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 = new ItemComparer ();
  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                         GotFocus += new EventHandler (FocusChanged);
 170                         LostFocus += new EventHandler (FocusChanged);
 171
 172                         this.SetStyle (ControlStyles.UserPaint | ControlStyles.StandardClick, false);
 173                 }
 174                 #endregion      // Public Constructors
 175
 176                 #region Private Internal Properties
 177                 internal Size CheckBoxSize {
 178                         get {
 179                                 if (this.check_boxes) {
 180                                         if (this.state_image_list != null)
 181                                                 return this.state_image_list.ImageSize;
 182                                         else
 183                                                 return ThemeEngine.Current.ListViewCheckBoxSize;
 184                                 }
 185                                 return Size.Empty;
 186                         }
 187                 }
 188
 189                 bool multiselecting;
 190
 191                 bool CanMultiselect {
 192                         get {
 193                                 if (multiselecting)
 194                                         return true;
 195                                 else if (multiselect && (XplatUI.State.ModifierKeys & (Keys.Control | Keys.Shift)) != 0)
 196                                         return true;
 197                                 else
 198                                         return false;
 199                         }
 200                 }
 201
 202                 #endregion      // Private Internal Properties
 203
 204                 #region  Protected Properties
 205                 protected override CreateParams CreateParams {
 206                         get { return base.CreateParams; }
 207                 }
 208
 209                 protected override Size DefaultSize {
 210                         get { return ThemeEngine.Current.ListViewDefaultSize; }
 211                 }
 212                 #endregion      // Protected Properties
 213
 214                 #region Public Instance Properties
 215                 [DefaultValue (ItemActivation.Standard)]
 216                 public ItemActivation Activation {
 217                         get { return activation; }
 218                         set {
 219                                 if (value != ItemActivation.Standard && value != ItemActivation.OneClick &&
 220                                         value != ItemActivation.TwoClick) {
 221                                         throw new InvalidEnumArgumentException (string.Format
 222                                                 ("Enum argument value '{0}' is not valid for Activation", value));
 223                                 }
 224
 225                                 activation = value;
 226                         }
 227                 }
 228
 229                 [DefaultValue (ListViewAlignment.Top)]
 230                 [Localizable (true)]
 231                 public ListViewAlignment Alignment {
 232                         get { return alignment; }
 233                         set {
 234                                 if (value != ListViewAlignment.Default && value != ListViewAlignment.Left &&
 235                                         value != ListViewAlignment.SnapToGrid && value != ListViewAlignment.Top) {
 236                                         throw new InvalidEnumArgumentException (string.Format
 237                                                 ("Enum argument value '{0}' is not valid for Alignment", value));
 238                                 }
 239
 240                                 if (this.alignment != value) {
 241                                         alignment = value;
 242                                         // alignment does not matter in Details/List views
 243                                         if (this.view == View.LargeIcon ||
 244                                             this.View == View.SmallIcon)
 245                                                 this.Redraw (true);
 246                                 }
 247                         }
 248                 }
 249
 250                 [DefaultValue (false)]
 251                 public bool AllowColumnReorder {
 252                         get { return allow_column_reorder; }
 253                         set { allow_column_reorder = value; }
 254                 }
 255
 256                 [DefaultValue (true)]
 257                 public bool AutoArrange {
 258                         get { return auto_arrange; }
 259                         set {
 260                                 if (auto_arrange != value) {
 261                                         auto_arrange = value;
 262                                         // autoarrange does not matter in Details/List views
 263                                         if (this.view == View.LargeIcon || this.View == View.SmallIcon)
 264                                                 this.Redraw (true);
 265                                 }
 266                         }
 267                 }
 268
 269                 public override Color BackColor {
 270                         get {
 271                                 if (background_color.IsEmpty)
 272                                         return ThemeEngine.Current.ColorWindow;
 273                                 else
 274                                         return background_color;
 275                         }
 276                         set { background_color = value; }
 277                 }
 278
 279                 [Browsable (false)]
 280                 [EditorBrowsable (EditorBrowsableState.Never)]
 281                 public override Image BackgroundImage {
 282                         get { return background_image; }
 283                         set {
 284                                 if (value == background_image)
 285                                         return;
 286
 287                                 background_image = value;
 288                                 OnBackgroundImageChanged (EventArgs.Empty);
 289                         }
 290                 }
 291
 292                 [DefaultValue (BorderStyle.Fixed3D)]
 293                 [DispId (-504)]
 294                 public BorderStyle BorderStyle {
 295                         get { return InternalBorderStyle; }
 296                         set { InternalBorderStyle = value; }
 297                 }
 298
 299                 [DefaultValue (false)]
 300                 public bool CheckBoxes {
 301                         get { return check_boxes; }
 302                         set {
 303                                 if (check_boxes != value) {
 304                                         check_boxes = value;
 305                                         this.Redraw (true);
 306                                 }
 307                         }
 308                 }
 309
 310                 [Browsable (false)]
 311                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 312                 public CheckedIndexCollection CheckedIndices {
 313                         get { return checked_indices; }
 314                 }
 315
 316                 [Browsable (false)]
 317                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 318                 public CheckedListViewItemCollection CheckedItems {
 319                         get { return checked_items; }
 320                 }
 321
 322                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 323                 [Localizable (true)]
 324                 [MergableProperty (false)]
 325                 public ColumnHeaderCollection Columns {
 326                         get { return columns; }
 327                 }
 328
 329                 [Browsable (false)]
 330                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 331                 public ListViewItem FocusedItem {
 332                         get {
 333                                 return focused_item;
 334                         }
 335                 }
 336
 337                 public override Color ForeColor {
 338                         get {
 339                                 if (foreground_color.IsEmpty)
 340                                         return ThemeEngine.Current.ColorWindowText;
 341                                 else
 342                                         return foreground_color;
 343                         }
 344                         set { foreground_color = value; }
 345                 }
 346
 347                 [DefaultValue (false)]
 348                 public bool FullRowSelect {
 349                         get { return full_row_select; }
 350                         set { full_row_select = value; }
 351                 }
 352
 353                 [DefaultValue (false)]
 354                 public bool GridLines {
 355                         get { return grid_lines; }
 356                         set {
 357                                 if (grid_lines != value) {
 358                                         grid_lines = value;
 359                                         this.Redraw (false);
 360                                 }
 361                         }
 362                 }
 363
 364                 [DefaultValue (ColumnHeaderStyle.Clickable)]
 365                 public ColumnHeaderStyle HeaderStyle {
 366                         get { return header_style; }
 367                         set {
 368                                 if (header_style == value)
 369                                         return;
 370
 371                                 switch (value) {
 372                                 case ColumnHeaderStyle.Clickable:
 373                                 case ColumnHeaderStyle.Nonclickable:
 374                                 case ColumnHeaderStyle.None:
 375                                         break;
 376                                 default:
 377                                         throw new InvalidEnumArgumentException (string.Format
 378                                                 ("Enum argument value '{0}' is not valid for ColumnHeaderStyle", value));
 379                                 }
 380
 381                                 header_style = value;
 382                                 if (view == View.Details)
 383                                         Redraw (true);
 384                         }
 385                 }
 386
 387                 [DefaultValue (true)]
 388                 public bool HideSelection {
 389                         get { return hide_selection; }
 390                         set {
 391                                 if (hide_selection != value) {
 392                                         hide_selection = value;
 393                                         this.Redraw (false);
 394                                 }
 395                         }
 396                 }
 397
 398                 [DefaultValue (false)]
 399                 public bool HoverSelection {
 400                         get { return hover_selection; }
 401                         set { hover_selection = value; }
 402                 }
 403
 404                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 405                 [Localizable (true)]
 406                 [MergableProperty (false)]
 407                 public ListViewItemCollection Items {
 408                         get { return items; }
 409                 }
 410
 411                 [DefaultValue (false)]
 412                 public bool LabelEdit {
 413                         get { return label_edit; }
 414                         set { label_edit = value; }
 415                 }
 416
 417                 [DefaultValue (true)]
 418                 [Localizable (true)]
 419                 public bool LabelWrap {
 420                         get { return label_wrap; }
 421                         set {
 422                                 if (label_wrap != value) {
 423                                         label_wrap = value;
 424                                         this.Redraw (true);
 425                                 }
 426                         }
 427                 }
 428
 429                 [DefaultValue (null)]
 430                 public ImageList LargeImageList {
 431                         get { return large_image_list; }
 432                         set {
 433                                 large_image_list = value;
 434                                 this.Redraw (true);
 435                         }
 436                 }
 437
 438                 [Browsable (false)]
 439                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 440                 public IComparer ListViewItemSorter {
 441                         get { return item_sorter; }
 442                         set { item_sorter = value; }
 443                 }
 444
 445                 [DefaultValue (true)]
 446                 public bool MultiSelect {
 447                         get { return multiselect; }
 448                         set { multiselect = value; }
 449                 }
 450
 451                 [DefaultValue (true)]
 452                 public bool Scrollable {
 453                         get { return scrollable; }
 454                         set {
 455                                 if (scrollable != value) {
 456                                         scrollable = value;
 457                                         this.Redraw (true);
 458                                 }
 459                         }
 460                 }
 461
 462                 [Browsable (false)]
 463                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 464                 public SelectedIndexCollection SelectedIndices {
 465                         get { return selected_indices; }
 466                 }
 467
 468                 [Browsable (false)]
 469                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 470                 public SelectedListViewItemCollection SelectedItems {
 471                         get { return selected_items; }
 472                 }
 473
 474 #if NET_2_0
 475                 [MonoTODO("Implement")]
 476                 public bool ShowGroups {
 477                         get {
 478                                 return false;
 479                         }
 480
 481                         set {
 482                         }
 483                 }
 484 #endif
 485
 486                 [DefaultValue (null)]
 487                 public ImageList SmallImageList {
 488                         get { return small_image_list; }
 489                         set {
 490                                 small_image_list = value;
 491                                 this.Redraw (true);
 492                         }
 493                 }
 494
 495                 [DefaultValue (SortOrder.None)]
 496                 public SortOrder Sorting {
 497                         get { return sort_order; }
 498                         set {
 499                                 if (value != SortOrder.Ascending && value != SortOrder.Descending  &&
 500                                         value != SortOrder.None) {
 501                                         throw new InvalidEnumArgumentException (string.Format
 502                                                 ("Enum argument value '{0}' is not valid for Sorting", value));
 503                                 }
 504
 505                                 if (sort_order != value)  {
 506                                         sort_order = value;
 507                                         this.Redraw (false);
 508                                 }
 509                         }
 510                 }
 511
 512                 [DefaultValue (null)]
 513                 public ImageList StateImageList {
 514                         get { return state_image_list; }
 515                         set {
 516                                 state_image_list = value;
 517                                 this.Redraw (true);
 518                         }
