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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "textctrl.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __VMS
  28 #define XtParent XTPARENT
  29 #endif
  30
  31 #include "wx/defs.h"
  32
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <ctype.h>
  36
  37 #include "wx/textctrl.h"
  38 #include "wx/settings.h"
  39 #include "wx/filefn.h"
  40 #include "wx/utils.h"
  41
  42 #ifdef __VMS__
  43 #pragma message disable nosimpint
  44 #endif
  45 #include <Xm/Text.h>
  46 #ifdef __VMS__
  47 #pragma message enable nosimpint
  48 #endif
  49
  50 #include "wx/motif/private.h"
  51
  52 // ----------------------------------------------------------------------------
  53 // private functions
  54 // ----------------------------------------------------------------------------
  55
  56 // helper: inserts the new text in the value of the text ctrl and returns the
  57 // result in place
  58 static void MergeChangesIntoString(wxString& value,
  59                                    XmTextVerifyCallbackStruct *textStruct);
  60
  61 // callbacks
  62 static void wxTextWindowChangedProc(Widget w, XtPointer clientData, XtPointer ptr);
  63 static void wxTextWindowModifyProc(Widget w, XtPointer clientData, XmTextVerifyCallbackStruct *cbs);
  64 static void wxTextWindowGainFocusProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs);
  65 static void wxTextWindowLoseFocusProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *cbs);
  66 static void wxTextWindowActivateProc(Widget w, XtPointer clientData, XmAnyCallbackStruct *ptr);
  67
  68     IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  69
  70     BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  71         EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  72         EVT_CHAR(wxTextCtrl::OnChar)
  73
  74     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
  75     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
  76     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
  77     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
  78     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
  79
  80     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
  81     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
  82     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
  83     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
  84     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
  85
  86     END_EVENT_TABLE()
  87
  88 // ============================================================================
  89 // implementation
  90 // ============================================================================
  91
  92 // ----------------------------------------------------------------------------
  93 // wxTextCtrl
  94 // ----------------------------------------------------------------------------
  95
  96 // Text item
  97 wxTextCtrl::wxTextCtrl()
  98 {
  99     m_tempCallbackStruct = (void*) NULL;
 100     m_modified = false;
 101     m_processedDefault = false;
 102 }
 103
 104 bool wxTextCtrl::Create(wxWindow *parent,
 105                         wxWindowID id,
 106                         const wxString& value,
 107                         const wxPoint& pos,
 108                         const wxSize& size,
 109                         long style,
 110                         const wxValidator& validator,
 111                         const wxString& name)
 112 {
 113     if( !CreateControl( parent, id, pos, size, style, validator, name ) )
 114         return false;
 115
 116     m_tempCallbackStruct = (void*) NULL;
 117     m_modified = false;
 118     m_processedDefault = false;
 119
 120     m_backgroundColour = *wxWHITE;
 121
 122     Widget parentWidget = (Widget) parent->GetClientWidget();
 123
 124     bool wantHorizScrolling = ((m_windowStyle & wxHSCROLL) != 0);
 125
 126     // If we don't have horizontal scrollbars, we want word wrap.
 127     bool wantWordWrap = !wantHorizScrolling;
 128
 129     if (m_windowStyle & wxTE_MULTILINE)
 130     {
 131         Arg args[2];
 132         XtSetArg (args[0], XmNscrollHorizontal, wantHorizScrolling ? True : False);
 133         XtSetArg (args[1], XmNwordWrap, wantWordWrap ? True : False);
 134
 135         m_mainWidget = (WXWidget) XmCreateScrolledText(parentWidget,
 136                                                        wxConstCast(name.c_str(), char),
 137                                                        args, 2);
 138
 139         XtVaSetValues ((Widget) m_mainWidget,
 140                         XmNeditable, ((style & wxTE_READONLY) ? False : True),
 141                         XmNeditMode, XmMULTI_LINE_EDIT,
 142                         NULL);
 143         XtManageChild ((Widget) m_mainWidget);
 144     }
 145     else
 146     {
 147         m_mainWidget = (WXWidget)XtVaCreateManagedWidget
 148                                  (
 149                                   wxConstCast(name.c_str(), char),
 150                                   xmTextWidgetClass,
 151                                   parentWidget,
 152                                   NULL
 153                                  );
 154
 155         XtVaSetValues ((Widget) m_mainWidget,
 156                         XmNeditable, ((style & wxTE_READONLY) ? False : True),
 157                         NULL);
 158
 159         // TODO: Is this relevant? What does it do?
