src/msw/textctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/textctrl.cpp
   3 // Purpose:     wxTextCtrl
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 #ifdef __GNUG__
  17     #pragma implementation "textctrl.h"
  18 #endif
  19
  20 // ----------------------------------------------------------------------------
  21 // headers
  22 // ----------------------------------------------------------------------------
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/textctrl.h"
  33     #include "wx/settings.h"
  34     #include "wx/brush.h"
  35     #include "wx/utils.h"
  36     #include "wx/intl.h"
  37     #include "wx/log.h"
  38     #include "wx/app.h"
  39 #endif
  40
  41 #include "wx/module.h"
  42
  43 #if wxUSE_CLIPBOARD
  44     #include "wx/clipbrd.h"
  45 #endif
  46
  47 #include "wx/textfile.h"
  48
  49 #include <windowsx.h>
  50
  51 #include "wx/msw/private.h"
  52
  53 #include <string.h>
  54 #include <stdlib.h>
  55 #include <sys/types.h>
  56
  57 #if wxUSE_IOSTREAMH
  58 #   include <fstream.h>
  59 #else
  60 #   include <fstream>
  61 #endif
  62
  63 #if wxUSE_RICHEDIT && !defined(__GNUWIN32_OLD__)
  64     #include <richedit.h>
  65 #endif
  66
  67 // ----------------------------------------------------------------------------
  68 // private classes
  69 // ----------------------------------------------------------------------------
  70
  71 #if wxUSE_RICHEDIT
  72
  73 // this module initializes RichEdit DLL if needed
  74 class wxRichEditModule : public wxModule
  75 {
  76 public:
  77     virtual bool OnInit();
  78     virtual void OnExit();
  79
  80     // get the version currently loaded, -1 if none
  81     static int GetLoadedVersion() { return ms_verRichEdit; }
  82
  83     // load the richedit DLL of at least of required version
  84     static bool Load(int version = 1);
  85
  86 private:
  87     // the handle to richedit DLL and the version of the DLL loaded
  88     static HINSTANCE ms_hRichEdit;
  89
  90     // the DLL version loaded or -1 if none
  91     static int ms_verRichEdit;
  92
  93     DECLARE_DYNAMIC_CLASS(wxRichEditModule)
  94 };
  95
  96 HINSTANCE wxRichEditModule::ms_hRichEdit = (HINSTANCE)NULL;
  97 int       wxRichEditModule::ms_verRichEdit = -1;
  98
  99 IMPLEMENT_DYNAMIC_CLASS(wxRichEditModule, wxModule)
 100
 101 #endif // wxUSE_RICHEDIT
 102
 103 // ----------------------------------------------------------------------------
 104 // event tables and other macros
 105 // ----------------------------------------------------------------------------
 106
 107 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
 108
 109 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
 110     EVT_CHAR(wxTextCtrl::OnChar)
 111     EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
 112
 113     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
 114     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
 115     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
 116     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
 117     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
 118
 119     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
 120     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
 121     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
 122     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
 123     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
 124 #ifdef __WIN16__
 125     EVT_ERASE_BACKGROUND(wxTextCtrl::OnEraseBackground)
 126 #endif
 127 END_EVENT_TABLE()
 128
 129
 130 // ============================================================================
 131 // implementation
 132 // ============================================================================
 133
 134 // ----------------------------------------------------------------------------
 135 // creation
 136 // ----------------------------------------------------------------------------
 137
 138 wxTextCtrl::wxTextCtrl()
 139 {
 140 #if wxUSE_RICHEDIT
 141     m_isRich = FALSE;
 142 #endif
 143 }
 144
 145 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
 146                         const wxString& value,
 147                         const wxPoint& pos,