 519                 }
 520
 521                 [Bindable (false)]
 522                 [Browsable (false)]
 523                 [EditorBrowsable (EditorBrowsableState.Never)]
 524                 public override string Text {
 525                         get { return text; }
 526                         set {
 527                                 if (value == text)
 528                                         return;
 529
 530                                 text = value;
 531                                 this.Redraw (true);
 532
 533                                 OnTextChanged (EventArgs.Empty);
 534                         }
 535                 }
 536
 537                 [Browsable (false)]
 538                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 539                 public ListViewItem TopItem {
 540                         get {
 541                                 // there is no item
 542                                 if (this.items.Count == 0)
 543                                         return null;
 544                                 // if contents are not scrolled
 545                                 // it is the first item
 546                                 else if (h_marker == 0 && v_marker == 0)
 547                                         return this.items [0];
 548                                 // do a hit test for the scrolled position
 549                                 else {
 550                                         foreach (ListViewItem item in this.items) {
 551                                                 if (item.Bounds.X >= 0 && item.Bounds.Y >= 0)
 552                                                         return item;
 553                                         }
 554                                         return null;
 555                                 }
 556                         }
 557                 }
 558
 559 #if NET_2_0
 560                 [MonoTODO("Implement")]
 561                 public bool UseCompatibleStateImageBehavior {
 562                         get {
 563                                 return false;
 564                         }
 565
 566                         set {
 567                         }
 568                 }
 569 #endif
 570
 571                 [DefaultValue (View.LargeIcon)]
 572                 public View View {
 573                         get { return view; }
 574                         set {
 575                                 if (value != View.Details && value != View.LargeIcon  &&
 576                                         value != View.List  && value != View.SmallIcon  ) {
 577                                         throw new InvalidEnumArgumentException (string.Format
 578                                                 ("Enum argument value '{0}' is not valid for View", value));
 579                                 }
 580
 581                                 if (view != value) {
 582                                         h_scroll.Value = v_scroll.Value = 0;
 583                                         view = value;
 584                                         Redraw (true);
 585                                 }
 586                         }
 587                 }
 588                 #endregion      // Public Instance Properties
 589
 590                 #region Internal Methods Properties
 591
 592                 internal int FirstVisibleIndex {
 593                         get {
 594                                 // there is no item
 595                                 if (this.items.Count == 0)
 596                                         return 0;
 597
 598                                 if (h_marker == 0 && v_marker == 0)
 599                                         return 0;
 600
 601                                 foreach (ListViewItem item in this.items) {
 602                                         if (item.Bounds.Right >= 0 && item.Bounds.Bottom >= 0)
 603                                                 return item.Index;
 604                                 }
 605                                 return 0;
 606
 607                         }
 608                 }
 609
 610
 611                 internal int LastVisibleIndex {
 612                         get {
 613                                 for (int i = FirstVisibleIndex; i < Items.Count; i++) {
 614                                         if (View == View.List || Alignment == ListViewAlignment.Left) {
 615                                                 if (Items[i].Bounds.X > ClientRectangle.Right)
 616                                                         return i - 1;
 617                                         } else {
 618                                                 if (Items[i].Bounds.Y > ClientRectangle.Bottom)
 619                                                         return i - 1;
 620                                         }
 621                                 }
 622
 623                                 return Items.Count - 1;
 624                         }
 625                 }
 626
 627                 internal int TotalWidth {
 628                         get { return Math.Max (this.Width, this.layout_wd); }
 629                 }
 630
 631                 internal int TotalHeight {
 632                         get { return Math.Max (this.Height, this.layout_ht); }
 633                 }
 634
 635                 internal void Redraw (bool recalculate)
 636                 {
 637                         // Avoid calculations when control is being updated
 638                         if (this.updating)
 639                                 return;
 640
 641                         if (recalculate)
 642                                 CalculateListView (this.alignment);
 643
 644                         Refresh ();
 645                 }
 646
 647                 internal Size GetChildColumnSize (int index)
 648                 {
 649                         Size ret_size = Size.Empty;
 650                         ColumnHeader col = this.columns [index];
 651
 652                         if (col.Width == -2) { // autosize = max(items, columnheader)
 653                                 Size size = Size.Ceiling (this.DeviceContext.MeasureString
 654                                                           (col.Text, this.Font));
 655                                 ret_size = BiggestItem (index);
 656                                 if (size.Width > ret_size.Width)
 657                                         ret_size = size;
 658                         }
 659                         else { // -1 and all the values < -2 are put under one category
 660                                 ret_size = BiggestItem (index);
 661                                 // fall back to empty columns' width if no subitem is available for a column
 662                                 if (ret_size.IsEmpty) {
 663                                         ret_size.Width = ThemeEngine.Current.ListViewEmptyColumnWidth;
 664                                         if (col.Text.Length > 0)
 665                                                 ret_size.Height = Size.Ceiling (this.DeviceContext.MeasureString
 666                                                                                 (col.Text, this.Font)).Height;
 667                                         else
 668                                                 ret_size.Height = this.Font.Height;
 669                                 }
 670                         }
 671
 672                         // adjust the size for icon and checkbox for 0th column
 673                         if (index == 0) {
 674                                 ret_size.Width += (this.CheckBoxSize.Width + 4);
 675                                 if (this.small_image_list != null)
 676                                         ret_size.Width += this.small_image_list.ImageSize.Width;
 677                         }
 678                         return ret_size;
 679                 }
 680
 681                 // Returns the size of biggest item text in a column.
 682                 private Size BiggestItem (int col)
 683                 {
 684                         Size temp = Size.Empty;
 685                         Size ret_size = Size.Empty;
 686
 687                         // 0th column holds the item text, we check the size of
 688                         // the various subitems falling in that column and get
 689                         // the biggest one's size.
 690                         foreach (ListViewItem item in items) {
 691                                 if (col >= item.SubItems.Count)
 692                                         continue;
 693
 694                                 temp = Size.Ceiling (this.DeviceContext.MeasureString
 695                                                      (item.SubItems [col].Text, this.Font));
 696                                 if (temp.Width > ret_size.Width)
 697                                         ret_size = temp;
 698                         }
 699
 700                         // adjustment for space
 701                         if (!ret_size.IsEmpty)
 702                                 ret_size.Width += 4;
 703
 704                         return ret_size;
 705                 }
 706
 707                 // Sets the size of the biggest item text as per the view
 708                 private void CalcTextSize ()
 709                 {
 710                         // clear the old value
 711                         text_size = Size.Empty;
 712
 713                         if (items.Count == 0)
 714                                 return;
 715
 716                         text_size = BiggestItem (0);
 717
 718                         if (view == View.LargeIcon && this.label_wrap) {
 719                                 Size temp = Size.Empty;
 720                                 if (this.check_boxes)
 721                                         temp.Width += 2 * this.CheckBoxSize.Width;
 722                                 if (large_image_list != null)
 723                                         temp.Width += large_image_list.ImageSize.Width;
 724                                 if (temp.Width == 0)
 725                                         temp.Width = 43;
 726                                 // wrapping is done for two lines only
 727                                 if (text_size.Width > temp.Width) {
 728                                         text_size.Width = temp.Width;
 729                                         text_size.Height *= 2;
 730                                 }
 731                         }
 732                         else if (view == View.List) {
 733                                 // in list view max text shown in determined by the
 734                                 // control width, even if scolling is enabled.
 735                                 int max_wd = this.Width - (this.CheckBoxSize.Width - 2);
 736                                 if (this.small_image_list != null)
 737                                         max_wd -= this.small_image_list.ImageSize.Width;
 738
 739                                 if (text_size.Width > max_wd)
 740                                         text_size.Width = max_wd;
 741                         }
 742
 743                         // we do the default settings, if we have got 0's
 744                         if (text_size.Height <= 0)
 745                                 text_size.Height = this.Font.Height;
 746                         if (text_size.Width <= 0)
 747                                 text_size.Width = this.Width;
 748
 749                         // little adjustment
 750                         text_size.Width += 4;
 751                         text_size.Height += 2;
 752                 }
 753
 754                 private void Scroll (ScrollBar scrollbar, int delta)
 755                 {
 756                         if (delta == 0 || !scrollbar.Visible)
 757                                 return;
 758
 759                         int max;
 760                         if (scrollbar == h_scroll)
 761                                 max = h_scroll.Maximum - item_control.Width;
 762                         else
 763                                 max = v_scroll.Maximum - item_control.Height;
 764
 765                         int val = scrollbar.Value + delta;
 766                         if (val > max)
 767                                 val = max;
 768                         else if (val < scrollbar.Minimum)
 769                                 val = scrollbar.Minimum;
 770                         scrollbar.Value = val;
 771                 }
 772
 773                 private void CalculateScrollBars ()
 774                 {
 775                         Rectangle client_area = ClientRectangle;
 776
 777                         if (!this.scrollable || this.items.Count <= 0) {
 778                                 h_scroll.Visible = false;
 779                                 v_scroll.Visible = false;
 780                                 return;
 781                         }
 782
 783                         // Don't calculate if the view is not displayable
 784                         if (client_area.Height < 0 || client_area.Width < 0)
 785                                 return;
 786
 787                         // making a scroll bar visible might make
 788                         // other scroll bar visible
 789                         if (layout_wd > client_area.Right) {
 790                                 h_scroll.Visible = true;
 791                                 if ((layout_ht + h_scroll.Height) > client_area.Bottom)
 792                                         v_scroll.Visible = true;
 793                                 else
 794                                         v_scroll.Visible = false;
 795                         } else if (layout_ht > client_area.Bottom) {
 796                                 v_scroll.Visible = true;
 797                                 if ((layout_wd + v_scroll.Width) > client_area.Right)
 798                                         h_scroll.Visible = true;
 799                                 else
 800                                         h_scroll.Visible = false;
 801                         } else {
 802                                 h_scroll.Visible = false;
 803                                 v_scroll.Visible = false;
 804                         }
 805
 806                         item_control.Height = ClientRectangle.Height - header_control.Height;
 807
 808                         if (h_scroll.Visible) {
 809                                 h_scroll.Location = new Point (client_area.X, client_area.Bottom - h_scroll.Height);
 810                                 h_scroll.Minimum = 0;
 811
 812                                 // if v_scroll is visible, adjust the maximum of the
 813                                 // h_scroll to account for the width of v_scroll
 814                                 if (v_scroll.Visible) {
 815                                         h_scroll.Maximum = layout_wd + v_scroll.Width;
 816                                         h_scroll.Width = client_area.Width - v_scroll.Width;
 817                                 }
 818                                 else {
 819                                         h_scroll.Maximum = layout_wd;
 820                                         h_scroll.Width = client_area.Width;
 821                                 }
 822
 823                                 h_scroll.LargeChange = client_area.Width;
 824                                 h_scroll.SmallChange = Font.Height;
 825                                 item_control.Height -= h_scroll.Height;
 826                         }
 827
 828                         if (header_control.Visible)
 829                                 header_control.Width = ClientRectangle.Width;
 830                         item_control.Width = ClientRectangle.Width;
 831
 832                         if (v_scroll.Visible) {
 833                                 v_scroll.Location = new Point (client_area.Right - v_scroll.Width, client_area.Y);
 834                                 v_scroll.Minimum = 0;
 835
 836                                 // if h_scroll is visible, adjust the maximum of the
 837                                 // v_scroll to account for the height of h_scroll
