src/msw/textctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        textctrl.cpp
   3 // Purpose:     wxTextCtrl
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 #ifdef __GNUG__
  17     #pragma implementation "textctrl.h"
  18 #endif
  19
  20 // ----------------------------------------------------------------------------
  21 // headers
  22 // ----------------------------------------------------------------------------
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/textctrl.h"
  33     #include "wx/settings.h"
  34     #include "wx/brush.h"
  35     #include "wx/utils.h"
  36     #include "wx/log.h"
  37 #endif
  38
  39 #if wxUSE_CLIPBOARD
  40     #include "wx/app.h"
  41     #include "wx/clipbrd.h"
  42 #endif
  43
  44 #include "wx/textfile.h"
  45
  46 #include <windowsx.h>
  47
  48 #include "wx/msw/private.h"
  49
  50 #include <string.h>
  51 #include <stdlib.h>
  52 #include <sys/types.h>
  53
  54 #if wxUSE_IOSTREAMH
  55 #   include <fstream.h>
  56 #else
  57 #   include <fstream>
  58 #endif
  59
  60 #if wxUSE_RICHEDIT && !defined(__GNUWIN32__)
  61     #include <richedit.h>
  62 #endif
  63
  64 #if !USE_SHARED_LIBRARY
  65
  66 // ----------------------------------------------------------------------------
  67 // event tables and other macros
  68 // ----------------------------------------------------------------------------
  69
  70 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  71
  72 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  73     EVT_CHAR(wxTextCtrl::OnChar)
  74     EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  75
  76     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
  77     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
  78     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
  79     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
  80     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
  81
  82     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
  83     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
  84     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
  85     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
  86     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
  87 END_EVENT_TABLE()
  88
  89 #endif // USE_SHARED_LIBRARY
  90
  91 // ============================================================================
  92 // implementation
  93 // ============================================================================
  94
  95 // ----------------------------------------------------------------------------
  96 // creation
  97 // ----------------------------------------------------------------------------
  98
  99 wxTextCtrl::wxTextCtrl()
 100 {
 101 #if wxUSE_RICHEDIT
 102     m_isRich = FALSE;
 103 #endif
 104 }
 105
 106 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
 107                         const wxString& value,
 108                         const wxPoint& pos,
 109                         const wxSize& size,
 110                         long style,
 111                         const wxValidator& validator,
 112                         const wxString& name)
 113 {
 114     // base initialization
 115     if ( !CreateBase(parent, id, pos, size, style, name) )
 116         return FALSE;
 117
 118     SetValidator(validator);
 119     if ( parent )
 120         parent->AddChild(this);
 121
 122     // set colours
 123     SetupColours();
 124
 125     // translate wxWin style flags to MSW ones, checking for consistency while
 126     // doing it
 127     long msStyle = ES_LEFT | WS_VISIBLE | WS_CHILD | WS_TABSTOP;
 128     if ( m_windowStyle & wxTE_MULTILINE )
 129     {
 130         wxASSERT_MSG( !(m_windowStyle & wxTE_PROCESS_ENTER),
 131                       _T("wxTE_PROCESS_ENTER style is ignored for multiline "
 132                          "text controls (they always process it)") );
 133
 134         msStyle |= ES_MULTILINE | ES_WANTRETURN | WS_VSCROLL;
 135         m_windowStyle |= wxTE_PROCESS_ENTER;
 136     }
 137     else
 138         msStyle |= ES_AUTOHSCROLL;
 139
 140     if (m_windowStyle & wxTE_READONLY)
 141         msStyle |= ES_READONLY;
 142
 143     if (m_windowStyle & wxHSCROLL)
 144         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 145     if (m_windowStyle & wxTE_PASSWORD) // hidden input
 146         msStyle |= ES_PASSWORD;
 147
 148     // we always want the characters and the arrows
 149     m_lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;
 150
 151     // we may have several different cases:
 152     // 1. normal case: both TAB and ENTER are used for dialog navigation
 153     // 2. ctrl which wants TAB for itself: ENTER is used to pass to the next
 154     //    control in the dialog
 155     // 3. ctrl which wants ENTER for itself: TAB is used for dialog navigation
 156     // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to pass to
 157     //    the next control
 158     if ( m_windowStyle & wxTE_PROCESS_ENTER )
 159         m_lDlgCode |= DLGC_WANTMESSAGE;
 160     if ( m_windowStyle & wxTE_PROCESS_TAB )
 161         m_lDlgCode |= DLGC_WANTTAB;
 162
 163     // do create the control - either an EDIT or RICHEDIT
 164     const wxChar *windowClass = _T("EDIT");
 165
 166 #if wxUSE_RICHEDIT
 167     // multiline edit controls are RICHEDITs except for those which have a
 168     // simple border (VZ: why??)
