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