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 #ifdef __GNUG__
  13 #pragma implementation "textctrl.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include "wx/textctrl.h"
  25 #include "wx/settings.h"
  26 #include "wx/brush.h"
  27 #include "wx/utils.h"
  28 #include "wx/log.h"
  29 #endif
  30
  31 #if wxUSE_CLIPBOARD
  32 #include "wx/app.h"
  33 #include "wx/clipbrd.h"
  34 #endif
  35
  36 #include "wx/msw/private.h"
  37
  38 #include <windows.h>
  39 #include <stdlib.h>
  40
  41 #if wxUSE_IOSTREAMH
  42 #include <fstream.h>
  43 #else
  44 #include <fstream>
  45 #  ifdef _MSC_VER
  46       using namespace std;
  47 #  endif
  48 #endif
  49
  50 #include <sys/types.h>
  51 #ifndef __MWERKS__
  52 #include <sys/stat.h>
  53 #else
  54 #include <stat.h>
  55 #endif
  56 #if defined(__BORLANDC__) && !defined(__WIN32__)
  57 #include <alloc.h>
  58 #else
  59 #ifndef __GNUWIN32__
  60 #include <malloc.h>
  61 #endif
  62 #define farmalloc malloc
  63 #define farfree free
  64 #endif
  65 #include <windowsx.h>
  66
  67 #include <string.h>
  68
  69 #if defined(__WIN95__) && !defined(__GNUWIN32__)
  70 #include <richedit.h>
  71 #endif
  72
  73 #if !USE_SHARED_LIBRARY
  74 IMPLEMENT_DYNAMIC_CLASS(wxTextCtrl, wxControl)
  75
  76 BEGIN_EVENT_TABLE(wxTextCtrl, wxControl)
  77   EVT_CHAR(wxTextCtrl::OnChar)
  78   EVT_DROP_FILES(wxTextCtrl::OnDropFiles)
  79   EVT_ERASE_BACKGROUND(wxTextCtrl::OnEraseBackground)
  80 END_EVENT_TABLE()
  81
  82 #endif
  83
  84 // Text item
  85 wxTextCtrl::wxTextCtrl(void)
  86 #ifndef NO_TEXT_WINDOW_STREAM
  87  :streambuf()
  88 #endif
  89 {
  90   m_fileName = "";
  91   m_isRich = FALSE;
  92 }
  93
  94 bool wxTextCtrl::Create(wxWindow *parent, wxWindowID id,
  95                         const wxString& value,
  96                         const wxPoint& pos,
  97                         const wxSize& size, long style,
  98                         const wxValidator& validator,
  99                         const wxString& name)
 100 {
 101   m_fileName = "";
 102   SetName(name);
 103   SetValidator(validator);
 104   if (parent) parent->AddChild(this);
 105
 106   m_windowStyle = style;
 107
 108   // Should this be taken from the system colours?
 109 //  SetBackgroundColour(wxColour(255, 255, 255));
 110
 111   SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 112
 113   SetForegroundColour(parent->GetForegroundColour()) ;
 114
 115   if ( id == -1 )
 116     m_windowId = (int)NewControlId();
 117   else
 118   m_windowId = id;
 119
 120   int x = pos.x;
 121   int y = pos.y;
 122   int width = size.x;
 123   int height = size.y;
 124
 125 #ifdef __WIN32__
 126   WXHGLOBAL m_globalHandle = 0;
 127 #else
 128   // Obscure method from the MS Developer's Network Disk for
 129   // using global memory instead of the local heap, which
 130   // runs out far too soon. Solves the problem with
 131   // failing to appear.
 132
 133   // Doesn't seem to work for Win95, so removing.
 134   m_globalHandle=0;
 135 //  if ((wxGetOsVersion() != wxWINDOWS_NT) && (wxGetOsVersion() != wxWIN95))
 136 //    m_globalHandle = (WXHGLOBAL) GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT,
 137 //                         256L);
 138 #endif
 139
 140   long msStyle = ES_LEFT | WS_VISIBLE | WS_CHILD | WS_TABSTOP;
 141   if (m_windowStyle & wxTE_MULTILINE)
 142   msStyle |= ES_MULTILINE | ES_WANTRETURN | WS_VSCROLL ; // WS_BORDER
 143   else
 144     msStyle |= ES_AUTOHSCROLL ;
 145
 146   if (m_windowStyle & wxTE_READONLY)
 147     msStyle |= ES_READONLY;
 148
 149   if (m_windowStyle & wxHSCROLL)
 150     msStyle |= (WS_HSCROLL | ES_AUTOHSCROLL) ;
 151   if (m_windowStyle & wxTE_PASSWORD) // hidden input
 152     msStyle |= ES_PASSWORD;
 153
 154   char *windowClass = "EDIT";
 155 #if defined(__WIN95__)
 156   if ( m_windowStyle & wxTE_MULTILINE )
 157   {
 158     msStyle |= ES_AUTOVSCROLL;
 159     m_isRich = TRUE;
 160     windowClass = "RichEdit" ;
 161   }
 162   else
 163 #endif
 164     m_isRich = FALSE;
 165
 166   bool want3D;
 167   WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
 168
 169   // If we're in Win95, and we want a simple 2D border,
 170   // then make it an EDIT control instead.
