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 TextBox textbox_ctrl;
  58                 private bool item_height_specified = false;
  59                 private int item_height;
  60                 private int requested_height = -1;
  61                 private Hashtable item_heights;
  62                 private bool show_dropdown_button = false;
  63                 private ButtonState button_state = ButtonState.Normal;
  64                 private bool dropped_down;
  65                 private Rectangle text_area;
  66                 private Rectangle button_area;
  67                 private Rectangle listbox_area;
  68                 private const int button_width = 16;
  69
  70                 [ComVisible(true)]
  71                 public class ChildAccessibleObject : AccessibleObject {
  72                         private ComboBox        owner;
  73                         private IntPtr          handle;
  74
  75                         public ChildAccessibleObject (ComboBox owner, IntPtr handle) {
  76                                 this.owner = owner;
  77                                 this.handle = handle;
  78                         }
  79
  80                         public override string Name {
  81                                 get {
  82                                         return base.Name;
  83                                 }
  84                         }
  85                 }
  86
  87                 public ComboBox ()
  88                 {
  89                         items = new ObjectCollection (this);
  90                         DropDownStyle = ComboBoxStyle.DropDown;
  91                         item_height = FontHeight + 2;
  92                         BackColor = ThemeEngine.Current.ColorWindow;
  93                         border_style = BorderStyle.None;
  94
  95                         /* Events */
  96                         MouseDown += new MouseEventHandler (OnMouseDownCB);
  97                         MouseUp += new MouseEventHandler (OnMouseUpCB);
  98                         MouseMove += new MouseEventHandler (OnMouseMoveCB);
  99                         KeyDown +=new KeyEventHandler(OnKeyDownCB);
 100                 }
 101
 102                 #region events
 103
 104                 [Browsable (false)]
 105                 [EditorBrowsable (EditorBrowsableState.Never)]
 106                 public new event EventHandler BackgroundImageChanged {
 107                         add { base.BackgroundImageChanged += value; }
 108                         remove { base.BackgroundImageChanged -= value; }
 109                 }
 110
 111                 public event DrawItemEventHandler DrawItem;
 112                 public event EventHandler DropDown;
 113                 public event EventHandler DropDownStyleChanged;
 114                 public event MeasureItemEventHandler MeasureItem;
 115
 116                 [Browsable (false)]
 117                 [EditorBrowsable (EditorBrowsableState.Never)]
 118                 public new event PaintEventHandler Paint {
 119                         add { base.Paint += value; }
 120                         remove { base.Paint -= value; }
 121                 }
 122
 123                 public event EventHandler SelectedIndexChanged;
 124                 public event EventHandler SelectionChangeCommitted;
 125                 #endregion Events
 126
 127                 #region Public Properties
 128                 public override Color BackColor {
 129                         get { return base.BackColor; }
 130                         set {
 131                                 if (base.BackColor == value)
 132                                         return;
 133
 134                                 base.BackColor = value;
 135                                 Refresh ();
 136                         }
 137                 }
 138
 139                 [Browsable (false)]
 140                 [EditorBrowsable (EditorBrowsableState.Never)]
 141                 public override Image BackgroundImage {
 142                         get { return base.BackgroundImage; }
 143                         set {
 144                                 if (base.BackgroundImage == value)
 145                                         return;
 146
 147                                 base.BackgroundImage = value;
 148                                 Refresh ();
 149                         }
 150                 }
 151
 152                 protected override CreateParams CreateParams {
 153                         get { return base.CreateParams;}
 154                 }
 155
 156                 protected override Size DefaultSize {
 157                         get { return new Size (121, 21); }
 158                 }
 159
 160                 [RefreshProperties(RefreshProperties.Repaint)]
 161                 [DefaultValue (DrawMode.Normal)]
 162                 public DrawMode DrawMode {
 163                         get { return draw_mode; }
 164
 165                         set {
 166                                 if (!Enum.IsDefined (typeof (DrawMode), value))
 167                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for DrawMode", value));
 168
 169                                 if (draw_mode == value)
 170                                         return;
 171
 172                                 if (draw_mode == DrawMode.OwnerDrawVariable)
 173                                         item_heights = null;
 174                                 draw_mode = value;
 175                                 if (draw_mode == DrawMode.OwnerDrawVariable)
 176                                         item_heights = new Hashtable ();
 177                                 Refresh ();
 178                         }
 179                 }
 180
 181                 [DefaultValue (ComboBoxStyle.DropDown)]
 182                 [RefreshProperties(RefreshProperties.Repaint)]
 183                 public ComboBoxStyle DropDownStyle {
 184                         get { return dropdown_style; }
 185
 186                         set {
 187
 188                                 if (!Enum.IsDefined (typeof (ComboBoxStyle), value))
 189                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for ComboBoxStyle", value));
 190
 191                                 if (dropdown_style == value)
 192                                         return;
 193
 194                                 if (dropdown_style == ComboBoxStyle.Simple) {
 195                                         if (listbox_ctrl != null) {
 196                                                 Controls.RemoveImplicit (listbox_ctrl);
 197                                                 listbox_ctrl.Dispose ();
 198                                                 listbox_ctrl = null;
 199                                         }
 200                                 }
 201
 202                                 dropdown_style = value;
 203
 204                                 if (dropdown_style == ComboBoxStyle.DropDownList && textbox_ctrl != null) {
 205                                         Controls.RemoveImplicit (textbox_ctrl);
 206                                         textbox_ctrl.Dispose ();
 207                                         textbox_ctrl = null;
 208                                 }
 209
 210                                 if (dropdown_style == ComboBoxStyle.Simple) {
 211                                         show_dropdown_button = false;
 212
 213                                         CreateComboListBox ();
 214
 215                                         if (IsHandleCreated)
 216                                                 Controls.AddImplicit (listbox_ctrl);
 217                                 } else {
 218                                         show_dropdown_button = true;
 219                                         button_state = ButtonState.Normal;
 220                                 }
 221
 222                                 if (dropdown_style != ComboBoxStyle.DropDownList && textbox_ctrl == null) {
 223                                         textbox_ctrl = new FixedSizeTextBox ();
 224                                         if (SelectedItem != null)
 225                                                 textbox_ctrl.Text = GetItemText (SelectedItem);
 226                                         textbox_ctrl.BorderStyle = BorderStyle.None;
 227                                         textbox_ctrl.TextChanged += new EventHandler (OnTextChangedEdit);
 228                                         textbox_ctrl.KeyPress += new KeyPressEventHandler(textbox_ctrl_KeyPress);
 229                                         textbox_ctrl.KeyDown += new KeyEventHandler (OnKeyDownCB);
 230                                         textbox_ctrl.GotFocus += new EventHandler(textbox_ctrl_GotFocus);
 231                                         textbox_ctrl.LostFocus += new EventHandler(textbox_ctrl_LostFocus);
 232                                         textbox_ctrl.MouseDown += new MouseEventHandler(textbox_ctrl_MouseDown);
 233                                         textbox_ctrl.MouseMove += new MouseEventHandler(textbox_ctrl_MouseMove);
 234                                         textbox_ctrl.MouseUp += new MouseEventHandler(textbox_ctrl_MouseUp);
 235
 236                                         if (IsHandleCreated == true) {
 237                                                 Controls.AddImplicit (textbox_ctrl);
 238                                         }
 239                                 }
 240
 241                                 OnDropDownStyleChanged (EventArgs.Empty);
 242
 243                                 Layout ();
 244                                 UpdateBounds ();
 245                                 Refresh ();
 246                         }
 247                 }
 248
 249                 public int DropDownWidth {
 250                         get {
 251                                 if (dropdown_width == -1)
 252                                         return Width;
 253
 254                                 return dropdown_width;
 255                         }
 256                         set {
 257                                 if (dropdown_width == value)
 258                                         return;
 259
 260                                 if (value < 1)
 261                                         throw new ArgumentException ("The DropDownWidth value is less than one");
 262
 263                                 dropdown_width = value;
 264                         }
 265                 }
 266
 267                 [Browsable (false)]
 268                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 269                 public bool DroppedDown {
 270                         get {
 271                                 if (dropdown_style == ComboBoxStyle.Simple)
 272                                         return true;
 273
 274                                 return dropped_down;
 275                         }
 276                         set {
