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