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/intl.h"
  37     #include "wx/log.h"
  38     #include "wx/app.h"
  39 #endif
  40
  41 #if wxUSE_CLIPBOARD
  42     #include "wx/clipbrd.h"
  43 #endif
  44
  45 #include "wx/textfile.h"
  46
  47 #include <windowsx.h>
  48
  49 #include "wx/msw/private.h"
  50
  51 #include <string.h>
  52 #include <stdlib.h>
  53 #include <sys/types.h>
  54
  55 #if wxUSE_IOSTREAMH
  56 #   include <fstream.h>
  57 #else
  58 #   include <fstream>
  59 #endif
  60
  61 #if wxUSE_RICHEDIT
  62     #include <richedit.h>
  63 #endif
  64
  65 #if !USE_SHARED_LIBRARY
  66
  67 // ----------------------------------------------------------------------------
  68 // event tables and other macros
  69 // ----------------------------------------------------------------------------
  70
  71 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  72
  73 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  74     EVT_CHAR(wxTextCtrl::OnChar)
  75     EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  76
  77     EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
  78     EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
  79     EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
  80     EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
  81     EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)
  82
  83     EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
  84     EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
  85     EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
  86     EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
  87     EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)
  88 END_EVENT_TABLE()
  89
  90 #endif // USE_SHARED_LIBRARY
  91
  92 // ============================================================================
  93 // implementation
  94 // ============================================================================
  95
  96 // ----------------------------------------------------------------------------
  97 // creation
  98 // ----------------------------------------------------------------------------
  99
 100 wxTextCtrl::wxTextCtrl()
 101 {
 102 #if wxUSE_RICHEDIT
 103     m_isRich = FALSE;
 104 #endif
 105 }
 106
 107 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
 108                         const wxString& value,
 109                         const wxPoint& pos,
 110                         const wxSize& size,
 111                         long style,
 112                         const wxValidator& validator,
 113                         const wxString& name)
 114 {
 115     // base initialization
 116     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
 117         return FALSE;
 118
 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                       wxT("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 = wxT("EDIT");
 170
 171 #if wxUSE_RICHEDIT
 172     if ( m_windowStyle & wxTE_RICH )
 173     {
 174         static bool s_errorGiven = FALSE;   // MT-FIXME
 175
 176         // only give the error msg once if the DLL can't be loaded
 177         if ( !s_errorGiven )
 178         {
 179             // first try to load the RichEdit DLL (will do nothing if already
 180             // done)
 181             if ( !wxTheApp->InitRichEdit() )
 182             {
 183                 wxLogError(_("Impossible to create a rich edit control, "
 184                              "using simple text control instead."));
 185
 186                 s_errorGiven = TRUE;
 187             }
 188         }
 189
 190         if ( s_errorGiven )
 191         {
 192             m_isRich = FALSE;
 193         }
 194         else
 195         {
 196             msStyle |= ES_AUTOVSCROLL;
 197             m_isRich = TRUE;
 198             windowClass = wxT("RICHEDIT");
 199         }
 200     }
 201     else
 202         m_isRich = FALSE;
 203 #endif
 204
 205     bool want3D;
 206     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 207
 208     // Even with extended styles, need to combine with WS_BORDER for them to
 209     // look right.
