mcs/class/Managed.Windows.Forms/System.Windows.Forms/ComboBox.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2004-2006 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jordi Mas i Hernandez, jordi@ximian.com
  24 //      Mike Kestner  <mkestner@novell.com>
  25 //
  26 // NOT COMPLETE
  27
  28 using System;
  29 using System.Drawing;
  30 using System.Collections;
  31 using System.ComponentModel;
  32 using System.Reflection;
  33 using System.ComponentModel.Design;
  34 using System.ComponentModel.Design.Serialization;
  35 using System.Runtime.InteropServices;
  36
  37
  38 namespace System.Windows.Forms
  39 {
  40
  41         [DefaultProperty("Items")]
  42         [DefaultEvent("SelectedIndexChanged")]
  43         [Designer ("System.Windows.Forms.Design.ComboBoxDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  44         public class ComboBox : ListControl
  45         {
  46                 private DrawMode draw_mode = DrawMode.Normal;
  47                 private ComboBoxStyle dropdown_style = (ComboBoxStyle)(-1);
  48                 private int dropdown_width = -1;
  49                 private int selected_index = -1;
  50                 internal ObjectCollection items = null;
  51                 private bool suspend_ctrlupdate;
  52                 private int maxdrop_items = 8;
  53                 private bool integral_height = true;
  54                 private bool sorted;
  55                 private int max_length;
  56                 private ComboListBox listbox_ctrl;
  57                 private ComboTextBox textbox_ctrl;
  58                 private bool process_textchanged_event = true;
  59                 private bool item_height_specified = false;
  60                 private int item_height;
  61                 private int requested_height = -1;
  62                 private Hashtable item_heights;
  63                 private bool show_dropdown_button = false;
  64                 private ButtonState button_state = ButtonState.Normal;
  65                 private bool dropped_down;
  66                 private Rectangle text_area;
  67                 private Rectangle button_area;
  68                 private Rectangle listbox_area;
  69                 private const int button_width = 16;
  70
  71                 [ComVisible(true)]
  72                 public class ChildAccessibleObject : AccessibleObject {
  73                         private ComboBox        owner;
  74                         private IntPtr          handle;
  75
  76                         public ChildAccessibleObject (ComboBox owner, IntPtr handle) {
  77                                 this.owner = owner;
  78                                 this.handle = handle;
  79                         }
  80
  81                         public override string Name {
  82                                 get {
  83                                         return base.Name;
  84                                 }
  85                         }
  86                 }
  87
  88                 public ComboBox ()
  89                 {
  90                         items = new ObjectCollection (this);
  91                         DropDownStyle = ComboBoxStyle.DropDown;
  92                         item_height = FontHeight + 2;
  93                         BackColor = ThemeEngine.Current.ColorWindow;
  94                         border_style = BorderStyle.None;
  95
  96                         /* Events */
  97                         MouseDown += new MouseEventHandler (OnMouseDownCB);
  98                         MouseUp += new MouseEventHandler (OnMouseUpCB);
  99                         MouseMove += new MouseEventHandler (OnMouseMoveCB);
 100                         MouseWheel += new MouseEventHandler (OnMouseWheelCB);
 101                         KeyDown +=new KeyEventHandler(OnKeyDownCB);
 102                 }
 103
 104                 #region events
 105
 106                 [Browsable (false)]
 107                 [EditorBrowsable (EditorBrowsableState.Never)]
 108                 public new event EventHandler BackgroundImageChanged {
 109                         add { base.BackgroundImageChanged += value; }
 110                         remove { base.BackgroundImageChanged -= value; }
 111                 }
 112
 113                 public event DrawItemEventHandler DrawItem;
 114                 public event EventHandler DropDown;
 115                 public event EventHandler DropDownStyleChanged;
 116                 public event MeasureItemEventHandler MeasureItem;
 117
 118                 [Browsable (false)]
 119                 [EditorBrowsable (EditorBrowsableState.Never)]
 120                 public new event PaintEventHandler Paint {
 121                         add { base.Paint += value; }
 122                         remove { base.Paint -= value; }
 123                 }
 124
 125                 public event EventHandler SelectedIndexChanged;
 126                 public event EventHandler SelectionChangeCommitted;
 127                 #endregion Events
 128
 129                 #region Public Properties
 130                 public override Color BackColor {
 131                         get { return base.BackColor; }
 132                         set {
 133                                 if (base.BackColor == value)
 134                                         return;
 135
 136                                 base.BackColor = value;
 137                                 Refresh ();
 138                         }
 139                 }
 140
 141                 [Browsable (false)]
 142                 [EditorBrowsable (EditorBrowsableState.Never)]
 143                 public override Image BackgroundImage {
 144                         get { return base.BackgroundImage; }
 145                         set {
 146                                 if (base.BackgroundImage == value)
 147                                         return;
 148
 149                                 base.BackgroundImage = value;
 150                                 Refresh ();
 151                         }
 152                 }
 153
 154                 protected override CreateParams CreateParams {
 155                         get { return base.CreateParams;}
 156                 }
 157
 158                 protected override Size DefaultSize {
 159                         get { return new Size (121, 21); }
 160                 }
 161
 162                 [RefreshProperties(RefreshProperties.Repaint)]
 163                 [DefaultValue (DrawMode.Normal)]
 164                 public DrawMode DrawMode {
 165                         get { return draw_mode; }
 166
 167                         set {
 168                                 if (!Enum.IsDefined (typeof (DrawMode), value))
 169                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for DrawMode", value));
 170
 171                                 if (draw_mode == value)
 172                                         return;
 173
 174                                 if (draw_mode == DrawMode.OwnerDrawVariable)
 175                                         item_heights = null;
 176                                 draw_mode = value;
 177                                 if (draw_mode == DrawMode.OwnerDrawVariable)
 178                                         item_heights = new Hashtable ();
 179                                 Refresh ();
 180                         }
 181                 }
 182
 183                 [DefaultValue (ComboBoxStyle.DropDown)]
 184                 [RefreshProperties(RefreshProperties.Repaint)]
 185                 public ComboBoxStyle DropDownStyle {
 186                         get { return dropdown_style; }
 187
 188                         set {
 189
 190                                 if (!Enum.IsDefined (typeof (ComboBoxStyle), value))
 191                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for ComboBoxStyle", value));
 192
 193                                 if (dropdown_style == value)
 194                                         return;
 195
 196                                 if (dropdown_style == ComboBoxStyle.Simple) {
 197                                         if (listbox_ctrl != null) {
 198                                                 Controls.RemoveImplicit (listbox_ctrl);
 199                                                 listbox_ctrl.Dispose ();
 200                                                 listbox_ctrl = null;
 201                                         }
 202                                 }
 203
 204                                 dropdown_style = value;
 205
 206                                 if (dropdown_style == ComboBoxStyle.DropDownList && textbox_ctrl != null) {
 207                                         Controls.RemoveImplicit (textbox_ctrl);
 208                                         textbox_ctrl.Dispose ();
 209                                         textbox_ctrl = null;
 210                                 }
 211
 212                                 if (dropdown_style == ComboBoxStyle.Simple) {
 213                                         show_dropdown_button = false;
 214
 215                                         CreateComboListBox ();
 216
 217                                         if (IsHandleCreated)
 218                                                 Controls.AddImplicit (listbox_ctrl);
 219                                 } else {
 220                                         show_dropdown_button = true;
 221                                         button_state = ButtonState.Normal;
 222                                 }
 223
 224                                 if (dropdown_style != ComboBoxStyle.DropDownList && textbox_ctrl == null) {
 225                                         textbox_ctrl = new ComboTextBox (this);
 226                                         object selected_item = SelectedItem;
 227                                         if (selected_item != null)
 228                                                 textbox_ctrl.Text = GetItemText (selected_item);
 229                                         textbox_ctrl.BorderStyle = BorderStyle.None;
 230                                         textbox_ctrl.TextChanged += new EventHandler (OnTextChangedEdit);
 231                                         textbox_ctrl.Click += new EventHandler (OnTextBoxClick);
 232
 233                                         if (IsHandleCreated == true) {
 234                                                 Controls.AddImplicit (textbox_ctrl);
 235                                         }
 236                                 }
 237
 238                                 OnDropDownStyleChanged (EventArgs.Empty);
 239
 240                                 Layout ();
 241                                 UpdateBounds ();
 242                                 Refresh ();
 243                         }
 244                 }
 245
 246                 public int DropDownWidth {
 247                         get {
 248                                 if (dropdown_width == -1)
 249                                         return Width;
 250
 251                                 return dropdown_width;
 252                         }
