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 #if wxUSE_TEXTCTRL
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/textctrl.h"
  35     #include "wx/settings.h"
  36     #include "wx/brush.h"
  37     #include "wx/utils.h"
  38     #include "wx/intl.h"
  39     #include "wx/log.h"
  40     #include "wx/app.h"
  41 #endif
  42
  43 #include "wx/module.h"
  44
  45 #if wxUSE_CLIPBOARD
  46     #include "wx/clipbrd.h"
  47 #endif
  48
  49 #include "wx/textfile.h"
  50
  51 #include <windowsx.h>
  52
  53 #include "wx/msw/private.h"
  54
  55 #include <string.h>
  56 #include <stdlib.h>
  57 #include <sys/types.h>
  58
  59 #if wxUSE_RICHEDIT && (!defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__))
  60     #include <richedit.h>
  61 #endif
  62
  63 // old mingw32 doesn't define this
  64 #ifndef CFM_CHARSET
  65     #define CFM_CHARSET 0x08000000
  66 #endif // CFM_CHARSET
  67
  68 #ifndef CFM_BACKCOLOR
  69     #define CFM_BACKCOLOR 0x04000000
  70 #endif
  71
  72 // cygwin does not have these defined for richedit
  73 #ifndef ENM_LINK
  74     #define ENM_LINK 0x04000000
  75 #endif
  76
  77 #ifndef EM_AUTOURLDETECT
  78     #define EM_AUTOURLDETECT (WM_USER + 91)
  79 #endif
  80
  81 #ifndef EN_LINK
  82     #define EN_LINK 0x070b
  83
  84     typedef struct _enlink
  85     {
  86         NMHDR nmhdr;
  87         UINT msg;
  88         WPARAM wParam;
  89         LPARAM lParam;
  90         CHARRANGE chrg;
  91     } ENLINK;
  92 #endif // ENLINK
  93
  94 // ----------------------------------------------------------------------------
  95 // private classes
  96 // ----------------------------------------------------------------------------
  97
  98 #if wxUSE_RICHEDIT
  99
 100 // this module initializes RichEdit DLL if needed
 101 class wxRichEditModule : public wxModule
 102 {
 103 public:
 104     virtual bool OnInit();
 105     virtual void OnExit();
 106
 107     // get the version currently loaded, -1 if none
 108     static int GetLoadedVersion() { return ms_verRichEdit; }
 109
 110     // load the richedit DLL of at least of required version
 111     static bool Load(int version = 1);
 112
 113 private:
 114     // the handle to richedit DLL and the version of the DLL loaded
 115     static HINSTANCE ms_hRichEdit;
 116
 117     // the DLL version loaded or -1 if none
 118     static int ms_verRichEdit;
 119
 120     DECLARE_DYNAMIC_CLASS(wxRichEditModule)
 121 };
 122
 123 HINSTANCE wxRichEditModule::ms_hRichEdit = (HINSTANCE)NULL;
 124 int       wxRichEditModule::ms_verRichEdit = -1;
 125
 126 IMPLEMENT_DYNAMIC_CLASS(wxRichEditModule, wxModule)
 127
 128 #endif // wxUSE_RICHEDIT
 129
 130 // ----------------------------------------------------------------------------
 131 // event tables and other macros
 132 // ----------------------------------------------------------------------------
 133
 134 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
 135
 136 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
 137     EVT_CHAR(wxTextCtrl::OnChar)
 138     EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
 139
 140     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
 141     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
 142     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
 143     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
 144     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
 145
 146     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
 147     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
 148     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
 149     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
 150     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
 151 #ifdef __WIN16__
 152     EVT_ERASE_BACKGROUND(wxTextCtrl::OnEraseBackground)
 153 #endif
 154 END_EVENT_TABLE()
 155
 156 // ============================================================================
 157 // implementation
 158 // ============================================================================
 159
 160 // ----------------------------------------------------------------------------
 161 // creation
 162 // ----------------------------------------------------------------------------
 163
 164 wxTextCtrl::wxTextCtrl()
 165 {
 166 #if wxUSE_RICHEDIT
 167     m_isRich = FALSE;
 168 #endif
 169 }
 170
 171 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
 172                         const wxString& value,
 173                         const wxPoint& pos,
 174                         const wxSize& size,
 175                         long style,
 176                         const wxValidator& validator,
 177                         const wxString& name)
 178 {
 179     // base initialization
 180     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
 181         return FALSE;
 182
 183     if ( parent )
 184         parent->AddChild(this);
 185
 186     // translate wxWin style flags to MSW ones, checking for consistency while
 187     // doing it
 188     long msStyle = ES_LEFT | WS_TABSTOP;
 189
 190     if ( m_windowStyle & wxCLIP_SIBLINGS )
 191         msStyle |= WS_CLIPSIBLINGS;
 192
 193     if ( m_windowStyle & wxTE_MULTILINE )
 194     {
 195         wxASSERT_MSG( !(m_windowStyle & wxTE_PROCESS_ENTER),
 196                       wxT("wxTE_PROCESS_ENTER style is ignored for multiline text controls (they always process it)") );
 197
 198         msStyle |= ES_MULTILINE | ES_WANTRETURN;
 199         if ((m_windowStyle & wxTE_NO_VSCROLL) == 0)
 200             msStyle |= WS_VSCROLL;
 201         m_windowStyle |= wxTE_PROCESS_ENTER;
 202     }
 203     else // !multiline
 204     {
 205         // there is really no reason to not have this style for single line
 206         // text controls
 207         msStyle |= ES_AUTOHSCROLL;
 208     }
 209
 210     if ( m_windowStyle & wxHSCROLL )
 211         msStyle |= WS_HSCROLL | ES_AUTOHSCROLL;