 838                                 if (h_scroll.Visible) {
 839                                         v_scroll.Maximum = layout_ht + h_scroll.Height;
 840                                         v_scroll.Height = client_area.Height; // - h_scroll.Height already done
 841                                 } else {
 842                                         v_scroll.Maximum = layout_ht;
 843                                         v_scroll.Height = client_area.Height;
 844                                 }
 845
 846                                 v_scroll.LargeChange = client_area.Height;
 847                                 v_scroll.SmallChange = Font.Height;
 848                                 if (header_control.Visible)
 849                                         header_control.Width -= v_scroll.Width;
 850                                 item_control.Width -= v_scroll.Width;
 851                         }
 852                 }
 853
 854                 ColumnHeader GetReorderedColumn (int index)
 855                 {
 856                         if (reordered_column_indices == null)
 857                                 return Columns [index];
 858                         else
 859                                 return Columns [reordered_column_indices [index]];
 860                 }
 861
 862                 void ReorderColumn (ColumnHeader col, int index)
 863                 {
 864                         if (reordered_column_indices == null) {
 865                                 reordered_column_indices = new int [Columns.Count];
 866                                 for (int i = 0; i < Columns.Count; i++)
 867                                         reordered_column_indices [i] = i;
 868                         }
 869
 870                         if (reordered_column_indices [index] == col.Index)
 871                                 return;
 872
 873                         int[] curr = reordered_column_indices;
 874                         int[] result = new int [Columns.Count];
 875                         int curr_idx = 0;
 876                         for (int i = 0; i < Columns.Count; i++) {
 877                                 if (curr_idx < Columns.Count && curr [curr_idx] == col.Index)
 878                                         curr_idx++;
 879
 880                                 if (i == index)
 881                                         result [i] = col.Index;
 882                                 else
 883                                         result [i] = curr [curr_idx++];
 884                         }
 885
 886                         reordered_column_indices = result;
 887                         LayoutDetails ();
 888                         header_control.Invalidate ();
 889                         item_control.Invalidate ();
 890                 }
 891
 892                 Size LargeIconItemSize {
 893                         get {
 894                                 int image_w = LargeImageList == null ? 12 : LargeImageList.ImageSize.Width;
 895                                 int image_h = LargeImageList == null ? 2 : LargeImageList.ImageSize.Height;
 896                                 int w = CheckBoxSize.Width + 2 + Math.Max (text_size.Width, image_w);
 897                                 int h = text_size.Height + 2 + Math.Max (CheckBoxSize.Height, image_h);
 898                                 return new Size (w, h);
 899                         }
 900                 }
 901
 902                 Size SmallIconItemSize {
 903                         get {
 904                                 int image_w = SmallImageList == null ? 0 : SmallImageList.ImageSize.Width;
 905                                 int image_h = SmallImageList == null ? 0 : SmallImageList.ImageSize.Height;
 906                                 int w = text_size.Width + 2 + CheckBoxSize.Width + image_w;
 907                                 int h = Math.Max (text_size.Height, Math.Max (CheckBoxSize.Height, image_h));
 908                                 return new Size (w, h);
 909                         }
 910                 }
 911
 912                 int rows;
 913                 int cols;
 914                 ListViewItem[,] item_matrix;
 915
 916                 void LayoutIcons (bool large_icons, bool left_aligned, int x_spacing, int y_spacing)
 917                 {
 918                         header_control.Visible = false;
 919                         header_control.Size = Size.Empty;
 920                         item_control.Visible = true;
 921                         item_control.Location = Point.Empty;
 922
 923                         if (items.Count == 0)
 924                                 return;
 925
 926                         Size sz = large_icons ? LargeIconItemSize : SmallIconItemSize;
 927
 928                         Rectangle area = ClientRectangle;
 929
 930                         if (left_aligned) {
 931                                 rows = (int) Math.Floor ((double)(area.Height - h_scroll.Height + y_spacing) / (double)(sz.Height + y_spacing));
 932                                 if (rows <= 0)
 933                                         rows = 1;
 934                                 cols = (int) Math.Ceiling ((double)items.Count / (double)rows);
 935                         } else {
 936                                 cols = (int) Math.Floor ((double)(area.Width - v_scroll.Width + x_spacing) / (double)(sz.Width + x_spacing));
 937                                 if (cols <= 0)
 938                                         cols = 1;
 939                                 rows = (int) Math.Ceiling ((double)items.Count / (double)cols);
 940                         }
 941
 942                         layout_ht = rows * (sz.Height + y_spacing) - y_spacing;
 943                         layout_wd = cols * (sz.Width + x_spacing) - x_spacing;
 944                         item_matrix = new ListViewItem [rows, cols];
 945                         int row = 0;
 946                         int col = 0;
 947                         foreach (ListViewItem item in items) {
 948                                 int x = col * (sz.Width + x_spacing);
 949                                 int y = row * (sz.Height + y_spacing);
 950                                 item.Location = new Point (x, y);
 951                                 item.Layout ();
 952                                 item.row = row;
 953                                 item.col = col;
 954                                 item_matrix [row, col] = item;
 955                                 if (left_aligned) {
 956                                         if (++row == rows) {
 957                                                 row = 0;
 958                                                 col++;
 959                                         }
 960                                 } else {
 961                                         if (++col == cols) {
 962                                                 col = 0;
 963                                                 row++;
 964                                         }
 965                                 }
 966                         }
 967
 968                         item_control.Size = new Size (layout_wd, layout_ht);
 969                 }
 970
 971                 void LayoutHeader ()
 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                         if (header_style == ColumnHeaderStyle.None) {
 986                                 header_control.Visible = false;
 987                                 header_control.Size = Size.Empty;
 988                         } else {
 989                                 header_control.Width = x;
 990                                 header_control.Height = columns [0].Ht;
 991                                 header_control.Visible = true;
 992                         }
 993                 }
 994
 995                 void LayoutDetails ()
 996                 {
 997                         if (columns.Count == 0) {
 998                                 header_control.Visible = false;
 999                                 item_control.Visible = false;
1000                                 return;
1001                         }
1002
1003                         LayoutHeader ();
1004
1005                         item_control.Visible = true;
1006                         item_control.Location = new Point (0, header_control.Height);
1007
1008                         int y = 0;
1009                         if (items.Count > 0) {
1010                                 foreach (ListViewItem item in items) {
1011                                         item.Layout ();
1012                                         item.Location = new Point (0, y);
1013                                         y += item.Bounds.Height + 2;
1014                                 }
1015
1016                                 // some space for bottom gridline
1017                                 if (grid_lines)
1018                                         y += 2;
1019                         }
1020
1021                         layout_wd = Math.Max (header_control.Width, item_control.Width);
1022                         layout_ht = y + header_control.Height;
1023                 }
1024
1025                 private void CalculateListView (ListViewAlignment align)
1026                 {
1027                         CalcTextSize ();
1028
1029                         switch (view) {
1030                         case View.Details:
1031                                 LayoutDetails ();
1032                                 break;
1033
1034                         case View.SmallIcon:
1035                                 LayoutIcons (false, alignment == ListViewAlignment.Left, 4, 2);
1036                                 break;
1037
1038                         case View.LargeIcon:
1039                                 LayoutIcons (true, alignment == ListViewAlignment.Left,
1040                                              ThemeEngine.Current.ListViewHorizontalSpacing,
1041                                              ThemeEngine.Current.ListViewVerticalSpacing);
1042                                 break;
1043
1044                         case View.List:
1045                                 LayoutIcons (false, true, 4, 2);
1046                                 break;
1047                         }
1048
1049                         CalculateScrollBars ();
1050                 }
1051
1052                 internal void UpdateSelection (ListViewItem item)
1053                 {
1054                         if (item.Selected) {
1055
1056                                 if (!CanMultiselect && SelectedItems.Count > 0) {
1057                                         SelectedItems.Clear ();
1058                                         SelectedIndices.list.Clear ();
1059                                 }
1060
1061                                 if (!SelectedItems.Contains (item)) {
1062                                         SelectedItems.list.Add (item);
1063                                         SelectedIndices.list.Add (item.Index);
1064                                 }
1065                         } else {
1066                                 SelectedItems.list.Remove (item);
1067                                 SelectedIndices.list.Remove (item.Index);
1068                         }
1069                 }
1070
1071                 private bool KeySearchString (KeyEventArgs ke)
1072                 {
1073                         int current_tickcnt = Environment.TickCount;
1074                         if (keysearch_tickcnt > 0 && current_tickcnt - keysearch_tickcnt > keysearch_keydelay) {
1075                                 keysearch_text = string.Empty;
1076                         }
1077
1078                         keysearch_text += (char) ke.KeyData;
1079                         keysearch_tickcnt = current_tickcnt;
1080
1081                         int start = FocusedItem == null ? 0 : FocusedItem.Index;
1082                         int i = start;
1083                         while (true) {
1084                                 if (CultureInfo.CurrentCulture.CompareInfo.IsPrefix (Items[i].Text, keysearch_text,
1085                                         CompareOptions.IgnoreCase)) {
1086                                         SetFocusedItem (Items [i]);
1087                                         items [i].Selected = true;
1088                                         EnsureVisible (i);
1089                                         break;
1090                                 }
1091                                 i = (i + 1  < Items.Count) ? i+1 : 0;
1092
1093                                 if (i == start)
1094                                         break;
1095                         }
1096                         return true;
1097                 }
1098
1099                 int GetAdjustedIndex (Keys key)
1100                 {
1101                         int result = -1;
1102
1103                         if (View == View.Details) {
1104                                 if (key == Keys.Up)
1105                                         result = FocusedItem.Index - 1;
1106                                 else if (key == Keys.Down) {
1107                                         result = FocusedItem.Index + 1;
1108                                         if (result == items.Count)
1109                                                 result = -1;
1110                                 }
1111                                 return result;
1112                         }
1113
1114                         int row = FocusedItem.row;
1115                         int col = FocusedItem.col;
1116
1117                         switch (key) {
1118                         case Keys.Left:
1119                                 if (col == 0)
1120                                         return -1;
1121                                 return item_matrix [row, col - 1].Index;
1122
1123                         case Keys.Right:
1124                                 if (col == (cols - 1))
1125                                         return -1;
1126                                 while (item_matrix [row, col + 1] == null)
1127                                        row--;
1128                                 return item_matrix [row, col + 1].Index;
1129
1130                         case Keys.Up:
1131                                 if (row == 0)
1132                                         return -1;
1133                                 return item_matrix [row - 1, col].Index;
1134
1135                         case Keys.Down:
1136                                 if (row == (rows - 1) || row == Items.Count - 1)
1137                                         return -1;
1138                                 while (item_matrix [row + 1, col] == null)
1139                                        col--;
1140                                 return item_matrix [row + 1, col].Index;
1141
1142                         default:
1143                                 return -1;
1144                         }
1145                 }
1146
1147                 ListViewItem selection_start;
1148
1149                 private bool SelectItems (ArrayList sel_items)
1150                 {
1151                         bool changed = false;
1152                         multiselecting = true;
1153                         ArrayList curr_items = (ArrayList) SelectedItems.list.Clone ();
1154                         foreach (ListViewItem item in curr_items)
1155                                 if (!sel_items.Contains (item)) {
1156                                         item.Selected = false;
1157                                         changed = true;
1158                                 }
1159                         foreach (ListViewItem item in sel_items)
1160                                 if (!item.Selected) {
1161                                         item.Selected = true;
1162                                         changed = true;
1163                                 }
1164                         multiselecting = false;
1165                         return changed;
1166                 }
1167
1168                 private void UpdateMultiSelection (int index)
1169                 {
1170                         bool shift_pressed = (XplatUI.State.ModifierKeys & Keys.Shift) != 0;
