mcs/class/Managed.Windows.Forms/System.Windows.Forms/ComboBox.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) 2004-2006 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jordi Mas i Hernandez, jordi@ximian.com
  24 //      Mike Kestner  <mkestner@novell.com>
  25 //
  26 // NOT COMPLETE
  27
  28 using System;
  29 using System.Drawing;
  30 using System.Collections;
  31 using System.ComponentModel;
  32 using System.Reflection;
  33 using System.ComponentModel.Design;
  34 using System.ComponentModel.Design.Serialization;
  35 using System.Runtime.InteropServices;
  36
  37
  38 namespace System.Windows.Forms
  39 {
  40
  41         [DefaultProperty("Items")]
  42         [DefaultEvent("SelectedIndexChanged")]
  43         [Designer ("System.Windows.Forms.Design.ComboBoxDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  44         public class ComboBox : ListControl
  45         {
  46                 private DrawMode draw_mode = DrawMode.Normal;
  47                 private ComboBoxStyle dropdown_style = (ComboBoxStyle)(-1);
  48                 private int dropdown_width = -1;
  49                 private int selected_index = -1;
  50                 internal ObjectCollection items = null;
  51                 private bool suspend_ctrlupdate;
  52                 private int maxdrop_items = 8;
  53                 private bool integral_height = true;
  54                 private bool sorted;
  55                 private int max_length;
  56                 private ComboListBox listbox_ctrl;
  57                 private ComboTextBox textbox_ctrl;
  58                 private bool process_textchanged_event = true;
  59                 private bool item_height_specified = false;
  60                 private int item_height;
  61                 private int requested_height = -1;
  62                 private Hashtable item_heights;
  63                 private bool show_dropdown_button = false;
  64                 private ButtonState button_state = ButtonState.Normal;
  65                 private bool dropped_down;
  66                 private Rectangle text_area;
  67                 private Rectangle button_area;
  68                 private Rectangle listbox_area;
  69                 private const int button_width = 16;
  70
  71                 [ComVisible(true)]
  72                 public class ChildAccessibleObject : AccessibleObject {
  73                         private ComboBox        owner;
  74                         private IntPtr          handle;
  75
  76                         public ChildAccessibleObject (ComboBox owner, IntPtr handle) {
  77                                 this.owner = owner;
  78                                 this.handle = handle;
  79                         }
  80
  81                         public override string Name {
  82                                 get {
  83                                         return base.Name;
  84                                 }
  85                         }
  86                 }
  87
  88                 public ComboBox ()
  89                 {
  90                         items = new ObjectCollection (this);
  91                         DropDownStyle = ComboBoxStyle.DropDown;
  92                         item_height = FontHeight + 2;
  93                         BackColor = ThemeEngine.Current.ColorWindow;
  94                         border_style = BorderStyle.None;
  95
  96                         /* Events */
  97                         MouseDown += new MouseEventHandler (OnMouseDownCB);
  98                         MouseUp += new MouseEventHandler (OnMouseUpCB);
  99                         MouseMove += new MouseEventHandler (OnMouseMoveCB);
 100                         MouseWheel += new MouseEventHandler (OnMouseWheelCB);
 101                         KeyDown +=new KeyEventHandler(OnKeyDownCB);
 102                 }
 103
 104                 #region events
 105
 106                 [Browsable (false)]
 107                 [EditorBrowsable (EditorBrowsableState.Never)]
 108                 public new event EventHandler BackgroundImageChanged {
 109                         add { base.BackgroundImageChanged += value; }
 110                         remove { base.BackgroundImageChanged -= value; }
 111                 }
 112
 113                 public event DrawItemEventHandler DrawItem;
 114                 public event EventHandler DropDown;
 115                 public event EventHandler DropDownStyleChanged;
 116                 public event MeasureItemEventHandler MeasureItem;
 117
 118                 [Browsable (false)]
 119                 [EditorBrowsable (EditorBrowsableState.Never)]
 120                 public new event PaintEventHandler Paint {
 121                         add { base.Paint += value; }
 122                         remove { base.Paint -= value; }
 123                 }
 124
 125                 public event EventHandler SelectedIndexChanged;
 126                 public event EventHandler SelectionChangeCommitted;
 127                 #endregion Events
 128
 129                 #region Public Properties
 130                 public override Color BackColor {
 131                         get { return base.BackColor; }
 132                         set {
 133                                 if (base.BackColor == value)
 134                                         return;
 135
 136                                 base.BackColor = value;
 137                                 Refresh ();
 138                         }
 139                 }
 140
 141                 [Browsable (false)]
 142                 [EditorBrowsable (EditorBrowsableState.Never)]
 143                 public override Image BackgroundImage {
 144                         get { return base.BackgroundImage; }
 145                         set {
 146                                 if (base.BackgroundImage == value)
 147                                         return;
 148
 149                                 base.BackgroundImage = value;
 150                                 Refresh ();
 151                         }
 152                 }
 153
 154                 protected override CreateParams CreateParams {
 155                         get { return base.CreateParams;}
 156                 }
 157
 158                 protected override Size DefaultSize {
 159                         get { return new Size (121, 21); }
 160                 }
 161
 162                 [RefreshProperties(RefreshProperties.Repaint)]
 163                 [DefaultValue (DrawMode.Normal)]
 164                 public DrawMode DrawMode {
 165                         get { return draw_mode; }
 166
 167                         set {
 168                                 if (!Enum.IsDefined (typeof (DrawMode), value))
 169                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for DrawMode", value));
 170
 171                                 if (draw_mode == value)
 172                                         return;
 173
 174                                 if (draw_mode == DrawMode.OwnerDrawVariable)
 175                                         item_heights = null;
 176                                 draw_mode = value;
 177                                 if (draw_mode == DrawMode.OwnerDrawVariable)
 178                                         item_heights = new Hashtable ();
 179                                 Refresh ();
 180                         }
 181                 }
 182
 183                 [DefaultValue (ComboBoxStyle.DropDown)]
 184                 [RefreshProperties(RefreshProperties.Repaint)]
 185                 public ComboBoxStyle DropDownStyle {
 186                         get { return dropdown_style; }
 187
 188                         set {
 189
 190                                 if (!Enum.IsDefined (typeof (ComboBoxStyle), value))
 191                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for ComboBoxStyle", value));
 192
 193                                 if (dropdown_style == value)
 194                                         return;
 195
 196                                 if (dropdown_style == ComboBoxStyle.Simple) {
 197                                         if (listbox_ctrl != null) {
 198                                                 Controls.RemoveImplicit (listbox_ctrl);
 199                                                 listbox_ctrl.Dispose ();
 200                                                 listbox_ctrl = null;
 201                                         }
 202                                 }
 203
 204                                 dropdown_style = value;
 205
 206                                 if (dropdown_style == ComboBoxStyle.DropDownList && textbox_ctrl != null) {
 207                                         Controls.RemoveImplicit (textbox_ctrl);
 208                                         textbox_ctrl.Dispose ();
 209                                         textbox_ctrl = null;
 210                                 }
 211
 212                                 if (dropdown_style == ComboBoxStyle.Simple) {
 213                                         show_dropdown_button = false;
 214
 215                                         CreateComboListBox ();
 216
 217                                         if (IsHandleCreated)
 218                                                 Controls.AddImplicit (listbox_ctrl);
 219                                 } else {
 220                                         show_dropdown_button = true;
 221                                         button_state = ButtonState.Normal;
 222                                 }
 223
 224                                 if (dropdown_style != ComboBoxStyle.DropDownList && textbox_ctrl == null) {
 225                                         textbox_ctrl = new ComboTextBox (this);
 226                                         object selected_item = SelectedItem;
 227                                         if (selected_item != null)
 228                                                 textbox_ctrl.Text = GetItemText (selected_item);
 229                                         textbox_ctrl.BorderStyle = BorderStyle.None;
 230                                         textbox_ctrl.TextChanged += new EventHandler (OnTextChangedEdit);
 231                                         textbox_ctrl.Click += new EventHandler (OnTextBoxClick);
 232
 233                                         if (IsHandleCreated == true) {
 234                                                 Controls.AddImplicit (textbox_ctrl);
 235                                         }
 236                                 }
 237
 238                                 OnDropDownStyleChanged (EventArgs.Empty);
 239
 240                                 Layout ();
 241                                 UpdateBounds ();
 242                                 Refresh ();
 243                         }
 244                 }
 245
 246                 public int DropDownWidth {
 247                         get {
 248                                 if (dropdown_width == -1)
 249                                         return Width;
 250
 251                                 return dropdown_width;