 212
 213     if ( m_windowStyle & wxTE_READONLY )
 214         msStyle |= ES_READONLY;
 215
 216     if ( m_windowStyle & wxTE_PASSWORD )
 217         msStyle |= ES_PASSWORD;
 218
 219     if ( m_windowStyle & wxTE_AUTO_SCROLL )
 220         msStyle |= ES_AUTOHSCROLL;
 221
 222     if ( m_windowStyle & wxTE_NOHIDESEL )
 223         msStyle |= ES_NOHIDESEL;
 224
 225     // we always want the characters and the arrows
 226     m_lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;
 227
 228     // we may have several different cases:
 229     // 1. normal case: both TAB and ENTER are used for dialog navigation
 230     // 2. ctrl which wants TAB for itself: ENTER is used to pass to the next
 231     //    control in the dialog
 232     // 3. ctrl which wants ENTER for itself: TAB is used for dialog navigation
 233     // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to pass to
 234     //    the next control
 235     if ( m_windowStyle & wxTE_PROCESS_ENTER )
 236         m_lDlgCode |= DLGC_WANTMESSAGE;
 237     if ( m_windowStyle & wxTE_PROCESS_TAB )
 238         m_lDlgCode |= DLGC_WANTTAB;
 239
 240     // do create the control - either an EDIT or RICHEDIT
 241     wxString windowClass = wxT("EDIT");
 242
 243 #if wxUSE_RICHEDIT
 244     if ( m_windowStyle & wxTE_RICH )
 245     {
 246         static bool s_errorGiven = FALSE;   // MT-FIXME
 247
 248         // only give the error msg once if the DLL can't be loaded
 249         if ( !s_errorGiven )
 250         {
 251             // first try to load the RichEdit DLL (will do nothing if already
 252             // done)
 253             if ( !wxRichEditModule::Load() )
 254             {
 255                 wxLogError(_("Impossible to create a rich edit control, using simple text control instead. Please reinstall riched32.dll"));
 256
 257                 s_errorGiven = TRUE;
 258             }
 259         }
 260
 261         if ( s_errorGiven )
 262         {
 263             m_isRich = FALSE;
 264         }
 265         else
 266         {
 267             msStyle |= ES_AUTOVSCROLL;
 268             // Experimental: this seems to help with the scroll problem. See messages from Jekabs Andrushaitis <j.andrusaitis@konts.lv>
 269             // wx-dev list, entitled "[wx-dev] wxMSW-EVT_KEY_DOWN and wxMSW-wxTextCtrl" and "[wx-dev] TextCtrl (RichEdit)"
 270             // Unfortunately, showing the selection in blue when the control doesn't have
 271             // the focus is non-standard behaviour, and we need to find another workaround.
 272             //msStyle |= ES_NOHIDESEL ;
 273             m_isRich = TRUE;
 274
 275             int ver = wxRichEditModule::GetLoadedVersion();
 276             if ( ver == 1 )
 277             {
 278                 windowClass = wxT("RICHEDIT");
 279             }
 280             else
 281             {
 282 #ifndef RICHEDIT_CLASS
 283                 wxString RICHEDIT_CLASS;
 284                 RICHEDIT_CLASS.Printf(_T("RichEdit%d0"), ver);
 285 #if wxUSE_UNICODE
 286                 RICHEDIT_CLASS += _T('W');
 287 #else // ANSI
 288                 RICHEDIT_CLASS += _T('A');
 289 #endif // Unicode/ANSI
 290 #endif // !RICHEDIT_CLASS
 291
 292                 windowClass = RICHEDIT_CLASS;
 293             }
 294         }
 295     }
 296     else
 297         m_isRich = FALSE;
 298 #endif // wxUSE_RICHEDIT
 299
 300     if ( !MSWCreateControl(windowClass, msStyle, pos, size, value) )
 301         return FALSE;
 302
 303 #if wxUSE_RICHEDIT
 304     if (m_isRich)
 305     {
 306         // have to enable events manually
 307         LPARAM mask = ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE;
 308
 309         if ( m_windowStyle & wxTE_AUTO_URL )
 310         {
 311             mask |= ENM_LINK;
 312
 313             ::SendMessage(GetHwnd(), EM_AUTOURLDETECT, TRUE, 0);
 314         }
 315
 316         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0, mask);
 317     }
 318 #endif // wxUSE_RICHEDIT
 319
 320     return TRUE;
 321 }
 322
 323 // Make sure the window style (etc.) reflects the HWND style (roughly)
 324 void wxTextCtrl::AdoptAttributesFromHWND()
 325 {
 326   wxWindow::AdoptAttributesFromHWND();
 327
 328   HWND hWnd = GetHwnd();
 329   long style = GetWindowLong(hWnd, GWL_STYLE);
 330
 331   // retrieve the style to see whether this is an edit or richedit ctrl
 332 #if wxUSE_RICHEDIT
 333   wxChar buf[256];
 334
 335   GetClassName(hWnd, buf, WXSIZEOF(buf));
 336
 337   if ( wxStricmp(buf, wxT("EDIT")) == 0 )
 338     m_isRich = FALSE;
 339   else
 340     m_isRich = TRUE;
 341 #endif // wxUSE_RICHEDIT
 342
 343   if (style & ES_MULTILINE)
 344     m_windowStyle |= wxTE_MULTILINE;
 345   if (style & ES_PASSWORD)
 346     m_windowStyle |= wxTE_PASSWORD;
 347   if (style & ES_READONLY)
 348     m_windowStyle |= wxTE_READONLY;
 349   if (style & ES_WANTRETURN)
 350     m_windowStyle |= wxTE_PROCESS_ENTER;
 351 }
 352
 353 // ----------------------------------------------------------------------------
 354 // set/get the controls text
 355 // ----------------------------------------------------------------------------
 356
 357 wxString wxTextCtrl::GetValue() const
 358 {
 359     // we can't use wxGetWindowText() (i.e. WM_GETTEXT internally) for
 360     // retrieving more than 64Kb under Win9x
 361 #if wxUSE_RICHEDIT
 362     if ( m_isRich )
 363     {
 364         wxString str;
 365
 366         int len = GetWindowTextLength(GetHwnd());
 367         if ( len )
 368         {
 369             // alloc one extra WORD as needed by the control
 370             wxChar *p = str.GetWriteBuf(++len);
 371
 372             TEXTRANGE textRange;
 373             textRange.chrg.cpMin = 0;
 374             textRange.chrg.cpMax = -1;
 375             textRange.lpstrText = p;
 376
 377             (void)SendMessage(GetHwnd(), EM_GETTEXTRANGE, 0, (LPARAM)&textRange);
 378
 379             // believe it or not, but EM_GETTEXTRANGE uses just CR ('\r') for
