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/log.h"
  37 #endif
  38
  39 #if wxUSE_CLIPBOARD
  40     #include "wx/app.h"
  41     #include "wx/clipbrd.h"
  42 #endif
  43
  44 #include "wx/textfile.h"
  45
  46 #include <windowsx.h>
  47
  48 #include "wx/msw/private.h"
  49
  50 #include <string.h>
  51 #include <stdlib.h>
  52 #include <sys/types.h>
  53
  54 #if wxUSE_IOSTREAMH
  55 #   include <fstream.h>
  56 #else
  57 #   include <fstream>
  58 #endif
  59
  60 #if wxUSE_RICHEDIT && (!defined(__GNUWIN32__) || defined(wxUSE_NORLANDER_HEADERS))
  61     #include <richedit.h>
  62 #endif
  63
  64 #if !USE_SHARED_LIBRARY
  65
  66 // ----------------------------------------------------------------------------
  67 // event tables and other macros
  68 // ----------------------------------------------------------------------------
  69
  70 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  71
  72 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  73     EVT_CHAR(wxTextCtrl::OnChar)
  74     EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  75
  76     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
  77     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
  78     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
  79     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
  80     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
  81
  82     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
  83     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
  84     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
  85     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
  86     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
  87 END_EVENT_TABLE()
  88
  89 #endif // USE_SHARED_LIBRARY
  90
  91 // ============================================================================
  92 // implementation
  93 // ============================================================================
  94
  95 // ----------------------------------------------------------------------------
  96 // creation
  97 // ----------------------------------------------------------------------------
  98
  99 wxTextCtrl::wxTextCtrl()
 100 {
 101 #if wxUSE_RICHEDIT
 102     m_isRich = FALSE;
 103 #endif
 104 }
 105
 106 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
 107                         const wxString& value,
 108                         const wxPoint& pos,
 109                         const wxSize& size,
 110                         long style,
 111                         const wxValidator& validator,
 112                         const wxString& name)
 113 {
 114     // base initialization
 115     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
 116         return FALSE;
 117
 118     // Validator was set in CreateBase
 119     //SetValidator(validator);
 120     if ( parent )
 121         parent->AddChild(this);
 122
 123     // set colours
 124     SetupColours();
 125
 126     // translate wxWin style flags to MSW ones, checking for consistency while
 127     // doing it
 128     long msStyle = ES_LEFT | WS_VISIBLE | WS_CHILD | WS_TABSTOP;
 129     if ( m_windowStyle & wxTE_MULTILINE )
 130     {
 131         wxASSERT_MSG( !(m_windowStyle & wxTE_PROCESS_ENTER),
 132                       wxT("wxTE_PROCESS_ENTER style is ignored for multiline "
 133                          "text controls (they always process it)") );
 134
 135         msStyle |= ES_MULTILINE | ES_WANTRETURN;
 136         if ((m_windowStyle & wxTE_NO_VSCROLL) == 0)
 137             msStyle |= WS_VSCROLL;
 138         m_windowStyle |= wxTE_PROCESS_ENTER;
 139     }
 140     else
 141         msStyle |= ES_AUTOHSCROLL;
 142
 143     if (m_windowStyle & wxHSCROLL)
 144         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 145
 146     if (m_windowStyle & wxTE_READONLY)
 147         msStyle |= ES_READONLY;
 148
 149     if (m_windowStyle & wxHSCROLL)
 150         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 151     if (m_windowStyle & wxTE_PASSWORD) // hidden input
 152         msStyle |= ES_PASSWORD;
 153
 154     // we always want the characters and the arrows
 155     m_lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;
 156
 157     // we may have several different cases:
 158     // 1. normal case: both TAB and ENTER are used for dialog navigation
 159     // 2. ctrl which wants TAB for itself: ENTER is used to pass to the next
 160     //    control in the dialog
 161     // 3. ctrl which wants ENTER for itself: TAB is used for dialog navigation
 162     // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to pass to
 163     //    the next control
 164     if ( m_windowStyle & wxTE_PROCESS_ENTER )
 165         m_lDlgCode |= DLGC_WANTMESSAGE;
 166     if ( m_windowStyle & wxTE_PROCESS_TAB )
 167         m_lDlgCode |= DLGC_WANTTAB;
 168
 169     // do create the control - either an EDIT or RICHEDIT
 170     const wxChar *windowClass = wxT("EDIT");
 171
 172 #if wxUSE_RICHEDIT
 173     if ( m_windowStyle & wxTE_RICH )
 174     {
 175         msStyle |= ES_AUTOVSCROLL;
 176         m_isRich = TRUE;
 177         windowClass = wxT("RICHEDIT");
 178     }
 179     else
 180         m_isRich = FALSE;
 181 #endif
 182
 183     bool want3D;
 184     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 185
 186     // Even with extended styles, need to combine with WS_BORDER for them to
 187     // look right.