 252                         }
 253                         set {
 254                                 if (dropdown_width == value)
 255                                         return;
 256
 257                                 if (value < 1)
 258                                         throw new ArgumentException ("The DropDownWidth value is less than one");
 259
 260                                 dropdown_width = value;
 261                         }
 262                 }
 263
 264                 [Browsable (false)]
 265                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 266                 public bool DroppedDown {
 267                         get {
 268                                 if (dropdown_style == ComboBoxStyle.Simple)
 269                                         return true;
 270
 271                                 return dropped_down;
 272                         }
 273                         set {
 274                                 if (dropdown_style == ComboBoxStyle.Simple || dropped_down == value)
 275                                         return;
 276
 277                                 if (value)
 278                                         DropDownListBox ();
 279                                 else
 280                                         listbox_ctrl.Hide ();
 281                         }
 282                 }
 283
 284                 public override bool Focused {
 285                         get { return base.Focused; }
 286                 }
 287
 288                 public override Color ForeColor {
 289                         get { return base.ForeColor; }
 290                         set {
 291                                 if (base.ForeColor == value)
 292                                         return;
 293
 294                                 base.ForeColor = value;
 295                                 Refresh ();
 296                         }
 297                 }
 298
 299                 [DefaultValue (true)]
 300                 [Localizable (true)]
 301                 public bool IntegralHeight {
 302                         get { return integral_height; }
 303                         set {
 304                                 if (integral_height == value)
 305                                         return;
 306
 307                                 integral_height = value;
 308                                 UpdateBounds ();
 309                                 Refresh ();
 310                         }
 311                 }
 312
 313                 [Localizable (true)]
 314                 public int ItemHeight {
 315                         get {
 316                                 if (item_height == -1) {
 317                                         SizeF sz = DeviceContext.MeasureString ("The quick brown Fox", Font);
 318                                         item_height = (int) sz.Height;
 319                                 }
 320                                 return item_height;
 321                         }
 322                         set {
 323                                 if (value < 0)
 324                                         throw new ArgumentException ("The item height value is less than zero");
 325
 326                                 item_height_specified = true;
 327                                 item_height = value;
 328                                 if (IntegralHeight)
 329                                         UpdateBounds ();
 330                                 Layout ();
 331                                 Refresh ();
 332                         }
 333                 }
 334
 335                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 336                 [Localizable (true)]
 337                 [Editor ("System.Windows.Forms.Design.ListControlStringCollectionEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 338                 public ComboBox.ObjectCollection Items {
 339                         get { return items; }
 340                 }
 341
 342                 [DefaultValue (8)]
 343                 [Localizable (true)]
 344                 public int MaxDropDownItems {
 345                         get { return maxdrop_items; }
 346                         set {
 347                                 if (maxdrop_items == value)
 348                                         return;
 349
 350                                 maxdrop_items = value;
 351                         }
 352                 }
 353
 354                 [DefaultValue (0)]
 355                 [Localizable (true)]
 356                 public int MaxLength {
 357                         get { return max_length; }
 358                         set {
 359                                 if (max_length == value)
 360                                         return;
 361
 362                                 max_length = value;
 363
 364                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 365
 366                                         if (value < 0) {
 367                                                 value = 0;
 368                                         }
 369
 370                                         textbox_ctrl.MaxLength = value;
 371                                 }
 372                         }
 373                 }
 374
 375                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 376                 [Browsable (false)]
 377                 public int PreferredHeight {
 378                         get {
 379                                 return ItemHeight + 5;
 380                         }
 381                 }
 382
 383                 [Browsable (false)]
 384                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 385                 public override int SelectedIndex {
 386                         get { return selected_index; }
 387                         set {
 388                                 if (value <= -2 || value >= Items.Count)
 389                                         throw new ArgumentOutOfRangeException ("Index of out range");
 390                                 selected_index = value;
 391
 392                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 393                                         if (value == -1)
 394                                                 SetControlText("");
 395                                         else
 396                                                 SetControlText (GetItemText (Items [value]));
 397                                 }
 398
 399                                 OnSelectedValueChanged (new EventArgs ());
 400                                 OnSelectedIndexChanged  (new EventArgs ());
 401                                 OnSelectedItemChanged (new EventArgs ());
 402                                 if (DropDownStyle == ComboBoxStyle.DropDownList)
 403                                         Invalidate ();
 404
 405                                 if (listbox_ctrl != null)
 406                                         listbox_ctrl.HighlightedIndex = value;
 407                         }
 408                 }
 409
 410                 [Browsable (false)]
 411                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 412                 [Bindable(true)]
 413                 public object SelectedItem {
 414                         get { return selected_index == -1 ? null : Items [selected_index]; }
 415                         set {
 416                                 object item = selected_index == -1 ? null : Items [selected_index];
 417                                 if (item == value)
 418                                         return;
 419
 420                                 SelectedIndex = Items.IndexOf (value);
 421                         }
 422                 }
 423
 424                 [Browsable (false)]
 425                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 426                 public string SelectedText {
 427                         get {
 428                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 429                                         return "";
 430
 431                                 return textbox_ctrl.SelectedText;
 432                         }
 433                         set {
 434                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 435                                         return;
 436
 437                                 textbox_ctrl.SelectedText = value;
 438                         }
 439                 }
 440
 441                 [Browsable (false)]
 442                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 443                 public int SelectionLength {
 444                         get {
 445                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 446                                         return 0;
 447
 448                                 return textbox_ctrl.SelectionLength;
 449                         }
 450                         set {
 451                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 452                                         return;
 453
 454                                 if (textbox_ctrl.SelectionLength == value)
 455                                         return;
 456
 457                                 textbox_ctrl.SelectionLength = value;
 458                         }
 459                 }
 460
 461                 [Browsable (false)]
 462                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 463                 public int SelectionStart {
 464                         get {
 465                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 466                                         return 0;
 467
 468                                 return textbox_ctrl.SelectionStart;
 469                         }
 470                         set {
 471                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 472                                         return;
 473
 474                                 if (textbox_ctrl.SelectionStart == value)
 475                                         return;
 476
 477                                 textbox_ctrl.SelectionStart = value;
 478                         }
 479                 }
 480
 481                 [DefaultValue (false)]
 482                 public bool Sorted {
 483                         get { return sorted; }
 484
 485                         set {
 486                                 if (sorted == value)
 487                                         return;
 488
 489                                 sorted = value;
 490                                 SelectedIndex = -1;
 491                                 if (sorted) {
 492                                         Items.Sort ();
 493                                         Layout ();
 494                                 }
 495                         }
 496                 }
 497
 498                 [Bindable (true)]
 499                 [Localizable (true)]
 500                 public override string Text {
 501                         get {
