src/motif/textctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        textctrl.cpp
   3 // Purpose:     wxTextCtrl
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     17/09/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "textctrl.h"
  22 #endif
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fstream.h>
  27 #include <ctype.h>
  28
  29 #include "wx/textctrl.h"
  30 #include "wx/settings.h"
  31 #include "wx/filefn.h"
  32 #include "wx/utils.h"
  33
  34 #include <Xm/Text.h>
  35
  36 #include "wx/motif/private.h"
  37
  38 // ----------------------------------------------------------------------------
  39 // private functions
  40 // ----------------------------------------------------------------------------
  41
  42 // helper: inserts the new text in the value of the text ctrl and returns the
  43 // result in place
  44 static void MergeChangesIntoString(wxString& value,
  45                                    XmTextVerifyCallbackStruct *textStruct);
  46
  47 // callbacks
  48 static void wxTextWindowChangedProc(Widget w, XtPointer clientData, XtPointer ptr);
  49 static void wxTextWindowModifyProc(Widget w, XtPointer clientData, XmTextVerifyCallbackStruct *cbs);
  50 static void wxTextWindowGainFocusProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs);
  51 static void wxTextWindowLoseFocusProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs);
  52 static void wxTextWindowActivateProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *ptr);
  53
  54 #if !USE_SHARED_LIBRARY
  55     IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  56
  57     BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  58         EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  59         EVT_CHAR(wxTextCtrl::OnChar)
  60
  61     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
  62     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
  63     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
  64     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
  65     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
  66
  67     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
  68     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
  69     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
  70     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
  71     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
  72
  73     END_EVENT_TABLE()
  74 #endif
  75
  76 // ============================================================================
  77 // implementation
  78 // ============================================================================
  79
  80 // ----------------------------------------------------------------------------
  81 // wxTextCtrl
  82 // ----------------------------------------------------------------------------
  83
  84 // Text item
  85 wxTextCtrl::wxTextCtrl()
  86 {
  87     m_tempCallbackStruct = (void*) NULL;
  88     m_modified = FALSE;
  89     m_processedDefault = FALSE;
  90 }
  91
  92 bool wxTextCtrl::Create(wxWindow *parent,
  93                         wxWindowID id,
  94                         const wxString& value,
  95                         const wxPoint& pos,
  96                         const wxSize& size,
  97                         long style,
  98                         const wxValidator& validator,
  99                         const wxString& name)
 100 {
 101     m_tempCallbackStruct = (void*) NULL;
 102     m_modified = FALSE;
 103     m_processedDefault = FALSE;
 104     //    m_backgroundColour = parent->GetBackgroundColour();
 105     m_backgroundColour = * wxWHITE;
 106     m_foregroundColour = parent->GetForegroundColour();
 107
 108     SetName(name);
 109     SetValidator(validator);
 110     if (parent)
 111         parent->AddChild(this);
 112
 113     m_windowStyle = style;
 114
 115     if ( id == -1 )
 116         m_windowId = (int)NewControlId();
 117     else
 118         m_windowId = id;
 119
 120     Widget parentWidget = (Widget) parent->GetClientWidget();
 121
 122     bool wantHorizScrolling = ((m_windowStyle & wxHSCROLL) != 0);
 123
 124     // If we don't have horizontal scrollbars, we want word wrap.
 125     bool wantWordWrap = !wantHorizScrolling;
 126
 127     if (m_windowStyle & wxTE_MULTILINE)
 128     {
 129         Arg args[2];
 130         XtSetArg (args[0], XmNscrollHorizontal, wantHorizScrolling ? True : False);
 131         XtSetArg (args[1], XmNwordWrap, wantWordWrap ? True : False);
 132
 133         m_mainWidget = (WXWidget) XmCreateScrolledText(parentWidget,
 134                                                        (char*)name.c_str(),
 135                                                        args, 2);
 136
 137         XtVaSetValues ((Widget) m_mainWidget,
 138                         XmNeditable, ((style & wxTE_READONLY) ? False : True),
 139                         XmNeditMode, XmMULTI_LINE_EDIT,
 140                         NULL);
 141         XtManageChild ((Widget) m_mainWidget);
 142     }
 143     else
 144     {
 145         m_mainWidget = (WXWidget)XtVaCreateManagedWidget
 146                                  (
 147                                   (char*)name.c_str(),
 148                                   xmTextWidgetClass,
 149                                   parentWidget,
 150                                   NULL
 151                                  );
 152
 153         // TODO: Is this relevant? What does it do?