 210     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 211         msStyle |= WS_BORDER;
 212
 213     // NB: don't use pos and size as CreateWindowEx arguments because they
 214     //     might be -1 in which case we should use the default values (and
 215     //     SetSize called below takes care of it)
 216     m_hWnd = (WXHWND)::CreateWindowEx(exStyle,
 217                                       windowClass,
 218                                       NULL,
 219                                       msStyle,
 220                                       0, 0, 0, 0,
 221                                       GetHwndOf(parent),
 222                                       (HMENU)m_windowId,
 223                                       wxGetInstance(),
 224                                       NULL);
 225
 226     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create text ctrl") );
 227
 228 #if wxUSE_CTL3D
 229     if ( want3D )
 230     {
 231         Ctl3dSubclassCtl(GetHwnd());
 232         m_useCtl3D = TRUE;
 233     }
 234 #endif
 235
 236 #if wxUSE_RICHEDIT
 237     if (m_isRich)
 238     {
 239         // Have to enable events
 240         ::SendMessage(GetHwnd(), EM_SETEVENTMASK, 0,
 241                       ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 242     }
 243 #endif
 244
 245     SubclassWin(GetHWND());
 246
 247     // set font, position, size and initial value
 248     wxFont& fontParent = parent->GetFont();
 249     if ( fontParent.Ok() )
 250     {
 251         SetFont(fontParent);
 252     }
 253     else
 254     {
 255         SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 256     }
 257
 258     // Causes a crash for Symantec C++ and WIN32 for some reason
 259 #if !(defined(__SC__) && defined(__WIN32__))
 260     if ( !value.IsEmpty() )
 261     {
 262         SetValue(value);
 263     }
 264 #endif
 265
 266     SetSize(pos.x, pos.y, size.x, size.y);
 267
 268     return TRUE;
 269 }
 270
 271 // Make sure the window style (etc.) reflects the HWND style (roughly)
 272 void wxTextCtrl::AdoptAttributesFromHWND()
 273 {
 274   wxWindow::AdoptAttributesFromHWND();
 275
 276   HWND hWnd = GetHwnd();
 277   long style = GetWindowLong(hWnd, GWL_STYLE);
 278
 279   // retrieve the style to see whether this is an edit or richedit ctrl
 280 #if wxUSE_RICHEDIT
 281   wxChar buf[256];
 282
 283   GetClassName(hWnd, buf, WXSIZEOF(buf));
 284
 285   if ( wxStricmp(buf, wxT("EDIT")) == 0 )
 286     m_isRich = FALSE;
 287   else
 288     m_isRich = TRUE;
 289 #endif // wxUSE_RICHEDIT
 290
 291   if (style & ES_MULTILINE)
 292     m_windowStyle |= wxTE_MULTILINE;
 293   if (style & ES_PASSWORD)
 294     m_windowStyle |= wxTE_PASSWORD;
 295   if (style & ES_READONLY)
 296     m_windowStyle |= wxTE_READONLY;
 297   if (style & ES_WANTRETURN)
 298     m_windowStyle |= wxTE_PROCESS_ENTER;
 299 }
 300
 301 void wxTextCtrl::SetupColours()
 302 {
 303     // FIXME why is bg colour not inherited from parent?
 304     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 305     SetForegroundColour(GetParent()->GetForegroundColour());
 306 }
 307
 308 // ----------------------------------------------------------------------------
 309 // set/get the controls text
 310 // ----------------------------------------------------------------------------
 311
 312 wxString wxTextCtrl::GetValue() const
 313 {
 314     return wxGetWindowText(GetHWND());
 315 }
 316
 317 void wxTextCtrl::SetValue(const wxString& value)
 318 {
 319     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 320
 321     if ( valueDos != GetValue() )
 322     {
 323         SetWindowText(GetHwnd(), valueDos);
 324
 325         AdjustSpaceLimit();
 326     }
 327 }
 328
 329 void wxTextCtrl::WriteText(const wxString& value)
 330 {
 331     wxString valueDos = wxTextFile::Translate(value, wxTextFileType_Dos);
 332
 333     SendMessage(GetHwnd(), EM_REPLACESEL, 0, (LPARAM)valueDos.c_str());
 334
 335     AdjustSpaceLimit();
 336 }
 337
 338 void wxTextCtrl::AppendText(const wxString& text)
 339 {
 340     SetInsertionPointEnd();
 341     WriteText(text);
 342 }
 343
 344 void wxTextCtrl::Clear()
 345 {
 346     SetWindowText(GetHwnd(), wxT(""));
 347 }
 348
