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
  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     if ( parent )
 119         parent->AddChild(this);
 120
 121     // set colours
 122     SetupColours();
 123
 124     // translate wxWin style flags to MSW ones, checking for consistency while
 125     // doing it
 126     long msStyle = ES_LEFT | WS_VISIBLE | WS_CHILD | WS_TABSTOP;
 127     if ( m_windowStyle & wxTE_MULTILINE )
 128     {
 129         wxASSERT_MSG( !(m_windowStyle & wxTE_PROCESS_ENTER),
 130                       wxT("wxTE_PROCESS_ENTER style is ignored for multiline "
 131                           "text controls (they always process it)") );
 132
 133         msStyle |= ES_MULTILINE | ES_WANTRETURN;
 134         if ((m_windowStyle & wxTE_NO_VSCROLL) == 0)
 135             msStyle |= WS_VSCROLL;
 136         m_windowStyle |= wxTE_PROCESS_ENTER;
 137     }
 138     else
 139         msStyle |= ES_AUTOHSCROLL;
 140
 141     if (m_windowStyle & wxHSCROLL)
 142         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 143
 144     if (m_windowStyle & wxTE_READONLY)
 145         msStyle |= ES_READONLY;
 146
 147     if (m_windowStyle & wxHSCROLL)
 148         msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL);
 149     if (m_windowStyle & wxTE_PASSWORD) // hidden input
 150         msStyle |= ES_PASSWORD;
 151
 152     // we always want the characters and the arrows
 153     m_lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;
 154
 155     // we may have several different cases:
 156     // 1. normal case: both TAB and ENTER are used for dialog navigation
 157     // 2. ctrl which wants TAB for itself: ENTER is used to pass to the next
 158     //    control in the dialog
 159     // 3. ctrl which wants ENTER for itself: TAB is used for dialog navigation
 160     // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to pass to
 161     //    the next control
 162     if ( m_windowStyle & wxTE_PROCESS_ENTER )
 163         m_lDlgCode |= DLGC_WANTMESSAGE;
 164     if ( m_windowStyle & wxTE_PROCESS_TAB )
 165         m_lDlgCode |= DLGC_WANTTAB;
 166
 167     // do create the control - either an EDIT or RICHEDIT
 168     const wxChar *windowClass = wxT("EDIT");
 169
 170 #if wxUSE_RICHEDIT
 171     if ( m_windowStyle & wxTE_RICH )
 172     {
 173         static bool s_errorGiven = FALSE;   // MT-FIXME
 174
 175         // only give the error msg once if the DLL can't be loaded
 176         if ( !s_errorGiven )
 177         {
 178             // first try to load the RichEdit DLL (will do nothing if already
 179             // done)
 180             if ( !wxTheApp->InitRichEdit() )
 181             {
 182                 wxLogError(_("Impossible to create a rich edit control, "
 183                              "using simple text control instead."));
 184
 185                 s_errorGiven = TRUE;
 186             }
 187         }
 188
 189         if ( s_errorGiven )
 190         {
 191             m_isRich = FALSE;
 192         }
 193         else
 194         {
 195             msStyle |= ES_AUTOVSCROLL;
 196             m_isRich = TRUE;
 197             windowClass = wxT("RICHEDIT");
 198         }
 199     }
 200     else
 201         m_isRich = FALSE;
 202 #endif
 203
 204     bool want3D;
 205     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 206
 207     // Even with extended styles, need to combine with WS_BORDER for them to
 208     // look right.