 169     if ( (m_windowStyle & wxTE_MULTILINE) &&
 170          !(m_windowStyle & wxSIMPLE_BORDER) )
 171     {
 172         msStyle |= ES_AUTOVSCROLL;
 173         m_isRich = TRUE;
 174         windowClass = _T("RICHEDIT");
 175     }
 176     else
 177         m_isRich = FALSE;
 178 #endif
 179
 180     bool want3D;
 181     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 182
 183     // Even with extended styles, need to combine with WS_BORDER for them to
 184     // look right.
 185     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 186         msStyle |= WS_BORDER;
 187
 188     // NB: don't use pos and size as CreateWindowEx arguments because they
 189     //     might be -1 in which case we should use the default values (and
 190     //     SetSize called below takes care of it)
 191     m_hWnd = (WXHWND)::CreateWindowEx(exStyle,
 192                                       windowClass,
 193                                       NULL,
 194                                       msStyle,
 195                                       0, 0, 0, 0,
 196                                       GetHwndOf(parent),
 197                                       (HMENU)m_windowId,
 198                                       wxGetInstance(),
 199                                       NULL);
 200
 201     wxCHECK_MSG( m_hWnd, FALSE, _T("Failed to create text ctrl") );
 202
 203 #if wxUSE_CTL3D
 204     if ( want3D )
 205     {
 206         Ctl3dSubclassCtl(GetHwnd());
 207         m_useCtl3D = TRUE;
 208     }
 209 #endif
 210
 211 #if wxUSE_RICHEDIT
 212     if (m_isRich)
 213     {
 214         // Have to enable events
 215         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0,
 216                       ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 217     }
 218 #endif
 219
 220     SubclassWin(GetHWND());
 221
 222     // set font, position, size and initial value
 223     wxFont& fontParent = parent->GetFont();
 224     if ( fontParent.Ok() )
 225     {
 226         SetFont(fontParent);
 227     }
 228     else
 229     {
 230         SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 231     }
 232
 233     // Causes a crash for Symantec C++ and WIN32 for some reason
 234 #if !(defined(__SC__) && defined(__WIN32__))
 235     if ( !value.IsEmpty() )
 236     {
 237         SetValue(value);
 238     }
 239 #endif
 240
 241     SetSize(pos.x, pos.y, size.x, size.y);
 242
 243     return TRUE;
 244 }
 245
 246 // Make sure the window style (etc.) reflects the HWND style (roughly)
 247 void wxTextCtrl::AdoptAttributesFromHWND()
 248 {
 249   wxWindow::AdoptAttributesFromHWND();
 250
 251   HWND hWnd = GetHwnd();
 252   long style = GetWindowLong(hWnd, GWL_STYLE);
 253
 254   // retrieve the style to see whether this is an edit or richedit ctrl
 255 #if wxUSE_RICHEDIT
 256   wxChar buf[256];
 257
 258   GetClassName(hWnd, buf, WXSIZEOF(buf));
 259
 260   if ( wxStricmp(buf, _T("EDIT")) == 0 )
 261     m_isRich = FALSE;
 262   else
 263     m_isRich = TRUE;
 264 #endif // wxUSE_RICHEDIT
 265
 266   if (style & ES_MULTILINE)
 267     m_windowStyle |= wxTE_MULTILINE;
 268   if (style & ES_PASSWORD)
 269     m_windowStyle |= wxTE_PASSWORD;
 270   if (style & ES_READONLY)
 271     m_windowStyle |= wxTE_READONLY;
 272   if (style & ES_WANTRETURN)
 273     m_windowStyle |= wxTE_PROCESS_ENTER;
 274 }
 275
 276 void wxTextCtrl::SetupColours()
 277 {
 278     // FIXME why is bg colour not inherited from parent?
