Clear ();
1536                                         owner.OnSelectedIndexChanged (EventArgs.Empty);
1537                                 }
1538
1539                                 clicked_item = null;
1540                                 box_select_start = Point.Empty;
1541                                 BoxSelectRectangle = Rectangle.Empty;
1542                                 prev_selection = null;
1543                                 box_select_mode = BoxSelect.None;
1544                         }
1545
1546                         private void ItemsMouseWheel (object sender, MouseEventArgs me)
1547                         {
1548                                 if (owner.Items.Count == 0)
1549                                         return;
1550
1551                                 int lines = me.Delta / 120;
1552
1553                                 if (lines == 0)
1554                                         return;
1555
1556                                 switch (owner.View) {
1557                                 case View.Details:
1558                                 case View.SmallIcon:
1559                                         owner.Scroll (owner.v_scroll, -owner.Items [0].Bounds.Height * SystemInformation.MouseWheelScrollLines * lines);
1560                                         break;
1561                                 case View.LargeIcon:
1562                                         owner.Scroll (owner.v_scroll, -(owner.Items [0].Bounds.Height + ThemeEngine.Current.ListViewVerticalSpacing)  * lines);
1563                                         break;
1564                                 case View.List:
1565                                         owner.Scroll (owner.h_scroll, -owner.Items [0].Bounds.Width * lines);
1566                                         break;
1567                                 }
1568                         }
1569
1570                         void FocusChanged (object o, EventArgs args)
1571                         {
1572                                 if (owner.Items.Count == 0)
1573                                         return;
1574
1575                                 if (owner.FocusedItem == null)
1576                                         owner.SetFocusedItem (owner.Items [0]);
1577
1578                                 Invalidate (owner.FocusedItem.Bounds);
1579                         }
1580
1581                         internal override void OnPaintInternal (PaintEventArgs pe)
1582                         {
1583                                 ThemeEngine.Current.DrawListViewItems (pe.Graphics, pe.ClipRectangle, owner);
1584                         }
1585                 }
1586
1587                 internal override void OnPaintInternal (PaintEventArgs pe)
1588                 {
1589                         if (updating)
1590                                 return;
1591
1592                         CalculateScrollBars ();
1593                 }
1594
1595                 private void ListView_SizeChanged (object sender, EventArgs e)
1596                 {
1597                         CalculateListView (alignment);
1598                 }
1599
1600                 private void SetFocusedItem (ListViewItem item)
1601                 {
1602                         if (focused_item != null)
1603                                 focused_item.Focused = false;
1604
1605                         if (item != null)
1606                                 item.Focused = true;
1607
1608                         focused_item = item;
1609                 }
1610
1611                 private void HorizontalScroller (object sender, EventArgs e)
1612                 {
1613                         // Avoid unnecessary flickering, when button is
1614                         // kept pressed at the end
1615                         if (h_marker != h_scroll.Value) {
1616
1617                                 int pixels =  h_marker - h_scroll.Value;
1618
1619                                 h_marker = h_scroll.Value;
1620                                 if (header_control.Visible)
1621                                         XplatUI.ScrollWindow (header_control.Handle, pixels, 0, false);
1622
1623                                 XplatUI.ScrollWindow (item_control.Handle, pixels, 0, false);
1624                         }
1625                 }
1626
1627                 private void VerticalScroller (object sender, EventArgs e)
1628                 {
1629                         // Avoid unnecessary flickering, when button is
1630                         // kept pressed at the end
1631                         if (v_marker != v_scroll.Value) {
1632                                 int pixels =  v_marker - v_scroll.Value;
1633                                 Rectangle area = item_control.ClientRectangle;
1634                                 v_marker = v_scroll.Value;
1635                                 XplatUI.ScrollWindow (item_control.Handle, area, 0, pixels, false);
1636                         }
1637                 }
1638                 #endregion      // Internal Methods Properties
1639
1640                 #region Protected Methods
1641                 protected override void CreateHandle ()
1642                 {
1643                         base.CreateHandle ();
1644                 }
1645
1646                 protected override void Dispose (bool disposing)
1647                 {
1648                         if (disposing) {
1649                                 h_scroll.Dispose ();
1650                                 v_scroll.Dispose ();
1651
1652                                 large_image_list = null;
1653                                 small_image_list = null;
1654                                 state_image_list = null;
1655                         }
1656
1657                         base.Dispose (disposing);
1658                 }
1659
1660                 protected override bool IsInputKey (Keys keyData)
1661                 {
1662                         switch (keyData) {
1663                         case Keys.Up:
1664                         case Keys.Down:
1665                         case Keys.PageUp:
1666                         case Keys.PageDown:
1667                         case Keys.Right:
1668                         case Keys.Left:
1669                         case Keys.End:
1670                         case Keys.Home:
1671                                 return true;
1672
1673                         default:
1674                                 break;
1675                         }
1676
1677                         return base.IsInputKey (keyData);
1678                 }
1679
1680                 protected virtual void OnAfterLabelEdit (LabelEditEventArgs e)
1681                 {
1682                         if (AfterLabelEdit != null)
1683                                 AfterLabelEdit (this, e);
1684                 }
1685
1686                 protected virtual void OnBeforeLabelEdit (LabelEditEventArgs e)
1687                 {
1688                         if (BeforeLabelEdit != null)
1689                                 BeforeLabelEdit (this, e);
1690                 }
1691
1692                 protected virtual void OnColumnClick (ColumnClickEventArgs e)
1693                 {
1694                         if (ColumnClick != null)
1695                                 ColumnClick (this, e);
1696                 }
1697
1698                 protected override void OnEnabledChanged (EventArgs e)
1699                 {
1700                         base.OnEnabledChanged (e);
1701                 }
1702
1703                 protected override void OnFontChanged (EventArgs e)
1704                 {
1705                         base.OnFontChanged (e);
1706                         Redraw (true);
1707                 }
1708
1709                 protected override void OnHandleCreated (EventArgs e)
1710                 {
1711                         base.OnHandleCreated (e);
1712                 }
1713
1714                 protected override void OnHandleDestroyed (EventArgs e)
1715                 {
1716                         base.OnHandleDestroyed (e);
1717                 }
1718
1719                 protected virtual void OnItemActivate (EventArgs e)
1720                 {
1721                         if (ItemActivate != null)