 154         int noCols = 2;
 155         if (!value.IsNull() && (value.Length() > (unsigned int) noCols))
 156             noCols = value.Length();
 157         XtVaSetValues((Widget) m_mainWidget,
 158                       XmNcolumns, noCols,
 159                       NULL);
 160     }
 161
 162     // remove border if asked for
 163     if ( style & wxNO_BORDER )
 164     {
 165         XtVaSetValues((Widget)m_mainWidget,
 166                       XmNshadowThickness, 0,
 167                       NULL);
 168     }
 169
 170     if ( !!value )
 171         XmTextSetString ((Widget) m_mainWidget, (char*)value.c_str());
 172
 173     // install callbacks
 174     XtAddCallback((Widget) m_mainWidget, XmNvalueChangedCallback, (XtCallbackProc)wxTextWindowChangedProc, (XtPointer)this);
 175
 176     XtAddCallback((Widget) m_mainWidget, XmNmodifyVerifyCallback, (XtCallbackProc)wxTextWindowModifyProc, (XtPointer)this);
 177
 178     XtAddCallback((Widget) m_mainWidget, XmNactivateCallback, (XtCallbackProc)wxTextWindowActivateProc, (XtPointer)this);
 179
 180     XtAddCallback((Widget) m_mainWidget, XmNfocusCallback, (XtCallbackProc)wxTextWindowGainFocusProc, (XtPointer)this);
 181
 182     XtAddCallback((Widget) m_mainWidget, XmNlosingFocusCallback, (XtCallbackProc)wxTextWindowLoseFocusProc, (XtPointer)this);
 183
 184     // font
 185     m_font = parent->GetFont();
 186     ChangeFont(FALSE);
 187
 188     SetCanAddEventHandler(TRUE);
 189     AttachWidget (parent, m_mainWidget, (WXWidget) NULL, pos.x, pos.y, size.x, size.y);
 190
 191     ChangeBackgroundColour();
 192
 193     return TRUE;
 194 }
 195
 196 WXWidget wxTextCtrl::GetTopWidget() const
 197 {
 198     return ((m_windowStyle & wxTE_MULTILINE) ? (WXWidget) XtParent((Widget) m_mainWidget) : m_mainWidget);
 199 }
 200
 201 wxString wxTextCtrl::GetValue() const
 202 {
 203     wxString str; // result
 204
 205     if (m_windowStyle & wxTE_PASSWORD)
 206     {
 207         // the value is stored always in m_value because it can't be retrieved
 208         // from the text control
 209         str = m_value;
 210     }
 211     else
 212     {
 213         // just get the string from Motif
 214         char *s = XmTextGetString ((Widget) m_mainWidget);
 215         if ( s )
 216         {
 217             str = s;
 218             XtFree (s);
 219         }
 220         //else: return empty string
 221
 222         if ( m_tempCallbackStruct )
 223         {
 224             // the string in the control isn't yet updated, can't use it as is
 225             MergeChangesIntoString(str, (XmTextVerifyCallbackStruct *)
 226                                    m_tempCallbackStruct);
 227         }
 228     }
 229
 230     return str;
 231 }
 232
 233 void wxTextCtrl::SetValue(const wxString& value)
 234 {
 235     m_inSetValue = TRUE;
 236
 237     XmTextSetString ((Widget) m_mainWidget, (char*)value.c_str());
 238
 239     m_inSetValue = FALSE;
 240 }
 241
 242 // Clipboard operations
 243 void wxTextCtrl::Copy()
 244 {
 245     XmTextCopy((Widget) m_mainWidget, CurrentTime);
 246 }
 247
 248 void wxTextCtrl::Cut()
 249 {
 250     XmTextCut((Widget) m_mainWidget, CurrentTime);
 251 }
 252
 253 void wxTextCtrl::Paste()
 254 {
 255     XmTextPaste((Widget) m_mainWidget);
 256 }
 257
 258 bool wxTextCtrl::CanCopy() const
 259 {
 260     // Can copy if there's a selection
 261     long from, to;
 262     GetSelection(& from, & to);
 263     return (from != to) ;
 264 }
 265
 266 bool wxTextCtrl::CanCut() const
 267 {
 268     // Can cut if there's a selection
