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) 2004-2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jordi Mas i Hernandez, jordi@ximian.com
  24 //
  25 //
  26
  27 // NOT COMPLETE
  28
  29 using System;
  30 using System.Drawing;
  31 using System.Collections;
  32 using System.ComponentModel;
  33 using System.Reflection;
  34 using System.ComponentModel.Design;
  35 using System.ComponentModel.Design.Serialization;
  36 using System.Runtime.InteropServices;
  37
  38
  39 namespace System.Windows.Forms
  40 {
  41
  42         [DefaultProperty("Items")]
  43         [DefaultEvent("SelectedIndexChanged")]
  44         [Designer ("System.Windows.Forms.Design.ComboBoxDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  45         public class ComboBox : ListControl
  46         {
  47                 private DrawMode draw_mode;
  48                 private ComboBoxStyle dropdown_style;
  49                 private int dropdown_width;
  50                 private const int preferred_height = 20;
  51                 private int selected_index;
  52                 private object selected_item;
  53                 internal ObjectCollection items = null;
  54                 private bool suspend_ctrlupdate;
  55                 private int maxdrop_items;
  56                 private bool integral_height;
  57                 private bool sorted;
  58                 internal ComboBoxInfo combobox_info;
  59                 private readonly int def_button_width = 16;
  60                 private bool clicked;
  61                 private int max_length;
  62                 private ComboListBox listbox_ctrl;
  63                 private TextBox textbox_ctrl;
  64                 private bool process_textchanged_event;
  65
  66                 [ComVisible(true)]
  67                 public class ChildAccessibleObject : AccessibleObject {
  68                         private ComboBox        owner;
  69                         private IntPtr          handle;
  70
  71                         public ChildAccessibleObject (ComboBox owner, IntPtr handle) {
  72                                 this.owner = owner;
  73                                 this.handle = handle;
  74                         }
  75
  76                         public override string Name {
  77                                 get {
  78                                         return base.Name;
  79                                 }
  80                         }
  81
  82
  83                 }
  84
  85                 internal class ComboBoxInfo
  86                 {
  87                         internal int item_height;               /* Item's height */
  88                         internal Rectangle textarea;            /* Rectangle of the editable text area  */
  89                         internal Rectangle textarea_drawable;   /* Rectangle of the editable text area - decorations - button if present*/
  90                         internal Rectangle button_rect;
  91                         internal bool show_button;              /* Is the DropDown button shown? */
  92                         internal ButtonState button_status;     /* Drop button status */
  93                         internal int original_height;           /* Control's height is recalculated for not Simple Styles */
  94                         internal Rectangle listbox_area;        /* ListBox area in Simple combox, not used in the rest */
  95                         internal bool droppeddown;              /* Is the associated ListBox dropped down? */
  96                         internal int combosimple_height;        /* Simple default height */
  97
  98                         public ComboBoxInfo ()
  99                         {
 100                                 button_status = ButtonState.Normal;
 101                                 show_button = false;
 102                                 item_height = 0;
 103                                 droppeddown = false;
 104                                 original_height = -1;
 105                                 combosimple_height = 150;
 106                         }
 107                 }
 108
 109                 internal class ComboBoxItem
 110                 {
 111                         internal int Index;
 112                         internal int ItemHeight;                /* Only used for OwnerDrawVariable */
 113
 114                         public ComboBoxItem (int index)
 115                         {
 116                                 Index = index;
 117                                 ItemHeight = -1;
 118                         }
 119                 }
 120
 121                 public ComboBox ()
 122                 {
 123                         items = new ObjectCollection (this);
 124                         listbox_ctrl = null;
 125                         textbox_ctrl = null;
 126                         combobox_info = new ComboBoxInfo ();
 127                         combobox_info.item_height = FontHeight + 2;
 128                         dropdown_style = (ComboBoxStyle)(-1);
 129                         DropDownStyle = ComboBoxStyle.DropDown;
 130                         BackColor = ThemeEngine.Current.ColorWindow;
 131                         draw_mode = DrawMode.Normal;
 132                         selected_index = -1;
 133                         selected_item = null;
 134                         maxdrop_items = 8;
 135                         suspend_ctrlupdate = false;
 136                         clicked = false;
 137                         dropdown_width = -1;
 138                         max_length = 0;
 139                         integral_height = true;
 140                         process_textchanged_event = true;
 141                         has_focus = false;
 142
 143                         /* Events */
 144                         MouseDown += new MouseEventHandler (OnMouseDownCB);
 145                         MouseUp += new MouseEventHandler (OnMouseUpCB);
 146                         MouseMove += new MouseEventHandler (OnMouseMoveCB);
 147                         KeyDown +=new KeyEventHandler(OnKeyDownCB);
 148                 }
 149
 150                 #region events
 151
 152                 [Browsable (false)]
 153                 [EditorBrowsable (EditorBrowsableState.Never)]
 154                 public new event EventHandler BackgroundImageChanged;
 155
 156                 public event DrawItemEventHandler DrawItem;
 157                 public event EventHandler DropDown;
 158                 public event EventHandler DropDownStyleChanged;
 159                 public event MeasureItemEventHandler MeasureItem;
 160
 161                 [Browsable (false)]
 162                 [EditorBrowsable (EditorBrowsableState.Never)]
 163                 public new event PaintEventHandler Paint;
 164
 165                 public event EventHandler SelectedIndexChanged;
 166                 public event EventHandler SelectionChangeCommitted;
 167                 #endregion Events
 168
 169                 #region Public Properties
 170                 public override Color BackColor {
 171                         get { return base.BackColor; }
 172                         set {
 173                                 if (base.BackColor == value)
 174                                         return;
 175
 176                                 base.BackColor = value;
 177                                 Refresh ();
 178                         }
 179                 }
 180
 181                 [Browsable (false)]
 182                 [EditorBrowsable (EditorBrowsableState.Never)]
 183                 public override Image BackgroundImage {
 184                         get { return base.BackgroundImage; }
 185                         set {
 186                                 if (base.BackgroundImage == value)
 187                                         return;
 188
 189                                 base.BackgroundImage = value;
 190
 191                                 if (BackgroundImageChanged != null)
 192                                         BackgroundImageChanged (this, EventArgs.Empty);
 193
 194                                 Refresh ();
 195                         }
 196                 }
 197
 198                 protected override CreateParams CreateParams {
 199                         get { return base.CreateParams;}
 200                 }
 201
 202                 protected override Size DefaultSize {
 203                         get { return new Size (121, PreferredHeight); }
 204                 }
 205
 206                 [RefreshProperties(RefreshProperties.Repaint)]
 207                 [DefaultValue (DrawMode.Normal)]
 208                 public DrawMode DrawMode {
 209                         get { return draw_mode; }
 210
 211                         set {
 212                                 if (!Enum.IsDefined (typeof (DrawMode), value))
 213                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for DrawMode", value));
 214
 215                                 if (draw_mode == value)
 216                                         return;
 217
 218                                 draw_mode = value;
 219                                 Refresh ();
 220                         }
 221                 }
 222
 223                 [DefaultValue (ComboBoxStyle.DropDown)]
 224                 [RefreshProperties(RefreshProperties.Repaint)]
 225                 public ComboBoxStyle DropDownStyle {
 226                         get { return dropdown_style; }
 227
 228                         set {
 229
 230                                 if (!Enum.IsDefined (typeof (ComboBoxStyle), value))
 231                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for ComboBoxStyle", value));
 232
 233                                 if (dropdown_style == value)
 234                                         return;
 235
 236                                 if (dropdown_style == ComboBoxStyle.Simple) {
 237                                         if (listbox_ctrl != null) {
 238                                                 Controls.RemoveImplicit (listbox_ctrl);
 239                                                 listbox_ctrl.Dispose ();
 240                                                 listbox_ctrl = null;
 241                                                 Height = combobox_info.original_height;
 242                                         }
 243                                 }
 244
 245                                 if (dropdown_style != ComboBoxStyle.DropDownList && value == ComboBoxStyle.DropDownList) {
 246                                         if (textbox_ctrl != null) {
 247                                                 Controls.RemoveImplicit (textbox_ctrl);
 248                                                 textbox_ctrl.Dispose ();
 249                                                 textbox_ctrl = null;
 250                                         }
 251                                 }
 252
 253                                 dropdown_style = value;
 254
 255                                 if (dropdown_style == ComboBoxStyle.Simple) {
 256                                         CBoxInfo.show_button = false;
 257                                         combobox_info.original_height = Height;
 258                                         Height = combobox_info.combosimple_height;
 259
 260                                         CreateComboListBox ();
 261
 262                                         if (IsHandleCreated == true) {
 263                                                 Controls.AddImplicit (listbox_ctrl);
 264                                         }
 265                                 }
 266                                 else {
 267                                         CBoxInfo.show_button = true;
 268                                         CBoxInfo.button_status = ButtonState.Normal;
 269                                 }
 270