 209     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 210         msStyle |= WS_BORDER;
 211
 212     // NB: don't use pos and size as CreateWindowEx arguments because they
 213     //     might be -1 in which case we should use the default values (and
 214     //     SetSize called below takes care of it)
 215     m_hWnd = (WXHWND)::CreateWindowEx(exStyle,
 216                                       windowClass,
 217                                       NULL,
 218                                       msStyle,
 219                                       0, 0, 0, 0,
 220                                       GetHwndOf(parent),
 221                                       (HMENU)m_windowId,
 222                                       wxGetInstance(),
 223                                       NULL);
 224
 225     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create text ctrl") );
 226
 227 #if wxUSE_CTL3D
 228     if ( want3D )
 229     {
 230         Ctl3dSubclassCtl(GetHwnd());
 231         m_useCtl3D = TRUE;
 232     }
 233 #endif
 234
 235 #if wxUSE_RICHEDIT
 236     if (m_isRich)
 237     {
 238         // Have to enable events
 239         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0,
 240                       ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 241     }
 242 #endif
 243
 244     SubclassWin(GetHWND());
 245
 246     // set font, position, size and initial value
 247     wxFont& fontParent = parent->GetFont();
 248     if ( fontParent.Ok() )
 249     {
 250         SetFont(fontParent);
 251     }
 252     else
 253     {
 254         SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 255     }
 256
 257     // Causes a crash for Symantec C++ and WIN32 for some reason
 258 #if !(defined(__SC__) && defined(__WIN32__))
 259     if ( !value.IsEmpty() )
 260     {
 261         SetValue(value);
 262     }
 263 #endif
 264
 265     SetSize(pos.x, pos.y, size.x, size.y);
 266
 267     return TRUE;
 268 }
 269
 270 // Make sure the window style (etc.) reflects the HWND style (roughly)
 271 void wxTextCtrl::AdoptAttributesFromHWND()
 272 {
 273   wxWindow::AdoptAttributesFromHWND();
 274
 275   HWND hWnd = GetHwnd();
 276   long style = GetWindowLong(hWnd, GWL_STYLE);
 277
 278   // retrieve the style to see whether this is an edit or richedit ctrl
 279 #if wxUSE_RICHEDIT
 280   wxChar buf[256];
 281
 282   GetClassName(hWnd, buf, WXSIZEOF(buf));
 283
 284   if ( wxStricmp(buf, wxT("EDIT")) == 0 )
 285     m_isRich = FALSE;
 286   else
 287     m_isRich = TRUE;
 288 #endif // wxUSE_RICHEDIT
 289
 290   if (style & ES_MULTILINE)
 291     m_windowStyle |= wxTE_MULTILINE;
 292   if (style & ES_PASSWORD)
 293     m_windowStyle |= wxTE_PASSWORD;
 294   if (style & ES_READONLY)
 295     m_windowStyle |= wxTE_READONLY;
 296   if (style & ES_WANTRETURN)
 297     m_windowStyle |= wxTE_PROCESS_ENTER;
 298 }
 299
 300 void wxTextCtrl::SetupColours()
 301 {
 302     // FIXME why is bg colour not inherited from parent?
 303     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 304     SetForegroundColour(GetParent()->GetForegroundColour());
 305 }
 306
 307 // ----------------------------------------------------------------------------
 308 // set/get the controls text
 309 // ----------------------------------------------------------------------------
 310
 311 wxString wxTextCtrl::GetValue() const
 312 {
 313     return wxGetWindowText(GetHWND());
 314 }
 315
 316 void wxTextCtrl::SetValue(const wxString& value)
 317 {
 318     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 319
 320     if ( valueDos != GetValue() )
 321     {
 322         SetWindowText(GetHwnd(), valueDos);
 323
 324         AdjustSpaceLimit();
 325     }
 326 }
 327
 328 void wxTextCtrl::WriteText(const wxString& value)
 329 {
 330     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 331
 332     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 333
 334     AdjustSpaceLimit();
 335 }
 336
 337 void wxTextCtrl::AppendText(const wxString& text)
 338 {
 339     SetInsertionPointEnd();
 340     WriteText(text);
 341 }
 342
 343 void wxTextCtrl::Clear()
 344 {
 345     SetWindowText(GetHwnd(), wxT(""));
 346 }
 347
 348 // ----------------------------------------------------------------------------
 349 // Clipboard operations
 350 // ----------------------------------------------------------------------------
 351
 352 void wxTextCtrl::Copy()
 353 {
 354     if (CanCopy())
 355     {
 356         HWND hWnd = GetHwnd();
 357         SendMessage(hWnd, WM_COPY, 0, 0L);
 358     }
 359 }
 360
 361 void wxTextCtrl::Cut()
 362 {
 363     if (CanCut())
 364     {
 365         HWND hWnd = GetHwnd();
 366         SendMessage(hWnd, WM_CUT, 0, 0L);
 367     }
 368 }
 369
 370 void wxTextCtrl::Paste()
 371 {
 372     if (CanPaste())
 373     {
 374         HWND hWnd = GetHwnd();
 375         SendMessage(hWnd, WM_PASTE, 0, 0L);