 380             // the newlines which is neither Unix nor Windows style (Win95 with
 381             // riched20.dll shows this behaviour) - convert it to something
 382             // reasonable
 383             for ( ; *p; p++ )
 384             {
 385                 if ( *p == _T('\r') )
 386                     *p = _T('\n');
 387             }
 388
 389             str.UngetWriteBuf();
 390         }
 391         //else: no text at all, leave the string empty
 392
 393         return str;
 394     }
 395 #endif // wxUSE_RICHEDIT
 396
 397     // WM_GETTEXT uses standard DOS CR+LF (\r\n) convention - convert to the
 398     // same one as above for consitency
 399     wxString str = wxGetWindowText(GetHWND());
 400
 401     return wxTextFile::Translate(str, wxTextFileType_Unix);
 402 }
 403
 404 void wxTextCtrl::SetValue(const wxString& value)
 405 {
 406     // if the text is long enough, it's faster to just set it instead of first
 407     // comparing it with the old one (chances are that it will be different
 408     // anyhow, this comparison is there to avoid flicker for small single-line
 409     // edit controls mostly)
 410     if ( (value.length() > 0x400) || (value != GetValue()) )
 411     {
 412         wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 413
 414         SetWindowText(GetHwnd(), valueDos.c_str());
 415
 416         // for compatibility with the GTK and because it is more logical, we
 417         // move the cursor to the end of the text after SetValue()
 418
 419         // GRG, Jun/2000: Changed this back after a lot of discussion
 420         //   in the lists. wxWindows 2.2 will have a set of flags to
 421         //   customize this behaviour.
 422         //SetInsertionPointEnd();
 423
 424         AdjustSpaceLimit();
 425     }
 426 }
 427
 428 void wxTextCtrl::WriteText(const wxString& value)
 429 {
 430     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 431
 432 #if wxUSE_RICHEDIT
 433     // ensure that the new text will be in the default style
 434     if ( IsRich() &&
 435             (m_defaultStyle.HasFont() || m_defaultStyle.HasTextColour()) )
 436     {
 437         long start, end;
 438         GetSelection(&start, &end);
 439         SetStyle(start, end, m_defaultStyle );
 440     }
 441 #endif // wxUSE_RICHEDIT
 442
 443     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 444
 445     AdjustSpaceLimit();
 446 }
 447
 448 void wxTextCtrl::AppendText(const wxString& text)
 449 {
 450     SetInsertionPointEnd();
 451     WriteText(text);
 452 }
 453
 454 void wxTextCtrl::Clear()
 455 {
 456     SetWindowText(GetHwnd(), wxT(""));
 457 }
 458
 459 // ----------------------------------------------------------------------------
 460 // Clipboard operations
 461 // ----------------------------------------------------------------------------
 462
 463 void wxTextCtrl::Copy()
 464 {
 465     if (CanCopy())
 466     {
 467         HWND hWnd = GetHwnd();
 468         SendMessage(hWnd, WM_COPY, 0, 0L);
 469     }
 470 }
 471
 472 void wxTextCtrl::Cut()
 473 {
 474     if (CanCut())
 475     {
 476         HWND hWnd = GetHwnd();
 477         SendMessage(hWnd, WM_CUT, 0, 0L);
 478     }
 479 }
 480
 481 void wxTextCtrl::Paste()
 482 {
 483     if (CanPaste())
 484     {
 485         HWND hWnd = GetHwnd();
 486         SendMessage(hWnd, WM_PASTE, 0, 0L);
 487     }
 488 }
 489
 490 bool wxTextCtrl::CanCopy() const
 491 {
 492     // Can copy if there's a selection
 493     long from, to;
 494     GetSelection(& from, & to);
 495     return (from != to) ;
 496 }
 497
 498 bool wxTextCtrl::CanCut() const
 499 {
 500     // Can cut if there's a selection
 501     long from, to;
 502     GetSelection(& from, & to);
 503     return (from != to) && (IsEditable());
 504 }
 505
 506 bool wxTextCtrl::CanPaste() const
 507 {
 508 #if wxUSE_RICHEDIT
 509     if (m_isRich)
 510     {
 511         int dataFormat = 0; // 0 == any format
 512         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 513     }
 514 #endif
 515     if (!IsEditable())
 516         return FALSE;
 517
 518     // Standard edit control: check for straight text on clipboard
 519     bool isTextAvailable = FALSE;
 520     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 521     {
 522         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 523         ::CloseClipboard();
 524     }
 525
 526     return isTextAvailable;
 527 }
 528
 529 // ----------------------------------------------------------------------------
 530 // Accessors
 531 // ----------------------------------------------------------------------------
 532
 533 void wxTextCtrl::SetEditable(bool editable)
 534 {
 535     HWND hWnd = GetHwnd();
 536     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 537 }
 538
 539 void wxTextCtrl::SetInsertionPoint(long pos)
 540 {
 541     HWND hWnd = GetHwnd();
 542 #ifdef __WIN32__
 543 #if wxUSE_RICHEDIT
 544     if ( m_isRich)
 545     {
 546         CHARRANGE range;
 547         range.cpMin = pos;
 548         range.cpMax = pos;
 549         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 550         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 551     }
 552     else
 553 #endif // wxUSE_RICHEDIT
 554     {
 555         SendMessage(hWnd, EM_SETSEL, pos, pos);
 556         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 557     }
 558 #else // Win16
 559     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 560 #endif // Win32/16
 561
 562 #if wxUSE_RICHEDIT
 563     if ( !m_isRich)
 564 #endif
 565     {
 566         static const wxChar *nothing = _T("");
 567         SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 568     }
 569 }
 570
 571 void wxTextCtrl::SetInsertionPointEnd()
 572 {
 573     long pos = GetLastPosition();
 574     SetInsertionPoint(pos);
 575 }
 576
 577 long wxTextCtrl::GetInsertionPoint() const
 578 {