 148                         const wxSize& size,
 149                         long style,
 150                         const wxValidator& validator,
 151                         const wxString& name)
 152 {
 153     // base initialization
 154     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
 155         return FALSE;
 156
 157     if ( parent )
 158         parent->AddChild(this);
 159
 160     // translate wxWin style flags to MSW ones, checking for consistency while
 161     // doing it
 162     long msStyle = ES_LEFT | WS_VISIBLE | WS_CHILD | WS_TABSTOP /* | WS_CLIPSIBLINGS */ ;
 163     if ( m_windowStyle & wxTE_MULTILINE )
 164     {
 165         wxASSERT_MSG( !(m_windowStyle & wxTE_PROCESS_ENTER),
 166                       wxT("wxTE_PROCESS_ENTER style is ignored for multiline text controls (they always process it)") );
 167
 168         msStyle |= ES_MULTILINE | ES_WANTRETURN;
 169         if ((m_windowStyle & wxTE_NO_VSCROLL) == 0)
 170             msStyle |= WS_VSCROLL;
 171         m_windowStyle |= wxTE_PROCESS_ENTER;
 172     }
 173     else
 174         msStyle |= ES_AUTOHSCROLL;
 175
 176     if (m_windowStyle & wxHSCROLL)
 177         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 178
 179     if (m_windowStyle & wxTE_READONLY)
 180         msStyle |= ES_READONLY;
 181
 182     if (m_windowStyle & wxTE_PASSWORD) // hidden input
 183         msStyle |= ES_PASSWORD;
 184
 185    if (m_windowStyle & wxTE_AUTO_SCROLL)
 186         msStyle |=  ES_AUTOHSCROLL;
 187
 188
 189     // we always want the characters and the arrows
 190     m_lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;
 191
 192     // we may have several different cases:
 193     // 1. normal case: both TAB and ENTER are used for dialog navigation
 194     // 2. ctrl which wants TAB for itself: ENTER is used to pass to the next
 195     //    control in the dialog
 196     // 3. ctrl which wants ENTER for itself: TAB is used for dialog navigation
 197     // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to pass to
 198     //    the next control
 199     if ( m_windowStyle & wxTE_PROCESS_ENTER )
 200         m_lDlgCode |= DLGC_WANTMESSAGE;
 201     if ( m_windowStyle & wxTE_PROCESS_TAB )
 202         m_lDlgCode |= DLGC_WANTTAB;
 203
 204     // do create the control - either an EDIT or RICHEDIT
 205     wxString windowClass = wxT("EDIT");
 206
 207 #if wxUSE_RICHEDIT
 208     if ( m_windowStyle & wxTE_RICH )
 209     {
 210         static bool s_errorGiven = FALSE;   // MT-FIXME
 211
 212         // only give the error msg once if the DLL can't be loaded
 213         if ( !s_errorGiven )
 214         {
 215             // first try to load the RichEdit DLL (will do nothing if already
 216             // done)
 217             if ( !wxRichEditModule::Load() )
 218             {
 219                 wxLogError(_("Impossible to create a rich edit control, using simple text control instead. Please reinstall riched32.dll"));
 220
 221                 s_errorGiven = TRUE;
 222             }
 223         }
 224
 225         if ( s_errorGiven )
 226         {
 227             m_isRich = FALSE;
 228         }
 229         else
 230         {
 231             msStyle |= ES_AUTOVSCROLL;
 232             m_isRich = TRUE;
 233
 234             int ver = wxRichEditModule::GetLoadedVersion();
 235             if ( ver == 1 )
 236             {
 237                 windowClass = wxT("RICHEDIT");
 238             }
 239             else
 240             {
 241 #ifndef RICHEDIT_CLASS
 242                 wxString RICHEDIT_CLASS;
 243                 RICHEDIT_CLASS.Printf(_T("RichEdit%d0"), ver);
 244 #if wxUSE_UNICODE
 245                 RICHEDIT_CLASS += _T('W');
 246 #else // ANSI
 247                 RICHEDIT_CLASS += _T('A');
 248 #endif // Unicode/ANSI
 249 #endif // !RICHEDIT_CLASS
 250
 251                 windowClass = RICHEDIT_CLASS;
 252             }
 253         }
 254     }
 255     else
 256         m_isRich = FALSE;
 257 #endif // wxUSE_RICHEDIT
 258
 259     bool want3D;
 260     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 261
 262     // Even with extended styles, need to combine with WS_BORDER for them to
 263     // look right.
