src/msw/textctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/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/intl.h"
  37     #include "wx/log.h"
  38     #include "wx/app.h"
  39 #endif
  40
  41 #if wxUSE_CLIPBOARD
  42     #include "wx/clipbrd.h"
  43 #endif
  44
  45 #include "wx/textfile.h"
  46
  47 #include <windowsx.h>
  48
  49 #include "wx/msw/private.h"
  50
  51 #include <string.h>
  52 #include <stdlib.h>
  53 #include <sys/types.h>
  54
  55 #if wxUSE_IOSTREAMH
  56 #   include <fstream.h>
  57 #else
  58 #   include <fstream>
  59 #endif
  60
  61 #if wxUSE_RICHEDIT && !defined(__GNUWIN32_OLD__)
  62     #include <richedit.h>
  63 #endif
  64
  65 // ----------------------------------------------------------------------------
  66 // private classes
  67 // ----------------------------------------------------------------------------
  68
  69 #if wxUSE_RICHEDIT
  70
  71 // this module initializes RichEdit DLL if needed
  72 class wxRichEditModule : public wxModule
  73 {
  74 public:
  75     virtual bool OnInit();
  76     virtual void OnExit();
  77
  78     // get the version currently loaded, -1 if none
  79     static int GetLoadedVersion() { return ms_verRichEdit; }
  80
  81     // load the richedit DLL of at least of required version
  82     static bool Load(int version = 1);
  83
  84 private:
  85     // the handle to richedit DLL and the version of the DLL loaded
  86     static HINSTANCE ms_hRichEdit;
  87
  88     // the DLL version loaded or -1 if none
  89     static int ms_verRichEdit;
  90
  91     DECLARE_DYNAMIC_CLASS(wxRichEditModule)
  92 };
  93
  94 HINSTANCE wxRichEditModule::ms_hRichEdit = (HINSTANCE)NULL;
  95 int       wxRichEditModule::ms_verRichEdit = -1;
  96
  97 IMPLEMENT_DYNAMIC_CLASS(wxRichEditModule, wxModule)
  98
  99 #endif // wxUSE_RICHEDIT
 100
 101 // ----------------------------------------------------------------------------
 102 // event tables and other macros
 103 // ----------------------------------------------------------------------------
 104
 105 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
 106
 107 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
 108     EVT_CHAR(wxTextCtrl::OnChar)
 109     EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
 110
 111     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
 112     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
 113     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
 114     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
 115     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
 116
 117     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
 118     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
 119     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
 120     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
 121     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
 122 END_EVENT_TABLE()
 123
 124
 125 // ============================================================================
 126 // implementation
 127 // ============================================================================
 128
 129 // ----------------------------------------------------------------------------
 130 // creation
 131 // ----------------------------------------------------------------------------
 132
 133 wxTextCtrl::wxTextCtrl()
 134 {
 135 #if wxUSE_RICHEDIT
 136     m_isRich = FALSE;
 137 #endif
 138 }
 139
 140 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
 141                         const wxString& value,
 142                         const wxPoint& pos,
 143                         const wxSize& size,
 144                         long style,
 145                         const wxValidator& validator,
 146                         const wxString& name)
 147 {
 148     // base initialization
 149     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
 150         return FALSE;
 151
