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 {\r
  78                                 get {\r
  79                                         return base.Name;\r
  80                                 }\r
  81                         }\r
  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
  98                         public ComboBoxInfo ()
  99                         {
 100                                 button_status = ButtonState.Normal;
 101                                 show_button = false;
 102                                 item_height = 0;
 103                                 droppeddown = false;
 104                                 original_height = -1;
 105                         }
 106                 }
 107
 108                 internal class ComboBoxItem
 109                 {
 110                         internal int Index;
 111                         internal int ItemHeight;                /* Only used for OwnerDrawVariable */
 112
 113                         public ComboBoxItem (int index)
 114                         {
 115                                 Index = index;
 116                                 ItemHeight = -1;
 117                         }
 118                 }
 119
 120                 public ComboBox ()
 121                 {
 122                         items = new ObjectCollection (this);
 123                         listbox_ctrl = null;
 124                         textbox_ctrl = null;
 125                         combobox_info = new ComboBoxInfo ();
 126                         combobox_info.item_height = FontHeight + 2;
 127                         dropdown_style = (ComboBoxStyle)(-1);
 128                         DropDownStyle = ComboBoxStyle.DropDown;
 129                         BackColor = ThemeEngine.Current.ColorWindow;
 130                         draw_mode = DrawMode.Normal;
 131                         selected_index = -1;
 132                         selected_item = null;
 133                         maxdrop_items = 8;
 134                         suspend_ctrlupdate = false;
 135                         clicked = false;
 136                         dropdown_width = -1;
 137                         max_length = 0;
 138                         integral_height = true;
 139                         process_textchanged_event = true;
 140                         has_focus = false;
 141
 142                         /* Events */
 143                         MouseDown += new MouseEventHandler (OnMouseDownCB);
 144                         MouseUp += new MouseEventHandler (OnMouseUpCB);
 145                         MouseMove += new MouseEventHandler (OnMouseMoveCB);
 146                 }
 147
 148                 #region events
 149
 150                 [Browsable (false)]
 151                 [EditorBrowsable (EditorBrowsableState.Never)]
 152                 public new event EventHandler BackgroundImageChanged;
 153
 154                 public event DrawItemEventHandler DrawItem;
 155                 public event EventHandler DropDown;
 156                 public event EventHandler DropDownStyleChanged;
 157                 public event MeasureItemEventHandler MeasureItem;
 158
 159                 [Browsable (false)]
 160                 [EditorBrowsable (EditorBrowsableState.Never)]
 161                 public new event PaintEventHandler Paint;
 162
 163                 public event EventHandler SelectedIndexChanged;
 164                 public event EventHandler SelectionChangeCommitted;
 165                 #endregion Events
 166
 167                 #region Public Properties
 168                 public override Color BackColor {
 169                         get { return base.BackColor; }
 170                         set {
 171                                 if (base.BackColor == value)
 172                                         return;
 173
 174                                 base.BackColor = value;
 175                                 Refresh ();
 176                         }
 177                 }
 178
 179                 [Browsable (false)]
 180                 [EditorBrowsable (EditorBrowsableState.Never)]
 181                 public override Image BackgroundImage {
 182                         get { return base.BackgroundImage; }
 183                         set {
 184                                 if (base.BackgroundImage == value)
 185                                         return;
 186
 187                                 base.BackgroundImage = value;
 188
 189                                 if (BackgroundImageChanged != null)
 190                                         BackgroundImageChanged (this, EventArgs.Empty);
 191
 192                                 Refresh ();
 193                         }
 194                 }
 195
 196                 protected override CreateParams CreateParams {
 197                         get { return base.CreateParams;}
 198                 }
 199
 200                 protected override Size DefaultSize {
 201                         get { return new Size (121, PreferredHeight); }
 202                 }
 203
 204                 [RefreshProperties(RefreshProperties.Repaint)]
 205                 [DefaultValue (DrawMode.Normal)]
 206                 public DrawMode DrawMode {
 207                         get { return draw_mode; }
 208
 209                         set {
 210                                 if (!Enum.IsDefined (typeof (DrawMode), value))
 211                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for DrawMode", value));
 212
 213                                 if (draw_mode == value)
 214                                         return;
 215
 216                                 draw_mode = value;
 217                                 Refresh ();
 218                         }
 219                 }
 220
 221                 [DefaultValue (ComboBoxStyle.DropDown)]
 222                 [RefreshProperties(RefreshProperties.Repaint)]
 223                 public ComboBoxStyle DropDownStyle {
 224                         get { return dropdown_style; }
 225
 226                         set {
 227
 228                                 if (!Enum.IsDefined (typeof (ComboBoxStyle), value))
 229                                         throw new InvalidEnumArgumentException (string.Format("Enum argument value '{0}' is not valid for ComboBoxStyle", value));
 230
 231                                 if (dropdown_style == value)
 232                                         return;
 233
 234                                 if (dropdown_style == ComboBoxStyle.Simple) {
 235                                         if (listbox_ctrl != null) {
 236                                                 Controls.Remove (listbox_ctrl);
 237                                                 listbox_ctrl.Dispose ();
 238                                                 listbox_ctrl = null;
 239                                         }
 240                                 }
 241
 242                                 if (dropdown_style != ComboBoxStyle.DropDownList && value == ComboBoxStyle.DropDownList) {
 243                                         if (textbox_ctrl != null) {
 244                                                 Controls.Remove (textbox_ctrl);
 245                                                 textbox_ctrl.Dispose ();
 246                                                 textbox_ctrl = null;
 247                                         }
 248                                 }
 249
 250                                 dropdown_style = value;
 251
 252                                 if (dropdown_style == ComboBoxStyle.Simple) {
 253                                         CBoxInfo.show_button = false;
 254
 255                                         if (combobox_info.original_height != -1)
 256                                                 Height = combobox_info.original_height;
 257
 258                                         CreateComboListBox ();
 259
 260                                         if (IsHandleCreated == true) {
 261                                                 Controls.Add (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.Add (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 ArgumentOutOfRangeException ("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.Remove (listbox_ctrl);
 603                                         listbox_ctrl = null;
 604                                 }
 605
 606                                 if (textbox_ctrl != null) {
 607                                         Controls.Remove (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, 0);
 625                 }
 626
 627                 public int FindString (string s, int startIndex)
 628                 {
 629                         for (int i = startIndex; i < Items.Count; i++) {
 630                                 if ((GetItemText (Items[i])).StartsWith (s))
 631                                         return i;
 632                         }
 633
 634                         return -1;
 635                 }
 636
 637                 public int FindStringExact (string s)
 638                 {
 639                         return FindStringExact (s, 0);
 640                 }
 641