 253                         set {
 254                                 if (dropdown_width == value)
 255                                         return;
 256
 257                                 if (value < 1)
 258                                         throw new ArgumentException ("The DropDownWidth value is less than one");
 259
 260                                 dropdown_width = value;
 261                         }
 262                 }
 263
 264                 [Browsable (false)]
 265                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 266                 public bool DroppedDown {
 267                         get {
 268                                 if (dropdown_style == ComboBoxStyle.Simple)
 269                                         return true;
 270
 271                                 return dropped_down;
 272                         }
 273                         set {
 274                                 if (dropdown_style == ComboBoxStyle.Simple || dropped_down == value)
 275                                         return;
 276
 277                                 if (value)
 278                                         DropDownListBox ();
 279                                 else
 280                                         listbox_ctrl.Hide ();
 281                         }
 282                 }
 283
 284                 public override bool Focused {
 285                         get { return base.Focused; }
 286                 }
 287
 288                 public override Color ForeColor {
 289                         get { return base.ForeColor; }
 290                         set {
 291                                 if (base.ForeColor == value)
 292                                         return;
 293
 294                                 base.ForeColor = value;
 295                                 Refresh ();
 296                         }
 297                 }
 298
 299                 [DefaultValue (true)]
 300                 [Localizable (true)]
 301                 public bool IntegralHeight {
 302                         get { return integral_height; }
 303                         set {
 304                                 if (integral_height == value)
 305                                         return;
 306
 307                                 integral_height = value;
 308                                 UpdateBounds ();
 309                                 Refresh ();
 310                         }
 311                 }
 312
 313                 [Localizable (true)]
 314                 public int ItemHeight {
 315                         get {
 316                                 if (item_height == -1) {
 317                                         SizeF sz = DeviceContext.MeasureString ("The quick brown Fox", Font);
 318                                         item_height = (int) sz.Height;
 319                                 }
 320                                 return item_height;
 321                         }
 322                         set {
 323                                 if (value < 0)
 324                                         throw new ArgumentException ("The item height value is less than zero");
 325
 326                                 item_height_specified = true;
 327                                 item_height = value;
 328                                 if (IntegralHeight)
 329                                         UpdateBounds ();
 330                                 Layout ();
 331                                 Refresh ();
 332                         }
 333                 }
 334
 335                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 336                 [Localizable (true)]
 337                 [Editor ("System.Windows.Forms.Design.ListControlStringCollectionEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 338                 public ComboBox.ObjectCollection Items {
 339                         get { return items; }
 340                 }
 341
 342                 [DefaultValue (8)]
 343                 [Localizable (true)]
 344                 public int MaxDropDownItems {
 345                         get { return maxdrop_items; }
 346                         set {
 347                                 if (maxdrop_items == value)
 348                                         return;
 349
 350                                 maxdrop_items = value;
 351                         }
 352                 }
 353
 354                 [DefaultValue (0)]
 355                 [Localizable (true)]
 356                 public int MaxLength {
 357                         get { return max_length; }
 358                         set {
 359                                 if (max_length == value)
 360                                         return;
 361
 362                                 max_length = value;
 363
 364                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 365
 366                                         if (value < 0) {
 367                                                 value = 0;
 368                                         }
 369
 370                                         textbox_ctrl.MaxLength = value;
 371                                 }
 372                         }
 373                 }
 374
 375                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 376                 [Browsable (false)]
 377                 public int PreferredHeight {
 378                         get {
 379                                 return ItemHeight + 5;
 380                         }
 381                 }
 382
 383                 [Browsable (false)]
 384                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 385                 public override int SelectedIndex {
 386                         get { return selected_index; }
 387                         set {
 388                                 if (selected_index == value)
 389                                         return;
 390
 391                                 if (value <= -2 || value >= Items.Count)
 392                                         throw new ArgumentOutOfRangeException ("Index of out range");
 393                                 selected_index = value;
 394
 395                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 396                                         if (value == -1)
 397                                                 SetControlText("");
 398                                         else
 399                                                 SetControlText (GetItemText (Items [value]));
 400                                 }
 401
 402                                 if (DropDownStyle == ComboBoxStyle.DropDownList)
 403                                         Invalidate ();
 404
 405                                 if (listbox_ctrl != null)
 406                                         listbox_ctrl.HighlightedIndex = value;
 407
 408                                 OnSelectedValueChanged (new EventArgs ());
 409                                 OnSelectedIndexChanged (new EventArgs ());
 410                                 OnSelectedItemChanged (new EventArgs ());
 411                         }
 412                 }
 413
 414                 [Browsable (false)]
 415                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 416                 [Bindable(true)]
 417                 public object SelectedItem {
 418                         get { return selected_index == -1 ? null : Items [selected_index]; }
 419                         set {
 420                                 object item = selected_index == -1 ? null : Items [selected_index];
 421                                 if (item == value)
 422                                         return;
 423
 424                                 SelectedIndex = Items.IndexOf (value);
 425                         }
 426                 }
 427
 428                 [Browsable (false)]
 429                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 430                 public string SelectedText {
 431                         get {
 432                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 433                                         return "";
 434
 435                                 return textbox_ctrl.SelectedText;
 436                         }
 437                         set {
 438                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 439                                         return;
 440
 441                                 textbox_ctrl.SelectedText = value;
 442                         }
 443                 }
 444
 445                 [Browsable (false)]
 446                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 447                 public int SelectionLength {
 448                         get {
 449                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 450                                         return 0;
 451
 452                                 return textbox_ctrl.SelectionLength;
 453                         }
 454                         set {
 455                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 456                                         return;
 457
 458                                 if (textbox_ctrl.SelectionLength == value)
 459                                         return;
 460
 461                                 textbox_ctrl.SelectionLength = value;
 462                         }
 463                 }
 464
 465                 [Browsable (false)]
 466                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 467                 public int SelectionStart {
 468                         get {
 469                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 470                                         return 0;
 471
 472                                 return textbox_ctrl.SelectionStart;
 473                         }
 474                         set {
 475                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 476                                         return;
 477
 478                                 if (textbox_ctrl.SelectionStart == value)
 479                                         return;
 480
 481                                 textbox_ctrl.SelectionStart = value;
 482                         }
 483                 }
 484
 485                 [DefaultValue (false)]
 486                 public bool Sorted {
 487                         get { return sorted; }
 488
 489                         set {
 490                                 if (sorted == value)
 491                                         return;
 492
 493                                 sorted = value;
 494                                 SelectedIndex = -1;
 495                                 if (sorted) {
 496                                         Items.Sort ();
 497                                         Layout ();
 498                                 }
 499                         }
 500                 }
 501
 502                 [Bindable (true)]
 503                 [Localizable (true)]
 504                 public override string Text {
 505                         get {