1722                                 ItemActivate (this, e);
1723                 }
1724
1725                 protected virtual void OnItemCheck (ItemCheckEventArgs ice)
1726                 {
1727                         if (ItemCheck != null)
1728                                 ItemCheck (this, ice);
1729                 }
1730
1731                 protected virtual void OnItemDrag (ItemDragEventArgs e)
1732                 {
1733                         if (ItemDrag != null)
1734                                 ItemDrag (this, e);
1735                 }
1736
1737                 protected virtual void OnSelectedIndexChanged (EventArgs e)
1738                 {
1739                         if (SelectedIndexChanged != null)
1740                                 SelectedIndexChanged (this, e);
1741                 }
1742
1743                 protected override void OnSystemColorsChanged (EventArgs e)
1744                 {
1745                         base.OnSystemColorsChanged (e);
1746                 }
1747
1748                 protected void RealizeProperties ()
1749                 {
1750                         // FIXME: TODO
1751                 }
1752
1753                 protected void UpdateExtendedStyles ()
1754                 {
1755                         // FIXME: TODO
1756                 }
1757
1758                 protected override void WndProc (ref Message m)
1759                 {
1760                         base.WndProc (ref m);
1761                 }
1762                 #endregion // Protected Methods
1763
1764                 #region Public Instance Methods
1765                 public void ArrangeIcons ()
1766                 {
1767                         ArrangeIcons (this.alignment);
1768                 }
1769
1770                 public void ArrangeIcons (ListViewAlignment alignment)
1771                 {
1772                         // Icons are arranged only if view is set to LargeIcon or SmallIcon
1773                         if (view == View.LargeIcon || view == View.SmallIcon) {
1774                                 this.CalculateListView (alignment);
1775                                 // we have done the calculations already
1776                                 this.Redraw (false);
1777                         }
1778                 }
1779
1780                 public void BeginUpdate ()
1781                 {
1782                         // flag to avoid painting
1783                         updating = true;
1784                 }
1785
1786                 public void Clear ()
1787                 {
1788                         columns.Clear ();
1789                         items.Clear (); // Redraw (true) called here
1790                 }
1791
1792                 public void EndUpdate ()
1793                 {
1794                         // flag to avoid painting
1795                         updating = false;
1796
1797                         // probably, now we need a redraw with recalculations
1798                         this.Redraw (true);
1799                 }
1800
1801                 public void EnsureVisible (int index)
1802                 {
1803                         if (index < 0 || index >= items.Count || scrollable == false)
1804                                 return;
1805
1806                         Rectangle view_rect = item_control.ClientRectangle;
1807                         Rectangle bounds = items [index].Bounds;
1808
1809                         if (view_rect.Contains (bounds))
1810                                 return;
1811
1812                         if (bounds.Left < 0)
1813                                 h_scroll.Value += bounds.Left;
1814                         else if (bounds.Right > view_rect.Right)
1815                                 h_scroll.Value += (bounds.Right - view_rect.Right);
1816
1817                         if (bounds.Top < 0)
1818                                 v_scroll.Value += bounds.Top;
1819                         else if (bounds.Bottom > view_rect.Bottom)
1820                                 v_scroll.Value += (bounds.Bottom - view_rect.Bottom);
1821                 }
1822
1823                 public ListViewItem GetItemAt (int x, int y)
1824                 {
1825                         foreach (ListViewItem item in items) {
1826                                 if (item.Bounds.Contains (x, y))
1827                                         return item;
1828                         }
1829                         return null;
1830                 }
1831
1832                 public Rectangle GetItemRect (int index)
1833                 {
1834                         return GetItemRect (index, ItemBoundsPortion.Entire);
1835                 }
1836
1837                 public Rectangle GetItemRect (int index, ItemBoundsPortion portion)
1838                 {
1839                         if (index < 0 || index >= items.Count)
1840                                 throw new IndexOutOfRangeException ("index");
1841
1842                         return items [index].GetBounds (portion);
1843                 }
1844
1845                 public void Sort ()
1846                 {
1847                         if (sort_order != SortOrder.None)
1848                                 items.list.Sort (item_sorter);
1849
1850                         if (sort_order == SortOrder.Descending)
1851                                 items.list.Reverse ();
1852
1853                         this.Redraw (true);
1854                 }
1855
1856                 public override string ToString ()
1857                 {
1858                         int count = this.Items.Count;
1859
1860                         if (count == 0)
1861                                 return string.Format ("System.Windows.Forms.ListView, Items.Count: 0");
1862                         else
1863                                 return string.Format ("System.Windows.Forms.ListView, Items.Count: {0}, Items[0]: {1}", count, this.Items [0].ToString ());
1864                 }
1865                 #endregion      // Public Instance Methods
1866
1867
1868                 #region Subclasses
1869
1870                 class HeaderControl : Control {
1871
1872                         ListView owner;
1873                         bool column_resize_active = false;
1874                         ColumnHeader resize_column;
1875                         ColumnHeader clicked_column;
1876                         ColumnHeader drag_column;
1877                         int drag_x;
1878                         int drag_to_index = -1;
1879
1880                         public HeaderControl (ListView owner)
1881                         {
1882                                 this.owner = owner;
1883                                 MouseDown += new MouseEventHandler (HeaderMouseDown);
1884                                 MouseMove += new MouseEventHandler (HeaderMouseMove);
1885                                 MouseUp += new MouseEventHandler (HeaderMouseUp);
1886                         }
1887
1888                         private ColumnHeader ColumnAtX (int x)
1889                         {
1890                                 Point pt = new Point (x, 0);
1891                                 ColumnHeader result = null;
1892                                 foreach (ColumnHeader col in owner.Columns) {
1893                                         if (col.Rect.Contains (pt)) {
1894                                                 result = col;
1895                                                 break;
1896                                         }
1897                                 }
1898                                 return result;
1899                         }
1900
1901                         private int GetReorderedIndex (ColumnHeader col)
1902                         {
1903                                 if (owner.reordered_column_indices == null)
1904                                         return col.Index;
1905                                 else
1906                                         for (int i = 0; i < owner.Columns.Count; i++)
1907                                                 if (owner.reordered_column_indices [i] == col.Index)
1908                                                         return i;
1909                                 throw new Exception ("Column index missing from reordered array");