 349 // ----------------------------------------------------------------------------
 350 // Clipboard operations
 351 // ----------------------------------------------------------------------------
 352
 353 void wxTextCtrl::Copy()
 354 {
 355     if (CanCopy())
 356     {
 357         HWND hWnd = GetHwnd();
 358         SendMessage(hWnd, WM_COPY, 0, 0L);
 359     }
 360 }
 361
 362 void wxTextCtrl::Cut()
 363 {
 364     if (CanCut())
 365     {
 366         HWND hWnd = GetHwnd();
 367         SendMessage(hWnd, WM_CUT, 0, 0L);
 368     }
 369 }
 370
 371 void wxTextCtrl::Paste()
 372 {
 373     if (CanPaste())
 374     {
 375         HWND hWnd = GetHwnd();
 376         SendMessage(hWnd, WM_PASTE, 0, 0L);
 377     }
 378 }
 379
 380 bool wxTextCtrl::CanCopy() const
 381 {
 382     // Can copy if there's a selection
 383     long from, to;
 384     GetSelection(& from, & to);
 385     return (from != to);
 386 }
 387
 388 bool wxTextCtrl::CanCut() const
 389 {
 390     // Can cut if there's a selection
 391     long from, to;
 392     GetSelection(& from, & to);
 393     return (from != to);
 394 }
 395
 396 bool wxTextCtrl::CanPaste() const
 397 {
 398 #if wxUSE_RICHEDIT
 399     if (m_isRich)
 400     {
 401         int dataFormat = 0; // 0 == any format
 402         return (::SendMessage( GetHwnd(), EM_CANPASTE, (WPARAM) (UINT) dataFormat, 0) != 0);
 403     }
 404 #endif
 405     if (!IsEditable())
 406         return FALSE;
 407
 408     // Standard edit control: check for straight text on clipboard
 409     bool isTextAvailable = FALSE;
 410     if ( ::OpenClipboard(GetHwndOf(wxTheApp->GetTopWindow())) )
 411     {
 412         isTextAvailable = (::IsClipboardFormatAvailable(CF_TEXT) != 0);
 413         ::CloseClipboard();
 414     }
 415
 416     return isTextAvailable;
 417 }
 418
 419 // ----------------------------------------------------------------------------
 420 // Accessors
 421 // ----------------------------------------------------------------------------
 422
 423 void wxTextCtrl::SetEditable(bool editable)
 424 {
 425     HWND hWnd = GetHwnd();
 426     SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 427 }
 428
 429 void wxTextCtrl::SetInsertionPoint(long pos)
 430 {
 431     HWND hWnd = GetHwnd();
 432 #ifdef __WIN32__
 433 #if wxUSE_RICHEDIT
 434     if ( m_isRich)
 435     {
 436         CHARRANGE range;
 437         range.cpMin = pos;
 438         range.cpMax = pos;
 439         SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 440         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 441     }
 442     else
 443 #endif // wxUSE_RICHEDIT
 444     {
 445         SendMessage(hWnd, EM_SETSEL, pos, pos);
 446         SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 447     }
 448 #else // Win16
 449     SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 450 #endif // Win32/16
 451
 452     static const char *nothing = "";
 453     SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 454 }
 455
 456 void wxTextCtrl::SetInsertionPointEnd()
 457 {
 458     long pos = GetLastPosition();
 459     SetInsertionPoint(pos);
 460 }
 461
 462 long wxTextCtrl::GetInsertionPoint() const
 463 {
 464 #if wxUSE_RICHEDIT
 465     if (m_isRich)
 466     {
 467         CHARRANGE range;
 468         range.cpMin = 0;
 469         range.cpMax = 0;
 470         SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) &range);
 471         return range.cpMin;
 472     }
 473 #endif
 474
 475     DWORD Pos = (DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 476     return Pos & 0xFFFF;
 477 }
 478
 479 long wxTextCtrl::GetLastPosition() const
 480 {
 481     HWND hWnd = GetHwnd();
 482
 483     // Will always return a number > 0 (according to docs)
 484     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 485
 486     // This gets the char index for the _beginning_ of the last line
 487     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 488
 489     // Get number of characters in the last line. We'll add this to the character
 490     // index for the last line, 1st position.
 491     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 492
 493     return (long)(charIndex + lineLength);
 494 }
 495
 496 // If the return values from and to are the same, there is no
 497 // selection.