 506                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 507                                         if (textbox_ctrl != null) {
 508                                                 return textbox_ctrl.Text;
 509                                         }
 510                                 }
 511
 512                                 if (SelectedItem != null)
 513                                         return GetItemText (SelectedItem);
 514
 515                                 return base.Text;
 516                         }
 517                         set {
 518                                 if (value == null) {
 519                                         SelectedIndex = -1;
 520                                         return;
 521                                 }
 522
 523                                 int index = FindString (value);
 524
 525                                 if (index != -1) {
 526                                         SelectedIndex = index;
 527                                         return;
 528                                 }
 529
 530                                 if (dropdown_style != ComboBoxStyle.DropDownList)
 531                                         textbox_ctrl.Text = GetItemText (value);
 532                         }
 533                 }
 534
 535                 #endregion Public Properties
 536
 537                 #region Public Methods
 538                 protected virtual void AddItemsCore (object[] value)
 539                 {
 540
 541                 }
 542
 543                 public void BeginUpdate ()
 544                 {
 545                         suspend_ctrlupdate = true;
 546                 }
 547
 548                 protected override void Dispose (bool disposing)
 549                 {
 550                         if (disposing) {
 551                                 if (listbox_ctrl != null) {
 552                                         listbox_ctrl.Dispose ();
 553                                         Controls.RemoveImplicit (listbox_ctrl);
 554                                         listbox_ctrl = null;
 555                                 }
 556
 557                                 if (textbox_ctrl != null) {
 558                                         Controls.RemoveImplicit (textbox_ctrl);
 559                                         textbox_ctrl.Dispose ();
 560                                         textbox_ctrl = null;
 561                                 }
 562                         }
 563
 564                         base.Dispose (disposing);
 565                 }
 566
 567                 public void EndUpdate ()
 568                 {
 569                         suspend_ctrlupdate = false;
 570                         UpdatedItems ();
 571                         Refresh ();
 572                 }
 573
 574                 public int FindString (string s)
 575                 {
 576                         return FindString (s, -1);
 577                 }
 578
 579                 public int FindString (string s, int startIndex)
 580                 {
 581                         if (Items.Count == 0)
 582                                 return -1; // No exception throwing if empty
 583
 584                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 585                                 throw new  ArgumentOutOfRangeException ("Index of out range");
 586
 587                         startIndex++;
 588                         for (int i = startIndex; i < Items.Count; i++) {
 589                                 if ((GetItemText (Items[i])).StartsWith (s))
 590                                         return i;
 591                         }
 592
 593                         return -1;
 594                 }
 595
 596                 public int FindStringExact (string s)
 597                 {
 598                         return FindStringExact (s, -1);
 599                 }
 600
 601                 public int FindStringExact (string s, int startIndex)
 602                 {
 603                         if (Items.Count == 0)
 604                                 return -1; // No exception throwing if empty
 605
 606                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 607                                 throw new ArgumentOutOfRangeException ("Index of out range");
 608
 609                         startIndex++;
 610                         for (int i = startIndex; i < Items.Count; i++) {
 611                                 if ((GetItemText (Items[i])).Equals (s))
 612                                         return i;
 613                         }
 614
 615                         return -1;
 616                 }
 617
 618                 public int GetItemHeight (int index)
 619                 {
 620                         if (DrawMode == DrawMode.OwnerDrawVariable && IsHandleCreated) {
 621
 622                                 if (index < 0 || index >= Items.Count )
 623                                         throw new ArgumentOutOfRangeException ("The item height value is less than zero");
 624
 625                                 object item = Items [index];
 626                                 if (item_heights.Contains (item))
 627                                         return (int) item_heights [item];
 628
 629                                 MeasureItemEventArgs args = new MeasureItemEventArgs (DeviceContext, index, ItemHeight);
 630                                 OnMeasureItem (args);
 631                                 item_heights [item] = args.ItemHeight;
 632                                 return args.ItemHeight;
 633                         }
 634
 635                         return ItemHeight;
 636                 }
 637
 638                 protected override bool IsInputKey (Keys keyData)
 639                 {
 640                         switch (keyData) {
 641                         case Keys.Up:
 642                         case Keys.Down:
 643                         case Keys.Left:
 644                         case Keys.Right:
 645                         case Keys.PageUp:
 646                         case Keys.PageDown:
 647                                 return true;
 648
 649                         default:
 650                                 return false;
 651                         }
 652                 }
 653
 654                 protected override void OnBackColorChanged (EventArgs e)
 655                 {
 656                         base.OnBackColorChanged (e);
 657                 }
 658
 659                 protected override void OnDataSourceChanged (EventArgs e)
 660                 {
 661                         base.OnDataSourceChanged (e);
 662                         BindDataItems ();
 663
 664                         if (DataSource == null || DataManager == null) {
 665                                 SelectedIndex = -1;
 666                         }
 667                         else {
 668                                 SelectedIndex = DataManager.Position;
 669                         }
 670                 }
 671
 672                 protected override void OnDisplayMemberChanged (EventArgs e)
 673                 {
 674                         base.OnDisplayMemberChanged (e);
 675
 676                         if (DataManager == null || !IsHandleCreated)
 677                                return;
 678
 679                         BindDataItems ();
 680                         SelectedIndex = DataManager.Position;
 681                 }
 682
 683                 protected virtual void OnDrawItem (DrawItemEventArgs e)
 684                 {
 685                         switch (DrawMode) {
 686                         case DrawMode.OwnerDrawFixed:
 687                         case DrawMode.OwnerDrawVariable:
 688                                 if (DrawItem != null)
 689                                         DrawItem (this, e);
 690                                 break;
 691                         default:
 692                                 ThemeEngine.Current.DrawComboBoxItem (this, e);
 693                                 break;
 694                         }
 695                 }
 696
 697                 protected virtual void OnDropDown (EventArgs e)
 698                 {
 699                         if (DropDown != null)
 700                                 DropDown (this, e);
 701                 }
 702
 703                 protected virtual void OnDropDownStyleChanged (EventArgs e)
 704                 {
 705                         if (DropDownStyleChanged != null)
 706                                 DropDownStyleChanged (this, e);
 707                 }
 708
 709                 protected override void OnFontChanged (EventArgs e)
 710                 {
 711                         base.OnFontChanged (e);
 712
 713                         if (textbox_ctrl != null)
 714                                 textbox_ctrl.Font = Font;
 715
 716                         if (!item_height_specified) {
 717                                 SizeF sz = DeviceContext.MeasureString ("The quick brown Fox", Font);
 718                                 item_height = (int) sz.Height;
 719                         }
 720
 721                         if (IntegralHeight)
 722                                 UpdateBounds ();
 723
 724                         Layout ();
 725                 }
 726
 727                 protected override void OnForeColorChanged (EventArgs e)
 728                 {
 729                         base.OnForeColorChanged (e);
 730                 }
 731
 732                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 733                 protected override void OnGotFocus (EventArgs e)
 734                 {
 735                         if (dropdown_style == ComboBoxStyle.DropDownList) {
 736                                 // We draw DDL styles manually, so they require a
 737                                 // refresh to have their selection drawn
 738                                 Invalidate ();
 739                         }
 740
 741                         if (textbox_ctrl != null) {
 742                                 textbox_ctrl.SetSelectable (false);
 743                                 textbox_ctrl.ActivateCaret (true);
 744                                 textbox_ctrl.ShowSelection = true;
 745                                 textbox_ctrl.SelectAll ();
 746                         }
 747
 748                         base.OnGotFocus (e);
 749                 }
 750
 751                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 752                 protected override void OnLostFocus (EventArgs e)
 753                 {
 754                         if (dropdown_style == ComboBoxStyle.DropDownList) {
 755                                 // We draw DDL styles manually, so they require a
 756                                 // refresh to have their selection drawn
 757                                 Invalidate ();
 758                         }
 759
 760                         if (listbox_ctrl != null && dropped_down) {
 761                                 listbox_ctrl.HideWindow ();
 762                         }
 763