 271                                 if (dropdown_style != ComboBoxStyle.DropDownList && textbox_ctrl == null) {
 272                                         textbox_ctrl = new TextBox ();
 273                                         textbox_ctrl.BorderStyle = BorderStyle.None;
 274                                         textbox_ctrl.TextChanged += new EventHandler (OnTextChangedEdit);
 275                                         textbox_ctrl.KeyPress += new KeyPressEventHandler(textbox_ctrl_KeyPress);
 276                                         textbox_ctrl.GotFocus += new EventHandler(textbox_ctrl_GotFocus);
 277                                         textbox_ctrl.LostFocus += new EventHandler(textbox_ctrl_LostFocus);
 278
 279                                         if (IsHandleCreated == true) {
 280                                                 Controls.AddImplicit (textbox_ctrl);
 281                                         }
 282                                 }
 283
 284                                 if (DropDownStyleChanged  != null)
 285                                         DropDownStyleChanged (this, EventArgs.Empty);
 286
 287                                 CalcTextArea ();
 288                                 Refresh ();
 289                         }
 290                 }
 291
 292                 public int DropDownWidth {
 293                         get {
 294                                 if (dropdown_width == -1)
 295                                         return Width;
 296
 297                                 return dropdown_width;
 298                         }
 299                         set {
 300                                 if (dropdown_width == value)
 301                                         return;
 302
 303                                 if (value < 1)
 304                                         throw new ArgumentException ("The DropDownWidth value is less than one");
 305
 306                                 dropdown_width = value;
 307                         }
 308                 }
 309
 310                 [Browsable (false)]
 311                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 312                 public bool DroppedDown {
 313                         get {
 314                                 if (dropdown_style == ComboBoxStyle.Simple)
 315                                         return true;
 316
 317                                 return CBoxInfo.droppeddown;
 318                         }
 319                         set {
 320                                 if (dropdown_style == ComboBoxStyle.Simple)
 321                                         return;
 322
 323
 324                                 if (value == true) {
 325                                         DropDownListBox ();
 326                                 }
 327                                 else {
 328                                         listbox_ctrl.Hide ();
 329                                 }
 330
 331                                 if (DropDown != null)
 332                                         DropDown (this, EventArgs.Empty);
 333                         }
 334                 }
 335
 336                 public override bool Focused {
 337                         get { return base.Focused; }
 338                 }
 339
 340                 public override Color ForeColor {
 341                         get { return base.ForeColor; }
 342                         set {
 343                                 if (base.ForeColor == value)
 344                                         return;
 345
 346                                 base.ForeColor = value;
 347                                 Refresh ();
 348                         }
 349                 }
 350
 351                 [DefaultValue (true)]
 352                 [Localizable (true)]
 353                 public bool IntegralHeight {
 354                         get { return integral_height; }
 355                         set {
 356                                 if (integral_height == value)
 357                                         return;
 358
 359                                 integral_height = value;
 360                                 Refresh ();
 361                         }
 362                 }
 363
 364                 [Localizable (true)]
 365                 public int ItemHeight {
 366                         get { return combobox_info.item_height; }
 367                         set {
 368                                 if (value < 0)
 369                                         throw new ArgumentException ("The item height value is less than zero");
 370
 371                                 combobox_info.item_height = value;
 372                                 CalcTextArea ();
 373                                 Refresh ();
 374                         }
 375                 }
 376
 377                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 378                 [Localizable (true)]
 379                 [Editor ("System.Windows.Forms.Design.ListControlStringCollectionEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 380                 public ComboBox.ObjectCollection Items {
 381                         get { return items; }
 382                 }
 383
 384                 [DefaultValue (8)]
 385                 [Localizable (true)]
 386                 public int MaxDropDownItems {
 387                         get { return maxdrop_items; }
 388                         set {
 389                                 if (maxdrop_items == value)
 390                                         return;
 391
 392                                 maxdrop_items = value;
 393                         }
 394                 }
 395
 396                 [DefaultValue (0)]
 397                 [Localizable (true)]
 398                 public int MaxLength {
 399                         get { return max_length; }
 400                         set {
 401                                 if (max_length == value)
 402                                         return;
 403
 404                                 max_length = value;
 405
 406                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 407
 408                                         if (value < 0) {
 409                                                 value = 0;
 410                                         }
 411
 412                                         textbox_ctrl.MaxLength = value;
 413                                 }
 414                         }
 415                 }
 416
 417                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 418                 [Browsable (false)]
 419                 public int PreferredHeight {
 420                         get { return preferred_height; }
 421                 }
 422
 423                 [Browsable (false)]
 424                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 425                 public override int SelectedIndex {
 426                         get { return selected_index; }
 427                         set {
 428                                 if (value <= -2 || value >= Items.Count)
 429                                         throw new ArgumentOutOfRangeException ("Index of out range");
 430
 431                                 if (selected_index == value)
 432                                         return;
 433
 434                                 selected_index = value;
 435
 436                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 437                                         SetControlText (GetItemText (Items[selected_index]));
 438                                 }
 439
 440                                 OnSelectedIndexChanged  (new EventArgs ());
 441                                 OnSelectedValueChanged (new EventArgs ());
 442                                 OnSelectedItemChanged (new EventArgs ());
 443                                 Refresh ();
 444                         }
 445                 }
 446
 447                 [Browsable (false)]
 448                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 449                 [Bindable(true)]
 450                 public object SelectedItem {
 451                         get {
 452                                 if (selected_index !=-1 && Items !=null && Items.Count > 0)
 453                                         return Items[selected_index];
 454                                 else
 455                                         return null;
 456                                 }
 457                         set {
 458                                 int index = Items.IndexOf (value);
 459
 460                                 if (index == -1)
 461                                         return;
 462
 463                                 if (selected_index == index)
 464                                         return;
 465
 466                                 selected_index = index;
 467
 468                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 469                                         SetControlText (GetItemText (Items[selected_index]));
 470                                 }
 471
 472                                 OnSelectedItemChanged  (new EventArgs ());
 473                                 Refresh ();
 474                         }
 475                 }
 476
 477                 [Browsable (false)]
 478                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 479                 public string SelectedText {
 480                         get {
 481                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 482                                         return "";
 483
 484                                 return textbox_ctrl.SelectedText;
 485                         }
 486                         set {
 487                                 if (dropdown_style == ComboBoxStyle.DropDownList) {
 488                                         return;
 489                                 }
 490
 491                                 textbox_ctrl.SelectedText = value;
 492                         }
 493                 }
 494
 495                 [Browsable (false)]
 496                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 497                 public int SelectionLength {
 498                         get {
 499                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 500                                         return 0;
 501
 502                                 return textbox_ctrl.SelectionLength;
 503                         }
 504                         set {
 505                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 506                                         return;
 507
 508                                 if (textbox_ctrl.SelectionLength == value)
 509                                         return;
 510
 511                                 textbox_ctrl.SelectionLength = value;
 512                         }
 513                 }
 514
 515                 [Browsable (false)]
 516                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 517                 public int SelectionStart {
 518                         get {
 519                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 520                                         return 0;
 521
 522                                 return textbox_ctrl.SelectionStart;
 523                         }
 524                         set {
 525                                 if (dropdown_style == ComboBoxStyle.DropDownList)
 526                                         return;
 527
 528                                 if (textbox_ctrl.SelectionStart == value)
 529                                         return;
 530
 531                                 textbox_ctrl.SelectionStart = value;
 532                         }
 533                 }
 534
 535                 [DefaultValue (false)]
 536                 public bool Sorted {
 537                         get { return sorted; }
 538
 539                         set {