 642                 public int FindStringExact (string s, int startIndex)
 643                 {
 644                         for (int i = startIndex; i < Items.Count; i++) {
 645                                 if ((GetItemText (Items[i])).Equals (s))
 646                                         return i;
 647                         }
 648
 649                         return -1;
 650                 }
 651
 652                 public int GetItemHeight (int index)
 653                 {
 654                         if (index < 0 || index >= Items.Count )
 655                                 throw new ArgumentOutOfRangeException ("The item height value is less than zero");
 656
 657                         if (DrawMode == DrawMode.OwnerDrawVariable && IsHandleCreated == true) {
 658
 659                                 if ((Items.GetComboBoxItem (index)).ItemHeight != -1) {
 660                                         return (Items.GetComboBoxItem (index)).ItemHeight;
 661                                 }
 662
 663                                 MeasureItemEventArgs args = new MeasureItemEventArgs (DeviceContext, index, ItemHeight);
 664                                 OnMeasureItem (args);
 665                                 (Items.GetComboBoxItem (index)).ItemHeight = args.ItemHeight;
 666                                 return args.ItemHeight;
 667                         }
 668
 669                         return ItemHeight;
 670                 }
 671
 672                 protected override bool IsInputKey (Keys keyData)
 673                 {
 674                         switch (keyData) {
 675                         case Keys.Up:
 676                         case Keys.Down:
 677                         case Keys.PageUp:
 678                         case Keys.PageDown:
 679                                 return true;
 680
 681                         default:
 682                                 return false;
 683                         }
 684                 }
 685
 686                 protected override void OnBackColorChanged (EventArgs e)
 687                 {
 688                         base.OnBackColorChanged (e);
 689                 }
 690
 691                 protected override void OnDataSourceChanged (EventArgs e)
 692                 {
 693                         base.OnDataSourceChanged (e);
 694                         BindDataItems (items);
 695
 696                         if (DataSource == null || DataManager == null) {
 697                                 SelectedIndex = -1;
 698                         }
 699                         else {
 700                                 SelectedIndex = DataManager.Position;
 701                         }
 702                 }
 703
 704                 protected override void OnDisplayMemberChanged (EventArgs e)
 705                 {
 706                         base.OnDisplayMemberChanged (e);
 707
 708                         if (DataManager == null || !IsHandleCreated)
 709                                return;
 710
 711                         BindDataItems (items);
 712                         SelectedIndex = DataManager.Position;
 713                 }
 714
 715                 protected virtual void OnDrawItem (DrawItemEventArgs e)
 716                 {
 717                         if (DrawItem != null && (DrawMode == DrawMode.OwnerDrawFixed || DrawMode == DrawMode.OwnerDrawVariable)) {
 718                                 DrawItem (this, e);
 719                                 return;
 720                         }
 721
 722                         ThemeEngine.Current.DrawComboBoxItem (this, e);
 723                 }
 724
 725                 protected virtual void OnDropDown (EventArgs e)
 726                 {
 727                         if (DropDown != null)
 728                                 DropDown (this, e);
 729                 }
 730
 731                 protected virtual void OnDropDownStyleChanged (EventArgs e)
 732                 {
 733                         if (DropDownStyleChanged != null)
 734                                 DropDownStyleChanged (this, e);
 735                 }
 736
 737                 protected override void OnFontChanged (EventArgs e)
 738                 {
 739                         base.OnFontChanged (e);
 740
 741                         if (textbox_ctrl != null) {
 742                                 textbox_ctrl.Font = Font;
 743                         }
 744
 745                         combobox_info.item_height = FontHeight + 2;
 746                         CalcTextArea ();
 747                 }
 748
 749                 protected override void OnForeColorChanged (EventArgs e)
 750                 {
 751                         base.OnForeColorChanged (e);
 752                 }
 753
 754                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 755                 protected override void OnGotFocus (EventArgs e) {
 756                         has_focus = true;
 757                         Invalidate ();
 758                 }
 759
 760                 [EditorBrowsable(EditorBrowsableState.Advanced)]
 761                 protected override void OnLostFocus (EventArgs e) {
 762                         has_focus = false;
 763                         Invalidate ();
 764                 }
 765
 766                 protected override void OnHandleCreated (EventArgs e)
 767                 {
 768                         base.OnHandleCreated (e);
 769
 770                         if (listbox_ctrl != null) {
 771                                 Controls.Add (listbox_ctrl);
 772                         }
 773
 774                         if (textbox_ctrl != null) {
 775                                 Controls.Add (textbox_ctrl);
 776                         }
 777
 778                         CalcTextArea ();
 779                 }
 780
 781                 protected override void OnHandleDestroyed (EventArgs e)
 782                 {
 783                         base.OnHandleDestroyed (e);
 784                 }
 785
 786                 protected override void OnKeyPress (KeyPressEventArgs e)
 787                 {
 788                         base.OnKeyPress (e);
 789                 }
 790
 791                 protected virtual void OnMeasureItem (MeasureItemEventArgs e)
 792                 {
 793                         if (MeasureItem != null)
 794                                 MeasureItem (this, e);
 795                 }
 796
 797                 protected override void OnParentBackColorChanged (EventArgs e)
 798                 {
 799                         base.OnParentBackColorChanged (e);
 800                 }
 801
 802                 protected override void OnResize (EventArgs e)
 803                 {
 804                         base.OnResize (e);
 805                         AdjustHeightForDropDown ();
 806                         CalcTextArea ();
 807                 }
 808
 809                 protected override void OnSelectedIndexChanged (EventArgs e)
 810                 {
 811                         base.OnSelectedIndexChanged (e);
 812
 813                         if (SelectedIndexChanged != null)
 814                                 SelectedIndexChanged (this, e);
 815                 }
 816
 817                 protected virtual void OnSelectedItemChanged (EventArgs e)
 818                 {
 819
 820                 }
 821
 822                 protected override void OnSelectedValueChanged (EventArgs e)
 823                 {
 824                         base.OnSelectedValueChanged (e);
 825                 }
 826
 827                 protected virtual void OnSelectionChangeCommitted (EventArgs e)
 828                 {
 829                         if (SelectionChangeCommitted != null)
 830                                 SelectionChangeCommitted (this, e);
 831                 }
 832
 833                 protected override void RefreshItem (int index)
 834                 {
 835                         if (index < 0 || index >= Items.Count)
 836                                 throw new ArgumentOutOfRangeException ("Index of out range");
 837
 838                         if (draw_mode == DrawMode.OwnerDrawVariable) {
 839                                 (Items.GetComboBoxItem (index)).ItemHeight = -1;
 840                         }
 841                 }
 842
 843                 public void Select (int start, int lenght)
 844                 {
 845                         if (start < 0)
 846                                 throw new ArgumentException ("Start cannot be less than zero");
 847
 848                         if (lenght < 0)
 849                                 throw new ArgumentException ("Start cannot be less than zero");
 850
 851                         if (dropdown_style == ComboBoxStyle.DropDownList)
 852                                 return;
 853
 854                         textbox_ctrl.Select (start, lenght);
 855                 }
 856
 857                 public void SelectAll ()
 858                 {
 859                         if (dropdown_style == ComboBoxStyle.DropDownList)
 860                                 return;
 861
 862                         textbox_ctrl.SelectAll ();
 863                 }
 864