 277                                 if (dropdown_style == ComboBoxStyle.Simple || dropped_down == value)
 278                                         return;
 279
 280                                 if (value)
 281                                         DropDownListBox ();
 282                                 else
 283                                         listbox_ctrl.Hide ();
 284                         }
 285                 }
 286
 287                 public override bool Focused {
 288                         get { return base.Focused; }
 289                 }
 290
 291                 public override Color ForeColor {
 292                         get { return base.ForeColor; }
 293                         set {
 294                                 if (base.ForeColor == value)
 295                                         return;
 296
 297                                 base.ForeColor = value;
 298                                 Refresh ();
 299                         }
 300                 }
 301
 302                 [DefaultValue (true)]
 303                 [Localizable (true)]
 304                 public bool IntegralHeight {
 305                         get { return integral_height; }
 306                         set {
 307                                 if (integral_height == value)
 308                                         return;
 309
 310                                 integral_height = value;
 311                                 UpdateBounds ();
 312                                 Refresh ();
 313                         }
 314                 }
 315
 316                 [Localizable (true)]
 317                 public int ItemHeight {
 318                         get {
 319                                 if (item_height == -1) {
 320                                         SizeF sz = DeviceContext.MeasureString ("The quick brown Fox", Font);
 321                                         item_height = (int) sz.Height;
 322                                 }
 323                                 return item_height;
 324                         }
 325                         set {
 326                                 if (value < 0)
 327                                         throw new ArgumentException ("The item height value is less than zero");
 328
 329                                 item_height_specified = true;
 330                                 item_height = value;
 331                                 if (IntegralHeight)
 332                                         UpdateBounds ();
 333                                 Layout ();
 334                                 Refresh ();
 335                         }
 336                 }
 337
 338                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 339                 [Localizable (true)]
 340                 [Editor ("System.Windows.Forms.Design.ListControlStringCollectionEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 341                 public ComboBox.ObjectCollection Items {
 342                         get { return items; }
 343                 }
 344
 345                 [DefaultValue (8)]
 346                 [Localizable (true)]
 347                 public int MaxDropDownItems {
 348                         get { return maxdrop_items; }
 349                         set {
 350                                 if (maxdrop_items == value)
 351                                         return;
 352
 353                                 maxdrop_items = value;
 354                         }
 355                 }
 356
 357                 [DefaultValue (0)]
 358                 [Localizable (true)]
 359                 public int MaxLength {
 360                         get { return max_length; }
 361                         set {
 362                                 if (max_length == value)
 363                                         return;
 364
 365                                 max_length = value;
 366
 367                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 368
 369                                         if (value < 0) {
 370                                                 value = 0;
 371                                         }
 372
 373                                         textbox_ctrl.MaxLength = value;
 374                                 }
 375                         }
 376                 }
 377
 378                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 379                 [Browsable (false)]
 380                 public int PreferredHeight {
 381                         get {
 382                                 return ItemHeight + 5;
 383                         }
 384                 }
 385
 386                 [Browsable (false)]
 387                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 388                 public override int SelectedIndex {
 389                         get { return selected_index; }
 390                         set {
 391                                 if (value <= -2 || value >= Items.Count)
 392                                         throw new ArgumentOutOfRangeException ("Index of out range");
 393
 394                                 selected_index = value;
 395
 396                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 397                                         if (selected_index == -1)
 398                                                 SetControlText (String.Empty);
 399                                         else {
 400                                                 SetControlText (GetItemText (items [value]));
 401                                                 SelectAll ();
 402                                         }
 403                                 }
 404
 405                                 OnSelectedValueChanged (new EventArgs ());
 406                                 OnSelectedIndexChanged  (new EventArgs ());
 407                                 OnSelectedItemChanged (new EventArgs ());
 408
 409                                 if (DropDownStyle == ComboBoxStyle.DropDownList)
 410                                         Refresh ();
 411
 412                                 if (listbox_ctrl != null)
 413                                         listbox_ctrl.HighlightedIndex = value;
 414                         }
 415                 }
 416
 417                 [Browsable (false)]
 418                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 419                 [Bindable(true)]
 420                 public object SelectedItem {
 421                         get {
 422                                 if (selected_index == -1)
 423                                         return null;
 424                                 return items [selected_index];
 425                         }
 426                         set {
 427                                 if (items [selected_index] == value)
 428                                         return;
 429
 430                                 if (value == null)
 431                                         SelectedIndex = -1;
 432                                 else
 433                                         SelectedIndex = items.IndexOf (value);
 434                         }
 435                 }
 436
 437                 [Browsable (false)]
 438                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 439                 public string SelectedText {
 440                         get {
 441                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 442                                         return "";
 443
 444                                 return textbox_ctrl.SelectedText;
 445                         }
 446                         set {
 447                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 448                                         return;
 449
 450                                 textbox_ctrl.SelectedText = value;
 451                         }
 452                 }
 453
 454                 [Browsable (false)]
 455                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 456                 public int SelectionLength {
 457                         get {
 458                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 459                                         return 0;
 460
 461                                 return textbox_ctrl.SelectionLength;
 462                         }
 463                         set {
 464                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 465                                         return;
 466
 467                                 if (textbox_ctrl.SelectionLength == value)
 468                                         return;
 469
 470                                 textbox_ctrl.SelectionLength = value;
 471                         }
 472                 }
 473
 474                 [Browsable (false)]
 475                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 476                 public int SelectionStart {
 477                         get {
 478                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 479                                         return 0;
 480
 481                                 return textbox_ctrl.SelectionStart;
 482                         }
 483                         set {
 484                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 485                                         return;
 486
 487                                 if (textbox_ctrl.SelectionStart == value)
 488                                         return;
 489
 490                                 textbox_ctrl.SelectionStart = value;
 491                         }
 492                 }
 493
 494                 [DefaultValue (false)]
 495                 public bool Sorted {
 496                         get { return sorted; }
 497
 498                         set {
 499                                 if (sorted == value)
 500                                         return;
 501
 502                                 sorted = value;
 503                         }
 504                 }
 505
 506                 [Bindable (true)]
 507                 [Localizable (true)]
 508                 public override string Text {
 509                         get {
 510                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 511                                         if (textbox_ctrl != null) {
 512                                                 return textbox_ctrl.Text;
 513                                         }
 514                                 }
 515
 516                                 if (SelectedItem != null)
 517                                         return GetItemText (SelectedItem);
 518
 519                                 return base.Text;
 520                         }
 521                         set {
 522                                 if (value == null) {
 523                                         SelectedIndex = -1;
 524                                         return;
 525                                 }
 526
 527                                 int index = FindString (value);