 764                         if (textbox_ctrl != null) {
 765                                 textbox_ctrl.SetSelectable (true);
 766                                 textbox_ctrl.ActivateCaret (false);
 767                                 textbox_ctrl.ShowSelection = false;
 768                         }
 769
 770                         base.OnLostFocus (e);
 771                 }
 772
 773                 protected override void OnHandleCreated (EventArgs e)
 774                 {
 775                         base.OnHandleCreated (e);
 776
 777                         if (listbox_ctrl != null)
 778                                 Controls.AddImplicit (listbox_ctrl);
 779
 780                         if (textbox_ctrl != null)
 781                                 Controls.AddImplicit (textbox_ctrl);
 782
 783                         Layout ();
 784                 }
 785
 786                 protected override void OnHandleDestroyed (EventArgs e)
 787                 {
 788                         base.OnHandleDestroyed (e);
 789                 }
 790
 791                 protected override void OnKeyPress (KeyPressEventArgs e)
 792                 {
 793                         // int index = FindStringCaseInsensitive (e.KeyChar.ToString (), SelectedIndex);
 794                         //if (index != -1)
 795                         //      SelectedIndex = index;
 796
 797                         base.OnKeyPress (e);
 798                 }
 799
 800                 protected virtual void OnMeasureItem (MeasureItemEventArgs e)
 801                 {
 802                         if (MeasureItem != null)
 803                                 MeasureItem (this, e);
 804                 }
 805
 806                 protected override void OnParentBackColorChanged (EventArgs e)
 807                 {
 808                         base.OnParentBackColorChanged (e);
 809                 }
 810
 811                 protected override void OnResize (EventArgs e)
 812                 {
 813                         Layout ();
 814                         if (listbox_ctrl != null)
 815                                 listbox_ctrl.CalcListBoxArea ();
 816                 }
 817
 818                 protected override void OnSelectedIndexChanged (EventArgs e)
 819                 {
 820                         base.OnSelectedIndexChanged (e);
 821
 822                         if (SelectedIndexChanged != null)
 823                                 SelectedIndexChanged (this, e);
 824                 }
 825
 826                 protected virtual void OnSelectedItemChanged (EventArgs e)
 827                 {
 828
 829                 }
 830
 831                 protected override void OnSelectedValueChanged (EventArgs e)
 832                 {
 833                         base.OnSelectedValueChanged (e);
 834                 }
 835
 836                 protected virtual void OnSelectionChangeCommitted (EventArgs e)
 837                 {
 838                         if (SelectionChangeCommitted != null)
 839                                 SelectionChangeCommitted (this, e);
 840                 }
 841
 842                 protected override void RefreshItem (int index)
 843                 {
 844                         if (index < 0 || index >= Items.Count)
 845                                 throw new ArgumentOutOfRangeException ("Index of out range");
 846
 847                         if (draw_mode == DrawMode.OwnerDrawVariable)
 848                                 item_heights.Remove (Items [index]);
 849                 }
 850
 851                 public void Select (int start, int length)
 852                 {
 853                         if (start < 0)
 854                                 throw new ArgumentException ("Start cannot be less than zero");
 855
 856                         if (length < 0)
 857                                 throw new ArgumentException ("length cannot be less than zero");
 858
 859                         if (dropdown_style == ComboBoxStyle.DropDownList)
 860                                 return;
 861
 862                         textbox_ctrl.Select (start, length);
 863                 }
 864
 865                 public void SelectAll ()
 866                 {
 867                         if (dropdown_style == ComboBoxStyle.DropDownList)
 868                                 return;
 869
 870                         if (textbox_ctrl != null) {
 871                                 textbox_ctrl.ShowSelection = true;
 872                                 textbox_ctrl.SelectAll ();
 873                         }
 874                 }
 875
 876                 protected override void SetBoundsCore (int x, int y, int width, int height, BoundsSpecified specified)
 877                 {
 878                         if ((specified & BoundsSpecified.Height) != 0) {
 879                                 requested_height = height;
 880
 881                                 if (DropDownStyle == ComboBoxStyle.Simple && height > PreferredHeight) {
 882                                         if (IntegralHeight) {
 883                                                 int border = ThemeEngine.Current.Border3DSize.Height;
 884                                                 int lb_height = height - PreferredHeight - 2;
 885                                                 if (lb_height - 2 * border > ItemHeight) {
 886                                                         int partial = (lb_height - 2 * border) % ItemHeight;
 887                                                         height -= partial;
 888                                                 } else
 889                                                         height = PreferredHeight;
 890                                         }
 891                                 } else
 892                                         height = PreferredHeight;
 893                         }
 894
 895                         base.SetBoundsCore (x, y, width, height, specified);
 896                 }
 897
 898                 protected override void SetItemCore (int index, object value)
 899                 {
 900                         if (index < 0 || index >= Items.Count)
 901                                 return;
 902
 903                         Items[index] = value;
 904                 }
 905
 906                 protected override void SetItemsCore (IList value)
 907                 {
 908                         BeginUpdate ();
 909                         try {
 910                                 Items.Clear ();
 911                                 Items.AddRange (value);
 912                         } finally {
 913                                EndUpdate ();
 914                         }
 915                 }
 916
 917                 public override string ToString ()
 918                 {
 919                         return base.ToString () + ", Items.Count:" + Items.Count;
 920                 }
 921
 922                 protected override void WndProc (ref Message m)
 923                 {
 924                         switch ((Msg) m.Msg) {
 925                         case Msg.WM_KEYUP:
 926                         case Msg.WM_KEYDOWN:
 927                                 Keys keys = (Keys) m.WParam.ToInt32 ();
 928                                 if (keys == Keys.Up || keys == Keys.Down)
 929                                         break;
 930                                 goto case Msg.WM_CHAR;
 931                         case Msg.WM_CHAR:
 932                                 if (textbox_ctrl != null)
 933                                         XplatUI.SendMessage (textbox_ctrl.Handle, (Msg) m.Msg, m.WParam, m.LParam);
 934                                 break;
 935                         case Msg.WM_MOUSE_LEAVE:
 936                                 Point location = PointToClient (Control.MousePosition);
 937                                 if (ClientRectangle.Contains (location))
 938                                         return;
 939                                 break;
 940                         default:
 941                                 break;
 942                         }
 943                         base.WndProc (ref m);
 944                 }
 945
 946                 #endregion Public Methods
 947
 948                 #region Private Methods
 949
 950                 internal override bool InternalCapture {
 951                         get { return Capture; }
 952                         set {}
 953                 }
 954
 955                 void Layout ()
 956                 {
 957                         int border = ThemeEngine.Current.Border3DSize.Width;
 958
 959                         text_area = ClientRectangle;
 960                         text_area.Height = PreferredHeight;
 961
 962                         listbox_area = ClientRectangle;
 963                         listbox_area.Y = text_area.Bottom + 3;
 964                         listbox_area.Height -= (text_area.Height + 2);
 965
 966                         Rectangle prev_button_area = button_area;
 967
 968                         if (DropDownStyle == ComboBoxStyle.Simple)
 969                                 button_area = Rectangle.Empty;
 970                         else {
 971                                 button_area = text_area;
 972                                 button_area.X = text_area.Right - button_width - border;
 973                                 button_area.Y = text_area.Y + border;
 974                                 button_area.Width = button_width;
 975                                 button_area.Height = text_area.Height - 2 * border;
 976                         }
 977
 978                         if (button_area != prev_button_area) {
 979                                 prev_button_area.Y -= border;
 980                                 prev_button_area.Width += border;
 981                                 prev_button_area.Height += 2 * border;
 982                                 Invalidate (prev_button_area);
 983                                 Invalidate (button_area);
 984                         }
 985
 986                         if (textbox_ctrl != null) {
 987                                 textbox_ctrl.Location = new Point (text_area.X + border, text_area.Y + border);
 988                                 textbox_ctrl.Width = text_area.Width - button_area.Width - border * 2;
 989                                 textbox_ctrl.Height = text_area.Height - border * 2;
 990                         }
 991
 992                         if (listbox_ctrl != null && dropdown_style == ComboBoxStyle.Simple) {
 993                                 listbox_ctrl.Location = listbox_area.Location;
 994                                 listbox_ctrl.CalcListBoxArea ();
 995                         }
 996                 }
 997
 998                 private void CreateComboListBox ()
 999                 {
1000                         listbox_ctrl = new ComboListBox (this);
1001                         listbox_ctrl.HighlightedIndex = SelectedIndex;
1002                 }
1003
1004                 internal void Draw (Rectangle clip, Graphics dc)
1005                 {
1006                         Theme theme = ThemeEngine.Current;