 171 #if defined(__WIN95__)
 172   if (m_windowStyle & wxSIMPLE_BORDER)
 173   {
 174     windowClass = "EDIT";
 175   m_isRich = FALSE;
 176   }
 177 #endif
 178
 179   // Even with extended styles, need to combine with WS_BORDER
 180   // for them to look right.
 181   if ( want3D || wxStyleHasBorder(m_windowStyle) )
 182     msStyle |= WS_BORDER;
 183
 184   m_hWnd = (WXHWND)::CreateWindowEx(exStyle, windowClass, NULL,
 185                         msStyle,
 186                         0, 0, 0, 0, (HWND) ((wxWindow*)parent)->GetHWND(), (HMENU)m_windowId,
 187                         m_globalHandle ? (HINSTANCE) m_globalHandle : wxGetInstance(), NULL);
 188
 189   wxCHECK_MSG( m_hWnd, FALSE, "Failed to create text ctrl" );
 190
 191 #if CTL3D
 192   if ( want3D )
 193   {
 194     Ctl3dSubclassCtl((HWND)m_hWnd);
 195     m_useCtl3D = TRUE;
 196   }
 197 #endif
 198
 199 #if defined(__WIN95__)
 200   if (m_isRich)
 201   {
 202     // Have to enable events
 203     ::SendMessage((HWND)m_hWnd, EM_SETEVENTMASK, 0,
 204                   ENM_CHANGE | ENM_DROPFILES | ENM_SELCHANGE | ENM_UPDATE);
 205   }
 206 #endif
 207
 208   SubclassWin(GetHWND());
 209
 210   if ( parent->GetFont().Ok() && parent->GetFont().Ok() )
 211   {
 212     SetFont(parent->GetFont());
 213   }
 214   else
 215   {
 216     SetFont(wxSystemSettings::GetSystemFont(wxSYS_SYSTEM_FONT));
 217   }
 218
 219   SetSize(x, y, width, height);
 220
 221   // Causes a crash for Symantec C++ and WIN32 for some reason
 222 #if !(defined(__SC__) && defined(__WIN32__))
 223   if ( !value.IsEmpty() )
 224   {
 225     SetValue(value);
 226   }
 227 #endif
 228
 229   return TRUE;
 230 }
 231
 232 // Make sure the window style (etc.) reflects the HWND style (roughly)
 233 void wxTextCtrl::AdoptAttributesFromHWND(void)
 234 {
 235   wxWindow::AdoptAttributesFromHWND();
 236
 237   HWND hWnd = (HWND) GetHWND();
 238   long style = GetWindowLong((HWND) hWnd, GWL_STYLE);
 239
 240     char buf[256];
 241
 242 #ifndef __WIN32__
 243   GetClassName((HWND) hWnd, buf, 256);
 244 #else
 245 #ifdef UNICODE
 246   GetClassNameW((HWND) hWnd, buf, 256);
 247 #else
 248   GetClassNameA((HWND) hWnd, buf, 256);
 249 #endif
 250 #endif
 251
 252   wxString str(buf);
 253   str.UpperCase();
 254
 255   if (str == "EDIT")
 256     m_isRich = FALSE;
 257   else
 258     m_isRich = TRUE;
 259
 260   if (style & ES_MULTILINE)
 261     m_windowStyle |= wxTE_MULTILINE;
 262   if (style & ES_PASSWORD)
 263     m_windowStyle |= wxTE_PASSWORD;
 264   if (style & ES_READONLY)
 265     m_windowStyle |= wxTE_READONLY;
 266   if (style & ES_WANTRETURN)
 267     m_windowStyle |= wxTE_PROCESS_ENTER;
 268 }
 269
 270 void wxTextCtrl::SetupColours(void)
 271 {
 272   SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 273   SetForegroundColour(GetParent()->GetForegroundColour());
 274 }
 275
 276 wxString wxTextCtrl::GetValue(void) const
 277 {
 278     int length = GetWindowTextLength((HWND) GetHWND());
 279     char *s = new char[length+1];
 280     GetWindowText((HWND) GetHWND(), s, length+1);
 281     wxString str(s);
 282     delete[] s;
 283   return str;
 284 }
 285
 286 void wxTextCtrl::SetValue(const wxString& value)
 287 {
 288   // If newlines are denoted by just 10, must stick 13 in front.