 540                                 if (sorted == value)
 541                                         return;
 542
 543                                 sorted = value;
 544                         }
 545                 }
 546
 547                 [Bindable (true)]
 548                 [Localizable (true)]
 549                 public override string Text {
 550                         get {
 551                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 552                                         if (textbox_ctrl != null) {
 553                                                 return textbox_ctrl.Text;
 554                                         }
 555                                 }
 556
 557                                 if (SelectedItem != null)  {
 558                                         return GetItemText (SelectedItem);
 559                                 }
 560
 561                                 return base.Text;
 562                         }
 563                         set {
 564                                 if (value == null) {
 565                                         SelectedIndex = -1;
 566                                         return;
 567                                 }
 568
 569                                 int index = FindString (value);
 570
 571                                 if (index != -1) {
 572                                         SelectedIndex = index;
 573                                         return;
 574                                 }
 575
 576                                 if (dropdown_style != ComboBoxStyle.DropDownList) {
 577                                         textbox_ctrl.Text = GetItemText (value);
 578                                 }
 579                         }
 580                 }
 581
 582                 #endregion Public Properties
 583
 584                 #region Private Properties
 585                 internal ComboBoxInfo CBoxInfo {
 586                         get { return combobox_info; }
 587                 }
 588
 589                 #endregion Private Properties
 590
 591                 #region Public Methods
 592                 protected virtual void AddItemsCore (object[] value)
 593                 {
 594
 595                 }
 596
 597                 public void BeginUpdate ()
 598                 {
 599                         suspend_ctrlupdate = true;
 600                 }
 601
 602                 protected override void Dispose (bool disposing)
 603                 {
 604                         if (disposing == true) {
 605                                 if (listbox_ctrl != null) {
 606                                         listbox_ctrl.Dispose ();
 607                                         Controls.RemoveImplicit (listbox_ctrl);
 608                                         listbox_ctrl = null;
 609                                 }
 610
 611                                 if (textbox_ctrl != null) {
 612                                         Controls.RemoveImplicit (textbox_ctrl);
 613                                         textbox_ctrl.Dispose ();
 614                                         textbox_ctrl = null;
 615                                 }
 616                         }
 617
 618                         base.Dispose (disposing);
 619                 }
 620
 621                 public void EndUpdate ()
 622                 {
 623                         suspend_ctrlupdate = false;
 624                         UpdatedItems ();
 625                 }
 626
 627                 public int FindString (string s)
 628                 {
 629                         return FindString (s, -1);
 630                 }
 631
 632                 public int FindString (string s, int startIndex)
 633                 {
 634                         if (Items.Count == 0)
 635                                 return -1; // No exception throwing if empty
 636
 637                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 638                                 throw new  ArgumentOutOfRangeException ("Index of out range");
 639
 640                         startIndex++;
 641                         for (int i = startIndex; i < Items.Count; i++) {
 642                                 if ((GetItemText (Items[i])).StartsWith (s))
 643                                         return i;
 644                         }
 645
 646                         return -1;
 647                 }
 648
 649                 public int FindStringExact (string s)
 650                 {
 651                         return FindStringExact (s, -1);
 652                 }
 653
 654                 public int FindStringExact (string s, int startIndex)
 655                 {
 656                         if (Items.Count == 0)
 657                                 return -1; // No exception throwing if empty
 658
 659                         if (startIndex < -1 || startIndex >= Items.Count - 1)
 660                                 throw new ArgumentOutOfRangeException ("Index of out range");
 661
 662                         startIndex++;
 663                         for (int i = startIndex; i < Items.Count; i++) {
 664                                 if ((GetItemText (Items[i])).Equals (s))
 665                                         return i;
 666                         }
 667
 668                         return -1;
 669                 }
 670
 671                 public int GetItemHeight (int index)
 672                 {
 673                         if (DrawMode == DrawMode.OwnerDrawVariable && IsHandleCreated == true) {
 674
 675                                 if (index < 0 || index >= Items.Count )
 676                                         throw new ArgumentOutOfRangeException ("The item height value is less than zero");
 677
 678                                 if ((Items.GetComboBoxItem (index)).ItemHeight != -1) {
 679                                         return (Items.GetComboBoxItem (index)).ItemHeight;
 680                                 }
 681
 682                                 MeasureItemEventArgs args = new MeasureItemEventArgs (DeviceContext, index, ItemHeight);
 683                                 OnMeasureItem (args);
 684                                 (Items.GetComboBoxItem (index)).ItemHeight = args.ItemHeight;
 685                                 return args.ItemHeight;
 686                         }
 687
 688                         return ItemHeight;
 689                 }
 690
 691                 protected override bool IsInputKey (Keys keyData)
 692                 {
 693                         switch (keyData) {
 694                         case Keys.Up:
 695                         case Keys.Down:
 696                         case Keys.PageUp:
 697                         case Keys.PageDown:
 698                                 return true;
 699
 700                         default:
 701                                 return false;
 702                         }
 703                 }
 704
 705                 protected override void OnBackColorChanged (EventArgs e)
 706                 {
 707                         base.OnBackColorChanged (e);
 708                 }
 709
 710                 protected override void OnDataSourceChanged (EventArgs e)
 711                 {
 712                         base.OnDataSourceChanged (e);
 713                         BindDataItems (items);
 714
 715                         if (DataSource == null || DataManager == null) {
 716                                 SelectedIndex = -1;
 717                         }
 718                         else {
 719                                 SelectedIndex = DataManager.Position;
 720                         }
 721                 }
 722
 723                 protected override void OnDisplayMemberChanged (EventArgs e)
 724                 {
 725                         base.OnDisplayMemberChanged (e);
 726
 727                         if (DataManager == null || !IsHandleCreated)
 728                                return;
 729
 730                         BindDataItems (items);
 731                         SelectedIndex = DataManager.Position;
 732                 }
 733
 734                 protected virtual void OnDrawItem (DrawItemEventArgs e)
 735                 {
 736                         if (DrawItem != null && (DrawMode == DrawMode.OwnerDrawFixed || DrawMode == DrawMode.OwnerDrawVariable)) {
 737                                 DrawItem (this, e);
 738                                 return;
 739                         }
 740
 741                         ThemeEngine.Current.DrawComboBoxItem (this, e);
 742                 }
 743
 744                 protected virtual void OnDropDown (EventArgs e)
 745                 {
 746                         if (DropDown != null)
 747                                 DropDown (this, e);
 748                 }
 749
 750                 protected virtual void OnDropDownStyleChanged (EventArgs e)
 751                 {
 752                         if (DropDownStyleChanged != null)
 753                                 DropDownStyleChanged (this, e);
 754                 }
 755
 756                 protected override void OnFontChanged (EventArgs e)
 757                 {
 758                         base.OnFontChanged (e);
 759
 760                         if (textbox_ctrl != null) {
 761                                 textbox_ctrl.Font = Font;
 762                         }
 763
 764                         combobox_info.item_height = FontHeight + 2;
 765                         CalcTextArea ();
 766                 }
 767
 768                 protected override void OnForeColorChanged (EventArgs e)
 769                 {
 770                         base.OnForeColorChanged (e);
 771                 }
 772
 773                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 774                 protected override void OnGotFocus (EventArgs e) {
 775                         has_focus = true;
 776                         Invalidate ();
 777                 }
 778
 779                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 780                 protected override void OnLostFocus (EventArgs e) {
 781                         has_focus = false;
 782                         Invalidate ();
 783                 }
 784
 785                 protected override void OnHandleCreated (EventArgs e)
 786                 {
 787                         base.OnHandleCreated (e);
 788
 789                         if (listbox_ctrl != null) {
 790                                 Controls.AddImplicit (listbox_ctrl);
 791
 792                                 if (dropdown_style == ComboBoxStyle.Simple)
 793                                         Height = combobox_info.combosimple_height;
 794
 795                         }
 796
 797                         if (textbox_ctrl != null) {
 798                                 Controls.AddImplicit (textbox_ctrl);
 799                         }
 800
 801                         CalcTextArea ();
 802                 }
 803
 804                 protected override void OnHandleDestroyed (EventArgs e)
 805                 {
 806                         base.OnHandleDestroyed (e);
 807                 }
 808
 809                 protected override void OnKeyPress (KeyPressEventArgs e)
 810                 {
 811                         base.OnKeyPress (e);
 812                 }
 813
 814                 protected virtual void OnMeasureItem (MeasureItemEventArgs e)
 815                 {
 816                         if (MeasureItem != null)
 817                                 MeasureItem (this, e);
 818                 }
 819
 820                 protected override void OnParentBackColorChanged (EventArgs e)
 821                 {
 822                         base.OnParentBackColorChanged (e);
 823                 }
 824
 825                 protected override void OnResize (EventArgs e)
 826                 {
 827                         base.OnResize (e);
 828                         AdjustHeightForDropDown ();