 502                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 503                                         if (textbox_ctrl != null) {
 504                                                 return textbox_ctrl.Text;
 505                                         }
 506                                 }
 507
 508                                 if (SelectedItem != null)
 509                                         return GetItemText (SelectedItem);
 510
 511                                 return base.Text;
 512                         }
 513                         set {
 514                                 if (value == null) {
 515                                         SelectedIndex = -1;
 516                                         return;
 517                                 }
 518
 519                                 int index = FindString (value);
 520
 521                                 if (index != -1) {
 522                                         SelectedIndex = index;
 523                                         return;
 524                                 }
 525
 526                                 if (dropdown_style != ComboBoxStyle.DropDownList)
 527                                         textbox_ctrl.Text = GetItemText (value);
 528                         }
 529                 }
 530
 531                 #endregion Public Properties
 532
 533                 #region Public Methods
 534                 protected virtual void AddItemsCore (object[] value)
 535                 {
 536
 537                 }
 538
 539                 public void BeginUpdate ()
 540                 {
 541                         suspend_ctrlupdate = true;
 542                 }
 543
 544                 protected override void Dispose (bool disposing)
 545                 {
 546                         if (disposing) {
 547                                 if (listbox_ctrl != null) {
 548                                         listbox_ctrl.Dispose ();
 549                                         Controls.RemoveImplicit (listbox_ctrl);
 550                                         listbox_ctrl = null;
 551                                 }
 552
 553                                 if (textbox_ctrl != null) {
 554                                         Controls.RemoveImplicit (textbox_ctrl);
 555                                         textbox_ctrl.Dispose ();
 556                                         textbox_ctrl = null;
 557                                 }
 558                         }
 559
 560                         base.Dispose (disposing);
 561                 }
 562
 563                 public void EndUpdate ()
 564                 {
 565                         suspend_ctrlupdate = false;
 566                         UpdatedItems ();
 567                         Refresh ();
 568                 }
 569
 570                 public int FindString (string s)
 571                 {
 572                         return FindString (s, -1);
 573                 }
 574
 575                 public int FindString (string s, int startIndex)
 576                 {
 577                         if (Items.Count == 0)
 578                                 return -1; // No exception throwing if empty
 579
 580                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 581                                 throw new  ArgumentOutOfRangeException ("Index of out range");
 582
 583                         startIndex++;
 584                         for (int i = startIndex; i < Items.Count; i++) {
 585                                 if ((GetItemText (Items[i])).StartsWith (s))
 586                                         return i;
 587                         }
 588
 589                         return -1;
 590                 }
 591
 592                 public int FindStringExact (string s)
 593                 {
 594                         return FindStringExact (s, -1);
 595                 }
 596
 597                 public int FindStringExact (string s, int startIndex)
 598                 {
 599                         if (Items.Count == 0)
 600                                 return -1; // No exception throwing if empty
 601
 602                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 603                                 throw new ArgumentOutOfRangeException ("Index of out range");
 604
 605                         startIndex++;
 606                         for (int i = startIndex; i < Items.Count; i++) {
 607                                 if ((GetItemText (Items[i])).Equals (s))
 608                                         return i;
 609                         }
 610
 611                         return -1;
 612                 }
 613
 614                 public int GetItemHeight (int index)
 615                 {
 616                         if (DrawMode == DrawMode.OwnerDrawVariable && IsHandleCreated) {
 617
 618                                 if (index < 0 || index >= Items.Count )
 619                                         throw new ArgumentOutOfRangeException ("The item height value is less than zero");
 620
 621                                 object item = Items [index];
 622                                 if (item_heights.Contains (item))
 623                                         return (int) item_heights [item];
 624
 625                                 MeasureItemEventArgs args = new MeasureItemEventArgs (DeviceContext, index, ItemHeight);
 626                                 OnMeasureItem (args);
 627                                 item_heights [item] = args.ItemHeight;
 628                                 return args.ItemHeight;
 629                         }
 630
 631                         return ItemHeight;
 632                 }
 633
 634                 protected override bool IsInputKey (Keys keyData)
 635                 {
 636                         switch (keyData) {
 637                         case Keys.Up:
 638                         case Keys.Down:
 639                         case Keys.Left:
 640                         case Keys.Right:
 641                         case Keys.PageUp:
 642                         case Keys.PageDown:
 643                                 return true;
 644
 645                         default:
 646                                 return false;
 647                         }
 648                 }
 649
 650                 protected override void OnBackColorChanged (EventArgs e)
 651                 {
 652                         base.OnBackColorChanged (e);
 653                 }
 654
 655                 protected override void OnDataSourceChanged (EventArgs e)
 656                 {
 657                         base.OnDataSourceChanged (e);
 658                         BindDataItems ();
 659
 660                         if (DataSource == null || DataManager == null) {
 661                                 SelectedIndex = -1;
 662                         }
 663                         else {
 664                                 SelectedIndex = DataManager.Position;
 665                         }
 666                 }
 667
 668                 protected override void OnDisplayMemberChanged (EventArgs e)
 669                 {
 670                         base.OnDisplayMemberChanged (e);
 671
 672                         if (DataManager == null || !IsHandleCreated)
 673                                return;
 674
 675                         BindDataItems ();
 676                         SelectedIndex = DataManager.Position;
 677                 }
 678
 679                 protected virtual void OnDrawItem (DrawItemEventArgs e)
 680                 {
 681                         switch (DrawMode) {
 682                         case DrawMode.OwnerDrawFixed:
 683                         case DrawMode.OwnerDrawVariable:
 684                                 if (DrawItem != null)
 685                                         DrawItem (this, e);
 686                                 break;
 687                         default:
 688                                 ThemeEngine.Current.DrawComboBoxItem (this, e);
 689                                 break;
 690                         }
 691                 }
 692
 693                 protected virtual void OnDropDown (EventArgs e)
 694                 {
 695                         if (DropDown != null)
 696                                 DropDown (this, e);
 697                 }
 698
 699                 protected virtual void OnDropDownStyleChanged (EventArgs e)
 700                 {
 701                         if (DropDownStyleChanged != null)
 702                                 DropDownStyleChanged (this, e);
 703                 }
 704
 705                 protected override void OnFontChanged (EventArgs e)
 706                 {
 707                         base.OnFontChanged (e);
 708
 709                         if (textbox_ctrl != null)
 710                                 textbox_ctrl.Font = Font;
 711
 712                         if (!item_height_specified) {
 713                                 SizeF sz = DeviceContext.MeasureString ("The quick brown Fox", Font);
 714                                 item_height = (int) sz.Height;
 715                         }
 716
 717                         if (IntegralHeight)
 718                                 UpdateBounds ();
 719
 720                         Layout ();
 721                 }
 722
 723                 protected override void OnForeColorChanged (EventArgs e)
 724                 {
 725                         base.OnForeColorChanged (e);
 726                 }
 727
 728                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 729                 protected override void OnGotFocus (EventArgs e)
 730                 {
 731                         if (dropdown_style == ComboBoxStyle.DropDownList) {
 732                                 // We draw DDL styles manually, so they require a
 733                                 // refresh to have their selection drawn
 734                                 Invalidate ();
 735                         }
 736
 737                         if (textbox_ctrl != null) {
 738                                 textbox_ctrl.SetSelectable (false);
 739                                 textbox_ctrl.ActivateCaret (true);
 740                                 textbox_ctrl.ShowSelection = true;
 741                                 textbox_ctrl.SelectAll ();
 742                         }
 743
 744                         base.OnGotFocus (e);
 745                 }
 746
 747                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 748                 protected override void OnLostFocus (EventArgs e)
 749                 {
 750                         if (dropdown_style == ComboBoxStyle.DropDownList) {
 751                                 // We draw DDL styles manually, so they require a
 752                                 // refresh to have their selection drawn
 753                                 Invalidate ();
 754                         }
 755
 756                         if (listbox_ctrl != null && dropped_down) {
 757                                 listbox_ctrl.HideWindow ();
 758                         }