 289   int singletons = 0;
 290   int len = value.Length();
 291   int i;
 292   for (i = 0; i < len; i ++)
 293   {
 294     if ((i > 0) && (value[i] == 10) && (value[i-1] != 13))
 295       singletons ++;
 296   }
 297   if (singletons > 0)
 298   {
 299     char *tmp = new char[len + singletons + 1];
 300     int j = 0;
 301     for (i = 0; i < len; i ++)
 302     {
 303       if ((i > 0) && (value[i] == 10) && (value[i-1] != 13))
 304       {
 305         tmp[j] = 13;
 306         j ++;
 307       }
 308       tmp[j] = value[i];
 309       j ++;
 310     }
 311     tmp[j] = 0;
 312     SetWindowText((HWND) GetHWND(), tmp);
 313     delete[] tmp;
 314   }
 315   else
 316     SetWindowText((HWND) GetHWND(), (const char *)value);
 317 }
 318
 319 void wxTextCtrl::SetSize(int x, int y, int width, int height, int sizeFlags)
 320 {
 321   int currentX, currentY;
 322   GetPosition(&currentX, &currentY);
 323   int x1 = x;
 324   int y1 = y;
 325   int w1 = width;
 326   int h1 = height;
 327
 328   if (x == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE))
 329     x1 = currentX;
 330   if (y == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE))
 331     y1 = currentY;
 332
 333   AdjustForParentClientOrigin(x1, y1, sizeFlags);
 334
 335   int cx; // button font dimensions
 336   int cy;
 337
 338   wxGetCharSize(GetHWND(), &cx, &cy, & GetFont());
 339
 340   int control_width, control_height, control_x, control_y;
 341
 342   // If we're prepared to use the existing size, then...
 343   if (width == -1 && height == -1 && ((sizeFlags & wxSIZE_AUTO) != wxSIZE_AUTO))
 344   {
 345     GetSize(&w1, &h1);
 346   }
 347
 348   // Deal with default size (using -1 values)
 349   if (w1<=0)
 350     w1 = DEFAULT_ITEM_WIDTH;
 351
 352   control_x = x1;
 353   control_y = y1;
 354   control_width = w1;
 355   control_height = h1;
 356
 357   // Calculations may have made text size too small
 358   if (control_height <= 0)
 359     control_height = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 360
 361   if (control_width <= 0)
 362     control_width = DEFAULT_ITEM_WIDTH;
 363
 364   MoveWindow((HWND) GetHWND(), (int)control_x, (int)control_y,
 365                               (int)control_width, (int)control_height, TRUE);
 366 }
 367
 368 // Clipboard operations
 369 void wxTextCtrl::Copy(void)
 370 {
 371   HWND hWnd = (HWND) GetHWND();
 372   SendMessage(hWnd, WM_COPY, 0, 0L);
 373 }
 374
 375 void wxTextCtrl::Cut(void)
 376 {
 377   HWND hWnd = (HWND) GetHWND();
 378   SendMessage(hWnd, WM_CUT, 0, 0L);
 379 }
 380
 381 void wxTextCtrl::Paste(void)
 382 {
 383   HWND hWnd = (HWND) GetHWND();
 384   SendMessage(hWnd, WM_PASTE, 0, 0L);
 385 }
 386
 387 void wxTextCtrl::SetEditable(bool editable)
 388 {
 389   HWND hWnd = (HWND) GetHWND();
 390   SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 391 }
 392
 393 void wxTextCtrl::SetInsertionPoint(long pos)
 394 {
 395   HWND hWnd = (HWND) GetHWND();
 396 #ifdef __WIN32__
 397 #if defined(__WIN95__)
 398   if ( m_isRich)
 399   {
 400     CHARRANGE range;
 401     range.cpMin = pos;
 402     range.cpMax = pos;
 403     SendMessage(hWnd, EM_EXSETSEL, 0, (LPARAM) &range);
 404     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 405   }
 406   else
 407 #endif
 408   {
 409     SendMessage(hWnd, EM_SETSEL, pos, pos);
 410     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 411   }
 412 #else
 413   SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 414 #endif
 415   char *nothing = "";
 416   SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 417 }
 418
 419 void wxTextCtrl::SetInsertionPointEnd(void)
 420 {
 421   long pos = GetLastPosition();
 422   SetInsertionPoint(pos);
 423 }
 424
 425 long wxTextCtrl::GetInsertionPoint(void) const
 426 {
 427 #if defined(__WIN95__)
 428   if (m_isRich)
 429   {
 430     CHARRANGE range;
 431     range.cpMin = 0;
 432     range.cpMax = 0;
 433     SendMessage((HWND) GetHWND(), EM_EXGETSEL, 0, (LPARAM) &range);
 434     return range.cpMin;
 435   }
 436 #endif
 437
 438   DWORD Pos=(DWORD)SendMessage((HWND) GetHWND(), EM_GETSEL, 0, 0L);
 439   return Pos&0xFFFF;
 440 }
 441
 442 long wxTextCtrl::GetLastPosition(void) const
 443 {
 444     HWND hWnd = (HWND) GetHWND();
 445
 446     // Will always return a number > 0 (according to docs)
 447     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 448
 449     // This gets the char index for the _beginning_ of the last line
 450     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 451
 452     // Get number of characters in the last line. We'll add this to the character
 453     // index for the last line, 1st position.