1910                         }
1911
1912                         private void HeaderMouseDown (object sender, MouseEventArgs me)
1913                         {
1914                                 if (resize_column != null) {
1915                                         column_resize_active = true;
1916                                         Capture = true;
1917                                         return;
1918                                 }
1919
1920                                 clicked_column = ColumnAtX (me.X + owner.h_marker);
1921
1922                                 if (clicked_column != null) {
1923                                         Capture = true;
1924                                         if (owner.AllowColumnReorder) {
1925                                                 drag_x = me.X;
1926                                                 drag_column = (ColumnHeader) (clicked_column as ICloneable).Clone ();
1927                                                 drag_column.column_rect = clicked_column.Rect;
1928                                                 drag_to_index = GetReorderedIndex (clicked_column);
1929                                         }
1930                                         clicked_column.pressed = true;
1931                                         Rectangle bounds = clicked_column.Rect;
1932                                         bounds.X -= owner.h_marker;
1933                                         Invalidate (bounds);
1934                                         return;
1935                                 }
1936                         }
1937
1938                         private void HeaderMouseMove (object sender, MouseEventArgs me)
1939                         {
1940                                 Point pt = new Point (me.X + owner.h_marker, me.Y);
1941
1942                                 if (column_resize_active)  {
1943                                         resize_column.Width = pt.X - resize_column.X;
1944                                         if (resize_column.Width < 0)
1945                                                 resize_column.Width = 0;
1946                                         return;
1947                                 }
1948
1949                                 resize_column = null;
1950
1951                                 if (clicked_column != null) {
1952                                         if (owner.AllowColumnReorder) {
1953                                                 Rectangle r;
1954
1955                                                 r = drag_column.column_rect;
1956                                                 r.X = clicked_column.Rect.X + me.X - drag_x;
1957                                                 drag_column.column_rect = r;
1958
1959                                                 int x = me.X + owner.h_marker;
1960                                                 ColumnHeader over = ColumnAtX (x);
1961                                                 if (over == null)
1962                                                         drag_to_index = owner.Columns.Count;
1963                                                 else if (x < over.X + over.Width / 2)
1964                                                         drag_to_index = GetReorderedIndex (over);
1965                                                 else
1966                                                         drag_to_index = GetReorderedIndex (over) + 1;
1967                                                 Invalidate ();
1968                                         } else {
1969                                                 ColumnHeader over = ColumnAtX (me.X + owner.h_marker);
1970                                                 bool pressed = clicked_column.pressed;
1971                                                 clicked_column.pressed = over == clicked_column;
1972                                                 if (clicked_column.pressed ^ pressed) {
1973                                                         Rectangle bounds = clicked_column.Rect;
1974                                                         bounds.X -= owner.h_marker;
1975                                                         Invalidate (bounds);
1976                                                 }
1977                                         }
1978                                         return;
1979                                 }
1980
1981                                 for (int i = 0; i < owner.Columns.Count; i++) {
1982                                         Rectangle zone = owner.Columns [i].Rect;
1983                                         zone.X = zone.Right - 5;
1984                                         zone.Width = 10;
1985                                         if (zone.Contains (pt)) {
1986                                                 resize_column = owner.Columns [i];
1987                                                 break;
1988                                         }
1989                                 }
1990
1991                                 if (resize_column == null)
1992                                         Cursor = Cursors.Default;
1993                                 else
1994                                         Cursor = Cursors.VSplit;
1995                         }
1996
1997                         void HeaderMouseUp (object sender, MouseEventArgs me)
1998                         {
1999                                 Capture = false;
2000
2001                                 if (column_resize_active) {
2002                                         column_resize_active = false;
2003                                         resize_column = null;
2004                                         Cursor = Cursors.Default;
2005                                         return;
2006                                 }
2007
2008                                 if (clicked_column != null && clicked_column.pressed) {
2009                                         clicked_column.pressed = false;
2010                                         Rectangle bounds = clicked_column.Rect;
2011                                         bounds.X -= owner.h_marker;
2012                                         Invalidate (bounds);
2013                                         owner.OnColumnClick (new ColumnClickEventArgs (clicked_column.Index));
2014                                 }
2015
2016                                 if (drag_column != null && owner.AllowColumnReorder) {
2017                                         drag_column = null;
2018                                         if (drag_to_index > GetReorderedIndex (clicked_column))
2019                                                 drag_to_index--;
2020                                         if (owner.GetReorderedColumn (drag_to_index) != clicked_column)
2021                                                 owner.ReorderColumn (clicked_column, drag_to_index);
2022                                         drag_to_index = -1;
2023                                         Invalidate ();
2024                                 }
2025
2026                                 clicked_column = null;
2027                         }
2028
2029                         internal override void OnPaintInternal (PaintEventArgs pe)
2030                         {
2031                                 if (owner.updating)
2032                                         return;
2033
2034                                 Theme theme = ThemeEngine.Current;
2035                                 theme.DrawListViewHeader (pe.Graphics, pe.ClipRectangle, this.owner);
2036
2037                                 if (drag_column == null)
2038                                         return;
2039
2040                                 int target_x;
2041                                 if (drag_to_index == owner.Columns.Count)
2042                                         target_x = owner.GetReorderedColumn (drag_to_index - 1).Rect.Right - owner.h_marker;
2043                                 else
2044                                         target_x = owner.GetReorderedColumn (drag_to_index).Rect.X - owner.h_marker;
