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

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2004-2006 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Peter Bartok    pbartok@novell.com
  24 //     Daniel Nauck    (dna(at)mono-project(dot)de)
  25 //
  26
  27 // NOT COMPLETE
  28
  29 using System;
  30 using System.Collections;
  31 using System.ComponentModel;
  32 using System.ComponentModel.Design;
  33 using System.Drawing;
  34 #if NET_2_0
  35 using System.Collections.Generic;
  36 using System.Runtime.InteropServices;
  37 #endif
  38
  39 namespace System.Windows.Forms {
  40
  41 #if NET_2_0
  42         [ComVisible(true)]
  43         [ClassInterface (ClassInterfaceType.AutoDispatch)]
  44         [Designer ("System.Windows.Forms.Design.TextBoxDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  45 #endif
  46         public class TextBox : TextBoxBase {
  47                 #region Variables
  48                 private ContextMenu     menu;
  49                 private MenuItem        undo;
  50                 private MenuItem        cut;
  51                 private MenuItem        copy;
  52                 private MenuItem        paste;
  53                 private MenuItem        delete;
  54                 private MenuItem        select_all;
  55
  56 #if NET_2_0
  57                 private bool use_system_password_char;
  58                 private AutoCompleteStringCollection auto_complete_custom_source;
  59                 private AutoCompleteMode auto_complete_mode = AutoCompleteMode.None;
  60                 private AutoCompleteSource auto_complete_source = AutoCompleteSource.None;
  61                 private AutoCompleteListBox auto_complete_listbox;
  62                 private string auto_complete_original_text;
  63                 private int auto_complete_selected_index = -1;
  64                 private List<string> auto_complete_matches;
  65                 private ComboBox auto_complete_cb_source;
  66 #endif
  67                 #endregion      // Variables
  68
  69                 #region Public Constructors
  70                 public TextBox() {
  71
  72                         scrollbars = RichTextBoxScrollBars.None;
  73                         alignment = HorizontalAlignment.Left;
  74                         this.LostFocus +=new EventHandler(TextBox_LostFocus);
  75                         this.RightToLeftChanged += new EventHandler (TextBox_RightToLeftChanged);
  76 #if NET_2_0
  77                         MouseWheel += new MouseEventHandler (TextBox_MouseWheel);
  78 #endif
  79
  80                         BackColor = SystemColors.Window;
  81                         ForeColor = SystemColors.WindowText;
  82                         backcolor_set = false;
  83
  84                         SetStyle (ControlStyles.StandardClick | ControlStyles.StandardDoubleClick, false);
  85                         SetStyle (ControlStyles.FixedHeight, true);
  86
  87                         undo = new MenuItem(Locale.GetText("&Undo"));
  88                         cut = new MenuItem(Locale.GetText("Cu&t"));
  89                         copy = new MenuItem(Locale.GetText("&Copy"));
  90                         paste = new MenuItem(Locale.GetText("&Paste"));
  91                         delete = new MenuItem(Locale.GetText("&Delete"));
  92                         select_all = new MenuItem(Locale.GetText("Select &All"));
  93
  94                         menu = new ContextMenu(new MenuItem[] { undo, new MenuItem("-"), cut, copy, paste, delete, new MenuItem("-"), select_all});
  95                         ContextMenu = menu;
  96
  97                         menu.Popup += new EventHandler(menu_Popup);
  98                         undo.Click += new EventHandler(undo_Click);
  99                         cut.Click += new EventHandler(cut_Click);
 100                         copy.Click += new EventHandler(copy_Click);
 101                         paste.Click += new EventHandler(paste_Click);
 102                         delete.Click += new EventHandler(delete_Click);
 103                         select_all.Click += new EventHandler(select_all_Click);
 104
 105                         document.multiline = false;
 106                 }
 107
 108                 #endregion      // Public Constructors
 109
 110                 #region Private & Internal Methods
 111
 112                 void TextBox_RightToLeftChanged (object sender, EventArgs e)
 113                 {
 114                         UpdateAlignment ();
 115                 }
 116
 117                 private void TextBox_LostFocus (object sender, EventArgs e) {
 118                         if (hide_selection)
 119                                 document.InvalidateSelectionArea ();
 120 #if NET_2_0
 121                         if (auto_complete_listbox != null && auto_complete_listbox.Visible)
 122                                 auto_complete_listbox.HideListBox (false);
 123 #endif
 124                 }
 125
 126 #if NET_2_0
 127                 private void TextBox_MouseWheel (object o, MouseEventArgs args)
 128                 {
 129                         if (auto_complete_listbox == null || !auto_complete_listbox.Visible)
 130                                 return;
 131
 132                         int lines = args.Delta / 120;
 133                         auto_complete_listbox.Scroll (-lines);
 134                 }
 135
 136                 private void ShowAutoCompleteListBox (bool is_backspace)
 137                 {
 138                         //
 139                         // We only support CustomSource by now
 140                         //
 141
 142                         IList source;
 143                         if (auto_complete_cb_source == null)
 144                                 source = auto_complete_custom_source;
 145                         else
 146                                 source = auto_complete_cb_source.Items;
 147
 148                         if (source == null || source.Count == 0)
 149                                 return;
 150
 151                         bool append = auto_complete_mode == AutoCompleteMode.Append || auto_complete_mode == AutoCompleteMode.SuggestAppend;
 152                         bool suggest = auto_complete_mode == AutoCompleteMode.Suggest || auto_complete_mode == AutoCompleteMode.SuggestAppend;
 153
 154                         if (Text.Length == 0) {
 155                                 if (auto_complete_listbox != null)
 156                                         auto_complete_listbox.HideListBox (false);
 157                                 return;
 158                         }
 159
 160                         if (auto_complete_matches == null)
 161                                 auto_complete_matches = new List<string> ();
 162
 163                         string text = Text;
 164                         auto_complete_matches.Clear ();
 165
 166                         for (int i = 0; i < source.Count; i++) {
 167                                 string item_text = auto_complete_cb_source == null ? auto_complete_custom_source [i] :
 168                                         auto_complete_cb_source.GetItemText (auto_complete_cb_source.Items [i]);
 169                                 if (item_text.StartsWith (text, StringComparison.CurrentCultureIgnoreCase))