 528
 529                                 if (index != -1) {
 530                                         SelectedIndex = index;
 531                                 }
 532
 533                                 if (dropdown_style != ComboBoxStyle.DropDownList)
 534                                         textbox_ctrl.Text = GetItemText (value);
 535                         }
 536                 }
 537
 538                 #endregion Public Properties
 539
 540                 #region Public Methods
 541                 protected virtual void AddItemsCore (object[] value)
 542                 {
 543
 544                 }
 545
 546                 public void BeginUpdate ()
 547                 {
 548                         suspend_ctrlupdate = true;
 549                 }
 550
 551                 protected override void Dispose (bool disposing)
 552                 {
 553                         if (disposing) {
 554                                 if (listbox_ctrl != null) {
 555                                         listbox_ctrl.Dispose ();
 556                                         Controls.RemoveImplicit (listbox_ctrl);
 557                                         listbox_ctrl = null;
 558                                 }
 559
 560                                 if (textbox_ctrl != null) {
 561                                         Controls.RemoveImplicit (textbox_ctrl);
 562                                         textbox_ctrl.Dispose ();
 563                                         textbox_ctrl = null;
 564                                 }
 565                         }
 566
 567                         base.Dispose (disposing);
 568                 }
 569
 570                 public void EndUpdate ()
 571                 {
 572                         suspend_ctrlupdate = false;
 573                         UpdatedItems ();
 574                         Refresh ();
 575                 }
 576
 577                 public int FindString (string s)
 578                 {
 579                         return FindString (s, -1);
 580                 }
 581
 582                 public int FindString (string s, int startIndex)
 583                 {
 584                         if (Items.Count == 0)
 585                                 return -1; // No exception throwing if empty
 586
 587                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 588                                 throw new  ArgumentOutOfRangeException ("Index of out range");
 589
 590                         startIndex++;
 591                         for (int i = startIndex; i < Items.Count; i++) {
 592                                 if ((GetItemText (Items[i])).StartsWith (s))
 593                                         return i;
 594                         }
 595
 596                         return -1;
 597                 }
 598
 599                 public int FindStringExact (string s)
 600                 {
 601                         return FindStringExact (s, -1);
 602                 }
 603
 604                 public int FindStringExact (string s, int startIndex)
 605                 {
 606                         if (Items.Count == 0)
 607                                 return -1; // No exception throwing if empty
 608
 609                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 610                                 throw new ArgumentOutOfRangeException ("Index of out range");
 611
 612                         startIndex++;
 613                         for (int i = startIndex; i < Items.Count; i++) {
 614                                 if ((GetItemText (Items[i])).Equals (s))
 615                                         return i;
 616                         }
 617
 618                         return -1;
 619                 }
 620
 621                 public int GetItemHeight (int index)
 622                 {
 623                         if (DrawMode == DrawMode.OwnerDrawVariable && IsHandleCreated) {
 624
 625                                 if (index < 0 || index >= Items.Count )
 626                                         throw new ArgumentOutOfRangeException ("The item height value is less than zero");
 627
 628                                 object item = Items [index];
 629                                 if (item_heights.Contains (item))
 630                                         return (int) item_heights [item];
 631
 632                                 MeasureItemEventArgs args = new MeasureItemEventArgs (DeviceContext, index, ItemHeight);
 633                                 OnMeasureItem (args);
 634                                 item_heights [item] = args.ItemHeight;
 635                                 return args.ItemHeight;
 636                         }
 637
 638                         return ItemHeight;
 639                 }
 640
 641                 protected override bool IsInputKey (Keys keyData)
 642                 {
 643                         switch (keyData) {
 644                         case Keys.Up:
 645                         case Keys.Down:
 646                         case Keys.PageUp:
 647                         case Keys.PageDown:
 648                                 return true;
 649
 650                         default:
 651                                 return false;
 652                         }
 653                 }
 654
 655                 protected override void OnBackColorChanged (EventArgs e)
 656                 {
 657                         base.OnBackColorChanged (e);
 658                 }
 659
 660                 protected override void OnDataSourceChanged (EventArgs e)
 661                 {
 662                         base.OnDataSourceChanged (e);
 663                         BindDataItems (items);
 664
 665                         if (DataSource == null || DataManager == null) {
 666                                 SelectedIndex = -1;
 667                         }
 668                         else {
 669                                 SelectedIndex = DataManager.Position;
 670                         }
 671                 }
 672
 673                 protected override void OnDisplayMemberChanged (EventArgs e)
 674                 {
 675                         base.OnDisplayMemberChanged (e);
 676
 677                         if (DataManager == null || !IsHandleCreated)
 678                                return;
 679
 680                         BindDataItems (items);
 681                         SelectedIndex = DataManager.Position;
 682                 }
 683
 684                 protected virtual void OnDrawItem (DrawItemEventArgs e)
 685                 {
 686                         switch (DrawMode) {
 687                         case DrawMode.OwnerDrawFixed:
 688                         case DrawMode.OwnerDrawVariable:
 689                                 if (DrawItem != null)
 690                                         DrawItem (this, e);
 691                                 break;
 692                         default:
 693                                 ThemeEngine.Current.DrawComboBoxItem (this, e);
 694                                 break;
 695                         }
 696                 }
 697
 698                 protected virtual void OnDropDown (EventArgs e)
 699                 {
 700                         if (DropDown != null)
 701                                 DropDown (this, e);
 702                 }
 703
 704                 protected virtual void OnDropDownStyleChanged (EventArgs e)
 705                 {
 706                         if (DropDownStyleChanged != null)
 707                                 DropDownStyleChanged (this, e);
 708                 }
 709
 710                 protected override void OnFontChanged (EventArgs e)
 711                 {
 712                         base.OnFontChanged (e);
 713
 714                         if (textbox_ctrl != null)
 715                                 textbox_ctrl.Font = Font;
 716
 717                         if (!item_height_specified) {
 718                                 SizeF sz = DeviceContext.MeasureString ("The quick brown Fox", Font);
 719                                 item_height = (int) sz.Height;
 720                         }
 721
 722                         if (IntegralHeight)
 723                                 UpdateBounds ();
 724
 725                         Layout ();
 726                 }
 727
 728                 protected override void OnForeColorChanged (EventArgs e)
 729                 {
 730                         base.OnForeColorChanged (e);
 731                 }
 732
 733                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 734                 protected override void OnGotFocus (EventArgs e) {
 735                         Invalidate ();
 736
 737                         if (dropdown_style == ComboBoxStyle.Simple)
 738                                 listbox_ctrl.Focus ();
 739                         else if (dropdown_style != ComboBoxStyle.DropDownList && textbox_ctrl != null)
 740                                 textbox_ctrl.Focus ();
 741                         base.OnGotFocus (e);
 742                 }
 743
 744                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 745                 protected override void OnLostFocus (EventArgs e) {
 746                         base.OnLostFocus (e);
 747                 }
 748
 749                 protected override void OnHandleCreated (EventArgs e)
 750                 {
 751                         base.OnHandleCreated (e);
 752
 753                         if (listbox_ctrl != null)
 754                                 Controls.AddImplicit (listbox_ctrl);
 755
 756                         if (textbox_ctrl != null)
 757                                 Controls.AddImplicit (textbox_ctrl);
 758
 759                         Layout ();
 760                 }
 761
 762                 protected override void OnHandleDestroyed (EventArgs e)
 763                 {
 764                         base.OnHandleDestroyed (e);
 765                 }
 766
 767                 protected override void OnKeyPress (KeyPressEventArgs e)
 768                 {
 769                         int index= FindStringCaseInsensitive (e.KeyChar.ToString (), SelectedIndex + 1);
 770                         if (index == -1)
 771                                 return;
 772                         SelectedIndex = index;
 773
 774                         base.OnKeyPress (e);
 775                 }
 776
 777                 protected virtual void OnMeasureItem (MeasureItemEventArgs e)
 778                 {
 779                         if (MeasureItem != null)
 780                                 MeasureItem (this, e);
 781                 }
 782
 783                 protected override void OnParentBackColorChanged (EventArgs e)
 784                 {
 785                         base.OnParentBackColorChanged (e);
 786                 }
 787
 788                 protected override void OnResize (EventArgs e)
 789                 {
 790                         Layout ();
 791                         if (listbox_ctrl != null)