 829
 830                         if (listbox_ctrl != null)
 831                                 listbox_ctrl.CalcListBoxArea ();
 832
 833                         CalcTextArea ();
 834                 }
 835
 836                 protected override void OnSelectedIndexChanged (EventArgs e)
 837                 {
 838                         base.OnSelectedIndexChanged (e);
 839
 840                         if (SelectedIndexChanged != null)
 841                                 SelectedIndexChanged (this, e);
 842                 }
 843
 844                 protected virtual void OnSelectedItemChanged (EventArgs e)
 845                 {
 846
 847                 }
 848
 849                 protected override void OnSelectedValueChanged (EventArgs e)
 850                 {
 851                         base.OnSelectedValueChanged (e);
 852                 }
 853
 854                 protected virtual void OnSelectionChangeCommitted (EventArgs e)
 855                 {
 856                         if (SelectionChangeCommitted != null)
 857                                 SelectionChangeCommitted (this, e);
 858                 }
 859
 860                 protected override void RefreshItem (int index)
 861                 {
 862                         if (index < 0 || index >= Items.Count)
 863                                 throw new ArgumentOutOfRangeException ("Index of out range");
 864
 865                         if (draw_mode == DrawMode.OwnerDrawVariable) {
 866                                 (Items.GetComboBoxItem (index)).ItemHeight = -1;
 867                         }
 868                 }
 869
 870                 public void Select (int start, int lenght)
 871                 {
 872                         if (start < 0)
 873                                 throw new ArgumentException ("Start cannot be less than zero");
 874
 875                         if (lenght < 0)
 876                                 throw new ArgumentException ("Start cannot be less than zero");
 877
 878                         if (dropdown_style == ComboBoxStyle.DropDownList)
 879                                 return;
 880
 881                         textbox_ctrl.Select (start, lenght);
 882                 }
 883
 884                 public void SelectAll ()
 885                 {
 886                         if (dropdown_style == ComboBoxStyle.DropDownList)
 887                                 return;
 888
 889                         textbox_ctrl.SelectAll ();
 890                 }
 891
 892                 protected override void SetBoundsCore (int x, int y, int width, int height, BoundsSpecified specified)
 893                 {
 894                         base.SetBoundsCore (x, y, width, height, specified);
 895                 }
 896
 897                 protected override void SetItemCore (int index, object value)
 898                 {
 899                         if (index < 0 || index >= Items.Count)
 900                                 return;
 901
 902                         Items[index] = value;
 903                 }
 904
 905                 protected override void SetItemsCore (IList value)
 906                 {
 907                         Items.AddRange (value);
 908                 }
 909
 910                 public override string ToString ()
 911                 {
 912                         return base.ToString () + ", Items.Count:" + Items.Count;
 913                 }
 914
 915                 protected override void WndProc (ref Message m)
 916                 {
 917
 918                         switch ((Msg) m.Msg) {
 919
 920                         case Msg.WM_PAINT: {
 921                                 PaintEventArgs  paint_event;
 922                                 paint_event = XplatUI.PaintEventStart (Handle, true);
 923                                 OnPaintCB (paint_event);
 924                                 XplatUI.PaintEventEnd (Handle, true);
 925                                 return;
 926                         }
 927
 928                         case Msg.WM_ERASEBKGND:
 929                                 m.Result = (IntPtr) 1;
 930                                 return;
 931
 932                         default:
 933                                 break;
 934                         }
 935
 936                         base.WndProc (ref m);
 937
 938                 }
 939
 940                 #endregion Public Methods
 941
 942                 #region Private Methods
 943
 944                 private void AdjustHeightForDropDown ()
 945                 {
 946                         if (dropdown_style == ComboBoxStyle.Simple)
 947                                 return;
 948
 949                         int new_height = combobox_info.item_height + ThemeEngine.Current.DrawComboBoxEditDecorationTop () +
 950                                 ThemeEngine.Current.DrawComboBoxEditDecorationBottom () + 2;
 951
 952                         if (Height == new_height)
 953                                 return;
 954
 955                         combobox_info.original_height = Height;
 956                         Height = new_height;
 957                 }
 958
 959                 private void textbox_ctrl_KeyPress(object sender, KeyPressEventArgs e)
 960                 {
 961                         OnKeyPress (e);
 962                 }
 963
 964                 private void textbox_ctrl_GotFocus(object sender, EventArgs e )
 965                 {
 966                         OnGotFocus(e);
 967                 }
 968
 969                 private void textbox_ctrl_LostFocus(object sender, EventArgs e )
 970                 {
 971                         OnLostFocus(e);
 972                 }
 973
 974                 // Calcs the text area size
 975                 internal void CalcTextArea ()
 976                 {
 977                         combobox_info.textarea = ClientRectangle;
 978
 979                         /* Edit area */
 980                         combobox_info.textarea.Height = ItemHeight + ThemeEngine.Current.DrawComboBoxEditDecorationTop () +
 981                                         ThemeEngine.Current.DrawComboBoxEditDecorationBottom () + 2;
 982                                         // TODO: Does the +2 change at different font resolutions?
 983
 984                         /* Edit area - minus decorations (text drawable area) */
 985                         combobox_info.textarea_drawable = combobox_info.textarea;
 986                         combobox_info.textarea_drawable.Y += ThemeEngine.Current.DrawComboBoxEditDecorationTop ();
 987                         combobox_info.textarea_drawable.X += ThemeEngine.Current.DrawComboBoxEditDecorationLeft ();
 988                         combobox_info.textarea_drawable.Height -= ThemeEngine.Current.DrawComboBoxEditDecorationBottom ();
 989                         combobox_info.textarea_drawable.Height -= ThemeEngine.Current.DrawComboBoxEditDecorationTop();
 990                         combobox_info.textarea_drawable.Width -= ThemeEngine.Current.DrawComboBoxEditDecorationRight ();
 991                         combobox_info.textarea_drawable.Width -= ThemeEngine.Current.DrawComboBoxEditDecorationLeft ();
 992
 993                         /* Non-drawable area */
 994                         Region area = new Region (ClientRectangle);
 995                         area.Exclude (combobox_info.textarea);
 996                         RectangleF bounds = area.GetBounds (DeviceContext);
 997                         combobox_info.listbox_area = new Rectangle ((int)bounds.X, (int)bounds.Y,
 998                                 (int)bounds.Width, (int)bounds.Height);
 999
1000                         if (CBoxInfo.show_button) {
1001                                 combobox_info.textarea_drawable.Width -= def_button_width;
1002
1003                                 combobox_info.button_rect = new Rectangle (combobox_info.textarea_drawable.X + combobox_info.textarea_drawable.Width,
1004                                         combobox_info.textarea_drawable.Y, def_button_width, combobox_info.textarea_drawable.Height);
1005
1006                         }
1007
1008                         if (dropdown_style != ComboBoxStyle.DropDownList) { /* There is an edit control*/
1009                                 if (textbox_ctrl != null) {
1010                                         textbox_ctrl.Location = new Point (combobox_info.textarea_drawable.X, combobox_info.textarea_drawable.Y);
1011                                         textbox_ctrl.Size = new Size (combobox_info.textarea_drawable.Width, combobox_info.textarea_drawable.Height);
1012                                 }
1013                         }
1014
1015                         if (listbox_ctrl != null && dropdown_style == ComboBoxStyle.Simple) {
1016                                 listbox_ctrl.Location = new Point (combobox_info.textarea.X, combobox_info.textarea.Y +
1017                                         combobox_info.textarea.Height);
1018                                 listbox_ctrl.CalcListBoxArea ();
1019                         }
1020
1021                         area.Dispose ();
1022                 }
1023
1024                 private void CreateComboListBox ()
1025                 {
1026                         listbox_ctrl = new ComboListBox (this);
1027                 }
1028
1029                 internal void Draw (Rectangle clip, Graphics dc)
1030                 {
1031                         // No edit control, we paint the edit ourselfs
1032                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1033                                 DrawItemState state = DrawItemState.None;
1034                                 Rectangle item_rect = combobox_info.textarea_drawable;
1035                                 item_rect.Height = ItemHeight + 2;
1036
1037                                 if (has_focus == true) {
1038                                         state = DrawItemState.Selected;
1039                                         state |= DrawItemState.Focus;
1040                                 }
1041
1042                                 state |= DrawItemState.ComboBoxEdit;
1043                                 OnDrawItem (new DrawItemEventArgs (dc, Font, item_rect,
1044                                                         selected_index, state, ForeColor, BackColor));
1045                         }
1046
1047                         if (DropDownStyle == ComboBoxStyle.Simple && clip.IntersectsWith (combobox_info.listbox_area) == true) {
1048                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (Parent.BackColor),
1049                                                 combobox_info.listbox_area);
1050                         }
1051
1052                         if (CBoxInfo.show_button) {
1053                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (ThemeEngine.Current.ColorControl),
1054                                         combobox_info.button_rect);
1055
1056                                 ThemeEngine.Current.CPDrawComboButton (dc,
1057                                         combobox_info.button_rect, combobox_info.button_status);
1058                         }
1059
1060                         ThemeEngine.Current.DrawComboBoxEditDecorations (dc, this, combobox_info.textarea);
1061                 }
1062
1063                 internal void DropDownListBox ()
1064                 {
1065                         if (DropDownStyle == ComboBoxStyle.Simple)
1066                                 return;
1067
1068                         if (listbox_ctrl == null) {
1069                                 CreateComboListBox ();
1070                         }
1071
1072                         listbox_ctrl.Location = PointToScreen (new Point (combobox_info.textarea.X, combobox_info.textarea.Y +
1073                                 combobox_info.textarea.Height));
1074
1075                         if (listbox_ctrl.ShowWindow () == true) {
1076                                 CBoxInfo.droppeddown = true;
