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