 865                 protected override void SetBoundsCore (int x, int y, int width, int height, BoundsSpecified specified)
 866                 {
 867                         base.SetBoundsCore (x, y, width, height, specified);
 868                 }
 869
 870                 protected override void SetItemCore (int index, object value)
 871                 {
 872                         if (index < 0 || index >= Items.Count)
 873                                 return;
 874
 875                         Items[index] = value;
 876                 }
 877
 878                 protected override void SetItemsCore (IList value)
 879                 {
 880                         Items.AddRange (value);
 881                 }
 882
 883                 public override string ToString ()
 884                 {
 885                         return base.ToString () + ", Items.Count:" + Items.Count;
 886                 }
 887
 888                 protected override void WndProc (ref Message m)
 889                 {
 890
 891                         switch ((Msg) m.Msg) {
 892
 893                         case Msg.WM_PAINT: {
 894                                 PaintEventArgs  paint_event;
 895                                 paint_event = XplatUI.PaintEventStart (Handle);
 896                                 OnPaintCB (paint_event);
 897                                 XplatUI.PaintEventEnd (Handle);
 898                                 return;
 899                         }
 900
 901                         case Msg.WM_ERASEBKGND:
 902                                 m.Result = (IntPtr) 1;
 903                                 return;
 904
 905                         default:
 906                                 break;
 907                         }
 908
 909                         base.WndProc (ref m);
 910
 911                 }
 912
 913                 #endregion Public Methods
 914
 915                 #region Private Methods
 916
 917                 private void AdjustHeightForDropDown ()
 918                 {
 919                         if (dropdown_style == ComboBoxStyle.Simple)
 920                                 return;
 921
 922                         int new_height = combobox_info.item_height + ThemeEngine.Current.DrawComboBoxEditDecorationTop () +
 923                                 ThemeEngine.Current.DrawComboBoxEditDecorationBottom () + 2;
 924
 925                         if (Height == new_height)
 926                                 return;
 927
 928                         combobox_info.original_height = Height;
 929                         Height = new_height;
 930                 }
 931
 932                 private void textbox_ctrl_KeyPress(object sender, KeyPressEventArgs e)
 933                 {\r
 934                         OnKeyPress (e);\r
 935                 }\r
 936
 937                 // Calcs the text area size
 938                 internal void CalcTextArea ()
 939                 {
 940                         combobox_info.textarea = ClientRectangle;
 941
 942                         /* Edit area */
 943                         combobox_info.textarea.Height = ItemHeight + ThemeEngine.Current.DrawComboBoxEditDecorationTop () +
 944                                         ThemeEngine.Current.DrawComboBoxEditDecorationBottom () + 2;
 945                                         // TODO: Does the +2 change at different font resolutions?
 946
 947                         /* Edit area - minus decorations (text drawable area) */
 948                         combobox_info.textarea_drawable = combobox_info.textarea;
 949                         combobox_info.textarea_drawable.Y += ThemeEngine.Current.DrawComboBoxEditDecorationTop ();
 950                         combobox_info.textarea_drawable.X += ThemeEngine.Current.DrawComboBoxEditDecorationLeft ();
 951                         combobox_info.textarea_drawable.Height -= ThemeEngine.Current.DrawComboBoxEditDecorationBottom ();
 952                         combobox_info.textarea_drawable.Height -= ThemeEngine.Current.DrawComboBoxEditDecorationTop();
 953                         combobox_info.textarea_drawable.Width -= ThemeEngine.Current.DrawComboBoxEditDecorationRight ();
 954                         combobox_info.textarea_drawable.Width -= ThemeEngine.Current.DrawComboBoxEditDecorationLeft ();
 955
 956                         /* Non-drawable area */
 957                         Region area = new Region (ClientRectangle);
 958                         area.Exclude (combobox_info.textarea);
 959                         RectangleF bounds = area.GetBounds (DeviceContext);
 960                         combobox_info.listbox_area = new Rectangle ((int)bounds.X, (int)bounds.Y,
 961                                 (int)bounds.Width, (int)bounds.Height);
 962
 963                         if (CBoxInfo.show_button) {
 964                                 combobox_info.textarea_drawable.Width -= def_button_width;
 965
 966                                 combobox_info.button_rect = new Rectangle (combobox_info.textarea_drawable.X + combobox_info.textarea_drawable.Width,
 967                                         combobox_info.textarea_drawable.Y, def_button_width, combobox_info.textarea_drawable.Height);
 968
 969                         }
 970
 971                         if (dropdown_style != ComboBoxStyle.DropDownList) { /* There is an edit control*/
 972                                 if (textbox_ctrl != null) {
 973                                         textbox_ctrl.Location = new Point (combobox_info.textarea_drawable.X, combobox_info.textarea_drawable.Y);
 974                                         textbox_ctrl.Size = new Size (combobox_info.textarea_drawable.Width, combobox_info.textarea_drawable.Height);
 975                                 }
 976                         }
 977
 978                         if (listbox_ctrl != null && dropdown_style == ComboBoxStyle.Simple) {
 979                                 listbox_ctrl.Location = new Point (combobox_info.textarea.X, combobox_info.textarea.Y +
 980                                         combobox_info.textarea.Height);
 981                                 listbox_ctrl.CalcListBoxArea ();
 982                         }
 983
 984                         area.Dispose ();
 985                 }
 986
 987                 private void CreateComboListBox ()
 988                 {
 989                         listbox_ctrl = new ComboListBox (this);
 990                 }
 991
 992                 internal void Draw (Rectangle clip, Graphics dc)
 993                 {
 994                         // No edit control, we paint the edit ourselfs
 995                         if (dropdown_style == ComboBoxStyle.DropDownList) {
 996                                 DrawItemState state = DrawItemState.None;
 997                                 Rectangle item_rect = combobox_info.textarea_drawable;
 998                                 item_rect.Height = ItemHeight + 2;
 999
1000                                 if (has_focus == true) {
1001                                         state = DrawItemState.Selected;
1002                                         state |= DrawItemState.Focus;
1003                                 }
1004
1005                                 OnDrawItem (new DrawItemEventArgs (dc, Font, item_rect,
1006                                                         selected_index, state, ForeColor, BackColor));
1007                         }
1008
1009                         if (clip.IntersectsWith (combobox_info.listbox_area) == true) {
1010                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (Parent.BackColor),
1011                                                 combobox_info.listbox_area);
1012                         }
1013
1014                         if (CBoxInfo.show_button) {
1015                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (ThemeEngine.Current.ColorButtonFace),
1016                                         combobox_info.button_rect);
1017
1018                                 ThemeEngine.Current.CPDrawComboButton (dc,
1019                                         combobox_info.button_rect, combobox_info.button_status);
1020                         }
1021
1022                         ThemeEngine.Current.DrawComboBoxEditDecorations (dc, this, combobox_info.textarea);
1023                 }
1024
1025                 internal void DropDownListBox ()
1026                 {
1027                         if (DropDownStyle == ComboBoxStyle.Simple)
1028                                 return;
1029
1030                         if (listbox_ctrl == null) {
1031                                 CreateComboListBox ();
1032                         }
1033
1034                         listbox_ctrl.Location = PointToScreen (new Point (combobox_info.textarea.X, combobox_info.textarea.Y +
1035                                 combobox_info.textarea.Height));
1036
1037                         if (listbox_ctrl.ShowWindow () == true) {
1038                                 CBoxInfo.droppeddown = true;
1039                         }
1040
1041                         combobox_info.button_status = ButtonState.Pushed;
1042                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1043                                 Invalidate (combobox_info.textarea_drawable);