1077                         }
1078
1079                         combobox_info.button_status = ButtonState.Pushed;
1080                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1081                                 Invalidate (combobox_info.textarea_drawable);
1082                         }
1083                 }
1084
1085                 internal void DropDownListBoxFinished ()
1086                 {
1087                         if (DropDownStyle == ComboBoxStyle.Simple)
1088                                 return;
1089
1090                         combobox_info.button_status = ButtonState.Normal;
1091                         Invalidate (combobox_info.button_rect);
1092                         CBoxInfo.droppeddown = false;
1093                         clicked = false;
1094                 }
1095
1096                 private int FindStringCaseInsensitive (string search)
1097                 {
1098                         if (search.Length == 0) {
1099                                 return -1;
1100                         }
1101
1102                         for (int i = 0; i < Items.Count; i++)
1103                         {
1104                                 if (String.Compare (GetItemText (Items[i]), 0, search, 0, search.Length, true) == 0)
1105                                         return i;
1106                         }
1107
1108                         return -1;
1109                 }
1110
1111                 private void OnKeyDownCB(object sender, KeyEventArgs e)
1112                 {
1113                         switch (e.KeyCode)
1114                         {
1115                                 case Keys.Up:
1116                                         SelectedIndex = Math.Max(SelectedIndex-1, 0);
1117                                         break;
1118
1119                                 case Keys.Down:
1120                                         SelectedIndex = Math.Min(SelectedIndex+1, Items.Count-1);
1121                                         break;
1122
1123                                 case Keys.PageUp:
1124                                         if (listbox_ctrl != null)
1125                                                 SelectedIndex = Math.Max(SelectedIndex- (listbox_ctrl.page_size-1), 0);
1126                                         break;
1127
1128                                 case Keys.PageDown:
1129                                         if (listbox_ctrl != null)
1130                                                 SelectedIndex = Math.Min(SelectedIndex+(listbox_ctrl.page_size-1), Items.Count-1);
1131                                         break;
1132
1133                                 default:
1134                                         break;
1135                         }
1136                 }
1137
1138                 internal virtual void OnMouseDownCB (object sender, MouseEventArgs e)
1139                 {
1140                         /* Click On button*/
1141                         Rectangle hit_rect;
1142
1143                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1144                                 hit_rect = combobox_info.textarea;
1145                         } else {
1146                                 hit_rect = combobox_info.button_rect;
1147                         }
1148
1149                         if (hit_rect.Contains (e.X, e.Y)) {
1150                                 if (clicked == false) {
1151                                         clicked = true;
1152                                         DropDownListBox ();
1153                                 } else {
1154                                         listbox_ctrl.Hide ();
1155                                         DropDownListBoxFinished ();
1156                                 }
1157
1158                                 Invalidate (combobox_info.button_rect);
1159                         }
1160                 }
1161
1162                 internal virtual void OnMouseMoveCB (object sender, MouseEventArgs e)
1163                 {
1164                         /* When there are no items, act as a regular button */
1165                         if (clicked == true && Items.Count == 0 &&
1166                                  combobox_info.button_rect.Contains (e.X, e.Y) == false) {
1167                                 DropDownListBoxFinished ();
1168                         }
1169                 }
1170
1171                 internal virtual void OnMouseUpCB (object sender, MouseEventArgs e)
1172                 {
1173                         /* Click on button*/
1174                         if (clicked == true && combobox_info.button_rect.Contains (e.X, e.Y)) {
1175                                 DropDownListBoxFinished ();
1176                         }
1177                 }
1178
1179                 private void OnPaintCB (PaintEventArgs pevent)
1180                 {
1181                         if (Width <= 0 || Height <=  0 || Visible == false || suspend_ctrlupdate == true)
1182                                 return;
1183
1184                         /* Copies memory drawing buffer to screen*/
1185                         Draw (ClientRectangle, pevent.Graphics);
1186
1187                         if (Paint != null)
1188                                 Paint (this, pevent);
1189                 }
1190
1191                 private void OnTextChangedEdit (object sender, EventArgs e)
1192                 {
1193                         if (process_textchanged_event == false)
1194                                 return;
1195
1196                         int item = FindStringCaseInsensitive (textbox_ctrl.Text);
1197
1198                         if (item == -1)
1199                                 return;
1200
1201                         listbox_ctrl.SetTopItem (item);
1202                         listbox_ctrl.SetHighLightedItem (Items[item]);
1203                 }
1204
1205                 internal void SetControlText (string s)
1206                 {
1207                         process_textchanged_event = false;
1208                         textbox_ctrl.Text = s;
1209                         process_textchanged_event = true;
1210                 }
1211
1212                 private void UpdatedItems ()
1213                 {
1214                         if (dropdown_style != ComboBoxStyle.Simple)
1215                                 return;
1216
1217                         listbox_ctrl.UpdateLastVisibleItem ();
1218                         listbox_ctrl.CalcListBoxArea ();
1219                         listbox_ctrl.Refresh ();
1220                 }
1221
1222                 #endregion Private Methods
1223
1224
1225                 /*
1226                         ComboBox.ObjectCollection
1227                 */
1228                 [ListBindableAttribute (false)]
1229                 public class ObjectCollection : IList, ICollection, IEnumerable
1230                 {
1231
1232                         private ComboBox owner;
1233                         internal ArrayList object_items = new ArrayList ();
1234                         internal ArrayList combobox_items = new ArrayList ();
1235
1236                         public ObjectCollection (ComboBox owner)
1237                         {
1238                                 this.owner = owner;
1239                         }
1240
1241                         #region Public Properties
1242                         public virtual int Count {
1243                                 get { return object_items.Count; }
1244                         }
1245
1246                         public virtual bool IsReadOnly {
1247                                 get { return false; }
1248                         }
1249
1250                         [Browsable (false)]
1251                         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
1252                         public virtual object this [int index] {
1253                                 get {
1254                                         if (index < 0 || index >= Count)
1255                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1256
1257                                         return object_items[index];
1258                                 }
1259                                 set {
1260                                         if (index < 0 || index >= Count)
1261                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1262
1263                                         object_items[index] = value;
1264                                 }
1265                         }
1266
1267                         bool ICollection.IsSynchronized {
1268                                 get { return false; }
1269                         }
1270
1271                         object ICollection.SyncRoot {
1272                                 get { return this; }
1273                         }
1274
1275                         bool IList.IsFixedSize {
1276                                 get { return false; }
1277                         }
1278
1279                         #endregion Public Properties
1280
1281                         #region Private Properties
1282                         internal ArrayList ObjectItems {
1283                                 get { return object_items;}
1284                                 set {
1285                                         object_items = value;
1286                                 }
1287                         }
1288
1289                         internal ArrayList ListBoxItems {
1290                                 get { return combobox_items;}
1291                                 set {
1292                                         combobox_items = value;
1293                                 }
1294                         }
1295                         #endregion Private Properties
1296
1297                         #region Public Methods
1298                         public int Add (object item)
1299                         {
1300                                 int idx;
1301
1302                                 idx = AddItem (item);
1303                                 owner.UpdatedItems ();
1304                                 return idx;
1305                         }
1306
1307                         public void AddRange (object[] items)
1308                         {
1309                                 foreach (object mi in items)
1310                                         AddItem (mi);
1311
1312                                 owner.UpdatedItems ();
1313                         }
1314
1315                         public virtual void Clear ()
1316                         {
1317                                 owner.selected_index = -1;
1318                                 object_items.Clear ();
1319                                 combobox_items.Clear ();
1320                                 owner.UpdatedItems ();
1321                                 owner.Refresh ();
1322                         }
1323
1324                         public virtual bool Contains (object obj)
1325                         {
1326                                 return object_items.Contains (obj);
1327                         }
1328
1329                         public void CopyTo (object[] dest, int arrayIndex)
1330                         {
1331                                 object_items.CopyTo (dest, arrayIndex);
1332                         }
1333
1334                         void ICollection.CopyTo (Array dest, int index)
1335                         {
1336                                 object_items.CopyTo (dest, index);
1337                         }
1338
1339                         public virtual IEnumerator GetEnumerator ()
1340                         {
1341                                 return object_items.GetEnumerator ();
1342                         }
1343
1344                         int IList.Add (object item)
1345                         {
1346                                 return Add (item);
1347                         }
1348