 152     if ( parent )
 153         parent->AddChild(this);
 154
 155     // translate wxWin style flags to MSW ones, checking for consistency while
 156     // doing it
 157     long msStyle = ES_LEFT | WS_VISIBLE | WS_CHILD | WS_TABSTOP;
 158     if ( m_windowStyle & wxTE_MULTILINE )
 159     {
 160         wxASSERT_MSG( !(m_windowStyle & wxTE_PROCESS_ENTER),
 161                       wxT("wxTE_PROCESS_ENTER style is ignored for multiline "
 162                           "text controls (they always process it)") );
 163
 164         msStyle |= ES_MULTILINE | ES_WANTRETURN;
 165         if ((m_windowStyle & wxTE_NO_VSCROLL) == 0)
 166             msStyle |= WS_VSCROLL;
 167         m_windowStyle |= wxTE_PROCESS_ENTER;
 168     }
 169     else
 170         msStyle |= ES_AUTOHSCROLL;
 171
 172     if (m_windowStyle & wxHSCROLL)
 173         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 174
 175     if (m_windowStyle & wxTE_READONLY)
 176         msStyle |= ES_READONLY;
 177
 178     if (m_windowStyle & wxTE_PASSWORD) // hidden input
 179         msStyle |= ES_PASSWORD;
 180
 181    if (m_windowStyle & wxTE_AUTO_SCROLL)
 182         msStyle |=  ES_AUTOHSCROLL;
 183
 184
 185     // we always want the characters and the arrows
 186     m_lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;
 187
 188     // we may have several different cases:
 189     // 1. normal case: both TAB and ENTER are used for dialog navigation
 190     // 2. ctrl which wants TAB for itself: ENTER is used to pass to the next
 191     //    control in the dialog
 192     // 3. ctrl which wants ENTER for itself: TAB is used for dialog navigation
 193     // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to pass to
 194     //    the next control
 195     if ( m_windowStyle & wxTE_PROCESS_ENTER )
 196         m_lDlgCode |= DLGC_WANTMESSAGE;
 197     if ( m_windowStyle & wxTE_PROCESS_TAB )
 198         m_lDlgCode |= DLGC_WANTTAB;
 199
 200     // do create the control - either an EDIT or RICHEDIT
 201     wxString windowClass = wxT("EDIT");
 202
 203 #if wxUSE_RICHEDIT
 204     if ( m_windowStyle & wxTE_RICH )
 205     {
 206         static bool s_errorGiven = FALSE;   // MT-FIXME
 207
 208         // only give the error msg once if the DLL can't be loaded
 209         if ( !s_errorGiven )
 210         {
 211             // first try to load the RichEdit DLL (will do nothing if already
 212             // done)
 213             if ( !wxRichEditModule::Load() )
 214             {
 215                 wxLogError(_("Impossible to create a rich edit control, "
 216                              "using simple text control instead. Please "
 217                              "reinstall riched32.dll"));
 218
 219                 s_errorGiven = TRUE;
 220             }
 221         }
 222
 223         if ( s_errorGiven )
 224         {
 225             m_isRich = FALSE;
 226         }
 227         else
 228         {
 229             msStyle |= ES_AUTOVSCROLL;
 230             m_isRich = TRUE;
 231
 232             int ver = wxRichEditModule::GetLoadedVersion();
 233             if ( ver == 1 )
 234             {
 235                 windowClass = wxT("RICHEDIT");
 236             }
 237             else
 238             {
 239 #ifndef RICHEDIT_CLASS
 240                 wxString RICHEDIT_CLASS;
 241                 RICHEDIT_CLASS.Printf(_T("RichEdit%d0"), ver);
 242 #if wxUSE_UNICODE
 243                 RICHEDIT_CLASS += _T('W');
 244 #else // ANSI
 245                 RICHEDIT_CLASS += _T('A');
 246 #endif // Unicode/ANSI
 247 #endif // !RICHEDIT_CLASS
 248
 249                 windowClass = RICHEDIT_CLASS;
 250             }
 251         }
 252     }
 253     else
 254         m_isRich = FALSE;
 255 #endif // wxUSE_RICHEDIT
 256
 257     bool want3D;
 258     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 259
 260     // Even with extended styles, need to combine with WS_BORDER for them to
 261     // look right.