 579 #if wxUSE_RICHEDIT
 580     if (m_isRich)
 581     {
 582         CHARRANGE range;
 583         range.cpMin = 0;
 584         range.cpMax = 0;
 585         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 586         return range.cpMin;
 587     }
 588 #endif
 589
 590     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 591     return Pos & 0xFFFF;
 592 }
 593
 594 long wxTextCtrl::GetLastPosition() const
 595 {
 596     HWND hWnd = GetHwnd();
 597
 598     // Will always return a number > 0 (according to docs)
 599     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 600
 601     // This gets the char index for the _beginning_ of the last line
 602     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 603
 604     // Get number of characters in the last line. We'll add this to the character
 605     // index for the last line, 1st position.
 606     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 607
 608     return (long)(charIndex + lineLength);
 609 }
 610
 611 // If the return values from and to are the same, there is no
 612 // selection.
 613 void wxTextCtrl::GetSelection(long* from, long* to) const
 614 {
 615 #if wxUSE_RICHEDIT
 616     if (m_isRich)
 617     {
 618         CHARRANGE charRange;
 619         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 620
 621         *from = charRange.cpMin;
 622         *to = charRange.cpMax;
 623     }
 624     else
 625 #endif // rich/!rich
 626     {
 627         DWORD dwStart, dwEnd;
 628         WPARAM wParam = (WPARAM) &dwStart; // receives starting position
 629         LPARAM lParam = (LPARAM) &dwEnd;   // receives ending position
 630
 631         ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 632
 633         *from = dwStart;
 634         *to = dwEnd;
 635     }
 636 }
 637
 638 bool wxTextCtrl::IsEditable() const
 639 {
 640     long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);
 641
 642     return ((style & ES_READONLY) == 0);
 643 }
 644
 645 // ----------------------------------------------------------------------------
 646 // Editing
 647 // ----------------------------------------------------------------------------
 648
 649 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 650 {
 651     HWND hWnd = GetHwnd();
 652     long fromChar = from;
 653     long toChar = to;
 654
 655     // Set selection and remove it
 656 #ifdef __WIN32__
 657     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 658     SendMessage(hWnd, EM_REPLACESEL, (WPARAM)TRUE, (LPARAM)value.c_str());
 659 #else
 660     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 661     SendMessage(hWnd, EM_REPLACESEL, (WPARAM)0, (LPARAM)value.c_str());
 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     SendMessage(hWnd, EM_REPLACESEL, (WPARAM)TRUE, (LPARAM)"");
 675 #else
 676     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 677     SendMessage(hWnd, EM_REPLACESEL, (WPARAM)0, (LPARAM)"");
 678 #endif
 679 }
 680
 681 void wxTextCtrl::SetSelection(long from, long to)
 682 {
 683     HWND hWnd = GetHwnd();
 684     long fromChar = from;
 685     long toChar = to;
 686
 687     // if from and to are both -1, it means (in wxWindows) that all text should
 688     // be selected. Translate into Windows convention
 689     if ((from == -1) && (to == -1))
 690     {
 691       fromChar = 0;
 692       toChar = -1;
 693     }
 694
 695 #ifdef __WIN32__
 696     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 697     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 698 #else
 699     // WPARAM is 0: selection is scrolled into view
 700     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 701 #endif
 702 }
 703
 704 bool wxTextCtrl::LoadFile(const wxString& file)
 705 {
 706     if ( wxTextCtrlBase::LoadFile(file) )
 707     {
 708         // update the size limit if needed
 709         AdjustSpaceLimit();
 710
 711         return TRUE;
 712     }
 713
 714     return FALSE;
 715 }
 716
 717 bool wxTextCtrl::IsModified() const
 718 {
 719     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 720 }
 721
 722 // Makes 'unmodified'
 723 void wxTextCtrl::DiscardEdits()
 724 {
 725     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 726 }
 727
 728 int wxTextCtrl::GetNumberOfLines() const
 729 {
 730     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 731 }
 732
 733 long wxTextCtrl::XYToPosition(long x, long y) const
 734 {
 735     HWND hWnd = GetHwnd();
 736
 737     // This gets the char index for the _beginning_ of this line
 738     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 739     return (long)(x + charIndex);
 740 }
 741
 742 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 743 {
 744     HWND hWnd = GetHwnd();
 745
 746     // This gets the line number containing the character
 747     int lineNo;
 748 #if wxUSE_RICHEDIT
 749     if ( m_isRich )
 750     {
 751         lineNo = (int)SendMessage(hWnd, EM_EXLINEFROMCHAR, 0, (LPARAM)pos);
 752     }
 753     else
 754 #endif // wxUSE_RICHEDIT
 755         lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, 0);
 756
 757     if ( lineNo == -1 )
 758     {
 759         // no such line
 760         return FALSE;
 761     }
 762
 763     // This gets the char index for the _beginning_ of this line
 764     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 765     if ( charIndex == -1 )
 766     {
 767         return FALSE;
 768     }
 769
 770     // The X position must therefore be the different between pos and charIndex
 771     if ( x )
 772         *x = (long)(pos - charIndex);
 773     if ( y )
 774         *y = (long)lineNo;
 775
 776     return TRUE;
 777 }
 778
 779 void wxTextCtrl::ShowPosition(long pos)
 780 {
 781     HWND hWnd = GetHwnd();
 782
 783     // To scroll to a position, we pass the number of lines and characters
 784     // to scroll *by*. This means that we need to:
 785     // (1) Find the line position of the current line.
