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 #ifdef __VMS
  25 #define XtParent XTPARENT
  26 #endif
  27
  28 #include "wx/defs.h"
  29
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <ctype.h>
  33
  34 #include "wx/textctrl.h"
  35 #include "wx/settings.h"
  36 #include "wx/filefn.h"
  37 #include "wx/utils.h"
  38
  39 #ifdef __VMS__
  40 #pragma message disable nosimpint
  41 #endif
  42 #include <Xm/Text.h>
  43 #ifdef __VMS__
  44 #pragma message enable nosimpint
  45 #endif
  46
  47 #include "wx/motif/private.h"
  48
  49 // ----------------------------------------------------------------------------
  50 // private functions
  51 // ----------------------------------------------------------------------------
  52
  53 // helper: inserts the new text in the value of the text ctrl and returns the
  54 // result in place
  55 static void MergeChangesIntoString(wxString& value,
  56                                    XmTextVerifyCallbackStruct *textStruct);
  57
  58 // callbacks
  59 static void wxTextWindowChangedProc(Widget w, XtPointer clientData, XtPointer ptr);
  60 static void wxTextWindowModifyProc(Widget w, XtPointer clientData, XmTextVerifyCallbackStruct *cbs);
  61 static void wxTextWindowGainFocusProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs);
  62 static void wxTextWindowLoseFocusProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs);
  63 static void wxTextWindowActivateProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *ptr);
  64
  65     IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  66
  67     BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  68         EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  69         EVT_CHAR(wxTextCtrl::OnChar)
  70
  71     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
  72     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
  73     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
  74     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
  75     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
  76
  77     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
  78     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
  79     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
  80     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
  81     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
  82
  83     END_EVENT_TABLE()
  84
  85 // ============================================================================
  86 // implementation
  87 // ============================================================================
  88
  89 // ----------------------------------------------------------------------------
  90 // wxTextCtrl
  91 // ----------------------------------------------------------------------------
  92
  93 // Text item
  94 wxTextCtrl::wxTextCtrl()
  95 {
  96     m_tempCallbackStruct = (void*) NULL;
  97     m_modified = FALSE;
  98     m_processedDefault = FALSE;
  99 }
 100
 101 bool wxTextCtrl::Create(wxWindow *parent,
 102                         wxWindowID id,
 103                         const wxString& value,
 104                         const wxPoint& pos,
 105                         const wxSize& size,
 106                         long style,
 107                         const wxValidator& validator,
 108                         const wxString& name)
 109 {
 110     if( !CreateControl( parent, id, pos, size, style, validator, name ) )
 111         return false;
 112
 113     m_tempCallbackStruct = (void*) NULL;
 114     m_modified = FALSE;
 115     m_processedDefault = FALSE;
 116
 117     m_backgroundColour = *wxWHITE;
 118
 119     Widget parentWidget = (Widget) parent->GetClientWidget();
 120
 121     bool wantHorizScrolling = ((m_windowStyle & wxHSCROLL) != 0);
 122
 123     // If we don't have horizontal scrollbars, we want word wrap.
 124     bool wantWordWrap = !wantHorizScrolling;
 125
 126     if (m_windowStyle & wxTE_MULTILINE)
 127     {
 128         Arg args[2];
 129         XtSetArg (args[0], XmNscrollHorizontal, wantHorizScrolling ? True : False);
 130         XtSetArg (args[1], XmNwordWrap, wantWordWrap ? True : False);
 131
 132         m_mainWidget = (WXWidget) XmCreateScrolledText(parentWidget,
 133                                                        wxConstCast(name.c_str(), char),
 134                                                        args, 2);
 135
 136         XtVaSetValues ((Widget) m_mainWidget,
 137                         XmNeditable, ((style & wxTE_READONLY) ? False : True),
 138                         XmNeditMode, XmMULTI_LINE_EDIT,
 139                         NULL);
 140         XtManageChild ((Widget) m_mainWidget);
 141     }
 142     else
 143     {
 144         m_mainWidget = (WXWidget)XtVaCreateManagedWidget
 145                                  (
 146                                   wxConstCast(name.c_str(), char),
 147                                   xmTextWidgetClass,
 148                                   parentWidget,
 149                                   NULL
 150                                  );
 151
 152         XtVaSetValues ((Widget) m_mainWidget,
 153                         XmNeditable, ((style & wxTE_READONLY) ? False : True),
 154                         NULL);
 155
 156         // TODO: Is this relevant? What does it do?