2045                                 theme.DrawListViewHeaderDragDetails (pe.Graphics, owner, drag_column, target_x);
2046                         }
2047                 }
2048
2049                 public class CheckedIndexCollection : IList, ICollection, IEnumerable
2050                 {
2051                         internal ArrayList list;
2052                         private ListView owner;
2053
2054                         #region Public Constructor
2055                         public CheckedIndexCollection (ListView owner)
2056                         {
2057                                 list = new ArrayList ();
2058                                 this.owner = owner;
2059                         }
2060                         #endregion      // Public Constructor
2061
2062                         #region Public Properties
2063                         [Browsable (false)]
2064                         public int Count {
2065                                 get { return list.Count; }
2066                         }
2067
2068                         public bool IsReadOnly {
2069                                 get { return true; }
2070                         }
2071
2072                         public int this [int index] {
2073                                 get {
2074                                         if (index < 0 || index >= list.Count)
2075                                                 throw new ArgumentOutOfRangeException ("index");
2076                                         return (int) list [index];
2077                                 }
2078                         }
2079
2080                         bool ICollection.IsSynchronized {
2081                                 get { return false; }
2082                         }
2083
2084                         object ICollection.SyncRoot {
2085                                 get { return this; }
2086                         }
2087
2088                         bool IList.IsFixedSize {
2089                                 get { return true; }
2090                         }
2091
2092                         object IList.this [int index] {
2093                                 get { return this [index]; }
2094                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2095                         }
2096                         #endregion      // Public Properties
2097
2098                         #region Public Methods
2099                         public bool Contains (int checkedIndex)
2100                         {
2101                                 return list.Contains (checkedIndex);
2102                         }
2103
2104                         public IEnumerator GetEnumerator ()
2105                         {
2106                                 return list.GetEnumerator ();
2107                         }
2108
2109                         void ICollection.CopyTo (Array dest, int index)
2110                         {
2111                                 list.CopyTo (dest, index);
2112                         }
2113
2114                         int IList.Add (object value)
2115                         {
2116                                 throw new NotSupportedException ("Add operation is not supported.");
2117                         }
2118
2119                         void IList.Clear ()
2120                         {
2121                                 throw new NotSupportedException ("Clear operation is not supported.");
2122                         }
2123
2124                         bool IList.Contains (object checkedIndex)
2125                         {
2126                                 return list.Contains (checkedIndex);
2127                         }
2128
2129                         int IList.IndexOf (object checkedIndex)
2130                         {
2131                                 return list.IndexOf (checkedIndex);
2132                         }
2133
2134                         void IList.Insert (int index, object value)
2135                         {
2136                                 throw new NotSupportedException ("Insert operation is not supported.");
2137                         }
2138
2139                         void IList.Remove (object value)
2140                         {
2141                                 throw new NotSupportedException ("Remove operation is not supported.");
2142                         }
2143
2144                         void IList.RemoveAt (int index)
2145                         {
2146                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2147                         }
2148
2149                         public int IndexOf (int checkedIndex)
2150                         {
2151                                 return list.IndexOf (checkedIndex);
2152                         }
2153                         #endregion      // Public Methods
2154
2155                 }       // CheckedIndexCollection
2156
2157                 public class CheckedListViewItemCollection : IList, ICollection, IEnumerable
2158                 {
2159                         internal ArrayList list;
2160                         private ListView owner;
2161
2162                         #region Public Constructor
2163                         public CheckedListViewItemCollection (ListView owner)
2164                         {
2165                                 list = new ArrayList ();
2166                                 this.owner = owner;
2167                         }
2168                         #endregion      // Public Constructor
2169
2170                         #region Public Properties
2171                         [Browsable (false)]
2172                         public int Count {
2173                                 get { return list.Count; }
2174                         }
2175
2176                         public bool IsReadOnly {
2177                                 get { return true; }
2178                         }
2179
2180                         public ListViewItem this [int index] {
2181                                 get {
2182                                         if (index < 0 || index >= list.Count)
2183                                                 throw new ArgumentOutOfRangeException ("index");
2184                                         return (ListViewItem) list [index];
2185                                 }
2186                         }
2187
2188                         bool ICollection.IsSynchronized {
2189                                 get { return list.IsSynchronized; }
2190                         }
2191
2192                         object ICollection.SyncRoot {
2193                                 get { return this; }
2194                         }
2195
2196                         bool IList.IsFixedSize {
2197                                 get { return true; }
2198                         }
2199
2200                         object IList.this [int index] {
2201                                 get { return this [index]; }
2202                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2203                         }
2204                         #endregion      // Public Properties
2205
2206                         #region Public Methods
2207                         public bool Contains (ListViewItem item)
2208                         {
2209                                 return list.Contains (item);
2210                         }
2211
2212                         public void CopyTo (Array dest, int index)
2213                         {
2214                                 list.CopyTo (dest, index);
2215                         }
2216
2217                         public IEnumerator GetEnumerator ()
2218                         {
2219                                 return list.GetEnumerator ();
2220                         }
2221
2222                         int IList.Add (object value)
2223                         {
2224                                 throw new NotSupportedException ("Add operation is not supported.");
2225                         }
2226
2227                         void IList.Clear ()
2228                         {
2229                                 throw new NotSupportedException ("Clear operation is not supported.");
2230                         }
2231
2232                         bool IList.Contains (object item)
2233                         {