 264     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 265         msStyle |= WS_BORDER;
 266
 267     // NB: don't use pos and size as CreateWindowEx arguments because they
 268     //     might be -1 in which case we should use the default values (and
 269     //     SetSize called below takes care of it)
 270     m_hWnd = (WXHWND)::CreateWindowEx(exStyle,
 271                                       windowClass.c_str(),
 272                                       NULL,
 273                                       msStyle,
 274                                       0, 0, 0, 0,
 275                                       GetHwndOf(parent),
 276                                       (HMENU)m_windowId,
 277                                       wxGetInstance(),
 278                                       NULL);
 279
 280     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create text ctrl") );
 281
 282 #if wxUSE_CTL3D
 283     if ( want3D )
 284     {
 285         Ctl3dSubclassCtl(GetHwnd());
 286         m_useCtl3D = TRUE;
 287     }
 288 #endif
 289
 290 #if wxUSE_RICHEDIT
 291     if (m_isRich)
 292     {
 293         // Have to enable events
 294         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0,
 295                       ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 296     }
 297 #endif
 298
 299     SubclassWin(GetHWND());
 300
 301     // set font, position, size and initial value
 302     wxFont& fontParent = parent->GetFont();
 303     if ( fontParent.Ok() )
 304     {
 305         SetFont(fontParent);
 306     }
 307     else
 308     {
 309         SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 310     }
 311
 312     // Causes a crash for Symantec C++ and WIN32 for some reason
 313 #if !(defined(__SC__) && defined(__WIN32__))
 314     if ( !value.IsEmpty() )
 315     {
 316         SetValue(value);
 317     }
 318 #endif
 319
 320     // set colours
 321     SetupColours();
 322
 323     SetSize(pos.x, pos.y, size.x, size.y);
 324
 325     return TRUE;
 326 }
 327
 328 // Make sure the window style (etc.) reflects the HWND style (roughly)
 329 void wxTextCtrl::AdoptAttributesFromHWND()
 330 {
 331   wxWindow::AdoptAttributesFromHWND();
 332
 333   HWND hWnd = GetHwnd();
 334   long style = GetWindowLong(hWnd, GWL_STYLE);
 335
 336   // retrieve the style to see whether this is an edit or richedit ctrl
 337 #if wxUSE_RICHEDIT
 338   wxChar buf[256];
 339
 340   GetClassName(hWnd, buf, WXSIZEOF(buf));
 341
 342   if ( wxStricmp(buf, wxT("EDIT")) == 0 )
 343     m_isRich = FALSE;
 344   else
 345     m_isRich = TRUE;
 346 #endif // wxUSE_RICHEDIT
 347
 348   if (style & ES_MULTILINE)
 349     m_windowStyle |= wxTE_MULTILINE;
 350   if (style & ES_PASSWORD)
 351     m_windowStyle |= wxTE_PASSWORD;
 352   if (style & ES_READONLY)
 353     m_windowStyle |= wxTE_READONLY;
 354   if (style & ES_WANTRETURN)
 355     m_windowStyle |= wxTE_PROCESS_ENTER;
 356 }
 357
 358 void wxTextCtrl::SetupColours()
 359 {
 360     wxColour bkgndColour;
 361 //    if (IsEditable() || (m_windowStyle & wxTE_MULTILINE))
 362         bkgndColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW);
 363 //    else
 364 //        bkgndColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
 365
 366     SetBackgroundColour(bkgndColour);
 367     SetForegroundColour(GetParent()->GetForegroundColour());
 368 }
 369
 370 // ----------------------------------------------------------------------------
 371 // set/get the controls text
 372 // ----------------------------------------------------------------------------
 373
 374 wxString wxTextCtrl::GetValue() const
 375 {
 376     // we can't use wxGetWindowText() (i.e. WM_GETTEXT internally) for
 377     // retrieving more than 64Kb under Win9x
 378 #if wxUSE_RICHEDIT
 379     if ( m_isRich )
 380     {
 381         wxString str;
 382
 383         int len = GetWindowTextLength(GetHwnd());
 384         if ( len )
 385         {
 386             // alloc one extra WORD as needed by the control
 387             wxChar *p = str.GetWriteBuf(++len);
 388
 389             TEXTRANGE textRange;
 390             textRange.chrg.cpMin = 0;
 391             textRange.chrg.cpMax = -1;
 392             textRange.lpstrText = p;
 393
 394             (void)SendMessage(GetHwnd(), EM_GETTEXTRANGE, 0, (LPARAM)&textRange);
 395
 396             // believe it or not, but EM_GETTEXTRANGE uses just CR ('\r') for
 397             // the newlines which is neither Unix nor Windows style (Win95 with
 398             // riched20.dll shows this behaviour) - convert it to something
 399             // reasonable
 400             for ( ; *p; p++ )
 401             {
 402                 if ( *p == _T('\r') )
 403                     *p = _T('\n');
 404             }
 405
 406             str.UngetWriteBuf();
 407         }
 408         //else: no text at all, leave the string empty
 409
 410         return str;
 411     }
 412 #endif // wxUSE_RICHEDIT
 413
 414     // WM_GETTEXT uses standard DOS CR+LF (\r\n) convention - convert to the
 415     // same one as above for consitency
 416     wxString str = wxGetWindowText(GetHWND());
 417
 418     return wxTextFile::Translate(str, wxTextFileType_Unix);
 419 }
 420
 421 void wxTextCtrl::SetValue(const wxString& value)
 422 {
 423     // if the text is long enough, it's faster to just set it instead of first
 424     // comparing it with the old one (chances are that it will be different
 425     // anyhow, this comparison is there to avoid flicker for small single-line
 426     // edit controls mostly)
 427     if ( (value.length() > 0x400) || (value != GetValue()) )
 428     {
 429         wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 430
 431         SetWindowText(GetHwnd(), valueDos.c_str());
 432
 433         // for compatibility with the GTK and because it is more logical, we
 434         // move the cursor to the end of the text after SetValue()
 435
 436         // GRG, Jun/2000: Changed this back after a lot of discussion
 437         //   in the lists. wxWindows 2.2 will have a set of flags to
 438         //   customize this behaviour.