 188     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 189         msStyle |= WS_BORDER;
 190
 191     // NB: don't use pos and size as CreateWindowEx arguments because they
 192     //     might be -1 in which case we should use the default values (and
 193     //     SetSize called below takes care of it)
 194     m_hWnd = (WXHWND)::CreateWindowEx(exStyle,
 195                                       windowClass,
 196                                       NULL,
 197                                       msStyle,
 198                                       0, 0, 0, 0,
 199                                       GetHwndOf(parent),
 200                                       (HMENU)m_windowId,
 201                                       wxGetInstance(),
 202                                       NULL);
 203
 204     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create text ctrl") );
 205
 206 #if wxUSE_CTL3D
 207     if ( want3D )
 208     {
 209         Ctl3dSubclassCtl(GetHwnd());
 210         m_useCtl3D = TRUE;
 211     }
 212 #endif
 213
 214 #if wxUSE_RICHEDIT
 215     if (m_isRich)
 216     {
 217         // Have to enable events
 218         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0,
 219                       ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 220     }
 221 #endif
 222
 223     SubclassWin(GetHWND());
 224
 225     // set font, position, size and initial value
 226     wxFont& fontParent = parent->GetFont();
 227     if ( fontParent.Ok() )
 228     {
 229         SetFont(fontParent);
 230     }
 231     else
 232     {
 233         SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 234     }
 235
 236     // Causes a crash for Symantec C++ and WIN32 for some reason
 237 #if !(defined(__SC__) && defined(__WIN32__))
 238     if ( !value.IsEmpty() )
 239     {
 240         SetValue(value);
 241     }
 242 #endif
 243
 244     SetSize(pos.x, pos.y, size.x, size.y);
 245
 246     return TRUE;
 247 }
 248
 249 // Make sure the window style (etc.) reflects the HWND style (roughly)
 250 void wxTextCtrl::AdoptAttributesFromHWND()
 251 {
 252   wxWindow::AdoptAttributesFromHWND();
 253
 254   HWND hWnd = GetHwnd();
 255   long style = GetWindowLong(hWnd, GWL_STYLE);
 256
 257   // retrieve the style to see whether this is an edit or richedit ctrl
 258 #if wxUSE_RICHEDIT
 259   wxChar buf[256];
 260
 261   GetClassName(hWnd, buf, WXSIZEOF(buf));
 262
 263   if ( wxStricmp(buf, wxT("EDIT")) == 0 )
 264     m_isRich = FALSE;
 265   else
 266     m_isRich = TRUE;
 267 #endif // wxUSE_RICHEDIT
 268
 269   if (style & ES_MULTILINE)
 270     m_windowStyle |= wxTE_MULTILINE;
 271   if (style & ES_PASSWORD)
 272     m_windowStyle |= wxTE_PASSWORD;
 273   if (style & ES_READONLY)
 274     m_windowStyle |= wxTE_READONLY;
 275   if (style & ES_WANTRETURN)
 276     m_windowStyle |= wxTE_PROCESS_ENTER;
 277 }
 278
 279 void wxTextCtrl::SetupColours()
 280 {
 281     // FIXME why is bg colour not inherited from parent?