 262     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 263         msStyle |= WS_BORDER;
 264
 265     // NB: don't use pos and size as CreateWindowEx arguments because they
 266     //     might be -1 in which case we should use the default values (and
 267     //     SetSize called below takes care of it)
 268     m_hWnd = (WXHWND)::CreateWindowEx(exStyle,
 269                                       windowClass.c_str(),
 270                                       NULL,
 271                                       msStyle,
 272                                       0, 0, 0, 0,
 273                                       GetHwndOf(parent),
 274                                       (HMENU)m_windowId,
 275                                       wxGetInstance(),
 276                                       NULL);
 277
 278     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create text ctrl") );
 279
 280 #if wxUSE_CTL3D
 281     if ( want3D )
 282     {
 283         Ctl3dSubclassCtl(GetHwnd());
 284         m_useCtl3D = TRUE;
 285     }
 286 #endif
 287
 288 #if wxUSE_RICHEDIT
 289     if (m_isRich)
 290     {
 291         // Have to enable events
 292         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0,
 293                       ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 294     }
 295 #endif
 296
 297     SubclassWin(GetHWND());
 298
 299     // set font, position, size and initial value
 300     wxFont& fontParent = parent->GetFont();
 301     if ( fontParent.Ok() )
 302     {
 303         SetFont(fontParent);
 304     }
 305     else
 306     {
 307         SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 308     }
 309
 310     // Causes a crash for Symantec C++ and WIN32 for some reason
 311 #if !(defined(__SC__) && defined(__WIN32__))
 312     if ( !value.IsEmpty() )
 313     {
 314         SetValue(value);
 315     }
 316 #endif
 317
 318     // set colours
 319     SetupColours();
 320
 321     SetSize(pos.x, pos.y, size.x, size.y);
 322
 323     return TRUE;
 324 }
 325
 326 // Make sure the window style (etc.) reflects the HWND style (roughly)
 327 void wxTextCtrl::AdoptAttributesFromHWND()
 328 {
 329   wxWindow::AdoptAttributesFromHWND();
 330
 331   HWND hWnd = GetHwnd();
 332   long style = GetWindowLong(hWnd, GWL_STYLE);
 333
 334   // retrieve the style to see whether this is an edit or richedit ctrl
 335 #if wxUSE_RICHEDIT
 336   wxChar buf[256];
 337
 338   GetClassName(hWnd, buf, WXSIZEOF(buf));
 339
 340   if ( wxStricmp(buf, wxT("EDIT")) == 0 )
 341     m_isRich = FALSE;
 342   else
 343     m_isRich = TRUE;
 344 #endif // wxUSE_RICHEDIT
 345
 346   if (style & ES_MULTILINE)
 347     m_windowStyle |= wxTE_MULTILINE;
 348   if (style & ES_PASSWORD)
 349     m_windowStyle |= wxTE_PASSWORD;
 350   if (style & ES_READONLY)
 351     m_windowStyle |= wxTE_READONLY;
 352   if (style & ES_WANTRETURN)
 353     m_windowStyle |= wxTE_PROCESS_ENTER;
 354 }
 355
 356 void wxTextCtrl::SetupColours()
 357 {
 358     wxColour bkgndColour;
 359     if (IsEditable() || (m_windowStyle & wxTE_MULTILINE))
 360         bkgndColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW);
 361     else
 362         bkgndColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
 363
 364     SetBackgroundColour(bkgndColour);
 365     SetForegroundColour(GetParent()->GetForegroundColour());
 366 }
 367
 368 // ----------------------------------------------------------------------------
 369 // set/get the controls text
 370 // ----------------------------------------------------------------------------
 371
 372 wxString wxTextCtrl::GetValue() const
 373 {
 374     // we can't use wxGetWindowText() (i.e. WM_GETTEXT internally) for
 375     // retrieving more than 64Kb under Win9x
 376 #if wxUSE_RICHEDIT
 377     if ( m_isRich )
 378     {
 379         int len = GetWindowTextLength(GetHwnd()) + 1;
 380
 381         wxString str;
 382         wxChar *p = str.GetWriteBuf(len);
 383
 384         TEXTRANGE textRange;