 439         //SetInsertionPointEnd();
 440
 441         AdjustSpaceLimit();
 442     }
 443 }
 444
 445 void wxTextCtrl::WriteText(const wxString& value)
 446 {
 447     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 448
 449     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 450
 451     AdjustSpaceLimit();
 452 }
 453
 454 void wxTextCtrl::AppendText(const wxString& text)
 455 {
 456     SetInsertionPointEnd();
 457     WriteText(text);
 458 }
 459
 460 void wxTextCtrl::Clear()
 461 {
 462     SetWindowText(GetHwnd(), wxT(""));
 463 }
 464
 465 // ----------------------------------------------------------------------------
 466 // Clipboard operations
 467 // ----------------------------------------------------------------------------
 468
 469 void wxTextCtrl::Copy()
 470 {
 471     if (CanCopy())
 472     {
 473         HWND hWnd = GetHwnd();
 474         SendMessage(hWnd, WM_COPY, 0, 0L);
 475     }
 476 }
 477
 478 void wxTextCtrl::Cut()
 479 {
 480     if (CanCut())
 481     {
 482         HWND hWnd = GetHwnd();
 483         SendMessage(hWnd, WM_CUT, 0, 0L);
 484     }
 485 }
 486
 487 void wxTextCtrl::Paste()
 488 {
 489     if (CanPaste())
 490     {
 491         HWND hWnd = GetHwnd();
 492         SendMessage(hWnd, WM_PASTE, 0, 0L);
 493     }
 494 }
 495
 496 bool wxTextCtrl::CanCopy() const
 497 {
 498     // Can copy if there's a selection
 499     long from, to;
 500     GetSelection(& from, & to);
 501     return (from != to) ;
 502 }
 503
 504 bool wxTextCtrl::CanCut() const
 505 {
 506     // Can cut if there's a selection
 507     long from, to;
 508     GetSelection(& from, & to);
 509     return (from != to) && (IsEditable());
 510 }
 511
 512 bool wxTextCtrl::CanPaste() const
 513 {
 514 #if wxUSE_RICHEDIT
 515     if (m_isRich)
 516     {
 517         int dataFormat = 0; // 0 == any format
 518         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 519     }
 520 #endif
 521     if (!IsEditable())
 522         return FALSE;
 523
 524     // Standard edit control: check for straight text on clipboard
 525     bool isTextAvailable = FALSE;
 526     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 527     {
 528         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 529         ::CloseClipboard();
 530     }
 531
 532     return isTextAvailable;
 533 }
 534
 535 // ----------------------------------------------------------------------------
 536 // Accessors
 537 // ----------------------------------------------------------------------------
 538
 539 void wxTextCtrl::SetEditable(bool editable)
 540 {
 541     HWND hWnd = GetHwnd();
 542     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 543 }
 544
 545 void wxTextCtrl::SetInsertionPoint(long pos)
 546 {
 547     HWND hWnd = GetHwnd();
 548 #ifdef __WIN32__
 549 #if wxUSE_RICHEDIT
 550     if ( m_isRich)
 551     {
 552         CHARRANGE range;
 553         range.cpMin = pos;
 554         range.cpMax = pos;
 555         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 556         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 557     }
 558     else
 559 #endif // wxUSE_RICHEDIT
 560     {
 561         SendMessage(hWnd, EM_SETSEL, pos, pos);
 562         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 563     }
 564 #else // Win16
 565     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 566 #endif // Win32/16
 567
 568     static const wxChar *nothing = _T("");
 569     SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 570 }
 571
 572 void wxTextCtrl::SetInsertionPointEnd()
 573 {
 574     long pos = GetLastPosition();
 575     SetInsertionPoint(pos);
 576 }
 577
 578 long wxTextCtrl::GetInsertionPoint() const
 579 {
 580 #if wxUSE_RICHEDIT
 581     if (m_isRich)
 582     {
 583         CHARRANGE range;
 584         range.cpMin = 0;
 585         range.cpMax = 0;
 586         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 587         return range.cpMin;
 588     }
 589 #endif
 590
 591     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 592     return Pos & 0xFFFF;
 593 }
 594
 595 long wxTextCtrl::GetLastPosition() const
 596 {
 597     HWND hWnd = GetHwnd();
 598
 599     // Will always return a number > 0 (according to docs)
 600     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 601
 602     // This gets the char index for the _beginning_ of the last line
 603     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 604
 605     // Get number of characters in the last line. We'll add this to the character
 606     // index for the last line, 1st position.