 454     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 455
 456     return (long)(charIndex + lineLength);
 457 }
 458
 459 void wxTextCtrl::Replace(long from, long to, const wxString& value)
 460 {
 461     HWND hWnd = (HWND) GetHWND();
 462     long fromChar = from;
 463     long toChar = to;
 464
 465     // Set selection and remove it
 466 #ifdef __WIN32__
 467     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 468 #else
 469     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 470 #endif
 471     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 472
 473     // Now replace with 'value', by pasting.
 474     wxSetClipboardData(wxDF_TEXT, (wxObject *) (const char *)value, 0, 0);
 475
 476     // Paste into edit control
 477     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 478 }
 479
 480 void wxTextCtrl::Remove(long from, long to)
 481 {
 482     HWND hWnd = (HWND) GetHWND();
 483     long fromChar = from;
 484     long toChar = to;
 485
 486     // Cut all selected text
 487 #ifdef __WIN32__
 488     SendMessage(hWnd, EM_SETSEL, fromChar, toChar);
 489 #else
 490     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 491 #endif
 492     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 493 }
 494
 495 void wxTextCtrl::SetSelection(long from, long to)
 496 {
 497     HWND hWnd = (HWND) GetHWND();
 498     long fromChar = from;
 499     long toChar = to;
 500     // if from and to are both -1, it means
 501     // (in wxWindows) that all text should be selected.
 502     // This translates into Windows convention
 503     if ((from == -1) && (to == -1))
 504     {
 505       fromChar = 0;
 506       toChar = -1;
 507     }
 508
 509 #ifdef __WIN32__
 510     SendMessage(hWnd, EM_SETSEL, (WPARAM)fromChar, (LPARAM)toChar);
 511     SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 512 #else
 513     // WPARAM is 0: selection is scrolled into view
 514     SendMessage(hWnd, EM_SETSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 515 #endif
 516 }
 517
 518 bool wxTextCtrl::LoadFile(const wxString& file)
 519 {
 520   if (!wxFileExists(WXSTRINGCAST file))
 521     return FALSE;
 522
 523   m_fileName = file;
 524
 525   Clear();
 526
 527 //  ifstream input(WXSTRINGCAST file, ios::nocreate | ios::in);
 528   ifstream input(WXSTRINGCAST file, ios::in);
 529
 530   if (!input.bad())
 531   {
 532       // Previously a SETSEL/REPLACESEL call-pair were done to insert
 533       // line by line into the control. Apart from being very slow this
 534       // was limited to 32K of text by the external interface presenting
 535       // positions as signed shorts. Now load in one chunk...
 536       // Note use of 'farmalloc' as in Borland 3.1 'size_t' is 16-bits...
 537
 538       struct stat stat_buf;
 539       if (stat(file, &stat_buf) < 0)
 540         return FALSE;
 541 //      char *tmp_buffer = (char*)farmalloc(stat_buf.st_size+1);
 542       // This may need to be a bigger buffer than the file size suggests,
 543       // if it's a UNIX file. Give it an extra 1000 just in case.
 544       char *tmp_buffer = (char*)farmalloc((size_t)(stat_buf.st_size+1+1000));
 545       long no_lines = 0;
 546       long pos = 0;
 547       while (!input.eof() && input.peek() != EOF)
 548       {
 549         input.getline(wxBuffer, 500);
 550   int len = strlen(wxBuffer);
 551   wxBuffer[len] = 13;
 552   wxBuffer[len+1] = 10;
 553   wxBuffer[len+2] = 0;
 554   strcpy(tmp_buffer+pos, wxBuffer);
 555   pos += strlen(wxBuffer);
 556   no_lines++;
 557       }
 558
 559 //      SendMessage((HWND) GetHWND(), WM_SETTEXT, 0, (LPARAM)tmp_buffer);
 560       SetWindowText((HWND) GetHWND(), tmp_buffer);
 561       SendMessage((HWND) GetHWND(), EM_SETMODIFY, FALSE, 0L);
 562       farfree(tmp_buffer);
 563
 564       return TRUE;
 565   }
 566   return FALSE;
 567 }
 568
 569 // If file is null, try saved file name first
 570 // Returns TRUE if succeeds.