 157         int noCols = 2;
 158         if (!value.IsNull() && (value.Length() > (unsigned int) noCols))
 159             noCols = value.Length();
 160         XtVaSetValues((Widget) m_mainWidget,
 161                       XmNcolumns, noCols,
 162                       NULL);
 163     }
 164
 165     // remove border if asked for
 166     if ( style & wxNO_BORDER )
 167     {
 168         XtVaSetValues((Widget)m_mainWidget,
 169                       XmNshadowThickness, 0,
 170                       NULL);
 171     }
 172
 173     if ( !value.empty() )
 174     {
 175         // do this instead... MB
 176         //
 177         XtVaSetValues( (Widget) m_mainWidget,
 178                        XmNvalue, wxConstCast(value.c_str(), char),
 179                        NULL);
 180     }
 181
 182     // install callbacks
 183     XtAddCallback((Widget) m_mainWidget, XmNvalueChangedCallback, (XtCallbackProc)wxTextWindowChangedProc, (XtPointer)this);
 184
 185     XtAddCallback((Widget) m_mainWidget, XmNmodifyVerifyCallback, (XtCallbackProc)wxTextWindowModifyProc, (XtPointer)this);
 186
 187     XtAddCallback((Widget) m_mainWidget, XmNactivateCallback, (XtCallbackProc)wxTextWindowActivateProc, (XtPointer)this);
 188
 189     XtAddCallback((Widget) m_mainWidget, XmNfocusCallback, (XtCallbackProc)wxTextWindowGainFocusProc, (XtPointer)this);
 190
 191     XtAddCallback((Widget) m_mainWidget, XmNlosingFocusCallback, (XtCallbackProc)wxTextWindowLoseFocusProc, (XtPointer)this);
 192
 193     // font
 194     ChangeFont(FALSE);
 195
 196     wxSize best = GetBestSize();
 197     if( size.x != -1 ) best.x = size.x;
 198     if( size.y != -1 ) best.y = size.y;
 199
 200     SetCanAddEventHandler(TRUE);
 201     AttachWidget (parent, m_mainWidget, (WXWidget) NULL,
 202                   pos.x, pos.y, best.x, best.y);
 203
 204     ChangeBackgroundColour();
 205
 206     return TRUE;
 207 }
 208
 209 WXWidget wxTextCtrl::GetTopWidget() const
 210 {
 211     return IsMultiLine() ? (WXWidget)XtParent((Widget)m_mainWidget)
 212                          : m_mainWidget;
 213 }
 214
 215 wxString wxTextCtrl::GetValue() const
 216 {
 217     wxString str; // result
 218
 219     if (m_windowStyle & wxTE_PASSWORD)
 220     {
 221         // the value is stored always in m_value because it can't be retrieved
 222         // from the text control
 223         str = m_value;
 224     }
 225     else
 226     {
 227         // just get the string from Motif
 228         char *s = XmTextGetString ((Widget) m_mainWidget);
 229         if ( s )
 230         {
 231             str = s;
 232             XtFree (s);
 233         }
 234         //else: return empty string
 235
 236         if ( m_tempCallbackStruct )
 237         {
 238             // the string in the control isn't yet updated, can't use it as is
 239             MergeChangesIntoString(str, (XmTextVerifyCallbackStruct *)
 240                                    m_tempCallbackStruct);
 241         }
 242     }
 243
 244     return str;
 245 }
 246
 247 void wxTextCtrl::SetValue(const wxString& value)
 248 {
 249     m_inSetValue = TRUE;
 250
 251     // do this instead... MB
 252     //
 253     // with (at least) OpenMotif 2.1 this causes a lot of flicker
 254 #if 0
 255     XtVaSetValues( (Widget) m_mainWidget,
 256                    XmNvalue, wxConstCast(value.c_str(), char),
 257                    NULL);
 258 #endif
 259
 260     Clear();
 261     AppendText( value );
 262
 263     m_inSetValue = FALSE;
 264 }
 265
 266 // Clipboard operations
 267 void wxTextCtrl::Copy()
 268 {