2234                                 return list.Contains (item);
2235                         }
2236
2237                         int IList.IndexOf (object item)
2238                         {
2239                                 return list.IndexOf (item);
2240                         }
2241
2242                         void IList.Insert (int index, object value)
2243                         {
2244                                 throw new NotSupportedException ("Insert operation is not supported.");
2245                         }
2246
2247                         void IList.Remove (object value)
2248                         {
2249                                 throw new NotSupportedException ("Remove operation is not supported.");
2250                         }
2251
2252                         void IList.RemoveAt (int index)
2253                         {
2254                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2255                         }
2256
2257                         public int IndexOf (ListViewItem item)
2258                         {
2259                                 return list.IndexOf (item);
2260                         }
2261                         #endregion      // Public Methods
2262
2263                 }       // CheckedListViewItemCollection
2264
2265                 public class ColumnHeaderCollection : IList, ICollection, IEnumerable
2266                 {
2267                         internal ArrayList list;
2268                         private ListView owner;
2269
2270                         #region Public Constructor
2271                         public ColumnHeaderCollection (ListView owner)
2272                         {
2273                                 list = new ArrayList ();
2274                                 this.owner = owner;
2275                         }
2276                         #endregion      // Public Constructor
2277
2278                         #region Public Properties
2279                         [Browsable (false)]
2280                         public int Count {
2281                                 get { return list.Count; }
2282                         }
2283
2284                         public bool IsReadOnly {
2285                                 get { return false; }
2286                         }
2287
2288                         public virtual ColumnHeader this [int index] {
2289                                 get {
2290                                         if (index < 0 || index >= list.Count)
2291                                                 throw new ArgumentOutOfRangeException ("index");
2292                                         return (ColumnHeader) list [index];
2293                                 }
2294                         }
2295
2296                         bool ICollection.IsSynchronized {
2297                                 get { return true; }
2298                         }
2299
2300                         object ICollection.SyncRoot {
2301                                 get { return this; }
2302                         }
2303
2304                         bool IList.IsFixedSize {
2305                                 get { return list.IsFixedSize; }
2306                         }
2307
2308                         object IList.this [int index] {
2309                                 get { return this [index]; }
2310                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2311                         }
2312                         #endregion      // Public Properties
2313
2314                         #region Public Methods
2315                         public virtual int Add (ColumnHeader value)
2316                         {
2317                                 int idx;
2318                                 value.owner = this.owner;
2319                                 idx = list.Add (value);
2320                                 if (owner.IsHandleCreated) {
2321                                         owner.Redraw (true);
2322                                 }
2323                                 return idx;
2324                         }
2325
2326                         public virtual ColumnHeader Add (string str, int width, HorizontalAlignment textAlign)
2327                         {
2328                                 ColumnHeader colHeader = new ColumnHeader (this.owner, str, textAlign, width);
2329                                 this.Add (colHeader);
2330                                 return colHeader;
2331                         }
2332
2333                         public virtual void AddRange (ColumnHeader [] values)
2334                         {
2335                                 foreach (ColumnHeader colHeader in values) {
2336                                         colHeader.owner = this.owner;
2337                                         Add (colHeader);
2338                                 }
2339
2340                                 owner.Redraw (true);
2341                         }
2342
2343                         public virtual void Clear ()
2344                         {
2345                                 list.Clear ();
2346                                 owner.Redraw (true);
2347                         }
2348
2349                         public bool Contains (ColumnHeader value)
2350                         {
2351                                 return list.Contains (value);
2352                         }
2353
2354                         public IEnumerator GetEnumerator ()
2355                         {
2356                                 return list.GetEnumerator ();
2357                         }
2358
2359                         void ICollection.CopyTo (Array dest, int index)
2360                         {
2361                                 list.CopyTo (dest, index);
2362                         }
2363
2364                         int IList.Add (object value)
2365                         {
2366                                 if (! (value is ColumnHeader)) {
2367                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2368                                 }
2369
2370                                 return this.Add ((ColumnHeader) value);
2371                         }
2372
2373                         bool IList.Contains (object value)
2374                         {
2375                                 if (! (value is ColumnHeader)) {
2376                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2377                                 }
2378
2379                                 return this.Contains ((ColumnHeader) value);
2380                         }
2381
2382                         int IList.IndexOf (object value)
2383                         {
2384                                 if (! (value is ColumnHeader)) {
2385                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2386                                 }
2387
2388                                 return this.IndexOf ((ColumnHeader) value);
2389                         }
2390
2391                         void IList.Insert (int index, object value)
2392                         {
2393                                 if (! (value is ColumnHeader)) {
2394                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2395                                 }
2396
2397                                 this.Insert (index, (ColumnHeader) value);
2398                         }
2399
2400                         void IList.Remove (object value)
2401                         {
2402                                 if (! (value is ColumnHeader)) {
2403                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2404                                 }
2405
2406                                 this.Remove ((ColumnHeader) value);
2407                         }
2408
2409                         public int IndexOf (ColumnHeader value)
2410                         {
2411                                 return list.IndexOf (value);
2412                         }
2413
2414                         public void Insert (int index, ColumnHeader value)
2415                         {
2416                                 // LAMESPEC: MSDOCS say greater than or equal to the value of the Count property
2417                                 // but it's really only greater.