 498 void wxTextCtrl::GetSelection(long* from, long* to) const
 499 {
 500 #if wxUSE_RICHEDIT
 501     if (m_isRich)
 502     {
 503         CHARRANGE charRange;
 504         ::SendMessage(GetHwnd(), EM_EXGETSEL, 0, (LPARAM) (CHARRANGE*) & charRange);
 505
 506         *from = charRange.cpMin;
 507         *to = charRange.cpMax;
 508
 509         return;
 510     }
 511 #endif
 512     DWORD dwStart, dwEnd;
 513     WPARAM wParam = (WPARAM) (DWORD*) & dwStart; // receives starting position
 514     LPARAM lParam = (LPARAM) (DWORD*) & dwEnd;   // receives ending position
 515
 516     ::SendMessage(GetHwnd(), EM_GETSEL, wParam, lParam);
 517
 518     *from = dwStart;
 519     *to = dwEnd;
 520 }
 521
 522 bool wxTextCtrl::IsEditable() const
 523 {
 524     long style = ::GetWindowLong(GetHwnd(), GWL_STYLE);
 525
 526     return ((style & ES_READONLY) == 0);
 527 }
 528
 529 // ----------------------------------------------------------------------------
 530 // Editing
 531 // ----------------------------------------------------------------------------
 532
 533 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 534 {
 535 #if wxUSE_CLIPBOARD
 536     HWND hWnd = GetHwnd();
 537     long fromChar = from;
 538     long toChar = to;
 539
 540     // Set selection and remove it
 541 #ifdef __WIN32__
 542     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 543 #else
 544     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 545 #endif
 546     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 547
 548     // Now replace with 'value', by pasting.
 549     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const wxChar *)value, 0, 0);
 550
 551     // Paste into edit control
 552     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 553 #else
 554     wxFAIL_MSG("wxTextCtrl::Replace not implemented if wxUSE_CLIPBOARD is 0.");
 555 #endif
 556 }
 557
 558 void wxTextCtrl::Remove(long from, long to)
 559 {
 560     HWND hWnd = GetHwnd();
 561     long fromChar = from;
 562     long toChar = to;
 563
 564     // Cut all selected text
 565 #ifdef __WIN32__
 566     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 567 #else
 568     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 569 #endif
 570     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 571 }
 572
 573 void wxTextCtrl::SetSelection(long from, long to)
 574 {
 575     HWND hWnd = GetHwnd();
 576     long fromChar = from;
 577     long toChar = to;
 578
 579     // if from and to are both -1, it means (in wxWindows) that all text should
 580     // be selected. Translate into Windows convention
 581     if ((from == -1) && (to == -1))
 582     {
 583       fromChar = 0;
 584       toChar = -1;
 585     }
 586
 587 #ifdef __WIN32__
 588     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 589     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 590 #else
 591     // WPARAM is 0: selection is scrolled into view
 592     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 593 #endif
 594 }
 595
 596 bool wxTextCtrl::LoadFile(const wxString& file)
 597 {
 598     if ( wxTextCtrlBase::LoadFile(file) )
 599     {
 600         // update the size limit if needed
 601         AdjustSpaceLimit();
 602
 603         return TRUE;
 604     }
 605
 606     return FALSE;
 607 }
 608
 609 bool wxTextCtrl::IsModified() const
 610 {
 611     return (SendMessage(GetHwnd(), EM_GETMODIFY, 0, 0) != 0);
 612 }
 613
 614 // Makes 'unmodified'
 615 void wxTextCtrl::DiscardEdits()
 616 {
 617     SendMessage(GetHwnd(), EM_SETMODIFY, FALSE, 0L);
 618 }
 619
 620 int wxTextCtrl::GetNumberOfLines() const
 621 {
 622     return (int)SendMessage(GetHwnd(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 623 }
 624
 625 long wxTextCtrl::XYToPosition(long x, long y) const
 626 {
 627     HWND hWnd = GetHwnd();
 628
 629     // This gets the char index for the _beginning_ of this line
 630     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 631     return (long)(x + charIndex);
 632 }
 633
 634 bool wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 635 {
 636     HWND hWnd = GetHwnd();
 637
 638     // This gets the line number containing the character
 639     int lineNo;
 640 #if wxUSE_RICHEDIT
 641     if ( m_isRich )
 642     {
 643         lineNo = (int)SendMessage(hWnd, EM_EXLINEFROMCHAR, 0, (LPARAM)pos);
 644     }
 645     else
 646 #endif // wxUSE_RICHEDIT
 647         lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, 0);
 648
 649     if ( lineNo == -1 )
 650     {
 651         // no such line
 652         return FALSE;
 653     }
 654
 655     // This gets the char index for the _beginning_ of this line
 656     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 657     if ( charIndex == -1 )
 658     {
 659         return FALSE;
 660     }
 661
 662     // The X position must therefore be the different between pos and charIndex
 663     if ( x )
 664         *x = (long)(pos - charIndex);
 665     if ( y )
 666         *y = (long)lineNo;
 667
 668     return TRUE;
 669 }
 670
 671 void wxTextCtrl::ShowPosition(long pos)
 672 {
 673     HWND hWnd = GetHwnd();
 674
 675     // To scroll to a position, we pass the number of lines and characters
 676     // to scroll *by*. This means that we need to:
 677     // (1) Find the line position of the current line.