 759
 760                         if (textbox_ctrl != null) {
 761                                 textbox_ctrl.SetSelectable (true);
 762                                 textbox_ctrl.ActivateCaret (false);
 763                                 textbox_ctrl.ShowSelection = false;
 764                         }
 765
 766                         base.OnLostFocus (e);
 767                 }
 768
 769                 protected override void OnHandleCreated (EventArgs e)
 770                 {
 771                         base.OnHandleCreated (e);
 772
 773                         if (listbox_ctrl != null)
 774                                 Controls.AddImplicit (listbox_ctrl);
 775
 776                         if (textbox_ctrl != null)
 777                                 Controls.AddImplicit (textbox_ctrl);
 778
 779                         Layout ();
 780                 }
 781
 782                 protected override void OnHandleDestroyed (EventArgs e)
 783                 {
 784                         base.OnHandleDestroyed (e);
 785                 }
 786
 787                 protected override void OnKeyPress (KeyPressEventArgs e)
 788                 {
 789                         // int index = FindStringCaseInsensitive (e.KeyChar.ToString (), SelectedIndex);
 790                         //if (index != -1)
 791                         //      SelectedIndex = index;
 792
 793                         base.OnKeyPress (e);
 794                 }
 795
 796                 protected virtual void OnMeasureItem (MeasureItemEventArgs e)
 797                 {
 798                         if (MeasureItem != null)
 799                                 MeasureItem (this, e);
 800                 }
 801
 802                 protected override void OnParentBackColorChanged (EventArgs e)
 803                 {
 804                         base.OnParentBackColorChanged (e);
 805                 }
 806
 807                 protected override void OnResize (EventArgs e)
 808                 {
 809                         Layout ();
 810                         if (listbox_ctrl != null)
 811                                 listbox_ctrl.CalcListBoxArea ();
 812                 }
 813
 814                 protected override void OnSelectedIndexChanged (EventArgs e)
 815                 {
 816                         base.OnSelectedIndexChanged (e);
 817
 818                         if (SelectedIndexChanged != null)
 819                                 SelectedIndexChanged (this, e);
 820                 }
 821
 822                 protected virtual void OnSelectedItemChanged (EventArgs e)
 823                 {
 824
 825                 }
 826
 827                 protected override void OnSelectedValueChanged (EventArgs e)
 828                 {
 829                         base.OnSelectedValueChanged (e);
 830                 }
 831
 832                 protected virtual void OnSelectionChangeCommitted (EventArgs e)
 833                 {
 834                         if (SelectionChangeCommitted != null)
 835                                 SelectionChangeCommitted (this, e);
 836                 }
 837
 838                 protected override void RefreshItem (int index)
 839                 {
 840                         if (index < 0 || index >= Items.Count)
 841                                 throw new ArgumentOutOfRangeException ("Index of out range");
 842
 843                         if (draw_mode == DrawMode.OwnerDrawVariable)
 844                                 item_heights.Remove (Items [index]);
 845                 }
 846
 847                 public void Select (int start, int length)
 848                 {
 849                         if (start < 0)
 850                                 throw new ArgumentException ("Start cannot be less than zero");
 851
 852                         if (length < 0)
 853                                 throw new ArgumentException ("length cannot be less than zero");
 854
 855                         if (dropdown_style == ComboBoxStyle.DropDownList)
 856                                 return;
 857
 858                         textbox_ctrl.Select (start, length);
 859                 }
 860
 861                 public void SelectAll ()
 862                 {
 863                         if (dropdown_style == ComboBoxStyle.DropDownList)
 864                                 return;
 865
 866                         if (textbox_ctrl != null) {
 867                                 textbox_ctrl.ShowSelection = true;
 868                                 textbox_ctrl.SelectAll ();
 869                         }
 870                 }
 871
 872                 protected override void SetBoundsCore (int x, int y, int width, int height, BoundsSpecified specified)
 873                 {
 874                         if ((specified & BoundsSpecified.Height) != 0) {
 875                                 requested_height = height;
 876
 877                                 if (DropDownStyle == ComboBoxStyle.Simple && height > PreferredHeight) {
 878                                         if (IntegralHeight) {
 879                                                 int border = ThemeEngine.Current.Border3DSize.Height;
 880                                                 int lb_height = height - PreferredHeight - 2;
 881                                                 if (lb_height - 2 * border > ItemHeight) {
 882                                                         int partial = (lb_height - 2 * border) % ItemHeight;
 883                                                         height -= partial;
 884                                                 } else
 885                                                         height = PreferredHeight;
 886                                         }
 887                                 } else
 888                                         height = PreferredHeight;
 889                         }
 890
 891                         base.SetBoundsCore (x, y, width, height, specified);
 892                 }
 893
 894                 protected override void SetItemCore (int index, object value)
 895                 {
 896                         if (index < 0 || index >= Items.Count)
 897                                 return;
 898
 899                         Items[index] = value;
 900                 }
 901
 902                 protected override void SetItemsCore (IList value)
 903                 {
 904                         BeginUpdate ();
 905                         try {
 906                                 Items.Clear ();
 907                                 Items.AddRange (value);
 908                         } finally {
 909                                EndUpdate ();
 910                         }
 911                 }
 912
 913                 public override string ToString ()
 914                 {
 915                         return base.ToString () + ", Items.Count:" + Items.Count;
 916                 }
 917
 918                 protected override void WndProc (ref Message m)
 919                 {
 920                         switch ((Msg) m.Msg) {
 921                         case Msg.WM_KEYUP:
 922                         case Msg.WM_KEYDOWN:
 923                                 Keys keys = (Keys) m.WParam.ToInt32 ();
 924                                 if (keys == Keys.Up || keys == Keys.Down)
 925                                         break;
 926                                 goto case Msg.WM_CHAR;
 927                         case Msg.WM_CHAR:
 928                                 if (textbox_ctrl != null)
 929                                         XplatUI.SendMessage (textbox_ctrl.Handle, (Msg) m.Msg, m.WParam, m.LParam);
 930                                 break;
 931                         case Msg.WM_MOUSE_LEAVE:
 932                                 Point location = PointToClient (Control.MousePosition);
 933                                 if (ClientRectangle.Contains (location))
 934                                         return;
 935                                 break;
 936                         default:
 937                                 break;
 938                         }
 939                         base.WndProc (ref m);
 940                 }
 941
 942                 #endregion Public Methods
 943
 944                 #region Private Methods
 945
 946                 internal override bool InternalCapture {
 947                         get { return Capture; }
 948                         set {}
 949                 }
 950
 951                 void Layout ()
 952                 {
 953                         int border = ThemeEngine.Current.Border3DSize.Width;
 954
 955                         text_area = ClientRectangle;
 956                         text_area.Height = PreferredHeight;
 957
 958                         listbox_area = ClientRectangle;
 959                         listbox_area.Y = text_area.Bottom + 3;
 960                         listbox_area.Height -= (text_area.Height + 2);
 961
 962                         Rectangle prev_button_area = button_area;
 963
 964                         if (DropDownStyle == ComboBoxStyle.Simple)
 965                                 button_area = Rectangle.Empty;
 966                         else {
 967                                 button_area = text_area;
 968                                 button_area.X = text_area.Right - button_width - border;
 969                                 button_area.Y = text_area.Y + border;
 970                                 button_area.Width = button_width;
 971                                 button_area.Height = text_area.Height - 2 * border;
 972                         }
 973
 974                         if (button_area != prev_button_area) {
 975                                 prev_button_area.Y -= border;
 976                                 prev_button_area.Width += border;
 977                                 prev_button_area.Height += 2 * border;
 978                                 Invalidate (prev_button_area);
 979                                 Invalidate (button_area);
 980                         }
 981
 982                         if (textbox_ctrl != null) {
 983                                 textbox_ctrl.Location = new Point (text_area.X + border, text_area.Y + border);
 984                                 textbox_ctrl.Width = text_area.Width - button_area.Width - border * 2;
 985                                 textbox_ctrl.Height = text_area.Height - border * 2;
 986                         }
 987
 988                         if (listbox_ctrl != null && dropdown_style == ComboBoxStyle.Simple) {
 989                                 listbox_ctrl.Location = listbox_area.Location;
 990                                 listbox_ctrl.CalcListBoxArea ();
 991                         }
 992                 }
 993
 994                 private void CreateComboListBox ()
 995                 {
 996                         listbox_ctrl = new ComboListBox (this);
 997                         listbox_ctrl.HighlightedIndex = SelectedIndex;
 998                 }
 999
1000                 internal void Draw (Rectangle clip, Graphics dc)