 792                                 listbox_ctrl.CalcListBoxArea ();
 793                 }
 794
 795                 protected override void OnSelectedIndexChanged (EventArgs e)
 796                 {
 797                         base.OnSelectedIndexChanged (e);
 798
 799                         if (SelectedIndexChanged != null)
 800                                 SelectedIndexChanged (this, e);
 801                 }
 802
 803                 protected virtual void OnSelectedItemChanged (EventArgs e)
 804                 {
 805
 806                 }
 807
 808                 protected override void OnSelectedValueChanged (EventArgs e)
 809                 {
 810                         base.OnSelectedValueChanged (e);
 811                 }
 812
 813                 protected virtual void OnSelectionChangeCommitted (EventArgs e)
 814                 {
 815                         if (SelectionChangeCommitted != null)
 816                                 SelectionChangeCommitted (this, e);
 817                 }
 818
 819                 protected override void RefreshItem (int index)
 820                 {
 821                         if (index < 0 || index >= Items.Count)
 822                                 throw new ArgumentOutOfRangeException ("Index of out range");
 823
 824                         if (draw_mode == DrawMode.OwnerDrawVariable)
 825                                 item_heights.Remove (Items [index]);
 826                 }
 827
 828                 public void Select (int start, int length)
 829                 {
 830                         if (start < 0)
 831                                 throw new ArgumentException ("Start cannot be less than zero");
 832
 833                         if (length < 0)
 834                                 throw new ArgumentException ("length cannot be less than zero");
 835
 836                         if (dropdown_style == ComboBoxStyle.DropDownList)
 837                                 return;
 838
 839                         textbox_ctrl.Select (start, length);
 840                 }
 841
 842                 public void SelectAll ()
 843                 {
 844                         if (dropdown_style == ComboBoxStyle.DropDownList)
 845                                 return;
 846
 847                         textbox_ctrl.SelectAll ();
 848                 }
 849
 850                 protected override void SetBoundsCore (int x, int y, int width, int height, BoundsSpecified specified)
 851                 {
 852                         if ((specified & BoundsSpecified.Height) != 0) {
 853                                 requested_height = height;
 854
 855                                 if (DropDownStyle == ComboBoxStyle.Simple && height > PreferredHeight) {
 856                                         if (IntegralHeight) {
 857                                                 int border = ThemeEngine.Current.Border3DSize.Height;
 858                                                 int lb_height = height - PreferredHeight - 2;
 859                                                 if (lb_height - 2 * border > ItemHeight) {
 860                                                         int partial = (lb_height - 2 * border) % ItemHeight;
 861                                                         height -= partial;
 862                                                 } else
 863                                                         height = PreferredHeight;
 864                                         }
 865                                 } else
 866                                         height = PreferredHeight;
 867                         }
 868
 869                         base.SetBoundsCore (x, y, width, height, specified);
 870                 }
 871
 872                 protected override void SetItemCore (int index, object value)
 873                 {
 874                         if (index < 0 || index >= Items.Count)
 875                                 return;
 876
 877                         Items[index] = value;
 878                 }
 879
 880                 protected override void SetItemsCore (IList value)
 881                 {
 882                         BeginUpdate ();
 883                         try {
 884                                 Items.Clear ();
 885                                 Items.AddRange (value);
 886                         } finally {
 887                                 EndUpdate ();
 888                         }
 889                 }
 890
 891                 public override string ToString ()
 892                 {
 893                         return base.ToString () + ", Items.Count:" + Items.Count;
 894                 }
 895
 896                 protected override void WndProc (ref Message m)
 897                 {
 898                         switch ((Msg) m.Msg) {
 899                         case Msg.WM_MOUSE_LEAVE:
 900                                 Point location = PointToClient (Control.MousePosition);
 901                                 if (ClientRectangle.Contains (location))
 902                                         return;
 903                                 break;
 904                         default:
 905                                 break;
 906                         }
 907                         base.WndProc (ref m);
 908                 }
 909
 910                 #endregion Public Methods
 911
 912                 #region Private Methods
 913
 914                 internal override bool InternalCapture {
 915                         get { return Capture; }
 916                         set {}
 917                 }
 918
 919                 private void textbox_ctrl_KeyPress(object sender, KeyPressEventArgs e)
 920                 {
 921                         OnKeyPress (e);
 922                 }
 923
 924                 private void textbox_ctrl_GotFocus(object sender, EventArgs e )
 925                 {
 926                         OnGotFocus(e);
 927                 }
 928
 929                 private void textbox_ctrl_LostFocus(object sender, EventArgs e )
 930                 {
 931                         OnLostFocus(e);
 932                 }
 933
 934                 private void textbox_ctrl_MouseDown(object sender, MouseEventArgs e )
 935                 {
 936                         OnMouseDown(e);
 937                 }
 938
 939                 private void textbox_ctrl_MouseMove(object sender, MouseEventArgs e )
 940                 {
 941                         OnMouseMove(e);
 942                 }
 943
 944                 private void textbox_ctrl_MouseUp(object sender, MouseEventArgs e )
 945                 {
 946                         OnMouseUp(e);
 947                 }
 948
 949                 void Layout ()
 950                 {
 951                         int border = ThemeEngine.Current.Border3DSize.Width;
 952
 953                         text_area = ClientRectangle;
 954                         text_area.Height = PreferredHeight;
 955
 956                         listbox_area = ClientRectangle;
 957                         listbox_area.Y = text_area.Bottom + 3;
 958                         listbox_area.Height -= (text_area.Height + 2);
 959
 960                         Rectangle prev_button_area = button_area;
 961
 962                         if (DropDownStyle == ComboBoxStyle.Simple)
 963                                 button_area = Rectangle.Empty;
 964                         else {
 965                                 button_area = text_area;
 966                                 button_area.X = text_area.Right - button_width - border;
 967                                 button_area.Y = text_area.Y + border;
 968                                 button_area.Width = button_width;
 969                                 button_area.Height = text_area.Height - 2 * border;
 970                         }
 971
 972                         if (button_area != prev_button_area) {
 973                                 prev_button_area.Y -= border;
 974                                 prev_button_area.Width += border;
 975                                 prev_button_area.Height += 2 * border;
 976                                 Invalidate (prev_button_area);
 977                                 Invalidate (button_area);
 978                         }
 979
 980                         if (textbox_ctrl != null) {
 981                                 textbox_ctrl.Location = new Point (text_area.X + border, text_area.Y + border);
 982                                 textbox_ctrl.Width = text_area.Width - button_area.Width - border * 2;
 983                                 textbox_ctrl.Height = text_area.Height - border * 2;
 984                         }
 985
 986                         if (listbox_ctrl != null && dropdown_style == ComboBoxStyle.Simple) {
 987                                 listbox_ctrl.Location = listbox_area.Location;
 988                                 listbox_ctrl.CalcListBoxArea ();
 989                         }
 990                 }
 991
 992                 private void CreateComboListBox ()
 993                 {
 994                         listbox_ctrl = new ComboListBox (this);
 995                         if (selected_index != -1)
 996                                 listbox_ctrl.HighlightedIndex = selected_index;
 997                 }
 998
 999                 internal void Draw (Rectangle clip, Graphics dc)
1000                 {
1001                         Theme theme = ThemeEngine.Current;
1002
1003                         if (DropDownStyle == ComboBoxStyle.Simple)
1004                                 dc.FillRectangle (theme.ResPool.GetSolidBrush (Parent.BackColor), ClientRectangle);
1005
1006                         if (clip.IntersectsWith (text_area))
1007                                 ControlPaint.DrawBorder3D (dc, text_area, Border3DStyle.Sunken);
1008
1009                         int border = theme.Border3DSize.Width;
1010
1011                         // No edit control, we paint the edit ourselves
1012                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1013                                 DrawItemState state = DrawItemState.None;
1014                                 Rectangle item_rect = text_area;
1015                                 item_rect.X += border;
1016                                 item_rect.Y += border;
1017                                 item_rect.Width -= (button_area.Width + 2 * border);
1018                                 item_rect.Height -= 2 * border;
1019
1020                                 if (has_focus) {
1021                                         state = DrawItemState.Selected;
1022                                         state |= DrawItemState.Focus;
1023                                 }
1024
1025                                 state |= DrawItemState.ComboBoxEdit;
1026                                 OnDrawItem (new DrawItemEventArgs (dc, Font, item_rect, SelectedIndex, state, ForeColor, BackColor));
1027                         }
1028
1029                         if (show_dropdown_button) {