1349                         public virtual int IndexOf (object value)
1350                         {
1351                                 return object_items.IndexOf (value);
1352                         }
1353
1354                         public virtual void Insert (int index,  object item)
1355                         {
1356                                 if (index < 0 || index > Count)
1357                                         throw new ArgumentOutOfRangeException ("Index of out range");
1358
1359                                 ObjectCollection new_items = new ObjectCollection (owner);
1360                                 object sel_item = owner.SelectedItem;
1361
1362                                 owner.BeginUpdate ();
1363
1364                                 for (int i = 0; i < index; i++) {
1365                                         new_items.AddItem (ObjectItems[i]);
1366                                 }
1367
1368                                 new_items.AddItem (item);
1369
1370                                 for (int i = index; i < Count; i++){
1371                                         new_items.AddItem (ObjectItems[i]);
1372                                 }
1373
1374                                 ObjectItems = new_items.ObjectItems;
1375                                 ListBoxItems = new_items.ListBoxItems;
1376
1377                                 if (sel_item != null) {
1378                                         int idx = IndexOf (sel_item);
1379                                         owner.selected_index = idx;
1380                                         owner.listbox_ctrl.SetHighLightedItem (owner.Items[idx]);
1381                                 }
1382
1383                                 owner.EndUpdate ();     // Calls UpdatedItems
1384                         }
1385
1386                         public virtual void Remove (object value)
1387                         {
1388                                 if (IndexOf (value) == owner.SelectedIndex)
1389                                         owner.SelectedItem = null;
1390
1391                                 RemoveAt (IndexOf (value));
1392
1393                         }
1394
1395                         public virtual void RemoveAt (int index)
1396                         {
1397                                 if (index < 0 || index >= Count)
1398                                         throw new ArgumentOutOfRangeException ("Index of out range");
1399
1400                                 if (index == owner.SelectedIndex)
1401                                         owner.SelectedItem = null;
1402
1403                                 object_items.RemoveAt (index);
1404                                 combobox_items.RemoveAt (index);
1405                                 owner.UpdatedItems ();
1406                         }
1407                         #endregion Public Methods
1408
1409                         #region Private Methods
1410                         private int AddItem (object item)
1411                         {
1412                                 int cnt = object_items.Count;
1413                                 object_items.Add (item);
1414                                 combobox_items.Add (new ComboBox.ComboBoxItem (cnt));
1415                                 return cnt;
1416                         }
1417
1418                         internal void AddRange (IList items)
1419                         {
1420                                 foreach (object mi in items)
1421                                         AddItem (mi);
1422
1423                                 owner.UpdatedItems ();
1424                         }
1425
1426                         internal ComboBox.ComboBoxItem GetComboBoxItem (int index)
1427                         {
1428                                 if (index < 0 || index >= Count)
1429                                         throw new ArgumentOutOfRangeException ("Index of out range");
1430
1431                                 return (ComboBox.ComboBoxItem) combobox_items[index];
1432                         }
1433
1434                         internal void SetComboBoxItem (ComboBox.ComboBoxItem item, int index)
1435                         {
1436                                 if (index < 0 || index >= Count)
1437                                         throw new ArgumentOutOfRangeException ("Index of out range");
1438
1439                                 combobox_items[index] = item;
1440                         }
1441
1442                         #endregion Private Methods
1443                 }
1444
1445                 /*
1446                         class ComboListBox
1447                 */
1448                 internal class ComboListBox : Control
1449                 {
1450                         private ComboBox owner;
1451                         private VScrollBarLB vscrollbar_ctrl;
1452                         private int top_item;                   /* First item that we show the in the current page */
1453                         private int last_item;                  /* Last visible item */
1454                         public object highlighted_item; /* Item that is currently selected */
1455                         internal int page_size;                 /* Number of listbox items per page */
1456                         private Rectangle textarea_drawable;    /* Rectangle of the drawable text area */
1457
1458                         internal enum ItemNavigation
1459                         {
1460                                 First,
1461                                 Last,
1462                                 Next,
1463                                 Previous,
1464                                 NextPage,
1465                                 PreviousPage,
1466                         }
1467
1468                         class VScrollBarLB : VScrollBar
1469                         {
1470                                 public VScrollBarLB ()
1471                                 {
1472                                 }
1473
1474                                 public void FireMouseDown (MouseEventArgs e)
1475                                 {
1476                                         OnMouseDown (e);
1477                                 }
1478
1479                                 public void FireMouseUp (MouseEventArgs e)
1480                                 {
1481                                         OnMouseUp (e);
1482                                 }
1483
1484                                 public void FireMouseMove (MouseEventArgs e)
1485                                 {
1486                                         OnMouseMove (e);
1487                                 }
1488
1489                         }
1490
1491                         public ComboListBox (ComboBox owner) : base ()
1492                         {
1493                                 this.owner = owner;
1494                                 top_item = 0;
1495                                 last_item = 0;
1496                                 page_size = 0;
1497                                 highlighted_item = null;
1498
1499                                 MouseDown += new MouseEventHandler (OnMouseDownPUW);
1500                                 MouseUp += new MouseEventHandler (OnMouseUpPUW);
1501                                 MouseMove += new MouseEventHandler (OnMouseMovePUW);
1502                                 KeyDown += new KeyEventHandler (OnKeyDownPUW);
1503                                 Paint += new PaintEventHandler (OnPaintPUW);
1504                                 SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
1505                                 SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
1506                         }
1507
1508                         protected override CreateParams CreateParams
1509                         {
1510                                 get {
1511                                         CreateParams cp = base.CreateParams;
1512                                         if (owner != null && owner.DropDownStyle != ComboBoxStyle.Simple) {
1513                                                 cp.Style = unchecked ((int)(WindowStyles.WS_POPUP | WindowStyles.WS_VISIBLE | WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN));
1514                                                 cp.ExStyle |= (int)(WindowStyles.WS_EX_TOOLWINDOW | WindowStyles.WS_EX_TOPMOST);
1515                                         }
1516                                         return cp;
1517                                 }
1518                         }
1519
1520                         #region Private Methods
1521                         // Calcs the listbox area
1522                         internal void CalcListBoxArea ()
1523                         {
1524                                 int width, height;
1525                                 int item_height = owner.ItemHeight;
1526                                 bool show_scrollbar = false;
1527
1528                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1529                                         width = owner.CBoxInfo.listbox_area.Width;
1530                                         height = owner.CBoxInfo.listbox_area.Height;
1531
1532                                         if (owner.IntegralHeight == true) {
1533                                                 int remaining = (height -
1534                                                         ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle) -
1535                                                         ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle)) %
1536                                                         (item_height - 2);
1537
1538                                                 if (remaining > 0) {
1539                                                         height -= remaining;
1540                                                 }
1541                                         }
1542                                 }
1543                                 else { // DropDown or DropDownList
1544
1545                                         width = owner.DropDownWidth;
1546                                         int count = (owner.Items.Count <= owner.MaxDropDownItems) ? owner.Items.Count : owner.MaxDropDownItems;
1547
1548                                         if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1549                                                 height = 0;
1550                                                 for (int i = 0; i < count; i++) {
1551                                                         height += owner.GetItemHeight (i);
1552                                                 }
1553
1554                                         } else  {
1555                                                 height = (item_height - 2) * count;
1556                                         }
1557
1558
1559                                         height += ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle);
1560                                         height += ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1561                                 }
1562
1563                                 if (owner.Items.Count <= owner.MaxDropDownItems) {
1564
1565                                         /* Does not need vertical scrollbar*/
1566                                         if (vscrollbar_ctrl != null) {
1567                                                 vscrollbar_ctrl.Visible = false;
1568                                         }
1569                                 }
1570                                 else {
1571                                         /* Need vertical scrollbar */
1572                                         if (vscrollbar_ctrl == null) {
1573                                                 vscrollbar_ctrl = new VScrollBarLB ();
1574                                                 vscrollbar_ctrl.Minimum = 0;
1575                                                 vscrollbar_ctrl.SmallChange = 1;