 571 bool wxTextCtrl::SaveFile(const wxString& file)
 572 {
 573   wxString theFile(file);
 574   if (theFile == "")
 575     theFile = m_fileName;
 576   if (theFile == "")
 577     return FALSE;
 578   m_fileName = theFile;
 579
 580   ofstream output((char*) (const char*) theFile);
 581   if (output.bad())
 582   return FALSE;
 583
 584     // This will only save 64K max
 585     unsigned long nbytes = SendMessage((HWND) GetHWND(), WM_GETTEXTLENGTH, 0, 0);
 586     char *tmp_buffer = (char*)farmalloc((size_t)(nbytes+1));
 587     SendMessage((HWND) GetHWND(), WM_GETTEXT, (WPARAM)(nbytes+1), (LPARAM)tmp_buffer);
 588     char *pstr = tmp_buffer;
 589
 590   // Convert \r\n to just \n
 591   while (*pstr)
 592   {
 593     if (*pstr != '\r')
 594       output << *pstr;
 595     pstr++;
 596   }
 597
 598     farfree(tmp_buffer);
 599     SendMessage((HWND) GetHWND(), EM_SETMODIFY, FALSE, 0L);
 600
 601     return TRUE;
 602 }
 603
 604 void wxTextCtrl::WriteText(const wxString& text)
 605 {
 606     // Covert \n to \r\n
 607     int len = text.Length();
 608     char *newtext = new char[(len*2)+1];
 609     int i = 0;
 610     int j = 0;
 611     while (i < len)
 612     {
 613       if (text[i] == '\n')
 614       {
 615         newtext[j] = '\r';
 616         j ++;
 617       }
 618       newtext[j] = text[i];
 619       i ++;
 620       j ++;
 621     }
 622     newtext[j] = 0;
 623     SendMessage((HWND) GetHWND(), EM_REPLACESEL, 0, (LPARAM)newtext);
 624     delete[] newtext;
 625 }
 626
 627 void wxTextCtrl::Clear(void)
 628 {
 629 //    SendMessage((HWND) GetHWND(), WM_SETTEXT, 0, (LPARAM)"");
 630     SetWindowText((HWND) GetHWND(), "");
 631 }
 632
 633 bool wxTextCtrl::IsModified(void) const
 634 {
 635     return (SendMessage((HWND) GetHWND(), EM_GETMODIFY, 0, 0) != 0);
 636 }
 637
 638 // Makes 'unmodified'
 639 void wxTextCtrl::DiscardEdits(void)
 640 {
 641   SendMessage((HWND) GetHWND(), EM_SETMODIFY, FALSE, 0L);
 642 }
 643
 644 /*
 645  * Some of the following functions are yet to be implemented
 646  *
 647  */
 648
 649 int wxTextCtrl::GetNumberOfLines(void) const
 650 {
 651     return (int)SendMessage((HWND) GetHWND(), EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0);
 652 }
 653
 654 long wxTextCtrl::XYToPosition(long x, long y) const
 655 {
 656     HWND hWnd = (HWND) GetHWND();
 657
 658     // This gets the char index for the _beginning_ of this line
 659     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)y, (LPARAM)0);
 660     return (long)(x + charIndex);
 661 }
 662
 663 void wxTextCtrl::PositionToXY(long pos, long *x, long *y) const
 664 {
 665     HWND hWnd = (HWND) GetHWND();
 666
 667     // This gets the line number containing the character
 668     int lineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0);
 669     // This gets the char index for the _beginning_ of this line
 670     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)lineNo, (LPARAM)0);
 671     // The X position must therefore be the different between pos and charIndex
 672     *x = (long)(pos - charIndex);
 673     *y = (long)lineNo;
 674 }
 675
 676 void wxTextCtrl::ShowPosition(long pos)
 677 {
 678     HWND hWnd = (HWND) GetHWND();
 679
 680     // To scroll to a position, we pass the number of lines and characters
 681     // to scroll *by*. This means that we need to:
 682     // (1) Find the line position of the current line.
 683     // (2) Find the line position of pos.
 684     // (3) Scroll by (pos - current).
 685     // For now, ignore the horizontal scrolling.
 686
 687     // Is this where scrolling is relative to - the line containing the caret?
 688     // Or is the first visible line??? Try first visible line.
