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