1030                                 dc.FillRectangle (theme.ResPool.GetSolidBrush (theme.ColorControl), button_area);
1031
1032                                 if (!is_enabled)
1033                                         button_state = ButtonState.Inactive;
1034
1035                                 theme.CPDrawComboButton (dc, button_area, button_state);
1036                         }
1037                 }
1038
1039                 internal void DropDownListBox ()
1040                 {
1041                         if (DropDownStyle == ComboBoxStyle.Simple)
1042                                 return;
1043
1044                         if (listbox_ctrl == null)
1045                                 CreateComboListBox ();
1046
1047                         listbox_ctrl.Location = PointToScreen (new Point (text_area.X, text_area.Y + text_area.Height));
1048
1049                         if (listbox_ctrl.ShowWindow ())
1050                                 dropped_down = true;
1051
1052                         button_state = ButtonState.Pushed;
1053                         if (dropdown_style == ComboBoxStyle.DropDownList)
1054                                 Invalidate (text_area);
1055
1056                         OnDropDown (EventArgs.Empty);
1057                 }
1058
1059                 internal void DropDownListBoxFinished ()
1060                 {
1061                         if (DropDownStyle == ComboBoxStyle.Simple)
1062                                 return;
1063
1064                         button_state = ButtonState.Normal;
1065                         Invalidate (button_area);
1066                         dropped_down = false;
1067                 }
1068
1069                 private int FindStringCaseInsensitive (string search)
1070                 {
1071                         if (search.Length == 0) {
1072                                 return -1;
1073                         }
1074
1075                         for (int i = 0; i < Items.Count; i++)
1076                         {
1077                                 if (String.Compare (GetItemText (Items[i]), 0, search, 0, search.Length, true) == 0)
1078                                         return i;
1079                         }
1080
1081                         return -1;
1082                 }
1083
1084                 internal int FindStringCaseInsensitive (string search, int start_index)
1085                 {
1086                         if (search.Length == 0) {
1087                                 return -1;
1088                         }
1089
1090                         for (int i = 0; i < Items.Count; i++) {
1091                                 int index = (i + start_index) % Items.Count;
1092                                 if (String.Compare (GetItemText (Items [index]), 0, search, 0, search.Length, true) == 0)
1093                                         return index;
1094                         }
1095
1096                         return -1;
1097                 }
1098
1099                 private void OnKeyDownCB(object sender, KeyEventArgs e)
1100                 {
1101                         if (Items.Count == 0)
1102                                 return;
1103
1104                         switch (e.KeyCode)
1105                         {
1106                                 case Keys.Up:
1107                                         SelectedIndex = Math.Max(SelectedIndex-1, 0);
1108                                         break;
1109
1110                                 case Keys.Down:
1111                                         SelectedIndex = Math.Min(SelectedIndex+1, Items.Count-1);
1112                                         break;
1113
1114                                 case Keys.PageUp:
1115                                         if (listbox_ctrl != null)
1116                                                 SelectedIndex = Math.Max(SelectedIndex- (listbox_ctrl.page_size-1), 0);
1117                                         break;
1118
1119                                 case Keys.PageDown:
1120                                         if (listbox_ctrl != null)
1121                                                 SelectedIndex = Math.Min(SelectedIndex+(listbox_ctrl.page_size-1), Items.Count-1);
1122                                         break;
1123
1124                                 default:
1125                                         break;
1126                         }
1127                 }
1128
1129                 void OnMouseDownCB (object sender, MouseEventArgs e)
1130                 {
1131                         Rectangle area;
1132                         if (DropDownStyle == ComboBoxStyle.DropDownList)
1133                                 area = ClientRectangle;
1134                         else
1135                                 area = button_area;
1136
1137                         if (area.Contains (e.X, e.Y)) {
1138                                 DropDownListBox ();
1139                                 Invalidate (button_area);
1140                                 Update ();
1141                         }
1142                         Capture = true;
1143                 }
1144
1145                 void OnMouseMoveCB (object sender, MouseEventArgs e)
1146                 {
1147                         if (DropDownStyle == ComboBoxStyle.Simple)
1148                                 return;
1149
1150                         if (listbox_ctrl != null && listbox_ctrl.Visible) {
1151                                 Point location = listbox_ctrl.PointToClient (Control.MousePosition);
1152                                 if (listbox_ctrl.ClientRectangle.Contains (location))
1153                                         listbox_ctrl.Capture = true;
1154                         }
1155                 }
1156
1157                 void OnMouseUpCB (object sender, MouseEventArgs e)
1158                 {
1159                         Capture = false;
1160                         OnClick (EventArgs.Empty);
1161
1162                         if (dropped_down)
1163                                 listbox_ctrl.Capture = true;
1164                 }
1165
1166                 internal override void OnPaintInternal (PaintEventArgs pevent)
1167                 {
1168                         if (suspend_ctrlupdate)
1169                                 return;
1170
1171                         Draw (ClientRectangle, pevent.Graphics);
1172                 }
1173
1174                 private void OnTextChangedEdit (object sender, EventArgs e)
1175                 {
1176                         int item = FindStringCaseInsensitive (textbox_ctrl.Text);
1177
1178                         if (item == -1 && listbox_ctrl != null) {
1179                                 listbox_ctrl.SetTopItem (item);
1180                                 listbox_ctrl.HighlightedIndex = item;
1181                         }
1182
1183                         base.Text = textbox_ctrl.Text;
1184                 }
1185
1186                 internal void SetControlText (string s)
1187                 {
1188                         textbox_ctrl.Text = s;
1189                 }
1190
1191                 void UpdateBounds ()
1192                 {
1193                         if (requested_height != -1)
1194                                 SetBoundsCore (0, 0, 0, requested_height, BoundsSpecified.Height);
1195                 }
1196
1197                 private void UpdatedItems ()
1198                 {
1199                         if (listbox_ctrl != null) {
1200                                 listbox_ctrl.UpdateLastVisibleItem ();
1201                                 listbox_ctrl.CalcListBoxArea ();
1202                                 listbox_ctrl.Refresh ();
1203                         }
1204                 }
1205
1206                 #endregion Private Methods
1207
1208                 [ListBindableAttribute (false)]
1209                 public class ObjectCollection : IList, ICollection, IEnumerable
1210                 {
1211
1212                         private ComboBox owner;
1213                         internal ArrayList object_items = new ArrayList ();
1214
1215                         public ObjectCollection (ComboBox owner)
1216                         {
1217                                 this.owner = owner;
1218                         }
1219
1220                         #region Public Properties
1221                         public int Count {
1222                                 get { return object_items.Count; }
1223                         }
1224
1225                         public bool IsReadOnly {
1226                                 get { return false; }
1227                         }
1228
1229                         [Browsable (false)]
1230                         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
1231                         public virtual object this [int index] {
1232                                 get {
1233                                         if (index < 0 || index >= Count)
1234                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1235
1236                                         return object_items[index];
1237                                 }
1238                                 set {
1239                                         if (index < 0 || index >= Count)
1240                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1241
1242                                         object_items[index] = value;
1243                                 }
1244                         }
1245
1246                         bool ICollection.IsSynchronized {
1247                                 get { return false; }
1248                         }
1249
1250                         object ICollection.SyncRoot {
1251                                 get { return this; }
1252                         }
1253
1254                         bool IList.IsFixedSize {
1255                                 get { return false; }
1256                         }
1257
1258                         #endregion Public Properties
1259
1260                         #region Private Properties
1261                         internal ArrayList ObjectItems {
1262                                 get { return object_items;}
1263                                 set {
1264                                         object_items = value;
1265                                 }
1266                         }
1267
1268                         #endregion Private Properties
1269
1270                         #region Public Methods
1271                         public int Add (object item)
1272                         {
1273                                 int idx;
1274
1275                                 idx = AddItem (item);
1276                                 owner.UpdatedItems ();
1277                                 return idx;
1278                         }
1279
1280                         public void AddRange (object[] items)
1281                         {
1282                                 foreach (object mi in items)
1283                                         AddItem (mi);
1284
1285                                 owner.UpdatedItems ();