 786     // (2) Find the line position of pos.
 787     // (3) Scroll by (pos - current).
 788     // For now, ignore the horizontal scrolling.
 789
 790     // Is this where scrolling is relative to - the line containing the caret?
 791     // Or is the first visible line??? Try first visible line.
 792 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 793
 794     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 795
 796     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 797
 798     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 799
 800     if (linesToScroll != 0)
 801       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 802 }
 803
 804 int wxTextCtrl::GetLineLength(long lineNo) const
 805 {
 806     long charIndex = XYToPosition(0, lineNo);
 807     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 808     return len;
 809 }
 810
 811 wxString wxTextCtrl::GetLineText(long lineNo) const
 812 {
 813     size_t len = (size_t)GetLineLength(lineNo) + 1;
 814
 815     // there must be at least enough place for the length WORD in the
 816     // buffer
 817     len += sizeof(WORD);
 818
 819     wxString str;
 820     wxChar *buf = str.GetWriteBuf(len);
 821
 822     *(WORD *)buf = (WORD)len;
 823     len = (size_t)::SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 824     buf[len] = 0;
 825
 826     str.UngetWriteBuf(len);
 827
 828     return str;
 829 }
 830
 831 void wxTextCtrl::SetMaxLength(unsigned long len)
 832 {
 833     ::SendMessage(GetHwnd(), EM_LIMITTEXT, len, 0);
 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 // ----------------------------------------------------------------------------
 887 // kbd input processing
 888 // ----------------------------------------------------------------------------
 889
 890 bool wxTextCtrl::MSWShouldPreProcessMessage(WXMSG* pMsg)
 891 {
 892     MSG *msg = (MSG *)pMsg;
 893
 894     // check for our special keys here: if we don't do it and the parent frame
 895     // uses them as accelerators, they wouldn't work at all, so we disable
 896     // usual preprocessing for them
 897     if ( msg->message == WM_KEYDOWN )
 898     {
 899         WORD vkey = msg->wParam;
 900         if ( (HIWORD(msg->lParam) & KF_ALTDOWN) == KF_ALTDOWN )
 901         {
 902             if ( vkey == VK_BACK )
 903                 return FALSE;
 904         }
 905         else // no Alt
 906         {
 907             if ( wxIsCtrlDown() )
 908             {
 909                 switch ( vkey )
 910                 {
 911                     case 'C':
 912                     case 'V':
 913                     case 'X':
 914                     case VK_INSERT:
 915                     case VK_DELETE:
 916                     case VK_HOME:
 917                     case VK_END:
 918                         return FALSE;
 919                 }
 920             }
 921             else if ( wxIsShiftDown() )
 922             {
 923                 if ( vkey == VK_INSERT || vkey == VK_DELETE )
 924                     return FALSE;
 925             }
 926         }
 927     }
 928
 929     return wxControl::MSWShouldPreProcessMessage(pMsg);
 930 }
 931
 932 void wxTextCtrl::OnChar(wxKeyEvent& event)
 933 {
 934     switch ( event.KeyCode() )
 935     {
 936         case WXK_RETURN:
 937             if ( !(m_windowStyle & wxTE_MULTILINE) )
 938             {
 939                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 940                 InitCommandEvent(event);
 941                 event.SetString(GetValue());
 942                 if ( GetEventHandler()->ProcessEvent(event) )
 943                     return;
 944             }
 945             //else: multiline controls need Enter for themselves
 946
 947             break;
 948
 949         case WXK_TAB:
 950             // always produce navigation event - even if we process TAB
 951             // ourselves the fact that we got here means that the user code
 952             // decided to skip processing of this TAB - probably to let it
 953             // do its default job.