 689 //    int currentLineLineNo1 = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)-1, (LPARAM)0L);
 690
 691     int currentLineLineNo = (int)SendMessage(hWnd, EM_GETFIRSTVISIBLELINE, (WPARAM)0, (LPARAM)0L);
 692
 693     int specifiedLineLineNo = (int)SendMessage(hWnd, EM_LINEFROMCHAR, (WPARAM)pos, (LPARAM)0L);
 694
 695     int linesToScroll = specifiedLineLineNo - currentLineLineNo;
 696
 697 /*
 698     wxDebugMsg("Caret line: %d; Current visible line: %d; Specified line: %d; lines to scroll: %d\n",
 699       currentLineLineNo1, currentLineLineNo, specifiedLineLineNo, linesToScroll);
 700 */
 701
 702     if (linesToScroll != 0)
 703       (void)SendMessage(hWnd, EM_LINESCROLL, (WPARAM)0, (LPARAM)MAKELPARAM(linesToScroll, 0));
 704 }
 705
 706 int wxTextCtrl::GetLineLength(long lineNo) const
 707 {
 708     long charIndex = XYToPosition(0, lineNo);
 709     HWND hWnd = (HWND) GetHWND();
 710     int len = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0);
 711     return len;
 712 }
 713
 714 wxString wxTextCtrl::GetLineText(long lineNo) const
 715 {
 716     HWND hWnd = (HWND) GetHWND();
 717     *(WORD *)wxBuffer = 512;
 718     int noChars = (int)SendMessage(hWnd, EM_GETLINE, (WPARAM)lineNo, (LPARAM)wxBuffer);
 719     wxBuffer[noChars] = 0;
 720   return wxString(wxBuffer);
 721 }
 722
 723 /*
 724  * Text item
 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 // The streambuf code was partly taken from chapter 3 by Jerry Schwarz of
 743 // AT&T's "C++ Lanuage System Release 3.0 Library Manual" - Stein Somers
 744
 745 //=========================================================================
 746 // Called then the buffer is full (gcc 2.6.3)
 747 // or when "endl" is output (Borland 4.5)
 748 //=========================================================================
 749 // Class declaration using multiple inheritance doesn't work properly for
 750 // Borland. See note in textctrl.h.
 751 #ifndef NO_TEXT_WINDOW_STREAM
 752 int wxTextCtrl::overflow(int c)
 753 {
 754   // Make sure there is a holding area
 755   // this is not needed in <iostream> usage as it automagically allocates
 756   // it, but does someone want to emulate it for safety's sake?
 757 #if wxUSE_IOSTREAMH
 758   if ( allocate()==EOF )
 759   {
 760     wxLogError("Streambuf allocation failed");
 761     return EOF;
 762   }
 763 #endif
 764
 765   // Verify that there are no characters in get area
 766   if ( gptr() && gptr() < egptr() )
 767   {
 768      wxError("Who's trespassing my get area?","Internal error");
 769      return EOF;
 770   }
 771
 772   // Reset get area
 773   setg(0,0,0);
 774
 775   // Make sure there is a put area
 776   if ( ! pptr() )
 777   {
 778 /* This doesn't seem to be fatal so comment out error message */
 779 //    wxError("Put area not opened","Internal error");
 780
 781 #if wxUSE_IOSTREAMH
 782           setp( base(), base() );
 783 #else
 784           setp( pbase(), pbase() );
 785 #endif
 786   }
 787
 788   // Determine how many characters have been inserted but no consumed
 789   int plen = pptr() - pbase();
 790
 791   // Now Jerry relies on the fact that the buffer is at least 2 chars
 792   // long, but the holding area "may be as small as 1" ???
 793   // And we need an additional \0, so let's keep this inefficient but
 794   // safe copy.
 795
 796   // If c!=EOF, it is a character that must also be comsumed
 797   int xtra = c==EOF? 0 : 1;
 798
 799   // Write temporary C-string to wxTextWindow
 800   {
 801   char *txt = new char[plen+xtra+1];
 802   memcpy(txt, pbase(), plen);
 803   txt[plen] = (char)c;     // append c
 804   txt[plen+xtra] = '\0';   // append '\0' or overwrite c
 805     // If the put area already contained \0, output will be truncated there
 806   WriteText(txt);
 807     delete[] txt;
 808   }
 809
 810   // Reset put area
 811   setp(pbase(), epptr());
 812
 813 #if defined(__WATCOMC__)
 814   return __NOT_EOF;
 815 #elif defined(zapeof)     // HP-UX (all cfront based?)