1286                         }
1287
1288                         public void Clear ()
1289                         {
1290                                 owner.selected_index = -1;
1291                                 object_items.Clear ();
1292                                 owner.UpdatedItems ();
1293                                 owner.Refresh ();
1294                         }
1295
1296                         public bool Contains (object obj)
1297                         {
1298                                 return object_items.Contains (obj);
1299                         }
1300
1301                         public void CopyTo (object[] dest, int arrayIndex)
1302                         {
1303                                 object_items.CopyTo (dest, arrayIndex);
1304                         }
1305
1306                         void ICollection.CopyTo (Array dest, int index)
1307                         {
1308                                 object_items.CopyTo (dest, index);
1309                         }
1310
1311                         public IEnumerator GetEnumerator ()
1312                         {
1313                                 return object_items.GetEnumerator ();
1314                         }
1315
1316                         int IList.Add (object item)
1317                         {
1318                                 return Add (item);
1319                         }
1320
1321                         public int IndexOf (object value)
1322                         {
1323                                 return object_items.IndexOf (value);
1324                         }
1325
1326                         public void Insert (int index,  object item)
1327                         {
1328                                 if (index < 0 || index > Count)
1329                                         throw new ArgumentOutOfRangeException ("Index of out range");
1330
1331                                 owner.BeginUpdate ();
1332
1333                                 object_items.Insert (index, item);
1334
1335                                 owner.EndUpdate ();     // Calls UpdatedItems
1336                         }
1337
1338                         public void Remove (object value)
1339                         {
1340                                 if (IndexOf (value) == owner.SelectedIndex)
1341                                         owner.SelectedItem = null;
1342
1343                                 RemoveAt (IndexOf (value));
1344
1345                         }
1346
1347                         public void RemoveAt (int index)
1348                         {
1349                                 if (index < 0 || index >= Count)
1350                                         throw new ArgumentOutOfRangeException ("Index of out range");
1351
1352                                 if (index == owner.SelectedIndex)
1353                                         owner.SelectedItem = null;
1354
1355                                 object_items.RemoveAt (index);
1356                                 owner.UpdatedItems ();
1357                         }
1358                         #endregion Public Methods
1359
1360                         #region Private Methods
1361                         private int AddItem (object item)
1362                         {
1363                                 int cnt = object_items.Count;
1364                                 object_items.Add (item);
1365                                 return cnt;
1366                         }
1367
1368                         internal void AddRange (IList items)
1369                         {
1370                                 foreach (object mi in items)
1371                                         AddItem (mi);
1372
1373                                 owner.UpdatedItems ();
1374                         }
1375
1376                         #endregion Private Methods
1377                 }
1378
1379                 internal class ComboListBox : Control
1380                 {
1381                         private ComboBox owner;
1382                         private VScrollBarLB vscrollbar_ctrl;
1383                         private int top_item;                   /* First item that we show the in the current page */
1384                         private int last_item;                  /* Last visible item */
1385                         internal int page_size;                 /* Number of listbox items per page */
1386                         private Rectangle textarea_drawable;    /* Rectangle of the drawable text area */
1387
1388                         internal enum ItemNavigation
1389                         {
1390                                 First,
1391                                 Last,
1392                                 Next,
1393                                 Previous,
1394                                 NextPage,
1395                                 PreviousPage,
1396                         }
1397
1398                         class VScrollBarLB : VScrollBar
1399                         {
1400                                 public VScrollBarLB ()
1401                                 {
1402                                 }
1403
1404                                 internal override bool InternalCapture {
1405                                         get { return Capture; }
1406                                         set { }
1407                                 }
1408
1409                                 public bool FireMouseDown (MouseEventArgs e)
1410                                 {
1411                                         if (Visible) {
1412                                                 e = TranslateEvent (e);
1413                                                 if (ClientRectangle.Contains (e.X, e.Y)) {
1414                                                         OnMouseDown (e);
1415                                                         return true;
1416                                                 }
1417                                         }
1418                                         return false;
1419                                 }
1420
1421                                 public void FireMouseUp (MouseEventArgs e)
1422                                 {
1423                                         if (Visible) {
1424                                                 e = TranslateEvent (e);
1425                                                 if (ClientRectangle.Contains (e.X, e.Y))
1426                                                         OnMouseUp (e);
1427                                         }
1428                                 }
1429
1430                                 public void FireMouseMove (MouseEventArgs e)
1431                                 {
1432                                         if (Visible) {
1433                                                 e = TranslateEvent (e);
1434                                                 if (ClientRectangle.Contains (e.X, e.Y))
1435                                                         OnMouseMove (e);
1436                                         }
1437                                 }
1438
1439                                 MouseEventArgs TranslateEvent (MouseEventArgs e)
1440                                 {
1441                                         Point loc = PointToClient (Control.MousePosition);
1442                                         return new MouseEventArgs (e.Button, e.Clicks, loc.X, loc.Y, e.Delta);
1443                                 }
1444                         }
1445
1446                         public ComboListBox (ComboBox owner)
1447                         {
1448                                 this.owner = owner;
1449                                 top_item = 0;
1450                                 last_item = 0;
1451                                 page_size = 0;
1452
1453                                 MouseDown += new MouseEventHandler (OnMouseDownPUW);
1454                                 MouseUp += new MouseEventHandler (OnMouseUpPUW);
1455                                 MouseMove += new MouseEventHandler (OnMouseMovePUW);
1456                                 MouseWheel += new MouseEventHandler (OnMouseWheelCLB);
1457                                 KeyDown += new KeyEventHandler (OnKeyDownPUW);
1458                                 SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
1459                                 SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
1460
1461                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1462                                         InternalBorderStyle = BorderStyle.Fixed3D;
1463                                 else
1464                                         InternalBorderStyle = BorderStyle.FixedSingle;
1465                         }
1466
1467                         protected override CreateParams CreateParams
1468                         {
1469                                 get {
1470                                         CreateParams cp = base.CreateParams;
1471                                         if (owner == null || owner.DropDownStyle == ComboBoxStyle.Simple)
1472                                                 return cp;
1473
1474                                         cp.Style ^= (int) WindowStyles.WS_CHILD;
1475                                         cp.Style |= (int) WindowStyles.WS_POPUP;
1476                                         cp.ExStyle |= (int) WindowExStyles.WS_EX_TOOLWINDOW | (int) WindowExStyles.WS_EX_TOPMOST;
1477                                         return cp;
1478                                 }
1479                         }
1480
1481                         internal override bool InternalCapture {
1482                                 get {
1483                                         return Capture;
1484                                 }
1485
1486                                 set {
1487                                 }
1488                         }
1489
1490                         protected override void OnLostFocus(EventArgs e) {
1491                                 if (Capture) {
1492                                         HideWindow();
1493                                 }
1494                                 base.OnLostFocus (e);
1495                         }
1496
1497
1498                         int BorderWidth {
1499                                 get {
1500                                         switch (border_style) {
1501                                         case BorderStyle.Fixed3D:
1502                                                 return ThemeEngine.Current.Border3DSize.Width;
1503                                         default:
1504                                                 return ThemeEngine.Current.BorderSize.Width;
1505                                         }
1506                                 }
1507                         }
1508
1509                         #region Private Methods
1510                         // Calcs the listbox area
1511                         internal void CalcListBoxArea ()
