dlls/riched20/caret.c

   1 /*
   2  * RichEdit - Caret and selection functions.
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  * Copyright 2005 by Phil Krylov
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22
  23 #include "editor.h"
  24
  25 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  26
  27 void ME_SetCursorToStart(ME_TextEditor *editor, ME_Cursor *cursor)
  28 {
  29   cursor->para = editor_first_para( editor );
  30   cursor->run = para_first_run( cursor->para );
  31   cursor->nOffset = 0;
  32 }
  33
  34 static void ME_SetCursorToEnd(ME_TextEditor *editor, ME_Cursor *cursor, BOOL final_eop)
  35 {
  36   cursor->para = para_prev( editor_end_para( editor ) );
  37   cursor->run = para_end_run( cursor->para );
  38   cursor->nOffset = final_eop ? cursor->run->len : 0;
  39 }
  40
  41
  42 int ME_GetSelectionOfs(ME_TextEditor *editor, LONG *from, LONG *to)
  43 {
  44   *from = ME_GetCursorOfs(&editor->pCursors[0]);
  45   *to =   ME_GetCursorOfs(&editor->pCursors[1]);
  46
  47   if (*from > *to)
  48   {
  49     LONG tmp = *from;
  50     *from = *to;
  51     *to = tmp;
  52     return 1;
  53   }
  54   return 0;
  55 }
  56
  57 int ME_GetSelection(ME_TextEditor *editor, ME_Cursor **from, ME_Cursor **to)
  58 {
  59   int from_ofs = ME_GetCursorOfs( &editor->pCursors[0] );
  60   int to_ofs   = ME_GetCursorOfs( &editor->pCursors[1] );
  61   BOOL swap = (from_ofs > to_ofs);
  62
  63   if (from_ofs == to_ofs)
  64   {
  65       /* If cursor[0] is at the beginning of a run and cursor[1] at the end
  66          of the prev run then we need to swap. */
  67       if (editor->pCursors[0].nOffset < editor->pCursors[1].nOffset)
  68           swap = TRUE;
  69   }
  70
  71   if (!swap)
  72   {
  73     *from = &editor->pCursors[0];
  74     *to = &editor->pCursors[1];
  75     return 0;
  76   } else {
  77     *from = &editor->pCursors[1];
  78     *to = &editor->pCursors[0];
  79     return 1;
  80   }
  81 }
  82
  83 int ME_GetTextLength(ME_TextEditor *editor)
  84 {
  85   ME_Cursor cursor;
  86   ME_SetCursorToEnd(editor, &cursor, FALSE);
  87   return ME_GetCursorOfs(&cursor);
  88 }
  89
  90
  91 int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
  92 {
  93   int length;
  94
  95   if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
  96     return E_INVALIDARG;
  97   if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
  98     return E_INVALIDARG;
  99
 100   length = ME_GetTextLength(editor);
 101
 102   if ((editor->props & TXTBIT_MULTILINE)
 103         && (how->flags & GTL_USECRLF)
 104         && !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
 105     length += editor->nParagraphs - 1;
 106
 107   if (how->flags & GTL_NUMBYTES ||
 108       (how->flags & GTL_PRECISE &&     /* GTL_PRECISE seems to imply GTL_NUMBYTES */
 109        !(how->flags & GTL_NUMCHARS)))  /* unless GTL_NUMCHARS is given */
 110   {
 111     CPINFO cpinfo;
 112
 113     if (how->codepage == 1200)
 114       return length * 2;
 115     if (how->flags & GTL_PRECISE)
 116       FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
 117     if (GetCPInfo(how->codepage, &cpinfo))
 118       return length * cpinfo.MaxCharSize;
 119     ERR("Invalid codepage %u\n", how->codepage);
 120     return E_INVALIDARG;
 121   }
 122   return length;
 123 }
 124
 125 /******************************************************************
 126  *    set_selection_cursors
 127  *
 128  * Updates the selection cursors.
 129  *
 130  * Note that this does not invalidate either the old or the new selections.
 131  */
 132 int set_selection_cursors(ME_TextEditor *editor, int from, int to)
 133 {
 134   int selectionEnd = 0;
 135   const int len = ME_GetTextLength(editor);
 136
 137   /* all negative values are effectively the same */
 138   if (from < 0)
 139     from = -1;
 140   if (to < 0)
 141     to = -1;
 142
 143   /* select all */
 144   if (from == 0 && to == -1)
 145   {
 146     ME_SetCursorToStart(editor, &editor->pCursors[1]);
 147     ME_SetCursorToEnd(editor, &editor->pCursors[0], TRUE);
 148     return len + 1;
 149   }
 150
 151   /* if both values are equal and also out of bound, that means to */
 152   /* put the selection at the end of the text */
 153   if ((from == to) && (to < 0 || to > len))
 154   {
 155     selectionEnd = 1;
 156   }
 157   else
 158   {
 159     /* if from is negative and to is positive then selection is */
 160     /* deselected and caret moved to end of the current selection */
 161     if (from < 0)
 162     {
 163       LONG start, end;
 164       ME_GetSelectionOfs(editor, &start, &end);
 165       if (start != end)
 166       {
 167           if (end > len)
 168           {
 169               editor->pCursors[0].nOffset = 0;
 170               end --;
 171           }
 172           editor->pCursors[1] = editor->pCursors[0];
 173       }
 174       return end;
 175     }
 176
 177     /* adjust to if it's a negative value */
 178     if (to < 0)
 179       to = len + 1;
 180
 181     /* flip from and to if they are reversed */
 182     if (from>to)
 183     {
 184       int tmp = from;
 185       from = to;
 186       to = tmp;
 187     }
 188
 189     /* after fiddling with the values, we find from > len && to > len */
 190     if (from > len)