 160         int noCols = 2;
 161         if (!value.IsNull() && (value.Length() > (unsigned int) noCols))
 162             noCols = value.Length();
 163         XtVaSetValues((Widget) m_mainWidget,
 164                       XmNcolumns, noCols,
 165                       NULL);
 166     }
 167
 168     // remove border if asked for
 169     if ( style & wxNO_BORDER )
 170     {
 171         XtVaSetValues((Widget)m_mainWidget,
 172                       XmNshadowThickness, 0,
 173                       NULL);
 174     }
 175
 176     if ( !value.empty() )
 177     {
 178         // do this instead... MB
 179         //
 180         XtVaSetValues( (Widget) m_mainWidget,
 181                        XmNvalue, wxConstCast(value.c_str(), char),
 182                        NULL);
 183     }
 184
 185     // install callbacks
 186     XtAddCallback((Widget) m_mainWidget, XmNvalueChangedCallback, (XtCallbackProc)wxTextWindowChangedProc, (XtPointer)this);
 187
 188     XtAddCallback((Widget) m_mainWidget, XmNmodifyVerifyCallback, (XtCallbackProc)wxTextWindowModifyProc, (XtPointer)this);
 189
 190     XtAddCallback((Widget) m_mainWidget, XmNactivateCallback, (XtCallbackProc)wxTextWindowActivateProc, (XtPointer)this);
 191
 192     XtAddCallback((Widget) m_mainWidget, XmNfocusCallback, (XtCallbackProc)wxTextWindowGainFocusProc, (XtPointer)this);
 193
 194     XtAddCallback((Widget) m_mainWidget, XmNlosingFocusCallback, (XtCallbackProc)wxTextWindowLoseFocusProc, (XtPointer)this);
 195
 196     // font
 197     ChangeFont(false);
 198
 199     AttachWidget (parent, m_mainWidget, (WXWidget) NULL,
 200                   pos.x, pos.y, size.x, size.y);
 201
 202     ChangeBackgroundColour();
 203
 204     return true;
 205 }
 206
 207 WXWidget wxTextCtrl::GetTopWidget() const
 208 {
 209     return IsMultiLine() ? (WXWidget)XtParent((Widget)m_mainWidget)
 210                          : m_mainWidget;
 211 }
 212
 213 wxString wxTextCtrl::GetValue() const
 214 {
 215     wxString str; // result
 216
 217     if (m_windowStyle & wxTE_PASSWORD)
 218     {
 219         // the value is stored always in m_value because it can't be retrieved
 220         // from the text control
 221         str = m_value;
 222     }
 223     else
 224     {
 225         // just get the string from Motif
 226         char *s = XmTextGetString ((Widget) m_mainWidget);
 227         if ( s )
 228         {
 229             str = s;
 230             XtFree (s);
 231         }
 232         //else: return empty string
 233
 234         if ( m_tempCallbackStruct )
 235         {
 236             // the string in the control isn't yet updated, can't use it as is
 237             MergeChangesIntoString(str, (XmTextVerifyCallbackStruct *)
 238                                    m_tempCallbackStruct);
 239         }
 240     }
 241
 242     return str;
 243 }
 244
 245 void wxTextCtrl::SetValue(const wxString& value)
 246 {
 247     m_inSetValue = true;
 248
 249     // do this instead... MB
 250     //
 251     // with (at least) OpenMotif 2.1 this causes a lot of flicker
 252 #if 0
 253     XtVaSetValues( (Widget) m_mainWidget,
 254                    XmNvalue, wxConstCast(value.c_str(), char),
 255                    NULL);
 256 #endif
 257
 258     Clear();
 259     AppendText( value );
 260
 261     m_inSetValue = false;
 262 }
 263
 264 // Clipboard operations
 265 void wxTextCtrl::Copy()
 266 {
 267     XmTextCopy((Widget) m_mainWidget, CurrentTime);
 268 }
 269
 270 void wxTextCtrl::Cut()
 271 {
 272     XmTextCut((Widget) m_mainWidget, CurrentTime);
 273 }
 274