 269     XmTextCopy((Widget) m_mainWidget, CurrentTime);
 270 }
 271
 272 void wxTextCtrl::Cut()
 273 {
 274     XmTextCut((Widget) m_mainWidget, CurrentTime);
 275 }
 276
 277 void wxTextCtrl::Paste()
 278 {
 279     XmTextPaste((Widget) m_mainWidget);
 280 }
 281
 282 bool wxTextCtrl::CanCopy() const
 283 {
 284     // Can copy if there's a selection
 285     long from, to;
 286     GetSelection(& from, & to);
 287     return (from != to) ;
 288 }
 289
 290 bool wxTextCtrl::CanCut() const
 291 {
 292     // Can cut if there's a selection
 293     long from, to;
 294     GetSelection(& from, & to);
 295     return (from != to) && (IsEditable());
 296 }
 297
 298 bool wxTextCtrl::CanPaste() const
 299 {
 300     return IsEditable() ;
 301 }
 302
 303 // Undo/redo
 304 void wxTextCtrl::Undo()
 305 {
 306     // Not possible in Motif
 307 }
 308
 309 void wxTextCtrl::Redo()
 310 {
 311     // Not possible in Motif
 312 }
 313
 314 bool wxTextCtrl::CanUndo() const
 315 {
 316     // No Undo in Motif
 317     return FALSE;
 318 }
 319
 320 bool wxTextCtrl::CanRedo() const
 321 {
 322     // No Redo in Motif
 323     return FALSE;
 324 }
 325
 326 // If the return values from and to are the same, there is no
 327 // selection.
 328 void wxTextCtrl::GetSelection(long* from, long* to) const
 329 {
 330     XmTextPosition left, right;
 331
 332     XmTextGetSelectionPosition((Widget) m_mainWidget, & left, & right);
 333
 334     *from = (long) left;
 335     *to = (long) right;
 336 }
 337
 338 bool wxTextCtrl::IsEditable() const
 339 {
 340     return (XmTextGetEditable((Widget) m_mainWidget) != 0);
 341 }
 342
 343 void wxTextCtrl::SetEditable(bool editable)
 344 {
 345     XmTextSetEditable((Widget) m_mainWidget, (Boolean) editable);
 346 }
 347
 348 void wxTextCtrl::SetInsertionPoint(long pos)
 349 {
 350     XmTextSetInsertionPosition ((Widget) m_mainWidget, (XmTextPosition) pos);
 351 }
 352
 353 void wxTextCtrl::SetInsertionPointEnd()
 354 {
 355     long pos = GetLastPosition();
 356     SetInsertionPoint(pos);
 357 }
 358
 359 long wxTextCtrl::GetInsertionPoint() const
 360 {
 361     return (long) XmTextGetInsertionPosition ((Widget) m_mainWidget);
 362 }
 363
 364 long wxTextCtrl::GetLastPosition() const
 365 {
 366     return (long) XmTextGetLastPosition ((Widget) m_mainWidget);
 367 }
 368
 369 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 370 {
 371     XmTextReplace ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 372         wxConstCast(value.c_str(), char));
 373 }
 374
 375 void wxTextCtrl::Remove(long from, long to)
 376 {
 377     XmTextSetSelection ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 378                       (Time) 0);
 379     XmTextRemove ((Widget) m_mainWidget);
 380 }
 381
 382 void wxTextCtrl::SetSelection(long from, long to)
 383 {
 384     if( to == -1 )
 385         to = GetLastPosition();
 386
 387     XmTextSetSelection ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 388                       (Time) 0);
 389 }
 390
 391 void wxTextCtrl::WriteText(const wxString& text)
 392 {
 393     long textPosition = GetInsertionPoint() + strlen (text);
 394     XmTextInsert ((Widget) m_mainWidget, GetInsertionPoint(),
 395                   wxConstCast(text.c_str(), char));
 396     XtVaSetValues ((Widget) m_mainWidget, XmNcursorPosition, textPosition, NULL);
 397     SetInsertionPoint(textPosition);
 398     XmTextShowPosition ((Widget) m_mainWidget, textPosition);
 399     m_modified = TRUE;
 400 }
 401
 402 void wxTextCtrl::AppendText(const wxString& text)
 403 {
 404     long textPosition = GetLastPosition() + text.length();