 191       selectionEnd = 1;
 192     /* special case with to too big */
 193     else if (to > len)
 194       to = len + 1;
 195   }
 196
 197   if (selectionEnd)
 198   {
 199     ME_SetCursorToEnd(editor, &editor->pCursors[0], FALSE);
 200     editor->pCursors[1] = editor->pCursors[0];
 201     return len;
 202   }
 203
 204   cursor_from_char_ofs( editor, from, &editor->pCursors[1] );
 205   editor->pCursors[0] = editor->pCursors[1];
 206   ME_MoveCursorChars(editor, &editor->pCursors[0], to - from, FALSE);
 207   /* Selection is not allowed in the middle of an end paragraph run. */
 208   if (editor->pCursors[1].run->nFlags & MERF_ENDPARA)
 209     editor->pCursors[1].nOffset = 0;
 210   if (editor->pCursors[0].run->nFlags & MERF_ENDPARA)
 211   {
 212     if (to > len)
 213       editor->pCursors[0].nOffset = editor->pCursors[0].run->len;
 214     else
 215       editor->pCursors[0].nOffset = 0;
 216   }
 217   return to;
 218 }
 219
 220
 221 void cursor_coords( ME_TextEditor *editor, ME_Cursor *cursor,
 222                     int *x, int *y, int *height )
 223 {
 224   ME_Row *row;
 225   ME_Run *run = cursor->run;
 226   ME_Paragraph *para = cursor->para;
 227   ME_Run *size_run = run, *prev;
 228   ME_Context c;
 229   int run_x;
 230   HDC hdc = ITextHost_TxGetDC( editor->texthost );
 231
 232   assert(~para->nFlags & MEPF_REWRAP);
 233
 234   row = row_from_cursor( cursor );
 235
 236   ME_InitContext( &c, editor, hdc );
 237
 238   if (!cursor->nOffset && (prev = run_prev( run ))) size_run = prev;
 239
 240   run_x = ME_PointFromCharContext( &c, run, cursor->nOffset, TRUE );
 241
 242   *height = size_run->nAscent + size_run->nDescent;
 243   *x = c.rcView.left + run->pt.x + run_x - editor->horz_si.nPos;
 244   *y = c.rcView.top + para->pt.y + row->nBaseline
 245        + run->pt.y - size_run->nAscent - editor->vert_si.nPos;
 246   ME_DestroyContext(&c);
 247   ITextHost_TxReleaseDC( editor->texthost, hdc );
 248   return;
 249 }
 250
 251 void create_caret(ME_TextEditor *editor)
 252 {
 253   int x, y, height;
 254
 255   cursor_coords( editor, &editor->pCursors[0], &x, &y, &height );
 256   ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
 257   editor->caret_height = height;
 258   editor->caret_hidden = TRUE;
 259 }
 260
 261 void show_caret(ME_TextEditor *editor)
 262 {
 263   ITextHost_TxShowCaret(editor->texthost, TRUE);
 264   editor->caret_hidden = FALSE;
 265 }
 266
 267 void hide_caret(ME_TextEditor *editor)
 268 {
 269   /* calls to HideCaret are cumulative; do so only once */
 270   if (!editor->caret_hidden)
 271   {
 272     ITextHost_TxShowCaret(editor->texthost, FALSE);
 273     editor->caret_hidden = TRUE;
 274   }
 275 }
 276
 277 void update_caret(ME_TextEditor *editor)
 278 {
 279   int x, y, height;
 280
 281   if (!editor->bHaveFocus) return;
 282   if (!ME_IsSelection(editor))
 283   {
 284     cursor_coords( editor, &editor->pCursors[0], &x, &y, &height );
 285     if (height != editor->caret_height) create_caret(editor);
 286     x = min(x, editor->rcFormat.right-1);
 287     ITextHost_TxSetCaretPos(editor->texthost, x, y);
 288     show_caret(editor);
 289   }
 290   else
 291     hide_caret(editor);
 292 }
 293
 294 BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
 295                            int nChars, BOOL bForce)
 296 {
 297   ME_Cursor c = *start;
 298   int nOfs = ME_GetCursorOfs(start), text_len = ME_GetTextLength( editor );
 299   int shift = 0;
 300   int totalChars = nChars;
 301   ME_Paragraph *start_para;
 302   BOOL delete_all = FALSE;
 303
 304   /* Prevent deletion past last end of paragraph run. */
 305   nChars = min(nChars, text_len - nOfs);
 306   if (nChars == text_len) delete_all = TRUE;
 307   start_para = c.para;
 308
 309   if (!bForce)
 310   {
 311     table_protect_partial_deletion( editor, &c, &nChars );
 312     if (nChars == 0) return FALSE;
 313   }
 314
 315   while (nChars > 0)
 316   {
 317     ME_Run *run;
 318     cursor_from_char_ofs( editor, nOfs + nChars, &c );
 319     if (!c.nOffset)
 320     {
 321       /* We aren't deleting anything in this run, so we will go back to the
 322        * last run we are deleting text in. */
 323       c.run = run_prev_all_paras( c.run );
 324       c.para = c.run->para;
 325       c.nOffset = c.run->len;
 326     }
 327     run = c.run;
 328     if (run->nFlags & MERF_ENDPARA)
 329     {
 330       int eollen = c.run->len;
 331       BOOL keepFirstParaFormat;
 332
 333       if (!para_next( para_next( c.para ) )) return TRUE;
 334
 335       keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
 336                              run->nCharOfs);
 337       if (!editor->bEmulateVersion10) /* v4.1 */
 338       {
 339         ME_Paragraph *this_para = run->para;
 340         ME_Paragraph *next_para = para_next( this_para );
 341
 342         /* The end of paragraph before a table row is only deleted if there
 343          * is nothing else on the line before it. */
 344         if (this_para == start_para && next_para->nFlags & MEPF_ROWSTART)
 345         {
 346           /* If the paragraph will be empty, then it should be deleted, however
 347            * it still might have text right now which would inherit the
 348            * MEPF_STARTROW property if we joined it right now.