 282     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 283     SetForegroundColour(GetParent()->GetForegroundColour());
 284 }
 285
 286 // ----------------------------------------------------------------------------
 287 // set/get the controls text
 288 // ----------------------------------------------------------------------------
 289
 290 wxString wxTextCtrl::GetValue() const
 291 {
 292     return wxGetWindowText(GetHWND());
 293 }
 294
 295 void wxTextCtrl::SetValue(const wxString& value)
 296 {
 297     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 298
 299     SetWindowText(GetHwnd(), valueDos);
 300
 301     AdjustSpaceLimit();
 302 }
 303
 304 void wxTextCtrl::WriteText(const wxString& value)
 305 {
 306     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 307
 308     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 309
 310     AdjustSpaceLimit();
 311 }
 312
 313 void wxTextCtrl::AppendText(const wxString& text)
 314 {
 315     SetInsertionPointEnd();
 316     WriteText(text);
 317 }
 318
 319 void wxTextCtrl::Clear()
 320 {
 321     SetWindowText(GetHwnd(), wxT(""));
 322 }
 323
 324 // ----------------------------------------------------------------------------
 325 // Clipboard operations
 326 // ----------------------------------------------------------------------------
 327
 328 void wxTextCtrl::Copy()
 329 {
 330     if (CanCopy())
 331     {
 332         HWND hWnd = GetHwnd();
 333         SendMessage(hWnd, WM_COPY, 0, 0L);
 334     }
 335 }
 336
 337 void wxTextCtrl::Cut()
 338 {
 339     if (CanCut())
 340     {
 341         HWND hWnd = GetHwnd();
 342         SendMessage(hWnd, WM_CUT, 0, 0L);
 343     }
 344 }
 345
 346 void wxTextCtrl::Paste()
 347 {
 348     if (CanPaste())
 349     {
 350         HWND hWnd = GetHwnd();
 351         SendMessage(hWnd, WM_PASTE, 0, 0L);
 352     }
 353 }
 354
 355 bool wxTextCtrl::CanCopy() const
 356 {
 357     // Can copy if there's a selection
 358     long from, to;
 359     GetSelection(& from, & to);
 360     return (from != to);
 361 }
 362
 363 bool wxTextCtrl::CanCut() const
 364 {
 365     // Can cut if there's a selection
 366     long from, to;
 367     GetSelection(& from, & to);
 368     return (from != to);
 369 }
 370
 371 bool wxTextCtrl::CanPaste() const
 372 {
 373 #if wxUSE_RICHEDIT
 374     if (m_isRich)
 375     {
 376         int dataFormat = 0; // 0 == any format
 377         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 378     }
 379 #endif
 380     if (!IsEditable())
 381         return FALSE;
 382
 383     // Standard edit control: check for straight text on clipboard
 384     bool isTextAvailable = FALSE;
 385     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 386     {
 387         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 388         ::CloseClipboard();
 389     }
 390
 391     return isTextAvailable;
 392 }
 393
 394 // ----------------------------------------------------------------------------
 395 // Accessors
 396 // ----------------------------------------------------------------------------
 397
 398 void wxTextCtrl::SetEditable(bool editable)
 399 {
 400     HWND hWnd = GetHwnd();
 401     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 402 }
 403
 404 void wxTextCtrl::SetInsertionPoint(long pos)
 405 {
 406     HWND hWnd = GetHwnd();
 407 #ifdef __WIN32__
 408 #if wxUSE_RICHEDIT
 409     if ( m_isRich)
 410     {
 411         CHARRANGE range;
 412         range.cpMin = pos;
 413         range.cpMax = pos;
 414         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 415         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 416     }
 417     else
 418 #endif // wxUSE_RICHEDIT
 419     {
 420         SendMessage(hWnd, EM_SETSEL, pos, pos);
 421         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 422     }
 423 #else // Win16
 424     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 425 #endif // Win32/16
 426
 427     static const char *nothing = "";
 428     SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 429 }
 430
 431 void wxTextCtrl::SetInsertionPointEnd()
 432 {
 433     long pos = GetLastPosition();
 434     SetInsertionPoint(pos);
 435 }
 436
 437 long wxTextCtrl::GetInsertionPoint() const
 438 {
 439 #if wxUSE_RICHEDIT
 440     if (m_isRich)
 441     {
 442         CHARRANGE range;
 443         range.cpMin = 0;
 444         range.cpMax = 0;
 445         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 446         return range.cpMin;
 447     }
 448 #endif
 449
 450     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 451     return Pos & 0xFFFF;
 452 }
 453
 454 long wxTextCtrl::GetLastPosition() const
 455 {
 456     HWND hWnd = GetHwnd();
 457
 458     // Will always return a number > 0 (according to docs)
 459     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 460
 461     // This gets the char index for the _beginning_ of the last line
 462     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 463
 464     // Get number of characters in the last line. We'll add this to the character
 465     // index for the last line, 1st position.
 466     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 467
 468     return (long)(charIndex + lineLength);
 469 }
 470
 471 // If the return values from and to are the same, there is no
 472 // selection.