1512                         {
1513                                 int width, height;
1514                                 bool show_scrollbar = false;
1515
1516                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1517                                         Rectangle area = owner.listbox_area;
1518                                         width = area.Width;
1519                                         height = area.Height;
1520                                 }
1521                                 else { // DropDown or DropDownList
1522
1523                                         width = owner.DropDownWidth;
1524                                         int count = (owner.Items.Count <= owner.MaxDropDownItems) ? owner.Items.Count : owner.MaxDropDownItems;
1525
1526                                         if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1527                                                 height = 0;
1528                                                 for (int i = 0; i < count; i++) {
1529                                                         height += owner.GetItemHeight (i);
1530                                                 }
1531
1532                                         } else  {
1533                                                 height = owner.ItemHeight * count;
1534                                         }
1535                                 }
1536
1537                                 if (owner.Items.Count <= owner.MaxDropDownItems) {
1538                                         if (vscrollbar_ctrl != null)
1539                                                 vscrollbar_ctrl.Visible = false;
1540                                 } else {
1541                                         /* Need vertical scrollbar */
1542                                         if (vscrollbar_ctrl == null) {
1543                                                 vscrollbar_ctrl = new VScrollBarLB ();
1544                                                 vscrollbar_ctrl.Minimum = 0;
1545                                                 vscrollbar_ctrl.SmallChange = 1;
1546                                                 vscrollbar_ctrl.LargeChange = 1;
1547                                                 vscrollbar_ctrl.Maximum = 0;
1548                                                 vscrollbar_ctrl.ValueChanged += new EventHandler (VerticalScrollEvent);
1549                                                 Controls.AddImplicit (vscrollbar_ctrl);
1550                                         }
1551
1552                                         vscrollbar_ctrl.Height = height - 2 * BorderWidth;
1553
1554                                         vscrollbar_ctrl.Location = new Point (width - vscrollbar_ctrl.Width - BorderWidth - 1, 0);
1555
1556                                         vscrollbar_ctrl.Maximum = owner.Items.Count - (owner.DropDownStyle == ComboBoxStyle.Simple ? page_size : owner.maxdrop_items);
1557                                         show_scrollbar = vscrollbar_ctrl.Visible = true;
1558
1559                                         int hli = HighlightedIndex;
1560                                         if (hli > 0) {
1561                                                 hli = Math.Min (hli, vscrollbar_ctrl.Maximum);
1562                                                 vscrollbar_ctrl.Value = hli;
1563                                         }
1564                                 }
1565
1566                                 Size = new Size (width, height);
1567                                 textarea_drawable = ClientRectangle;
1568                                 textarea_drawable.Width = width;
1569                                 textarea_drawable.Height = height;
1570
1571                                 if (vscrollbar_ctrl != null && show_scrollbar)
1572                                         textarea_drawable.Width -= vscrollbar_ctrl.Width;
1573
1574                                 last_item = LastVisibleItem ();
1575                                 page_size = textarea_drawable.Height / owner.ItemHeight;
1576                         }
1577
1578                         private void Draw (Rectangle clip, Graphics dc)
1579                         {
1580                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (owner.BackColor), clip);
1581
1582                                 if (owner.Items.Count > 0) {
1583
1584                                         for (int i = top_item; i <= last_item; i++) {
1585                                                 Rectangle item_rect = GetItemDisplayRectangle (i, top_item);
1586
1587                                                 if (!clip.IntersectsWith (item_rect))
1588                                                         continue;
1589
1590                                                 DrawItemState state = DrawItemState.None;
1591
1592                                                 if (i == HighlightedIndex) {
1593                                                         state |= DrawItemState.Selected;
1594
1595                                                         if (owner.DropDownStyle == ComboBoxStyle.DropDownList) {
1596                                                                 state |= DrawItemState.Focus;
1597                                                         }
1598                                                 }
1599
1600                                                 owner.OnDrawItem (new DrawItemEventArgs (dc, owner.Font, item_rect,
1601                                                         i, state, owner.ForeColor, owner.BackColor));
1602                                         }
1603                                 }
1604                         }
1605
1606                         private int highlighted_index = -1;
1607                         public int HighlightedIndex {
1608                                 get { return highlighted_index; }
1609                                 set {
1610                                         if (highlighted_index != -1)
1611                                                 Invalidate (GetItemDisplayRectangle (highlighted_index, top_item));
1612                                         highlighted_index = value;
1613                                         if (value != -1)
1614                                                 Invalidate (GetItemDisplayRectangle (highlighted_index, top_item));
1615
1616                                         // Scroll if we need to
1617                                         if (vscrollbar_ctrl != null) {
1618                                                 int max = (owner.Items.Count <= owner.MaxDropDownItems) ?
1619                                                        owner.Items.Count : owner.MaxDropDownItems;
1620
1621                                                 if (value > max + vscrollbar_ctrl.Value - 1) {
1622                                                         vscrollbar_ctrl.Value += (value - (max + vscrollbar_ctrl.Value - 1));
1623                                                 } else if (value < vscrollbar_ctrl.Value) {
1624                                                         vscrollbar_ctrl.Value = value;
1625                                                 }
1626                                         }
1627                                 }
1628                         }
1629
1630                         private Rectangle GetItemDisplayRectangle (int index, int top_index)
1631                         {
1632                                 if (index < 0 || index >= owner.Items.Count)
1633                                         throw new  ArgumentOutOfRangeException ("GetItemRectangle index out of range.");
1634
1635                                 Rectangle item_rect = new Rectangle ();
1636                                 int height = owner.GetItemHeight (index);
1637
1638                                 item_rect.X = 0;
1639                                 item_rect.Width = textarea_drawable.Width;
1640                                 if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1641                                         item_rect.Y = 0;
1642                                         for (int i = top_index; i < index; i++)
1643                                                 item_rect.Y += owner.GetItemHeight (i);
1644                                 } else
1645                                         item_rect.Y = height * (index - top_index);
1646
1647                                 item_rect.Height = height;
1648                                 return item_rect;
1649                         }
1650
1651                         public void HideWindow ()
1652                         {
1653                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1654                                         return;
1655
1656                                 Capture = false;
1657                                 Hide ();
1658                                 owner.DropDownListBoxFinished ();
1659                         }
1660
1661                         private int IndexFromPointDisplayRectangle (int x, int y)
1662                         {
1663                                 for (int i = top_item; i <= last_item; i++) {
1664                                         if (GetItemDisplayRectangle (i, top_item).Contains (x, y) == true)
1665                                                 return i;
1666                                 }
1667
1668                                 return -1;
1669                         }
1670
1671                         protected override bool IsInputKey (Keys keyData)
1672                         {
1673                                 return owner.IsInputKey (keyData);
1674                         }
1675
1676                         private int LastVisibleItem ()
1677                         {
1678                                 Rectangle item_rect;
1679                                 int top_y = textarea_drawable.Y + textarea_drawable.Height;
1680                                 int i = 0;
1681
1682                                 for (i = top_item; i < owner.Items.Count; i++) {
1683                                         item_rect = GetItemDisplayRectangle (i, top_item);
1684                                         if (item_rect.Y + item_rect.Height > top_y) {
1685                                                 return i;
1686                                         }
1687                                 }
1688                                 return i - 1;
1689                         }
1690
1691                         private void NavigateItemVisually (ItemNavigation navigation)
1692                         {
1693                                 int item = -1;
1694
1695                                 switch (navigation) {
1696                                 case ItemNavigation.Next:
1697                                         if (HighlightedIndex + 1 < owner.Items.Count) {
1698                                                 if (HighlightedIndex + 1 > last_item) {