 349            * Instead we will delete it after the preceding text is deleted. */
 350           if (nOfs > this_para->nCharOfs)
 351           {
 352             /* Skip this end of line. */
 353             nChars -= (eollen < nChars) ? eollen : nChars;
 354             continue;
 355           }
 356           keepFirstParaFormat = TRUE;
 357         }
 358       }
 359       para_join( editor, c.para, keepFirstParaFormat );
 360       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 361       ME_CheckCharOffsets(editor);
 362       nChars -= (eollen < nChars) ? eollen : nChars;
 363       continue;
 364     }
 365     else
 366     {
 367       ME_Cursor cursor;
 368       int nCharsToDelete = min(nChars, c.nOffset);
 369       int i;
 370
 371       c.nOffset -= nCharsToDelete;
 372
 373       para_mark_rewrap( editor, c.run->para );
 374
 375       cursor = c;
 376       /* nChars is the number of characters that should be deleted from the
 377          PRECEDING runs (these BEFORE cursor.pRun)
 378          nCharsToDelete is a number of chars to delete from THIS run */
 379       nChars -= nCharsToDelete;
 380       shift -= nCharsToDelete;
 381       TRACE("Deleting %d (remaining %d) chars at %d in %s (%d)\n",
 382         nCharsToDelete, nChars, c.nOffset,
 383         debugstr_run( run ), run->len);
 384
 385       /* nOfs is a character offset (from the start of the document
 386          to the current (deleted) run */
 387       add_undo_insert_run( editor, nOfs + nChars, get_text( run, c.nOffset ), nCharsToDelete, run->nFlags, run->style );
 388
 389       ME_StrDeleteV(run->para->text, run->nCharOfs + c.nOffset, nCharsToDelete);
 390       run->len -= nCharsToDelete;
 391       TRACE("Post deletion string: %s (%d)\n", debugstr_run( run ), run->len);
 392       TRACE("Shift value: %d\n", shift);
 393
 394       /* update cursors (including c) */
 395       for (i=-1; i<editor->nCursors; i++) {
 396         ME_Cursor *pThisCur = editor->pCursors + i;
 397         if (i == -1) pThisCur = &c;
 398         if (pThisCur->run == cursor.run) {
 399           if (pThisCur->nOffset > cursor.nOffset) {
 400             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 401               pThisCur->nOffset = cursor.nOffset;
 402             else
 403               pThisCur->nOffset -= nCharsToDelete;
 404             assert(pThisCur->nOffset >= 0);
 405             assert(pThisCur->nOffset <= run->len);
 406           }
 407           if (pThisCur->nOffset == run->len)
 408           {
 409             pThisCur->run = run_next( pThisCur->run );
 410             assert( pThisCur->run );
 411             pThisCur->nOffset = 0;
 412           }
 413         }
 414       }
 415
 416       /* c = updated data now */
 417
 418       if (c.run == cursor.run) c.run->nCharOfs -= shift;
 419       editor_propagate_char_ofs( NULL, c.run, shift );
 420
 421       if (!cursor.run->len)
 422       {
 423         TRACE("Removing empty run\n");
 424         ME_Remove( run_get_di( cursor.run ));
 425         ME_DestroyDisplayItem( run_get_di( cursor.run ));
 426       }
 427
 428       shift = 0;
 429       continue;
 430     }
 431   }
 432   if (delete_all) editor_set_default_para_fmt( editor, &start_para->fmt );
 433   return TRUE;
 434 }
 435
 436 BOOL ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, int nChars)
 437 {
 438   assert(nCursor>=0 && nCursor<editor->nCursors);
 439   /* text operations set modified state */
 440   editor->nModifyStep = 1;
 441   return ME_InternalDeleteText(editor, &editor->pCursors[nCursor],
 442                                nChars, FALSE);
 443 }
 444
 445 static struct re_object* create_re_object(const REOBJECT *reo, ME_Run *run)
 446 {
 447   struct re_object *reobj = heap_alloc(sizeof(*reobj));
 448
 449   if (!reobj)
 450   {
 451     WARN("Fail to allocate re_object.\n");
 452     return NULL;
 453   }
 454   ME_CopyReObject(&reobj->obj, reo, REO_GETOBJ_ALL_INTERFACES);
 455   reobj->run = run;
 456   return reobj;
 457 }
 458
 459 void editor_insert_oleobj(ME_TextEditor *editor, const REOBJECT *reo)
 460 {
 461   ME_Run *run, *prev;
 462   const WCHAR space = ' ';
 463   struct re_object *reobj_prev = NULL;
 464   ME_Cursor *cursor, cursor_from_ofs;
 465   ME_Style *style;
 466
 467   if (reo->cp == REO_CP_SELECTION)
 468     cursor = editor->pCursors;
 469   else
 470   {
 471     cursor_from_char_ofs( editor, reo->cp, &cursor_from_ofs );
 472     cursor = &cursor_from_ofs;
 473   }
 474   style = style_get_insert_style( editor, cursor );
 475
 476   if (ME_IsSelection(editor))
 477     ME_DeleteSelection(editor);
 478
 479   run = run_insert( editor, cursor, style, &space, 1, MERF_GRAPHICS );
 480
 481   run->reobj = create_re_object( reo, run );
 482
 483   prev = run;
 484   while ((prev = run_prev_all_paras( prev )))
 485   {
 486     if (prev->reobj)
 487     {
 488       reobj_prev = prev->reobj;
 489       break;
 490     }
 491   }
 492   if (reobj_prev)
 493     list_add_after(&reobj_prev->entry, &run->reobj->entry);
 494   else
 495     list_add_head(&editor->reobj_list, &run->reobj->entry);