1007
1008                         if (DropDownStyle == ComboBoxStyle.Simple)
1009                                 dc.FillRectangle (theme.ResPool.GetSolidBrush (Parent.BackColor), ClientRectangle);
1010
1011                         if (clip.IntersectsWith (text_area))
1012                                 ControlPaint.DrawBorder3D (dc, text_area, Border3DStyle.Sunken);
1013
1014                         int border = theme.Border3DSize.Width;
1015
1016                         // No edit control, we paint the edit ourselves
1017                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1018                                 DrawItemState state = DrawItemState.None;
1019                                 Rectangle item_rect = text_area;
1020                                 item_rect.X += border;
1021                                 item_rect.Y += border;
1022                                 item_rect.Width -= (button_area.Width + 2 * border);
1023                                 item_rect.Height -= 2 * border;
1024
1025                                 if (Focused) {
1026                                         state = DrawItemState.Selected;
1027                                         state |= DrawItemState.Focus;
1028                                 }
1029
1030                                 state |= DrawItemState.ComboBoxEdit;
1031                                 OnDrawItem (new DrawItemEventArgs (dc, Font, item_rect, SelectedIndex, state, ForeColor, BackColor));
1032                         }
1033
1034                         if (show_dropdown_button) {
1035                                 dc.FillRectangle (theme.ResPool.GetSolidBrush (theme.ColorControl), button_area);
1036
1037                                 if (!is_enabled)
1038                                         button_state = ButtonState.Inactive;
1039
1040                                 theme.CPDrawComboButton (dc, button_area, button_state);
1041                         }
1042                 }
1043
1044                 internal void DropDownListBox ()
1045                 {
1046                         if (DropDownStyle == ComboBoxStyle.Simple)
1047                                 return;
1048
1049                         if (listbox_ctrl == null)
1050                                 CreateComboListBox ();
1051
1052                         listbox_ctrl.Location = PointToScreen (new Point (text_area.X, text_area.Y + text_area.Height));
1053
1054                         if (listbox_ctrl.ShowWindow ())
1055                                 dropped_down = true;
1056
1057                         button_state = ButtonState.Pushed;
1058                         if (dropdown_style == ComboBoxStyle.DropDownList)
1059                                 Invalidate (text_area);
1060                 }
1061
1062                 internal void DropDownListBoxFinished ()
1063                 {
1064                         if (DropDownStyle == ComboBoxStyle.Simple)
1065                                 return;
1066
1067                         button_state = ButtonState.Normal;
1068                         Invalidate (button_area);
1069                         dropped_down = false;
1070                 }
1071
1072                 private int FindStringCaseInsensitive (string search)
1073                 {
1074                         if (search.Length == 0) {
1075                                 return -1;
1076                         }
1077
1078                         for (int i = 0; i < Items.Count; i++)
1079                         {
1080                                 if (String.Compare (GetItemText (Items[i]), 0, search, 0, search.Length, true) == 0)
1081                                         return i;
1082                         }
1083
1084                         return -1;
1085                 }
1086
1087                 internal int FindStringCaseInsensitive (string search, int start_index)
1088                 {
1089                         if (search.Length == 0) {
1090                                 return -1;
1091                         }
1092
1093                         for (int i = 0; i < Items.Count; i++) {
1094                                 int index = (i + start_index) % Items.Count;
1095                                 if (String.Compare (GetItemText (Items [index]), 0, search, 0, search.Length, true) == 0)
1096                                         return index;
1097                         }
1098
1099                         return -1;
1100                 }
1101
1102                 private void OnKeyDownCB(object sender, KeyEventArgs e)
1103                 {
1104                         if (Items.Count == 0)
1105                                 return;
1106
1107                         switch (e.KeyCode)
1108                         {
1109                                 case Keys.Up:
1110                                         SelectedIndex = Math.Max(SelectedIndex-1, 0);
1111                                         break;
1112
1113                                 case Keys.Down:
1114                                         SelectedIndex = Math.Min(SelectedIndex+1, Items.Count-1);
1115                                         break;
1116
1117                                 case Keys.PageUp:
1118                                         if (listbox_ctrl != null)
1119                                                 SelectedIndex = Math.Max(SelectedIndex- (listbox_ctrl.page_size-1), 0);
1120                                         break;
1121
1122                                 case Keys.PageDown:
1123                                         if (listbox_ctrl != null)
1124                                                 SelectedIndex = Math.Min(SelectedIndex+(listbox_ctrl.page_size-1), Items.Count-1);
1125                                         break;
1126
1127                                 default:
1128                                         break;
1129                         }
1130                 }
1131
1132                 void OnMouseDownCB (object sender, MouseEventArgs e)
1133                 {
1134                         Rectangle area;
1135                         if (DropDownStyle == ComboBoxStyle.DropDownList)
1136                                 area = ClientRectangle;
1137                         else
1138                                 area = button_area;
1139
1140                         if (area.Contains (e.X, e.Y)) {
1141                                 DropDownListBox ();
1142                                 Invalidate (button_area);
1143                                 Update ();
1144                         }
1145                         Capture = true;
1146                 }
1147
1148                 void OnMouseMoveCB (object sender, MouseEventArgs e)
1149                 {
1150                         if (DropDownStyle == ComboBoxStyle.Simple)
1151                                 return;
1152
1153                         if (listbox_ctrl != null && listbox_ctrl.Visible) {
1154                                 Point location = listbox_ctrl.PointToClient (Control.MousePosition);
1155                                 if (listbox_ctrl.ClientRectangle.Contains (location))
1156                                         listbox_ctrl.Capture = true;
1157                         }
1158                 }
1159
1160                 void OnMouseUpCB (object sender, MouseEventArgs e)
1161                 {
1162                         Capture = false;
1163                         OnClick (EventArgs.Empty);
1164
1165                         if (dropped_down)
1166                                 listbox_ctrl.Capture = true;
1167                 }
1168
1169                 private void OnMouseWheelCB (object sender, MouseEventArgs me)
1170                 {
1171                         if (Items.Count == 0)
1172                                 return;
1173
1174                         if (listbox_ctrl != null && listbox_ctrl.Visible) {
1175                                 int lines = me.Delta / 120 * SystemInformation.MouseWheelScrollLines;
1176                                 listbox_ctrl.Scroll (-lines);
1177                         } else {
1178                                 int lines = me.Delta / 120;
1179                                 int index = SelectedIndex - lines;
1180                                 if (index < 0)
1181                                         index = 0;
1182                                 else if (index >= Items.Count)
1183                                         index = Items.Count - 1;
1184                                 SelectedIndex = index;
1185                         }
1186                 }
1187
1188                 internal override void OnPaintInternal (PaintEventArgs pevent)
1189                 {
1190                         if (suspend_ctrlupdate)
1191                                 return;
1192
1193                         Draw (ClientRectangle, pevent.Graphics);
1194                 }
1195
1196                 private void OnTextBoxClick (object sender, EventArgs e)
1197                 {
1198                         OnClick (e);
1199                 }
1200
1201                 private void OnTextChangedEdit (object sender, EventArgs e)
1202                 {
1203                         if (process_textchanged_event == false)
1204                                 return;
1205
1206                         OnTextChanged (EventArgs.Empty);
1207
1208                         int item = FindStringCaseInsensitive (textbox_ctrl.Text);
1209
1210                         if (item == -1)
1211                                 return;
1212
1213                         // TODO:  THIS IS BROKEN-ISH
1214                         // I don't think we should hilight, and setting the top item does weirdness
1215                         // when there is no scrollbar
1216
1217                         if (listbox_ctrl != null) {
1218                                 listbox_ctrl.SetTopItem (item);
1219                                 listbox_ctrl.HighlightedIndex = item;
1220                         }
1221
1222                         base.Text = textbox_ctrl.Text;
1223                 }
1224
1225                 internal void SetControlText (string s)
1226                 {
1227                         process_textchanged_event = false;
1228                         textbox_ctrl.Text = s;
1229                         process_textchanged_event = true;
1230                 }
1231
1232                 void UpdateBounds ()
1233                 {
1234                         if (requested_height != -1)
1235                                 SetBounds (0, 0, 0, requested_height, BoundsSpecified.Height);
1236                 }
1237
1238                 private void UpdatedItems ()
1239                 {
1240                         if (listbox_ctrl != null) {
1241                                 listbox_ctrl.UpdateLastVisibleItem ();
1242                                 listbox_ctrl.CalcListBoxArea ();
1243                                 listbox_ctrl.Refresh ();
1244                         }
1245                 }
1246
1247                 #endregion Private Methods
1248
1249                 [ListBindableAttribute (false)]