 275 void wxTextCtrl::Paste()
 276 {
 277     XmTextPaste((Widget) m_mainWidget);
 278 }
 279
 280 bool wxTextCtrl::CanCopy() const
 281 {
 282     // Can copy if there's a selection
 283     long from, to;
 284     GetSelection(& from, & to);
 285     return (from != to) ;
 286 }
 287
 288 bool wxTextCtrl::CanCut() const
 289 {
 290     // Can cut if there's a selection
 291     long from, to;
 292     GetSelection(& from, & to);
 293     return (from != to) && (IsEditable());
 294 }
 295
 296 bool wxTextCtrl::CanPaste() const
 297 {
 298     return IsEditable() ;
 299 }
 300
 301 // Undo/redo
 302 void wxTextCtrl::Undo()
 303 {
 304     // Not possible in Motif
 305 }
 306
 307 void wxTextCtrl::Redo()
 308 {
 309     // Not possible in Motif
 310 }
 311
 312 bool wxTextCtrl::CanUndo() const
 313 {
 314     // No Undo in Motif
 315     return false;
 316 }
 317
 318 bool wxTextCtrl::CanRedo() const
 319 {
 320     // No Redo in Motif
 321     return false;
 322 }
 323
 324 // If the return values from and to are the same, there is no
 325 // selection.
 326 void wxTextCtrl::GetSelection(long* from, long* to) const
 327 {
 328     XmTextPosition left, right;
 329
 330     XmTextGetSelectionPosition((Widget) m_mainWidget, & left, & right);
 331
 332     *from = (long) left;
 333     *to = (long) right;
 334 }
 335
 336 bool wxTextCtrl::IsEditable() const
 337 {
 338     return (XmTextGetEditable((Widget) m_mainWidget) != 0);
 339 }
 340
 341 void wxTextCtrl::SetEditable(bool editable)
 342 {
 343     XmTextSetEditable((Widget) m_mainWidget, (Boolean) editable);
 344 }
 345
 346 void wxTextCtrl::SetInsertionPoint(long pos)
 347 {
 348     XmTextSetInsertionPosition ((Widget) m_mainWidget, (XmTextPosition) pos);
 349 }
 350
 351 void wxTextCtrl::SetInsertionPointEnd()
 352 {
 353     wxTextPos pos = GetLastPosition();
 354     SetInsertionPoint(pos);
 355 }
 356
 357 long wxTextCtrl::GetInsertionPoint() const
 358 {
 359     return (long) XmTextGetInsertionPosition ((Widget) m_mainWidget);
 360 }
 361
 362 wxTextPos wxTextCtrl::GetLastPosition() const
 363 {
 364     return (long) XmTextGetLastPosition ((Widget) m_mainWidget);
 365 }
 366
 367 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 368 {
 369     XmTextReplace ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 370         wxConstCast(value.c_str(), char));
 371 }
 372
 373 void wxTextCtrl::Remove(long from, long to)
 374 {
 375     XmTextSetSelection ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 376                       (Time) 0);
 377     XmTextRemove ((Widget) m_mainWidget);
 378 }
 379
 380 void wxTextCtrl::SetSelection(long from, long to)
 381 {
 382     if( to == -1 )
 383         to = GetLastPosition();
 384
 385     XmTextSetSelection ((Widget) m_mainWidget, (XmTextPosition) from, (XmTextPosition) to,
 386                       (Time) 0);
 387 }
 388
 389 void wxTextCtrl::WriteText(const wxString& text)
 390 {
 391     long textPosition = GetInsertionPoint() + text.length();
 392     XmTextInsert ((Widget) m_mainWidget, GetInsertionPoint(),
 393                   wxConstCast(text.c_str(), char));
 394     XtVaSetValues ((Widget) m_mainWidget, XmNcursorPosition, textPosition, NULL);
 395     SetInsertionPoint(textPosition);
 396     XmTextShowPosition ((Widget) m_mainWidget, textPosition);
 397     m_modified = true;
 398 }
 399
 400 void wxTextCtrl::AppendText(const wxString& text)
 401 {
 402     wxTextPos textPosition = GetLastPosition() + text.length();
 403     XmTextInsert ((Widget) m_mainWidget, GetLastPosition(),