 405     XmTextInsert ((Widget) m_mainWidget, GetLastPosition(),
 406                   wxConstCast(text.c_str(), char));
 407     XtVaSetValues ((Widget) m_mainWidget, XmNcursorPosition, textPosition, NULL);
 408     SetInsertionPoint(textPosition);
 409     XmTextShowPosition ((Widget) m_mainWidget, textPosition);
 410     m_modified = TRUE;
 411 }
 412
 413 void wxTextCtrl::Clear()
 414 {
 415     XmTextSetString ((Widget) m_mainWidget, "");
 416     m_modified = FALSE;
 417 }
 418
 419 bool wxTextCtrl::IsModified() const
 420 {
 421     return m_modified;
 422 }
 423
 424 // Makes 'unmodified'
 425 void wxTextCtrl::DiscardEdits()
 426 {
 427     m_modified = FALSE;
 428 }
 429
 430 int wxTextCtrl::GetNumberOfLines() const
 431 {
 432     // HIDEOUSLY inefficient, but we have no choice.
 433     char *s = XmTextGetString ((Widget) m_mainWidget);
 434     if (s)
 435     {
 436         long i = 0;
 437         int currentLine = 0;
 438         bool finished = FALSE;
 439         while (!finished)
 440         {
 441             int ch = s[i];
 442             if (ch == '\n')
 443             {
 444                 currentLine++;
 445                 i++;
 446             }
 447             else if (ch == 0)
 448             {
 449                 finished = TRUE;
 450             }
 451             else
 452                 i++;
 453         }
 454
 455         XtFree (s);
 456         return currentLine;
 457     }
 458     return 0;
 459 }
 460
 461 long wxTextCtrl::XYToPosition(long x, long y) const
 462 {
 463 /* It seems, that there is a bug in some versions of the Motif library,
 464     so the original wxWin-Code doesn't work. */
 465     /*
 466     Widget textWidget = (Widget) handle;
 467     return (long) XmTextXYToPos (textWidget, (Position) x, (Position) y);
 468     */
 469     /* Now a little workaround: */
 470     long r=0;
 471     for (int i=0; i<y; i++) r+=(GetLineLength(i)+1);
 472     return r+x;
 473 }
 474
 475 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 476 {
 477     Position xx, yy;
 478     XmTextPosToXY((Widget) m_mainWidget, pos, &xx, &yy);
 479     if ( x )
 480         *x = xx;
 481     if ( y )
 482         *y = yy;
 483
 484     return TRUE;
 485 }
 486
 487 void wxTextCtrl::ShowPosition(long pos)
 488 {
 489     XmTextShowPosition ((Widget) m_mainWidget, (XmTextPosition) pos);
 490 }
 491
 492 int wxTextCtrl::GetLineLength(long lineNo) const
 493 {
 494     wxString str = GetLineText (lineNo);
 495     return (int) str.Length();
 496 }
 497
 498 wxString wxTextCtrl::GetLineText(long lineNo) const
 499 {
 500     // HIDEOUSLY inefficient, but we have no choice.
 501     char *s = XmTextGetString ((Widget) m_mainWidget);
 502
 503     if (s)
 504     {
 505         wxString buf("");
 506         long i;
 507         int currentLine = 0;
 508         for (i = 0; currentLine != lineNo && s[i]; i++ )
 509             if (s[i] == '\n')
 510                 currentLine++;
 511             // Now get the text
 512             int j;
 513             for (j = 0; s[i] && s[i] != '\n'; i++, j++ )
 514                 buf += s[i];
 515
 516             XtFree(s);
 517             return buf;
 518     }
 519     else
 520         return wxEmptyString;
 521 }
 522
 523 /*
 524 * Text item
 525 */
 526
 527 void wxTextCtrl::Command(wxCommandEvent & event)
 528 {
 529     SetValue (event.GetString());
 530     ProcessCommand (event);
 531 }
 532
 533 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 534 {
 535     // By default, load the first file into the text window.