1171                         bool ctrl_pressed = (XplatUI.State.ModifierKeys & Keys.Control) != 0;
1172                         ListViewItem item = items [index];
1173
1174                         if (shift_pressed && selection_start != null) {
1175                                 ArrayList list = new ArrayList ();
1176                                 int start = Math.Min (selection_start.Index, index);
1177                                 int end = Math.Max (selection_start.Index, index);
1178                                 if (View == View.Details) {
1179                                         for (int i = start; i <= end; i++)
1180                                                 list.Add (items [i]);
1181                                 } else {
1182                                         int left = Math.Min (items [start].col, items [end].col);
1183                                         int right = Math.Max (items [start].col, items [end].col);
1184                                         int top = Math.Min (items [start].row, items [end].row);
1185                                         int bottom = Math.Max (items [start].row, items [end].row);
1186                                         foreach (ListViewItem curr in items)
1187                                                 if (curr.row >= top && curr.row <= bottom &&
1188                                                     curr.col >= left && curr.col <= right)
1189                                                         list.Add (curr);
1190                                 }
1191                                 if (SelectItems (list))
1192                                         OnSelectedIndexChanged (EventArgs.Empty);
1193                         } else if (!ctrl_pressed) {
1194                                 SelectedItems.Clear ();
1195                                 SelectedIndices.list.Clear ();
1196                                 item.Selected = true;
1197                                 selection_start = item;
1198                                 OnSelectedIndexChanged (EventArgs.Empty);
1199                         }
1200                 }
1201
1202                 private void ListView_KeyDown (object sender, KeyEventArgs ke)
1203                 {
1204                         if (ke.Handled || Items.Count == 0 || !item_control.Visible)
1205                                 return;
1206
1207                         int index = -1;
1208                         ke.Handled = true;
1209
1210                         if (FocusedItem == null)
1211                                 SetFocusedItem (Items [0]);
1212
1213                         switch (ke.KeyCode) {
1214
1215                         case Keys.End:
1216                                 index = Items.Count - 1;
1217                                 break;
1218
1219                         case Keys.Home:
1220                                 index = 0;
1221                                 break;
1222
1223                         case Keys.Left:
1224                         case Keys.Right:
1225                         case Keys.Up:
1226                         case Keys.Down:
1227                                 index = GetAdjustedIndex (ke.KeyCode);
1228                                 break;
1229
1230                         default:
1231                                 ke.Handled = KeySearchString (ke);
1232                                 return;
1233                         }
1234
1235                         if (index == -1)
1236                                 return;
1237
1238                         if (MultiSelect)
1239                                 UpdateMultiSelection (index);
1240                         else if (!items [index].Selected) {
1241                                 items [index].Selected = true;
1242                                 OnSelectedIndexChanged (EventArgs.Empty);
1243                         }
1244
1245                         SetFocusedItem (items [index]);
1246                         EnsureVisible (index);
1247                 }
1248
1249
1250                 internal class ItemControl : Control {
1251
1252                         ListView owner;
1253                         ListViewItem clicked_item;
1254                         ListViewItem last_clicked_item;
1255                         bool hover_processed = false;
1256                         bool checking = false;
1257
1258                         public ItemControl (ListView owner)
1259                         {
1260                                 this.owner = owner;
1261                                 DoubleClick += new EventHandler(ItemsDoubleClick);
1262                                 MouseDown += new MouseEventHandler(ItemsMouseDown);
1263                                 MouseMove += new MouseEventHandler(ItemsMouseMove);
1264                                 MouseHover += new EventHandler(ItemsMouseHover);
1265                                 MouseUp += new MouseEventHandler(ItemsMouseUp);
1266                                 MouseWheel += new MouseEventHandler(ItemsMouseWheel);
1267                         }
1268
1269                         void ItemsDoubleClick (object sender, EventArgs e)
1270                         {
1271                                 if (owner.activation == ItemActivation.Standard && owner.ItemActivate != null)
1272                                         owner.ItemActivate (this, e);
1273                         }
1274
1275                         enum BoxSelect {
1276                                 None,
1277                                 Normal,
1278                                 Shift,
1279                                 Control
1280                         }
1281
1282                         BoxSelect box_select_mode = BoxSelect.None;
1283                         ArrayList prev_selection;
1284                         Point box_select_start;
1285
1286                         Rectangle box_select_rect;
1287                         internal Rectangle BoxSelectRectangle {
1288                                 get { return box_select_rect; }
1289                                 set {
1290                                         if (box_select_rect == value)
1291                                                 return;
1292
1293                                         InvalidateBoxSelectRect ();
1294                                         box_select_rect = value;
1295                                         InvalidateBoxSelectRect ();
1296                                 }
1297                         }
1298
1299                         void InvalidateBoxSelectRect ()
1300                         {
1301                                 if (BoxSelectRectangle.Size.IsEmpty)
1302                                         return;
1303
1304                                 Rectangle edge = BoxSelectRectangle;
1305                                 edge.X -= 1;
1306                                 edge.Y -= 1;
1307                                 edge.Width += 2;
1308                                 edge.Height = 2;
1309                                 Invalidate (edge);
1310                                 edge.Y = BoxSelectRectangle.Bottom - 1;
1311                                 Invalidate (edge);
1312                                 edge.Y = BoxSelectRectangle.Y - 1;
1313                                 edge.Width = 2;
1314                                 edge.Height = BoxSelectRectangle.Height + 2;
1315                                 Invalidate (edge);
1316                                 edge.X = BoxSelectRectangle.Right - 1;
1317                                 Invalidate (edge);
1318                         }
1319
1320                         private Rectangle CalculateBoxSelectRectangle (Point pt)
1321                         {
1322                                 int left = Math.Min (box_select_start.X, pt.X);
1323                                 int right = Math.Max (box_select_start.X, pt.X);
1324                                 int top = Math.Min (box_select_start.Y, pt.Y);
1325                                 int bottom = Math.Max (box_select_start.Y, pt.Y);
1326                                 return Rectangle.FromLTRB (left, top, right, bottom);
1327                         }
1328
1329                         ArrayList BoxSelectedItems {
1330                                 get {
1331                                         ArrayList result = new ArrayList ();
1332                                         foreach (ListViewItem item in owner.Items) {
1333                                                 Rectangle r = item.Bounds;
1334                                                 r.X += r.Width / 4;
1335                                                 r.Y += r.Height / 4;
1336                                                 r.Width /= 2;
1337                                                 r.Height /= 2;
1338                                                 if (BoxSelectRectangle.IntersectsWith (r))
1339                                                         result.Add (item);
1340                                         }
1341                                         return result;
1342                                 }
1343                         }
1344
1345                         private bool PerformBoxSelection (Point pt)
1346                         {
1347                                 if (box_select_mode == BoxSelect.None)
1348                                         return false;
1349
1350                                 BoxSelectRectangle = CalculateBoxSelectRectangle (pt);
1351
1352                                 ArrayList box_items = BoxSelectedItems;
1353
1354                                 ArrayList items;
1355
1356                                 switch (box_select_mode) {
1357
1358                                 case BoxSelect.Normal:
1359                                         items = box_items;
1360                                         break;
1361
1362                                 case BoxSelect.Control:
1363                                         items = new ArrayList ();
1364                                         foreach (ListViewItem item in prev_selection)
1365                                                 if (!box_items.Contains (item))
1366                                                         items.Add (item);
1367                                         foreach (ListViewItem item in box_items)
1368                                                 if (!prev_selection.Contains (item))
1369                                                         items.Add (item);
1370                                         break;
1371
1372                                 case BoxSelect.Shift:
1373                                         items = box_items;
1374                                         foreach (ListViewItem item in box_items)
1375                                                 prev_selection.Remove (item);
1376                                         foreach (ListViewItem item in prev_selection)
1377                                                 items.Add (item);
1378                                         break;
1379
1380                                 default:
1381                                         throw new Exception ("Unexpected Selection mode: " + box_select_mode);
1382                                 }
1383
1384                                 SuspendLayout ();
1385                                 owner.SelectItems (items);
1386                                 ResumeLayout ();
1387
1388                                 return true;
1389                         }
1390
1391                         private void ToggleCheckState (ListViewItem item)
1392                         {
1393                                 CheckState curr_state = item.Checked ?  CheckState.Checked : CheckState.Unchecked;
1394                                 item.Checked = !item.Checked;
1395                                 CheckState new_state = item.Checked ?  CheckState.Checked : CheckState.Unchecked;
1396
1397                                 ItemCheckEventArgs ice = new ItemCheckEventArgs (item.Index, curr_state, new_state);
1398                                 owner.OnItemCheck (ice);
1399                         }
1400
1401                         private void ItemsMouseDown (object sender, MouseEventArgs me)
1402                         {
1403                                 if (owner.items.Count == 0)
1404                                         return;
1405
1406                                 Point pt = new Point (me.X, me.Y);
1407                                 foreach (ListViewItem item in owner.items) {
1408                                         if (me.Clicks == 1 && item.CheckRectReal.Contains (pt)) {
1409                                                 checking = true;
1410                                                 if (me.Clicks > 1)
1411                                                         return;
1412                                                 ToggleCheckState (item);
1413                                                 return;
1414                                         }
1415
1416                                         if (owner.View == View.Details && !owner.FullRowSelect) {
1417                                                 if (item.GetBounds (ItemBoundsPortion.Label).Contains (pt)) {
1418                                                         clicked_item = item;
1419                                                         break;
1420                                                 }
1421                                         } else {
1422                                                 if (item.Bounds.Contains (pt)) {
1423                                                         clicked_item = item;
1424                                                         break;
1425                                                 }
1426                                         }
1427                                 }
1428
1429
1430                                 if (clicked_item != null) {
1431                                         owner.SetFocusedItem (clicked_item);
1432                                         bool changed = !clicked_item.Selected;
1433                                         if (owner.MultiSelect && (XplatUI.State.ModifierKeys & Keys.Control) == 0)
1434                                                 owner.UpdateMultiSelection (clicked_item.Index);
1435                                         else
1436                                                 clicked_item.Selected = true;
1437
1438                                         if (changed)
1439                                                 owner.OnSelectedIndexChanged (EventArgs.Empty);
1440
1441                                         // Raise double click if the item was clicked. On MS the
1442                                         // double click is only raised if you double click an item
1443                                         if (me.Clicks > 1) {
1444                                                 owner.OnDoubleClick (EventArgs.Empty);
1445                                                 if (owner.CheckBoxes)
1446                                                         ToggleCheckState (clicked_item);
1447                                         } else if (me.Clicks == 1)
1448                                                 owner.OnClick (EventArgs.Empty);
1449                                 } else {
1450                                         if (owner.MultiSelect) {
1451                                                 Keys mods = XplatUI.State.ModifierKeys;
1452                                                 if ((mods & Keys.Shift) != 0)
1453                                                         box_select_mode = BoxSelect.Shift;
1454                                                 else if ((mods & Keys.Control) != 0)
1455                                                         box_select_mode = BoxSelect.Control;
1456                                                 else
1457                                                         box_select_mode = BoxSelect.Normal;
1458                                                 box_select_start = pt;
1459                                                 prev_selection = (ArrayList) owner.SelectedItems.list.Clone ();