 385         textRange.chrg.cpMin = 0;
 386         textRange.chrg.cpMax = -1;
 387         textRange.lpstrText = p;
 388
 389         (void)SendMessage(GetHwnd(), EM_GETTEXTRANGE, 0, (LPARAM)&textRange);
 390
 391         // believe it or not, but EM_GETTEXTRANGE uses just CR ('\r') for the
 392         // newlines which is neither Unix nor Windows style (Win95 with
 393         // riched20.dll shows this behaviour) - convert it to something
 394         // reasonable
 395         for ( ; *p; p++ )
 396         {
 397             if ( *p == _T('\r') )
 398                 *p = _T('\n');
 399         }
 400
 401         str.UngetWriteBuf();
 402
 403         return str;
 404     }
 405 #endif // wxUSE_RICHEDIT
 406
 407     // WM_GETTEXT uses standard DOS CR+LF (\r\n) convention - convert to the
 408     // same one as above for consitency
 409     wxString str = wxGetWindowText(GetHWND());
 410
 411     return wxTextFile::Translate(str, wxTextFileType_Unix);
 412 }
 413
 414 void wxTextCtrl::SetValue(const wxString& value)
 415 {
 416     // if the text is long enough, it's faster to just set it instead of first
 417     // comparing it with the old one (chances are that it will be different
 418     // anyhow, this comparison is there to avoid flicker for small single-line
 419     // edit controls mostly)
 420     if ( (value.length() > 0x400) || (value != GetValue()) )
 421     {
 422         wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 423
 424         SetWindowText(GetHwnd(), valueDos.c_str());
 425
 426         AdjustSpaceLimit();
 427     }
 428 }
 429
 430 void wxTextCtrl::WriteText(const wxString& value)
 431 {
 432     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 433
 434     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 435
 436     AdjustSpaceLimit();
 437 }
 438
 439 void wxTextCtrl::AppendText(const wxString& text)
 440 {
 441     SetInsertionPointEnd();
 442     WriteText(text);
 443 }
 444
 445 void wxTextCtrl::Clear()
 446 {
 447     SetWindowText(GetHwnd(), wxT(""));
 448 }
 449
 450 // ----------------------------------------------------------------------------
 451 // Clipboard operations
 452 // ----------------------------------------------------------------------------
 453
 454 void wxTextCtrl::Copy()
 455 {
 456     if (CanCopy())
 457     {
 458         HWND hWnd = GetHwnd();
 459         SendMessage(hWnd, WM_COPY, 0, 0L);
 460     }
 461 }
 462
 463 void wxTextCtrl::Cut()
 464 {
 465     if (CanCut())
 466     {
 467         HWND hWnd = GetHwnd();
 468         SendMessage(hWnd, WM_CUT, 0, 0L);
 469     }
 470 }
 471
 472 void wxTextCtrl::Paste()
 473 {
 474     if (CanPaste())
 475     {
 476         HWND hWnd = GetHwnd();
 477         SendMessage(hWnd, WM_PASTE, 0, 0L);
 478     }
 479 }
 480
 481 bool wxTextCtrl::CanCopy() const
 482 {
 483     // Can copy if there's a selection
 484     long from, to;
 485     GetSelection(& from, & to);
 486     return (from != to);
 487 }
 488
 489 bool wxTextCtrl::CanCut() const
 490 {
 491     // Can cut if there's a selection
 492     long from, to;
 493     GetSelection(& from, & to);
 494     return (from != to);
 495 }
 496
 497 bool wxTextCtrl::CanPaste() const
 498 {
 499 #if wxUSE_RICHEDIT
 500     if (m_isRich)
 501     {
 502         int dataFormat = 0; // 0 == any format
 503         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 504     }
 505 #endif
 506     if (!IsEditable())
 507         return FALSE;
 508
 509     // Standard edit control: check for straight text on clipboard
 510     bool isTextAvailable = FALSE;
 511     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 512     {
 513         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 514         ::CloseClipboard();
 515     }
 516
 517     return isTextAvailable;
 518 }
 519
 520 // ----------------------------------------------------------------------------
 521 // Accessors
 522 // ----------------------------------------------------------------------------