 536     if (event.GetNumberOfFiles() > 0)
 537     {
 538         LoadFile(event.GetFiles()[0]);
 539     }
 540 }
 541
 542 void wxTextCtrl::OnChar(wxKeyEvent& event)
 543 {
 544     // Indicates that we should generate a normal command, because
 545     // we're letting default behaviour happen (otherwise it's vetoed
 546     // by virtue of overriding OnChar)
 547     m_processedDefault = TRUE;
 548
 549     if (m_tempCallbackStruct)
 550     {
 551         XmTextVerifyCallbackStruct *textStruct =
 552             (XmTextVerifyCallbackStruct *) m_tempCallbackStruct;
 553         textStruct->doit = True;
 554         if (isascii(event.m_keyCode) && (textStruct->text->length == 1))
 555         {
 556             textStruct->text->ptr[0] = ((event.m_keyCode == WXK_RETURN) ? 10 : event.m_keyCode);
 557         }
 558     }
 559 }
 560
 561 void wxTextCtrl::ChangeFont(bool keepOriginalSize)
 562 {
 563     wxWindow::ChangeFont(keepOriginalSize);
 564 }
 565
 566 void wxTextCtrl::ChangeBackgroundColour()
 567 {
 568     wxWindow::ChangeBackgroundColour();
 569
 570     /* TODO: should scrollbars be affected? Should probably have separate
 571     * function to change them (by default, taken from wxSystemSettings)
 572     */
 573     if (m_windowStyle & wxTE_MULTILINE)
 574     {
 575         Widget parent = XtParent ((Widget) m_mainWidget);
 576         Widget hsb, vsb;
 577
 578         XtVaGetValues (parent,
 579             XmNhorizontalScrollBar, &hsb,
 580             XmNverticalScrollBar, &vsb,
 581             NULL);
 582         wxColour backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 583         if (hsb)
 584             DoChangeBackgroundColour((WXWidget) hsb, backgroundColour, TRUE);
 585         if (vsb)
 586             DoChangeBackgroundColour((WXWidget) vsb, backgroundColour, TRUE);
 587
 588         // MBN: why change parent background?
 589         // DoChangeBackgroundColour((WXWidget) parent, m_backgroundColour, TRUE);
 590     }
 591 }
 592
 593 void wxTextCtrl::ChangeForegroundColour()
 594 {
 595     wxWindow::ChangeForegroundColour();
 596
 597     if (m_windowStyle & wxTE_MULTILINE)
 598     {
 599         Widget parent = XtParent ((Widget) m_mainWidget);
 600         Widget hsb, vsb;
 601
 602         XtVaGetValues (parent,
 603             XmNhorizontalScrollBar, &hsb,
 604             XmNverticalScrollBar, &vsb,
 605             NULL);
 606
 607             /* TODO: should scrollbars be affected? Should probably have separate
 608             * function to change them (by default, taken from wxSystemSettings)
 609             if (hsb)
 610             DoChangeForegroundColour((WXWidget) hsb, m_foregroundColour);
 611             if (vsb)
 612             DoChangeForegroundColour((WXWidget) vsb, m_foregroundColour);
 613         */
 614         DoChangeForegroundColour((WXWidget) parent, m_foregroundColour);
 615     }
 616 }
 617
 618 void wxTextCtrl::DoSendEvents(void *wxcbs, long keycode)
 619 {
 620     // we're in process of updating the text control
 621     m_tempCallbackStruct = wxcbs;
 622
 623     XmTextVerifyCallbackStruct *cbs = (XmTextVerifyCallbackStruct *)wxcbs;
 624
 625     wxKeyEvent event (wxEVT_CHAR);
 626     event.SetId(GetId());
 627     event.m_keyCode = keycode;
 628     event.SetEventObject(this);
 629
 630     // Only if wxTextCtrl::OnChar is called will this be set to True (and
 631     // the character passed through)
 632     cbs->doit = False;
 633
 634     GetEventHandler()->ProcessEvent(event);
 635
 636     if ( !InSetValue() && m_processedDefault )
 637     {
 638         // Can generate a command
 639         wxCommandEvent commandEvent(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 640         commandEvent.SetEventObject(this);
 641         ProcessCommand(commandEvent);
 642     }
 643