 473 void wxTextCtrl::GetSelection(long* from, long* to) const
 474 {
 475 #if wxUSE_RICHEDIT
 476     if (m_isRich)
 477     {
 478         CHARRANGE charRange;
 479         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 480
 481         *from = charRange.cpMin;
 482         *to = charRange.cpMax;
 483
 484         return;
 485     }
 486 #endif
 487     DWORD dwStart, dwEnd;
 488     WPARAM wParam = (WPARAM) (DWORD*) & dwStart; // receives starting position
 489     LPARAM lParam = (LPARAM) (DWORD*) & dwEnd;   // receives ending position
 490
 491     ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 492
 493     *from = dwStart;
 494     *to = dwEnd;
 495 }
 496
 497 bool wxTextCtrl::IsEditable() const
 498 {
 499     long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);
 500
 501     return ((style & ES_READONLY) == 0);
 502 }
 503
 504 // ----------------------------------------------------------------------------
 505 // Editing
 506 // ----------------------------------------------------------------------------
 507
 508 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 509 {
 510 #if wxUSE_CLIPBOARD
 511     HWND hWnd = GetHwnd();
 512     long fromChar = from;
 513     long toChar = to;
 514
 515     // Set selection and remove it
 516 #ifdef __WIN32__
 517     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 518 #else
 519     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 520 #endif
 521     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 522
 523     // Now replace with 'value', by pasting.
 524     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const wxChar *)value, 0, 0);
 525
 526     // Paste into edit control
 527     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 528 #else
 529     wxFAIL_MSG("wxTextCtrl::Replace not implemented if wxUSE_CLIPBOARD is 0.");
 530 #endif
 531 }
 532
 533 void wxTextCtrl::Remove(long from, long to)
 534 {
 535     HWND hWnd = GetHwnd();
 536     long fromChar = from;
 537     long toChar = to;
 538
 539     // Cut all selected text
 540 #ifdef __WIN32__
 541     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 542 #else
 543     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 544 #endif
 545     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 546 }
 547
 548 void wxTextCtrl::SetSelection(long from, long to)
 549 {
 550     HWND hWnd = GetHwnd();
 551     long fromChar = from;
 552     long toChar = to;
 553
 554     // if from and to are both -1, it means (in wxWindows) that all text should
 555     // be selected. Translate into Windows convention
 556     if ((from == -1) && (to == -1))
 557     {
 558       fromChar = 0;
 559       toChar = -1;
 560     }
 561
 562 #ifdef __WIN32__
 563     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 564     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 565 #else
 566     // WPARAM is 0: selection is scrolled into view
 567     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 568 #endif
 569 }
 570
 571 bool wxTextCtrl::LoadFile(const wxString& file)
 572 {
 573     if ( wxTextCtrlBase::LoadFile(file) )
 574     {
 575         // update the size limit if needed
 576         AdjustSpaceLimit();
 577
 578         return TRUE;
 579     }
 580
 581     return FALSE;
 582 }
 583
 584 bool wxTextCtrl::IsModified() const
 585 {
 586     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 587 }
 588
 589 // Makes 'unmodified'
 590 void wxTextCtrl::DiscardEdits()
 591 {
 592     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 593 }
 594
 595 int wxTextCtrl::GetNumberOfLines() const
 596 {
 597     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 598 }
 599
 600 long wxTextCtrl::XYToPosition(long x, long y) const
 601 {
 602     HWND hWnd = GetHwnd();
 603
 604     // This gets the char index for the _beginning_ of this line
 605     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 606     return (long)(x + charIndex);
 607 }
 608
 609 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 610 {
 611     HWND hWnd = GetHwnd();
 612
 613     // This gets the line number containing the character
 614     int lineNo;
 615 #if wxUSE_RICHEDIT
 616     if ( m_isRich )
 617     {
 618         lineNo = (int)SendMessage(hWnd, EM_EXLINEFROMCHAR, 0, (LPARAM)pos);
 619     }
 620     else
 621 #endif // wxUSE_RICHEDIT
 622         lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, 0);
 623
 624     if ( lineNo == -1 )
 625     {
 626         // no such line
 627         return FALSE;
 628     }
 629
 630     // This gets the char index for the _beginning_ of this line
 631     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 632     if ( charIndex == -1 )
 633     {
 634         return FALSE;
 635     }
 636
 637     // The X position must therefore be the different between pos and charIndex
 638     if ( x )
 639         *x = (long)(pos - charIndex);
 640     if ( y )
 641         *y = (long)lineNo;
 642
 643     return TRUE;
 644 }
 645
 646 void wxTextCtrl::ShowPosition(long pos)
 647 {
 648     HWND hWnd = GetHwnd();
 649
 650     // To scroll to a position, we pass the number of lines and characters
 651     // to scroll *by*. This means that we need to:
 652     // (1) Find the line position of the current line.