 269     long from, to;
 270     GetSelection(& from, & to);
 271     return (from != to) ;
 272 }
 273
 274 bool wxTextCtrl::CanPaste() const
 275 {
 276     return IsEditable() ;
 277 }
 278
 279 // Undo/redo
 280 void wxTextCtrl::Undo()
 281 {
 282     // Not possible in Motif
 283 }
 284
 285 void wxTextCtrl::Redo()
 286 {
 287     // Not possible in Motif
 288 }
 289
 290 bool wxTextCtrl::CanUndo() const
 291 {
 292     // No Undo in Motif
 293     return FALSE;
 294 }
 295
 296 bool wxTextCtrl::CanRedo() const
 297 {
 298     // No Redo in Motif
 299     return FALSE;
 300 }
 301
 302 // If the return values from and to are the same, there is no
 303 // selection.
 304 void wxTextCtrl::GetSelection(long* from, long* to) const
 305 {
 306     XmTextPosition left, right;
 307
 308     XmTextGetSelectionPosition((Widget) m_mainWidget, & left, & right);
 309
 310     *from = (long) left;
 311     *to = (long) right;
 312 }
 313
 314 bool wxTextCtrl::IsEditable() const
 315 {
 316     return (XmTextGetEditable((Widget) m_mainWidget) != 0);
 317 }
 318
 319 void wxTextCtrl::SetEditable(bool editable)
 320 {
 321     XmTextSetEditable((Widget) m_mainWidget, (Boolean) editable);
 322 }
 323
 324 void wxTextCtrl::SetInsertionPoint(long pos)
 325 {
 326     XmTextSetInsertionPosition ((Widget) m_mainWidget, (XmTextPosition) pos);
 327 }
 328
 329 void wxTextCtrl::SetInsertionPointEnd()
 330 {
 331     long pos = GetLastPosition();
 332     SetInsertionPoint(pos);
 333 }
 334
 335 long wxTextCtrl::GetInsertionPoint() const
 336 {
 337     return (long) XmTextGetInsertionPosition ((Widget) m_mainWidget);
 338 }
 339
 340 long wxTextCtrl::GetLastPosition() const
 341 {
 342     return (long) XmTextGetLastPosition ((Widget) m_mainWidget);
 343 }
 344
 345 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 346 {
 347     XmTextReplace ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 348         (char*) (const char*) value);
 349 }
 350
 351 void wxTextCtrl::Remove(long from, long to)
 352 {
 353     XmTextSetSelection ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 354                       (Time) 0);
 355     XmTextRemove ((Widget) m_mainWidget);
 356 }
 357
 358 void wxTextCtrl::SetSelection(long from, long to)
 359 {
 360     XmTextSetSelection ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 361                       (Time) 0);
 362 }
 363
 364 bool wxTextCtrl::LoadFile(const wxString& file)
 365 {
 366     if (!wxFileExists(file))
 367         return FALSE;
 368
 369     m_fileName = file;
 370
 371     Clear();
 372
 373     Widget textWidget = (Widget) m_mainWidget;
 374     FILE *fp;
 375
 376     struct stat statb;
 377     if ((stat ((char*) (const char*) file, &statb) == -1) || (statb.st_mode & S_IFMT) != S_IFREG ||
 378         !(fp = fopen ((char*) (const char*) file, "r")))
 379     {
 380         return FALSE;
 381     }
 382     else
 383     {
 384         long len = statb.st_size;
 385         char *text;
 386         if (!(text = XtMalloc ((unsigned) (len + 1))))
 387         {
 388             fclose (fp);
 389             return FALSE;
 390         }
 391         if (fread (text, sizeof (char), len, fp) != (size_t) len)
 392         {
 393         }
 394         fclose (fp);
 395
 396         text[len] = 0;
 397         XmTextSetString (textWidget, text);
 398         //      m_textPosition = len;
 399         XtFree (text);
 400         m_modified = FALSE;
 401         return TRUE;
 402     }
 403 }
 404
 405 // If file is null, try saved file name first
 406 // Returns TRUE if succeeds.