 607     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 608
 609     return (long)(charIndex + lineLength);
 610 }
 611
 612 // If the return values from and to are the same, there is no
 613 // selection.
 614 void wxTextCtrl::GetSelection(long* from, long* to) const
 615 {
 616 #if wxUSE_RICHEDIT
 617     if (m_isRich)
 618     {
 619         CHARRANGE charRange;
 620         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 621
 622         *from = charRange.cpMin;
 623         *to = charRange.cpMax;
 624
 625         return;
 626     }
 627 #endif
 628     DWORD dwStart, dwEnd;
 629     WPARAM wParam = (WPARAM) (DWORD*) & dwStart; // receives starting position
 630     LPARAM lParam = (LPARAM) (DWORD*) & dwEnd;   // receives ending position
 631
 632     ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 633
 634     *from = dwStart;
 635     *to = dwEnd;
 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 #if wxUSE_CLIPBOARD
 652     HWND hWnd = GetHwnd();
 653     long fromChar = from;
 654     long toChar = to;
 655
 656     // Set selection and remove it
 657 #ifdef __WIN32__
 658     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 659 #else
 660     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 661 #endif
 662     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 663
 664     // Now replace with 'value', by pasting.
 665     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const wxChar *)value, 0, 0);
 666
 667     // Paste into edit control
 668     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 669 #else
 670     wxFAIL_MSG("wxTextCtrl::Replace not implemented if wxUSE_CLIPBOARD is 0.");
 671 #endif
 672 }
 673
 674 void wxTextCtrl::Remove(long from, long to)
 675 {
 676     HWND hWnd = GetHwnd();
 677     long fromChar = from;
 678     long toChar = to;
 679
 680     // Cut all selected text
 681 #ifdef __WIN32__
 682     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 683 #else
 684     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 685 #endif
 686     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 687 }
 688
 689 void wxTextCtrl::SetSelection(long from, long to)
 690 {
 691     HWND hWnd = GetHwnd();
 692     long fromChar = from;
 693     long toChar = to;
 694
 695     // if from and to are both -1, it means (in wxWindows) that all text should
 696     // be selected. Translate into Windows convention
 697     if ((from == -1) && (to == -1))
 698     {
 699       fromChar = 0;
 700       toChar = -1;
 701     }
 702
 703 #ifdef __WIN32__
 704     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 705     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 706 #else
 707     // WPARAM is 0: selection is scrolled into view
 708     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 709 #endif
 710 }
 711
 712 bool wxTextCtrl::LoadFile(const wxString& file)
 713 {
 714     if ( wxTextCtrlBase::LoadFile(file) )
 715     {
 716         // update the size limit if needed
 717         AdjustSpaceLimit();
 718
 719         return TRUE;
 720     }
 721
 722     return FALSE;
 723 }
 724
 725 bool wxTextCtrl::IsModified() const
 726 {
 727     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 728 }
 729
 730 // Makes 'unmodified'
 731 void wxTextCtrl::DiscardEdits()
 732 {
 733     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 734 }
 735
 736 int wxTextCtrl::GetNumberOfLines() const
 737 {
 738     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 739 }
 740
 741 long wxTextCtrl::XYToPosition(long x, long y) const
 742 {
 743     HWND hWnd = GetHwnd();
 744
 745     // This gets the char index for the _beginning_ of this line
 746     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 747     return (long)(x + charIndex);
 748 }
 749
 750 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 751 {
 752     HWND hWnd = GetHwnd();
 753
 754     // This gets the line number containing the character
 755     int lineNo;
 756 #if wxUSE_RICHEDIT
 757     if ( m_isRich )
 758     {
 759         lineNo = (int)SendMessage(hWnd, EM_EXLINEFROMCHAR, 0, (LPARAM)pos);
 760     }
 761     else
 762 #endif // wxUSE_RICHEDIT
 763         lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, 0);
 764
 765     if ( lineNo == -1 )
 766     {
 767         // no such line
 768         return FALSE;
 769     }
 770
 771     // This gets the char index for the _beginning_ of this line
 772     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 773     if ( charIndex == -1 )
 774     {
 775         return FALSE;
 776     }
 777
 778     // The X position must therefore be the different between pos and charIndex
 779     if ( x )
 780         *x = (long)(pos - charIndex);
 781     if ( y )
 782         *y = (long)lineNo;
 783
 784     return TRUE;
 785 }
 786
 787 void wxTextCtrl::ShowPosition(long pos)
 788 {
 789     HWND hWnd = GetHwnd();
 790
 791     // To scroll to a position, we pass the number of lines and characters
 792     // to scroll *by*. This means that we need to:
 793     // (1) Find the line position of the current line.