1250                 public class ObjectCollection : IList, ICollection, IEnumerable
1251                 {
1252
1253                         private ComboBox owner;
1254                         internal ArrayList object_items = new ArrayList ();
1255
1256                         public ObjectCollection (ComboBox owner)
1257                         {
1258                                 this.owner = owner;
1259                         }
1260
1261                         #region Public Properties
1262                         public int Count {
1263                                 get { return object_items.Count; }
1264                         }
1265
1266                         public bool IsReadOnly {
1267                                 get { return false; }
1268                         }
1269
1270                         [Browsable (false)]
1271                         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
1272                         public virtual object this [int index] {
1273                                 get {
1274                                         if (index < 0 || index >= Count)
1275                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1276
1277                                         return object_items[index];
1278                                 }
1279                                 set {
1280                                         if (index < 0 || index >= Count)
1281                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1282                                         if (value == null)
1283                                                 throw new ArgumentNullException ("value");
1284
1285                                         object_items[index] = value;
1286                                         if (owner.listbox_ctrl != null)
1287                                                 owner.listbox_ctrl.InvalidateItem (index);
1288                                         if (index == owner.SelectedIndex) {
1289                                                 if (owner.textbox_ctrl == null)
1290                                                         owner.Refresh ();
1291                                                 else
1292                                                         owner.textbox_ctrl.SelectedText = value.ToString ();
1293                                         }
1294                                 }
1295                         }
1296
1297                         bool ICollection.IsSynchronized {
1298                                 get { return false; }
1299                         }
1300
1301                         object ICollection.SyncRoot {
1302                                 get { return this; }
1303                         }
1304
1305                         bool IList.IsFixedSize {
1306                                 get { return false; }
1307                         }
1308
1309                         #endregion Public Properties
1310
1311                         #region Public Methods
1312                         public int Add (object item)
1313                         {
1314                                 int idx;
1315
1316                                 idx = AddItem (item);
1317                                 owner.UpdatedItems ();
1318                                 return idx;
1319                         }
1320
1321                         public void AddRange (object[] items)
1322                         {
1323                                 if (items == null)
1324                                         throw new ArgumentNullException ("items");
1325
1326                                 foreach (object mi in items)
1327                                         AddItem (mi);
1328
1329                                 owner.UpdatedItems ();
1330                         }
1331
1332                         public void Clear ()
1333                         {
1334                                 owner.selected_index = -1;
1335                                 object_items.Clear ();
1336                                 owner.UpdatedItems ();
1337                                 owner.Refresh ();
1338                         }
1339
1340                         public bool Contains (object obj)
1341                         {
1342                                 if (obj == null)
1343                                         throw new ArgumentNullException ("obj");
1344
1345                                 return object_items.Contains (obj);
1346                         }
1347
1348                         public void CopyTo (object[] dest, int arrayIndex)
1349                         {
1350                                 object_items.CopyTo (dest, arrayIndex);
1351                         }
1352
1353                         void ICollection.CopyTo (Array dest, int index)
1354                         {
1355                                 object_items.CopyTo (dest, index);
1356                         }
1357
1358                         public IEnumerator GetEnumerator ()
1359                         {
1360                                 return object_items.GetEnumerator ();
1361                         }
1362
1363                         int IList.Add (object item)
1364                         {
1365                                 return Add (item);
1366                         }
1367
1368                         public int IndexOf (object value)
1369                         {
1370                                 if (value == null)
1371                                         throw new ArgumentNullException ("value");
1372
1373                                 return object_items.IndexOf (value);
1374                         }
1375
1376                         public void Insert (int index,  object item)
1377                         {
1378                                 if (index < 0 || index > Count)
1379                                         throw new ArgumentOutOfRangeException ("Index of out range");
1380                                 if (item == null)
1381                                         throw new ArgumentNullException ("item");
1382
1383                                 owner.BeginUpdate ();
1384
1385                                 if (owner.Sorted)
1386                                         AddItem (item);
1387                                 else
1388                                         object_items.Insert (index, item);
1389
1390                                 owner.EndUpdate ();     // Calls UpdatedItems
1391                         }
1392
1393                         public void Remove (object value)
1394                         {
1395                                 if (value == null)
1396                                         return;
1397
1398                                 if (IndexOf (value) == owner.SelectedIndex)
1399                                         owner.SelectedIndex = -1;
1400
1401                                 RemoveAt (IndexOf (value));
1402                         }
1403
1404                         public void RemoveAt (int index)
1405                         {
1406                                 if (index < 0 || index >= Count)
1407                                         throw new ArgumentOutOfRangeException ("Index of out range");
1408
1409                                 if (index == owner.SelectedIndex)
1410                                         owner.SelectedIndex = -1;
1411
1412                                 object_items.RemoveAt (index);
1413                                 owner.UpdatedItems ();
1414                         }
1415                         #endregion Public Methods
1416
1417                         #region Private Methods
1418                         private int AddItem (object item)
1419                         {
1420                                 if (item == null)
1421                                         throw new ArgumentNullException ("item");
1422
1423                                 if (owner.Sorted) {
1424                                         int index = 0;
1425                                         foreach (object o in object_items) {
1426                                                 if (String.Compare (item.ToString (), o.ToString ()) < 0) {
1427                                                         object_items.Insert (index, item);
1428                                                         return index;
1429                                                 }
1430                                                 index++;
1431                                         }
1432                                 }
1433                                 object_items.Add (item);
1434                                 return object_items.Count - 1;
1435                         }
1436
1437                         internal void AddRange (IList items)
1438                         {
1439                                 foreach (object mi in items)
1440                                         AddItem (mi);
1441
1442                                 owner.UpdatedItems ();
1443                         }
1444
1445                         internal void Sort ()
1446                         {
1447                                 object_items.Sort ();
1448                         }
1449
1450                         #endregion Private Methods
1451                 }
1452
1453                 internal class ComboTextBox : TextBox {
1454
1455                         private ComboBox owner;
1456
1457                         public ComboTextBox (ComboBox owner)
1458                         {
1459                                 this.owner = owner;
1460                                 ShowSelection = false;
1461                         }
1462
1463                         internal void SetSelectable (bool selectable)
1464                         {
1465                                 SetStyle (ControlStyles.Selectable, selectable);
1466                         }
1467
1468                         internal void ActivateCaret (bool active)
1469                         {
1470                                 if (active)
1471                                         document.CaretHasFocus ();
1472                                 else
1473                                         document.CaretLostFocus ();
1474                         }
1475
1476                         internal override void OnGotFocusInternal (EventArgs e)
1477                         {
1478                                 owner.Select (false, true);
1479                         }
1480
1481                         internal override void OnLostFocusInternal (EventArgs e)
1482                         {
1483                                 owner.Select (false, true);
1484                         }
1485                 }
1486
1487                 internal class ComboListBox : Control
1488                 {
1489                         private ComboBox owner;
1490                         private VScrollBarLB vscrollbar_ctrl;
1491                         private int top_item;                   /* First item that we show the in the current page */
1492                         private int last_item;                  /* Last visible item */