 496
 497   ME_ReleaseStyle( style );
 498 }
 499
 500
 501 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
 502 {
 503   const WCHAR space = ' ';
 504   ME_Cursor *cursor = editor->pCursors + nCursor;
 505   ME_Style *style = style_get_insert_style( editor, cursor );
 506
 507   /* FIXME no no no */
 508   if (ME_IsSelection(editor))
 509     ME_DeleteSelection(editor);
 510
 511   run_insert( editor, cursor, style, &space, 1, MERF_ENDROW );
 512
 513   ME_ReleaseStyle( style );
 514 }
 515
 516
 517 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 518                              const WCHAR *str, int len, ME_Style *style)
 519 {
 520   const WCHAR *pos;
 521   ME_Cursor *cursor = editor->pCursors + nCursor;
 522   int oldLen;
 523
 524   /* FIXME really HERE ? */
 525   if (ME_IsSelection(editor))
 526     ME_DeleteSelection(editor);
 527
 528   oldLen = ME_GetTextLength(editor);
 529
 530   /* text operations set modified state */
 531   editor->nModifyStep = 1;
 532
 533   assert(style);
 534
 535   if (len == -1) len = lstrlenW( str );
 536
 537   /* grow the text limit to fit our text */
 538   if (editor->nTextLimit < oldLen + len) editor->nTextLimit = oldLen + len;
 539
 540   pos = str;
 541
 542   while (len)
 543   {
 544     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 545     while (pos - str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 546       pos++;
 547
 548     if (pos != str) /* handle text */
 549       run_insert( editor, cursor, style, str, pos - str, 0 );
 550     else if (*pos == '\t') /* handle tabs */
 551     {
 552       const WCHAR tab = '\t';
 553       run_insert( editor, cursor, style, &tab, 1, MERF_TAB );
 554       pos++;
 555     }
 556     else /* handle EOLs */
 557     {
 558       ME_Run *end_run, *run, *prev;
 559       ME_Paragraph *new_para;
 560       int eol_len = 0;
 561
 562       /* Check if new line is allowed for this control */
 563       if (!(editor->props & TXTBIT_MULTILINE))
 564         break;
 565
 566       /* Find number of CR and LF in end of paragraph run */
 567       if (*pos =='\r')
 568       {
 569         if (len > 1 && pos[1] == '\n')
 570           eol_len = 2;
 571         else if (len > 2 && pos[1] == '\r' && pos[2] == '\n')
 572           eol_len = 3;
 573         else
 574           eol_len = 1;
 575       }
 576       else
 577       {
 578         assert(*pos == '\n');
 579         eol_len = 1;
 580       }
 581       pos += eol_len;
 582
 583       if (!editor->bEmulateVersion10 && eol_len == 3)
 584       {
 585         /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 586         const WCHAR space = ' ';
 587         run_insert( editor, cursor, style, &space, 1, 0 );
 588       }
 589       else
 590       {
 591         const WCHAR cr = '\r', *eol_str = str;
 592
 593         if (!editor->bEmulateVersion10)
 594         {
 595           eol_str = &cr;
 596           eol_len = 1;
 597         }
 598
 599         if (cursor->nOffset == cursor->run->len)
 600         {
 601            run = run_next( cursor->run );
 602            if (!run) run = cursor->run;
 603         }
 604         else
 605         {
 606           if (cursor->nOffset) run_split( editor, cursor );
 607           run = cursor->run;
 608         }
 609
 610         new_para = para_split( editor, run, style, eol_str, eol_len, 0 );
 611         end_run = para_end_run( para_prev( new_para ) );
 612
 613         /* Move any cursors that were at the end of the previous run to the beginning of the new para */
 614         prev = run_prev( end_run );
 615         if (prev)
 616         {
 617           int i;
 618           for (i = 0; i < editor->nCursors; i++)
 619           {
 620             if (editor->pCursors[i].run == prev &&
 621                 editor->pCursors[i].nOffset == prev->len)
 622             {
 623               editor->pCursors[i].para = new_para;
 624               editor->pCursors[i].run = run;
 625               editor->pCursors[i].nOffset = 0;
 626             }
 627           }
 628         }
 629
 630       }
 631     }
 632     len -= pos - str;
 633     str = pos;
 634   }
 635 }
 636
 637 /* Move the cursor nRelOfs characters (either forwards or backwards)
 638  * If final_eop is TRUE, allow moving the cursor to the end of the final eop.
 639  *
 640  * returns the actual number of characters moved.
 641  **/
 642 int ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs, BOOL final_eop)
 643 {
 644   cursor->nOffset += nRelOfs;
 645   if (cursor->nOffset < 0)
 646   {
 647     cursor->nOffset += cursor->run->nCharOfs;
 648     if (cursor->nOffset >= 0)
 649     {
 650       /* new offset in the same paragraph */
 651       do {
 652         cursor->run = run_prev( cursor->run );
 653       } while (cursor->nOffset < cursor->run->nCharOfs);
 654       cursor->nOffset -= cursor->run->nCharOfs;
 655       return nRelOfs;
 656     }
 657
 658     cursor->nOffset += cursor->para->nCharOfs;
 659     if (cursor->nOffset <= 0)
 660     {
 661       /* moved to the start of the text */
 662       nRelOfs -= cursor->nOffset;
 663       ME_SetCursorToStart(editor, cursor);