 794     // (2) Find the line position of pos.
 795     // (3) Scroll by (pos - current).
 796     // For now, ignore the horizontal scrolling.
 797
 798     // Is this where scrolling is relative to - the line containing the caret?
 799     // Or is the first visible line??? Try first visible line.
 800 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 801
 802     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 803
 804     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 805
 806     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 807
 808     if (linesToScroll != 0)
 809       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 810 }
 811
 812 int wxTextCtrl::GetLineLength(long lineNo) const
 813 {
 814     long charIndex = XYToPosition(0, lineNo);
 815     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 816     return len;
 817 }
 818
 819 wxString wxTextCtrl::GetLineText(long lineNo) const
 820 {
 821     size_t len = (size_t)GetLineLength(lineNo) + 1;
 822
 823     // there must be at least enough place for the length WORD in the
 824     // buffer
 825     len += sizeof(WORD);
 826
 827     wxString str;
 828     wxChar *buf = str.GetWriteBuf(len);
 829
 830     *(WORD *)buf = len;
 831     len = (size_t)::SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 832     buf[len] = 0;
 833
 834     str.UngetWriteBuf(len);
 835
 836     return str;
 837 }
 838
 839 // ----------------------------------------------------------------------------
 840 // Undo/redo
 841 // ----------------------------------------------------------------------------
 842
 843 void wxTextCtrl::Undo()
 844 {
 845     if (CanUndo())
 846     {
 847         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 848     }
 849 }
 850
 851 void wxTextCtrl::Redo()
 852 {
 853     if (CanRedo())
 854     {
 855         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 856         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 857     }
 858 }
 859
 860 bool wxTextCtrl::CanUndo() const
 861 {
 862     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 863 }
 864
 865 bool wxTextCtrl::CanRedo() const
 866 {
 867     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 868 }
 869
 870 // ----------------------------------------------------------------------------
 871 // implemenation details
 872 // ----------------------------------------------------------------------------
 873
 874 void wxTextCtrl::Command(wxCommandEvent & event)
 875 {
 876     SetValue(event.GetString());
 877     ProcessCommand (event);
 878 }
 879
 880 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 881 {
 882     // By default, load the first file into the text window.
 883     if (event.GetNumberOfFiles() > 0)
 884     {
 885         LoadFile(event.GetFiles()[0]);
 886     }
 887 }
 888
 889 void wxTextCtrl::OnChar(wxKeyEvent& event)
 890 {
 891     switch ( event.KeyCode() )
 892     {
 893         case WXK_RETURN:
 894             if ( !(m_windowStyle & wxTE_MULTILINE) )
 895             {
 896                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 897                 InitCommandEvent(event);
 898                 event.SetString(GetValue());
 899                 if ( GetEventHandler()->ProcessEvent(event) )
 900                     return;
 901             }
 902             //else: multiline controls need Enter for themselves
 903
 904             break;
 905
 906         case WXK_TAB:
 907             // always produce navigation event - even if we process TAB
 908             // ourselves the fact that we got here means that the user code
 909             // decided to skip processing of this TAB - probably to let it
 910             // do its default job.