 678     // (2) Find the line position of pos.
 679     // (3) Scroll by (pos - current).
 680     // For now, ignore the horizontal scrolling.
 681
 682     // Is this where scrolling is relative to - the line containing the caret?
 683     // Or is the first visible line??? Try first visible line.
 684 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 685
 686     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 687
 688     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 689
 690     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 691
 692     if (linesToScroll != 0)
 693       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)linesToScroll);
 694 }
 695
 696 int wxTextCtrl::GetLineLength(long lineNo) const
 697 {
 698     long charIndex = XYToPosition(0, lineNo);
 699     int len = (int)SendMessage(GetHwnd(), EM_LINELENGTH, charIndex, 0);
 700     return len;
 701 }
 702
 703 wxString wxTextCtrl::GetLineText(long lineNo) const
 704 {
 705     size_t len = (size_t)GetLineLength(lineNo) + 1;
 706     char *buf = (char *)malloc(len);
 707     *(WORD *)buf = len;
 708     int noChars = (int)SendMessage(GetHwnd(), EM_GETLINE, lineNo, (LPARAM)buf);
 709     buf[noChars] = 0;
 710
 711     wxString str(buf);
 712
 713     free(buf);
 714
 715     return str;
 716 }
 717
 718 // ----------------------------------------------------------------------------
 719 // Undo/redo
 720 // ----------------------------------------------------------------------------
 721
 722 void wxTextCtrl::Undo()
 723 {
 724     if (CanUndo())
 725     {
 726         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 727     }
 728 }
 729
 730 void wxTextCtrl::Redo()
 731 {
 732     if (CanRedo())
 733     {
 734         // Same as Undo, since Undo undoes the undo, i.e. a redo.
 735         ::SendMessage(GetHwnd(), EM_UNDO, 0, 0);
 736     }
 737 }
 738
 739 bool wxTextCtrl::CanUndo() const
 740 {
 741     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 742 }
 743
 744 bool wxTextCtrl::CanRedo() const
 745 {
 746     return (::SendMessage(GetHwnd(), EM_CANUNDO, 0, 0) != 0);
 747 }
 748
 749 // ----------------------------------------------------------------------------
 750 // implemenation details
 751 // ----------------------------------------------------------------------------
 752
 753 void wxTextCtrl::Command(wxCommandEvent & event)
 754 {
 755     SetValue(event.GetString());
 756     ProcessCommand (event);
 757 }
 758
 759 void wxTextCtrl::OnDropFiles(wxDropFilesEvent& event)
 760 {
 761     // By default, load the first file into the text window.
 762     if (event.GetNumberOfFiles() > 0)
 763     {
 764         LoadFile(event.GetFiles()[0]);
 765     }
 766 }
 767
 768 void wxTextCtrl::OnChar(wxKeyEvent& event)
 769 {
 770     switch ( event.KeyCode() )
 771     {
 772         case WXK_RETURN:
 773             if ( !(m_windowStyle & wxTE_MULTILINE) )
 774             {
 775                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 776                 event.SetEventObject( this );
 777                 if ( GetEventHandler()->ProcessEvent(event) )
 778                     return;
 779             }
 780             //else: multiline controls need Enter for themselves
 781
 782             break;
 783
 784         case WXK_TAB:
 785             // always produce navigation event - even if we process TAB
 786             // ourselves the fact that we got here means that the user code
 787             // decided to skip processing of this TAB - probably to let it
 788             // do its default job.
