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