 170                                         auto_complete_matches.Add (item_text);
 171                         }
 172
 173                         auto_complete_matches.Sort ();
 174
 175                         // Return if we have a single exact match
 176                         if ((auto_complete_matches.Count == 0) || (auto_complete_matches.Count == 1 &&
 177                                                 auto_complete_matches [0].Equals (text, StringComparison.CurrentCultureIgnoreCase))) {
 178
 179                                 if (auto_complete_listbox != null && auto_complete_listbox.Visible)
 180                                         auto_complete_listbox.HideListBox (false);
 181                                 return;
 182                         }
 183
 184                         auto_complete_selected_index = suggest ? -1 : 0;
 185
 186                         if (suggest) {
 187                                 if (auto_complete_listbox == null)
 188                                         auto_complete_listbox = new AutoCompleteListBox (this);
 189
 190                                 // Show or update auto complete listbox contents
 191                                 auto_complete_listbox.Location = PointToScreen (new Point (0, Height));
 192                                 auto_complete_listbox.ShowListBox ();
 193                         }
 194
 195                         if (append && !is_backspace)
 196                                 AppendAutoCompleteMatch (0);
 197
 198                         document.MoveCaret (CaretDirection.End);
 199                 }
 200
 201                 internal void HideAutoCompleteList ()
 202                 {
 203                         if (auto_complete_listbox != null)
 204                                 auto_complete_listbox.HideListBox (false);
 205                 }
 206
 207                 bool IsAutoCompleteAvailable {
 208                         get {
 209                                 if (auto_complete_source == AutoCompleteSource.None || auto_complete_mode == AutoCompleteMode.None)
 210                                         return false;
 211
 212                                 // We only support CustomSource by now
 213                                 if (auto_complete_source != AutoCompleteSource.CustomSource || auto_complete_custom_source == null ||
 214                                                 auto_complete_custom_source.Count == 0)
 215                                         return false;
 216
 217                                 return true;
 218                         }
 219                 }
 220
 221                 internal ComboBox AutoCompleteInternalSource {
 222                         get {
 223                                 return auto_complete_cb_source;
 224                         }
 225                         set {
 226                                 auto_complete_cb_source = value;
 227                         }
 228                 }
 229
 230                 internal bool CanNavigateAutoCompleteList {
 231                         get {
 232                                 if (auto_complete_mode == AutoCompleteMode.None)
 233                                         return false;
 234                                 if (auto_complete_matches == null || auto_complete_matches.Count == 0)
 235                                         return false;
 236
 237                                 bool suggest_window_visible = auto_complete_listbox != null && auto_complete_listbox.Visible;
 238                                 if (auto_complete_mode == AutoCompleteMode.Suggest && !suggest_window_visible)
 239                                         return false;
 240
 241                                 return true;
 242                         }
 243                 }
 244
 245                 bool NavigateAutoCompleteList (Keys key)
 246                 {
 247                         if (auto_complete_matches == null || auto_complete_matches.Count == 0)
 248                                 return false;
 249
 250                         bool suggest_window_visible = auto_complete_listbox != null && auto_complete_listbox.Visible;
 251                         if (!suggest_window_visible && auto_complete_mode == AutoCompleteMode.Suggest)
 252                                 return false;
 253
 254                         int index = auto_complete_selected_index;
 255
 256                         switch (key) {
 257                                 case Keys.Up:
 258                                         index -= 1;
 259                                         if (index < -1)
 260                                                 index = auto_complete_matches.Count - 1;
 261                                         break;
 262                                 case Keys.Down:
 263                                         index += 1;
 264                                         if (index >= auto_complete_matches.Count)
 265                                                 index = -1;
 266                                         break;
 267                                 case Keys.PageUp:
 268                                         if (auto_complete_mode == AutoCompleteMode.Append || !suggest_window_visible)
 269                                                 goto case Keys.Up;
 270
 271                                         if (index == -1)
 272                                                 index = auto_complete_matches.Count - 1;
 273                                         else if (index == 0)
 274                                                 index = -1;
 275                                         else {
 276                                                 index -= auto_complete_listbox.page_size - 1;
 277                                                 if (index < 0)
 278                                                         index = 0;
 279                                         }
 280                                         break;
 281                                 case Keys.PageDown:
 282                                         if (auto_complete_mode == AutoCompleteMode.Append || !suggest_window_visible)
 283                                                 goto case Keys.Down;
 284
 285                                         if (index == -1)
 286                                                 index = 0;
 287                                         else if (index == auto_complete_matches.Count - 1)
 288                                                 index = -1;
 289                                         else {
 290                                                 index += auto_complete_listbox.page_size - 1;
 291                                                 if (index >= auto_complete_matches.Count)
 292                                                         index = auto_complete_matches.Count - 1;
 293                                         }
 294                                         break;
 295                                 default:
 296                                         break;
 297                         }
 298
 299                         // In SuggestAppend mode the navigation mode depends on the visibility of the suggest lb.