 816   return zapeof(c);
 817 #else
 818   return c!=EOF ? c : 0;  // this should make everybody happy
 819 #endif
 820
 821 /* OLD CODE
 822   int len = pptr() - pbase();
 823   char *txt = new char[len+1];
 824   strncpy(txt, pbase(), len);
 825   txt[len] = '\0';
 826   (*this) << txt;
 827   setp(pbase(), epptr());
 828   delete[] txt;
 829   return EOF;
 830 */
 831 }
 832
 833 //=========================================================================
 834 // called then "endl" is output (gcc) or then explicit sync is done (Borland)
 835 //=========================================================================
 836 int wxTextCtrl::sync(void)
 837 {
 838   // Verify that there are no characters in get area
 839   if ( gptr() && gptr() < egptr() )
 840   {
 841      wxError("Who's trespassing my get area?","Internal error");
 842      return EOF;
 843   }
 844
 845   if ( pptr() && pptr() > pbase() ) return overflow(EOF);
 846
 847   return 0;
 848 /* OLD CODE
 849   int len = pptr() - pbase();
 850   char *txt = new char[len+1];
 851   strncpy(txt, pbase(), len);
 852   txt[len] = '\0';
 853   (*this) << txt;
 854   setp(pbase(), epptr());
 855   delete[] txt;
 856   return 0;
 857 */
 858 }
 859
 860 //=========================================================================
 861 // Should not be called by a "ostream". Used by a "istream"
 862 //=========================================================================
 863 int wxTextCtrl::underflow(void)
 864 {
 865   return EOF;
 866 }
 867 #endif
 868
 869 wxTextCtrl& wxTextCtrl::operator<<(const wxString& s)
 870 {
 871   WriteText(s);
 872   return *this;
 873 }
 874
 875 wxTextCtrl& wxTextCtrl::operator<<(float f)
 876 {
 877     wxString str;
 878     str.Printf("%.2f", f);
 879     WriteText(str);
 880     return *this;
 881 }
 882
 883 wxTextCtrl& wxTextCtrl::operator<<(double d)
 884 {
 885     wxString str;
 886     str.Printf("%.2f", d);
 887     WriteText(str);
 888     return *this;
 889 }
 890
 891 wxTextCtrl& wxTextCtrl::operator<<(int i)
 892 {
 893     wxString str;
 894     str.Printf("%d", i);
 895     WriteText(str);
 896     return *this;
 897 }
 898
 899 wxTextCtrl& wxTextCtrl::operator<<(long i)
 900 {
 901     wxString str;
 902     str.Printf("%ld", i);
 903     WriteText(str);
 904     return *this;
 905 }
 906
 907 wxTextCtrl& wxTextCtrl::operator<<(const char c)
 908 {
 909     char buf[2];
 910
 911     buf[0] = c;
 912     buf[1] = 0;
 913     WriteText(buf);
 914     return *this;
 915 }
 916
 917 WXHBRUSH wxTextCtrl::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 918       WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 919 {
 920 #if CTL3D
 921   if ( m_useCtl3D )
 922   {
 923     HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 924     return (WXHBRUSH) hbrush;
 925   }
 926 #endif
 927
 928   if (GetParent()->GetTransparentBackground())
 929     SetBkMode((HDC) pDC, TRANSPARENT);
 930   else
 931     SetBkMode((HDC) pDC, OPAQUE);
 932
 933   ::SetBkColor((HDC) pDC, RGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
 934   ::SetTextColor((HDC) pDC, RGB(GetForegroundColour().Red(), GetForegroundColour().Green(), GetForegroundColour().Blue()));
 935
 936   wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 937
 938   // Note that this will be cleaned up in wxApp::OnIdle, if backgroundBrush
 939   // has a zero usage count.
 940   // NOT NOW - will be cleaned up at end of app.