1044                         }
1045                 }
1046
1047                 internal void DropDownListBoxFinished ()
1048                 {
1049                         if (DropDownStyle == ComboBoxStyle.Simple)
1050                                 return;
1051
1052                         combobox_info.button_status = ButtonState.Normal;
1053                         Invalidate (combobox_info.button_rect);
1054                         CBoxInfo.droppeddown = false;
1055                         clicked = false;
1056                 }
1057
1058                 private int FindStringCaseInsensitive (string search)
1059                 {
1060                         for (int i = 0; i < Items.Count; i++)
1061                         {
1062                                 if (String.Compare (GetItemText (Items[i]), 0, search, 0, search.Length, true) == 0)
1063                                         return i;
1064                         }
1065
1066                         return -1;
1067                 }
1068
1069                 internal virtual void OnMouseDownCB (object sender, MouseEventArgs e)
1070                 {
1071                         /* Click On button*/
1072                         Rectangle hit_rect;
1073
1074                         if (dropdown_style == ComboBoxStyle.DropDownList) {
1075                                 hit_rect = combobox_info.textarea;
1076                         } else {
1077                                 hit_rect = combobox_info.button_rect;
1078                         }
1079
1080                         if (hit_rect.Contains (e.X, e.Y)) {
1081                                 if (clicked == false) {
1082                                         clicked = true;
1083                                         DropDownListBox ();
1084                                 } else {
1085                                         listbox_ctrl.Hide ();
1086                                         DropDownListBoxFinished ();
1087                                 }
1088
1089                                 Invalidate (combobox_info.button_rect);
1090                         }
1091                 }
1092
1093                 internal virtual void OnMouseMoveCB (object sender, MouseEventArgs e)
1094                 {
1095                         /* When there are no items, act as a regular button */
1096                         if (clicked == true && Items.Count == 0 &&
1097                                  combobox_info.button_rect.Contains (e.X, e.Y) == false) {
1098                                 DropDownListBoxFinished ();
1099                         }
1100                 }
1101
1102                 internal virtual void OnMouseUpCB (object sender, MouseEventArgs e)
1103                 {
1104                         /* Click on button*/
1105                         if (clicked == true && combobox_info.button_rect.Contains (e.X, e.Y)) {
1106                                 DropDownListBoxFinished ();
1107                         }
1108                 }
1109
1110                 private void OnPaintCB (PaintEventArgs pevent)
1111                 {
1112                         if (Width <= 0 || Height <=  0 || Visible == false || suspend_ctrlupdate == true)
1113                                 return;
1114
1115                         /* Copies memory drawing buffer to screen*/
1116                         Draw (ClientRectangle, pevent.Graphics);
1117
1118                         if (Paint != null)
1119                                 Paint (this, pevent);
1120                 }
1121
1122                 private void OnTextChangedEdit (object sender, EventArgs e)
1123                 {
1124                         if (process_textchanged_event == false)
1125                                 return;
1126
1127                         int item = FindStringCaseInsensitive (textbox_ctrl.Text);
1128
1129                         if (item == -1)
1130                                 return;
1131
1132                         listbox_ctrl.SetTopItem (item);
1133                         listbox_ctrl.SetHighLightedItem (Items[item]);
1134                 }
1135
1136                 internal void SetControlText (string s)
1137                 {
1138                         process_textchanged_event = false;
1139                         textbox_ctrl.Text = s;
1140                         process_textchanged_event = true;
1141                 }
1142
1143                 private void UpdatedItems ()
1144                 {
1145                         if (dropdown_style != ComboBoxStyle.Simple)
1146                                 return;
1147
1148                         listbox_ctrl.UpdateLastVisibleItem ();
1149                         listbox_ctrl.CalcListBoxArea ();
1150                         listbox_ctrl.Refresh ();
1151                 }
1152
1153                 #endregion Private Methods
1154
1155
1156                 /*
1157                         ComboBox.ObjectCollection
1158                 */
1159                 [ListBindableAttribute (false)]
1160                 public class ObjectCollection : IList, ICollection, IEnumerable
1161                 {
1162
1163                         private ComboBox owner;
1164                         internal ArrayList object_items = new ArrayList ();
1165                         internal ArrayList combobox_items = new ArrayList ();
1166
1167                         public ObjectCollection (ComboBox owner)
1168                         {
1169                                 this.owner = owner;
1170                         }
1171
1172                         #region Public Properties
1173                         public virtual int Count {
1174                                 get { return object_items.Count; }
1175                         }
1176
1177                         public virtual bool IsReadOnly {
1178                                 get { return false; }
1179                         }
1180
1181                         [Browsable (false)]
1182                         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
1183                         public virtual object this [int index] {
1184                                 get {
1185                                         if (index < 0 || index >= Count)
1186                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1187
1188                                         return object_items[index];
1189                                 }
1190                                 set {
1191                                         if (index < 0 || index >= Count)
1192                                                 throw new ArgumentOutOfRangeException ("Index of out range");
1193
1194                                         object_items[index] = value;
1195                                 }
1196                         }
1197
1198                         bool ICollection.IsSynchronized {
1199                                 get { return false; }
1200                         }
1201
1202                         object ICollection.SyncRoot {
1203                                 get { return this; }
1204                         }
1205
1206                         bool IList.IsFixedSize {
1207                                 get { return false; }
1208                         }
1209
1210                         #endregion Public Properties
1211
1212                         #region Private Properties
1213                         internal ArrayList ObjectItems {
1214                                 get { return object_items;}
1215                                 set {
1216                                         object_items = value;
1217                                 }
1218                         }
1219
1220                         internal ArrayList ListBoxItems {
1221                                 get { return combobox_items;}
1222                                 set {
1223                                         combobox_items = value;
1224                                 }
1225                         }
1226                         #endregion Private Properties
1227
1228                         #region Public Methods
1229                         public int Add (object item)
1230                         {
1231                                 int idx;
1232
1233                                 idx = AddItem (item);
1234                                 owner.UpdatedItems ();
1235                                 return idx;
1236                         }
1237
1238                         public void AddRange (object[] items)
1239                         {
1240                                 foreach (object mi in items)
1241                                         AddItem (mi);
1242
1243                                 owner.UpdatedItems ();
1244                         }
1245
1246                         public virtual void Clear ()
1247                         {
1248                                 owner.selected_index = -1;
1249                                 object_items.Clear ();
1250                                 combobox_items.Clear ();
1251                                 owner.UpdatedItems ();
1252                                 owner.Refresh ();
1253                         }