 664       return nRelOfs;
 665     }
 666
 667     /* new offset in a previous paragraph */
 668     do {
 669       cursor->para = para_prev( cursor->para );
 670     } while (cursor->nOffset < cursor->para->nCharOfs);
 671     cursor->nOffset -= cursor->para->nCharOfs;
 672
 673     cursor->run = para_end_run( cursor->para );
 674     while (cursor->nOffset < cursor->run->nCharOfs)
 675       cursor->run = run_prev( cursor->run );
 676     cursor->nOffset -= cursor->run->nCharOfs;
 677   }
 678   else if (cursor->nOffset >= cursor->run->len)
 679   {
 680     ME_Paragraph *next_para;
 681     int new_offset;
 682
 683     new_offset = ME_GetCursorOfs(cursor);
 684     next_para = para_next( cursor->para );
 685     if (new_offset < next_para->nCharOfs)
 686     {
 687       /* new offset in the same paragraph */
 688       do {
 689         cursor->nOffset -= cursor->run->len;
 690         cursor->run = run_next( cursor->run );
 691       } while (cursor->nOffset >= cursor->run->len);
 692       return nRelOfs;
 693     }
 694
 695     if (new_offset >= ME_GetTextLength(editor) + (final_eop ? 1 : 0))
 696     {
 697       /* new offset at the end of the text */
 698       ME_SetCursorToEnd(editor, cursor, final_eop);
 699       nRelOfs -= new_offset - (ME_GetTextLength(editor) + (final_eop ? 1 : 0));
 700       return nRelOfs;
 701     }
 702
 703     /* new offset in a following paragraph */
 704     do {
 705       cursor->para = next_para;
 706       next_para = para_next( next_para );
 707     } while (new_offset >= next_para->nCharOfs);
 708
 709     cursor->nOffset = new_offset - cursor->para->nCharOfs;
 710     cursor->run = para_first_run( cursor->para );
 711     while (cursor->nOffset >= cursor->run->len)
 712     {
 713       cursor->nOffset -= cursor->run->len;
 714       cursor->run = run_next( cursor->run );
 715     }
 716   } /* else new offset is in the same run */
 717   return nRelOfs;
 718 }
 719
 720
 721 BOOL
 722 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 723 {
 724   ME_Run *run = cursor->run, *other_run;
 725   ME_Paragraph *para = cursor->para;
 726   int nOffset = cursor->nOffset;
 727
 728   if (nRelOfs == -1)
 729   {
 730     /* Backward movement */
 731     while (TRUE)
 732     {
 733       nOffset = ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset, WB_MOVEWORDLEFT );
 734       if (nOffset) break;
 735       other_run = run_prev( run );
 736       if (other_run)
 737       {
 738         if (ME_CallWordBreakProc( editor, get_text( other_run, 0 ), other_run->len, other_run->len - 1, WB_ISDELIMITER )
 739             && !(run->nFlags & MERF_ENDPARA)
 740             && !(cursor->run == run && cursor->nOffset == 0)
 741             && !ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, 0, WB_ISDELIMITER ))
 742           break;
 743         run = other_run;
 744         nOffset = other_run->len;
 745       }
 746       else
 747       {
 748         if (cursor->run == run && cursor->nOffset == 0)
 749         {
 750           para = run->para;
 751           /* Skip empty start of table row paragraph */
 752           if (para_prev( para ) && para_prev( para )->nFlags & MEPF_ROWSTART)
 753             para = para_prev( para );
 754           /* Paragraph breaks are treated as separate words */
 755           if (!para_prev( para )) return FALSE;
 756           para = para_prev( para );
 757           run = para_end_run( para );
 758         }
 759         break;
 760       }
 761     }
 762   }
 763   else
 764   {
 765     /* Forward movement */
 766     BOOL last_delim = FALSE;
 767
 768     while (TRUE)
 769     {
 770       if (last_delim && !ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset, WB_ISDELIMITER ))
 771         break;
 772       nOffset = ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset, WB_MOVEWORDRIGHT );
 773       if (nOffset < run->len) break;
 774       other_run = run_next( run );
 775       if (other_run)
 776       {
 777         last_delim = ME_CallWordBreakProc( editor, get_text( run, 0 ), run->len, nOffset - 1, WB_ISDELIMITER );
 778         run = other_run;
 779         nOffset = 0;
 780       }
 781       else
 782       {
 783         para = para_next( para );
 784         if (!para_next( para ))
 785         {
 786           if (cursor->run == run) return FALSE;
 787           nOffset = 0;
 788           break;
 789         }
 790         if (para->nFlags & MEPF_ROWSTART) para = para_next( para );
 791         if (cursor->run == run) run = para_first_run( para );
 792         nOffset = 0;
 793         break;
 794       }
 795     }
 796   }
 797   cursor->para = para;
 798   cursor->run = run;
 799   cursor->nOffset = nOffset;
 800   return TRUE;
 801 }
 802
 803
 804 static void
 805 ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
 806 {
 807   /* pCursor[0] is the end of the selection
 808    * pCursor[1] is the start of the selection (or the position selection anchor)
 809    * pCursor[2] and [3] are the selection anchors that are backed up
 810    * so they are kept when the selection changes for drag selection.