 644     // do it after the (user) event handlers processed the events because
 645     // otherwise GetValue() would return incorrect (not yet updated value)
 646     m_tempCallbackStruct = NULL;
 647 }
 648
 649 wxSize wxDoGetSingleTextCtrlBestSize( Widget textWidget,
 650                                       const wxWindow* window )
 651 {
 652     Dimension xmargin, ymargin, highlight, shadow;
 653     char* value;
 654
 655     XtVaGetValues( textWidget,
 656                    XmNmarginWidth, &xmargin,
 657                    XmNmarginHeight, &ymargin,
 658                    XmNvalue, &value,
 659                    XmNhighlightThickness, &highlight,
 660                    XmNshadowThickness, &shadow,
 661                    NULL );
 662
 663     if( !value )
 664         value = "|";
 665
 666     int x, y;
 667     window->GetTextExtent( value, &x, &y );
 668
 669     if( x < 100 ) x = 100;
 670
 671     return wxSize( x + 2 * xmargin + 2 * highlight + 2 * shadow,
 672                    // MBN: +2 necessary: Lesstif bug or mine?
 673                    y + 2 * ymargin + 2 * highlight + 2 * shadow + 2 );
 674 }
 675
 676 wxSize wxTextCtrl::DoGetBestSize() const
 677 {
 678     if( IsSingleLine() )
 679         return wxDoGetSingleTextCtrlBestSize( (Widget)m_mainWidget, this );
 680     else
 681         return wxWindow::DoGetBestSize();
 682 }
 683
 684 // ----------------------------------------------------------------------------
 685 // helpers and Motif callbacks
 686 // ----------------------------------------------------------------------------
 687
 688 static void MergeChangesIntoString(wxString& value,
 689                                    XmTextVerifyCallbackStruct *cbs)
 690 {
 691     /* _sm_
 692      * At least on my system (SunOS 4.1.3 + Motif 1.2), you need to think of
 693      * every event as a replace event.  cbs->text->ptr gives the replacement
 694      * text, cbs->startPos gives the index of the first char affected by the
 695      * replace, and cbs->endPos gives the index one more than the last char
 696      * affected by the replace (startPos == endPos implies an empty range).
 697      * Hence, a deletion is represented by replacing all input text with a
 698      * blank string ("", *not* NULL!).  A simple insertion that does not
 699      * overwrite any text has startPos == endPos.
 700      */
 701
 702     if ( !value )
 703     {
 704         // easy case: the ol value was empty
 705         value = cbs->text->ptr;
 706     }
 707     else
 708     {
 709         // merge the changes into the value
 710         const char * const passwd = value;
 711         int len = value.length();
 712
 713         len += ( cbs->text->ptr ?
 714                  strlen(cbs->text->ptr) :
 715                  0 ) + 1;                      // + new text (if any) + NUL
 716         len -= cbs->endPos - cbs->startPos;    // - text from affected region.
 717
 718         char * newS = new char [len];
 719         char * dest = newS,
 720              * insert = cbs->text->ptr;
 721
 722         // Copy (old) text from passwd, up to the start posn of the change.
 723         int i;
 724         const char * p = passwd;
 725         for (i = 0; i < cbs->startPos; ++i)
 726             *dest++ = *p++;
 727
 728         // Copy the text to be inserted).
 729         if (insert)
 730             while (*insert)
 731                 *dest++ = *insert++;
 732
 733         // Finally, copy into newS any remaining text from passwd[endPos] on.
 734         for (p = passwd + cbs->endPos; *p; )
 735             *dest++ = *p++;
 736         *dest = 0;
 737
 738         value = newS;
 739
 740         delete[] newS;
 741     }
 742 }
 743
 744 static void
 745 wxTextWindowChangedProc (Widget w, XtPointer clientData, XtPointer WXUNUSED(ptr))
 746 {
 747     if (!wxGetWindowFromTable(w))
 748         // Widget has been deleted!