1001                 {
1002                         Theme theme = ThemeEngine.Current;
1003
1004                         if (DropDownStyle == ComboBoxStyle.Simple)
1005                                 dc.FillRectangle (theme.ResPool.GetSolidBrush (Parent.BackColor), ClientRectangle);
1006
1007                         if (clip.IntersectsWith (text_area))
1008                                 ControlPaint.DrawBorder3D (dc, text_area, Border3DStyle.Sunken);
1009
1010                         int border = theme.Border3DSize.Width;
1011
1012                         // No edit control, we paint the edit ourselves
1013                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1014                                 DrawItemState state = DrawItemState.None;
1015                                 Rectangle item_rect = text_area;
1016                                 item_rect.X += border;
1017                                 item_rect.Y += border;
1018                                 item_rect.Width -= (button_area.Width + 2 * border);
1019                                 item_rect.Height -= 2 * border;
1020
1021                                 if (Focused) {
1022                                         state = DrawItemState.Selected;
1023                                         state |= DrawItemState.Focus;
1024                                 }
1025
1026                                 state |= DrawItemState.ComboBoxEdit;
1027                                 OnDrawItem (new DrawItemEventArgs (dc, Font, item_rect, SelectedIndex, state, ForeColor, BackColor));
1028                         }
1029
1030                         if (show_dropdown_button) {
1031                                 dc.FillRectangle (theme.ResPool.GetSolidBrush (theme.ColorControl), button_area);
1032
1033                                 if (!is_enabled)
1034                                         button_state = ButtonState.Inactive;
1035
1036                                 theme.CPDrawComboButton (dc, button_area, button_state);
1037                         }
1038                 }
1039
1040                 internal void DropDownListBox ()
1041                 {
1042                         if (DropDownStyle == ComboBoxStyle.Simple)
1043                                 return;
1044
1045                         if (listbox_ctrl == null)
1046                                 CreateComboListBox ();
1047
1048                         listbox_ctrl.Location = PointToScreen (new Point (text_area.X, text_area.Y + text_area.Height));
1049
1050                         if (listbox_ctrl.ShowWindow ())
1051                                 dropped_down = true;
1052
1053                         button_state = ButtonState.Pushed;
1054                         if (dropdown_style == ComboBoxStyle.DropDownList)
1055                                 Invalidate (text_area);
1056
1057                         OnDropDown (EventArgs.Empty);
1058                 }
1059
1060                 internal void DropDownListBoxFinished ()
1061                 {
1062                         if (DropDownStyle == ComboBoxStyle.Simple)
1063                                 return;
1064
1065                         button_state = ButtonState.Normal;
1066                         Invalidate (button_area);
1067                         dropped_down = false;
1068                 }
1069
1070                 private int FindStringCaseInsensitive (string search)
1071                 {
1072                         if (search.Length == 0) {
1073                                 return -1;
1074                         }
1075
1076                         for (int i = 0; i < Items.Count; i++)
1077                         {
1078                                 if (String.Compare (GetItemText (Items[i]), 0, search, 0, search.Length, true) == 0)
1079                                         return i;
1080                         }
1081
1082                         return -1;
1083                 }
1084
1085                 internal int FindStringCaseInsensitive (string search, int start_index)
1086                 {
1087                         if (search.Length == 0) {
1088                                 return -1;
1089                         }
1090
1091                         for (int i = 0; i < Items.Count; i++) {
1092                                 int index = (i + start_index) % Items.Count;
1093                                 if (String.Compare (GetItemText (Items [index]), 0, search, 0, search.Length, true) == 0)
1094                                         return index;
1095                         }
1096
1097                         return -1;
1098                 }
1099
1100                 private void OnKeyDownCB(object sender, KeyEventArgs e)
1101                 {
1102                         if (Items.Count == 0)
1103                                 return;
1104
1105                         switch (e.KeyCode)
1106                         {
1107                                 case Keys.Up:
1108                                         SelectedIndex = Math.Max(SelectedIndex-1, 0);
1109                                         break;
1110
1111                                 case Keys.Down:
1112                                         SelectedIndex = Math.Min(SelectedIndex+1, Items.Count-1);
1113                                         break;
1114
1115                                 case Keys.PageUp:
1116                                         if (listbox_ctrl != null)
1117                                                 SelectedIndex = Math.Max(SelectedIndex- (listbox_ctrl.page_size-1), 0);
1118                                         break;
1119
1120                                 case Keys.PageDown:
1121                                         if (listbox_ctrl != null)
1122                                                 SelectedIndex = Math.Min(SelectedIndex+(listbox_ctrl.page_size-1), Items.Count-1);
1123                                         break;
1124
1125                                 default:
1126                                         break;
1127                         }
1128                 }
1129
1130                 void OnMouseDownCB (object sender, MouseEventArgs e)
1131                 {
1132                         Rectangle area;
1133                         if (DropDownStyle == ComboBoxStyle.DropDownList)
1134                                 area = ClientRectangle;
1135                         else
1136                                 area = button_area;
1137
1138                         if (area.Contains (e.X, e.Y)) {
1139                                 DropDownListBox ();
1140                                 Invalidate (button_area);
1141                                 Update ();
1142                         }
1143                         Capture = true;
1144                 }
1145
1146                 void OnMouseMoveCB (object sender, MouseEventArgs e)
1147                 {
1148                         if (DropDownStyle == ComboBoxStyle.Simple)
1149                                 return;
1150
1151                         if (listbox_ctrl != null && listbox_ctrl.Visible) {
1152                                 Point location = listbox_ctrl.PointToClient (Control.MousePosition);
1153                                 if (listbox_ctrl.ClientRectangle.Contains (location))
1154                                         listbox_ctrl.Capture = true;
1155                         }
1156                 }
1157
1158                 void OnMouseUpCB (object sender, MouseEventArgs e)
1159                 {
1160                         Capture = false;
1161                         OnClick (EventArgs.Empty);
1162
1163                         if (dropped_down)
1164                                 listbox_ctrl.Capture = true;
1165                 }
1166
1167                 private void OnMouseWheelCB (object sender, MouseEventArgs me)
1168                 {
1169                         if (Items.Count == 0)
1170                                 return;
1171
1172                         if (listbox_ctrl != null && listbox_ctrl.Visible) {
1173                                 int lines = me.Delta / 120 * SystemInformation.MouseWheelScrollLines;
1174                                 listbox_ctrl.Scroll (-lines);
1175                         } else {
1176                                 int lines = me.Delta / 120;
1177                                 int index = SelectedIndex - lines;
1178                                 if (index < 0)
1179                                         index = 0;
1180                                 else if (index >= Items.Count)
1181                                         index = Items.Count - 1;
1182                                 SelectedIndex = index;
1183                         }
1184                 }
1185
1186                 internal override void OnPaintInternal (PaintEventArgs pevent)
1187                 {
1188                         if (suspend_ctrlupdate)
1189                                 return;
1190
1191                         Draw (ClientRectangle, pevent.Graphics);
1192                 }
1193
1194                 private void OnTextBoxClick (object sender, EventArgs e)
1195                 {
1196                         OnClick (e);
1197                 }
1198
1199                 private void OnTextChangedEdit (object sender, EventArgs e)
1200                 {
1201                         if (process_textchanged_event == false)
1202                                 return;
1203
1204                         OnTextChanged (EventArgs.Empty);
1205
1206                         int item = FindStringCaseInsensitive (textbox_ctrl.Text);
1207
1208                         if (item == -1)
1209                                 return;
1210
1211                         // TODO:  THIS IS BROKEN-ISH
1212                         // I don't think we should hilight, and setting the top item does weirdness
1213                         // when there is no scrollbar
1214
1215                         if (listbox_ctrl != null) {
1216                                 listbox_ctrl.SetTopItem (item);
1217                                 listbox_ctrl.HighlightedIndex = item;
1218                         }
1219
1220                         base.Text = textbox_ctrl.Text;
1221                 }
1222
1223                 internal void SetControlText (string s)
1224                 {
1225                         process_textchanged_event = false;
1226                         textbox_ctrl.Text = s;
1227                         process_textchanged_event = true;
1228                 }
1229
1230                 void UpdateBounds ()
1231                 {
1232                         if (requested_height != -1)
1233                                 SetBounds (0, 0, 0, requested_height, BoundsSpecified.Height);
1234                 }
1235
1236                 private void UpdatedItems ()
1237                 {
1238                         if (listbox_ctrl != null) {
1239                                 listbox_ctrl.UpdateLastVisibleItem ();
1240                                 listbox_ctrl.CalcListBoxArea ();
1241                                 listbox_ctrl.Refresh ();