 279     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 280     SetForegroundColour(GetParent()->GetForegroundColour());
 281 }
 282
 283 // ----------------------------------------------------------------------------
 284 // set/get the controls text
 285 // ----------------------------------------------------------------------------
 286
 287 wxString wxTextCtrl::GetValue() const
 288 {
 289     return wxGetWindowText(GetHWND());
 290 }
 291
 292 void wxTextCtrl::SetValue(const wxString& value)
 293 {
 294     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 295
 296     SetWindowText(GetHwnd(), valueDos);
 297
 298     AdjustSpaceLimit();
 299 }
 300
 301 void wxTextCtrl::WriteText(const wxString& value)
 302 {
 303     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 304
 305     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 306
 307     AdjustSpaceLimit();
 308 }
 309
 310 void wxTextCtrl::AppendText(const wxString& text)
 311 {
 312     SetInsertionPointEnd();
 313     WriteText(text);
 314 }
 315
 316 void wxTextCtrl::Clear()
 317 {
 318     SetWindowText(GetHwnd(), _T(""));
 319 }
 320
 321 // ----------------------------------------------------------------------------
 322 // Clipboard operations
 323 // ----------------------------------------------------------------------------
 324
 325 void wxTextCtrl::Copy()
 326 {
 327     if (CanCopy())
 328     {
 329         HWND hWnd = GetHwnd();
 330         SendMessage(hWnd, WM_COPY, 0, 0L);
 331     }
 332 }
 333
 334 void wxTextCtrl::Cut()
 335 {
 336     if (CanCut())
 337     {
 338         HWND hWnd = GetHwnd();
 339         SendMessage(hWnd, WM_CUT, 0, 0L);
 340     }
 341 }
 342
 343 void wxTextCtrl::Paste()
 344 {
 345     if (CanPaste())
 346     {
 347         HWND hWnd = GetHwnd();
 348         SendMessage(hWnd, WM_PASTE, 0, 0L);
 349     }
 350 }
 351
 352 bool wxTextCtrl::CanCopy() const
 353 {
 354     // Can copy if there's a selection
 355     long from, to;
 356     GetSelection(& from, & to);
 357     return (from != to);
 358 }
 359
 360 bool wxTextCtrl::CanCut() const
 361 {
 362     // Can cut if there's a selection
 363     long from, to;
 364     GetSelection(& from, & to);
 365     return (from != to);
 366 }
 367
 368 bool wxTextCtrl::CanPaste() const
 369 {
 370 #if wxUSE_RICHEDIT
 371     if (m_isRich)
 372     {
 373         int dataFormat = 0; // 0 == any format
 374         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 375     }
 376 #endif
 377     if (!IsEditable())
 378         return FALSE;
 379
 380     // Standard edit control: check for straight text on clipboard
 381     bool isTextAvailable = FALSE;
 382     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 383     {
 384         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 385         ::CloseClipboard();
 386     }
 387
 388     return isTextAvailable;
 389 }
 390
 391 // ----------------------------------------------------------------------------
 392 // Accessors
 393 // ----------------------------------------------------------------------------
 394
 395 void wxTextCtrl::SetEditable(bool editable)
 396 {
 397     HWND hWnd = GetHwnd();
 398     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 399 }
 400
 401 void wxTextCtrl::SetInsertionPoint(long pos)
 402 {
 403     HWND hWnd = GetHwnd();
 404 #ifdef __WIN32__
 405 #if wxUSE_RICHEDIT
 406     if ( m_isRich)
 407     {
 408         CHARRANGE range;
 409         range.cpMin = pos;
 410         range.cpMax = pos;
 411         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 412         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 413     }
 414     else
 415 #endif // wxUSE_RICHEDIT
 416     {
 417         SendMessage(hWnd, EM_SETSEL, pos, pos);
 418         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 419     }
 420 #else // Win16
 421     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 422 #endif // Win32/16
 423
 424     static const char *nothing = "";
 425     SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 426 }
 427
 428 void wxTextCtrl::SetInsertionPointEnd()
 429 {
 430     long pos = GetLastPosition();
 431     SetInsertionPoint(pos);
 432 }
 433
 434 long wxTextCtrl::GetInsertionPoint() const
 435 {
 436 #if wxUSE_RICHEDIT
 437     if (m_isRich)
 438     {
 439         CHARRANGE range;
 440         range.cpMin = 0;
 441         range.cpMax = 0;
 442         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 443         return range.cpMin;
 444     }
 445 #endif
 446
 447     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 448     return Pos & 0xFFFF;
 449 }
 450
 451 long wxTextCtrl::GetLastPosition() const
 452 {
 453     HWND hWnd = GetHwnd();
 454
 455     // Will always return a number > 0 (according to docs)
 456     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 457
 458     // This gets the char index for the _beginning_ of the last line
 459     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 460
 461     // Get number of characters in the last line. We'll add this to the character
 462     // index for the last line, 1st position.