1576                                                 vscrollbar_ctrl.LargeChange = 1;
1577                                                 vscrollbar_ctrl.Maximum = 0;
1578                                                 vscrollbar_ctrl.ValueChanged += new EventHandler (VerticalScrollEvent);
1579
1580                                                 Controls.AddImplicit (vscrollbar_ctrl);
1581                                         }
1582
1583                                         vscrollbar_ctrl.Height = height - ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle) -
1584                                                         ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1585
1586                                         vscrollbar_ctrl.Location = new Point (width - vscrollbar_ctrl.Width - ThemeEngine.Current.DrawComboListBoxDecorationRight (owner.DropDownStyle),
1587                                                         ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle));
1588
1589                                         vscrollbar_ctrl.Maximum = owner.Items.Count - (owner.DropDownStyle == ComboBoxStyle.Simple ? page_size : owner.maxdrop_items);
1590                                         show_scrollbar = vscrollbar_ctrl.Visible = true;
1591                                 }
1592
1593                                 Size = new Size (width, height);
1594                                 textarea_drawable = ClientRectangle;
1595                                 textarea_drawable.Width = width;
1596                                 textarea_drawable.Height = height;
1597
1598                                 // Exclude decorations
1599                                 textarea_drawable.X += ThemeEngine.Current.DrawComboListBoxDecorationLeft (owner.DropDownStyle);
1600                                 textarea_drawable.Y += ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1601                                 textarea_drawable.Width -= ThemeEngine.Current.DrawComboListBoxDecorationRight (owner.DropDownStyle);
1602                                 textarea_drawable.Width -= ThemeEngine.Current.DrawComboListBoxDecorationLeft (owner.DropDownStyle);
1603                                 textarea_drawable.Height -= ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle);
1604                                 textarea_drawable.Height -= ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1605
1606                                 if (vscrollbar_ctrl != null && show_scrollbar)
1607                                         textarea_drawable.Width -= vscrollbar_ctrl.Width;
1608
1609                                 last_item = LastVisibleItem ();
1610                                 page_size = textarea_drawable.Height / (item_height - 2);
1611                         }
1612
1613                         private void Draw (Rectangle clip, Graphics dc)
1614                         {
1615                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush
1616                                         (owner.BackColor), clip);
1617
1618                                 if (owner.Items.Count > 0) {
1619                                         Rectangle item_rect;
1620                                         DrawItemState state = DrawItemState.None;
1621
1622                                         for (int i = top_item; i <= last_item; i++) {
1623                                                 item_rect = GetItemDisplayRectangle (i, top_item);
1624
1625                                                 if (clip.IntersectsWith (item_rect) == false)
1626                                                         continue;
1627
1628                                                 /* Draw item */
1629                                                 state = DrawItemState.None;
1630
1631                                                 if (i == GetHighLightedIndex () ) {
1632                                                         state |= DrawItemState.Selected;
1633
1634                                                         if (owner.DropDownStyle == ComboBoxStyle.DropDownList) {
1635                                                                 state |= DrawItemState.Focus;
1636                                                         }
1637                                                 }
1638
1639                                                 owner.OnDrawItem (new DrawItemEventArgs (dc, owner.Font, item_rect,
1640                                                         i, state, owner.ForeColor, owner.BackColor));
1641                                         }
1642                                 }
1643
1644                                 ThemeEngine.Current.DrawComboListBoxDecorations (dc, owner, ClientRectangle);
1645                         }
1646
1647                         public int GetHighLightedIndex ()
1648                         {
1649                                 return owner.Items.IndexOf (highlighted_item);
1650                         }
1651
1652                         public object GetHighLightedItem ()
1653                         {
1654                                 return highlighted_item;
1655                         }
1656
1657                         private Rectangle GetItemDisplayRectangle (int index, int first_displayble)
1658                         {
1659                                 if (index < 0 || index >= owner.Items.Count)
1660                                         throw new  ArgumentOutOfRangeException ("GetItemRectangle index out of range.");
1661
1662                                 Rectangle item_rect = new Rectangle ();
1663                                 int height = owner.GetItemHeight (index);
1664
1665                                 item_rect.X = ThemeEngine.Current.DrawComboListBoxDecorationRight (owner.DropDownStyle);
1666                                 item_rect.Width = textarea_drawable.Width;
1667                                 item_rect.Y = ((height - 2) * (index - first_displayble));
1668
1669                                 if (owner.dropdown_style == ComboBoxStyle.Simple)
1670                                         item_rect.Y += 2;
1671
1672                                 item_rect.Height = height;
1673                                 return item_rect;
1674                         }
1675
1676                         public void HideWindow ()
1677                         {
1678                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1679                                         return;
1680
1681                                 Capture = false;
1682                                 Hide ();
1683                                 highlighted_item = -1;
1684                                 owner.DropDownListBoxFinished ();
1685                         }
1686
1687                         private int IndexFromPointDisplayRectangle (int x, int y)
1688                         {
1689                                 for (int i = top_item; i <= last_item; i++) {
1690                                         if (GetItemDisplayRectangle (i, top_item).Contains (x, y) == true)
1691                                                 return i;
1692                                 }
1693
1694                                 return -1;
1695                         }
1696
1697                         protected override bool IsInputKey (Keys keyData)
1698                         {
1699                                 return owner.IsInputKey (keyData);
1700                         }
1701
1702                         private int LastVisibleItem ()
1703                         {
1704                                 Rectangle item_rect;
1705                                 int top_y = textarea_drawable.Y + textarea_drawable.Height;
1706                                 int i = 0;
1707
1708                                 for (i = top_item; i < owner.Items.Count; i++) {
1709                                         item_rect = GetItemDisplayRectangle (i, top_item);
1710                                         if (item_rect.Y + item_rect.Height > top_y) {
1711                                                 return i;
1712                                         }
1713                                 }
1714                                 return i - 1;
1715                         }
1716
1717                         private void NavigateItemVisually (ItemNavigation navigation)
1718                         {
1719                                 int item = -1;
1720
1721                                 switch (navigation) {
1722                                 case ItemNavigation.Next: {
1723                                         if (GetHighLightedIndex () + 1 < owner.Items.Count) {
1724
1725                                                 if (GetHighLightedIndex () + 1 > last_item) {
1726                                                         top_item++;
1727                                                         vscrollbar_ctrl.Value = top_item;
1728                                                 }
1729                                                 item = GetHighLightedIndex () + 1;
1730                                         }
1731                                         break;
1732                                 }
1733
1734                                 case ItemNavigation.Previous: {
1735                                         if (GetHighLightedIndex () > 0) {
1736
1737                                                 if (GetHighLightedIndex () - 1 < top_item) {
1738                                                         top_item--;
1739                                                         vscrollbar_ctrl.Value = top_item;
1740                                                 }
1741                                                 item = GetHighLightedIndex () - 1;
1742                                         }
1743                                         break;
1744                                 }
1745
1746                                 case ItemNavigation.NextPage: {
1747                                         if (GetHighLightedIndex () + page_size - 1 >= owner.Items.Count) {
1748                                                 top_item = owner.Items.Count - page_size;
1749                                                 vscrollbar_ctrl.Value = top_item;
1750                                                 item = owner.Items.Count - 1;
1751                                         }
1752                                         else {
1753                                                 if (GetHighLightedIndex () + page_size - 1  > last_item) {
1754                                                         top_item = GetHighLightedIndex ();
1755                                                         vscrollbar_ctrl.Value = GetHighLightedIndex ();
1756                                                 }
1757
1758                                                 item = GetHighLightedIndex () + page_size - 1;
1759                                         }
1760                                         break;
1761                                 }
1762
1763                                 case ItemNavigation.PreviousPage: {
1764
1765                                         /* Go to the first item*/
1766                                         if (GetHighLightedIndex () - (page_size - 1) <= 0) {
1767
1768                                                 top_item = 0;
1769                                                 vscrollbar_ctrl.Value = top_item;
1770                                                 item = 0;
1771                                         }
1772                                         else { /* One page back */
1773                                                 if (GetHighLightedIndex () - (page_size - 1)  < top_item) {
1774                                                         top_item = GetHighLightedIndex () - (page_size - 1);
1775                                                         vscrollbar_ctrl.Value = top_item;