 523
 524 void wxTextCtrl::SetEditable(bool editable)
 525 {
 526     bool isEditable = IsEditable();
 527
 528     HWND hWnd = GetHwnd();
 529     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 530
 531     if (editable != isEditable)
 532     {
 533        SetupColours();
 534        Refresh();
 535     }
 536 }
 537
 538 void wxTextCtrl::SetInsertionPoint(long pos)
 539 {
 540     HWND hWnd = GetHwnd();
 541 #ifdef __WIN32__
 542 #if wxUSE_RICHEDIT
 543     if ( m_isRich)
 544     {
 545         CHARRANGE range;
 546         range.cpMin = pos;
 547         range.cpMax = pos;
 548         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 549         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 550     }
 551     else
 552 #endif // wxUSE_RICHEDIT
 553     {
 554         SendMessage(hWnd, EM_SETSEL, pos, pos);
 555         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 556     }
 557 #else // Win16
 558     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 559 #endif // Win32/16
 560
 561     static const wxChar *nothing = _T("");
 562     SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 563 }
 564
 565 void wxTextCtrl::SetInsertionPointEnd()
 566 {
 567     long pos = GetLastPosition();
 568     SetInsertionPoint(pos);
 569 }
 570
 571 long wxTextCtrl::GetInsertionPoint() const
 572 {
 573 #if wxUSE_RICHEDIT
 574     if (m_isRich)
 575     {
 576         CHARRANGE range;
 577         range.cpMin = 0;
 578         range.cpMax = 0;
 579         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 580         return range.cpMin;
 581     }
 582 #endif
 583
 584     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 585     return Pos & 0xFFFF;
 586 }
 587
 588 long wxTextCtrl::GetLastPosition() const
 589 {
 590     HWND hWnd = GetHwnd();
 591
 592     // Will always return a number > 0 (according to docs)
 593     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 594
 595     // This gets the char index for the _beginning_ of the last line
 596     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 597
 598     // Get number of characters in the last line. We'll add this to the character
 599     // index for the last line, 1st position.
 600     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 601
 602     return (long)(charIndex + lineLength);
 603 }
 604
 605 // If the return values from and to are the same, there is no
 606 // selection.
 607 void wxTextCtrl::GetSelection(long* from, long* to) const
 608 {
 609 #if wxUSE_RICHEDIT
 610     if (m_isRich)
 611     {
 612         CHARRANGE charRange;
 613         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 614
 615         *from = charRange.cpMin;
 616         *to = charRange.cpMax;
 617
 618         return;
 619     }
 620 #endif
 621     DWORD dwStart, dwEnd;
 622     WPARAM wParam = (WPARAM) (DWORD*) & dwStart; // receives starting position
 623     LPARAM lParam = (LPARAM) (DWORD*) & dwEnd;   // receives ending position
 624
 625     ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 626
 627     *from = dwStart;
 628     *to = dwEnd;
 629 }
 630
 631 bool wxTextCtrl::IsEditable() const
 632 {
 633     long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);
 634
 635     return ((style & ES_READONLY) == 0);
 636 }
 637
 638 // ----------------------------------------------------------------------------
 639 // Editing
 640 // ----------------------------------------------------------------------------
 641
 642 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 643 {
 644 #if wxUSE_CLIPBOARD
 645     HWND hWnd = GetHwnd();
 646     long fromChar = from;
 647     long toChar = to;
 648
 649     // Set selection and remove it
 650 #ifdef __WIN32__
 651     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 652 #else
 653     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 654 #endif
 655     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 656
 657     // Now replace with 'value', by pasting.