 954             {
 955                 wxNavigationKeyEvent eventNav;
 956                 eventNav.SetDirection(!event.ShiftDown());
 957                 eventNav.SetWindowChange(event.ControlDown());
 958                 eventNav.SetEventObject(this);
 959
 960                 if ( GetParent()->GetEventHandler()->ProcessEvent(eventNav) )
 961                     return;
 962             }
 963             break;
 964     }
 965
 966     // no, we didn't process it
 967     event.Skip();
 968 }
 969
 970 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 971 {
 972     switch (param)
 973     {
 974         case EN_SETFOCUS:
 975         case EN_KILLFOCUS:
 976             {
 977                 wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
 978                                                          : wxEVT_SET_FOCUS,
 979                                    m_windowId);
 980                 event.SetEventObject( this );
 981                 GetEventHandler()->ProcessEvent(event);
 982             }
 983             break;
 984
 985         case EN_CHANGE:
 986             {
 987                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
 988                 InitCommandEvent(event);
 989                 event.SetString(GetValue());
 990                 ProcessCommand(event);
 991             }
 992             break;
 993
 994         case EN_MAXTEXT:
 995             // the text size limit has been hit - increase it
 996             if ( !AdjustSpaceLimit() )
 997             {
 998                 wxCommandEvent event(wxEVT_COMMAND_TEXT_MAXLEN, m_windowId);
 999                 InitCommandEvent(event);
1000                 event.SetString(GetValue());
1001                 ProcessCommand(event);
1002             }
1003             break;
1004
1005             // the other notification messages are not processed
1006         case EN_UPDATE:
1007         case EN_ERRSPACE:
1008         case EN_HSCROLL:
1009         case EN_VSCROLL:
1010             return FALSE;
1011         default:
1012             return FALSE;
1013     }
1014
1015     // processed
1016     return TRUE;
1017 }
1018
1019 WXHBRUSH wxTextCtrl::OnCtlColor(WXHDC pDC, WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
1020 #if wxUSE_CTL3D
1021                                WXUINT message,
1022                                WXWPARAM wParam,
1023                                WXLPARAM lParam
1024 #else
1025                                WXUINT WXUNUSED(message),
1026                                WXWPARAM WXUNUSED(wParam),
1027                                WXLPARAM WXUNUSED(lParam)
1028 #endif
1029     )
1030 {
1031 #if wxUSE_CTL3D
1032     if ( m_useCtl3D )
1033     {
1034         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
1035         return (WXHBRUSH) hbrush;
1036     }
1037 #endif // wxUSE_CTL3D
1038
1039     HDC hdc = (HDC)pDC;
1040     if (GetParent()->GetTransparentBackground())
1041         SetBkMode(hdc, TRANSPARENT);
1042     else
1043         SetBkMode(hdc, OPAQUE);
1044
1045     wxColour colBack = GetBackgroundColour();
1046
1047     if (!IsEnabled() && (GetWindowStyle() & wxTE_MULTILINE) == 0)
1048         colBack = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
1049
1050     ::SetBkColor(hdc, wxColourToRGB(colBack));
1051     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
1052
1053     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
1054
1055     return (WXHBRUSH)brush->GetResourceHandle();
1056 }
1057
1058 // In WIN16, need to override normal erasing because
1059 // Ctl3D doesn't use the wxWindows background colour.
1060 #ifdef __WIN16__
1061 void wxTextCtrl::OnEraseBackground(wxEraseEvent& event)
1062 {
1063     wxColour col(m_backgroundColour);
1064
1065 #if wxUSE_CTL3D
1066     if (m_useCtl3D)
1067         col = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW);
1068 #endif
1069
1070     RECT rect;
1071     ::GetClientRect(GetHwnd(), &rect);
1072
1073     COLORREF ref = PALETTERGB(col.Red(),
1074                               col.Green(),
1075                               col.Blue());
1076     HBRUSH hBrush = ::CreateSolidBrush(ref);
1077     if ( !hBrush )
1078         wxLogLastError(wxT("CreateSolidBrush"));
1079
1080     HDC hdc = (HDC)event.GetDC()->GetHDC();
1081
1082     int mode = ::SetMapMode(hdc, MM_TEXT);
1083
1084     ::FillRect(hdc, &rect, hBrush);
1085     ::DeleteObject(hBrush);
1086     ::SetMapMode(hdc, mode);
1087
1088 }
1089 #endif
1090
1091 bool wxTextCtrl::AdjustSpaceLimit()
1092 {
1093 #ifndef __WIN16__
1094     unsigned int limit = ::SendMessage(GetHwnd(), EM_GETLIMITTEXT, 0, 0);
1095
1096     // HACK: we try to automatically extend the limit for the amount of text
1097     //       to allow (interactively) entering more than 64Kb of text under
1098     //       Win9x but we shouldn't reset the text limit which was previously
1099     //       set explicitly with SetMaxLength()
1100     //
1101     //       we could solve this by storing the limit we set in wxTextCtrl but
1102     //       to save space we prefer to simply test here the actual limit
1103     //       value: we consider that SetMaxLength() can only be called for
1104     //       values < 32Kb
1105     if ( limit < 0x8000 )
1106     {
1107         // we've got more text than limit set by SetMaxLength()
1108         return FALSE;
1109     }
1110
1111     unsigned int len = ::GetWindowTextLength(GetHwnd());
1112     if ( len >= limit )
1113     {
1114         limit = len + 0x8000;    // 32Kb
1115
1116 #if wxUSE_RICHEDIT
1117         if ( m_isRich )
1118         {
1119             // as a nice side effect, this also allows passing limit > 64Kb
1120             ::SendMessage(GetHwnd(), EM_EXLIMITTEXT, 0, limit);
1121         }
1122         else
1123 #endif // wxUSE_RICHEDIT
1124         {
1125             if ( limit > 0xffff )
1126             {
1127                 // this will set it to a platform-dependent maximum (much more
1128                 // than 64Kb under NT)
1129                 limit = 0;
1130             }
1131
1132             ::SendMessage(GetHwnd(), EM_LIMITTEXT, limit, 0);
1133         }
1134     }
1135 #endif // !Win16
1136
1137     // we changed the limit
1138     return TRUE;
1139 }
1140
1141 bool wxTextCtrl::AcceptsFocus() const
1142 {
1143     // we don't want focus if we can't be edited
1144     return IsEditable() && wxControl::AcceptsFocus();
1145 }
1146
1147 wxSize wxTextCtrl::DoGetBestSize() const
1148 {
1149     int cx, cy;
1150     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
1151
1152     int wText = DEFAULT_ITEM_WIDTH;
1153
1154     int hText = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
1155     if ( m_windowStyle & wxTE_MULTILINE )
1156     {
1157         hText *= wxMax(GetNumberOfLines(), 5);
1158     }
1159     //else: for single line control everything is ok
1160
1161     return wxSize(wText, hText);
1162 }
1163
1164 // ----------------------------------------------------------------------------
1165 // standard handlers for standard edit menu events
1166 // ----------------------------------------------------------------------------
1167
1168 void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
1169 {
1170     Cut();
1171 }
1172
1173 void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
1174 {
1175     Copy();
1176 }
1177
1178 void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
1179 {
1180     Paste();
1181 }
1182
1183 void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
1184 {
1185     Undo();
1186 }
1187
1188 void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
1189 {
1190     Redo();
1191 }
1192
1193 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
1194 {
1195     event.Enable( CanCut() );
1196 }
1197
1198 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
1199 {
1200     event.Enable( CanCopy() );
1201 }
1202
1203 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
1204 {
1205     event.Enable( CanPaste() );
1206 }
1207
1208 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
1209 {
1210     event.Enable( CanUndo() );
1211 }
1212
1213 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
1214 {
1215     event.Enable( CanRedo() );
1216 }
1217
1218 // the rest of the file only deals with the rich edit controls
1219 #if wxUSE_RICHEDIT
1220
1221 // ----------------------------------------------------------------------------
1222 // EN_LINK processing
1223 // ----------------------------------------------------------------------------
1224
1225 bool wxTextCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
1226 {
1227     NMHDR *hdr = (NMHDR* )lParam;
1228     if ( hdr->code == EN_LINK )
1229     {
1230         ENLINK *enlink = (ENLINK *)hdr;
1231
1232         switch ( enlink->msg )
1233         {
1234             case WM_SETCURSOR:
1235                 // ok, so it is hardcoded - do we really nee to customize it?