1254
1255                         public virtual bool Contains (object obj)
1256                         {
1257                                 return object_items.Contains (obj);
1258                         }
1259
1260                         public void CopyTo (object[] dest, int arrayIndex)
1261                         {
1262                                 object_items.CopyTo (dest, arrayIndex);
1263                         }
1264
1265                         void ICollection.CopyTo (Array dest, int index)
1266                         {
1267                                 object_items.CopyTo (dest, index);
1268                         }
1269
1270                         public virtual IEnumerator GetEnumerator ()
1271                         {
1272                                 return object_items.GetEnumerator ();
1273                         }
1274
1275                         int IList.Add (object item)
1276                         {
1277                                 return Add (item);
1278                         }
1279
1280                         public virtual int IndexOf (object value)
1281                         {
1282                                 return object_items.IndexOf (value);
1283                         }
1284
1285                         public virtual void Insert (int index,  object item)
1286                         {
1287                                 if (index < 0 || index > Count)
1288                                         throw new ArgumentOutOfRangeException ("Index of out range");
1289
1290                                 ObjectCollection new_items = new ObjectCollection (owner);
1291                                 object sel_item = owner.SelectedItem;
1292
1293                                 owner.BeginUpdate ();
1294
1295                                 for (int i = 0; i < index; i++) {
1296                                         new_items.AddItem (ObjectItems[i]);
1297                                 }
1298
1299                                 new_items.AddItem (item);
1300
1301                                 for (int i = index; i < Count; i++){
1302                                         new_items.AddItem (ObjectItems[i]);
1303                                 }
1304
1305                                 ObjectItems = new_items.ObjectItems;
1306                                 ListBoxItems = new_items.ListBoxItems;
1307
1308                                 if (sel_item != null) {
1309                                         int idx = IndexOf (sel_item);
1310                                         owner.selected_index = idx;
1311                                         owner.listbox_ctrl.SetHighLightedItem (owner.Items[idx]);
1312                                 }
1313
1314                                 owner.EndUpdate ();     // Calls UpdatedItems
1315                         }
1316
1317                         public virtual void Remove (object value)
1318                         {
1319                                 if (IndexOf (value) == owner.SelectedIndex)
1320                                         owner.SelectedItem = null;
1321
1322                                 RemoveAt (IndexOf (value));
1323
1324                         }
1325
1326                         public virtual void RemoveAt (int index)
1327                         {
1328                                 if (index < 0 || index >= Count)
1329                                         throw new ArgumentOutOfRangeException ("Index of out range");
1330
1331                                 if (index == owner.SelectedIndex)
1332                                         owner.SelectedItem = null;
1333
1334                                 object_items.RemoveAt (index);
1335                                 combobox_items.RemoveAt (index);
1336                                 owner.UpdatedItems ();
1337                         }
1338                         #endregion Public Methods
1339
1340                         #region Private Methods
1341                         private int AddItem (object item)
1342                         {
1343                                 int cnt = object_items.Count;
1344                                 object_items.Add (item);
1345                                 combobox_items.Add (new ComboBox.ComboBoxItem (cnt));
1346                                 return cnt;
1347                         }
1348
1349                         internal void AddRange (IList items)
1350                         {
1351                                 foreach (object mi in items)
1352                                         AddItem (mi);
1353
1354                                 owner.UpdatedItems ();
1355                         }
1356
1357                         internal ComboBox.ComboBoxItem GetComboBoxItem (int index)
1358                         {
1359                                 if (index < 0 || index >= Count)
1360                                         throw new ArgumentOutOfRangeException ("Index of out range");
1361
1362                                 return (ComboBox.ComboBoxItem) combobox_items[index];
1363                         }
1364
1365                         internal void SetComboBoxItem (ComboBox.ComboBoxItem item, int index)
1366                         {
1367                                 if (index < 0 || index >= Count)
1368                                         throw new ArgumentOutOfRangeException ("Index of out range");
1369
1370                                 combobox_items[index] = item;
1371                         }
1372
1373                         #endregion Private Methods
1374                 }
1375
1376                 /*
1377                         class ComboListBox
1378                 */
1379                 internal class ComboListBox : Control
1380                 {
1381                         private ComboBox owner;
1382                         private VScrollBarLB vscrollbar_ctrl;
1383                         private int top_item;                   /* First item that we show the in the current page */
1384                         private int last_item;                  /* Last visible item */
1385                         public object highlighted_item; /* Item that is currently selected */
1386                         internal int page_size;                 /* Number of listbox items per page */
1387                         private Rectangle textarea_drawable;    /* Rectangle of the drawable text area */
1388
1389                         internal enum ItemNavigation
1390                         {
1391                                 First,
1392                                 Last,
1393                                 Next,
1394                                 Previous,
1395                                 NextPage,
1396                                 PreviousPage,
1397                         }
1398
1399                         class VScrollBarLB : VScrollBar
1400                         {
1401                                 public VScrollBarLB ()
1402                                 {
1403                                 }
1404
1405                                 public void FireMouseDown (MouseEventArgs e)
1406                                 {
1407                                         OnMouseDown (e);
1408                                 }
1409
1410                                 public void FireMouseUp (MouseEventArgs e)
1411                                 {
1412                                         OnMouseUp (e);
1413                                 }
1414
1415                                 public void FireMouseMove (MouseEventArgs e)
1416                                 {
1417                                         OnMouseMove (e);
1418                                 }
1419
1420                         }
1421
1422                         public ComboListBox (ComboBox owner) : base ()
1423                         {
1424                                 this.owner = owner;
1425                                 top_item = 0;
1426                                 last_item = 0;
1427                                 page_size = 0;
1428                                 highlighted_item = null;
1429
1430                                 MouseDown += new MouseEventHandler (OnMouseDownPUW);
1431                                 MouseUp += new MouseEventHandler (OnMouseUpPUW);
1432                                 MouseMove += new MouseEventHandler (OnMouseMovePUW);
1433                                 KeyDown += new KeyEventHandler (OnKeyDownPUW);
1434                                 Paint += new PaintEventHandler (OnPaintPUW);
1435                                 SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
1436                                 SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
1437                         }
1438
1439                         protected override CreateParams CreateParams
1440                         {
1441                                 get {
1442                                         CreateParams cp = base.CreateParams;
1443                                         if (owner != null && owner.DropDownStyle != ComboBoxStyle.Simple) {