 658     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const wxChar *)value, 0, 0);
 659
 660     // Paste into edit control
 661     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 662 #else
 663     wxFAIL_MSG("wxTextCtrl::Replace not implemented if wxUSE_CLIPBOARD is 0.");
 664 #endif
 665 }
 666
 667 void wxTextCtrl::Remove(long from, long to)
 668 {
 669     HWND hWnd = GetHwnd();
 670     long fromChar = from;
 671     long toChar = to;
 672
 673     // Cut all selected text
 674 #ifdef __WIN32__
 675     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 676 #else
 677     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 678 #endif
 679     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 680 }
 681
 682 void wxTextCtrl::SetSelection(long from, long to)
 683 {
 684     HWND hWnd = GetHwnd();
 685     long fromChar = from;
 686     long toChar = to;
 687
 688     // if from and to are both -1, it means (in wxWindows) that all text should
 689     // be selected. Translate into Windows convention
 690     if ((from == -1) && (to == -1))
 691     {
 692       fromChar = 0;
 693       toChar = -1;
 694     }
 695
 696 #ifdef __WIN32__
 697     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 698     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 699 #else
 700     // WPARAM is 0: selection is scrolled into view
 701     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 702 #endif
 703 }
 704
 705 bool wxTextCtrl::LoadFile(const wxString& file)
 706 {
 707     if ( wxTextCtrlBase::LoadFile(file) )
 708     {
 709         // update the size limit if needed
 710         AdjustSpaceLimit();
 711
 712         return TRUE;
 713     }
 714
 715     return FALSE;
 716 }
 717
 718 bool wxTextCtrl::IsModified() const
 719 {
 720     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 721 }
 722
 723 // Makes 'unmodified'
 724 void wxTextCtrl::DiscardEdits()
 725 {
 726     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 727 }
 728
 729 int wxTextCtrl::GetNumberOfLines() const
 730 {
 731     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 732 }
 733
 734 long wxTextCtrl::XYToPosition(long x, long y) const
 735 {
 736     HWND hWnd = GetHwnd();
 737
 738     // This gets the char index for the _beginning_ of this line
 739     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 740     return (long)(x + charIndex);
 741 }
 742
 743 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 744 {
 745     HWND hWnd = GetHwnd();
 746
 747     // This gets the line number containing the character
 748     int lineNo;
 749 #if wxUSE_RICHEDIT
 750     if ( m_isRich )
 751     {
 752         lineNo = (int)SendMessage(hWnd, EM_EXLINEFROMCHAR, 0, (LPARAM)pos);
 753     }
 754     else
 755 #endif // wxUSE_RICHEDIT
 756         lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, 0);
 757
 758     if ( lineNo == -1 )
 759     {
 760         // no such line
 761         return FALSE;
 762     }
 763
 764     // This gets the char index for the _beginning_ of this line
 765     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 766     if ( charIndex == -1 )
 767     {
 768         return FALSE;
 769     }
 770
 771     // The X position must therefore be the different between pos and charIndex
 772     if ( x )
 773         *x = (long)(pos - charIndex);
 774     if ( y )
 775         *y = (long)lineNo;
 776
 777     return TRUE;
 778 }
 779
 780 void wxTextCtrl::ShowPosition(long pos)
 781 {
 782     HWND hWnd = GetHwnd();
 783
 784     // To scroll to a position, we pass the number of lines and characters
 785     // to scroll *by*. This means that we need to:
 786     // (1) Find the line position of the current line.
 787     // (2) Find the line position of pos.
 788     // (3) Scroll by (pos - current).
 789     // For now, ignore the horizontal scrolling.
 790
 791     // Is this where scrolling is relative to - the line containing the caret?
 792     // Or is the first visible line??? Try first visible line.
 793 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 794
 795     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 796
 797     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 798
 799     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 800
 801     if (linesToScroll != 0)
 802       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 803 }
 804
 805 int wxTextCtrl::GetLineLength(long lineNo) const
 806 {
 807     long charIndex = XYToPosition(0, lineNo);
 808     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 809     return len;
 810 }
 811
 812 wxString wxTextCtrl::GetLineText(long lineNo) const
 813 {
 814     // TODO this should probably be optimized by using GetWriteBuf()
 815
 816     size_t len = (size_t)GetLineLength(lineNo) + 1;
 817     if ( len < sizeof(WORD) )
 818     {
 819         // there must be at least enough place for the length WORD in the
 820         // buffer
 821         len += sizeof(WORD);
 822     }
 823
 824     char *buf = (char *)malloc(len);
 825     *(WORD *)buf = len;
 826     int noChars = (int)SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 827     buf[noChars] = 0;
 828
 829     wxString str(buf);
 830
 831     free(buf);
 832
 833     return str;
 834 }
 835
 836 // ----------------------------------------------------------------------------
 837 // Undo/redo
 838 // ----------------------------------------------------------------------------
 839
 840 void wxTextCtrl::Undo()
 841 {
 842     if (CanUndo())
 843     {
 844         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 845     }
 846 }
 847
 848 void wxTextCtrl::Redo()
 849 {
 850     if (CanRedo())
 851     {
 852         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 853         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 854     }
 855 }
 856
 857 bool wxTextCtrl::CanUndo() const
 858 {
 859     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 860 }
 861
 862 bool wxTextCtrl::CanRedo() const
 863 {
 864     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 865 }
 866
 867 // ----------------------------------------------------------------------------
 868 // implemenation details
 869 // ----------------------------------------------------------------------------
 870
 871 void wxTextCtrl::Command(wxCommandEvent & event)
 872 {
 873     SetValue(event.GetString());
 874     ProcessCommand (event);
 875 }
 876
 877 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 878 {
 879     // By default, load the first file into the text window.