 911             {
 912                 wxNavigationKeyEvent eventNav;
 913                 eventNav.SetDirection(!event.ShiftDown());
 914                 eventNav.SetWindowChange(event.ControlDown());
 915                 eventNav.SetEventObject(this);
 916
 917                 if ( GetParent()->GetEventHandler()->ProcessEvent(eventNav) )
 918                     return;
 919             }
 920             break;
 921     }
 922
 923     // no, we didn't process it
 924     event.Skip();
 925 }
 926
 927 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 928 {
 929     switch (param)
 930     {
 931         case EN_SETFOCUS:
 932         case EN_KILLFOCUS:
 933             {
 934                 wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
 935                         : wxEVT_SET_FOCUS,
 936                         m_windowId);
 937                 event.SetEventObject( this );
 938                 GetEventHandler()->ProcessEvent(event);
 939             }
 940             break;
 941
 942         case EN_CHANGE:
 943             {
 944                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
 945                 InitCommandEvent(event);
 946                 event.SetString(GetValue());
 947                 ProcessCommand(event);
 948             }
 949             break;
 950
 951         case EN_MAXTEXT:
 952             // the text size limit has been hit - increase it
 953             AdjustSpaceLimit();
 954             break;
 955
 956             // the other notification messages are not processed
 957         case EN_UPDATE:
 958         case EN_ERRSPACE:
 959         case EN_HSCROLL:
 960         case EN_VSCROLL:
 961             return FALSE;
 962         default:
 963             return FALSE;
 964     }
 965
 966     // processed
 967     return TRUE;
 968 }
 969
 970 WXHBRUSH wxTextCtrl::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 971                                WXUINT message,
 972                                WXWPARAM wParam,
 973                                WXLPARAM lParam)
 974 {
 975 #if wxUSE_CTL3D
 976     if ( m_useCtl3D )
 977     {
 978         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 979         return (WXHBRUSH) hbrush;
 980     }
 981 #endif // wxUSE_CTL3D
 982
 983     HDC hdc = (HDC)pDC;
 984     if (GetParent()->GetTransparentBackground())
 985         SetBkMode(hdc, TRANSPARENT);
 986     else
 987         SetBkMode(hdc, OPAQUE);
 988
 989     wxColour colBack = GetBackgroundColour();
 990
 991     if (!IsEnabled() && (GetWindowStyle() & wxTE_MULTILINE) == 0)
 992         colBack = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
 993
 994     ::SetBkColor(hdc, wxColourToRGB(colBack));
 995     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
 996
 997     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
 998
 999     return (WXHBRUSH)brush->GetResourceHandle();
1000 }
1001
1002 // In WIN16, need to override normal erasing because
1003 // Ctl3D doesn't use the wxWindows background colour.
1004 #ifdef __WIN16__
1005 void wxTextCtrl::OnEraseBackground(wxEraseEvent& event)
1006 {
1007     wxColour col(m_backgroundColour);
1008
1009 #if wxUSE_CTL3D
1010     if (m_useCtl3D)
1011         col = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW);
1012 #endif
1013
1014     RECT rect;
1015     ::GetClientRect(GetHwnd(), &rect);
1016
1017     COLORREF ref = PALETTERGB(col.Red(),
1018                               col.Green(),
1019                               col.Blue());
1020     HBRUSH hBrush = ::CreateSolidBrush(ref);
1021     if ( !hBrush )
1022         wxLogLastError(wxT("CreateSolidBrush"));
1023
1024     HDC hdc = (HDC)event.GetDC()->GetHDC();
1025
1026     int mode = ::SetMapMode(hdc, MM_TEXT);
1027
1028     ::FillRect(hdc, &rect, hBrush);
1029     ::DeleteObject(hBrush);
1030     ::SetMapMode(hdc, mode);
1031
1032 }
1033 #endif
1034
1035 void wxTextCtrl::AdjustSpaceLimit()
1036 {
1037 #ifndef __WIN16__
1038     unsigned int len = ::GetWindowTextLength(GetHwnd()),
1039     limit = ::SendMessage(GetHwnd(), EM_GETLIMITTEXT, 0, 0);
1040     if ( len >= limit )
1041     {
1042         limit = len + 0x8000;    // 32Kb
1043
1044 #if wxUSE_RICHEDIT
1045         if ( m_isRich )
1046         {
1047             // as a nice side effect, this also allows passing limit > 64Kb
1048             ::SendMessage(GetHwnd(), EM_EXLIMITTEXT, 0, limit);
1049         }
1050         else
1051 #endif // wxUSE_RICHEDIT
1052         {
1053             if ( limit > 0xffff )
1054             {
1055                 // this will set it to a platform-dependent maximum (much more
1056                 // than 64Kb under NT)
1057                 limit = 0;
1058             }
1059
1060             ::SendMessage(GetHwnd(), EM_LIMITTEXT, limit, 0);
1061         }
1062     }
1063 #endif // !Win16
1064 }
1065
1066 bool wxTextCtrl::AcceptsFocus() const
1067 {
1068     // we don't want focus if we can't be edited
1069     return IsEditable() && wxControl::AcceptsFocus();
1070 }
1071
1072 wxSize wxTextCtrl::DoGetBestSize() const
1073 {