 811    */
 812
 813   editor->nSelectionType = selectionType;
 814   switch(selectionType)
 815   {
 816     case stPosition:
 817       break;
 818     case stWord:
 819       ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
 820       editor->pCursors[1] = editor->pCursors[0];
 821       ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
 822       break;
 823     case stParagraph:
 824       editor->pCursors[1] = editor->pCursors[0];
 825
 826       editor->pCursors[0].run = para_end_run( editor->pCursors[0].para );
 827       editor->pCursors[0].para = editor->pCursors[0].run->para;
 828       editor->pCursors[0].nOffset = editor->pCursors[0].run->len;
 829
 830       editor->pCursors[1].run = para_first_run( editor->pCursors[1].para );
 831       editor->pCursors[1].nOffset = 0;
 832       break;
 833     case stLine:
 834     {
 835       ME_Row *row = row_from_cursor( editor->pCursors );
 836
 837       row_first_cursor( row, editor->pCursors + 1 );
 838       row_end_cursor( row, editor->pCursors, TRUE );
 839       break;
 840     }
 841     case stDocument:
 842       /* Select everything with cursor anchored from the start of the text */
 843       ME_SetCursorToStart(editor, &editor->pCursors[1]);
 844       ME_SetCursorToEnd(editor, &editor->pCursors[0], TRUE);
 845       break;
 846     default: assert(0);
 847   }
 848   /* Store the anchor positions for extending the selection. */
 849   editor->pCursors[2] = editor->pCursors[0];
 850   editor->pCursors[3] = editor->pCursors[1];
 851 }
 852
 853 int ME_GetCursorOfs(const ME_Cursor *cursor)
 854 {
 855     return cursor->para->nCharOfs + cursor->run->nCharOfs + cursor->nOffset;
 856 }
 857
 858 /* Helper function for cursor_from_virtual_coords() to find paragraph within tables */
 859 static ME_Paragraph *pixel_pos_in_table_row( int x, int y, ME_Paragraph *para )
 860 {
 861   ME_Cell *cell, *next_cell;
 862
 863   assert( para->nFlags & MEPF_ROWSTART );
 864   cell = table_row_first_cell( para );
 865   assert( cell );
 866
 867   /* find the cell we are in */
 868   while ((next_cell = cell_next( cell )) != NULL)
 869   {
 870     if (x < next_cell->pt.x)
 871     {
 872       para = cell_first_para( cell );
 873       /* Found the cell, but there might be multiple paragraphs in
 874        * the cell, so need to search down the cell for the paragraph. */
 875       while (cell == para_cell( para ))
 876       {
 877         if (y < para->pt.y + para->nHeight)
 878         {
 879           if (para->nFlags & MEPF_ROWSTART) return pixel_pos_in_table_row( x, y, para );
 880           else return para;
 881         }
 882         para = para_next( para );
 883       }
 884       /* Past the end of the cell, so go back to the last cell paragraph */
 885       return para_prev( para );
 886     }
 887     cell = next_cell;
 888   }
 889   /* Return table row delimiter */
 890   para = table_row_end( para );
 891   assert( para->nFlags & MEPF_ROWEND );
 892   assert( para->fmt.dwMask & PFM_TABLEROWDELIMITER );
 893   assert( para->fmt.wEffects & PFE_TABLEROWDELIMITER );
 894   return para;
 895 }
 896
 897 static BOOL row_cursor( ME_TextEditor *editor, ME_Row *row, int x,
 898                         ME_Cursor *cursor )
 899 {
 900     ME_Run *run, *last;
 901     BOOL exact = TRUE;
 902
 903     if (x < row->pt.x)
 904     {
 905         x = row->pt.x;
 906         exact = FALSE;
 907     }
 908
 909     run = row_first_run( row );
 910     assert( run );
 911     cursor->nOffset = 0;
 912     do
 913     {
 914         if (x >= run->pt.x && x < run->pt.x + run->nWidth)
 915         {
 916             cursor->nOffset = ME_CharFromPoint( editor,  x - run->pt.x, run, TRUE, TRUE );
 917             cursor->run = run;
 918             cursor->para = run->para;
 919             return exact;
 920         }
 921         last = run;
 922         run = row_next_run( row, run );
 923     } while (run);
 924
 925     run = last;
 926
 927     cursor->run = run;
 928     cursor->para = run->para;
 929     return FALSE;
 930 }
 931
 932 /* Finds the run and offset from the pixel position.
 933  *
 934  * x & y are pixel positions in virtual coordinates into the rich edit control,
 935  * so client coordinates must first be adjusted by the scroll position.
 936  *
 937  * If final_eop is TRUE consider the final end-of-paragraph.
 938  *
 939  * returns TRUE if the result was exactly under the cursor, otherwise returns
 940  * FALSE, and result is set to the closest position to the coordinates.
 941  */
 942 static BOOL cursor_from_virtual_coords( ME_TextEditor *editor, int x, int y,
 943                                         ME_Cursor *result, BOOL final_eop )
 944 {
 945   ME_Paragraph *para = editor_first_para( editor );
 946   ME_Row *row = NULL, *next_row;
 947   BOOL isExact = TRUE;
 948
 949   x -= editor->rcFormat.left;
 950   y -= editor->rcFormat.top;
 951
 952   /* find paragraph */
 953   for (; para_next( para ); para = para_next( para ))
 954   {
 955     if (y < para->pt.y + para->nHeight)
 956     {
 957       if (para->nFlags & MEPF_ROWSTART)
 958         para = pixel_pos_in_table_row( x, y, para );
 959       y -= para->pt.y;
 960       row = para_first_row( para );
 961       break;
 962     }
 963     else if (para->nFlags & MEPF_ROWSTART)
 964     {
 965       para = table_row_end( para );
 966     }
 967   }
 968   /* find row */
 969   while (row)
 970   {
 971     if (y < row->pt.y + row->nHeight) break;
 972     next_row = row_next( row );
 973     if (!next_row) break;
 974     row = next_row;
 975   }
 976
 977   if (!row && !final_eop && para_prev( para ))
 978   {
 979     /* The position is below the last paragraph, so the last row will be used
 980      * rather than the end of the text, so the x position will be used to
 981      * determine the offset closest to the pixel position. */
 982     isExact = FALSE;
 983     row = para_end_row( para_prev( para ) );
 984   }
 985
 986   if (row) return row_cursor( editor, row, x, result ) && isExact;
 987
 988   ME_SetCursorToEnd(editor, result, TRUE);
 989   return FALSE;
 990 }
 991
 992
 993 /* Sets the cursor to the position closest to the pixel position
 994  *
 995  * x & y are pixel positions in client coordinates.
 996  *
 997  * return TRUE if the run is directly under the pixel
 998  * position, FALSE if it not.
 999  */
1000 BOOL cursor_from_coords( ME_TextEditor *editor, int x, int y, ME_Cursor *cursor )
1001 {
1002     x += editor->horz_si.nPos;
1003     y += editor->vert_si.nPos;
1004     return cursor_from_virtual_coords( editor, x, y, cursor, FALSE );
1005 }
1006
1007
1008 /* Extends the selection with a word, line, or paragraph selection type.
1009  *
1010  * The selection is anchored by editor->pCursors[2-3] such that the text
1011  * between the anchors will remain selected, and one end will be extended.
1012  *
1013  * editor->pCursors[0] should have the position to extend the selection to
1014  * before this function is called.
1015  *
1016  * Nothing will be done if editor->nSelectionType equals stPosition.