2418                                 if (index < 0 || index > list.Count)
2419                                         throw new ArgumentOutOfRangeException ("index");
2420
2421                                 value.owner = this.owner;
2422                                 list.Insert (index, value);
2423                                 owner.Redraw (true);
2424                         }
2425
2426                         public void Insert (int index, string str, int width, HorizontalAlignment textAlign)
2427                         {
2428                                 ColumnHeader colHeader = new ColumnHeader (this.owner, str, textAlign, width);
2429                                 this.Insert (index, colHeader);
2430                         }
2431
2432                         public virtual void Remove (ColumnHeader column)
2433                         {
2434                                 // TODO: Update Column internal index ?
2435                                 list.Remove (column);
2436                                 owner.Redraw (true);
2437                         }
2438
2439                         public virtual void RemoveAt (int index)
2440                         {
2441                                 if (index < 0 || index >= list.Count)
2442                                         throw new ArgumentOutOfRangeException ("index");
2443
2444                                 // TODO: Update Column internal index ?
2445                                 list.RemoveAt (index);
2446                                 owner.Redraw (true);
2447                         }
2448                         #endregion      // Public Methods
2449
2450
2451                 }       // ColumnHeaderCollection
2452
2453                 public class ListViewItemCollection : IList, ICollection, IEnumerable
2454                 {
2455                         internal ArrayList list;
2456                         private ListView owner;
2457
2458                         #region Public Constructor
2459                         public ListViewItemCollection (ListView owner)
2460                         {
2461                                 list = new ArrayList ();
2462                                 this.owner = owner;
2463                         }
2464                         #endregion      // Public Constructor
2465
2466                         #region Public Properties
2467                         [Browsable (false)]
2468                         public int Count {
2469                                 get { return list.Count; }
2470                         }
2471
2472                         public bool IsReadOnly {
2473                                 get { return false; }
2474                         }
2475
2476                         public virtual ListViewItem this [int displayIndex] {
2477                                 get {
2478                                         if (displayIndex < 0 || displayIndex >= list.Count)
2479                                                 throw new ArgumentOutOfRangeException ("displayIndex");
2480                                         return (ListViewItem) list [displayIndex];
2481                                 }
2482
2483                                 set {
2484                                         if (displayIndex < 0 || displayIndex >= list.Count)
2485                                                 throw new ArgumentOutOfRangeException ("displayIndex");
2486
2487                                         if (list.Contains (value))
2488                                                 throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "value");
2489
2490                                         value.Owner = owner;
2491                                         list [displayIndex] = value;
2492
2493                                         owner.Redraw (true);
2494                                 }
2495                         }
2496
2497                         bool ICollection.IsSynchronized {
2498                                 get { return true; }
2499                         }
2500
2501                         object ICollection.SyncRoot {
2502                                 get { return this; }
2503                         }
2504
2505                         bool IList.IsFixedSize {
2506                                 get { return list.IsFixedSize; }
2507                         }
2508
2509                         object IList.this [int index] {
2510                                 get { return this [index]; }
2511                                 set {
2512                                         if (value is ListViewItem)
2513                                                 this [index] = (ListViewItem) value;
2514                                         else
2515                                                 this [index] = new ListViewItem (value.ToString ());
2516                                 }
2517                         }
2518                         #endregion      // Public Properties
2519
2520                         #region Public Methods
2521                         public virtual ListViewItem Add (ListViewItem value)
2522                         {
2523                                 if (list.Contains (value))
2524                                         throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "value");
2525
2526                                 value.Owner = owner;
2527                                 list.Add (value);
2528
2529                                 if (owner.Sorting != SortOrder.None)
2530                                         owner.Sort ();
2531
2532                                 owner.Redraw (true);
2533
2534                                 return value;
2535                         }
2536
2537                         public virtual ListViewItem Add (string text)
2538                         {
2539                                 ListViewItem item = new ListViewItem (text);
2540                                 return this.Add (item);
2541                         }
2542
2543                         public virtual ListViewItem Add (string text, int imageIndex)
2544                         {
2545                                 ListViewItem item = new ListViewItem (text, imageIndex);
2546                                 return this.Add (item);
2547                         }
2548
2549                         public void AddRange (ListViewItem [] values)
2550                         {
2551                                 list.Clear ();
2552                                 owner.SelectedItems.list.Clear ();
2553                                 owner.SelectedIndices.list.Clear ();
2554                                 owner.CheckedItems.list.Clear ();
2555                                 owner.CheckedIndices.list.Clear ();
2556
2557                                 foreach (ListViewItem item in values) {
2558                                         item.Owner = owner;
2559                                         list.Add (item);
2560                                 }
2561
2562                                 if (owner.Sorting != SortOrder.None)
2563                                         owner.Sort ();
2564
2565                                 owner.Redraw (true);
2566                         }
2567
2568                         public virtual void Clear ()
2569                         {
2570                                 owner.SetFocusedItem (null);
2571                                 owner.h_scroll.Value = owner.v_scroll.Value = 0;
2572                                 list.Clear ();
2573                                 owner.SelectedItems.list.Clear ();
2574                                 owner.SelectedIndices.list.Clear ();
2575                                 owner.CheckedItems.list.Clear ();