1236                 ::SetCursor(GetHcursorOf(wxCursor(wxCURSOR_HAND)));
1237                 *result = TRUE;
1238                 break;
1239
1240             case WM_MOUSEMOVE:
1241             case WM_LBUTTONDOWN:
1242             case WM_LBUTTONUP:
1243             case WM_LBUTTONDBLCLK:
1244             case WM_RBUTTONDOWN:
1245             case WM_RBUTTONUP:
1246             case WM_RBUTTONDBLCLK:
1247                 // send a mouse event
1248                 {
1249                     static const wxEventType eventsMouse[] =
1250                     {
1251                         wxEVT_MOTION,
1252                         wxEVT_LEFT_DOWN,
1253                         wxEVT_LEFT_UP,
1254                         wxEVT_LEFT_DCLICK,
1255                         wxEVT_RIGHT_DOWN,
1256                         wxEVT_RIGHT_UP,
1257                         wxEVT_RIGHT_DCLICK,
1258                     };
1259
1260                     // the event ids are consecutive
1261                     wxMouseEvent
1262                         evtMouse(eventsMouse[enlink->msg - WM_MOUSEMOVE]);
1263
1264                     InitMouseEvent(evtMouse,
1265                                    GET_X_LPARAM(enlink->lParam),
1266                                    GET_Y_LPARAM(enlink->lParam),
1267                                    enlink->wParam);
1268
1269                     wxTextUrlEvent event(m_windowId, evtMouse,
1270                                          enlink->chrg.cpMin,
1271                                          enlink->chrg.cpMax);
1272
1273                     InitCommandEvent(event);
1274
1275                     *result = ProcessCommand(event);
1276                 }
1277                 break;
1278         }
1279
1280         return TRUE;
1281     }
1282
1283     // not processed
1284     return FALSE;
1285 }
1286
1287 // ----------------------------------------------------------------------------
1288 // colour setting for the rich edit controls
1289 // ----------------------------------------------------------------------------
1290
1291 // Watcom C++ doesn't define this
1292 #ifndef SCF_ALL
1293 #define SCF_ALL 0x0004
1294 #endif
1295
1296 bool wxTextCtrl::SetBackgroundColour(const wxColour& colour)
1297 {
1298     if ( !wxTextCtrlBase::SetBackgroundColour(colour) )
1299     {
1300         // colour didn't really change
1301         return FALSE;
1302     }
1303
1304     if ( IsRich() )
1305     {
1306         // rich edit doesn't use WM_CTLCOLOR, hence we need to send
1307         // EM_SETBKGNDCOLOR additionally
1308         ::SendMessage(GetHwnd(), EM_SETBKGNDCOLOR, 0, wxColourToRGB(colour));
1309     }
1310
1311     return TRUE;
1312 }
1313
1314 bool wxTextCtrl::SetForegroundColour(const wxColour& colour)
1315 {
1316     if ( !wxTextCtrlBase::SetForegroundColour(colour) )
1317     {
1318         // colour didn't really change
1319         return FALSE;
1320     }
1321
1322     if ( IsRich() )
1323     {
1324         // change the colour of everything
1325         CHARFORMAT cf;
1326         wxZeroMemory(cf);
1327         cf.cbSize = sizeof(cf);
1328         cf.dwMask = CFM_COLOR;
1329         cf.crTextColor = wxColourToRGB(colour);
1330         ::SendMessage(GetHwnd(), EM_SETCHARFORMAT, SCF_ALL, (LPARAM)&cf);
1331     }
1332
1333     return TRUE;
1334 }
1335
1336 // ----------------------------------------------------------------------------
1337 // styling support for rich edit controls
1338 // ----------------------------------------------------------------------------
1339
1340 bool wxTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
1341 {
1342     if ( !IsRich() )
1343     {
1344         // can't do it with normal text control
1345         return FALSE;
1346     }
1347
1348     // the rich text control doesn't handle setting background colour, so don't
1349     // even try if it's the only thing we want to change
1350     if ( wxRichEditModule::GetLoadedVersion() < 2 &&
1351          !style.HasFont() && !style.HasTextColour() )
1352     {
1353         // nothing to do: return TRUE if there was really nothing to do and
1354         // FALSE if we failed to set bg colour
1355         return !style.HasBackgroundColour();
1356     }
1357
1358     // order the range if needed
1359     if ( start > end )
1360     {
1361         long tmp = start;
1362         start = end;
1363         end = tmp;
1364     }
1365
1366     // we can only change the format of the selection, so select the range we
1367     // want and restore the old selection later
1368     long startOld, endOld;
1369     GetSelection(&startOld, &endOld);
1370
1371     // but do we really have to change the selection?