 463     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 464
 465     return (long)(charIndex + lineLength);
 466 }
 467
 468 // If the return values from and to are the same, there is no
 469 // selection.
 470 void wxTextCtrl::GetSelection(long* from, long* to) const
 471 {
 472 #if wxUSE_RICHEDIT
 473     if (m_isRich)
 474     {
 475         CHARRANGE charRange;
 476         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 477
 478         *from = charRange.cpMin;
 479         *to = charRange.cpMax;
 480
 481         return;
 482     }
 483 #endif
 484     DWORD dwStart, dwEnd;
 485     WPARAM wParam = (WPARAM) (DWORD*) & dwStart; // receives starting position
 486     LPARAM lParam = (LPARAM) (DWORD*) & dwEnd;   // receives ending position
 487
 488     ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 489
 490     *from = dwStart;
 491     *to = dwEnd;
 492 }
 493
 494 bool wxTextCtrl::IsEditable() const
 495 {
 496     long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);
 497
 498     return ((style & ES_READONLY) == 0);
 499 }
 500
 501 // ----------------------------------------------------------------------------
 502 // Editing
 503 // ----------------------------------------------------------------------------
 504
 505 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 506 {
 507 #if wxUSE_CLIPBOARD
 508     HWND hWnd = GetHwnd();
 509     long fromChar = from;
 510     long toChar = to;
 511
 512     // Set selection and remove it
 513 #ifdef __WIN32__
 514     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 515 #else
 516     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 517 #endif
 518     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 519
 520     // Now replace with 'value', by pasting.
 521     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const wxChar *)value, 0, 0);
 522
 523     // Paste into edit control
 524     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 525 #else
 526     wxFAIL_MSG("wxTextCtrl::Replace not implemented if wxUSE_CLIPBOARD is 0.");
 527 #endif
 528 }
 529
 530 void wxTextCtrl::Remove(long from, long to)
 531 {
 532     HWND hWnd = GetHwnd();
 533     long fromChar = from;
 534     long toChar = to;
 535
 536     // Cut all selected text
 537 #ifdef __WIN32__
 538     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 539 #else
 540     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 541 #endif
 542     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 543 }
 544
 545 void wxTextCtrl::SetSelection(long from, long to)
 546 {
 547     HWND hWnd = GetHwnd();
 548     long fromChar = from;
 549     long toChar = to;
 550
 551     // if from and to are both -1, it means (in wxWindows) that all text should
 552     // be selected. Translate into Windows convention
 553     if ((from == -1) && (to == -1))
 554     {
 555       fromChar = 0;
 556       toChar = -1;
 557     }
 558
 559 #ifdef __WIN32__
 560     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 561     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 562 #else
 563     // WPARAM is 0: selection is scrolled into view
 564     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 565 #endif
 566 }
 567
 568 bool wxTextCtrl::LoadFile(const wxString& file)
 569 {
 570     if ( wxTextCtrlBase::LoadFile(file) )
 571     {
 572         // update the size limit if needed
 573         AdjustSpaceLimit();
 574
 575         return TRUE;
 576     }
 577
 578     return FALSE;
 579 }
 580
 581 bool wxTextCtrl::IsModified() const
 582 {
 583     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 584 }
 585
 586 // Makes 'unmodified'
 587 void wxTextCtrl::DiscardEdits()
 588 {
 589     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 590 }
 591
 592 int wxTextCtrl::GetNumberOfLines() const
 593 {
 594     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 595 }
 596
 597 long wxTextCtrl::XYToPosition(long x, long y) const
 598 {
 599     HWND hWnd = GetHwnd();
 600
 601     // This gets the char index for the _beginning_ of this line
 602     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 603     return (long)(x + charIndex);
 604 }
 605
 606 void wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 607 {
 608     HWND hWnd = GetHwnd();
 609
 610     // This gets the line number containing the character
 611     int lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0);
 612     // This gets the char index for the _beginning_ of this line
 613     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 614     // The X position must therefore be the different between pos and charIndex
 615     *x = (long)(pos - charIndex);
 616     *y = (long)lineNo;
 617 }
 618
 619 void wxTextCtrl::ShowPosition(long pos)
 620 {
 621     HWND hWnd = GetHwnd();
 622
 623     // To scroll to a position, we pass the number of lines and characters
 624     // to scroll *by*. This means that we need to:
 625     // (1) Find the line position of the current line.