1493                         internal int page_size;                 /* Number of listbox items per page */
1494                         private Rectangle textarea_drawable;    /* Rectangle of the drawable text area */
1495
1496                         internal enum ItemNavigation
1497                         {
1498                                 First,
1499                                 Last,
1500                                 Next,
1501                                 Previous,
1502                                 NextPage,
1503                                 PreviousPage,
1504                         }
1505
1506                         class VScrollBarLB : VScrollBar
1507                         {
1508                                 public VScrollBarLB ()
1509                                 {
1510                                 }
1511
1512                                 internal override bool InternalCapture {
1513                                         get { return Capture; }
1514                                         set { }
1515                                 }
1516
1517                                 public void FireMouseDown (MouseEventArgs e)
1518                                 {
1519                                         if (Visible) {
1520                                                 e = TranslateEvent (e);
1521                                                 if (ClientRectangle.Contains (e.X, e.Y))
1522                                                         OnMouseDown (e);
1523                                         }
1524                                 }
1525
1526                                 public bool FireMouseUp (MouseEventArgs e)
1527                                 {
1528                                         if (Visible) {
1529                                                 e = TranslateEvent (e);
1530                                                 if (ClientRectangle.Contains (e.X, e.Y)) {
1531                                                         OnMouseUp (e);
1532                                                         return true;
1533                                                 }
1534                                         }
1535                                         return false;
1536                                 }
1537
1538                                 public void FireMouseMove (MouseEventArgs e)
1539                                 {
1540                                         if (Visible) {
1541                                                 e = TranslateEvent (e);
1542                                                 if (ClientRectangle.Contains (e.X, e.Y))
1543                                                         OnMouseMove (e);
1544                                         }
1545                                 }
1546
1547                                 MouseEventArgs TranslateEvent (MouseEventArgs e)
1548                                 {
1549                                         Point loc = PointToClient (Control.MousePosition);
1550                                         return new MouseEventArgs (e.Button, e.Clicks, loc.X, loc.Y, e.Delta);
1551                                 }
1552                         }
1553
1554                         public ComboListBox (ComboBox owner)
1555                         {
1556                                 this.owner = owner;
1557                                 top_item = 0;
1558                                 last_item = 0;
1559                                 page_size = 0;
1560
1561                                 MouseWheel += new MouseEventHandler (OnMouseWheelCLB);
1562
1563                                 SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
1564                                 SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
1565
1566                                 this.is_visible = false;
1567                                 Hwnd.ObjectFromHandle (this.Handle).no_activate = true;
1568
1569                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1570                                         InternalBorderStyle = BorderStyle.Fixed3D;
1571                                 else
1572                                         InternalBorderStyle = BorderStyle.FixedSingle;
1573                         }
1574
1575                         protected override CreateParams CreateParams
1576                         {
1577                                 get {
1578                                         CreateParams cp = base.CreateParams;
1579                                         if (owner == null || owner.DropDownStyle == ComboBoxStyle.Simple)
1580                                                 return cp;
1581
1582                                         cp.Style ^= (int) WindowStyles.WS_CHILD;
1583                                         cp.Style |= (int) WindowStyles.WS_POPUP;
1584                                         cp.ExStyle |= (int) WindowExStyles.WS_EX_TOOLWINDOW | (int) WindowExStyles.WS_EX_TOPMOST;
1585                                         return cp;
1586                                 }
1587                         }
1588
1589                         protected override void Select (bool directed, bool forward)
1590                         {
1591                                 // Do nothing, we never want to be selected
1592                         }
1593
1594                         internal override bool InternalCapture {
1595                                 get {
1596                                         return Capture;
1597                                 }
1598
1599                                 set {
1600                                 }
1601                         }
1602
1603                         int BorderWidth {
1604                                 get {
1605                                         switch (border_style) {
1606                                         case BorderStyle.Fixed3D:
1607                                                 return ThemeEngine.Current.Border3DSize.Width;
1608                                         default:
1609                                                 return ThemeEngine.Current.BorderSize.Width;
1610                                         }
1611                                 }
1612                         }
1613
1614                         #region Private Methods
1615                         // Calcs the listbox area
1616                         internal void CalcListBoxArea ()
1617                         {
1618                                 int width, height;
1619                                 bool show_scrollbar = false;
1620
1621                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1622                                         Rectangle area = owner.listbox_area;
1623                                         width = area.Width;
1624                                         height = area.Height;
1625                                 }
1626                                 else { // DropDown or DropDownList
1627
1628                                         width = owner.DropDownWidth;
1629                                         int count = (owner.Items.Count <= owner.MaxDropDownItems) ? owner.Items.Count : owner.MaxDropDownItems;
1630
1631                                         if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1632                                                 height = 0;
1633                                                 for (int i = 0; i < count; i++) {
1634                                                         height += owner.GetItemHeight (i);
1635                                                 }
1636
1637                                         } else  {
1638                                                 height = owner.ItemHeight * count;
1639                                         }
1640                                 }
1641
1642                                 if (owner.Items.Count <= owner.MaxDropDownItems) {
1643                                         if (vscrollbar_ctrl != null)
1644                                                 vscrollbar_ctrl.Visible = false;
1645                                 } else {
1646                                         /* Need vertical scrollbar */
1647                                         if (vscrollbar_ctrl == null) {
1648                                                 vscrollbar_ctrl = new VScrollBarLB ();
1649                                                 vscrollbar_ctrl.Minimum = 0;
1650                                                 vscrollbar_ctrl.SmallChange = 1;
1651                                                 vscrollbar_ctrl.LargeChange = 1;
1652                                                 vscrollbar_ctrl.Maximum = 0;
1653                                                 vscrollbar_ctrl.ValueChanged += new EventHandler (VerticalScrollEvent);
1654                                                 Controls.AddImplicit (vscrollbar_ctrl);
1655                                         }
1656
1657                                         vscrollbar_ctrl.Height = height - 2 * BorderWidth;
1658
1659                                         vscrollbar_ctrl.Location = new Point (width - vscrollbar_ctrl.Width - BorderWidth - 1, 0);
1660
1661                                         vscrollbar_ctrl.Maximum = owner.Items.Count - (owner.DropDownStyle == ComboBoxStyle.Simple ? page_size : owner.maxdrop_items);
1662                                         vscrollbar_ctrl.LargeChange = owner.MaxDropDownItems - 1;
1663                                         show_scrollbar = vscrollbar_ctrl.Visible = true;
1664
1665                                         int hli = HighlightedIndex;
1666                                         if (hli > 0) {
1667                                                 hli = Math.Min (hli, vscrollbar_ctrl.Maximum);
1668                                                 vscrollbar_ctrl.Value = hli;
1669                                         }
1670                                 }
1671
1672                                 Size = new Size (width, height);
1673                                 textarea_drawable = ClientRectangle;
1674                                 textarea_drawable.Width = width;
1675                                 textarea_drawable.Height = height;
1676
1677                                 if (vscrollbar_ctrl != null && show_scrollbar)
1678                                         textarea_drawable.Width -= vscrollbar_ctrl.Width;
1679
1680                                 last_item = LastVisibleItem ();
1681                                 page_size = textarea_drawable.Height / owner.ItemHeight;
1682                         }
1683
1684                         private void Draw (Rectangle clip, Graphics dc)
1685                         {
1686                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (owner.BackColor), clip);
1687
1688                                 if (owner.Items.Count > 0) {
1689
1690                                         for (int i = top_item; i <= last_item; i++) {
1691                                                 Rectangle item_rect = GetItemDisplayRectangle (i, top_item);
1692