1444                                                 cp.Style = unchecked ((int)(WindowStyles.WS_POPUP | WindowStyles.WS_VISIBLE | WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN));
1445                                                 cp.ExStyle |= (int)(WindowStyles.WS_EX_TOOLWINDOW | WindowStyles.WS_EX_TOPMOST);
1446                                         }
1447                                         return cp;
1448                                 }
1449                         }
1450
1451                         #region Private Methods
1452                         // Calcs the listbox area
1453                         internal void CalcListBoxArea ()
1454                         {
1455                                 int width, height;
1456                                 int item_height = owner.ItemHeight;
1457                                 bool show_scrollbar = false;
1458
1459                                 if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1460                                         width = owner.CBoxInfo.listbox_area.Width;
1461                                         height = owner.CBoxInfo.listbox_area.Height;
1462
1463                                         if (owner.IntegralHeight == true) {
1464                                                 int remaining = (height -
1465                                                         ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle) -
1466                                                         ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle)) %
1467                                                         (item_height - 2);
1468
1469                                                 if (remaining > 0) {
1470                                                         height -= remaining;
1471                                                 }
1472                                         }
1473                                 }
1474                                 else { // DropDown or DropDownList
1475
1476                                         width = owner.DropDownWidth;
1477                                         int count = (owner.Items.Count <= owner.MaxDropDownItems) ? owner.Items.Count : owner.MaxDropDownItems;
1478
1479                                         if (owner.DrawMode == DrawMode.OwnerDrawVariable) {
1480                                                 height = 0;
1481                                                 for (int i = 0; i < count; i++) {
1482                                                         height += owner.GetItemHeight (i);
1483                                                 }
1484
1485                                         } else  {
1486                                                 height = (item_height - 2) * count;
1487                                         }
1488
1489
1490                                         height += ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle);
1491                                         height += ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1492                                 }
1493
1494                                 if (owner.Items.Count <= owner.MaxDropDownItems) {
1495
1496                                         /* Does not need vertical scrollbar*/
1497                                         if (vscrollbar_ctrl != null) {
1498                                                 vscrollbar_ctrl.Visible = false;
1499                                         }
1500                                 }
1501                                 else {
1502                                         /* Need vertical scrollbar */
1503                                         if (vscrollbar_ctrl == null) {
1504                                                 vscrollbar_ctrl = new VScrollBarLB ();
1505                                                 vscrollbar_ctrl.Minimum = 0;
1506                                                 vscrollbar_ctrl.SmallChange = 1;
1507                                                 vscrollbar_ctrl.LargeChange = 1;
1508                                                 vscrollbar_ctrl.Maximum = 0;
1509                                                 vscrollbar_ctrl.ValueChanged += new EventHandler (VerticalScrollEvent);
1510
1511                                                 Controls.Add (vscrollbar_ctrl);
1512                                         }
1513
1514                                         vscrollbar_ctrl.Height = height - ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle) -
1515                                                         ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1516
1517                                         vscrollbar_ctrl.Location = new Point (width - vscrollbar_ctrl.Width - ThemeEngine.Current.DrawComboListBoxDecorationRight (owner.DropDownStyle),
1518                                                         ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle));
1519
1520                                         vscrollbar_ctrl.Maximum = owner.Items.Count - owner.MaxDropDownItems;
1521                                         show_scrollbar = vscrollbar_ctrl.Visible = true;
1522
1523                                 }
1524
1525                                 Size = new Size (width, height);
1526                                 textarea_drawable = ClientRectangle;
1527                                 textarea_drawable.Width = width;
1528                                 textarea_drawable.Height = height;
1529
1530                                 // Exclude decorations
1531                                 textarea_drawable.X += ThemeEngine.Current.DrawComboListBoxDecorationLeft (owner.DropDownStyle);
1532                                 textarea_drawable.Y += ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1533                                 textarea_drawable.Width -= ThemeEngine.Current.DrawComboListBoxDecorationRight (owner.DropDownStyle);
1534                                 textarea_drawable.Width -= ThemeEngine.Current.DrawComboListBoxDecorationLeft (owner.DropDownStyle);
1535                                 textarea_drawable.Height -= ThemeEngine.Current.DrawComboListBoxDecorationBottom (owner.DropDownStyle);
1536                                 textarea_drawable.Height -= ThemeEngine.Current.DrawComboListBoxDecorationTop (owner.DropDownStyle);
1537
1538                                 if (vscrollbar_ctrl != null && show_scrollbar)
1539                                         textarea_drawable.Width -= vscrollbar_ctrl.Width;
1540
1541                                 last_item = LastVisibleItem ();
1542                                 page_size = textarea_drawable.Height / (item_height - 2);
1543                         }
1544
1545                         private void Draw (Rectangle clip, Graphics dc)
1546                         {
1547                                 dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush
1548                                         (owner.BackColor), clip);
1549
1550                                 if (owner.Items.Count > 0) {
1551                                         Rectangle item_rect;
1552                                         DrawItemState state = DrawItemState.None;
1553
1554                                         for (int i = top_item; i <= last_item; i++) {
1555                                                 item_rect = GetItemDisplayRectangle (i, top_item);
1556
1557                                                 if (clip.IntersectsWith (item_rect) == false)
1558                                                         continue;
1559
1560                                                 /* Draw item */
1561                                                 state = DrawItemState.None;
1562
1563                                                 if (i == GetHighLightedIndex () ) {
1564                                                         state |= DrawItemState.Selected;
1565
1566                                                         if (owner.DropDownStyle == ComboBoxStyle.DropDownList) {
1567                                                                 state |= DrawItemState.Focus;
1568                                                         }
1569                                                 }
1570
1571                                                 owner.OnDrawItem (new DrawItemEventArgs (dc, owner.Font, item_rect,
1572                                                         i, state, owner.ForeColor, owner.BackColor));
1573                                         }
1574                                 }
1575
1576                                 ThemeEngine.Current.DrawComboListBoxDecorations (dc, owner, ClientRectangle);
1577                         }
1578
1579                         public int GetHighLightedIndex ()
1580                         {
1581                                 return owner.Items.IndexOf (highlighted_item);
1582                         }
1583
1584                         public object GetHighLightedItem ()
1585                         {
1586                                 return highlighted_item;
1587                         }
1588
1589                         private Rectangle GetItemDisplayRectangle (int index, int first_displayble)