1460                                         } else if (owner.selected_indices.Count > 0) {
1461                                                 owner.SelectedItems.Clear ();
1462                                                 owner.SelectedIndices.list.Clear ();
1463                                                 owner.OnSelectedIndexChanged (EventArgs.Empty);
1464                                         }
1465                                 }
1466                         }
1467
1468                         private void ItemsMouseMove (object sender, MouseEventArgs me)
1469                         {
1470                                 if (PerformBoxSelection (new Point (me.X, me.Y)))
1471                                         return;
1472
1473                                 if (owner.HoverSelection && hover_processed) {
1474
1475                                         Point pt = PointToClient (Control.MousePosition);
1476                                         ListViewItem item = owner.GetItemAt (pt.X, pt.Y);
1477                                         if (item == null || item.Selected)
1478                                                 return;
1479
1480                                         hover_processed = false;
1481                                         XplatUI.ResetMouseHover (Handle);
1482                                 }
1483                         }
1484
1485
1486                         private void ItemsMouseHover (object sender, EventArgs e)
1487                         {
1488                                 if (Capture || !owner.HoverSelection)
1489                                         return;
1490
1491                                 hover_processed = true;
1492                                 Point pt = PointToClient (Control.MousePosition);
1493                                 ListViewItem item = owner.GetItemAt (pt.X, pt.Y);
1494
1495                                 if (item == null)
1496                                         return;
1497
1498                                 item.Selected = true;
1499                                 owner.OnSelectedIndexChanged (new EventArgs ());
1500                         }
1501
1502                         private void ItemsMouseUp (object sender, MouseEventArgs me)
1503                         {
1504                                 Capture = false;
1505                                 if (owner.Items.Count == 0)
1506                                         return;
1507
1508                                 Point pt = new Point (me.X, me.Y);
1509
1510                                 Rectangle rect = Rectangle.Empty;
1511                                 if (clicked_item != null) {
1512                                         if (owner.view == View.Details && !owner.full_row_select)
1513                                                 rect = clicked_item.GetBounds (ItemBoundsPortion.Label);
1514                                         else
1515                                                 rect = clicked_item.Bounds;
1516
1517                                         if (rect.Contains (pt)) {
1518                                                 switch (owner.activation) {
1519                                                 case ItemActivation.OneClick:
1520                                                         owner.OnItemActivate (EventArgs.Empty);
1521                                                         break;
1522
1523                                                 case ItemActivation.TwoClick:
1524                                                         if (last_clicked_item == clicked_item) {
1525                                                                 owner.OnItemActivate (EventArgs.Empty);
1526                                                                 last_clicked_item = null;
1527                                                         } else
1528                                                                 last_clicked_item = clicked_item;
1529                                                         break;
1530                                                 default:
1531                                                         // DoubleClick activation is handled in another handler
1532                                                         break;
1533                                                 }
1534                                         }
1535                                 } else if (!checking && owner.SelectedItems.Count > 0 && BoxSelectRectangle.Size.IsEmpty) {
1536                                         // Need this to clean up background clicks
1537                                         owner.SelectedItems.Clear ();
1538                                         owner.SelectedIndices.list.Clear ();
1539                                         owner.OnSelectedIndexChanged (EventArgs.Empty);
1540                                 }
1541
1542                                 clicked_item = null;
1543                                 box_select_start = Point.Empty;
1544                                 BoxSelectRectangle = Rectangle.Empty;
1545                                 prev_selection = null;
1546                                 box_select_mode = BoxSelect.None;
1547                                 checking = false;
1548                         }
1549
1550                         private void ItemsMouseWheel (object sender, MouseEventArgs me)
1551                         {
1552                                 if (owner.Items.Count == 0)
1553                                         return;
1554
1555                                 int lines = me.Delta / 120;
1556
1557                                 if (lines == 0)
1558                                         return;
1559
1560                                 switch (owner.View) {
1561                                 case View.Details:
1562                                 case View.SmallIcon:
1563                                         owner.Scroll (owner.v_scroll, -owner.Items [0].Bounds.Height * SystemInformation.MouseWheelScrollLines * lines);
1564                                         break;
1565                                 case View.LargeIcon:
1566                                         owner.Scroll (owner.v_scroll, -(owner.Items [0].Bounds.Height + ThemeEngine.Current.ListViewVerticalSpacing)  * lines);
1567                                         break;
1568                                 case View.List:
1569                                         owner.Scroll (owner.h_scroll, -owner.Items [0].Bounds.Width * lines);
1570                                         break;
1571                                 }
1572                         }
1573
1574                         internal override void OnPaintInternal (PaintEventArgs pe)
1575                         {
1576                                 ThemeEngine.Current.DrawListViewItems (pe.Graphics, pe.ClipRectangle, owner);
1577                         }
1578
1579                         internal override void OnGotFocusInternal (EventArgs e)
1580                         {
1581                                 owner.Focus ();
1582                         }
1583                 }
1584
1585                 internal override void OnPaintInternal (PaintEventArgs pe)
1586                 {
1587                         if (updating)
1588                                 return;
1589
1590                         CalculateScrollBars ();
1591                 }
1592
1593                 void FocusChanged (object o, EventArgs args)
1594                 {
1595                         if (Items.Count == 0)
1596                                 return;
1597
1598                         if (FocusedItem == null)
1599                                 SetFocusedItem (Items [0]);
1600
1601                         item_control.Invalidate (FocusedItem.Bounds);
1602                 }
1603
1604                 private void ListView_SizeChanged (object sender, EventArgs e)
1605                 {
1606                         CalculateListView (alignment);
1607                 }
1608
1609                 private void SetFocusedItem (ListViewItem item)
1610                 {
1611                         if (focused_item != null)
1612                                 focused_item.Focused = false;
1613
1614                         if (item != null)
1615                                 item.Focused = true;
1616
1617                         focused_item = item;
1618                 }
1619
1620                 private void HorizontalScroller (object sender, EventArgs e)
1621                 {
1622                         // Avoid unnecessary flickering, when button is
1623                         // kept pressed at the end
1624                         if (h_marker != h_scroll.Value) {
1625
1626                                 int pixels =  h_marker - h_scroll.Value;
1627
1628                                 h_marker = h_scroll.Value;
1629                                 if (header_control.Visible)
1630                                         XplatUI.ScrollWindow (header_control.Handle, pixels, 0, false);
1631
1632                                 XplatUI.ScrollWindow (item_control.Handle, pixels, 0, false);
1633                         }
1634                 }
1635
1636                 private void VerticalScroller (object sender, EventArgs e)
1637                 {
1638                         // Avoid unnecessary flickering, when button is
1639                         // kept pressed at the end
1640                         if (v_marker != v_scroll.Value) {
1641                                 int pixels =  v_marker - v_scroll.Value;
1642                                 Rectangle area = item_control.ClientRectangle;
1643                                 v_marker = v_scroll.Value;
1644                                 XplatUI.ScrollWindow (item_control.Handle, area, 0, pixels, false);
1645                         }
1646                 }
1647                 #endregion      // Internal Methods Properties
1648
1649                 #region Protected Methods
1650                 protected override void CreateHandle ()
1651                 {
1652                         base.CreateHandle ();
1653                 }
1654
1655                 protected override void Dispose (bool disposing)
1656                 {
1657                         if (disposing) {
1658                                 h_scroll.Dispose ();
1659                                 v_scroll.Dispose ();
1660
1661                                 large_image_list = null;
1662                                 small_image_list = null;
1663                                 state_image_list = null;
1664                         }
1665
1666                         base.Dispose (disposing);
1667                 }
1668
1669                 protected override bool IsInputKey (Keys keyData)
1670                 {
1671                         switch (keyData) {
1672                         case Keys.Up:
1673                         case Keys.Down:
1674                         case Keys.PageUp:
1675                         case Keys.PageDown:
1676                         case Keys.Right:
1677                         case Keys.Left:
1678                         case Keys.End:
1679                         case Keys.Home:
1680                                 return true;
1681
1682                         default:
1683                                 break;
1684                         }
1685
1686                         return base.IsInputKey (keyData);
1687                 }
1688
1689                 protected virtual void OnAfterLabelEdit (LabelEditEventArgs e)
1690                 {
1691                         if (AfterLabelEdit != null)
1692                                 AfterLabelEdit (this, e);
1693                 }
1694
1695                 protected virtual void OnBeforeLabelEdit (LabelEditEventArgs e)
1696                 {
1697                         if (BeforeLabelEdit != null)
1698                                 BeforeLabelEdit (this, e);
1699                 }
1700
1701                 protected virtual void OnColumnClick (ColumnClickEventArgs e)
1702                 {
1703                         if (ColumnClick != null)
1704                                 ColumnClick (this, e);
1705                 }
1706
1707                 protected override void OnEnabledChanged (EventArgs e)
1708                 {
1709                         base.OnEnabledChanged (e);
1710                 }
1711
1712                 protected override void OnFontChanged (EventArgs e)
1713                 {
1714                         base.OnFontChanged (e);
1715                         Redraw (true);
1716                 }
1717
1718                 protected override void OnHandleCreated (EventArgs e)
1719                 {
1720                         base.OnHandleCreated (e);
1721                 }
1722
1723                 protected override void OnHandleDestroyed (EventArgs e)
1724                 {
1725                         base.OnHandleDestroyed (e);
1726                 }
1727
1728                 protected virtual void OnItemActivate (EventArgs e)
1729                 {
1730                         if (ItemActivate != null)
1731                                 ItemActivate (this, e);
1732                 }
1733
1734                 protected virtual void OnItemCheck (ItemCheckEventArgs ice)
1735                 {
1736                         if (ItemCheck != null)
1737                                 ItemCheck (this, ice);
1738                 }
1739
1740                 protected virtual void OnItemDrag (ItemDragEventArgs e)
1741                 {
1742                         if (ItemDrag != null)
1743                                 ItemDrag (this, e);
1744                 }
1745
1746                 protected virtual void OnSelectedIndexChanged (EventArgs e)
1747                 {
1748                         if (SelectedIndexChanged != null)
1749                                 SelectedIndexChanged (this, e);
1750                 }
1751
1752                 protected override void OnSystemColorsChanged (EventArgs e)
1753                 {
1754                         base.OnSystemColorsChanged (e);
1755                 }
1756
1757                 protected void RealizeProperties ()
1758                 {
1759                         // FIXME: TODO
1760                 }
1761
1762                 protected void UpdateExtendedStyles ()
1763                 {
1764                         // FIXME: TODO
1765                 }
1766
1767                 protected override void WndProc (ref Message m)
1768                 {
1769                         base.WndProc (ref m);
1770                 }
1771                 #endregion // Protected Methods
1772
1773                 #region Public Instance Methods
1774                 public void ArrangeIcons ()
1775                 {
1776                         ArrangeIcons (this.alignment);
1777                 }
1778
1779                 public void ArrangeIcons (ListViewAlignment alignment)
1780                 {
1781                         // Icons are arranged only if view is set to LargeIcon or SmallIcon
1782                         if (view == View.LargeIcon || view == View.SmallIcon) {
1783                                 this.CalculateListView (alignment);
1784                                 // we have done the calculations already
1785                                 this.Redraw (false);
1786                         }
1787                 }
1788
1789                 public void BeginUpdate ()
1790                 {
1791                         // flag to avoid painting
1792                         updating = true;
1793                 }
1794
1795                 public void Clear ()
1796                 {
1797                         columns.Clear ();
1798                         items.Clear (); // Redraw (true) called here
1799                 }
1800
1801                 public void EndUpdate ()
1802                 {
1803                         // flag to avoid painting
1804                         updating = false;
1805
1806                         // probably, now we need a redraw with recalculations
1807                         this.Redraw (true);
1808                 }
1809
1810                 public void EnsureVisible (int index)
1811                 {