 941 //  backgroundBrush->RealizeResource();
 942   return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 943 }
 944
 945 void wxTextCtrl::OnChar(wxKeyEvent& event)
 946 {
 947     // Fix by Marcel Rasche to allow Alt-Ctrl insertion of special characters
 948   switch(event.KeyCode())
 949   {
 950   case '{':
 951   case '}':
 952   case '[':
 953   case ']':
 954   case '|':
 955   case '~':
 956   case '\\':
 957    {
 958     char c=(char)event.KeyCode();
 959     *this << c;
 960    }
 961    break;
 962   }
 963   if ( (event.KeyCode() == WXK_RETURN) && (m_windowStyle & wxPROCESS_ENTER))
 964   {
 965     wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 966     event.SetEventObject( this );
 967     if ( GetEventHandler()->ProcessEvent(event) )
 968       return;
 969   }
 970   else if ( event.KeyCode() == WXK_TAB ) {
 971     wxNavigationKeyEvent event;
 972     event.SetDirection(!(::GetKeyState(VK_SHIFT) & 0x100));
 973     event.SetWindowChange(FALSE);
 974     event.SetEventObject(this);
 975
 976     if ( GetEventHandler()->ProcessEvent(event) )
 977       return;
 978   }
 979
 980   event.Skip();
 981 }
 982
 983 long wxTextCtrl::MSWGetDlgCode()
 984 {
 985   long lRc = DLGC_WANTCHARS | DLGC_WANTARROWS;
 986   if ( m_windowStyle & wxPROCESS_ENTER )
 987     lRc |= DLGC_WANTMESSAGE;
 988   else if ( m_windowStyle & wxTE_MULTILINE )
 989     lRc |= DLGC_WANTMESSAGE;
 990
 991   return lRc;
 992 }
 993
 994 void wxTextCtrl::OnEraseBackground(wxEraseEvent& event)
 995 {
 996     if ( m_windowStyle & wxTE_MULTILINE )
 997     {
 998         // No flicker - only problem is we probably can't change the background
 999         Default();
1000 /*
1001         RECT rect;
1002         ::GetClientRect((HWND) GetHWND(), &rect);
1003
1004         HBRUSH hBrush = ::CreateSolidBrush(PALETTERGB(GetBackgroundColour().Red(), GetBackgroundColour().Green(), GetBackgroundColour().Blue()));
1005         int mode = ::SetMapMode((HDC) event.GetDC()->GetHDC(), MM_TEXT);
1006
1007         ::FillRect ((HDC) event.GetDC()->GetHDC(), &rect, hBrush);
1008         ::DeleteObject(hBrush);
1009         ::SetMapMode((HDC) event.GetDC()->GetHDC(), mode);
1010 */
1011     }
1012 //        wxWindow::OnEraseBackground(event);
1013 }
1014
1015 bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
1016 {
1017 /*
1018   // Debugging
1019   wxDebugMsg("Edit control %d: ", (int)id);
1020   switch (param)
1021   {
1022     case EN_SETFOCUS:
1023       wxDebugMsg("EN_SETFOCUS\n");
1024       break;
1025     case EN_KILLFOCUS:
1026       wxDebugMsg("EN_KILLFOCUS\n");
1027       break;
1028     case EN_CHANGE:
1029       wxDebugMsg("EN_CHANGE\n");
1030       break;
1031     case EN_UPDATE:
1032       wxDebugMsg("EN_UPDATE\n");
1033       break;
1034     case EN_ERRSPACE:
1035       wxDebugMsg("EN_ERRSPACE\n");
1036       break;
1037     case EN_MAXTEXT:
1038       wxDebugMsg("EN_MAXTEXT\n");
1039       break;
1040     case EN_HSCROLL:
1041       wxDebugMsg("EN_HSCROLL\n");
1042       break;
1043     case EN_VSCROLL:
1044       wxDebugMsg("EN_VSCROLL\n");
1045       break;
1046     default:
1047       wxDebugMsg("Unknown EDIT notification\n");
1048       break;
1049   }
1050 */
1051   switch (param)
1052   {
1053     case EN_SETFOCUS:
1054     case EN_KILLFOCUS:
1055       {
1056         wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
1057                                                  : wxEVT_SET_FOCUS,
1058                            m_windowId);
1059         event.SetEventObject( this );
1060         GetEventHandler()->ProcessEvent(event);
1061       }
1062       break;
1063
1064     case EN_CHANGE:
1065       {
1066         wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, m_windowId);
1067         wxString val(GetValue());
1068         if ( !val.IsNull() )
1069           event.m_commandString = WXSTRINGCAST val;
1070         event.SetEventObject( this );
1071         ProcessCommand(event);
1072       }
1073       break;
1074
1075     // the other notification messages are not processed
1076     case EN_UPDATE:
1077     case EN_ERRSPACE:
1078     case EN_MAXTEXT:
1079     case EN_HSCROLL:
1080     case EN_VSCROLL:
1081     default:
1082       return FALSE;
1083   }
1084
1085   // processed
1086   return TRUE;
1087 }
1088
1089
1090 // For Rich Edit controls. Do we need it?
1091 #if 0
1092 #if defined(__WIN95__)
1093 bool wxTextCtrl::MSWNotify(WXWPARAM wParam, WXLPARAM lParam)
1094 {
1095   wxCommandEvent event(0, m_windowId);
1096   int eventType = 0;
1097   NMHDR *hdr1 = (NMHDR *) lParam;
1098   switch ( hdr1->code )
1099   {
1100     // Insert case code here
1101     default :
1102       return wxControl::MSWNotify(wParam, lParam);
1103       break;
1104   }
1105
1106   event.SetEventObject( this );
1107   event.SetEventType(eventType);
1108
1109   if ( !GetEventHandler()->ProcessEvent(event) )
1110     return FALSE;
1111
1112     return TRUE;
1113 }
1114 #endif
1115 #endif
1116