 300                         bool suggest = auto_complete_mode == AutoCompleteMode.Suggest || auto_complete_mode == AutoCompleteMode.SuggestAppend;
 301                         if (suggest && suggest_window_visible) {
 302                                 Text = index == -1 ? auto_complete_original_text : auto_complete_matches [index];
 303                                 auto_complete_listbox.HighlightedIndex = index;
 304                         } else
 305                                 // Append only, not suggest at all
 306                                 AppendAutoCompleteMatch (index < 0 ? 0 : index);
 307
 308                         auto_complete_selected_index = index;
 309                         document.MoveCaret (CaretDirection.End);
 310
 311                         return true;
 312                 }
 313
 314                 void AppendAutoCompleteMatch (int index)
 315                 {
 316                         Text = auto_complete_original_text + auto_complete_matches [index].Substring (auto_complete_original_text.Length);
 317                         SelectionStart = auto_complete_original_text.Length;
 318                         SelectionLength = auto_complete_matches [index].Length - auto_complete_original_text.Length;
 319                 }
 320
 321 #endif
 322
 323                 private void UpdateAlignment ()
 324                 {
 325                         HorizontalAlignment new_alignment = alignment;
 326                         RightToLeft rtol = GetInheritedRtoL ();
 327
 328                         if (rtol == RightToLeft.Yes) {
 329                                 if (new_alignment == HorizontalAlignment.Left)
 330                                         new_alignment = HorizontalAlignment.Right;
 331                                 else if (new_alignment == HorizontalAlignment.Right)
 332                                         new_alignment = HorizontalAlignment.Left;
 333                         }
 334
 335                         document.alignment = new_alignment;
 336
 337                         // MS word-wraps if alignment isn't left
 338                         if (Multiline) {
 339                                 if (alignment != HorizontalAlignment.Left) {
 340                                         document.Wrap = true;
 341                                 } else {
 342                                         document.Wrap = word_wrap;
 343                                 }
 344                         }
 345
 346                         for (int i = 1; i <= document.Lines; i++) {
 347                                 document.GetLine (i).Alignment = new_alignment;
 348                         }
 349
 350                         document.RecalculateDocument (CreateGraphicsInternal ());
 351
 352                         Invalidate ();  // Make sure we refresh
 353                 }
 354
 355                 internal override Color ChangeBackColor (Color backColor)
 356                 {
 357                         if (backColor == Color.Empty) {
 358 #if NET_2_0
 359                                 if (!ReadOnly)
 360                                         backColor = SystemColors.Window;
 361 #else
 362                                 backColor = SystemColors.Window;
 363 #endif
 364                                 backcolor_set = false;
 365                         }
 366                         return backColor;
 367                 }
 368
 369 #if NET_2_0
 370                 void OnAutoCompleteCustomSourceChanged(object sender, CollectionChangeEventArgs e) {
 371                         if(auto_complete_source == AutoCompleteSource.CustomSource) {
 372                                 //FIXME: handle add, remove and refresh events in AutoComplete algorithm.
 373                         }
 374                 }
 375 #endif
 376                 #endregion      // Private & Internal Methods
 377
 378                 #region Public Instance Properties
 379 #if NET_2_0
 380                 [MonoTODO("AutoCompletion algorithm is currently not implemented.")]