 626     // (2) Find the line position of pos.
 627     // (3) Scroll by (pos - current).
 628     // For now, ignore the horizontal scrolling.
 629
 630     // Is this where scrolling is relative to - the line containing the caret?
 631     // Or is the first visible line??? Try first visible line.
 632 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 633
 634     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 635
 636     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 637
 638     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 639
 640     if (linesToScroll != 0)
 641       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 642 }
 643
 644 int wxTextCtrl::GetLineLength(long lineNo) const
 645 {
 646     long charIndex = XYToPosition(0, lineNo);
 647     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 648     return len;
 649 }
 650
 651 wxString wxTextCtrl::GetLineText(long lineNo) const
 652 {
 653     size_t len = (size_t)GetLineLength(lineNo) + 1;
 654     char *buf = (char *)malloc(len);
 655     *(WORD *)buf = len;
 656     int noChars = (int)SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 657     buf[noChars] = 0;
 658
 659     wxString str(buf);
 660
 661     free(buf);
 662
 663     return str;
 664 }
 665
 666 // ----------------------------------------------------------------------------
 667 // Undo/redo
 668 // ----------------------------------------------------------------------------
 669
 670 void wxTextCtrl::Undo()
 671 {
 672     if (CanUndo())
 673     {
 674         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 675     }
 676 }
 677
 678 void wxTextCtrl::Redo()
 679 {
 680     if (CanRedo())
 681     {
 682         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 683         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 684     }
 685 }
 686
 687 bool wxTextCtrl::CanUndo() const
 688 {
 689     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 690 }
 691
 692 bool wxTextCtrl::CanRedo() const
 693 {
 694     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 695 }
 696
 697 // ----------------------------------------------------------------------------
 698 // implemenation details
 699 // ----------------------------------------------------------------------------
 700
 701 void wxTextCtrl::Command(wxCommandEvent & event)
 702 {
 703     SetValue(event.GetString());
 704     ProcessCommand (event);
 705 }
 706
 707 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 708 {
 709     // By default, load the first file into the text window.
 710     if (event.GetNumberOfFiles() > 0)
 711     {
 712         LoadFile(event.GetFiles()[0]);
 713     }
 714 }
 715
 716 WXHBRUSH wxTextCtrl::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 717                                 WXUINT message, WXWPARAM wParam,
 718                                 WXLPARAM lParam)
 719 {
 720 #if wxUSE_CTL3D
 721     if ( m_useCtl3D )
 722     {
 723         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 724         return (WXHBRUSH) hbrush;
 725     }
 726 #endif
 727
 728     HDC hdc = (HDC)pDC;
 729     SetBkMode(hdc, GetParent()->GetTransparentBackground() ? TRANSPARENT
 730                                                            : OPAQUE);
 731
 732     ::SetBkColor(hdc, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 733     ::SetTextColor(hdc, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 734
 735     wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 736
 737     return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 738 }
 739
 740 void wxTextCtrl::OnChar(wxKeyEvent& event)
 741 {
 742     switch ( event.KeyCode() )
 743     {
 744         case WXK_RETURN:
 745             if ( !(m_windowStyle & wxTE_MULTILINE) )
 746             {
 747                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 748                 event.SetEventObject( this );
 749                 if ( GetEventHandler()->ProcessEvent(event) )
 750                     return;
 751             }
 752             //else: multiline controls need Enter for themselves
 753
 754             break;
 755
 756         case WXK_TAB:
 757             // always produce navigation event - even if we process TAB
 758             // ourselves the fact that we got here means that the user code
 759             // decided to skip processing of this TAB - probably to let it
 760             // do its default job.