 653     // (2) Find the line position of pos.
 654     // (3) Scroll by (pos - current).
 655     // For now, ignore the horizontal scrolling.
 656
 657     // Is this where scrolling is relative to - the line containing the caret?
 658     // Or is the first visible line??? Try first visible line.
 659 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 660
 661     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 662
 663     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 664
 665     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 666
 667     if (linesToScroll != 0)
 668       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 669 }
 670
 671 int wxTextCtrl::GetLineLength(long lineNo) const
 672 {
 673     long charIndex = XYToPosition(0, lineNo);
 674     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 675     return len;
 676 }
 677
 678 wxString wxTextCtrl::GetLineText(long lineNo) const
 679 {
 680     size_t len = (size_t)GetLineLength(lineNo) + 1;
 681     char *buf = (char *)malloc(len);
 682     *(WORD *)buf = len;
 683     int noChars = (int)SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 684     buf[noChars] = 0;
 685
 686     wxString str(buf);
 687
 688     free(buf);
 689
 690     return str;
 691 }
 692
 693 // ----------------------------------------------------------------------------
 694 // Undo/redo
 695 // ----------------------------------------------------------------------------
 696
 697 void wxTextCtrl::Undo()
 698 {
 699     if (CanUndo())
 700     {
 701         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 702     }
 703 }
 704
 705 void wxTextCtrl::Redo()
 706 {
 707     if (CanRedo())
 708     {
 709         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 710         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 711     }
 712 }
 713
 714 bool wxTextCtrl::CanUndo() const
 715 {
 716     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 717 }
 718
 719 bool wxTextCtrl::CanRedo() const
 720 {
 721     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 722 }
 723
 724 // ----------------------------------------------------------------------------
 725 // implemenation details
 726 // ----------------------------------------------------------------------------
 727
 728 void wxTextCtrl::Command(wxCommandEvent & event)
 729 {
 730     SetValue(event.GetString());
 731     ProcessCommand (event);
 732 }
 733
 734 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 735 {
 736     // By default, load the first file into the text window.
 737     if (event.GetNumberOfFiles() > 0)
 738     {
 739         LoadFile(event.GetFiles()[0]);
 740     }
 741 }
 742
 743 WXHBRUSH wxTextCtrl::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 744                                 WXUINT message, WXWPARAM wParam,
 745                                 WXLPARAM lParam)
 746 {
 747 #if wxUSE_CTL3D
 748     if ( m_useCtl3D )
 749     {
 750         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 751         return (WXHBRUSH) hbrush;
 752     }
 753 #endif
 754
 755     HDC hdc = (HDC)pDC;
 756     SetBkMode(hdc, GetParent()->GetTransparentBackground() ? TRANSPARENT
 757                                                            : OPAQUE);
 758
 759     ::SetBkColor(hdc, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 760     ::SetTextColor(hdc, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 761
 762     wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 763
 764     return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 765 }
 766
 767 void wxTextCtrl::OnChar(wxKeyEvent& event)
 768 {
 769     switch ( event.KeyCode() )
 770     {
 771         case WXK_RETURN:
 772             if ( !(m_windowStyle & wxTE_MULTILINE) )
 773             {
 774                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 775                 event.SetEventObject( this );
 776                 if ( GetEventHandler()->ProcessEvent(event) )
 777                     return;
 778             }
 779             //else: multiline controls need Enter for themselves
 780
 781             break;
 782
 783         case WXK_TAB:
 784             // always produce navigation event - even if we process TAB
 785             // ourselves the fact that we got here means that the user code
 786             // decided to skip processing of this TAB - probably to let it
 787             // do its default job.