 407 bool wxTextCtrl::SaveFile(const wxString& file)
 408 {
 409     wxString theFile(file);
 410     if (theFile == "")
 411         theFile = m_fileName;
 412     if (theFile == "")
 413         return FALSE;
 414     m_fileName = theFile;
 415
 416     Widget textWidget = (Widget) m_mainWidget;
 417     FILE *fp;
 418
 419     if (!(fp = fopen ((char*) (const char*) theFile, "w")))
 420     {
 421         return FALSE;
 422     }
 423     else
 424     {
 425         char *text = XmTextGetString (textWidget);
 426         long len = XmTextGetLastPosition (textWidget);
 427
 428         if (fwrite (text, sizeof (char), len, fp) != (size_t) len)
 429         {
 430             // Did not write whole file
 431         }
 432         // Make sure newline terminates the file
 433         if (text[len - 1] != '\n')
 434             fputc ('\n', fp);
 435
 436         fclose (fp);
 437         XtFree (text);
 438         m_modified = FALSE;
 439         return TRUE;
 440     }
 441 }
 442
 443 void wxTextCtrl::WriteText(const wxString& text)
 444 {
 445     long textPosition = GetInsertionPoint() + strlen (text);
 446     XmTextInsert ((Widget) m_mainWidget, GetInsertionPoint(), (char*) (const char*) text);
 447     XtVaSetValues ((Widget) m_mainWidget, XmNcursorPosition, textPosition, NULL);
 448     SetInsertionPoint(textPosition);
 449     XmTextShowPosition ((Widget) m_mainWidget, textPosition);
 450     m_modified = TRUE;
 451 }
 452
 453 void wxTextCtrl::AppendText(const wxString& text)
 454 {
 455     long textPosition = GetLastPosition() + strlen(text);
 456     XmTextInsert ((Widget) m_mainWidget, GetLastPosition(), (char*) (const char*) text);
 457     XtVaSetValues ((Widget) m_mainWidget, XmNcursorPosition, textPosition, NULL);
 458     SetInsertionPoint(textPosition);
 459     XmTextShowPosition ((Widget) m_mainWidget, textPosition);
 460     m_modified = TRUE;
 461 }
 462
 463 void wxTextCtrl::Clear()
 464 {
 465     XmTextSetString ((Widget) m_mainWidget, "");
 466     m_modified = FALSE;
 467 }
 468
 469 bool wxTextCtrl::IsModified() const
 470 {
 471     return m_modified;
 472 }
 473
 474 // Makes 'unmodified'
 475 void wxTextCtrl::DiscardEdits()
 476 {
 477     m_modified = FALSE;
 478 }
 479
 480 int wxTextCtrl::GetNumberOfLines() const
 481 {
 482     // HIDEOUSLY inefficient, but we have no choice.
 483     char *s = XmTextGetString ((Widget) m_mainWidget);
 484     if (s)
 485     {
 486         long i = 0;
 487         int currentLine = 0;
 488         bool finished = FALSE;
 489         while (!finished)
 490         {
 491             int ch = s[i];
 492             if (ch == '\n')
 493             {
 494                 currentLine++;
 495                 i++;
 496             }
 497             else if (ch == 0)
 498             {
 499                 finished = TRUE;
 500             }
 501             else
 502                 i++;
 503         }
 504
 505         XtFree (s);
 506         return currentLine;
 507     }
 508     return 0;
 509 }
 510
 511 long wxTextCtrl::XYToPosition(long x, long y) const
 512 {
 513 /* It seems, that there is a bug in some versions of the Motif library,
 514     so the original wxWin-Code doesn't work. */
 515     /*
 516     Widget textWidget = (Widget) handle;
 517     return (long) XmTextXYToPos (textWidget, (Position) x, (Position) y);
 518     */
 519     /* Now a little workaround: */
 520     long r=0;
 521     for (int i=0; i<y; i++) r+=(GetLineLength(i)+1);
 522     return r+x;
 523 }
 524
 525 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 526 {
 527     Position xx, yy;
 528     XmTextPosToXY((Widget) m_mainWidget, pos, &xx, &yy);
 529     if ( x )
 530         *x = xx;
 531     if ( y )
 532         *y = yy;
 533
 534     return TRUE;
 535 }
 536
 537 void wxTextCtrl::ShowPosition(long pos)
 538 {
 539     XmTextShowPosition ((Widget) m_mainWidget, (XmTextPosition) pos);
 540 }
 541
 542 int wxTextCtrl::GetLineLength(long lineNo) const
 543 {
 544     wxString str = GetLineText (lineNo);
 545     return (int) str.Length();
 546 }
 547
 548 wxString wxTextCtrl::GetLineText(long lineNo) const
 549 {
 550     // HIDEOUSLY inefficient, but we have no choice.
