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