1017  */
1018 static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
1019 {
1020   ME_Cursor tmp_cursor;
1021   int curOfs, anchorStartOfs, anchorEndOfs;
1022   if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
1023       return;
1024   curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
1025   anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
1026   anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
1027
1028   tmp_cursor = editor->pCursors[0];
1029   editor->pCursors[0] = editor->pCursors[2];
1030   editor->pCursors[1] = editor->pCursors[3];
1031   if (curOfs < anchorStartOfs)
1032   {
1033       /* Extend the left side of selection */
1034       editor->pCursors[1] = tmp_cursor;
1035       switch (editor->nSelectionType)
1036       {
1037       case stWord:
1038           ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
1039           break;
1040
1041       case stLine:
1042       {
1043           ME_Row *row = row_from_cursor( editor->pCursors + 1 );
1044           row_first_cursor( row, editor->pCursors + 1 );
1045           break;
1046       }
1047
1048       case stParagraph:
1049           editor->pCursors[1].run = para_first_run( editor->pCursors[1].para );
1050           editor->pCursors[1].nOffset = 0;
1051           break;
1052
1053       default:
1054           break;
1055       }
1056   }
1057   else if (curOfs >= anchorEndOfs)
1058   {
1059       /* Extend the right side of selection */
1060       editor->pCursors[0] = tmp_cursor;
1061       switch (editor->nSelectionType)
1062       {
1063       case stWord:
1064           ME_MoveCursorWords( editor, &editor->pCursors[0], +1 );
1065           break;
1066
1067       case stLine:
1068       {
1069           ME_Row *row = row_from_cursor( editor->pCursors );
1070           row_end_cursor( row, editor->pCursors, TRUE );
1071           break;
1072       }
1073
1074       case stParagraph:
1075           editor->pCursors[0].run = para_end_run( editor->pCursors[0].para );
1076           editor->pCursors[0].para = editor->pCursors[0].run->para;
1077           editor->pCursors[0].nOffset = editor->pCursors[0].run->len;
1078           break;
1079
1080       default:
1081           break;
1082       }
1083   }
1084 }
1085
1086 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1087 {
1088   ME_Cursor tmp_cursor;
1089   BOOL is_selection = FALSE, is_shift;
1090
1091   editor->nUDArrowX = -1;
1092
1093   x += editor->horz_si.nPos;
1094   y += editor->vert_si.nPos;
1095
1096   tmp_cursor = editor->pCursors[0];
1097   is_selection = ME_IsSelection(editor);
1098   is_shift = GetKeyState(VK_SHIFT) < 0;
1099
1100   cursor_from_virtual_coords( editor, x, y, &editor->pCursors[0], FALSE );
1101
1102   if (x >= editor->rcFormat.left || is_shift)
1103   {
1104     if (clickNum > 1)
1105     {
1106       editor->pCursors[1] = editor->pCursors[0];
1107       if (is_shift) {
1108           if (x >= editor->rcFormat.left)
1109               ME_SelectByType(editor, stWord);
1110           else
1111               ME_SelectByType(editor, stParagraph);
1112       } else if (clickNum % 2 == 0) {
1113           ME_SelectByType(editor, stWord);
1114       } else {
1115           ME_SelectByType(editor, stParagraph);
1116       }
1117     }
1118     else if (!is_shift)
1119     {
1120       editor->nSelectionType = stPosition;
1121       editor->pCursors[1] = editor->pCursors[0];
1122     }
1123     else if (!is_selection)
1124     {
1125       editor->nSelectionType = stPosition;
1126       editor->pCursors[1] = tmp_cursor;
1127     }
1128     else if (editor->nSelectionType != stPosition)
1129     {
1130       ME_ExtendAnchorSelection(editor);
1131     }
1132   }
1133   else
1134   {
1135     if (clickNum < 2) {
1136         ME_SelectByType(editor, stLine);
1137     } else if (clickNum % 2 == 0 || is_shift) {
1138         ME_SelectByType(editor, stParagraph);
1139     } else {
1140         ME_SelectByType(editor, stDocument);
1141     }
1142   }
1143   ME_InvalidateSelection(editor);
1144   update_caret(editor);
1145   ME_SendSelChange(editor);
1146 }
1147
1148 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
1149 {
1150   ME_Cursor tmp_cursor;
1151
1152   if (editor->nSelectionType == stDocument)
1153       return;
1154   x += editor->horz_si.nPos;
1155   y += editor->vert_si.nPos;
1156
1157   tmp_cursor = editor->pCursors[0];
1158   /* FIXME: do something with the return value of cursor_from_virtual_coords */
1159   cursor_from_virtual_coords( editor, x, y, &tmp_cursor, TRUE );
1160
1161   ME_InvalidateSelection(editor);
1162   editor->pCursors[0] = tmp_cursor;
1163   ME_ExtendAnchorSelection(editor);
1164
1165   if (editor->nSelectionType != stPosition &&
1166       memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1167       /* The scroll the cursor towards the other end, since it was the one
1168        * extended by ME_ExtendAnchorSelection */
1169       editor_ensure_visible( editor, &editor->pCursors[1] );
1170   else
1171       editor_ensure_visible( editor, &editor->pCursors[0] );
1172
1173   ME_InvalidateSelection(editor);
1174   update_caret(editor);
1175   ME_SendSelChange(editor);
1176 }
1177
1178 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1179 {
1180   ME_Run *run = pCursor->run;
1181   int x;
1182
1183   if (editor->nUDArrowX != -1)
1184     x = editor->nUDArrowX;
1185   else
1186   {
1187     x = run->pt.x;
1188     x += ME_PointFromChar( editor, run, pCursor->nOffset, TRUE );
1189     editor->nUDArrowX = x;
1190   }
1191   return x;
1192 }
1193
1194
1195 static void cursor_move_line( ME_TextEditor *editor, ME_Cursor *cursor, BOOL up, BOOL extend )
1196 {
1197     ME_Paragraph *old_para = cursor->para, *new_para;