 880     if (event.GetNumberOfFiles() > 0)
 881     {
 882         LoadFile(event.GetFiles()[0]);
 883     }
 884 }
 885
 886 void wxTextCtrl::OnChar(wxKeyEvent& event)
 887 {
 888     switch ( event.KeyCode() )
 889     {
 890         case WXK_RETURN:
 891             if ( !(m_windowStyle & wxTE_MULTILINE) )
 892             {
 893                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 894                 InitCommandEvent(event);
 895                 if ( GetEventHandler()->ProcessEvent(event) )
 896                     return;
 897             }
 898             //else: multiline controls need Enter for themselves
 899
 900             break;
 901
 902         case WXK_TAB:
 903             // always produce navigation event - even if we process TAB
 904             // ourselves the fact that we got here means that the user code
 905             // decided to skip processing of this TAB - probably to let it
 906             // do its default job.
 907             {
 908                 wxNavigationKeyEvent eventNav;
 909                 eventNav.SetDirection(!event.ShiftDown());
 910                 eventNav.SetWindowChange(event.ControlDown());
 911                 eventNav.SetEventObject(this);
 912
 913                 if ( GetParent()->GetEventHandler()->ProcessEvent(eventNav) )
 914                     return;
 915             }
 916             break;
 917     }
 918
 919     // no, we didn't process it
 920     event.Skip();
 921 }
 922
 923 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 924 {
 925     switch (param)
 926     {
 927         case EN_SETFOCUS:
 928         case EN_KILLFOCUS:
 929             {
 930                 wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
 931                         : wxEVT_SET_FOCUS,
 932                         m_windowId);
 933                 event.SetEventObject( this );
 934                 GetEventHandler()->ProcessEvent(event);
 935             }
 936             break;
 937
 938         case EN_CHANGE:
 939             {
 940                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
 941                 InitCommandEvent(event);
 942                 event.SetString(GetValue());
 943                 ProcessCommand(event);
 944             }
 945             break;
 946
 947         case EN_MAXTEXT:
 948             // the text size limit has been hit - increase it
 949             AdjustSpaceLimit();
 950             break;
 951
 952             // the other notification messages are not processed
 953         case EN_UPDATE:
 954         case EN_ERRSPACE:
 955         case EN_HSCROLL:
 956         case EN_VSCROLL:
 957         default:
 958             return FALSE;
 959     }
 960
 961     // processed
 962     return TRUE;
 963 }
 964
 965 void wxTextCtrl::AdjustSpaceLimit()
 966 {
 967 #ifndef __WIN16__
 968     unsigned int len = ::GetWindowTextLength(GetHwnd()),
 969     limit = ::SendMessage(GetHwnd(), EM_GETLIMITTEXT, 0, 0);
 970     if ( len >= limit )
 971     {
 972         limit = len + 0x8000;    // 32Kb
 973
 974 #if wxUSE_RICHEDIT
 975         if ( m_isRich )
 976         {
 977             // as a nice side effect, this also allows passing limit > 64Kb
 978             ::SendMessage(GetHwnd(), EM_EXLIMITTEXT, 0, limit);
 979         }
 980         else
 981 #endif // wxUSE_RICHEDIT
 982         {
 983             if ( limit > 0xffff )
 984             {
 985                 // this will set it to a platform-dependent maximum (much more
 986                 // than 64Kb under NT)
 987                 limit = 0;
 988             }
 989
 990             ::SendMessage(GetHwnd(), EM_LIMITTEXT, limit, 0);
 991         }
 992     }
 993 #endif // !Win16
 994 }
 995
 996 bool wxTextCtrl::AcceptsFocus() const