1812                         if (index < 0 || index >= items.Count || scrollable == false)
1813                                 return;
1814
1815                         Rectangle view_rect = item_control.ClientRectangle;
1816                         Rectangle bounds = items [index].Bounds;
1817
1818                         if (view_rect.Contains (bounds))
1819                                 return;
1820
1821                         if (bounds.Left < 0)
1822                                 h_scroll.Value += bounds.Left;
1823                         else if (bounds.Right > view_rect.Right)
1824                                 h_scroll.Value += (bounds.Right - view_rect.Right);
1825
1826                         if (bounds.Top < 0)
1827                                 v_scroll.Value += bounds.Top;
1828                         else if (bounds.Bottom > view_rect.Bottom)
1829                                 v_scroll.Value += (bounds.Bottom - view_rect.Bottom);
1830                 }
1831
1832                 public ListViewItem GetItemAt (int x, int y)
1833                 {
1834                         foreach (ListViewItem item in items) {
1835                                 if (item.Bounds.Contains (x, y))
1836                                         return item;
1837                         }
1838                         return null;
1839                 }
1840
1841                 public Rectangle GetItemRect (int index)
1842                 {
1843                         return GetItemRect (index, ItemBoundsPortion.Entire);
1844                 }
1845
1846                 public Rectangle GetItemRect (int index, ItemBoundsPortion portion)
1847                 {
1848                         if (index < 0 || index >= items.Count)
1849                                 throw new IndexOutOfRangeException ("index");
1850
1851                         return items [index].GetBounds (portion);
1852                 }
1853
1854                 public void Sort ()
1855                 {
1856                         if (sort_order != SortOrder.None)
1857                                 items.list.Sort (item_sorter);
1858
1859                         if (sort_order == SortOrder.Descending)
1860                                 items.list.Reverse ();
1861
1862                         this.Redraw (true);
1863                 }
1864
1865                 public override string ToString ()
1866                 {
1867                         int count = this.Items.Count;
1868
1869                         if (count == 0)
1870                                 return string.Format ("System.Windows.Forms.ListView, Items.Count: 0");
1871                         else
1872                                 return string.Format ("System.Windows.Forms.ListView, Items.Count: {0}, Items[0]: {1}", count, this.Items [0].ToString ());
1873                 }
1874                 #endregion      // Public Instance Methods
1875
1876
1877                 #region Subclasses
1878
1879                 class HeaderControl : Control {
1880
1881                         ListView owner;
1882                         bool column_resize_active = false;
1883                         ColumnHeader resize_column;
1884                         ColumnHeader clicked_column;
1885                         ColumnHeader drag_column;
1886                         int drag_x;
1887                         int drag_to_index = -1;
1888
1889                         public HeaderControl (ListView owner)
1890                         {
1891                                 this.owner = owner;
1892                                 MouseDown += new MouseEventHandler (HeaderMouseDown);
1893                                 MouseMove += new MouseEventHandler (HeaderMouseMove);
1894                                 MouseUp += new MouseEventHandler (HeaderMouseUp);
1895                         }
1896
1897                         private ColumnHeader ColumnAtX (int x)
1898                         {
1899                                 Point pt = new Point (x, 0);
1900                                 ColumnHeader result = null;
1901                                 foreach (ColumnHeader col in owner.Columns) {
1902                                         if (col.Rect.Contains (pt)) {
1903                                                 result = col;
1904                                                 break;
1905                                         }
1906                                 }
1907                                 return result;
1908                         }
1909
1910                         private int GetReorderedIndex (ColumnHeader col)
1911                         {
1912                                 if (owner.reordered_column_indices == null)
1913                                         return col.Index;
1914                                 else
1915                                         for (int i = 0; i < owner.Columns.Count; i++)
1916                                                 if (owner.reordered_column_indices [i] == col.Index)
1917                                                         return i;
1918                                 throw new Exception ("Column index missing from reordered array");
1919                         }
1920
1921                         private void HeaderMouseDown (object sender, MouseEventArgs me)
1922                         {
1923                                 if (resize_column != null) {
1924                                         column_resize_active = true;
1925                                         Capture = true;
1926                                         return;
1927                                 }
1928
1929                                 clicked_column = ColumnAtX (me.X + owner.h_marker);
1930
1931                                 if (clicked_column != null) {
1932                                         Capture = true;
1933                                         if (owner.AllowColumnReorder) {
1934                                                 drag_x = me.X;
1935                                                 drag_column = (ColumnHeader) (clicked_column as ICloneable).Clone ();
1936                                                 drag_column.column_rect = clicked_column.Rect;
1937                                                 drag_to_index = GetReorderedIndex (clicked_column);
1938                                         }
1939                                         clicked_column.pressed = true;
1940                                         Rectangle bounds = clicked_column.Rect;
1941                                         bounds.X -= owner.h_marker;
1942                                         Invalidate (bounds);
1943                                         return;
1944                                 }
1945                         }
1946
1947                         private void HeaderMouseMove (object sender, MouseEventArgs me)
1948                         {
1949                                 Point pt = new Point (me.X + owner.h_marker, me.Y);
1950
1951                                 if (column_resize_active)  {
1952                                         resize_column.Width = pt.X - resize_column.X;
1953                                         if (resize_column.Width < 0)
1954                                                 resize_column.Width = 0;
1955                                         return;
1956                                 }
1957
1958                                 resize_column = null;
1959
1960                                 if (clicked_column != null) {
1961                                         if (owner.AllowColumnReorder) {
1962                                                 Rectangle r;
1963
1964                                                 r = drag_column.column_rect;
1965                                                 r.X = clicked_column.Rect.X + me.X - drag_x;
1966                                                 drag_column.column_rect = r;
1967
1968                                                 int x = me.X + owner.h_marker;
1969                                                 ColumnHeader over = ColumnAtX (x);
1970                                                 if (over == null)
1971                                                         drag_to_index = owner.Columns.Count;
1972                                                 else if (x < over.X + over.Width / 2)
1973                                                         drag_to_index = GetReorderedIndex (over);
1974                                                 else
1975                                                         drag_to_index = GetReorderedIndex (over) + 1;
1976                                                 Invalidate ();
1977                                         } else {
1978                                                 ColumnHeader over = ColumnAtX (me.X + owner.h_marker);
1979                                                 bool pressed = clicked_column.pressed;
1980                                                 clicked_column.pressed = over == clicked_column;
1981                                                 if (clicked_column.pressed ^ pressed) {
1982                                                         Rectangle bounds = clicked_column.Rect;
1983                                                         bounds.X -= owner.h_marker;
1984                                                         Invalidate (bounds);
1985                                                 }
1986                                         }
1987                                         return;
1988                                 }
1989
1990                                 for (int i = 0; i < owner.Columns.Count; i++) {
1991                                         Rectangle zone = owner.Columns [i].Rect;
1992                                         zone.X = zone.Right - 5;
1993                                         zone.Width = 10;
1994                                         if (zone.Contains (pt)) {
1995                                                 if (i < owner.Columns.Count - 1 && owner.Columns [i + 1].Width == 0)
1996                                                         i++;
1997                                                 resize_column = owner.Columns [i];
1998                                                 break;
1999                                         }
2000                                 }
2001
2002                                 if (resize_column == null)
2003                                         Cursor = Cursors.Default;
2004                                 else
2005                                         Cursor = Cursors.VSplit;
2006                         }
2007
2008                         void HeaderMouseUp (object sender, MouseEventArgs me)
2009                         {
2010                                 Capture = false;
2011
2012                                 if (column_resize_active) {
2013                                         column_resize_active = false;
2014                                         resize_column = null;
2015                                         Cursor = Cursors.Default;
2016                                         return;
2017                                 }
2018
2019                                 if (clicked_column != null && clicked_column.pressed) {
2020                                         clicked_column.pressed = false;
2021                                         Rectangle bounds = clicked_column.Rect;
2022                                         bounds.X -= owner.h_marker;
2023                                         Invalidate (bounds);
2024                                         owner.OnColumnClick (new ColumnClickEventArgs (clicked_column.Index));
2025                                 }
2026
2027                                 if (drag_column != null && owner.AllowColumnReorder) {
2028                                         drag_column = null;
2029                                         if (drag_to_index > GetReorderedIndex (clicked_column))
2030                                                 drag_to_index--;
2031                                         if (owner.GetReorderedColumn (drag_to_index) != clicked_column)
2032                                                 owner.ReorderColumn (clicked_column, drag_to_index);
2033                                         drag_to_index = -1;
2034                                         Invalidate ();
2035                                 }
2036
2037                                 clicked_column = null;
2038                         }
2039
2040                         internal override void OnPaintInternal (PaintEventArgs pe)
2041                         {
2042                                 if (owner.updating)
2043                                         return;
2044
2045                                 Theme theme = ThemeEngine.Current;
2046                                 theme.DrawListViewHeader (pe.Graphics, pe.ClipRectangle, this.owner);
2047
2048                                 if (drag_column == null)
2049                                         return;
2050
2051                                 int target_x;
2052                                 if (drag_to_index == owner.Columns.Count)
2053                                         target_x = owner.GetReorderedColumn (drag_to_index - 1).Rect.Right - owner.h_marker;
2054                                 else
2055                                         target_x = owner.GetReorderedColumn (drag_to_index).Rect.X - owner.h_marker;
2056                                 theme.DrawListViewHeaderDragDetails (pe.Graphics, owner, drag_column, target_x);
2057                         }
2058
2059                         protected override void WndProc (ref Message m)
2060                         {
2061                                 switch ((Msg)m.Msg) {
2062                                 case Msg.WM_SETFOCUS:
2063                                         owner.Focus ();
2064                                         break;
2065                                 default:
2066                                         base.WndProc (ref m);
2067                                         break;
2068                                 }
2069                         }
2070                 }
2071
2072                 private class ItemComparer : IComparer {
2073
2074                         public int Compare (object x, object y)
2075                         {
2076                                 ListViewItem item_x = x as ListViewItem;
2077                                 ListViewItem item_y = y as ListViewItem;
2078                                 return String.Compare (item_x.Text, item_y.Text);
2079                         }
2080                 }
2081
2082                 public class CheckedIndexCollection : IList, ICollection, IEnumerable
2083                 {
2084                         internal ArrayList list;
2085                         private ListView owner;
2086
2087                         #region Public Constructor
2088                         public CheckedIndexCollection (ListView owner)
2089                         {
2090                                 list = new ArrayList ();
2091                                 this.owner = owner;
2092                         }
2093                         #endregion      // Public Constructor
2094
2095                         #region Public Properties
2096                         [Browsable (false)]
2097                         public int Count {
2098                                 get { return list.Count; }
2099                         }
2100
2101                         public bool IsReadOnly {
2102                                 get { return true; }
2103                         }
2104
2105                         public int this [int index] {
2106                                 get {
2107                                         if (index < 0 || index >= list.Count)
2108                                                 throw new ArgumentOutOfRangeException ("index");
2109                                         return (int) list [index];
2110                                 }
2111                         }
2112
2113                         bool ICollection.IsSynchronized {
2114                                 get { return false; }