1372     bool changeSel = start != startOld || end != endOld;
1373
1374     if ( changeSel )
1375         SendMessage(GetHwnd(), EM_SETSEL, (WPARAM) start, (LPARAM) end);
1376
1377     // initialize CHARFORMAT struct
1378 #if wxUSE_RICHEDIT2
1379     CHARFORMAT2 cf;
1380 #else
1381     CHARFORMAT cf;
1382 #endif
1383     wxZeroMemory(cf);
1384     cf.cbSize = sizeof(cf);
1385
1386     if ( style.HasFont() )
1387     {
1388         cf.dwMask |= CFM_FACE | CFM_SIZE | CFM_CHARSET |
1389                      CFM_ITALIC | CFM_BOLD | CFM_UNDERLINE;
1390
1391         // fill in data from LOGFONT but recalculate lfHeight because we need
1392         // the real height in twips and not the negative number which
1393         // wxFillLogFont() returns (this is correct in general and works with
1394         // the Windows font mapper, but not here)
1395         LOGFONT lf;
1396         wxFillLogFont(&lf, &style.GetFont());
1397         cf.yHeight = 20*style.GetFont().GetPointSize(); // 1 pt = 20 twips
1398         cf.bCharSet = lf.lfCharSet;
1399         cf.bPitchAndFamily = lf.lfPitchAndFamily;
1400         wxStrncpy( cf.szFaceName, lf.lfFaceName, WXSIZEOF(cf.szFaceName) );
1401
1402         // also deal with underline/italic/bold attributes: note that we must
1403         // always set CFM_ITALIC &c bits in dwMask, even if we don't set the
1404         // style to allow clearing it
1405         if ( lf.lfItalic )
1406         {
1407             cf.dwEffects |= CFE_ITALIC;
1408         }
1409
1410         if ( lf.lfWeight == FW_BOLD )
1411         {
1412             cf.dwEffects |= CFE_BOLD;
1413         }
1414
1415         if ( lf.lfUnderline )
1416         {
1417             cf.dwEffects |= CFE_UNDERLINE;
1418         }
1419
1420         // strikeout fonts are not supported by wxWindows
1421     }
1422
1423     if ( style.HasTextColour() )
1424     {
1425         cf.dwMask |= CFM_COLOR;
1426         cf.crTextColor = wxColourToRGB(style.GetTextColour());
1427     }
1428
1429 #if wxUSE_RICHEDIT2
1430     if ( wxRichEditModule::GetLoadedVersion() > 1 && style.HasBackgroundColour() )
1431     {
1432         cf.dwMask |= CFM_BACKCOLOR;
1433         cf.crBackColor = wxColourToRGB(style.GetBackgroundColour());
1434     }
1435 #endif // wxUSE_RICHEDIT2
1436
1437     // do format the selection
1438     bool ok = ::SendMessage(GetHwnd(), EM_SETCHARFORMAT,
1439                             SCF_SELECTION, (LPARAM)&cf) != 0;
1440     if ( !ok )
1441     {
1442         wxLogDebug(_T("SendMessage(EM_SETCHARFORMAT, SCF_SELECTION) failed"));
1443     }
1444
1445     if ( changeSel )
1446     {
1447         // restore the original selection
1448         SendMessage(GetHwnd(), EM_SETSEL, (WPARAM)startOld, (LPARAM)endOld);
1449     }
1450
1451     return ok;
1452 }
1453
1454 // ----------------------------------------------------------------------------
1455 // wxRichEditModule
1456 // ----------------------------------------------------------------------------
1457
1458 bool wxRichEditModule::OnInit()
1459 {
1460     // don't do anything - we will load it when needed
1461     return TRUE;
1462 }
1463
1464 void wxRichEditModule::OnExit()
1465 {
1466     if ( ms_hRichEdit )
1467     {
1468         FreeLibrary(ms_hRichEdit);
1469     }
1470 }
1471
1472 /* static */
1473 bool wxRichEditModule::Load(int version)
1474 {
1475     wxCHECK_MSG( version >= 1 && version <= 3, FALSE,
1476                  _T("incorrect richedit control version requested") );
1477
1478     if ( version <= ms_verRichEdit )
1479     {
1480         // we've already got this or better
1481         return TRUE;
1482     }
1483
1484     if ( ms_hRichEdit )
1485     {
1486         ::FreeLibrary(ms_hRichEdit);
1487     }
1488
1489     // always try load riched20.dll first - like this we won't have to reload
1490     // it later if we're first asked for RE 1 and then for RE 2 or 3
1491     wxString dllname = _T("riched20.dll");
1492     ms_hRichEdit = ::LoadLibrary(dllname);
1493     ms_verRichEdit = 2; // no way to tell if it's 2 or 3, assume 2
1494
1495     if ( !ms_hRichEdit && (version == 1) )
1496     {
1497         // fall back to RE 1
1498         dllname = _T("riched32.dll");
1499         ms_hRichEdit = ::LoadLibrary(dllname);
1500         ms_verRichEdit = 1;
1501     }
1502
1503     if ( !ms_hRichEdit )
1504     {
1505         wxLogSysError(_("Could not load Rich Edit DLL '%s'"), dllname.c_str());
1506
1507         ms_verRichEdit = -1;
1508
1509         return FALSE;
1510     }
1511
1512     return TRUE;
1513 }
1514
1515 #endif // wxUSE_RICHEDIT
1516
1517 #endif // wxUSE_TEXTCTRL