 376     }
 377 }
 378
 379 bool wxTextCtrl::CanCopy() const
 380 {
 381     // Can copy if there's a selection
 382     long from, to;
 383     GetSelection(& from, & to);
 384     return (from != to);
 385 }
 386
 387 bool wxTextCtrl::CanCut() const
 388 {
 389     // Can cut if there's a selection
 390     long from, to;
 391     GetSelection(& from, & to);
 392     return (from != to);
 393 }
 394
 395 bool wxTextCtrl::CanPaste() const
 396 {
 397 #if wxUSE_RICHEDIT
 398     if (m_isRich)
 399     {
 400         int dataFormat = 0; // 0 == any format
 401         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 402     }
 403 #endif
 404     if (!IsEditable())
 405         return FALSE;
 406
 407     // Standard edit control: check for straight text on clipboard
 408     bool isTextAvailable = FALSE;
 409     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 410     {
 411         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 412         ::CloseClipboard();
 413     }
 414
 415     return isTextAvailable;
 416 }
 417
 418 // ----------------------------------------------------------------------------
 419 // Accessors
 420 // ----------------------------------------------------------------------------
 421
 422 void wxTextCtrl::SetEditable(bool editable)
 423 {
 424     HWND hWnd = GetHwnd();
 425     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 426 }
 427
 428 void wxTextCtrl::SetInsertionPoint(long pos)
 429 {
 430     HWND hWnd = GetHwnd();
 431 #ifdef __WIN32__
 432 #if wxUSE_RICHEDIT
 433     if ( m_isRich)
 434     {
 435         CHARRANGE range;
 436         range.cpMin = pos;
 437         range.cpMax = pos;
 438         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 439         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 440     }
 441     else
 442 #endif // wxUSE_RICHEDIT
 443     {
 444         SendMessage(hWnd, EM_SETSEL, pos, pos);
 445         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 446     }
 447 #else // Win16
 448     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 449 #endif // Win32/16
 450
 451     static const char *nothing = "";
 452     SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 453 }
 454
 455 void wxTextCtrl::SetInsertionPointEnd()
 456 {
 457     long pos = GetLastPosition();
 458     SetInsertionPoint(pos);
 459 }
 460
 461 long wxTextCtrl::GetInsertionPoint() const
 462 {
 463 #if wxUSE_RICHEDIT
 464     if (m_isRich)
 465     {
 466         CHARRANGE range;
 467         range.cpMin = 0;
 468         range.cpMax = 0;
 469         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 470         return range.cpMin;
 471     }
 472 #endif
 473
 474     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 475     return Pos & 0xFFFF;
 476 }
 477
 478 long wxTextCtrl::GetLastPosition() const
 479 {
 480     HWND hWnd = GetHwnd();
 481
 482     // Will always return a number > 0 (according to docs)
 483     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 484
 485     // This gets the char index for the _beginning_ of the last line
 486     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 487
 488     // Get number of characters in the last line. We'll add this to the character
 489     // index for the last line, 1st position.
 490     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 491
 492     return (long)(charIndex + lineLength);
 493 }
 494
 495 // If the return values from and to are the same, there is no
 496 // selection.
 497 void wxTextCtrl::GetSelection(long* from, long* to) const
 498 {
 499 #if wxUSE_RICHEDIT
 500     if (m_isRich)
 501     {
 502         CHARRANGE charRange;
 503         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 504
 505         *from = charRange.cpMin;
 506         *to = charRange.cpMax;
 507
 508         return;
 509     }
 510 #endif
 511     DWORD dwStart, dwEnd;
 512     WPARAM wParam = (WPARAM) (DWORD*) & dwStart; // receives starting position
 513     LPARAM lParam = (LPARAM) (DWORD*) & dwEnd;   // receives ending position
 514
 515     ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 516
 517     *from = dwStart;
 518     *to = dwEnd;
 519 }
 520
 521 bool wxTextCtrl::IsEditable() const
 522 {
 523     long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);
 524
 525     return ((style & ES_READONLY) == 0);
 526 }
 527
 528 // ----------------------------------------------------------------------------
 529 // Editing
 530 // ----------------------------------------------------------------------------
 531
 532 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 533 {
 534 #if wxUSE_CLIPBOARD
 535     HWND hWnd = GetHwnd();
 536     long fromChar = from;
 537     long toChar = to;
 538
 539     // Set selection and remove it
 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     // Now replace with 'value', by pasting.