2576                                 owner.CheckedIndices.list.Clear ();
2577                                 owner.Redraw (true);
2578                         }
2579
2580                         public bool Contains (ListViewItem item)
2581                         {
2582                                 return list.Contains (item);
2583                         }
2584
2585                         public void CopyTo (Array dest, int index)
2586                         {
2587                                 list.CopyTo (dest, index);
2588                         }
2589
2590                         public IEnumerator GetEnumerator ()
2591                         {
2592                                 return list.GetEnumerator ();
2593                         }
2594
2595                         int IList.Add (object item)
2596                         {
2597                                 int result;
2598                                 ListViewItem li;
2599
2600                                 if (item is ListViewItem) {
2601                                         li = (ListViewItem) item;
2602                                         if (list.Contains (li))
2603                                                 throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "item");
2604                                 }
2605                                 else
2606                                         li = new ListViewItem (item.ToString ());
2607
2608                                 li.Owner = owner;
2609                                 result = list.Add (li);
2610                                 owner.Redraw (true);
2611
2612                                 return result;
2613                         }
2614
2615                         bool IList.Contains (object item)
2616                         {
2617                                 return list.Contains (item);
2618                         }
2619
2620                         int IList.IndexOf (object item)
2621                         {
2622                                 return list.IndexOf (item);
2623                         }
2624
2625                         void IList.Insert (int index, object item)
2626                         {
2627                                 if (item is ListViewItem)
2628                                         this.Insert (index, (ListViewItem) item);
2629                                 else
2630                                         this.Insert (index, item.ToString ());
2631                         }
2632
2633                         void IList.Remove (object item)
2634                         {
2635                                 Remove ((ListViewItem) item);
2636                         }
2637
2638                         public int IndexOf (ListViewItem item)
2639                         {
2640                                 return list.IndexOf (item);
2641                         }
2642
2643                         public ListViewItem Insert (int index, ListViewItem item)
2644                         {
2645                                 // LAMESPEC: MSDOCS say greater than or equal to the value of the Count property
2646                                 // but it's really only greater.
2647                                 if (index < 0 || index > list.Count)
2648                                         throw new ArgumentOutOfRangeException ("index");
2649
2650                                 if (list.Contains (item))
2651                                         throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "item");
2652
2653                                 item.Owner = owner;
2654                                 list.Insert (index, item);
2655                                 owner.Redraw (true);
2656                                 return item;
2657                         }
2658
2659                         public ListViewItem Insert (int index, string text)
2660                         {
2661                                 return this.Insert (index, new ListViewItem (text));
2662                         }
2663
2664                         public ListViewItem Insert (int index, string text, int imageIndex)
2665                         {
2666                                 return this.Insert (index, new ListViewItem (text, imageIndex));
2667                         }
2668
2669                         public virtual void Remove (ListViewItem item)
2670                         {
2671                                 if (!list.Contains (item))
2672                                         return;
2673
2674                                 owner.SelectedItems.list.Remove (item);
2675                                 owner.SelectedIndices.list.Remove (item.Index);
2676                                 owner.CheckedItems.list.Remove (item);
2677                                 owner.CheckedIndices.list.Remove (item.Index);
2678                                 list.Remove (item);
2679                                 owner.Redraw (true);
2680                         }
2681
2682                         public virtual void RemoveAt (int index)
2683                         {
2684                                 if (index < 0 || index >= list.Count)
2685                                         throw new ArgumentOutOfRangeException ("index");
2686
2687                                 list.RemoveAt (index);
2688                                 owner.SelectedItems.list.RemoveAt (index);
2689                                 owner.SelectedIndices.list.RemoveAt (index);
2690                                 owner.CheckedItems.list.RemoveAt (index);
2691                                 owner.CheckedIndices.list.RemoveAt (index);
2692                                 owner.Redraw (false);
2693                         }
2694                         #endregion      // Public Methods
2695
2696                 }       // ListViewItemCollection
2697
2698                 public class SelectedIndexCollection : IList, ICollection, IEnumerable
2699                 {
2700                         internal ArrayList list;
2701                         private ListView owner;
2702
2703                         #region Public Constructor
2704                         public SelectedIndexCollection (ListView owner)
2705                         {
2706                                 list = new ArrayList ();
2707                                 this.owner = owner;
2708                         }
2709                         #endregion      // Public Constructor
2710
2711                         #region Public Properties
2712                         [Browsable (false)]
2713                         public int Count {
2714                                 get { return list.Count; }
2715                         }
2716
2717                         public bool IsReadOnly {
2718                                 get { return true; }
2719                         }
2720
2721                         public int this [int index] {
2722                                 get {
2723                                         if (index < 0 || index >= list.Count)
2724                                                 throw new ArgumentOutOfRangeException ("index");
2725                                         return (int) list [index];
2726                                 }
2727                         }
2728
2729                         bool ICollection.IsSynchronized {
2730                                 get { return list.IsSynchronized; }
2731                         }
2732
2733                         object ICollection.SyncRoot {
2734                                 get { return this; }
2735                         }
2736
2737                         bool IList.IsFixedSize {
2738                                 get { return true; }
2739                         }
2740
2741                         object IList.this [int index] {
