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