2115                         }
2116
2117                         object ICollection.SyncRoot {
2118                                 get { return this; }
2119                         }
2120
2121                         bool IList.IsFixedSize {
2122                                 get { return true; }
2123                         }
2124
2125                         object IList.this [int index] {
2126                                 get { return this [index]; }
2127                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2128                         }
2129                         #endregion      // Public Properties
2130
2131                         #region Public Methods
2132                         public bool Contains (int checkedIndex)
2133                         {
2134                                 return list.Contains (checkedIndex);
2135                         }
2136
2137                         public IEnumerator GetEnumerator ()
2138                         {
2139                                 return list.GetEnumerator ();
2140                         }
2141
2142                         void ICollection.CopyTo (Array dest, int index)
2143                         {
2144                                 list.CopyTo (dest, index);
2145                         }
2146
2147                         int IList.Add (object value)
2148                         {
2149                                 throw new NotSupportedException ("Add operation is not supported.");
2150                         }
2151
2152                         void IList.Clear ()
2153                         {
2154                                 throw new NotSupportedException ("Clear operation is not supported.");
2155                         }
2156
2157                         bool IList.Contains (object checkedIndex)
2158                         {
2159                                 return list.Contains (checkedIndex);
2160                         }
2161
2162                         int IList.IndexOf (object checkedIndex)
2163                         {
2164                                 return list.IndexOf (checkedIndex);
2165                         }
2166
2167                         void IList.Insert (int index, object value)
2168                         {
2169                                 throw new NotSupportedException ("Insert operation is not supported.");
2170                         }
2171
2172                         void IList.Remove (object value)
2173                         {
2174                                 throw new NotSupportedException ("Remove operation is not supported.");
2175                         }
2176
2177                         void IList.RemoveAt (int index)
2178                         {
2179                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2180                         }
2181
2182                         public int IndexOf (int checkedIndex)
2183                         {
2184                                 return list.IndexOf (checkedIndex);
2185                         }
2186                         #endregion      // Public Methods
2187
2188                 }       // CheckedIndexCollection
2189
2190                 public class CheckedListViewItemCollection : IList, ICollection, IEnumerable
2191                 {
2192                         internal ArrayList list;
2193                         private ListView owner;
2194
2195                         #region Public Constructor
2196                         public CheckedListViewItemCollection (ListView owner)
2197                         {
2198                                 list = new ArrayList ();
2199                                 this.owner = owner;
2200                         }
2201                         #endregion      // Public Constructor
2202
2203                         #region Public Properties
2204                         [Browsable (false)]
2205                         public int Count {
2206                                 get { return list.Count; }
2207                         }
2208
2209                         public bool IsReadOnly {
2210                                 get { return true; }
2211                         }
2212
2213                         public ListViewItem this [int index] {
2214                                 get {
2215                                         if (index < 0 || index >= list.Count)
2216                                                 throw new ArgumentOutOfRangeException ("index");
2217                                         return (ListViewItem) list [index];
2218                                 }
2219                         }
2220
2221                         bool ICollection.IsSynchronized {
2222                                 get { return list.IsSynchronized; }
2223                         }
2224
2225                         object ICollection.SyncRoot {
2226                                 get { return this; }
2227                         }
2228
2229                         bool IList.IsFixedSize {
2230                                 get { return true; }
2231                         }
2232
2233                         object IList.this [int index] {
2234                                 get { return this [index]; }
2235                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2236                         }
2237                         #endregion      // Public Properties
2238
2239                         #region Public Methods
2240                         public bool Contains (ListViewItem item)
2241                         {
2242                                 return list.Contains (item);
2243                         }
2244
2245                         public void CopyTo (Array dest, int index)
2246                         {
2247                                 list.CopyTo (dest, index);
2248                         }
2249
2250                         public IEnumerator GetEnumerator ()
2251                         {
2252                                 return list.GetEnumerator ();
2253                         }
2254
2255                         int IList.Add (object value)
2256                         {
2257                                 throw new NotSupportedException ("Add operation is not supported.");
2258                         }
2259
2260                         void IList.Clear ()
2261                         {
2262                                 throw new NotSupportedException ("Clear operation is not supported.");
2263                         }
2264
2265                         bool IList.Contains (object item)
2266                         {
2267                                 return list.Contains (item);
2268                         }
2269
2270                         int IList.IndexOf (object item)
2271                         {
2272                                 return list.IndexOf (item);
2273                         }
2274
2275                         void IList.Insert (int index, object value)
2276                         {
2277                                 throw new NotSupportedException ("Insert operation is not supported.");
2278                         }
2279
2280                         void IList.Remove (object value)
2281                         {
2282                                 throw new NotSupportedException ("Remove operation is not supported.");
2283                         }
2284
2285                         void IList.RemoveAt (int index)
2286                         {
2287                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2288                         }
2289
2290                         public int IndexOf (ListViewItem item)
2291                         {
2292                                 return list.IndexOf (item);
2293                         }
2294                         #endregion      // Public Methods
2295
2296                 }       // CheckedListViewItemCollection
2297
2298                 public class ColumnHeaderCollection : IList, ICollection, IEnumerable
2299                 {
2300                         internal ArrayList list;
2301                         private ListView owner;
2302
2303                         #region Public Constructor
2304                         public ColumnHeaderCollection (ListView owner)
2305                         {
2306                                 list = new ArrayList ();
2307                                 this.owner = owner;
2308                         }
2309                         #endregion      // Public Constructor
2310
2311                         #region Public Properties
2312                         [Browsable (false)]
2313                         public int Count {
2314                                 get { return list.Count; }
2315                         }
2316
2317                         public bool IsReadOnly {
2318                                 get { return false; }
2319                         }
2320
2321                         public virtual ColumnHeader this [int index] {
2322                                 get {
2323                                         if (index < 0 || index >= list.Count)
2324                                                 throw new ArgumentOutOfRangeException ("index");
2325                                         return (ColumnHeader) list [index];
2326                                 }
2327                         }
2328
2329                         bool ICollection.IsSynchronized {
2330                                 get { return true; }
2331                         }
2332
2333                         object ICollection.SyncRoot {
2334                                 get { return this; }
2335                         }
2336
2337                         bool IList.IsFixedSize {
2338                                 get { return list.IsFixedSize; }
2339                         }
2340
2341                         object IList.this [int index] {
2342                                 get { return this [index]; }
2343                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2344                         }
2345                         #endregion      // Public Properties
2346
2347                         #region Public Methods
2348                         public virtual int Add (ColumnHeader value)
2349                         {
2350                                 int idx;
2351                                 value.owner = this.owner;
2352                                 idx = list.Add (value);
2353                                 if (owner.IsHandleCreated) {
2354                                         owner.Redraw (true);
2355                                 }
2356                                 return idx;
2357                         }
2358
2359                         public virtual ColumnHeader Add (string str, int width, HorizontalAlignment textAlign)
2360                         {
2361                                 ColumnHeader colHeader = new ColumnHeader (this.owner, str, textAlign, width);
2362                                 this.Add (colHeader);
2363                                 return colHeader;
2364                         }
2365
2366                         public virtual void AddRange (ColumnHeader [] values)
2367                         {
2368                                 foreach (ColumnHeader colHeader in values) {
2369                                         colHeader.owner = this.owner;
2370                                         Add (colHeader);
2371                                 }
2372
2373                                 owner.Redraw (true);
2374                         }
2375
2376                         public virtual void Clear ()
2377                         {
2378                                 list.Clear ();
2379                                 owner.Redraw (true);
2380                         }
2381
2382                         public bool Contains (ColumnHeader value)
2383                         {
2384                                 return list.Contains (value);
2385                         }
2386
2387                         public IEnumerator GetEnumerator ()
2388                         {
2389                                 return list.GetEnumerator ();
2390                         }
2391
2392                         void ICollection.CopyTo (Array dest, int index)
2393                         {
2394                                 list.CopyTo (dest, index);
2395                         }
2396
2397                         int IList.Add (object value)
2398                         {
2399                                 if (! (value is ColumnHeader)) {
2400                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2401                                 }
2402
2403                                 return this.Add ((ColumnHeader) value);
2404                         }
2405
2406                         bool IList.Contains (object value)
2407                         {
2408                                 if (! (value is ColumnHeader)) {
2409                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2410                                 }
2411
2412                                 return this.Contains ((ColumnHeader) value);
2413                         }
2414
2415                         int IList.IndexOf (object value)
2416                         {
2417                                 if (! (value is ColumnHeader)) {
2418                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2419                                 }
2420
2421                                 return this.IndexOf ((ColumnHeader) value);
2422                         }
2423
2424                         void IList.Insert (int index, object value)
2425                         {
2426                                 if (! (value is ColumnHeader)) {
2427                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2428                                 }
2429
2430                                 this.Insert (index, (ColumnHeader) value);
2431                         }
2432
2433                         void IList.Remove (object value)
2434                         {
2435                                 if (! (value is ColumnHeader)) {
2436                                         throw new ArgumentException ("Not of type ColumnHeader", "value");
2437                                 }
2438
2439                                 this.Remove ((ColumnHeader) value);
2440                         }
2441
2442                         public int IndexOf (ColumnHeader value)
2443                         {
2444                                 return list.IndexOf (value);
2445                         }
2446
2447                         public void Insert (int index, ColumnHeader value)
2448                         {
2449                                 // LAMESPEC: MSDOCS say greater than or equal to the value of the Count property
2450                                 // but it's really only greater.
2451                                 if (index < 0 || index > list.Count)
2452                                         throw new ArgumentOutOfRangeException ("index");
2453
2454                                 value.owner = this.owner;
2455                                 list.Insert (index, value);
2456                                 owner.Redraw (true);
2457                         }
2458
2459                         public void Insert (int index, string str, int width, HorizontalAlignment textAlign)
2460                         {
2461                                 ColumnHeader colHeader = new ColumnHeader (this.owner, str, textAlign, width);
2462                                 this.Insert (index, colHeader);
2463                         }
2464
2465                         public virtual void Remove (ColumnHeader column)
2466                         {
2467                                 // TODO: Update Column internal index ?
2468                                 list.Remove (column);
2469                                 owner.Redraw (true);
2470                         }
2471
2472                         public virtual void RemoveAt (int index)
2473                         {
2474                                 if (index < 0 || index >= list.Count)
2475                                         throw new ArgumentOutOfRangeException ("index");
2476
2477                                 // TODO: Update Column internal index ?