 761             //
 762             // NB: Notice that Ctrl-Tab is handled elsewhere and Alt-Tab is
 763             //     handled by Windows
 764             {
 765                 wxNavigationKeyEvent eventNav;
 766                 eventNav.SetDirection(!event.ShiftDown());
 767                 eventNav.SetWindowChange(FALSE);
 768                 eventNav.SetEventObject(this);
 769
 770                 if ( GetEventHandler()->ProcessEvent(eventNav) )
 771                     return;
 772             }
 773             break;
 774
 775         default:
 776             event.Skip();
 777             return;
 778     }
 779
 780     // don't just call event.Skip() because this will cause TABs and ENTERs
 781     // be passed upwards and we don't always want this - instead process it
 782     // right here
 783
 784     // FIXME
 785     event.Skip();
 786 }
 787
 788 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 789 {
 790     switch (param)
 791     {
 792         case EN_SETFOCUS:
 793         case EN_KILLFOCUS:
 794             {
 795                 wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
 796                         : wxEVT_SET_FOCUS,
 797                         m_windowId);
 798                 event.SetEventObject( this );
 799                 GetEventHandler()->ProcessEvent(event);
 800             }
 801             break;
 802
 803         case EN_CHANGE:
 804             {
 805                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
 806                 wxString val(GetValue());
 807                 if ( !val.IsNull() )
 808                     event.m_commandString = WXSTRINGCAST val;
 809                 event.SetEventObject( this );
 810                 ProcessCommand(event);
 811             }
 812             break;
 813
 814         case EN_ERRSPACE:
 815             // the text size limit has been hit - increase it
 816             AdjustSpaceLimit();
 817             break;
 818
 819             // the other notification messages are not processed
 820         case EN_UPDATE:
 821         case EN_MAXTEXT:
 822         case EN_HSCROLL:
 823         case EN_VSCROLL:
 824         default:
 825             return FALSE;
 826     }
 827
 828     // processed
 829     return TRUE;
 830 }
 831
 832 void wxTextCtrl::AdjustSpaceLimit()
 833 {
 834 #ifndef __WIN16__
 835     unsigned int len = ::GetWindowTextLength(GetHwnd()),
 836     limit = ::SendMessage(GetHwnd(), EM_GETLIMITTEXT, 0, 0);
 837     if ( len > limit )
 838     {
 839         limit = len + 0x8000;    // 32Kb
 840
 841 #if wxUSE_RICHEDIT
 842         if ( m_isRich || limit > 0xffff )
 843 #else
 844         if ( limit > 0xffff )
 845 #endif
 846             ::SendMessage(GetHwnd(), EM_LIMITTEXT, 0, limit);
 847         else
 848             ::SendMessage(GetHwnd(), EM_LIMITTEXT, limit, 0);
 849     }
 850 #endif
 851 }
 852
 853 bool wxTextCtrl::AcceptsFocus() const
 854 {
 855     // we don't want focus if we can't be edited
 856     return IsEditable() && wxControl::AcceptsFocus();
 857 }
 858
 859 wxSize wxTextCtrl::DoGetBestSize()
 860 {
 861     int cx, cy;
 862     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 863
 864     int wText = DEFAULT_ITEM_WIDTH;
 865
 866     int hText = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 867     if ( m_windowStyle & wxTE_MULTILINE )
 868     {
 869         hText *= wxMin(GetNumberOfLines(), 5);
 870     }
 871     //else: for single line control everything is ok
 872
 873     return wxSize(wText, hText);
 874 }
 875
 876 // ----------------------------------------------------------------------------
 877 // standard handlers for standard edit menu events
 878 // ----------------------------------------------------------------------------
 879
 880 void wxTextCtrl::OnCut(wxCommandEvent& event)
 881 {
 882     Cut();
 883 }
 884
 885 void wxTextCtrl::OnCopy(wxCommandEvent& event)
 886 {
 887     Copy();
 888 }
 889
 890 void wxTextCtrl::OnPaste(wxCommandEvent& event)
 891 {
 892     Paste();
 893 }
 894
 895 void wxTextCtrl::OnUndo(wxCommandEvent& event)
 896 {
 897     Undo();
 898 }
 899
 900 void wxTextCtrl::OnRedo(wxCommandEvent& event)
 901 {
 902     Redo();
 903 }
 904
 905 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
 906 {
 907     event.Enable( CanCut() );
 908 }
 909
 910 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
 911 {
 912     event.Enable( CanCopy() );
 913 }
 914
 915 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
 916 {
 917     event.Enable( CanPaste() );
 918 }
 919
 920 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
 921 {
 922     event.Enable( CanUndo() );
 923 }
 924
 925 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
 926 {
 927     event.Enable( CanRedo() );
 928 }
 929