 381                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 382                 [Browsable (true)]
 383                 [EditorBrowsable (EditorBrowsableState.Always)]
 384                 [Localizable (true)]
 385                 [Editor ("System.Windows.Forms.Design.ListControlStringCollectionEditor, " + Consts.AssemblySystem_Design,
 386                  "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
 387                 public AutoCompleteStringCollection AutoCompleteCustomSource {
 388                         get {
 389                                 if(auto_complete_custom_source == null) {
 390                                         auto_complete_custom_source = new AutoCompleteStringCollection ();
 391                                         auto_complete_custom_source.CollectionChanged += new CollectionChangeEventHandler (OnAutoCompleteCustomSourceChanged);
 392                                 }
 393                                 return auto_complete_custom_source;
 394                         }
 395                         set {
 396                                 if(auto_complete_custom_source == value)
 397                                         return;
 398
 399                                 if(auto_complete_custom_source != null) //remove eventhandler from old collection
 400                                         auto_complete_custom_source.CollectionChanged -= new CollectionChangeEventHandler (OnAutoCompleteCustomSourceChanged);
 401
 402                                 auto_complete_custom_source = value;
 403
 404                                 if(auto_complete_custom_source != null)
 405                                         auto_complete_custom_source.CollectionChanged += new CollectionChangeEventHandler (OnAutoCompleteCustomSourceChanged);
 406                         }
 407                 }
 408
 409                 [MonoTODO("AutoCompletion algorithm is currently not implemented.")]
 410                 [Browsable (true)]
 411                 [EditorBrowsable (EditorBrowsableState.Always)]
 412                 [DefaultValue (AutoCompleteMode.None)]
 413                 public AutoCompleteMode AutoCompleteMode {
 414                         get { return auto_complete_mode; }
 415                         set {
 416                                 if(auto_complete_mode == value)
 417                                         return;
 418
 419                                 if((value < AutoCompleteMode.None) || (value > AutoCompleteMode.SuggestAppend))
 420                                         throw new InvalidEnumArgumentException (Locale.GetText ("Enum argument value '{0}' is not valid for AutoCompleteMode", value));
 421
 422                                 auto_complete_mode = value;
 423                         }
 424                 }
 425
 426                 [MonoTODO("AutoCompletion algorithm is currently not implemented.")]
 427                 [Browsable (true)]
 428                 [EditorBrowsable (EditorBrowsableState.Always)]
 429                 [DefaultValue (AutoCompleteSource.None)]
 430                 [TypeConverter (typeof (TextBoxAutoCompleteSourceConverter))]
 431                 public AutoCompleteSource AutoCompleteSource {
 432                         get { return auto_complete_source; }
 433                         set {
 434                                 if(auto_complete_source == value)
 435                                         return;
 436
 437                                 if(!Enum.IsDefined (typeof (AutoCompleteSource), value))
 438                                         throw new InvalidEnumArgumentException (Locale.GetText ("Enum argument value '{0}' is not valid for AutoCompleteSource", value));
 439
 440                                 auto_complete_source = value;
 441                         }
 442                 }
 443
 444                 [DefaultValue(false)]
 445                 [RefreshProperties (RefreshProperties.Repaint)]
 446                 public bool UseSystemPasswordChar {
 447                         get {
 448                                 return use_system_password_char;
 449                         }
 450
 451                         set {
 452                                 if (use_system_password_char != value) {
 453                                         use_system_password_char = value;
 454
 455                                         if (!Multiline)
 456                                                 document.PasswordChar = PasswordChar.ToString ();
 457                                         else
 458                                                 document.PasswordChar = string.Empty;
 459                                         Invalidate ();
 460                                 }
 461                         }
 462                 }
 463 #endif
 464
 465                 [DefaultValue(false)]
 466                 [MWFCategory("Behavior")]
 467                 public bool AcceptsReturn {
 468                         get {
 469                                 return accepts_return;
 470                         }
 471
 472                         set {
 473                                 if (value != accepts_return) {
 474                                         accepts_return = value;
 475                                 }
 476                         }
 477                 }
 478
 479                 [DefaultValue(CharacterCasing.Normal)]
 480                 [MWFCategory("Behavior")]
 481                 public CharacterCasing CharacterCasing {
 482                         get {
 483                                 return character_casing;
 484                         }
 485
 486                         set {
 487                                 if (value != character_casing) {
 488                                         character_casing = value;
 489                                 }
 490                         }
 491                 }
 492
 493                 [Localizable(true)]
 494                 [DefaultValue('\0')]
 495                 [MWFCategory("Behavior")]
 496 #if NET_2_0
 497                 [RefreshProperties (RefreshProperties.Repaint)]
 498 #endif
 499                 public char PasswordChar {
 500                         get {
 501 #if NET_2_0
 502                                 if (use_system_password_char) {
 503                                         return '*';
 504                                 }
 505 #endif
 506                                 return password_char;
 507                         }
 508
 509                         set {
 510                                 if (value != password_char) {
 511                                         password_char = value;
 512                                         if (!Multiline) {
 513                                                 document.PasswordChar = PasswordChar.ToString ();
 514                                         } else {
 515                                                 document.PasswordChar = string.Empty;
 516                                         }
 517                                         this.CalculateDocument();
 518                                 }
 519                         }
 520                 }
 521
 522                 [DefaultValue(ScrollBars.None)]
 523                 [Localizable(true)]
 524                 [MWFCategory("Appearance")]
 525                 public ScrollBars ScrollBars {
 526                         get {
 527                                 return (ScrollBars)scrollbars;
 528                         }
 529
 530                         set {
 531                                 if (!Enum.IsDefined (typeof (ScrollBars), value))
 532                                         throw new InvalidEnumArgumentException ("value", (int) value,
 533                                                 typeof (ScrollBars));
 534
 535                                 if (value != (ScrollBars)scrollbars) {
