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