 551     char *s = XmTextGetString ((Widget) m_mainWidget);
 552
 553     if (s)
 554     {
 555         wxString buf("");
 556         long i;
 557         int currentLine = 0;
 558         for (i = 0; currentLine != lineNo && s[i]; i++ )
 559             if (s[i] == '\n')
 560                 currentLine++;
 561             // Now get the text
 562             int j;
 563             for (j = 0; s[i] && s[i] != '\n'; i++, j++ )
 564                 buf += s[i];
 565
 566             XtFree(s);
 567             return buf;
 568     }
 569     else
 570         return wxEmptyString;
 571 }
 572
 573 /*
 574 * Text item
 575 */
 576
 577 void wxTextCtrl::Command(wxCommandEvent & event)
 578 {
 579     SetValue (event.GetString());
 580     ProcessCommand (event);
 581 }
 582
 583 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 584 {
 585     // By default, load the first file into the text window.
 586     if (event.GetNumberOfFiles() > 0)
 587     {
 588         LoadFile(event.GetFiles()[0]);
 589     }
 590 }
 591
 592 void wxTextCtrl::OnChar(wxKeyEvent& event)
 593 {
 594     // Indicates that we should generate a normal command, because
 595     // we're letting default behaviour happen (otherwise it's vetoed
 596     // by virtue of overriding OnChar)
 597     m_processedDefault = TRUE;
 598
 599     if (m_tempCallbackStruct)
 600     {
 601         XmTextVerifyCallbackStruct *textStruct =
 602             (XmTextVerifyCallbackStruct *) m_tempCallbackStruct;
 603         textStruct->doit = True;
 604         if (isascii(event.m_keyCode) && (textStruct->text->length == 1))
 605         {
 606             textStruct->text->ptr[0] = ((event.m_keyCode == WXK_RETURN) ? 10 : event.m_keyCode);
 607         }
 608     }
 609 }
 610
 611 void wxTextCtrl::ChangeFont(bool keepOriginalSize)
 612 {
 613     wxWindow::ChangeFont(keepOriginalSize);
 614 }
 615
 616 void wxTextCtrl::ChangeBackgroundColour()
 617 {
 618     wxWindow::ChangeBackgroundColour();
 619
 620     /* TODO: should scrollbars be affected? Should probably have separate
 621     * function to change them (by default, taken from wxSystemSettings)
 622     */
 623     if (m_windowStyle & wxTE_MULTILINE)
 624     {
 625         Widget parent = XtParent ((Widget) m_mainWidget);
 626         Widget hsb, vsb;
 627
 628         XtVaGetValues (parent,
 629             XmNhorizontalScrollBar, &hsb,
 630             XmNverticalScrollBar, &vsb,
 631             NULL);
 632         wxColour backgroundColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
 633         if (hsb)
 634             DoChangeBackgroundColour((WXWidget) hsb, backgroundColour, TRUE);
 635         if (vsb)
 636             DoChangeBackgroundColour((WXWidget) vsb, backgroundColour, TRUE);
 637
 638         DoChangeBackgroundColour((WXWidget) parent, m_backgroundColour, TRUE);
 639     }
 640 }
 641
 642 void wxTextCtrl::ChangeForegroundColour()
 643 {
 644     wxWindow::ChangeForegroundColour();
 645
 646     if (m_windowStyle & wxTE_MULTILINE)
 647     {
 648         Widget parent = XtParent ((Widget) m_mainWidget);
 649         Widget hsb, vsb;
 650
 651         XtVaGetValues (parent,
 652             XmNhorizontalScrollBar, &hsb,
 653             XmNverticalScrollBar, &vsb,
 654             NULL);
 655
 656             /* TODO: should scrollbars be affected? Should probably have separate
 657             * function to change them (by default, taken from wxSystemSettings)