1693                                                 if (!clip.IntersectsWith (item_rect))
1694                                                         continue;
1695
1696                                                 DrawItemState state = DrawItemState.None;
1697
1698                                                 if (i == HighlightedIndex) {
1699                                                         state |= DrawItemState.Selected;
1700
1701                                                         if (owner.DropDownStyle == ComboBoxStyle.DropDownList) {
1702                                                                 state |= DrawItemState.Focus;
1703                                                         }
1704                                                 }
1705
1706                                                 owner.OnDrawItem (new DrawItemEventArgs (dc, owner.Font, item_rect,
1707                                                         i, state, owner.ForeColor, owner.BackColor));
1708                                         }
1709                                 }
1710                         }
1711
1712                         int highlighted_index = -1;
1713
1714                         public int HighlightedIndex {
1715                                 get { return highlighted_index; }
1716                                 set {
1717                                         if (highlighted_index == value)
1718                                                 return;
1719
1720                                         if (highlighted_index != -1 && highlighted_index < this.owner.Items.Count)
1721                                                 Invalidate (GetItemDisplayRectangle (highlighted_index, top_item));
1722                                         highlighted_index = value;
1723                                         if (highlighted_index != -1)
1724                                                 Invalidate (GetItemDisplayRectangle (highlighted_index, top_item));
1725                                 }
1726                         }
1727
1728                         private Rectangle GetItemDisplayRectangle (int index, int top_index)
1729                         {
1730                                 if (index < 0 || index >= owner.Items.Count)
1731                                         throw new  ArgumentOutOfRangeException ("GetItemRectangle index out of range.");
1732
1733                                 Rectangle item_rect = new Rectangle ();
1734                                 int height = owner.GetItemHeight (index);
1735
1736                                 item_rect.X = 0;
1737                                 item_rect.Width = textarea_drawable.Width;
1738                                 if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1739                                         item_rect.Y = 0;
1740                                         for (int i = top_index; i < index; i++)
1741                                                 item_rect.Y += owner.GetItemHeight (i);
1742                                 } else
1743                                         item_rect.Y = height * (index - top_index);
1744
1745                                 item_rect.Height = height;
1746                                 return item_rect;
1747                         }
1748
1749                         public void HideWindow ()
1750                         {
1751                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1752                                         return;
1753
1754                                 Capture = false;
1755                                 Hide ();
1756                                 owner.DropDownListBoxFinished ();
1757                         }
1758
1759                         private int IndexFromPointDisplayRectangle (int x, int y)
1760                         {
1761                                 for (int i = top_item; i <= last_item; i++) {
1762                                         if (GetItemDisplayRectangle (i, top_item).Contains (x, y) == true)
1763                                                 return i;
1764                                 }
1765
1766                                 return -1;
1767                         }
1768
1769                         public void InvalidateItem (int index)
1770                         {
1771                                 if (Visible)
1772                                         Invalidate (GetItemDisplayRectangle (index, top_item));
1773                         }
1774
1775                         private int LastVisibleItem ()
1776                         {
1777                                 Rectangle item_rect;
1778                                 int top_y = textarea_drawable.Y + textarea_drawable.Height;
1779                                 int i = 0;
1780
1781                                 for (i = top_item; i < owner.Items.Count; i++) {
1782                                         item_rect = GetItemDisplayRectangle (i, top_item);
1783                                         if (item_rect.Y + item_rect.Height > top_y) {
1784                                                 return i;
1785                                         }
1786                                 }
1787                                 return i - 1;
1788                         }
1789
1790                         public void SetTopItem (int item)
1791                         {
1792                                 if (top_item == item)
1793                                         return;
1794                                 top_item = item;
1795                                 UpdateLastVisibleItem ();
1796                                 Invalidate ();
1797                         }
1798
1799                         protected override void OnMouseDown (MouseEventArgs e)
1800                         {
1801                                 if (vscrollbar_ctrl != null)
1802                                         vscrollbar_ctrl.FireMouseDown (e);
1803                         }
1804
1805                         protected override void OnMouseMove (MouseEventArgs e)
1806                         {
1807                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1808                                         return;
1809
1810                                 Point pt = PointToClient (Control.MousePosition);
1811                                 int index = IndexFromPointDisplayRectangle (pt.X, pt.Y);
1812
1813                                 if (index != -1) {
1814                                         HighlightedIndex = index;
1815                                         return;
1816                                 }
1817
1818                                 if (vscrollbar_ctrl != null)
1819                                         vscrollbar_ctrl.FireMouseMove (e);
1820                         }
1821
1822                         protected override void OnMouseUp (MouseEventArgs e)
1823                         {
1824                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1825
1826                                 if (index == -1) {
1827                                         if (vscrollbar_ctrl == null || !vscrollbar_ctrl.FireMouseUp (e))
1828                                                 HideWindow ();
1829                                 } else {
1830                                         owner.SelectedIndex = index;
1831                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1832                                         HideWindow ();
1833                                 }
1834
1835                                 if (vscrollbar_ctrl != null)
1836                                         vscrollbar_ctrl.FireMouseUp (e);
1837                         }
1838
1839                         internal override void OnPaintInternal (PaintEventArgs pevent)
1840                         {
1841                                 Draw (pevent.ClipRectangle,pevent.Graphics);
1842                         }
1843
1844                         public bool ShowWindow ()
1845                         {
1846                                 if (owner.DropDownStyle == ComboBoxStyle.Simple && owner.Items.Count == 0)
1847                                         return false;
1848
1849                                 HighlightedIndex = owner.SelectedIndex;
1850
1851                                 CalcListBoxArea ();
1852                                 Show ();
1853
1854                                 Refresh ();
1855                                 owner.OnDropDown (EventArgs.Empty);
1856                                 return true;
1857                         }
1858
1859                         public void UpdateLastVisibleItem ()
1860                         {
1861                                 last_item = LastVisibleItem ();
1862                         }
1863
1864                         public void Scroll (int delta)
1865                         {
1866                                 if (delta == 0 || vscrollbar_ctrl == null || !vscrollbar_ctrl.Visible)
1867                                         return;
1868
1869                                 int max = vscrollbar_ctrl.Maximum;//- (page_size) + 1;
1870
1871                                 int val = vscrollbar_ctrl.Value + delta;
1872                                 if (val > max)
1873                                         val = max;
1874                                 else if (val < vscrollbar_ctrl.Minimum)
1875                                         val = vscrollbar_ctrl.Minimum;
1876                                 vscrollbar_ctrl.Value = val;
1877                         }
1878
1879                         private void OnMouseWheelCLB (object sender, MouseEventArgs me)
1880                         {
1881                                 if (owner.Items.Count == 0)
1882                                         return;
1883
1884                                 int lines = me.Delta / 120 * SystemInformation.MouseWheelScrollLines;
1885                                 Scroll (-lines);
1886                         }
1887
1888                         // Value Changed
1889                         private void VerticalScrollEvent (object sender, EventArgs e)
1890                         {
1891                                 if (top_item == vscrollbar_ctrl.Value)
1892                                         return;
1893
1894                                 top_item =  vscrollbar_ctrl.Value;
1895                                 UpdateLastVisibleItem ();
1896                                 Invalidate ();
1897                         }
1898
1899                         protected override void WndProc(ref Message m) {
1900                                 if (m.Msg == (int)Msg.WM_SETFOCUS) {
1901                                         if (m.WParam != IntPtr.Zero) {
1902                                                 XplatUI.SetFocus(m.WParam);
1903                                         }
1904                                 }
1905                                 base.WndProc (ref m);
1906                         }
1907
1908                         #endregion Private Methods
1909                 }
1910         }
1911 }
1912
1913