1242                         }
1243                 }
1244
1245                 #endregion Private Methods
1246
1247                 [ListBindableAttribute (false)]
1248                 public class ObjectCollection : IList, ICollection, IEnumerable
1249                 {
1250
1251                         private ComboBox owner;
1252                         internal ArrayList object_items = new ArrayList ();
1253
1254                         public ObjectCollection (ComboBox owner)
1255                         {
1256                                 this.owner = owner;
1257                         }
1258
1259                         #region Public Properties
1260                         public int Count {
1261                                 get { return object_items.Count; }
1262                         }
1263
1264                         public bool IsReadOnly {
1265                                 get { return false; }
1266                         }
1267
1268                         [Browsable (false)]
1269                         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
1270                         public virtual object this [int index] {
1271                                 get {
1272                                         if (index < 0 || index >= Count)
1273                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1274
1275                                         return object_items[index];
1276                                 }
1277                                 set {
1278                                         if (index < 0 || index >= Count)
1279                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1280                                         if (value == null)
1281                                                 throw new ArgumentNullException ("value");
1282
1283                                         object_items[index] = value;
1284                                         if (owner.listbox_ctrl != null)
1285                                                 owner.listbox_ctrl.InvalidateItem (index);
1286                                         if (index == owner.SelectedIndex) {
1287                                                 if (owner.textbox_ctrl == null)
1288                                                         owner.Refresh ();
1289                                                 else
1290                                                         owner.textbox_ctrl.SelectedText = value.ToString ();
1291                                         }
1292                                 }
1293                         }
1294
1295                         bool ICollection.IsSynchronized {
1296                                 get { return false; }
1297                         }
1298
1299                         object ICollection.SyncRoot {
1300                                 get { return this; }
1301                         }
1302
1303                         bool IList.IsFixedSize {
1304                                 get { return false; }
1305                         }
1306
1307                         #endregion Public Properties
1308
1309                         #region Public Methods
1310                         public int Add (object item)
1311                         {
1312                                 int idx;
1313
1314                                 idx = AddItem (item);
1315                                 owner.UpdatedItems ();
1316                                 return idx;
1317                         }
1318
1319                         public void AddRange (object[] items)
1320                         {
1321                                 if (items == null)
1322                                         throw new ArgumentNullException ("items");
1323
1324                                 foreach (object mi in items)
1325                                         AddItem (mi);
1326
1327                                 owner.UpdatedItems ();
1328                         }
1329
1330                         public void Clear ()
1331                         {
1332                                 owner.selected_index = -1;
1333                                 object_items.Clear ();
1334                                 owner.UpdatedItems ();
1335                                 owner.Refresh ();
1336                         }
1337
1338                         public bool Contains (object obj)
1339                         {
1340                                 if (obj == null)
1341                                         throw new ArgumentNullException ("obj");
1342
1343                                 return object_items.Contains (obj);
1344                         }
1345
1346                         public void CopyTo (object[] dest, int arrayIndex)
1347                         {
1348                                 object_items.CopyTo (dest, arrayIndex);
1349                         }
1350
1351                         void ICollection.CopyTo (Array dest, int index)
1352                         {
1353                                 object_items.CopyTo (dest, index);
1354                         }
1355
1356                         public IEnumerator GetEnumerator ()
1357                         {
1358                                 return object_items.GetEnumerator ();
1359                         }
1360
1361                         int IList.Add (object item)
1362                         {
1363                                 return Add (item);
1364                         }
1365
1366                         public int IndexOf (object value)
1367                         {
1368                                 if (value == null)
1369                                         throw new ArgumentNullException ("value");
1370
1371                                 return object_items.IndexOf (value);
1372                         }
1373
1374                         public void Insert (int index,  object item)
1375                         {
1376                                 if (index < 0 || index > Count)
1377                                         throw new ArgumentOutOfRangeException ("Index of out range");
1378                                 if (item == null)
1379                                         throw new ArgumentNullException ("item");
1380
1381                                 owner.BeginUpdate ();
1382
1383                                 if (owner.Sorted)
1384                                         AddItem (item);
1385                                 else
1386                                         object_items.Insert (index, item);
1387
1388                                 owner.EndUpdate ();     // Calls UpdatedItems
1389                         }
1390
1391                         public void Remove (object value)
1392                         {
1393                                 if (value == null)
1394                                         return;
1395
1396                                 if (IndexOf (value) == owner.SelectedIndex)
1397                                         owner.SelectedIndex = -1;
1398
1399                                 RemoveAt (IndexOf (value));
1400                         }
1401
1402                         public void RemoveAt (int index)
1403                         {
1404                                 if (index < 0 || index >= Count)
1405                                         throw new ArgumentOutOfRangeException ("Index of out range");
1406
1407                                 if (index == owner.SelectedIndex)
1408                                         owner.SelectedIndex = -1;
1409
1410                                 object_items.RemoveAt (index);
1411                                 owner.UpdatedItems ();
1412                         }
1413                         #endregion Public Methods
1414
1415                         #region Private Methods
1416                         private int AddItem (object item)
1417                         {
1418                                 if (item == null)
1419                                         throw new ArgumentNullException ("item");
1420
1421                                 if (owner.Sorted) {
1422                                         int index = 0;
1423                                         foreach (string s in object_items) {
1424                                                 if (String.Compare (item as String, s) < 0) {
1425                                                         object_items.Insert (index, item);
1426                                                         return index;
1427                                                 }
1428                                                 index++;
1429                                         }
1430                                 }
1431                                 object_items.Add (item);
1432                                 return object_items.Count - 1;
1433                         }
1434
1435                         internal void AddRange (IList items)
1436                         {
1437                                 foreach (object mi in items)
1438                                         AddItem (mi);
1439
1440                                 owner.UpdatedItems ();
1441                         }
1442
1443                         internal void Sort ()
1444                         {
1445                                 object_items.Sort ();
1446                         }
1447
1448                         #endregion Private Methods
1449                 }
1450
1451                 internal class ComboTextBox : TextBox {
1452
1453                         private ComboBox owner;
1454
1455                         public ComboTextBox (ComboBox owner)
1456                         {
1457                                 this.owner = owner;
1458                                 ShowSelection = false;
1459                         }
1460
1461                         internal void SetSelectable (bool selectable)
1462                         {
1463                                 SetStyle (ControlStyles.Selectable, selectable);
1464                         }
1465
1466                         internal void ActivateCaret (bool active)
1467                         {
1468                                 if (active)
1469                                         document.CaretHasFocus ();
1470                                 else
1471                                         document.CaretLostFocus ();
1472                         }
1473
1474                         internal override void OnGotFocusInternal (EventArgs e)
1475                         {
1476                                 owner.Select (false, true);
1477                         }
1478
1479                         internal override void OnLostFocusInternal (EventArgs e)
1480                         {
1481                                 owner.Select (false, true);
1482                         }
1483                 }
1484
1485                 internal class ComboListBox : Control
1486                 {
1487                         private ComboBox owner;
1488                         private VScrollBarLB vscrollbar_ctrl;