 536                                         scrollbars = (RichTextBoxScrollBars)value;
 537                                         base.CalculateScrollBars();
 538                                 }
 539                         }
 540                 }
 541
 542 #if ONLY_1_1
 543                 [Browsable(false)]
 544                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 545                 public override int SelectionLength {
 546                         get {
 547                                 return base.SelectionLength;
 548                         }
 549                         set {
 550                                 base.SelectionLength = value;
 551                         }
 552                 }
 553 #endif
 554
 555                 public override string Text {
 556                         get {
 557                                 return base.Text;
 558                         }
 559
 560                         set {
 561                                 base.Text = value;
 562                         }
 563                 }
 564
 565                 [DefaultValue(HorizontalAlignment.Left)]
 566                 [Localizable(true)]
 567                 [MWFCategory("Appearance")]
 568                 public HorizontalAlignment TextAlign {
 569                         get {
 570                                 return alignment;
 571                         }
 572
 573                         set {
 574                                 if (value != alignment) {
 575                                         alignment = value;
 576
 577                                         UpdateAlignment ();
 578
 579                                         OnTextAlignChanged(EventArgs.Empty);
 580                                 }
 581                         }
 582                 }
 583                 #endregion      // Public Instance Properties
 584
 585 #if NET_2_0
 586                 public void Paste (string text)
 587                 {
 588                         document.ReplaceSelection (CaseAdjust (text), false);
 589
 590                         ScrollToCaret();
 591                         OnTextChanged(EventArgs.Empty);
 592                 }
 593 #endif
 594                 #region Protected Instance Methods
 595                 protected override CreateParams CreateParams {
 596                         get {
 597                                 return base.CreateParams;
 598                         }
 599                 }
 600
 601 #if ONLY_1_1
 602                 protected override ImeMode DefaultImeMode {
 603                         get {
 604                                 return base.DefaultImeMode;
 605                         }
 606                 }
 607 #endif
 608 #if NET_2_0
 609                 protected override void Dispose (bool disposing)
 610                 {
 611                         base.Dispose (disposing);
 612                 }
 613 #endif
 614
 615                 protected override bool IsInputKey (Keys keyData)
 616                 {
 617                         return base.IsInputKey (keyData);
 618                 }
 619
 620                 protected override void OnGotFocus (EventArgs e)
 621                 {
 622                         base.OnGotFocus (e);
 623                         if (selection_length == -1 && !has_been_focused)
 624                                 SelectAllNoScroll ();
 625                         has_been_focused = true;
 626                 }
 627
 628                 protected override void OnHandleCreated (EventArgs e)
 629                 {
 630                         base.OnHandleCreated (e);
 631                 }
 632
 633 #if ONLY_1_1
 634                 protected override void OnMouseUp(MouseEventArgs mevent)
 635                 {
 636                         base.OnMouseUp (mevent);
 637                 }
 638 #endif
 639
 640                 protected virtual void OnTextAlignChanged (EventArgs e)
 641                 {
 642                         EventHandler eh = (EventHandler)(Events [TextAlignChangedEvent]);
 643                         if (eh != null)
 644                                 eh (this, e);
 645                 }
 646
 647                 protected override void WndProc (ref Message m)
 648                 {
 649                         switch ((Msg)m.Msg) {
 650 #if NET_2_0
 651                                 case Msg.WM_KEYDOWN:
 652                                         if (!IsAutoCompleteAvailable)
 653                                                 break;
 654
 655                                         Keys key_data = (Keys)m.WParam.ToInt32 ();
 656                                         switch (key_data) {
 657                                                 case Keys.Down:
 658                                                 case Keys.Up:
 659                                                 case Keys.PageDown:
 660                                                 case Keys.PageUp:
 661                                                         if (NavigateAutoCompleteList (key_data)) {
 662                                                                 m.Result = IntPtr.Zero;
 663                                                                 return;
 664                                                         }
 665                                                         break;
 666                                                 case Keys.Enter:
 667                                                         if (auto_complete_listbox != null && auto_complete_listbox.Visible)
 668                                                                 auto_complete_listbox.HideListBox (false);
 669                                                         SelectAll ();
 670                                                         break;
 671                                                 case Keys.Escape:
 672                                                         if (auto_complete_listbox != null && auto_complete_listbox.Visible)
 673                                                                 auto_complete_listbox.HideListBox (false);
 674                                                         break;
 675                                                 default:
 676                                                         break;
 677                                         }
 678                                         break;
 679                                 case Msg.WM_CHAR:
 680                                         if (!IsAutoCompleteAvailable)
 681                                                 break;
 682
 683                                         bool is_backspace = m.WParam.ToInt32 () == 8;
 684                                         if (!Char.IsLetterOrDigit ((char)m.WParam) && !is_backspace)
 685                                                 break;
 686
 687                                         if (!is_backspace)
 688                                                 Text = auto_complete_original_text;
 689
 690                                         document.MoveCaret (CaretDirection.End);
 691
 692                                         // Need to call base.WndProc before to have access to
 693                                         // the updated Text property value
 694                                         base.WndProc (ref m);
 695                                         auto_complete_original_text = Text;
 696                                         ShowAutoCompleteListBox (is_backspace);
 697                                         return;
 698 #endif
 699                                 case Msg.WM_LBUTTONDOWN:
 700                                         // When the textbox gets focus by LBUTTON (but not by middle or right)
 701                                         // it does not do the select all / scroll thing.