2478                                 list.RemoveAt (index);
2479                                 owner.Redraw (true);
2480                         }
2481                         #endregion      // Public Methods
2482
2483
2484                 }       // ColumnHeaderCollection
2485
2486                 public class ListViewItemCollection : IList, ICollection, IEnumerable
2487                 {
2488                         internal ArrayList list;
2489                         private ListView owner;
2490
2491                         #region Public Constructor
2492                         public ListViewItemCollection (ListView owner)
2493                         {
2494                                 list = new ArrayList ();
2495                                 this.owner = owner;
2496                         }
2497                         #endregion      // Public Constructor
2498
2499                         #region Public Properties
2500                         [Browsable (false)]
2501                         public int Count {
2502                                 get { return list.Count; }
2503                         }
2504
2505                         public bool IsReadOnly {
2506                                 get { return false; }
2507                         }
2508
2509                         public virtual ListViewItem this [int displayIndex] {
2510                                 get {
2511                                         if (displayIndex < 0 || displayIndex >= list.Count)
2512                                                 throw new ArgumentOutOfRangeException ("displayIndex");
2513                                         return (ListViewItem) list [displayIndex];
2514                                 }
2515
2516                                 set {
2517                                         if (displayIndex < 0 || displayIndex >= list.Count)
2518                                                 throw new ArgumentOutOfRangeException ("displayIndex");
2519
2520                                         if (list.Contains (value))
2521                                                 throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "value");
2522
2523                                         value.Owner = owner;
2524                                         list [displayIndex] = value;
2525
2526                                         owner.Redraw (true);
2527                                 }
2528                         }
2529
2530                         bool ICollection.IsSynchronized {
2531                                 get { return true; }
2532                         }
2533
2534                         object ICollection.SyncRoot {
2535                                 get { return this; }
2536                         }
2537
2538                         bool IList.IsFixedSize {
2539                                 get { return list.IsFixedSize; }
2540                         }
2541
2542                         object IList.this [int index] {
2543                                 get { return this [index]; }
2544                                 set {
2545                                         if (value is ListViewItem)
2546                                                 this [index] = (ListViewItem) value;
2547                                         else
2548                                                 this [index] = new ListViewItem (value.ToString ());
2549                                 }
2550                         }
2551                         #endregion      // Public Properties
2552
2553                         #region Public Methods
2554                         public virtual ListViewItem Add (ListViewItem value)
2555                         {
2556                                 if (list.Contains (value))
2557                                         throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "value");
2558
2559                                 value.Owner = owner;
2560                                 list.Add (value);
2561
2562                                 if (owner.Sorting != SortOrder.None)
2563                                         owner.Sort ();
2564
2565                                 owner.Redraw (true);
2566
2567                                 return value;
2568                         }
2569
2570                         public virtual ListViewItem Add (string text)
2571                         {
2572                                 ListViewItem item = new ListViewItem (text);
2573                                 return this.Add (item);
2574                         }
2575
2576                         public virtual ListViewItem Add (string text, int imageIndex)
2577                         {
2578                                 ListViewItem item = new ListViewItem (text, imageIndex);
2579                                 return this.Add (item);
2580                         }
2581
2582                         public void AddRange (ListViewItem [] values)
2583                         {
2584                                 list.Clear ();
2585                                 owner.SelectedItems.list.Clear ();
2586                                 owner.SelectedIndices.list.Clear ();
2587                                 owner.CheckedItems.list.Clear ();
2588                                 owner.CheckedIndices.list.Clear ();
2589
2590                                 foreach (ListViewItem item in values) {
2591                                         item.Owner = owner;
2592                                         list.Add (item);
2593                                 }
2594
2595                                 if (owner.Sorting != SortOrder.None)
2596                                         owner.Sort ();
2597
2598                                 owner.Redraw (true);
2599                         }
2600
2601                         public virtual void Clear ()
2602                         {
2603                                 owner.SetFocusedItem (null);
2604                                 owner.h_scroll.Value = owner.v_scroll.Value = 0;
2605                                 list.Clear ();
2606                                 owner.SelectedItems.list.Clear ();
2607                                 owner.SelectedIndices.list.Clear ();
2608                                 owner.CheckedItems.list.Clear ();
2609                                 owner.CheckedIndices.list.Clear ();
2610                                 owner.Redraw (true);
2611                         }
2612
2613                         public bool Contains (ListViewItem item)
2614                         {
2615                                 return list.Contains (item);
2616                         }
2617
2618                         public void CopyTo (Array dest, int index)
2619                         {
2620                                 list.CopyTo (dest, index);
2621                         }
2622
2623                         public IEnumerator GetEnumerator ()
2624                         {
2625                                 return list.GetEnumerator ();
2626                         }
2627
2628                         int IList.Add (object item)
2629                         {
2630                                 int result;
2631                                 ListViewItem li;
2632
2633                                 if (item is ListViewItem) {
2634                                         li = (ListViewItem) item;
2635                                         if (list.Contains (li))
2636                                                 throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "item");
2637                                 }
2638                                 else
2639                                         li = new ListViewItem (item.ToString ());
2640
2641                                 li.Owner = owner;
2642                                 result = list.Add (li);
2643                                 owner.Redraw (true);
2644
2645                                 return result;
2646                         }
2647
2648                         bool IList.Contains (object item)
2649                         {
2650                                 return list.Contains (item);
2651                         }
2652
2653                         int IList.IndexOf (object item)
2654                         {
2655                                 return list.IndexOf (item);
2656                         }
2657
2658                         void IList.Insert (int index, object item)
2659                         {
2660                                 if (item is ListViewItem)
2661                                         this.Insert (index, (ListViewItem) item);
2662                                 else
2663                                         this.Insert (index, item.ToString ());
2664                         }
2665
2666                         void IList.Remove (object item)
2667                         {
2668                                 Remove ((ListViewItem) item);
2669                         }
2670
2671                         public int IndexOf (ListViewItem item)
2672                         {
2673                                 return list.IndexOf (item);
2674                         }
2675
2676                         public ListViewItem Insert (int index, ListViewItem item)
2677                         {
2678                                 // LAMESPEC: MSDOCS say greater than or equal to the value of the Count property
2679                                 // but it's really only greater.
2680                                 if (index < 0 || index > list.Count)
2681                                         throw new ArgumentOutOfRangeException ("index");
2682
2683                                 if (list.Contains (item))
2684                                         throw new ArgumentException ("An item cannot be added more than once. To add an item again, you need to clone it.", "item");
2685
2686                                 item.Owner = owner;
2687                                 list.Insert (index, item);
2688                                 owner.Redraw (true);
2689                                 return item;
2690                         }
2691
2692                         public ListViewItem Insert (int index, string text)
2693                         {
2694                                 return this.Insert (index, new ListViewItem (text));
2695                         }
2696
2697                         public ListViewItem Insert (int index, string text, int imageIndex)
2698                         {
2699                                 return this.Insert (index, new ListViewItem (text, imageIndex));
2700                         }
2701
2702                         public virtual void Remove (ListViewItem item)
2703                         {
2704                                 if (!list.Contains (item))
2705                                         return;
2706
2707                                 owner.SelectedItems.list.Remove (item);
2708                                 owner.SelectedIndices.list.Remove (item.Index);
2709                                 owner.CheckedItems.list.Remove (item);
2710                                 owner.CheckedIndices.list.Remove (item.Index);
2711                                 list.Remove (item);
2712                                 owner.Redraw (true);
2713                         }
2714
2715                         public virtual void RemoveAt (int index)
2716                         {
2717                                 if (index < 0 || index >= list.Count)
2718                                         throw new ArgumentOutOfRangeException ("index");
2719
2720                                 list.RemoveAt (index);
2721                                 owner.SelectedItems.list.RemoveAt (index);
2722                                 owner.SelectedIndices.list.RemoveAt (index);
2723                                 owner.CheckedItems.list.RemoveAt (index);
2724                                 owner.CheckedIndices.list.RemoveAt (index);
2725                                 owner.Redraw (false);
2726                         }
2727                         #endregion      // Public Methods
2728
2729                 }       // ListViewItemCollection
2730
2731                 public class SelectedIndexCollection : IList, ICollection, IEnumerable
2732                 {
2733                         internal ArrayList list;
2734                         private ListView owner;
2735
2736                         #region Public Constructor
2737                         public SelectedIndexCollection (ListView owner)
2738                         {
2739                                 list = new ArrayList ();
2740                                 this.owner = owner;
2741                         }
2742                         #endregion      // Public Constructor
2743
2744                         #region Public Properties
2745                         [Browsable (false)]
2746                         public int Count {
2747                                 get { return list.Count; }
2748                         }
2749
2750                         public bool IsReadOnly {
2751                                 get { return true; }
2752                         }
2753
2754                         public int this [int index] {
2755                                 get {
2756                                         if (index < 0 || index >= list.Count)
2757                                                 throw new ArgumentOutOfRangeException ("index");
2758                                         return (int) list [index];
2759                                 }
2760                         }
2761
2762                         bool ICollection.IsSynchronized {
2763                                 get { return list.IsSynchronized; }
2764                         }
2765
2766                         object ICollection.SyncRoot {
2767                                 get { return this; }
2768                         }
2769
2770                         bool IList.IsFixedSize {
2771                                 get { return true; }
2772                         }
2773
2774                         object IList.this [int index] {
2775                                 get { return this [index]; }
2776                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2777                         }
2778                         #endregion      // Public Properties
2779
2780                         #region Public Methods
2781                         public bool Contains (int selectedIndex)
2782                         {
2783                                 return list.Contains (selectedIndex);
2784                         }
2785
2786                         public void CopyTo (Array dest, int index)
2787                         {
2788                                 list.CopyTo (dest, index);
2789                         }
2790
2791                         public IEnumerator GetEnumerator ()
2792                         {
2793                                 return list.GetEnumerator ();
2794                         }
2795
2796                         int IList.Add (object value)
2797                         {
2798                                 throw new NotSupportedException ("Add operation is not supported.");
2799                         }
2800
2801                         void IList.Clear ()
2802                         {
2803                                 throw new NotSupportedException ("Clear operation is not supported.");
2804                         }
2805
2806                         bool IList.Contains (object selectedIndex)
2807                         {
2808                                 return list.Contains (selectedIndex);
2809                         }
2810
2811                         int IList.IndexOf (object selectedIndex)
2812                         {
2813                                 return list.IndexOf (selectedIndex);
2814                         }
2815
2816                         void IList.Insert (int index, object value)
2817                         {
2818                                 throw new NotSupportedException ("Insert operation is not supported.");
2819                         }
2820
2821                         void IList.Remove (object value)
2822                         {
2823                                 throw new NotSupportedException ("Remove operation is not supported.");
2824                         }
2825
2826                         void IList.RemoveAt (int index)
2827                         {
2828                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2829                         }
2830
2831                         public int IndexOf (int selectedIndex)
2832                         {
2833                                 return list.IndexOf (selectedIndex);
2834                         }
2835                         #endregion      // Public Methods
2836
2837                 }       // SelectedIndexCollection
2838
2839                 public class SelectedListViewItemCollection : IList, ICollection, IEnumerable
2840                 {
2841                         internal ArrayList list;
2842                         private ListView owner;
2843
2844                         #region Public Constructor
2845                         public SelectedListViewItemCollection (ListView owner)
2846                         {
2847                                 list = new ArrayList ();
2848                                 this.owner = owner;
2849                         }
2850                         #endregion      // Public Constructor
2851
2852                         #region Public Properties
2853                         [Browsable (false)]
2854                         public int Count {
2855                                 get { return list.Count; }
2856                         }
2857
2858                         public bool IsReadOnly {
2859                                 get { return true; }
2860                         }
2861
2862                         public ListViewItem this [int index] {
2863                                 get {
2864                                         if (index < 0 || index >= list.Count)
2865                                                 throw new ArgumentOutOfRangeException ("index");
2866                                         return (ListViewItem) list [index];
2867                                 }
2868                         }
2869
2870                         bool ICollection.IsSynchronized {
2871                                 get { return list.IsSynchronized; }
2872                         }
2873
2874                         object ICollection.SyncRoot {
2875                                 get { return this; }
2876                         }
2877
2878                         bool IList.IsFixedSize {
2879                                 get { return true; }
2880                         }
2881
2882                         object IList.this [int index] {
2883                                 get { return this [index]; }
2884                                 set { throw new NotSupportedException ("SetItem operation is not supported."); }
2885                         }
2886                         #endregion      // Public Properties
2887
2888                         #region Public Methods
2889                         public void Clear ()
2890                         {
2891                                 ArrayList copy = (ArrayList) list.Clone ();
2892                                 for (int i = 0; i < copy.Count; i++)
2893                                         ((ListViewItem) copy [i]).Selected = false;
2894
2895                                 list.Clear ();
2896                         }
2897
2898                         public bool Contains (ListViewItem item)
2899                         {
2900                                 return list.Contains (item);
2901                         }
2902
2903                         public void CopyTo (Array dest, int index)
2904                         {
2905                                 list.CopyTo (dest, index);
2906                         }
2907
2908                         public IEnumerator GetEnumerator ()
2909                         {
2910                                 return list.GetEnumerator ();
2911                         }
2912
2913                         int IList.Add (object value)
2914                         {
2915                                 throw new NotSupportedException ("Add operation is not supported.");
2916                         }
2917
2918                         bool IList.Contains (object item)
2919                         {
2920                                 return list.Contains (item);
2921                         }
2922
2923                         int IList.IndexOf (object item)
2924                         {
2925                                 return list.IndexOf (item);
2926                         }
2927
2928                         void IList.Insert (int index, object value)
2929                         {
2930                                 throw new NotSupportedException ("Insert operation is not supported.");
2931                         }
2932
2933                         void IList.Remove (object value)
2934                         {
2935                                 throw new NotSupportedException ("Remove operation is not supported.");
2936                         }
2937
2938                         void IList.RemoveAt (int index)
2939                         {
2940                                 throw new NotSupportedException ("RemoveAt operation is not supported.");
2941                         }
2942
2943                         public int IndexOf (ListViewItem item)
2944                         {
2945                                 return list.IndexOf (item);
2946                         }
2947                         #endregion      // Public Methods
2948
2949                 }       // SelectedListViewItemCollection
2950
2951                 #endregion // Subclasses
2952         }
2953 }