1590                         {
1591                                 if (index < 0 || index >= owner.Items.Count)
1592                                         throw new  ArgumentOutOfRangeException ("GetItemRectangle index out of range.");
1593
1594                                 Rectangle item_rect = new Rectangle ();
1595                                 int height = owner.GetItemHeight (index);
1596
1597                                 item_rect.X = ThemeEngine.Current.DrawComboListBoxDecorationRight (owner.DropDownStyle);
1598                                 item_rect.Width = textarea_drawable.Width;
1599                                 item_rect.Y = 2 + ((height - 2) * (index - first_displayble));
1600                                 item_rect.Height = height;
1601                                 return item_rect;
1602                         }
1603
1604                         public void HideWindow ()
1605                         {
1606                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1607                                         return;
1608
1609                                 Capture = false;
1610                                 Hide ();
1611                                 highlighted_item = -1;
1612                                 owner.DropDownListBoxFinished ();
1613                         }
1614
1615                         private int IndexFromPointDisplayRectangle (int x, int y)
1616                         {
1617                                 for (int i = top_item; i <= last_item; i++) {
1618                                         if (GetItemDisplayRectangle (i, top_item).Contains (x, y) == true)
1619                                                 return i;
1620                                 }
1621
1622                                 return -1;
1623                         }
1624
1625                         protected override bool IsInputKey (Keys keyData)
1626                         {
1627                                 return owner.IsInputKey (keyData);
1628                         }
1629
1630                         private int LastVisibleItem ()
1631                         {
1632                                 Rectangle item_rect;
1633                                 int top_y = textarea_drawable.Y + textarea_drawable.Height;
1634                                 int i = 0;
1635
1636                                 for (i = top_item; i < owner.Items.Count; i++) {
1637                                         item_rect = GetItemDisplayRectangle (i, top_item);
1638                                         if (item_rect.Y + item_rect.Height > top_y) {
1639                                                 return i;
1640                                         }
1641                                 }
1642                                 return i - 1;
1643                         }
1644
1645                         private void NavigateItemVisually (ItemNavigation navigation)
1646                         {
1647                                 int item = -1;
1648
1649                                 switch (navigation) {
1650                                 case ItemNavigation.Next: {
1651                                         if (GetHighLightedIndex () + 1 < owner.Items.Count) {
1652
1653                                                 if (GetHighLightedIndex () + 1 > last_item) {
1654                                                         top_item++;
1655                                                         vscrollbar_ctrl.Value = top_item;
1656                                                 }
1657                                                 item = GetHighLightedIndex () + 1;
1658                                         }
1659                                         break;
1660                                 }
1661
1662                                 case ItemNavigation.Previous: {
1663                                         if (GetHighLightedIndex () > 0) {
1664
1665                                                 if (GetHighLightedIndex () - 1 < top_item) {
1666                                                         top_item--;
1667                                                         vscrollbar_ctrl.Value = top_item;
1668                                                 }
1669                                                 item = GetHighLightedIndex () - 1;
1670                                         }
1671                                         break;
1672                                 }
1673
1674                                 case ItemNavigation.NextPage: {
1675                                         if (GetHighLightedIndex () + page_size - 1 >= owner.Items.Count) {
1676                                                 top_item = owner.Items.Count - page_size;
1677                                                 vscrollbar_ctrl.Value = top_item;
1678                                                 item = owner.Items.Count - 1;
1679                                         }
1680                                         else {
1681                                                 if (GetHighLightedIndex () + page_size - 1  > last_item) {
1682                                                         top_item = GetHighLightedIndex ();
1683                                                         vscrollbar_ctrl.Value = GetHighLightedIndex ();
1684                                                 }
1685
1686                                                 item = GetHighLightedIndex () + page_size - 1;
1687                                         }
1688                                         break;
1689                                 }
1690
1691                                 case ItemNavigation.PreviousPage: {
1692
1693                                         /* Go to the first item*/
1694                                         if (GetHighLightedIndex () - (page_size - 1) <= 0) {
1695
1696                                                 top_item = 0;
1697                                                 vscrollbar_ctrl.Value = top_item;
1698                                                 item = 0;
1699                                         }
1700                                         else { /* One page back */
1701                                                 if (GetHighLightedIndex () - (page_size - 1)  < top_item) {
1702                                                         top_item = GetHighLightedIndex () - (page_size - 1);
1703                                                         vscrollbar_ctrl.Value = top_item;
1704                                                 }
1705
1706                                                 item = GetHighLightedIndex () - (page_size - 1);
1707                                         }
1708
1709                                         break;
1710                                 }
1711
1712                                 default:
1713                                         break;
1714                                 }
1715
1716                                 if (item != -1) {
1717                                         SetHighLightedItem (owner.Items[item]);
1718
1719                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1720
1721                                         if (owner.DropDownStyle == ComboBoxStyle.Simple) {
1722                                                 owner.SetControlText (owner.GetItemText (owner.Items[item]));
1723                                         }
1724                                 }
1725                         }
1726
1727                         private void OnKeyDownPUW (object sender, KeyEventArgs e)
1728                         {
1729                                 switch (e.KeyCode) {
1730                                 case Keys.Up:
1731                                         NavigateItemVisually (ItemNavigation.Previous);
1732                                         break;
1733
1734                                 case Keys.Down:
1735                                         NavigateItemVisually (ItemNavigation.Next);
1736                                         break;
1737
1738                                 case Keys.PageUp:
1739                                         NavigateItemVisually (ItemNavigation.PreviousPage);
1740                                         break;
1741
1742                                 case Keys.PageDown:
1743                                         NavigateItemVisually (ItemNavigation.NextPage);
1744                                         break;
1745
1746                                 default:
1747                                         break;
1748                                 }
1749                         }
1750
1751                         public void SetHighLightedItem (object item)
1752                         {
1753                                 Rectangle invalidate;
1754
1755                                 if (GetHighLightedItem () == item)
1756                                         return;
1757
1758                                 /* Previous item */
1759                                 if (GetHighLightedIndex () != -1) {
1760                                         invalidate = GetItemDisplayRectangle (GetHighLightedIndex (), top_item);