 702                                         has_been_focused = true;
 703                                         FocusInternal (true);
 704                                         break;
 705                         }
 706
 707                         base.WndProc(ref m);
 708                 }
 709                 #endregion      // Protected Instance Methods
 710
 711                 #region Events
 712                 static object TextAlignChangedEvent = new object ();
 713
 714                 public event EventHandler TextAlignChanged {
 715                         add { Events.AddHandler (TextAlignChangedEvent, value); }
 716                         remove { Events.RemoveHandler (TextAlignChangedEvent, value); }
 717                 }
 718                 #endregion      // Events
 719
 720                 #region Private Methods
 721
 722                 internal override ContextMenu ContextMenuInternal {
 723                         get {
 724                                 ContextMenu res = base.ContextMenuInternal;
 725                                 if (res == menu)
 726                                         return null;
 727                                 return res;
 728                         }
 729                         set {
 730                                 base.ContextMenuInternal = value;
 731                         }
 732                 }
 733
 734                 internal void RestoreContextMenu ()
 735                 {
 736                         ContextMenuInternal = menu;
 737                 }
 738
 739                 private void menu_Popup(object sender, EventArgs e) {
 740                         if (SelectionLength == 0) {
 741                                 cut.Enabled = false;
 742                                 copy.Enabled = false;
 743                         } else {
 744                                 cut.Enabled = true;
 745                                 copy.Enabled = true;
 746                         }
 747
 748                         if (SelectionLength == TextLength) {
 749                                 select_all.Enabled = false;
 750                         } else {
 751                                 select_all.Enabled = true;
 752                         }
 753
 754                         if (!CanUndo) {
 755                                 undo.Enabled = false;
 756                         } else {
 757                                 undo.Enabled = true;
 758                         }
 759
 760                         if (ReadOnly) {
 761                                 undo.Enabled = cut.Enabled = paste.Enabled = delete.Enabled = false;
 762                         }
 763                 }
 764
 765                 private void undo_Click(object sender, EventArgs e) {
 766                         Undo();
 767                 }
 768
 769                 private void cut_Click(object sender, EventArgs e) {
 770                         Cut();
 771                 }
 772
 773                 private void copy_Click(object sender, EventArgs e) {
 774                         Copy();
 775                 }
 776
 777                 private void paste_Click(object sender, EventArgs e) {
 778                         Paste();
 779                 }
 780
 781                 private void delete_Click(object sender, EventArgs e) {
 782                         SelectedText = string.Empty;
 783                 }
 784
 785                 private void select_all_Click(object sender, EventArgs e) {
 786                         SelectAll();
 787                 }
 788                 #endregion      // Private Methods
 789
 790 #if NET_2_0
 791                 public override bool Multiline {
 792                         get {
 793                                 return base.Multiline;
 794                         }
 795
 796                         set {
 797                                 base.Multiline = value;
 798                         }
 799                 }
 800
 801                 protected override void OnBackColorChanged (EventArgs e)
 802                 {
 803                         base.OnBackColorChanged (e);
 804                 }
 805
 806                 protected override void OnFontChanged (EventArgs e)
 807                 {
 808                         base.OnFontChanged (e);
 809                 }
 810
 811                 protected override void OnHandleDestroyed (EventArgs e)
 812                 {
 813                         base.OnHandleDestroyed (e);
 814                 }
 815
 816                 class AutoCompleteListBox : Control
 817                 {
 818                         TextBox owner;
 819                         VScrollBar vscroll;
 820                         int top_item;
 821                         int last_item;
 822                         internal int page_size;
 823                         int item_height;
 824                         int highlighted_index = -1;
 825                         bool user_defined_size;
 826                         bool resizing;
 827                         Rectangle resizer_bounds;
 828
 829                         const int DefaultDropDownItems = 7;
 830
 831                         public AutoCompleteListBox (TextBox tb)
 832                         {
 833                                 owner = tb;
 834                                 item_height = FontHeight + 2;
 835
 836                                 vscroll = new VScrollBar ();
 837                                 vscroll.ValueChanged += VScrollValueChanged;
 838                                 Controls.Add (vscroll);
 839
 840                                 is_visible = false;
 841                                 InternalBorderStyle = BorderStyle.FixedSingle;
 842                         }
 843
 844                         protected override CreateParams CreateParams {
 845                                 get {
 846                                         CreateParams cp = base.CreateParams;
 847
 848                                         cp.Style ^= (int)WindowStyles.WS_CHILD;
 849                                         cp.Style ^= (int)WindowStyles.WS_VISIBLE;
 850                                         cp.Style |= (int)WindowStyles.WS_POPUP;
 851                                         cp.ExStyle |= (int)WindowExStyles.WS_EX_TOPMOST | (int)WindowExStyles.WS_EX_TOOLWINDOW;
 852                                         return cp;
 853                                 }
 854                         }
 855
 856                         public int HighlightedIndex {
 857                                 get {