 404                   wxConstCast(text.c_str(), char));
 405     XtVaSetValues ((Widget) m_mainWidget, XmNcursorPosition, textPosition, NULL);
 406     SetInsertionPoint(textPosition);
 407     XmTextShowPosition ((Widget) m_mainWidget, textPosition);
 408     m_modified = true;
 409 }
 410
 411 void wxTextCtrl::Clear()
 412 {
 413     XmTextSetString ((Widget) m_mainWidget, "");
 414     m_modified = false;
 415 }
 416
 417 bool wxTextCtrl::IsModified() const
 418 {
 419     return m_modified;
 420 }
 421
 422 // Makes modified or unmodified
 423 void wxTextCtrl::MarkDirty()
 424 {
 425     m_modified = true;
 426 }
 427
 428 void wxTextCtrl::DiscardEdits()
 429 {
 430     m_modified = false;
 431 }
 432
 433 int wxTextCtrl::GetNumberOfLines() const
 434 {
 435     // HIDEOUSLY inefficient, but we have no choice.
 436     char *s = XmTextGetString ((Widget) m_mainWidget);
 437     if (s)
 438     {
 439         long i = 0;
 440         int currentLine = 0;
 441         bool finished = false;
 442         while (!finished)
 443         {
 444             int ch = s[i];
 445             if (ch == '\n')
 446             {
 447                 currentLine++;
 448                 i++;
 449             }
 450             else if (ch == 0)
 451             {
 452                 finished = true;
 453             }
 454             else
 455                 i++;
 456         }
 457
 458         XtFree (s);
 459         return currentLine;
 460     }
 461     return 0;
 462 }
 463
 464 long wxTextCtrl::XYToPosition(long x, long y) const
 465 {
 466 /* It seems, that there is a bug in some versions of the Motif library,
 467     so the original wxWin-Code doesn't work. */
 468     /*
 469     Widget textWidget = (Widget) handle;
 470     return (long) XmTextXYToPos (textWidget, (Position) x, (Position) y);
 471     */
 472     /* Now a little workaround: */
 473     long r=0;
 474     for (int i=0; i<y; i++) r+=(GetLineLength(i)+1);
 475     return r+x;
 476 }
 477
 478 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 479 {
 480     Position xx, yy;
 481     XmTextPosToXY((Widget) m_mainWidget, pos, &xx, &yy);
 482     if ( x )
 483         *x = xx;
 484     if ( y )
 485         *y = yy;
 486
 487     return true;
 488 }
 489
 490 void wxTextCtrl::ShowPosition(long pos)
 491 {
 492     XmTextShowPosition ((Widget) m_mainWidget, (XmTextPosition) pos);
 493 }
 494
 495 int wxTextCtrl::GetLineLength(long lineNo) const
 496 {
 497     wxString str = GetLineText (lineNo);
 498     return (int) str.Length();
 499 }
 500
 501 wxString wxTextCtrl::GetLineText(long lineNo) const
 502 {
 503     // HIDEOUSLY inefficient, but we have no choice.
 504     char *s = XmTextGetString ((Widget) m_mainWidget);
 505
 506     if (s)
 507     {
 508         wxString buf("");
 509         long i;
 510         int currentLine = 0;
 511         for (i = 0; currentLine != lineNo && s[i]; i++ )
 512             if (s[i] == '\n')
 513                 currentLine++;
 514             // Now get the text
 515             int j;
 516             for (j = 0; s[i] && s[i] != '\n'; i++, j++ )
 517                 buf += s[i];
 518
 519             XtFree(s);
 520             return buf;
 521     }
 522     else
 523         return wxEmptyString;
 524 }
 525
 526 /*
 527 * Text item
 528 */
 529
 530 void wxTextCtrl::Command(wxCommandEvent & event)
 531 {
 532     SetValue (event.GetString());
 533     ProcessCommand (event);
 534 }
 535
 536 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 537 {
 538     // By default, load the first file into the text window.