1074     int cx, cy;
1075     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
1076
1077     int wText = DEFAULT_ITEM_WIDTH;
1078
1079     int hText = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
1080     if ( m_windowStyle & wxTE_MULTILINE )
1081     {
1082         hText *= wxMax(GetNumberOfLines(), 5);
1083     }
1084     //else: for single line control everything is ok
1085
1086     return wxSize(wText, hText);
1087 }
1088
1089 // ----------------------------------------------------------------------------
1090 // standard handlers for standard edit menu events
1091 // ----------------------------------------------------------------------------
1092
1093 void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
1094 {
1095     Cut();
1096 }
1097
1098 void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
1099 {
1100     Copy();
1101 }
1102
1103 void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
1104 {
1105     Paste();
1106 }
1107
1108 void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
1109 {
1110     Undo();
1111 }
1112
1113 void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
1114 {
1115     Redo();
1116 }
1117
1118 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
1119 {
1120     event.Enable( CanCut() );
1121 }
1122
1123 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
1124 {
1125     event.Enable( CanCopy() );
1126 }
1127
1128 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
1129 {
1130     event.Enable( CanPaste() );
1131 }
1132
1133 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
1134 {
1135     event.Enable( CanUndo() );
1136 }
1137
1138 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
1139 {
1140     event.Enable( CanRedo() );
1141 }
1142
1143 // ----------------------------------------------------------------------------
1144 // colour setting for the rich edit controls
1145 // ----------------------------------------------------------------------------
1146
1147 #if wxUSE_RICHEDIT
1148
1149 // Watcom C++ doesn't define this
1150 #ifndef SCF_ALL
1151 #define SCF_ALL 0x0004
1152 #endif
1153
1154 bool wxTextCtrl::SetBackgroundColour(const wxColour& colour)
1155 {
1156     if ( !wxTextCtrlBase::SetBackgroundColour(colour) )
1157     {
1158         // colour didn't really change
1159         return FALSE;
1160     }
1161
1162     if ( IsRich() )
1163     {
1164         // rich edit doesn't use WM_CTLCOLOR, hence we need to send
1165         // EM_SETBKGNDCOLOR additionally
1166         ::SendMessage(GetHwnd(), EM_SETBKGNDCOLOR, 0, wxColourToRGB(colour));
1167     }
1168
1169     return TRUE;
1170 }
1171
1172 bool wxTextCtrl::SetForegroundColour(const wxColour& colour)
1173 {
1174     if ( !wxTextCtrlBase::SetForegroundColour(colour) )
1175     {
1176         // colour didn't really change
1177         return FALSE;
1178     }
1179
1180     if ( IsRich() )
1181     {
1182         // change the colour of everything
1183         CHARFORMAT cf;
1184         wxZeroMemory(cf);
1185         cf.cbSize = sizeof(cf);
1186         cf.dwMask = CFM_COLOR;
1187         cf.crTextColor = wxColourToRGB(colour);
1188         ::SendMessage(GetHwnd(), EM_SETCHARFORMAT, SCF_ALL, (LPARAM)&cf);
1189     }
1190
1191     return TRUE;
1192 }
1193
1194 #endif // wxUSE_RICHEDIT
1195
1196 // ----------------------------------------------------------------------------
1197 // wxRichEditModule
1198 // ----------------------------------------------------------------------------
1199
1200 #if wxUSE_RICHEDIT
1201
1202 bool wxRichEditModule::OnInit()
1203 {
1204     // don't do anything - we will load it when needed
1205     return TRUE;
1206 }
1207
1208 void wxRichEditModule::OnExit()
1209 {
1210     if ( ms_hRichEdit )
1211     {
1212         FreeLibrary(ms_hRichEdit);
1213     }
1214 }
1215
1216 /* static */
1217 bool wxRichEditModule::Load(int version)
1218 {
1219     wxCHECK_MSG( version >= 1 && version <= 3, FALSE,
1220                  _T("incorrect richedit control version requested") );
1221
1222     if ( version <= ms_verRichEdit )
1223     {
1224         // we've already got this or better
1225         return TRUE;
1226     }
1227
1228     if ( ms_hRichEdit )
1229     {
1230         ::FreeLibrary(ms_hRichEdit);
1231     }
1232
1233     // always try load riched20.dll first - like this we won't have to reload
1234     // it later if we're first asked for RE 1 and then for RE 2 or 3
1235     wxString dllname = _T("riched20.dll");
1236     ms_hRichEdit = ::LoadLibrary(dllname);
1237     ms_verRichEdit = 2; // no way to tell if it's 2 or 3, assume 2
1238
1239     if ( !ms_hRichEdit && (version == 1) )
1240     {
1241         // fall back to RE 1
1242         dllname = _T("riched32.dll");
1243         ms_hRichEdit = ::LoadLibrary(dllname);
1244         ms_verRichEdit = 1;
1245     }
1246
1247     if ( !ms_hRichEdit )
1248     {
1249         wxLogSysError(_("Could not load Rich Edit DLL '%s'"), dllname.c_str());
1250
1251         ms_verRichEdit = -1;
1252
1253         return FALSE;
1254     }
1255
1256     return TRUE;
1257 }
1258
1259 #endif // wxUSE_RICHEDIT
1260