1489                         private int top_item;                   /* First item that we show the in the current page */
1490                         private int last_item;                  /* Last visible item */
1491                         internal int page_size;                 /* Number of listbox items per page */
1492                         private Rectangle textarea_drawable;    /* Rectangle of the drawable text area */
1493
1494                         internal enum ItemNavigation
1495                         {
1496                                 First,
1497                                 Last,
1498                                 Next,
1499                                 Previous,
1500                                 NextPage,
1501                                 PreviousPage,
1502                         }
1503
1504                         class VScrollBarLB : VScrollBar
1505                         {
1506                                 public VScrollBarLB ()
1507                                 {
1508                                 }
1509
1510                                 internal override bool InternalCapture {
1511                                         get { return Capture; }
1512                                         set { }
1513                                 }
1514
1515                                 public bool FireMouseDown (MouseEventArgs e)
1516                                 {
1517                                         if (Visible) {
1518                                                 e = TranslateEvent (e);
1519                                                 if (ClientRectangle.Contains (e.X, e.Y)) {
1520                                                         OnMouseDown (e);
1521                                                         return true;
1522                                                 }
1523                                         }
1524                                         return false;
1525                                 }
1526
1527                                 public void FireMouseUp (MouseEventArgs e)
1528                                 {
1529                                         if (Visible) {
1530                                                 e = TranslateEvent (e);
1531                                                 if (ClientRectangle.Contains (e.X, e.Y))
1532                                                         OnMouseUp (e);
1533                                         }
1534                                 }
1535
1536                                 public void FireMouseMove (MouseEventArgs e)
1537                                 {
1538                                         if (Visible) {
1539                                                 e = TranslateEvent (e);
1540                                                 if (ClientRectangle.Contains (e.X, e.Y))
1541                                                         OnMouseMove (e);
1542                                         }
1543                                 }
1544
1545                                 MouseEventArgs TranslateEvent (MouseEventArgs e)
1546                                 {
1547                                         Point loc = PointToClient (Control.MousePosition);
1548                                         return new MouseEventArgs (e.Button, e.Clicks, loc.X, loc.Y, e.Delta);
1549                                 }
1550                         }
1551
1552                         public ComboListBox (ComboBox owner)
1553                         {
1554                                 this.owner = owner;
1555                                 top_item = 0;
1556                                 last_item = 0;
1557                                 page_size = 0;
1558
1559                                 MouseWheel += new MouseEventHandler (OnMouseWheelCLB);
1560
1561                                 SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
1562                                 SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
1563
1564                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1565                                         InternalBorderStyle = BorderStyle.Fixed3D;
1566                                 else
1567                                         InternalBorderStyle = BorderStyle.FixedSingle;
1568                         }
1569
1570                         protected override CreateParams CreateParams
1571                         {
1572                                 get {
1573                                         CreateParams cp = base.CreateParams;
1574                                         if (owner == null || owner.DropDownStyle == ComboBoxStyle.Simple)
1575                                                 return cp;
1576
1577                                         cp.Style ^= (int) WindowStyles.WS_CHILD;
1578                                         cp.Style |= (int) WindowStyles.WS_POPUP;
1579                                         cp.ExStyle |= (int) WindowExStyles.WS_EX_TOOLWINDOW | (int) WindowExStyles.WS_EX_TOPMOST;
1580                                         return cp;
1581                                 }
1582                         }
1583
1584                         protected override void Select (bool directed, bool forward)
1585                         {
1586                                 // Do nothing, we never want to be selected
1587                         }
1588
1589                         internal override bool InternalCapture {
1590                                 get {
1591                                         return Capture;
1592                                 }
1593
1594                                 set {
1595                                 }
1596                         }
1597
1598                         int BorderWidth {
1599                                 get {
1600                                         switch (border_style) {
1601                                         case BorderStyle.Fixed3D:
1602                                                 return ThemeEngine.Current.Border3DSize.Width;
1603                                         default:
1604                                                 return ThemeEngine.Current.BorderSize.Width;
1605                                         }
1606                                 }
1607                         }
1608
1609                         #region Private Methods
1610                         // Calcs the listbox area
1611                         internal void CalcListBoxArea ()
1612                         {
1613                                 int width, height;
1614                                 bool show_scrollbar = false;
1615
1616                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1617                                         Rectangle area = owner.listbox_area;
1618                                         width = area.Width;
1619                                         height = area.Height;
1620                                 }
1621                                 else { // DropDown or DropDownList
1622
1623                                         width = owner.DropDownWidth;
1624                                         int count = (owner.Items.Count <= owner.MaxDropDownItems) ? owner.Items.Count : owner.MaxDropDownItems;
1625
1626                                         if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1627                                                 height = 0;
1628                                                 for (int i = 0; i < count; i++) {
1629                                                         height += owner.GetItemHeight (i);
1630                                                 }
1631
1632                                         } else  {
1633                                                 height = owner.ItemHeight * count;
1634                                         }
1635                                 }
1636
1637                                 if (owner.Items.Count <= owner.MaxDropDownItems) {
1638                                         if (vscrollbar_ctrl != null)
1639                                                 vscrollbar_ctrl.Visible = false;
1640                                 } else {
1641                                         /* Need vertical scrollbar */
1642                                         if (vscrollbar_ctrl == null) {
1643                                                 vscrollbar_ctrl = new VScrollBarLB ();
1644                                                 vscrollbar_ctrl.Minimum = 0;
1645                                                 vscrollbar_ctrl.SmallChange = 1;
1646                                                 vscrollbar_ctrl.LargeChange = 1;
1647                                                 vscrollbar_ctrl.Maximum = 0;
1648                                                 vscrollbar_ctrl.ValueChanged += new EventHandler (VerticalScrollEvent);
1649                                                 Controls.AddImplicit (vscrollbar_ctrl);
1650                                         }
1651
1652                                         vscrollbar_ctrl.Height = height - 2 * BorderWidth;
1653
1654                                         vscrollbar_ctrl.Location = new Point (width - vscrollbar_ctrl.Width - BorderWidth - 1, 0);
1655
1656                                         vscrollbar_ctrl.Maximum = owner.Items.Count - (owner.DropDownStyle == ComboBoxStyle.Simple ? page_size : owner.maxdrop_items);
1657                                         show_scrollbar = vscrollbar_ctrl.Visible = true;
1658
1659                                         int hli = HighlightedIndex;
1660                                         if (hli > 0) {
1661                                                 hli = Math.Min (hli, vscrollbar_ctrl.Maximum);
1662                                                 vscrollbar_ctrl.Value = hli;
1663                                         }
1664                                 }
1665
1666                                 Size = new Size (width, height);
1667                                 textarea_drawable = ClientRectangle;
1668                                 textarea_drawable.Width = width;
1669                                 textarea_drawable.Height = height;
1670
1671                                 if (vscrollbar_ctrl != null && show_scrollbar)
1672                                         textarea_drawable.Width -= vscrollbar_ctrl.Width;
1673
1674                                 last_item = LastVisibleItem ();
1675                                 page_size = textarea_drawable.Height / owner.ItemHeight;
1676                         }
1677
1678                         private void Draw (Rectangle clip, Graphics dc)
1679                         {
1680                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (owner.BackColor), clip);
1681
1682                                 if (owner.Items.Count > 0) {
1683
1684                                         for (int i = top_item; i <= last_item; i++) {
1685                                                 Rectangle item_rect = GetItemDisplayRectangle (i, top_item);
1686