1761                                         if (ClientRectangle.Contains (invalidate))
1762                                                 Invalidate (invalidate);
1763                                 }
1764
1765                                 highlighted_item = item;
1766
1767                                 if (highlighted_item != null) {
1768                                          /* Current item */
1769                                         invalidate = GetItemDisplayRectangle (GetHighLightedIndex (), top_item);
1770                                         if (ClientRectangle.Contains (invalidate))
1771                                                 Invalidate (invalidate);
1772                                 }
1773
1774                         }
1775
1776                         public void SetTopItem (int item)
1777                         {
1778                                 top_item = item;
1779                                 UpdateLastVisibleItem ();
1780                                 Refresh ();
1781                         }
1782
1783                         private void OnMouseDownPUW (object sender, MouseEventArgs e)
1784                         {
1785                                 Rectangle scrollbar_screenrect;
1786                                 Point mouse_screen, scrollbar_screen;
1787                                 mouse_screen = PointToScreen (new Point (e.X, e.Y));
1788
1789                                 /* Click on an element ? */
1790                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1791                                 if (index != -1) {
1792                                         owner.SelectedIndex = index;
1793                                         SetHighLightedItem (owner.Items[index]);
1794                                         owner.OnSelectionChangeCommitted (new EventArgs ());
1795                                         HideWindow ();
1796                                         return;
1797                                 }
1798
1799                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1800                                         return;
1801
1802                                 /* Reroute event to scrollbar */
1803                                 if (vscrollbar_ctrl != null && vscrollbar_ctrl.Visible == true) {
1804                                         scrollbar_screenrect = vscrollbar_ctrl.ClientRectangle;
1805                                         scrollbar_screen = PointToScreen (vscrollbar_ctrl.Location);
1806                                         scrollbar_screenrect.X = scrollbar_screen.X;
1807                                         scrollbar_screenrect.Y = scrollbar_screen.Y;
1808
1809                                         if (scrollbar_screenrect.Contains (mouse_screen)){
1810                                                 Point pnt_client = vscrollbar_ctrl.PointToClient (mouse_screen);
1811                                                 vscrollbar_ctrl.FireMouseDown (new MouseEventArgs (e.Button, e.Clicks,
1812                                                         pnt_client.X, pnt_client.Y, e.Delta));
1813                                         } else  { /* Click in a non-client area*/
1814                                                 HideWindow ();
1815                                         }
1816                                 } else  { /* Click in a non-client area*/
1817                                         HideWindow ();
1818                                 }
1819                         }
1820
1821                         private void OnMouseMovePUW (object sender, MouseEventArgs e)
1822                         {
1823                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1824                                         return;
1825
1826                                 int index = IndexFromPointDisplayRectangle (e.X, e.Y);
1827
1828                                 if (index != -1) {
1829                                         SetHighLightedItem (owner.Items[index]);
1830                                         return;
1831                                 }
1832
1833                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1834                                         return;
1835
1836                                 /* Reroute event to scrollbar */
1837                                 if (vscrollbar_ctrl != null && vscrollbar_ctrl.Visible == true) {
1838                                         Rectangle scrollbar_screenrect;
1839                                         Point mouse_screen, scrollbar_screen;
1840                                         mouse_screen = PointToScreen (new Point (e.X, e.Y));
1841
1842                                         scrollbar_screenrect = vscrollbar_ctrl.ClientRectangle;
1843                                         scrollbar_screen = PointToScreen (vscrollbar_ctrl.Location);
1844                                         scrollbar_screenrect.X = scrollbar_screen.X;
1845                                         scrollbar_screenrect.Y = scrollbar_screen.Y;
1846
1847                                         if (scrollbar_screenrect.Contains (mouse_screen)){
1848                                                 Point pnt_client = vscrollbar_ctrl.PointToClient (mouse_screen);
1849
1850                                                 vscrollbar_ctrl.FireMouseMove (new MouseEventArgs (e.Button, e.Clicks,
1851                                                         pnt_client.X, pnt_client.Y, e.Delta));
1852                                         }
1853                                 }
1854                         }
1855
1856                         private void OnMouseUpPUW (object sender, MouseEventArgs e)
1857                         {
1858                                 if (owner.DropDownStyle == ComboBoxStyle.Simple)
1859                                         return;
1860
1861                                 /* Reroute event to scrollbar */
1862                                 Rectangle scrollbar_screenrect;
1863                                 Point mouse_screen, scrollbar_screen;
1864                                 mouse_screen = PointToScreen (new Point (e.X, e.Y));
1865
1866                                 if (vscrollbar_ctrl != null && vscrollbar_ctrl.Visible == true) {
1867                                         scrollbar_screenrect = vscrollbar_ctrl.ClientRectangle;
1868                                         scrollbar_screen = PointToScreen (vscrollbar_ctrl.Location);
1869                                         scrollbar_screenrect.X = scrollbar_screen.X;
1870                                         scrollbar_screenrect.Y = scrollbar_screen.Y;
1871
1872                                         if (scrollbar_screenrect.Contains (mouse_screen)){
1873                                                 Point pnt_client = vscrollbar_ctrl.PointToClient (mouse_screen);
1874
1875                                                 vscrollbar_ctrl.FireMouseUp (new MouseEventArgs (e.Button, e.Clicks,
1876                                                         pnt_client.X, pnt_client.Y, e.Delta));
1877                                         }
1878                                 }
1879                         }
1880
1881                         private void OnPaintPUW (Object o, PaintEventArgs pevent)
1882                         {
1883                                 Draw (pevent.ClipRectangle,pevent.Graphics);
1884                         }
1885
1886                         public bool ShowWindow ()
1887                         {
1888                                 if (owner.DropDownStyle != ComboBoxStyle.Simple && owner.Items.Count == 0)
1889                                         return false;
1890
1891                                 SetTopItem (0);
1892                                 SetHighLightedItem (owner.SelectedItem);
1893
1894                                 CalcListBoxArea ();
1895                                 Show ();
1896
1897                                 if (owner.DropDownStyle != ComboBoxStyle.Simple) {
1898                                         Capture = true;
1899                                 }
1900
1901                                 Refresh ();
1902
1903                                 if (owner.DropDown != null) {
1904                                         owner.DropDown (owner, EventArgs.Empty);
1905                                 }
1906
1907                                 return true;
1908                         }
1909
1910                         public void UpdateLastVisibleItem ()
1911                         {
1912                                 last_item = LastVisibleItem ();
1913                         }
1914
1915                         // Value Changed
1916                         private void VerticalScrollEvent (object sender, EventArgs e)
1917                         {
1918                                 top_item =  vscrollbar_ctrl.Value;
1919                                 UpdateLastVisibleItem ();
1920                                 Refresh ();
1921                         }
1922
1923                         #endregion Private Methods
1924                 }\r
1925         }
1926 }
1927