 858                                         return highlighted_index;
 859                                 }
 860                                 set {
 861                                         if (value == highlighted_index)
 862                                                 return;
 863
 864                                         if (highlighted_index != -1)
 865                                                 Invalidate (GetItemBounds (highlighted_index));
 866                                         highlighted_index = value;
 867                                         if (highlighted_index != -1)
 868                                                 Invalidate (GetItemBounds (highlighted_index));
 869
 870                                         if (highlighted_index != -1)
 871                                                 EnsureVisible (highlighted_index);
 872                                 }
 873                         }
 874
 875                         public void Scroll (int lines)
 876                         {
 877                                 int max = vscroll.Maximum - page_size + 1;
 878                                 int val = vscroll.Value + lines;
 879                                 if (val > max)
 880                                         val = max;
 881                                 else if (val < vscroll.Minimum)
 882                                         val = vscroll.Minimum;
 883
 884                                 vscroll.Value = val;
 885                         }
 886
 887                         public void EnsureVisible (int index)
 888                         {
 889                                 if (index < top_item) {
 890                                         vscroll.Value = index;
 891                                 } else {
 892                                         int max = vscroll.Maximum - page_size + 1;
 893                                         int rows = Height / item_height;
 894                                         if (index > top_item + rows - 1) {
 895                                                 index = index - rows + 1;
 896                                                 vscroll.Value = index > max ? max : index;
 897                                         }
 898                                 }
 899                         }
 900
 901                         internal override bool ActivateOnShow {
 902                                 get {
 903                                         return false;
 904                                 }
 905                         }
 906
 907                         void VScrollValueChanged (object o, EventArgs args)
 908                         {
 909                                 if (top_item == vscroll.Value)
 910                                         return;
 911
 912                                 top_item = vscroll.Value;
 913                                 last_item = GetLastVisibleItem ();
 914                                 Invalidate ();
 915                         }
 916
 917                         int GetLastVisibleItem ()
 918                         {
 919                                 int top_y = Height;
 920
 921                                 for (int i = top_item; i < owner.auto_complete_matches.Count; i++) {
 922                                         int pos = i - top_item; // relative to visible area
 923                                         if ((pos * item_height) + item_height >= top_y)
 924                                                 return i;
 925                                 }
 926
 927                                 return owner.auto_complete_matches.Count - 1;
 928                         }
 929
 930                         Rectangle GetItemBounds (int index)
 931                         {
 932                                 int pos = index - top_item;
 933                                 Rectangle bounds = new Rectangle (0, pos * item_height, Width, item_height);
 934                                 if (vscroll.Visible)
 935                                         bounds.Width -= vscroll.Width;
 936
 937                                 return bounds;
 938                         }
 939
 940                         int GetItemAt (Point loc)
 941                         {
 942                                 if (loc.Y > (last_item - top_item) * item_height + item_height)
 943                                         return -1;
 944
 945                                 int retval = loc.Y / item_height;
 946                                 retval += top_item;
 947
 948                                 return retval;
 949                         }
 950
 951                         void LayoutListBox ()
 952                         {
 953                                 int total_height = owner.auto_complete_matches.Count * item_height;
 954                                 page_size = Math.Max (Height / item_height, 1);
 955                                 last_item = GetLastVisibleItem ();
 956
 957                                 if (Height < total_height) {
 958                                         vscroll.Visible = true;
 959                                         vscroll.Maximum = owner.auto_complete_matches.Count - 1;
 960                                         vscroll.LargeChange = page_size;
 961                                         vscroll.Location = new Point (Width - vscroll.Width, 0);
 962                                         vscroll.Height = Height - item_height;
 963                                 } else
 964                                         vscroll.Visible = false;
 965
 966                                 resizer_bounds = new Rectangle (Width - item_height, Height - item_height,
 967                                                 item_height, item_height);
 968                         }
 969
 970                         public void HideListBox (bool set_text)
 971                         {
 972                                 if (set_text)
 973                                         owner.Text = owner.auto_complete_matches [HighlightedIndex];
 974
 975                                 Capture = false;
 976                                 Hide ();
 977                         }
 978
 979                         public void ShowListBox ()
 980                         {
 981                                 if (!user_defined_size) {
 982                                         // This should call the Layout routine for us
 983                                         int height = owner.auto_complete_matches.Count > DefaultDropDownItems ?