1776                                                 }
1777
1778                                                 item = GetHighLightedIndex () - (page_size - 1);
1779                                         }
1780
1781                                         break;
1782                                 }
1783
1784                                 default:
1785                                         break;
1786                                 }
1787
1788                                 if (item != -1) {
1789                                         SetHighLightedItem (owner.Items[item]);
1790
1791                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1792
1793                                         if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1794                                                 owner.SetControlText (owner.GetItemText (owner.Items[item]));
1795                                         }
1796                                 }
1797                         }
1798
1799                         private void OnKeyDownPUW (object sender, KeyEventArgs e)
1800                         {
1801                                 switch (e.KeyCode) {
1802                                 case Keys.Up:
1803                                         NavigateItemVisually (ItemNavigation.Previous);
1804                                         break;
1805
1806                                 case Keys.Down:
1807                                         NavigateItemVisually (ItemNavigation.Next);
1808                                         break;
1809
1810                                 case Keys.PageUp:
1811                                         NavigateItemVisually (ItemNavigation.PreviousPage);
1812                                         break;
1813
1814                                 case Keys.PageDown:
1815                                         NavigateItemVisually (ItemNavigation.NextPage);
1816                                         break;
1817
1818                                 default:
1819                                         break;
1820                                 }
1821                         }
1822
1823                         public void SetHighLightedItem (object item)
1824                         {
1825                                 Rectangle invalidate;
1826
1827                                 if (GetHighLightedItem () == item)
1828                                         return;
1829
1830                                 /* Previous item */
1831                                 if (GetHighLightedIndex () != -1) {
1832                                         invalidate = GetItemDisplayRectangle (GetHighLightedIndex (), top_item);
1833                                         if (ClientRectangle.IntersectsWith (invalidate))
1834                                                 Invalidate (invalidate);
1835                                 }
1836
1837                                 highlighted_item = item;
1838
1839                                 if (highlighted_item != null) {
1840                                          /* Current item */
1841                                         invalidate = GetItemDisplayRectangle (GetHighLightedIndex (), top_item);
1842                                         if (ClientRectangle.IntersectsWith (invalidate))
1843                                                 Invalidate (invalidate);
1844                                 }
1845
1846                         }
1847
1848                         public void SetTopItem (int item)
1849                         {
1850                                 top_item = item;
1851                                 UpdateLastVisibleItem ();
1852                                 Refresh ();
1853                         }
1854
1855                         private void OnMouseDownPUW (object sender, MouseEventArgs e)
1856                         {
1857                                 Rectangle scrollbar_screenrect;
1858                                 Point mouse_screen, scrollbar_screen;
1859                                 mouse_screen = PointToScreen (new Point (e.X, e.Y));
1860
1861                                 /* Click on an element ? */
1862                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1863                                 if (index != -1) {
1864                                         owner.SelectedIndex = index;
1865                                         SetHighLightedItem (owner.Items[index]);
1866                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1867                                         HideWindow ();
1868                                         return;
1869                                 }
1870
1871                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1872                                         return;
1873
1874                                 /* Reroute event to scrollbar */
1875                                 if (vscrollbar_ctrl != null && vscrollbar_ctrl.Visible == true) {
1876                                         scrollbar_screenrect = vscrollbar_ctrl.ClientRectangle;
1877                                         scrollbar_screen = PointToScreen (vscrollbar_ctrl.Location);
1878                                         scrollbar_screenrect.X = scrollbar_screen.X;
1879                                         scrollbar_screenrect.Y = scrollbar_screen.Y;
1880
1881                                         if (scrollbar_screenrect.Contains (mouse_screen)){
1882                                                 Point pnt_client = vscrollbar_ctrl.PointToClient (mouse_screen);
1883                                                 vscrollbar_ctrl.FireMouseDown (new MouseEventArgs (e.Button, e.Clicks,
1884                                                         pnt_client.X, pnt_client.Y, e.Delta));
1885                                         } else  { /* Click in a non-client area*/
1886                                                 HideWindow ();
1887                                         }
1888                                 } else  { /* Click in a non-client area*/
1889                                         HideWindow ();
1890                                 }
1891                         }
1892
1893                         private void OnMouseMovePUW (object sender, MouseEventArgs e)
1894                         {
1895                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1896                                         return;
1897
1898                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1899
1900                                 if (index != -1) {
1901                                         SetHighLightedItem (owner.Items[index]);
1902                                         return;
1903                                 }
1904
1905                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1906                                         return;
1907
1908                                 /* Reroute event to scrollbar */
1909                                 if (vscrollbar_ctrl != null && vscrollbar_ctrl.Visible == true) {
1910                                         Rectangle scrollbar_screenrect;
1911                                         Point mouse_screen, scrollbar_screen;
1912                                         mouse_screen = PointToScreen (new Point (e.X, e.Y));
1913
1914                                         scrollbar_screenrect = vscrollbar_ctrl.ClientRectangle;
1915                                         scrollbar_screen = PointToScreen (vscrollbar_ctrl.Location);
1916                                         scrollbar_screenrect.X = scrollbar_screen.X;
1917                                         scrollbar_screenrect.Y = scrollbar_screen.Y;
1918
1919                                         if (scrollbar_screenrect.Contains (mouse_screen)){
1920                                                 Point pnt_client = vscrollbar_ctrl.PointToClient (mouse_screen);
1921
1922                                                 vscrollbar_ctrl.FireMouseMove (new MouseEventArgs (e.Button, e.Clicks,
1923                                                         pnt_client.X, pnt_client.Y, e.Delta));
1924                                         }
1925                                 }
1926                         }
1927
1928                         private void OnMouseUpPUW (object sender, MouseEventArgs e)
1929                         {
1930                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1931                                         return;
1932
1933                                 /* Reroute event to scrollbar */
1934                                 Rectangle scrollbar_screenrect;
1935                                 Point mouse_screen, scrollbar_screen;
1936                                 mouse_screen = PointToScreen (new Point (e.X, e.Y));
1937
1938                                 if (vscrollbar_ctrl != null && vscrollbar_ctrl.Visible == true) {
1939                                         scrollbar_screenrect = vscrollbar_ctrl.ClientRectangle;
1940                                         scrollbar_screen = PointToScreen (vscrollbar_ctrl.Location);
1941                                         scrollbar_screenrect.X = scrollbar_screen.X;
1942                                         scrollbar_screenrect.Y = scrollbar_screen.Y;
1943
1944                                         if (scrollbar_screenrect.Contains (mouse_screen)){
1945                                                 Point pnt_client = vscrollbar_ctrl.PointToClient (mouse_screen);
1946
1947                                                 vscrollbar_ctrl.FireMouseUp (new MouseEventArgs (e.Button, e.Clicks,
1948                                                         pnt_client.X, pnt_client.Y, e.Delta));
1949                                         }
1950                                 }
1951                         }
1952
1953                         private void OnPaintPUW (Object o, PaintEventArgs pevent)
1954                         {
1955                                 Draw (pevent.ClipRectangle,pevent.Graphics);
1956                         }
1957
1958                         public bool ShowWindow ()
1959                         {
1960                                 if (owner.DropDownStyle != ComboBoxStyle.Simple && owner.Items.Count == 0)
1961                                         return false;
1962
1963                                 SetHighLightedItem (owner.SelectedItem);
1964                                 int index = GetHighLightedIndex ();
1965                                 SetTopItem (index == -1 ? 0 : index );
1966
1967                                 CalcListBoxArea ();
1968                                 Show ();
1969
1970                                 if (owner.DropDownStyle != ComboBoxStyle.Simple) {
1971                                         Capture = true;
1972                                 }
1973
1974                                 Refresh ();
1975
1976                                 if (owner.DropDown != null) {
1977                                         owner.DropDown (owner, EventArgs.Empty);
1978                                 }
1979
1980                                 return true;
1981                         }
1982
1983                         public void UpdateLastVisibleItem ()
1984                         {
1985                                 last_item = LastVisibleItem ();
1986                         }
1987
1988                         // Value Changed
1989                         private void VerticalScrollEvent (object sender, EventArgs e)
1990                         {
1991                                 top_item =  vscrollbar_ctrl.Value;
1992                                 UpdateLastVisibleItem ();
1993                                 Refresh ();
1994                         }
1995
1996                         #endregion Private Methods
1997                 }
1998         }
1999 }
2000