1687                                                 if (!clip.IntersectsWith (item_rect))
1688                                                         continue;
1689
1690                                                 DrawItemState state = DrawItemState.None;
1691
1692                                                 if (i == HighlightedIndex) {
1693                                                         state |= DrawItemState.Selected;
1694
1695                                                         if (owner.DropDownStyle == ComboBoxStyle.DropDownList) {
1696                                                                 state |= DrawItemState.Focus;
1697                                                         }
1698                                                 }
1699
1700                                                 owner.OnDrawItem (new DrawItemEventArgs (dc, owner.Font, item_rect,
1701                                                         i, state, owner.ForeColor, owner.BackColor));
1702                                         }
1703                                 }
1704                         }
1705
1706                         int highlighted_index = -1;
1707
1708                         public int HighlightedIndex {
1709                                 get { return highlighted_index; }
1710                                 set {
1711                                         if (highlighted_index == value)
1712                                                 return;
1713
1714                                         if (highlighted_index != -1)
1715                                                 Invalidate (GetItemDisplayRectangle (highlighted_index, top_item));
1716                                         highlighted_index = value;
1717                                         if (highlighted_index != -1)
1718                                                 Invalidate (GetItemDisplayRectangle (highlighted_index, top_item));
1719                                 }
1720                         }
1721
1722                         private Rectangle GetItemDisplayRectangle (int index, int top_index)
1723                         {
1724                                 if (index < 0 || index >= owner.Items.Count)
1725                                         throw new  ArgumentOutOfRangeException ("GetItemRectangle index out of range.");
1726
1727                                 Rectangle item_rect = new Rectangle ();
1728                                 int height = owner.GetItemHeight (index);
1729
1730                                 item_rect.X = 0;
1731                                 item_rect.Width = textarea_drawable.Width;
1732                                 if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1733                                         item_rect.Y = 0;
1734                                         for (int i = top_index; i < index; i++)
1735                                                 item_rect.Y += owner.GetItemHeight (i);
1736                                 } else
1737                                         item_rect.Y = height * (index - top_index);
1738
1739                                 item_rect.Height = height;
1740                                 return item_rect;
1741                         }
1742
1743                         public void HideWindow ()
1744                         {
1745                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1746                                         return;
1747
1748                                 Capture = false;
1749                                 Hide ();
1750                                 owner.DropDownListBoxFinished ();
1751                         }
1752
1753                         private int IndexFromPointDisplayRectangle (int x, int y)
1754                         {
1755                                 for (int i = top_item; i <= last_item; i++) {
1756                                         if (GetItemDisplayRectangle (i, top_item).Contains (x, y) == true)
1757                                                 return i;
1758                                 }
1759
1760                                 return -1;
1761                         }
1762
1763                         public void InvalidateItem (int index)
1764                         {
1765                                 if (Visible)
1766                                         Invalidate (GetItemDisplayRectangle (index, top_item));
1767                         }
1768
1769                         private int LastVisibleItem ()
1770                         {
1771                                 Rectangle item_rect;
1772                                 int top_y = textarea_drawable.Y + textarea_drawable.Height;
1773                                 int i = 0;
1774
1775                                 for (i = top_item; i < owner.Items.Count; i++) {
1776                                         item_rect = GetItemDisplayRectangle (i, top_item);
1777                                         if (item_rect.Y + item_rect.Height > top_y) {
1778                                                 return i;
1779                                         }
1780                                 }
1781                                 return i - 1;
1782                         }
1783
1784                         public void SetTopItem (int item)
1785                         {
1786                                 if (top_item == item)
1787                                         return;
1788                                 top_item = item;
1789                                 UpdateLastVisibleItem ();
1790                                 Invalidate ();
1791                         }
1792
1793                         protected override void OnMouseDown (MouseEventArgs e)
1794                         {
1795                                 if (vscrollbar_ctrl != null)
1796                                         vscrollbar_ctrl.FireMouseDown (e);
1797                         }
1798
1799                         protected override void OnMouseMove (MouseEventArgs e)
1800                         {
1801                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1802                                         return;
1803
1804                                 Point pt = PointToClient (Control.MousePosition);
1805                                 int index = IndexFromPointDisplayRectangle (pt.X, pt.Y);
1806
1807                                 if (index != -1) {
1808                                         HighlightedIndex = index;
1809                                         return;
1810                                 }
1811
1812                                 if (vscrollbar_ctrl != null)
1813                                         vscrollbar_ctrl.FireMouseMove (e);
1814                         }
1815
1816                         protected override void OnMouseUp (MouseEventArgs e)
1817                         {
1818                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1819
1820                                 if (index == -1) {
1821                                         if (vscrollbar_ctrl == null || !vscrollbar_ctrl.FireMouseDown (e))
1822                                                 HideWindow ();
1823                                 } else {
1824                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1825                                         owner.SelectedIndex = index;
1826                                         HideWindow ();
1827                                 }
1828
1829                                 if (vscrollbar_ctrl != null)
1830                                         vscrollbar_ctrl.FireMouseUp (e);
1831                         }
1832
1833                         internal override void OnPaintInternal (PaintEventArgs pevent)
1834                         {
1835                                 Draw (pevent.ClipRectangle,pevent.Graphics);
1836                         }
1837
1838                         public bool ShowWindow ()
1839                         {
1840                                 if (owner.DropDownStyle == ComboBoxStyle.Simple && owner.Items.Count == 0)
1841                                         return false;
1842
1843                                 HighlightedIndex = owner.SelectedIndex;
1844
1845                                 CalcListBoxArea ();
1846                                 Show ();
1847
1848                                 Refresh ();
1849                                 owner.OnDropDown (EventArgs.Empty);
1850                                 return true;
1851                         }
1852
1853                         public void UpdateLastVisibleItem ()
1854                         {
1855                                 last_item = LastVisibleItem ();
1856                         }
1857
1858                         public void Scroll (int delta)
1859                         {
1860                                 if (delta == 0 || vscrollbar_ctrl == null || !vscrollbar_ctrl.Visible)
1861                                         return;
1862
1863                                 int max = vscrollbar_ctrl.Maximum;//- (page_size) + 1;
1864
1865                                 int val = vscrollbar_ctrl.Value + delta;
1866                                 if (val > max)
1867                                         val = max;
1868                                 else if (val < vscrollbar_ctrl.Minimum)
1869                                         val = vscrollbar_ctrl.Minimum;
1870                                 vscrollbar_ctrl.Value = val;
1871                         }
1872
1873                         private void OnMouseWheelCLB (object sender, MouseEventArgs me)
1874                         {
1875                                 if (owner.Items.Count == 0)
1876                                         return;
1877
1878                                 int lines = me.Delta / 120 * SystemInformation.MouseWheelScrollLines;
1879                                 Scroll (-lines);
1880                         }
1881
1882                         // Value Changed
1883                         private void VerticalScrollEvent (object sender, EventArgs e)
1884                         {
1885                                 if (top_item == vscrollbar_ctrl.Value)
1886                                         return;
1887
1888                                 top_item =  vscrollbar_ctrl.Value;
1889                                 UpdateLastVisibleItem ();
1890                                 Invalidate ();
1891                         }
1892
1893                         protected override void WndProc(ref Message m) {
1894                                 if (m.Msg == (int)Msg.WM_SETFOCUS) {
1895                                         if (m.WParam != IntPtr.Zero) {
1896                                                 XplatUI.SetFocus(m.WParam);
1897                                         }
1898                                 }
1899                                 base.WndProc (ref m);
1900                         }
1901
1902                         #endregion Private Methods
1903                 }
1904         }
1905 }
1906