 984                                                 DefaultDropDownItems * item_height : (owner.auto_complete_matches.Count + 1) * item_height;
 985                                         Size = new Size (owner.Width, height);
 986                                 } else
 987                                         LayoutListBox ();
 988
 989                                 vscroll.Value = 0;
 990                                 HighlightedIndex = -1;
 991
 992                                 Show ();
 993                                 Invalidate ();
 994                         }
 995
 996                         protected override void OnResize (EventArgs args)
 997                         {
 998                                 base.OnResize (args);
 999
1000                                 LayoutListBox ();
1001                                 Refresh ();
1002                         }
1003
1004                         protected override void OnMouseDown (MouseEventArgs args)
1005                         {
1006                                 base.OnMouseDown (args);
1007
1008                                 if (!resizer_bounds.Contains (args.Location))
1009                                         return;
1010
1011                                 user_defined_size = true;
1012                                 resizing = true;
1013                                 Capture = true;
1014                         }
1015
1016                         protected override void OnMouseMove (MouseEventArgs args)
1017                         {
1018                                 base.OnMouseMove (args);
1019
1020                                 if (resizing) {
1021                                         Point mouse_loc = Control.MousePosition;
1022                                         Point ctrl_loc = PointToScreen (Point.Empty);
1023
1024                                         Size new_size = new Size (mouse_loc.X - ctrl_loc.X, mouse_loc.Y - ctrl_loc.Y);
1025                                         if (new_size.Height < item_height)
1026                                                 new_size.Height = item_height;
1027                                         if (new_size.Width < item_height)
1028                                                 new_size.Width = item_height;
1029
1030                                         Size = new_size;
1031                                         return;
1032                                 }
1033
1034                                 Cursor = resizer_bounds.Contains (args.Location) ? Cursors.SizeNWSE : Cursors.Default;
1035
1036                                 int item_idx = GetItemAt (args.Location);
1037                                 if (item_idx != -1)
1038                                         HighlightedIndex = item_idx;
1039                         }
1040
1041                         protected override void OnMouseUp (MouseEventArgs args)
1042                         {
1043                                 base.OnMouseUp (args);
1044
1045                                 int item_idx = GetItemAt (args.Location);
1046                                 if (item_idx != -1 && !resizing)
1047                                         HideListBox (true);
1048
1049                                 resizing = false;
1050                                 Capture = false;
1051                         }
1052
1053                         internal override void OnPaintInternal (PaintEventArgs args)
1054                         {
1055                                 Graphics g = args.Graphics;
1056                                 Brush brush = ThemeEngine.Current.ResPool.GetSolidBrush (ForeColor);
1057
1058                                 int highlighted_idx = HighlightedIndex;
1059
1060                                 int y = 0;
1061                                 int last = GetLastVisibleItem ();
1062                                 for (int i = top_item; i <= last; i++) {
1063                                         Rectangle item_bounds = GetItemBounds (i);
1064                                         if (!item_bounds.IntersectsWith (args.ClipRectangle))
1065                                                 continue;
1066
1067                                         if (i == highlighted_idx) {
1068                                                 g.FillRectangle (SystemBrushes.Highlight, item_bounds);
1069                                                 g.DrawString (owner.auto_complete_matches [i], Font, SystemBrushes.HighlightText, item_bounds);
1070                                         } else
1071                                                 g.DrawString (owner.auto_complete_matches [i], Font, brush, item_bounds);
1072
1073                                         y += item_height;
1074                                 }
1075
1076                                 ThemeEngine.Current.CPDrawSizeGrip (g, SystemColors.Control, resizer_bounds);
1077                         }
1078                 }
1079 #endif
1080         }
1081
1082 #if NET_2_0
1083         internal class TextBoxAutoCompleteSourceConverter : EnumConverter
1084         {
1085                 public TextBoxAutoCompleteSourceConverter(Type type)
1086                         : base(type)
1087                 { }
1088
1089                 public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
1090                 {
1091                         StandardValuesCollection stdv = base.GetStandardValues(context);
1092                         AutoCompleteSource[] arr = new AutoCompleteSource[stdv.Count];
1093                         stdv.CopyTo(arr, 0);
1094                         AutoCompleteSource[] arr2 = Array.FindAll(arr, delegate (AutoCompleteSource value) {
1095                                 // No "ListItems" in a TextBox.
1096                                 return value != AutoCompleteSource.ListItems;
1097                         });
1098                         return new StandardValuesCollection(arr2);
1099                 }
1100         }
1101 #endif
1102 }