 997 {
 998     // we don't want focus if we can't be edited
 999     return IsEditable() && wxControl::AcceptsFocus();
1000 }
1001
1002 wxSize wxTextCtrl::DoGetBestSize() const
1003 {
1004     int cx, cy;
1005     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
1006
1007     int wText = DEFAULT_ITEM_WIDTH;
1008
1009     int hText = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
1010     if ( m_windowStyle & wxTE_MULTILINE )
1011     {
1012         hText *= wxMin(GetNumberOfLines(), 5);
1013     }
1014     //else: for single line control everything is ok
1015
1016     return wxSize(wText, hText);
1017 }
1018
1019 // ----------------------------------------------------------------------------
1020 // standard handlers for standard edit menu events
1021 // ----------------------------------------------------------------------------
1022
1023 void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
1024 {
1025     Cut();
1026 }
1027
1028 void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
1029 {
1030     Copy();
1031 }
1032
1033 void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
1034 {
1035     Paste();
1036 }
1037
1038 void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
1039 {
1040     Undo();
1041 }
1042
1043 void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
1044 {
1045     Redo();
1046 }
1047
1048 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
1049 {
1050     event.Enable( CanCut() );
1051 }
1052
1053 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
1054 {
1055     event.Enable( CanCopy() );
1056 }
1057
1058 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
1059 {
1060     event.Enable( CanPaste() );
1061 }
1062
1063 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
1064 {
1065     event.Enable( CanUndo() );
1066 }
1067
1068 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
1069 {
1070     event.Enable( CanRedo() );
1071 }
1072
1073 // ----------------------------------------------------------------------------
1074 // wxRichEditModule
1075 // ----------------------------------------------------------------------------
1076
1077 #if wxUSE_RICHEDIT
1078
1079 bool wxRichEditModule::OnInit()
1080 {
1081     // don't do anything - we will load it when needed
1082     return TRUE;
1083 }
1084
1085 void wxRichEditModule::OnExit()
1086 {
1087     if ( ms_hRichEdit )
1088     {
1089         FreeLibrary(ms_hRichEdit);
1090     }
1091 }
1092
1093 /* static */
1094 bool wxRichEditModule::Load(int version)
1095 {
1096     wxCHECK_MSG( version >= 1 && version <= 3, FALSE,
1097                  _T("incorrect richedit control version requested") );
1098
1099     if ( version <= ms_verRichEdit )
1100     {
1101         // we've already got this or better
1102         return TRUE;
1103     }
1104
1105     if ( ms_hRichEdit )
1106     {
1107         ::FreeLibrary(ms_hRichEdit);
1108     }
1109
1110     // always try load riched20.dll first - like this we won't have to reload
1111     // it later if we're first asked for RE 1 and then for RE 2 or 3
1112     wxString dllname = _T("riched20.dll");
1113     ms_hRichEdit = ::LoadLibrary(dllname);
1114     ms_verRichEdit = 2; // no way to tell if it's 2 or 3, assume 2
1115
1116     if ( !ms_hRichEdit && (version == 1) )
1117     {
1118         // fall back to RE 1
1119         dllname = _T("riched32.dll");
1120         ms_hRichEdit = ::LoadLibrary(dllname);
1121         ms_verRichEdit = 1;
1122     }
1123
1124     if ( !ms_hRichEdit )
1125     {
1126         wxLogSysError(_("Could not load Rich Edit DLL '%s'"), dllname.c_str());
1127
1128         ms_verRichEdit = -1;
1129
1130         return FALSE;
1131     }
1132
1133     return TRUE;
1134 }
1135
1136 #endif // wxUSE_RICHEDIT
1137