2742                                 get { return this [index]; }
2743                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2744                         }
2745                         #endregion      // Public Properties
2746
2747                         #region Public Methods
2748                         public bool Contains (int selectedIndex)
2749                         {
2750                                 return list.Contains (selectedIndex);
2751                         }
2752
2753                         public void CopyTo (Array dest, int index)
2754                         {
2755                                 list.CopyTo (dest, index);
2756                         }
2757
2758                         public IEnumerator GetEnumerator ()
2759                         {
2760                                 return list.GetEnumerator ();
2761                         }
2762
2763                         int IList.Add (object value)
2764                         {
2765                                 throw new NotSupportedException ("Add operation is not supported.");
2766                         }
2767
2768                         void IList.Clear ()
2769                         {
2770                                 throw new NotSupportedException ("Clear operation is not supported.");
2771                         }
2772
2773                         bool IList.Contains (object selectedIndex)
2774                         {
2775                                 return list.Contains (selectedIndex);
2776                         }
2777
2778                         int IList.IndexOf (object selectedIndex)
2779                         {
2780                                 return list.IndexOf (selectedIndex);
2781                         }
2782
2783                         void IList.Insert (int index, object value)
2784                         {
2785                                 throw new NotSupportedException ("Insert operation is not supported.");
2786                         }
2787
2788                         void IList.Remove (object value)
2789                         {
2790                                 throw new NotSupportedException ("Remove operation is not supported.");
2791                         }
2792
2793                         void IList.RemoveAt (int index)
2794                         {
2795                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2796                         }
2797
2798                         public int IndexOf (int selectedIndex)
2799                         {
2800                                 return list.IndexOf (selectedIndex);
2801                         }
2802                         #endregion      // Public Methods
2803
2804                 }       // SelectedIndexCollection
2805
2806                 public class SelectedListViewItemCollection : IList, ICollection, IEnumerable
2807                 {
2808                         internal ArrayList list;
2809                         private ListView owner;
2810
2811                         #region Public Constructor
2812                         public SelectedListViewItemCollection (ListView owner)
2813                         {
2814                                 list = new ArrayList ();
2815                                 this.owner = owner;
2816                         }
2817                         #endregion      // Public Constructor
2818
2819                         #region Public Properties
2820                         [Browsable (false)]
2821                         public int Count {
2822                                 get { return list.Count; }
2823                         }
2824
2825                         public bool IsReadOnly {
2826                                 get { return true; }
2827                         }
2828
2829                         public ListViewItem this [int index] {
2830                                 get {
2831                                         if (index < 0 || index >= list.Count)
2832                                                 throw new ArgumentOutOfRangeException ("index");
2833                                         return (ListViewItem) list [index];
2834                                 }
2835                         }
2836
2837                         bool ICollection.IsSynchronized {
2838                                 get { return list.IsSynchronized; }
2839                         }
2840
2841                         object ICollection.SyncRoot {
2842                                 get { return this; }
2843                         }
2844
2845                         bool IList.IsFixedSize {
2846                                 get { return true; }
2847                         }
2848
2849                         object IList.this [int index] {
2850                                 get { return this [index]; }
2851                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2852                         }
2853                         #endregion      // Public Properties
2854
2855                         #region Public Methods
2856                         public void Clear ()
2857                         {
2858                                 ArrayList copy = (ArrayList) list.Clone ();
2859                                 for (int i = 0; i < copy.Count; i++)
2860                                         ((ListViewItem) copy [i]).Selected = false;
2861
2862                                 list.Clear ();
2863                         }
2864
2865                         public bool Contains (ListViewItem item)
2866                         {
2867                                 return list.Contains (item);
2868                         }
2869
2870                         public void CopyTo (Array dest, int index)
2871                         {
2872                                 list.CopyTo (dest, index);
2873                         }
2874
2875                         public IEnumerator GetEnumerator ()
2876                         {
2877                                 return list.GetEnumerator ();
2878                         }
2879
2880                         int IList.Add (object value)
2881                         {
2882                                 throw new NotSupportedException ("Add operation is not supported.");
2883                         }
2884
2885                         bool IList.Contains (object item)
2886                         {
2887                                 return list.Contains (item);
2888                         }
2889
2890                         int IList.IndexOf (object item)
2891                         {
2892                                 return list.IndexOf (item);
2893                         }
2894
2895                         void IList.Insert (int index, object value)
2896                         {
2897                                 throw new NotSupportedException ("Insert operation is not supported.");
2898                         }
2899
2900                         void IList.Remove (object value)
2901                         {
2902                                 throw new NotSupportedException ("Remove operation is not supported.");
2903                         }
2904
2905                         void IList.RemoveAt (int index)
2906                         {
2907                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2908                         }
2909
2910                         public int IndexOf (ListViewItem item)
2911                         {
2912                                 return list.IndexOf (item);
2913                         }
2914                         #endregion      // Public Methods
2915
2916                 }       // SelectedListViewItemCollection
2917
2918                 #endregion // Subclasses
2919         }
2920 }