1699                                                         top_item++;
1700                                                         vscrollbar_ctrl.Value = top_item;
1701                                                 }
1702                                                 item = HighlightedIndex + 1;
1703                                         }
1704                                         break;
1705
1706                                 case ItemNavigation.Previous:
1707                                         if (HighlightedIndex > 0) {
1708                                                 if (HighlightedIndex - 1 < top_item) {
1709                                                         top_item--;
1710                                                         vscrollbar_ctrl.Value = top_item;
1711                                                 }
1712                                                 item = HighlightedIndex - 1;
1713                                         }
1714                                         break;
1715
1716                                 case ItemNavigation.NextPage:
1717                                         if (HighlightedIndex + page_size - 1 >= owner.Items.Count) {
1718                                                 top_item = owner.Items.Count - page_size;
1719                                                 vscrollbar_ctrl.Value = top_item;
1720                                                 item = owner.Items.Count - 1;
1721                                         } else {
1722                                                 if (HighlightedIndex + page_size - 1  > last_item) {
1723                                                         top_item = HighlightedIndex;
1724                                                         vscrollbar_ctrl.Value = HighlightedIndex;
1725                                                 }
1726                                                 item = HighlightedIndex + page_size - 1;
1727                                         }
1728                                         break;
1729
1730                                 case ItemNavigation.PreviousPage:
1731                                         if (HighlightedIndex - page_size - 1 <= 0) {
1732                                                 top_item = 0;
1733                                                 vscrollbar_ctrl.Value = top_item;
1734                                                 item = 0;
1735                                         } else {
1736                                                 if (HighlightedIndex - page_size - 1  < top_item) {
1737                                                         top_item = HighlightedIndex - page_size - 1;
1738                                                         vscrollbar_ctrl.Value = top_item;
1739                                                 }
1740                                                 item = HighlightedIndex - page_size - 1;
1741                                         }
1742                                         break;
1743
1744                                 default:
1745                                         break;
1746                                 }
1747
1748                                 if (item != -1) {
1749                                         HighlightedIndex = item;
1750                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1751                                         if (owner.DropDownStyle == ComboBoxStyle.Simple)
1752                                                 owner.SetControlText (owner.GetItemText (owner.Items[item]));
1753                                 }
1754                         }
1755
1756                         private void OnKeyDownPUW (object sender, KeyEventArgs e)
1757                         {
1758                                 switch (e.KeyCode) {
1759                                 case Keys.Up:
1760                                         NavigateItemVisually (ItemNavigation.Previous);
1761                                         break;
1762
1763                                 case Keys.Down:
1764                                         NavigateItemVisually (ItemNavigation.Next);
1765                                         break;
1766
1767                                 case Keys.PageUp:
1768                                         NavigateItemVisually (ItemNavigation.PreviousPage);
1769                                         break;
1770
1771                                 case Keys.PageDown:
1772                                         NavigateItemVisually (ItemNavigation.NextPage);
1773                                         break;
1774                                 }
1775                         }
1776
1777                         protected override void OnKeyPress (KeyPressEventArgs e)
1778                         {
1779                                 int index = owner.FindStringCaseInsensitive (e.KeyChar.ToString (),
1780                                                 owner.SelectedIndex + 1);
1781                                 if (index == -1)
1782                                         return;
1783                                 owner.SelectedIndex = index;
1784                         }
1785
1786                         public void SetTopItem (int item)
1787                         {
1788                                 if (top_item == item)
1789                                         return;
1790                                 top_item = item;
1791                                 UpdateLastVisibleItem ();
1792                                 Refresh ();
1793                         }
1794
1795                         private void OnMouseDownPUW (object sender, MouseEventArgs e)
1796                         {
1797                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1798
1799                                 if (index == -1) {
1800                                         if (vscrollbar_ctrl == null || !vscrollbar_ctrl.FireMouseDown (e))
1801                                                 HideWindow ();
1802                                 } else {
1803                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1804                                         owner.SelectedIndex = index;
1805                                         HighlightedIndex = index;
1806                                         HideWindow ();
1807                                 }
1808
1809                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1810                                         owner.OnMouseDown (e);
1811                                         owner.textbox_ctrl.Focus ();
1812                                 }
1813                         }
1814
1815                         private void OnMouseMovePUW (object sender, MouseEventArgs e)
1816                         {
1817                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1818                                         owner.OnMouseMove (e);
1819                                         return;
1820                                 }
1821
1822                                 Point pt = PointToClient (Control.MousePosition);
1823                                 int index = IndexFromPointDisplayRectangle (pt.X, pt.Y);
1824
1825                                 if (index != -1) {
1826                                         HighlightedIndex = index;
1827                                         return;
1828                                 }
1829
1830                                 if (vscrollbar_ctrl != null)
1831                                         vscrollbar_ctrl.FireMouseMove (e);
1832                         }
1833
1834                         private void OnMouseUpPUW (object sender, MouseEventArgs e)
1835                         {
1836                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1837                                         owner.OnMouseUp (e);
1838                                         return;
1839                                 }
1840
1841                                 if (vscrollbar_ctrl != null)
1842                                         vscrollbar_ctrl.FireMouseUp (e);
1843                         }
1844
1845                         internal override void OnPaintInternal (PaintEventArgs pevent)
1846                         {
1847                                 Draw (pevent.ClipRectangle,pevent.Graphics);
1848                         }
1849
1850                         public bool ShowWindow ()
1851                         {
1852                                 if (owner.DropDownStyle == ComboBoxStyle.Simple && owner.Items.Count == 0)
1853                                         return false;
1854
1855                                 HighlightedIndex = owner.SelectedIndex;
1856
1857                                 CalcListBoxArea ();
1858                                 Show ();
1859
1860                                 Refresh ();
1861                                 owner.OnDropDown (EventArgs.Empty);
1862                                 return true;
1863                         }
1864
1865                         public void UpdateLastVisibleItem ()
1866                         {
1867                                 last_item = LastVisibleItem ();
1868                         }
1869
1870                         private void Scroll (int delta)
1871                         {
1872                                 if (delta == 0 || !vscrollbar_ctrl.Visible)
1873                                         return;
1874
1875                                 int max = vscrollbar_ctrl.Maximum;//- (page_size) + 1;
1876
1877                                 int val = vscrollbar_ctrl.Value + delta;
1878                                 if (val > max)
1879                                         val = max;
1880                                 else if (val < vscrollbar_ctrl.Minimum)
1881                                         val = vscrollbar_ctrl.Minimum;
1882                                 vscrollbar_ctrl.Value = val;
1883                         }
1884
1885                         private void OnMouseWheelCLB (object sender, MouseEventArgs me)
1886                         {
1887                                 if (owner.Items.Count == 0)
1888                                         return;
1889
1890                                 int lines = me.Delta / 120 * SystemInformation.MouseWheelScrollLines;
1891                                 Scroll (-lines);
1892                         }
1893
1894                         // Value Changed
1895                         private void VerticalScrollEvent (object sender, EventArgs e)
1896                         {
1897                                 if (top_item == vscrollbar_ctrl.Value)
1898                                         return;
1899
1900                                 top_item =  vscrollbar_ctrl.Value;
1901                                 UpdateLastVisibleItem ();
1902                                 Refresh ();
1903                         }
1904
1905                         #endregion Private Methods
1906                 }
1907         }
1908 }
1909