 539     if (event.GetNumberOfFiles() > 0)
 540     {
 541         LoadFile(event.GetFiles()[0]);
 542     }
 543 }
 544
 545 void wxTextCtrl::OnChar(wxKeyEvent& event)
 546 {
 547     // Indicates that we should generate a normal command, because
 548     // we're letting default behaviour happen (otherwise it's vetoed
 549     // by virtue of overriding OnChar)
 550     m_processedDefault = true;
 551
 552     if (m_tempCallbackStruct)
 553     {
 554         XmTextVerifyCallbackStruct *textStruct =
 555             (XmTextVerifyCallbackStruct *) m_tempCallbackStruct;
 556         textStruct->doit = True;
 557         if (isascii(event.m_keyCode) && (textStruct->text->length == 1))
 558         {
 559             textStruct->text->ptr[0] = ((event.m_keyCode == WXK_RETURN) ? 10 : event.m_keyCode);
 560         }
 561     }
 562 }
 563
 564 void wxTextCtrl::ChangeFont(bool keepOriginalSize)
 565 {
 566     wxWindow::ChangeFont(keepOriginalSize);
 567 }
 568
 569 void wxTextCtrl::ChangeBackgroundColour()
 570 {
 571     wxWindow::ChangeBackgroundColour();
 572
 573     /* TODO: should scrollbars be affected? Should probably have separate
 574     * function to change them (by default, taken from wxSystemSettings)
 575     */
 576     if (m_windowStyle & wxTE_MULTILINE)
 577     {
 578         Widget parent = XtParent ((Widget) m_mainWidget);
 579         Widget hsb, vsb;
 580
 581         XtVaGetValues (parent,
 582             XmNhorizontalScrollBar, &hsb,
 583             XmNverticalScrollBar, &vsb,
 584             NULL);
 585         wxColour backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 586         if (hsb)
 587             wxDoChangeBackgroundColour((WXWidget) hsb, backgroundColour, true);
 588         if (vsb)
 589             wxDoChangeBackgroundColour((WXWidget) vsb, backgroundColour, true);
 590
 591         // MBN: why change parent background?
 592         // DoChangeBackgroundColour((WXWidget) parent, m_backgroundColour, true);
 593     }
 594 }
 595
 596 void wxTextCtrl::ChangeForegroundColour()
 597 {
 598     wxWindow::ChangeForegroundColour();
 599
 600     if (m_windowStyle & wxTE_MULTILINE)
 601     {
 602         Widget parent = XtParent ((Widget) m_mainWidget);
 603         Widget hsb, vsb;
 604
 605         XtVaGetValues (parent,
 606             XmNhorizontalScrollBar, &hsb,
 607             XmNverticalScrollBar, &vsb,
 608             NULL);
 609
 610             /* TODO: should scrollbars be affected? Should probably have separate
 611             * function to change them (by default, taken from wxSystemSettings)
 612             if (hsb)
 613             DoChangeForegroundColour((WXWidget) hsb, m_foregroundColour);
 614             if (vsb)
 615             DoChangeForegroundColour((WXWidget) vsb, m_foregroundColour);
 616         */
 617         wxDoChangeForegroundColour((WXWidget) parent, m_foregroundColour);
 618     }
 619 }
 620
 621 void wxTextCtrl::DoSendEvents(void *wxcbs, long keycode)
 622 {
 623     // we're in process of updating the text control
 624     m_tempCallbackStruct = wxcbs;
 625
 626     XmTextVerifyCallbackStruct *cbs = (XmTextVerifyCallbackStruct *)wxcbs;
 627
 628     wxKeyEvent event (wxEVT_CHAR);
 629     event.SetId(GetId());
 630     event.m_keyCode = keycode;
 631     event.SetEventObject(this);
 632
 633     // Only if wxTextCtrl::OnChar is called will this be set to True (and
 634     // the character passed through)
 635     cbs->doit = False;
 636
 637     GetEventHandler()->ProcessEvent(event);
 638
 639     if ( !InSetValue() && m_processedDefault )
 640     {
 641         // Can generate a command
 642         wxCommandEvent commandEvent(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 643         commandEvent.SetEventObject(this);
 644         ProcessCommand(commandEvent);
 645     }
 646
 647     // do it after the (user) event handlers processed the events because