 658             if (hsb)
 659             DoChangeForegroundColour((WXWidget) hsb, m_foregroundColour);
 660             if (vsb)
 661             DoChangeForegroundColour((WXWidget) vsb, m_foregroundColour);
 662         */
 663         DoChangeForegroundColour((WXWidget) parent, m_foregroundColour);
 664     }
 665 }
 666
 667 void wxTextCtrl::DoSendEvents(void *wxcbs, long keycode)
 668 {
 669     // we're in process of updating the text control
 670     m_tempCallbackStruct = wxcbs;
 671
 672     XmTextVerifyCallbackStruct *cbs = (XmTextVerifyCallbackStruct *)wxcbs;
 673
 674     wxKeyEvent event (wxEVT_CHAR);
 675     event.SetId(GetId());
 676     event.m_keyCode = keycode;
 677     event.SetEventObject(this);
 678
 679     // Only if wxTextCtrl::OnChar is called will this be set to True (and
 680     // the character passed through)
 681     cbs->doit = False;
 682
 683     GetEventHandler()->ProcessEvent(event);
 684
 685     if ( !InSetValue() && m_processedDefault )
 686     {
 687         // Can generate a command
 688         wxCommandEvent commandEvent(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 689         commandEvent.SetEventObject(this);
 690         ProcessCommand(commandEvent);
 691     }
 692
 693     // do it after the (user) event handlers processed the events because
 694     // otherwise GetValue() would return incorrect (not yet updated value)
 695     m_tempCallbackStruct = NULL;
 696 }
 697
 698 // ----------------------------------------------------------------------------
 699 // helpers and Motif callbacks
 700 // ----------------------------------------------------------------------------
 701
 702 static void MergeChangesIntoString(wxString& value,
 703                                    XmTextVerifyCallbackStruct *cbs)
 704 {
 705     /* _sm_
 706      * At least on my system (SunOS 4.1.3 + Motif 1.2), you need to think of
 707      * every event as a replace event.  cbs->text->ptr gives the replacement
 708      * text, cbs->startPos gives the index of the first char affected by the
 709      * replace, and cbs->endPos gives the index one more than the last char
 710      * affected by the replace (startPos == endPos implies an empty range).
 711      * Hence, a deletion is represented by replacing all input text with a
 712      * blank string ("", *not* NULL!).  A simple insertion that does not
 713      * overwrite any text has startPos == endPos.
 714      */
 715
 716     if ( !value )
 717     {
 718         // easy case: the ol value was empty
 719         value = cbs->text->ptr;
 720     }
 721     else
 722     {
 723         // merge the changes into the value
 724         const char * const passwd = value;
 725         int len = value.length();
 726
 727         len += strlen(cbs->text->ptr) + 1;     // + new text (if any) + NUL
 728         len -= cbs->endPos - cbs->startPos;    // - text from affected region.
 729
 730         char * newS = new char [len];
 731         char * dest = newS,
 732              * insert = cbs->text->ptr;
 733
 734         // Copy (old) text from passwd, up to the start posn of the change.
 735         int i;
 736         const char * p = passwd;
 737         for (i = 0; i < cbs->startPos; ++i)
 738             *dest++ = *p++;
 739
 740         // Copy the text to be inserted).
 741         while (*insert)
 742             *dest++ = *insert++;
 743
 744         // Finally, copy into newS any remaining text from passwd[endPos] on.