 788             //
 789             // NB: Notice that Ctrl-Tab is handled elsewhere and Alt-Tab is
 790             //     handled by Windows
 791             {
 792                 wxNavigationKeyEvent eventNav;
 793                 eventNav.SetDirection(!event.ShiftDown());
 794                 eventNav.SetWindowChange(FALSE);
 795                 eventNav.SetEventObject(this);
 796
 797                 if ( GetEventHandler()->ProcessEvent(eventNav) )
 798                     return;
 799             }
 800             break;
 801
 802         default:
 803             event.Skip();
 804             return;
 805     }
 806
 807     // don't just call event.Skip() because this will cause TABs and ENTERs
 808     // be passed upwards and we don't always want this - instead process it
 809     // right here
 810
 811     // FIXME
 812     event.Skip();
 813 }
 814
 815 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 816 {
 817     switch (param)
 818     {
 819         case EN_SETFOCUS:
 820         case EN_KILLFOCUS:
 821             {
 822                 wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
 823                         : wxEVT_SET_FOCUS,
 824                         m_windowId);
 825                 event.SetEventObject( this );
 826                 GetEventHandler()->ProcessEvent(event);
 827             }
 828             break;
 829
 830         case EN_CHANGE:
 831             {
 832                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
 833                 wxString val(GetValue());
 834                 if ( !val.IsNull() )
 835                     event.m_commandString = WXSTRINGCAST val;
 836                 event.SetEventObject( this );
 837                 ProcessCommand(event);
 838             }
 839             break;
 840
 841         case EN_ERRSPACE:
 842             // the text size limit has been hit - increase it
 843             AdjustSpaceLimit();
 844             break;
 845
 846             // the other notification messages are not processed
 847         case EN_UPDATE:
 848         case EN_MAXTEXT:
 849         case EN_HSCROLL:
 850         case EN_VSCROLL:
 851         default:
 852             return FALSE;
 853     }
 854
 855     // processed
 856     return TRUE;
 857 }
 858
 859 void wxTextCtrl::AdjustSpaceLimit()
 860 {
 861 #ifndef __WIN16__
 862     unsigned int len = ::GetWindowTextLength(GetHwnd()),
 863     limit = ::SendMessage(GetHwnd(), EM_GETLIMITTEXT, 0, 0);
 864     if ( len > limit )
 865     {
 866         limit = len + 0x8000;    // 32Kb
 867
 868 #if wxUSE_RICHEDIT
 869         if ( m_isRich || limit > 0xffff )
 870 #else
 871         if ( limit > 0xffff )
 872 #endif
 873             ::SendMessage(GetHwnd(), EM_LIMITTEXT, 0, limit);
 874         else
 875             ::SendMessage(GetHwnd(), EM_LIMITTEXT, limit, 0);
 876     }
 877 #endif
 878 }
 879
 880 bool wxTextCtrl::AcceptsFocus() const
 881 {
 882     // we don't want focus if we can't be edited
 883     return IsEditable() && wxControl::AcceptsFocus();
 884 }
 885
 886 wxSize wxTextCtrl::DoGetBestSize()
 887 {
 888     int cx, cy;
 889     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 890
 891     int wText = DEFAULT_ITEM_WIDTH;
 892
 893     int hText = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 894     if ( m_windowStyle & wxTE_MULTILINE )
 895     {
 896         hText *= wxMin(GetNumberOfLines(), 5);
 897     }
 898     //else: for single line control everything is ok
 899
 900     return wxSize(wText, hText);
 901 }
 902
 903 // ----------------------------------------------------------------------------
 904 // standard handlers for standard edit menu events
 905 // ----------------------------------------------------------------------------
 906
 907 void wxTextCtrl::OnCut(wxCommandEvent& event)
 908 {
 909     Cut();
 910 }
 911
 912 void wxTextCtrl::OnCopy(wxCommandEvent& event)
 913 {
 914     Copy();
 915 }
 916
 917 void wxTextCtrl::OnPaste(wxCommandEvent& event)
 918 {
 919     Paste();
 920 }
 921
 922 void wxTextCtrl::OnUndo(wxCommandEvent& event)
 923 {
 924     Undo();
 925 }
 926
 927 void wxTextCtrl::OnRedo(wxCommandEvent& event)
 928 {
 929     Redo();
 930 }
 931
 932 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
 933 {
 934     event.Enable( CanCut() );
 935 }
 936
 937 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
 938 {
 939     event.Enable( CanCopy() );
 940 }
 941
 942 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
 943 {
 944     event.Enable( CanPaste() );
 945 }
 946
 947 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
 948 {
 949     event.Enable( CanUndo() );
 950 }
 951
 952 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
 953 {
 954     event.Enable( CanRedo() );
 955 }
 956