 648     // otherwise GetValue() would return incorrect (not yet updated value)
 649     m_tempCallbackStruct = NULL;
 650 }
 651
 652 wxSize wxDoGetSingleTextCtrlBestSize( Widget textWidget,
 653                                       const wxWindow* window )
 654 {
 655     Dimension xmargin, ymargin, highlight, shadow;
 656     char* value;
 657
 658     XtVaGetValues( textWidget,
 659                    XmNmarginWidth, &xmargin,
 660                    XmNmarginHeight, &ymargin,
 661                    XmNvalue, &value,
 662                    XmNhighlightThickness, &highlight,
 663                    XmNshadowThickness, &shadow,
 664                    NULL );
 665
 666     if( !value )
 667         value = "|";
 668
 669     int x, y;
 670     window->GetTextExtent( value, &x, &y );
 671
 672     if( x < 100 ) x = 100;
 673
 674     return wxSize( x + 2 * xmargin + 2 * highlight + 2 * shadow,
 675                    // MBN: +2 necessary: Lesstif bug or mine?
 676                    y + 2 * ymargin + 2 * highlight + 2 * shadow + 2 );
 677 }
 678
 679 wxSize wxTextCtrl::DoGetBestSize() const
 680 {
 681     if( IsSingleLine() )
 682     {
 683         wxSize best = wxControl::DoGetBestSize();
 684
 685         if( best.x < 110 ) best.x = 110;
 686
 687         return best;
 688     }
 689     else
 690         return wxWindow::DoGetBestSize();
 691 }
 692
 693 // ----------------------------------------------------------------------------
 694 // helpers and Motif callbacks
 695 // ----------------------------------------------------------------------------
 696
 697 static void MergeChangesIntoString(wxString& value,
 698                                    XmTextVerifyCallbackStruct *cbs)
 699 {
 700     /* _sm_
 701      * At least on my system (SunOS 4.1.3 + Motif 1.2), you need to think of
 702      * every event as a replace event.  cbs->text->ptr gives the replacement
 703      * text, cbs->startPos gives the index of the first char affected by the
 704      * replace, and cbs->endPos gives the index one more than the last char
 705      * affected by the replace (startPos == endPos implies an empty range).
 706      * Hence, a deletion is represented by replacing all input text with a
 707      * blank string ("", *not* NULL!).  A simple insertion that does not
 708      * overwrite any text has startPos == endPos.
 709      */
 710
 711     if ( !value )
 712     {
 713         // easy case: the ol value was empty
 714         value = cbs->text->ptr;
 715     }
 716     else
 717     {
 718         // merge the changes into the value
 719         const char * const passwd = value;
 720         int len = value.length();
 721
 722         len += ( cbs->text->ptr ?
 723                  strlen(cbs->text->ptr) :
 724                  0 ) + 1;                      // + new text (if any) + NUL
 725         len -= cbs->endPos - cbs->startPos;    // - text from affected region.
 726
 727         char * newS = new char [len];
 728         char * dest = newS,
 729              * insert = cbs->text->ptr;
 730
 731         // Copy (old) text from passwd, up to the start posn of the change.
 732         int i;
 733         const char * p = passwd;
 734         for (i = 0; i < cbs->startPos; ++i)
 735             *dest++ = *p++;
 736
 737         // Copy the text to be inserted).
 738         if (insert)
 739             while (*insert)
 740                 *dest++ = *insert++;
 741
 742         // Finally, copy into newS any remaining text from passwd[endPos] on.
 743         for (p = passwd + cbs->endPos; *p; )
 744             *dest++ = *p++;
 745         *dest = 0;
 746
 747         value = newS;
 748
 749         delete[] newS;
 750     }
 751 }
 752
 753 static void
 754 wxTextWindowChangedProc (Widget w, XtPointer clientData, XtPointer WXUNUSED(ptr))
 755 {
 756     if (!wxGetWindowFromTable(w))
 757         // Widget has been deleted!