 789             //
 790             // NB: Notice that Ctrl-Tab is handled elsewhere and Alt-Tab is
 791             //     handled by Windows
 792             {
 793                 wxNavigationKeyEvent eventNav;
 794                 eventNav.SetDirection(!event.ShiftDown());
 795                 eventNav.SetWindowChange(FALSE);
 796                 eventNav.SetEventObject(this);
 797
 798                 if ( GetEventHandler()->ProcessEvent(eventNav) )
 799                     return;
 800             }
 801             break;
 802
 803         default:
 804             event.Skip();
 805             return;
 806     }
 807
 808     // don't just call event.Skip() because this will cause TABs and ENTERs
 809     // be passed upwards and we don't always want this - instead process it
 810     // right here
 811
 812     // FIXME
 813     event.Skip();
 814 }
 815
 816 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 817 {
 818     switch (param)
 819     {
 820         case EN_SETFOCUS:
 821         case EN_KILLFOCUS:
 822             {
 823                 wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
 824                         : wxEVT_SET_FOCUS,
 825                         m_windowId);
 826                 event.SetEventObject( this );
 827                 GetEventHandler()->ProcessEvent(event);
 828             }
 829             break;
 830
 831         case EN_CHANGE:
 832             {
 833                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
 834                 wxString val(GetValue());
 835                 if ( !val.IsNull() )
 836                     event.m_commandString = WXSTRINGCAST val;
 837                 event.SetEventObject( this );
 838                 ProcessCommand(event);
 839             }
 840             break;
 841
 842         case EN_ERRSPACE:
 843             // the text size limit has been hit - increase it
 844             AdjustSpaceLimit();
 845             break;
 846
 847             // the other notification messages are not processed
 848         case EN_UPDATE:
 849         case EN_MAXTEXT:
 850         case EN_HSCROLL:
 851         case EN_VSCROLL:
 852         default:
 853             return FALSE;
 854     }
 855
 856     // processed
 857     return TRUE;
 858 }
 859
 860 void wxTextCtrl::AdjustSpaceLimit()
 861 {
 862 #ifndef __WIN16__
 863     unsigned int len = ::GetWindowTextLength(GetHwnd()),
 864     limit = ::SendMessage(GetHwnd(), EM_GETLIMITTEXT, 0, 0);
 865     if ( len > limit )
 866     {
 867         limit = len + 0x8000;    // 32Kb
 868
 869 #if wxUSE_RICHEDIT
 870         if ( m_isRich || limit > 0xffff )
 871 #else
 872         if ( limit > 0xffff )
 873 #endif
 874             ::SendMessage(GetHwnd(), EM_LIMITTEXT, 0, limit);
 875         else
 876             ::SendMessage(GetHwnd(), EM_LIMITTEXT, limit, 0);
 877     }
 878 #endif
 879 }
 880
 881 bool wxTextCtrl::AcceptsFocus() const
 882 {
 883     // we don't want focus if we can't be edited
 884     return IsEditable() && wxControl::AcceptsFocus();
 885 }
 886
 887 wxSize wxTextCtrl::DoGetBestSize() const
 888 {
 889     int cx, cy;
 890     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 891
 892     int wText = DEFAULT_ITEM_WIDTH;
 893
 894     int hText = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 895     if ( m_windowStyle & wxTE_MULTILINE )
 896     {
 897         hText *= wxMin(GetNumberOfLines(), 5);
 898     }
 899     //else: for single line control everything is ok
 900
 901     return wxSize(wText, hText);
 902 }
 903
 904 // ----------------------------------------------------------------------------
 905 // standard handlers for standard edit menu events
 906 // ----------------------------------------------------------------------------
 907
 908 void wxTextCtrl::OnCut(wxCommandEvent& event)
 909 {
 910     Cut();
 911 }
 912
 913 void wxTextCtrl::OnCopy(wxCommandEvent& event)
 914 {
 915     Copy();
 916 }
 917
 918 void wxTextCtrl::OnPaste(wxCommandEvent& event)
 919 {
 920     Paste();
 921 }
 922
 923 void wxTextCtrl::OnUndo(wxCommandEvent& event)
 924 {
 925     Undo();
 926 }
 927
 928 void wxTextCtrl::OnRedo(wxCommandEvent& event)
 929 {
 930     Redo();
 931 }
 932
 933 void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
 934 {
 935     event.Enable( CanCut() );
 936 }
 937
 938 void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
 939 {
 940     event.Enable( CanCopy() );
 941 }
 942
 943 void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
 944 {
 945     event.Enable( CanPaste() );
 946 }
 947
 948 void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
 949 {
 950     event.Enable( CanUndo() );
 951 }
 952
 953 void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
 954 {
 955     event.Enable( CanRedo() );
 956 }
 957