 548     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const wxChar *)value, 0, 0);
 549
 550     // Paste into edit control
 551     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 552 #else
 553     wxFAIL_MSG("wxTextCtrl::Replace not implemented if wxUSE_CLIPBOARD is 0.");
 554 #endif
 555 }
 556
 557 void wxTextCtrl::Remove(long from, long to)
 558 {
 559     HWND hWnd = GetHwnd();
 560     long fromChar = from;
 561     long toChar = to;
 562
 563     // Cut all selected text
 564 #ifdef __WIN32__
 565     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 566 #else
 567     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 568 #endif
 569     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 570 }
 571
 572 void wxTextCtrl::SetSelection(long from, long to)
 573 {
 574     HWND hWnd = GetHwnd();
 575     long fromChar = from;
 576     long toChar = to;
 577
 578     // if from and to are both -1, it means (in wxWindows) that all text should
 579     // be selected. Translate into Windows convention
 580     if ((from == -1) && (to == -1))
 581     {
 582       fromChar = 0;
 583       toChar = -1;
 584     }
 585
 586 #ifdef __WIN32__
 587     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 588     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 589 #else
 590     // WPARAM is 0: selection is scrolled into view
 591     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 592 #endif
 593 }
 594
 595 bool wxTextCtrl::LoadFile(const wxString& file)
 596 {
 597     if ( wxTextCtrlBase::LoadFile(file) )
 598     {
 599         // update the size limit if needed
 600         AdjustSpaceLimit();
 601
 602         return TRUE;
 603     }
 604
 605     return FALSE;
 606 }
 607
 608 bool wxTextCtrl::IsModified() const
 609 {
 610     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 611 }
 612
 613 // Makes 'unmodified'
 614 void wxTextCtrl::DiscardEdits()
 615 {
 616     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 617 }
 618
 619 int wxTextCtrl::GetNumberOfLines() const
 620 {
 621     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 622 }
 623
 624 long wxTextCtrl::XYToPosition(long x, long y) const
 625 {
 626     HWND hWnd = GetHwnd();
 627
 628     // This gets the char index for the _beginning_ of this line
 629     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 630     return (long)(x + charIndex);
 631 }
 632
 633 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 634 {
 635     HWND hWnd = GetHwnd();
 636
 637     // This gets the line number containing the character
 638     int lineNo;
 639 #if wxUSE_RICHEDIT
 640     if ( m_isRich )
 641     {
 642         lineNo = (int)SendMessage(hWnd, EM_EXLINEFROMCHAR, 0, (LPARAM)pos);
 643     }
 644     else
 645 #endif // wxUSE_RICHEDIT
 646         lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, 0);
 647
 648     if ( lineNo == -1 )
 649     {
 650         // no such line
 651         return FALSE;
 652     }
 653
 654     // This gets the char index for the _beginning_ of this line
 655     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 656     if ( charIndex == -1 )
 657     {
 658         return FALSE;
 659     }
 660
 661     // The X position must therefore be the different between pos and charIndex
 662     if ( x )
 663         *x = (long)(pos - charIndex);
 664     if ( y )
 665         *y = (long)lineNo;
 666
 667     return TRUE;
 668 }
 669
 670 void wxTextCtrl::ShowPosition(long pos)
 671 {
 672     HWND hWnd = GetHwnd();
 673
 674     // To scroll to a position, we pass the number of lines and characters
 675     // to scroll *by*. This means that we need to:
 676     // (1) Find the line position of the current line.
 677     // (2) Find the line position of pos.
 678     // (3) Scroll by (pos - current).
 679     // For now, ignore the horizontal scrolling.
 680
 681     // Is this where scrolling is relative to - the line containing the caret?
 682     // Or is the first visible line??? Try first visible line.
 683 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 684
 685     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 686
 687     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 688
 689     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 690
 691     if (linesToScroll != 0)
 692       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 693 }
 694
 695 int wxTextCtrl::GetLineLength(long lineNo) const
 696 {
 697     long charIndex = XYToPosition(0, lineNo);
 698     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 699     return len;
 700 }
 701
 702 wxString wxTextCtrl::GetLineText(long lineNo) const
 703 {
 704     size_t len = (size_t)GetLineLength(lineNo) + 1;
 705     char *buf = (char *)malloc(len);
 706     *(WORD *)buf = len;
 707     int noChars = (int)SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 708     buf[noChars] = 0;
 709
 710     wxString str(buf);
 711
 712     free(buf);
 713
 714     return str;
 715 }
 716
 717 // ----------------------------------------------------------------------------
 718 // Undo/redo
 719 // ----------------------------------------------------------------------------
 720
 721 void wxTextCtrl::Undo()
 722 {
 723     if (CanUndo())
 724     {
 725         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 726     }
 727 }
 728
 729 void wxTextCtrl::Redo()
 730 {
 731     if (CanRedo())
 732     {
 733         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 734         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 735     }
 736 }
 737
 738 bool wxTextCtrl::CanUndo() const
 739 {
 740     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 741 }
 742
 743 bool wxTextCtrl::CanRedo() const
 744 {
 745     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 746 }
 747
 748 // ----------------------------------------------------------------------------
 749 // implemenation details
 750 // ----------------------------------------------------------------------------
 751
 752 void wxTextCtrl::Command(wxCommandEvent & event)
 753 {
 754     SetValue(event.GetString());
 755     ProcessCommand (event);
 756 }
 757
 758 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 759 {
 760     // By default, load the first file into the text window.
 761     if (event.GetNumberOfFiles() > 0)
 762     {
 763         LoadFile(event.GetFiles()[0]);
 764     }
 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() const
 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