 758         return;
 759
 760     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 761     tw->SetModified(true);
 762 }
 763
 764 static void
 765 wxTextWindowModifyProc (Widget WXUNUSED(w), XtPointer clientData, XmTextVerifyCallbackStruct *cbs)
 766 {
 767     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 768     tw->m_processedDefault = false;
 769
 770     // First, do some stuff if it's a password control: in this case, we need
 771     // to store the string inside the class because GetValue() can't retrieve
 772     // it from the text ctrl. We do *not* do it in other circumstances because
 773     // it would double the amount of memory needed.
 774
 775     if ( tw->GetWindowStyleFlag() & wxTE_PASSWORD )
 776     {
 777         MergeChangesIntoString(tw->m_value, cbs);
 778
 779         if ( cbs->text->length > 0 )
 780         {
 781             int i;
 782             for (i = 0; i < cbs->text->length; ++i)
 783                 cbs->text->ptr[i] = '*';
 784             cbs->text->ptr[i] = '\0';
 785         }
 786     }
 787
 788     if(tw->InSetValue())
 789         return;
 790
 791     // If we're already within an OnChar, return: probably a programmatic
 792     // insertion.
 793     if (tw->m_tempCallbackStruct)
 794         return;
 795
 796     // Check for a backspace
 797     if (cbs->startPos == (cbs->currInsert - 1))
 798     {
 799         tw->DoSendEvents((void *)cbs, WXK_DELETE);
 800
 801         return;
 802     }
 803
 804     // Pasting operation: let it through without calling OnChar
 805     if (cbs->text->length > 1)
 806         return;
 807
 808     // Something other than text
 809     if (cbs->text->ptr == NULL)
 810         return;
 811
 812     // normal key press
 813     char ch = cbs->text->ptr[0];
 814     tw->DoSendEvents((void *)cbs, ch == '\n' ? '\r' : ch);
 815 }
 816
 817 static void
 818 wxTextWindowGainFocusProc (Widget w, XtPointer clientData, XmAnyCallbackStruct *WXUNUSED(cbs))
 819 {
 820     if (!wxGetWindowFromTable(w))
 821         return;
 822
 823     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 824     wxFocusEvent event(wxEVT_SET_FOCUS, tw->GetId());
 825     event.SetEventObject(tw);
 826     tw->GetEventHandler()->ProcessEvent(event);
 827 }
 828
 829 static void
 830 wxTextWindowLoseFocusProc (Widget w, XtPointer clientData, XmAnyCallbackStruct *WXUNUSED(cbs))
 831 {
 832     if (!wxGetWindowFromTable(w))
 833         return;
 834
 835     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 836     wxFocusEvent event(wxEVT_KILL_FOCUS, tw->GetId());
 837     event.SetEventObject(tw);
 838     tw->GetEventHandler()->ProcessEvent(event);
 839 }
 840
 841 static void wxTextWindowActivateProc(Widget w, XtPointer clientData,
 842                                      XmAnyCallbackStruct *WXUNUSED(ptr))
 843 {
 844     if (!wxGetWindowFromTable(w))
 845         return;
 846
 847     wxTextCtrl *tw = (wxTextCtrl *) clientData;
 848
 849     if (tw->InSetValue())
 850         return;
 851
 852     wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER);
 853     event.SetId(tw->GetId());
 854     event.SetEventObject(tw);
 855     tw->ProcessCommand(event);
 856 }
 857
 858 void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
 859 {
 860     Cut();
 861 }
 862
 863 void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
 864 {
 865     Copy();
 866 }
 867
 868 void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
 869 {
 870     Paste();
 871 }
 872
 873 void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
 874 {
 875     Undo();
 876 }
 877
 878 void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
 879 {
 880     Redo();
 881 }
 882
 883 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
 884 {
 885     event.Enable( CanCut() );
 886 }
 887
 888 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
 889 {
 890     event.Enable( CanCopy() );
 891 }
 892
 893 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
 894 {
 895     event.Enable( CanPaste() );
 896 }
 897
 898 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
 899 {
 900     event.Enable( CanUndo() );
 901 }
 902
 903 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
 904 {
 905     event.Enable( CanRedo() );
 906 }