 745         for (p = passwd + cbs->endPos; *p; )
 746             *dest++ = *p++;
 747         *dest = 0;
 748
 749         value = newS;
 750
 751         delete[] newS;
 752     }
 753 }
 754
 755 static void
 756 wxTextWindowChangedProc (Widget w, XtPointer clientData, XtPointer ptr)
 757 {
 758     if (!wxGetWindowFromTable(w))
 759         // Widget has been deleted!
 760         return;
 761
 762     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 763     tw->SetModified(TRUE);
 764 }
 765
 766 static void
 767 wxTextWindowModifyProc (Widget w, XtPointer clientData, XmTextVerifyCallbackStruct *cbs)
 768 {
 769     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 770     tw->m_processedDefault = FALSE;
 771
 772     // First, do some stuff if it's a password control: in this case, we need
 773     // to store the string inside the class because GetValue() can't retrieve
 774     // it from the text ctrl. We do *not* do it in other circumstances because
 775     // it would double the amount of memory needed.
 776
 777     if ( tw->GetWindowStyleFlag() & wxTE_PASSWORD )
 778     {
 779         MergeChangesIntoString(tw->m_value, cbs);
 780
 781         if ( cbs->text->length > 0 )
 782         {
 783             int i;
 784             for (i = 0; i < cbs->text->length; ++i)
 785                 cbs->text->ptr[i] = '*';
 786             cbs->text->ptr[i] = '\0';
 787         }
 788     }
 789
 790     // If we're already within an OnChar, return: probably a programmatic
 791     // insertion.
 792     if (tw->m_tempCallbackStruct)
 793         return;
 794
 795     // Check for a backspace
 796     if (cbs->startPos == (cbs->currInsert - 1))
 797     {
 798         tw->DoSendEvents((void *)cbs, WXK_DELETE);
 799
 800         return;
 801     }
 802
 803     // Pasting operation: let it through without calling OnChar
 804     if (cbs->text->length > 1)
 805         return;
 806
 807     // Something other than text
 808     if (cbs->text->ptr == NULL)
 809         return;
 810
 811     // normal key press
 812     char ch = cbs->text->ptr[0];
 813     tw->DoSendEvents((void *)cbs, ch == '\n' ? '\r' : ch);
 814 }
 815
 816 static void
 817 wxTextWindowGainFocusProc (Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs)
 818 {
 819     if (!wxGetWindowFromTable(w))
 820         return;
 821
 822     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 823     wxFocusEvent event(wxEVT_SET_FOCUS, tw->GetId());
 824     event.SetEventObject(tw);
 825     tw->GetEventHandler()->ProcessEvent(event);
 826 }
 827
 828 static void
 829 wxTextWindowLoseFocusProc (Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs)
 830 {
 831     if (!wxGetWindowFromTable(w))
 832         return;
 833
 834     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 835     wxFocusEvent event(wxEVT_KILL_FOCUS, tw->GetId());
 836     event.SetEventObject(tw);
 837     tw->GetEventHandler()->ProcessEvent(event);
 838 }
 839
 840 static void wxTextWindowActivateProc(Widget w, XtPointer clientData,
 841                                      XmAnyCallbackStruct *ptr)
 842 {
 843     if (!wxGetWindowFromTable(w))
 844         return;
 845
 846     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 847
 848     if (tw->InSetValue())
 849         return;
 850
 851     wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER);
 852     event.SetId(tw->GetId());
 853     event.SetEventObject(tw);
 854     tw->ProcessCommand(event);
 855 }
 856
 857 void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
 858 {
 859     Cut();
 860 }
 861
 862 void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
 863 {
 864     Copy();
 865 }
 866
 867 void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
 868 {
 869     Paste();
 870 }
 871
 872 void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
 873 {
 874     Undo();
 875 }
 876
 877 void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
 878 {
 879     Redo();
 880 }
 881
 882 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
 883 {
 884     event.Enable( CanCut() );
 885 }
 886
 887 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
 888 {
 889     event.Enable( CanCopy() );
 890 }
 891
 892 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
 893 {
 894     event.Enable( CanPaste() );
 895 }
 896
 897 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
 898 {
 899     event.Enable( CanUndo() );
 900 }
 901
 902 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
 903 {
 904     event.Enable( CanRedo() );
 905 }