 749         return;
 750
 751     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 752     tw->SetModified(TRUE);
 753 }
 754
 755 static void
 756 wxTextWindowModifyProc (Widget WXUNUSED(w), XtPointer clientData, XmTextVerifyCallbackStruct *cbs)
 757 {
 758     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 759     tw->m_processedDefault = FALSE;
 760
 761     // First, do some stuff if it's a password control: in this case, we need
 762     // to store the string inside the class because GetValue() can't retrieve
 763     // it from the text ctrl. We do *not* do it in other circumstances because
 764     // it would double the amount of memory needed.
 765
 766     if ( tw->GetWindowStyleFlag() & wxTE_PASSWORD )
 767     {
 768         MergeChangesIntoString(tw->m_value, cbs);
 769
 770         if ( cbs->text->length > 0 )
 771         {
 772             int i;
 773             for (i = 0; i < cbs->text->length; ++i)
 774                 cbs->text->ptr[i] = '*';
 775             cbs->text->ptr[i] = '\0';
 776         }
 777     }
 778
 779     if(tw->InSetValue())
 780         return;
 781
 782     // If we're already within an OnChar, return: probably a programmatic
 783     // insertion.
 784     if (tw->m_tempCallbackStruct)
 785         return;
 786
 787     // Check for a backspace
 788     if (cbs->startPos == (cbs->currInsert - 1))
 789     {
 790         tw->DoSendEvents((void *)cbs, WXK_DELETE);
 791
 792         return;
 793     }
 794
 795     // Pasting operation: let it through without calling OnChar
 796     if (cbs->text->length > 1)
 797         return;
 798
 799     // Something other than text
 800     if (cbs->text->ptr == NULL)
 801         return;
 802
 803     // normal key press
 804     char ch = cbs->text->ptr[0];
 805     tw->DoSendEvents((void *)cbs, ch == '\n' ? '\r' : ch);
 806 }
 807
 808 static void
 809 wxTextWindowGainFocusProc (Widget w, XtPointer clientData, XmAnyCallbackStruct *WXUNUSED(cbs))
 810 {
 811     if (!wxGetWindowFromTable(w))
 812         return;
 813
 814     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 815     wxFocusEvent event(wxEVT_SET_FOCUS, tw->GetId());
 816     event.SetEventObject(tw);
 817     tw->GetEventHandler()->ProcessEvent(event);
 818 }
 819
 820 static void
 821 wxTextWindowLoseFocusProc (Widget w, XtPointer clientData, XmAnyCallbackStruct *WXUNUSED(cbs))
 822 {
 823     if (!wxGetWindowFromTable(w))
 824         return;
 825
 826     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 827     wxFocusEvent event(wxEVT_KILL_FOCUS, tw->GetId());
 828     event.SetEventObject(tw);
 829     tw->GetEventHandler()->ProcessEvent(event);
 830 }
 831
 832 static void wxTextWindowActivateProc(Widget w, XtPointer clientData,
 833                                      XmAnyCallbackStruct *WXUNUSED(ptr))
 834 {
 835     if (!wxGetWindowFromTable(w))
 836         return;
 837
 838     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 839
 840     if (tw->InSetValue())
 841         return;
 842
 843     wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER);
 844     event.SetId(tw->GetId());
 845     event.SetEventObject(tw);
 846     tw->ProcessCommand(event);
 847 }
 848
 849 void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
 850 {
 851     Cut();
 852 }
 853
 854 void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
 855 {
 856     Copy();
 857 }
 858
 859 void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
 860 {
 861     Paste();
 862 }
 863
 864 void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
 865 {
 866     Undo();
 867 }
 868
 869 void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
 870 {
 871     Redo();
 872 }
 873
 874 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
 875 {
 876     event.Enable( CanCut() );
 877 }
 878
 879 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
 880 {
 881     event.Enable( CanCopy() );
 882 }
 883
 884 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
 885 {
 886     event.Enable( CanPaste() );
 887 }
 888
 889 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
 890 {
 891     event.Enable( CanUndo() );
 892 }
 893
 894 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
 895 {
 896     event.Enable( CanRedo() );
 897 }