1198     ME_Row *row = row_from_cursor( cursor );
1199     int x = ME_GetXForArrow( editor, cursor );
1200
1201     if (up)
1202     {
1203         /* start of the previous row */
1204         row = row_prev_all_paras( row );
1205         if (!row)
1206         {
1207             if (extend) ME_SetCursorToStart( editor, cursor );
1208             return;
1209         }
1210         new_para = row_para( row );
1211         if (old_para->nFlags & MEPF_ROWEND ||
1212             (para_cell( old_para ) && para_cell( old_para ) != para_cell( new_para )))
1213         {
1214             /* Brought out of a cell */
1215             new_para = para_prev( table_row_start( old_para ));
1216             if (!new_para) return; /* At the top, so don't go anywhere. */
1217             row = para_first_row( new_para );
1218         }
1219         if (new_para->nFlags & MEPF_ROWEND)
1220         {
1221             /* Brought into a table row */
1222             ME_Cell *cell = table_row_end_cell( new_para );
1223             while (x < cell->pt.x && cell_prev( cell ))
1224                 cell = cell_prev( cell );
1225             if (cell_next( cell )) /* else - we are still at the end of the row */
1226                 row = para_end_row( cell_end_para( cell ) );
1227         }
1228     }
1229     else
1230     {
1231         /* start of the next row */
1232         row = row_next_all_paras( row );
1233         if (!row)
1234         {
1235             if (extend) ME_SetCursorToEnd( editor, cursor, TRUE );
1236             return;
1237         }
1238         new_para = row_para( row );
1239         if (old_para->nFlags & MEPF_ROWSTART ||
1240             (para_cell( old_para ) && para_cell( old_para ) != para_cell( new_para )))
1241         {
1242             /* Brought out of a cell */
1243             new_para = para_next( table_row_end( old_para ) );
1244             if (!para_next( new_para )) return; /* At the bottom, so don't go anywhere. */
1245             row = para_first_row( new_para );
1246         }
1247         if (new_para->nFlags & MEPF_ROWSTART)
1248         {
1249             /* Brought into a table row */
1250             ME_Cell *cell = table_row_first_cell( new_para );
1251             while (cell_next( cell ) && x >= cell_next( cell )->pt.x)
1252                 cell = cell_next( cell );
1253             row = para_first_row( cell_first_para( cell ) );
1254         }
1255     }
1256     if (!row) return;
1257
1258     row_cursor( editor, row, x, cursor );
1259 }
1260
1261 static void ME_ArrowPageUp( ME_TextEditor *editor, ME_Cursor *cursor )
1262 {
1263     ME_Row *row = para_first_row( editor_first_para( editor ) ), *last_row;
1264     int x, yd, old_scroll_pos = editor->vert_si.nPos;
1265
1266     if (editor->vert_si.nPos < row->nHeight)
1267     {
1268         ME_SetCursorToStart( editor, cursor );
1269         /* Native clears seems to clear this x value on page up at the top
1270          * of the text, but not on page down at the end of the text.
1271          * Doesn't make sense, but we try to be bug for bug compatible. */
1272         editor->nUDArrowX = -1;
1273     }
1274     else
1275     {
1276         x = ME_GetXForArrow( editor, cursor );
1277         row = row_from_cursor( cursor );
1278
1279         ME_ScrollUp( editor, editor->sizeWindow.cy );
1280         /* Only move the cursor by the amount scrolled. */
1281         yd = cursor->para->pt.y + row->pt.y + editor->vert_si.nPos - old_scroll_pos;
1282         last_row = row;
1283
1284         while ((row = row_prev_all_paras( row )))
1285         {
1286             if (row_para( row )->pt.y + row->pt.y < yd) break;
1287             last_row = row;
1288         }
1289
1290         row_cursor( editor, last_row, x, cursor );
1291     }
1292 }
1293
1294 static void ME_ArrowPageDown( ME_TextEditor *editor, ME_Cursor *cursor )
1295 {
1296     ME_Row *row = para_end_row( para_prev( editor_end_para( editor ) ) ), *last_row;
1297     int x, yd, old_scroll_pos = editor->vert_si.nPos;
1298
1299     x = ME_GetXForArrow( editor, cursor );
1300
1301     if (editor->vert_si.nPos >= row_para( row )->pt.y + row->pt.y - editor->sizeWindow.cy)
1302         ME_SetCursorToEnd( editor, cursor, FALSE );
1303     else
1304     {
1305         row = row_from_cursor( cursor );
1306
1307         /* For native richedit controls:
1308          * v1.0 - v3.1 can only scroll down as far as the scrollbar lets us
1309          * v4.1 can scroll past this position here. */
1310         ME_ScrollDown( editor, editor->sizeWindow.cy );
1311         /* Only move the cursor by the amount scrolled. */
1312         yd = cursor->para->pt.y + row->pt.y + editor->vert_si.nPos - old_scroll_pos;
1313         last_row = row;
1314
1315         while ((row = row_next_all_paras( row )))
1316         {
1317             if (row_para( row )->pt.y + row->pt.y >= yd) break;
1318             last_row = row;
1319         }
1320
1321         row_cursor( editor, last_row, x, cursor );
1322     }
1323 }
1324
1325 static void ME_ArrowHome( ME_TextEditor *editor, ME_Cursor *cursor )
1326 {
1327     ME_Row *row = row_from_cursor( cursor );
1328
1329     row_first_cursor( row, cursor );
1330 }
1331
1332 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1333 {
1334   ME_SetCursorToStart(editor, pCursor);
1335 }
1336
1337 static void ME_ArrowEnd( ME_TextEditor *editor, ME_Cursor *cursor )
1338 {
1339     ME_Row *row = row_from_cursor( cursor );
1340
1341     row_end_cursor( row, cursor, FALSE );
1342 }
1343
1344 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1345 {
1346   ME_SetCursorToEnd(editor, pCursor, FALSE);
1347 }
1348
1349 BOOL ME_IsSelection(ME_TextEditor *editor)
1350 {
1351   return editor->pCursors[0].run != editor->pCursors[1].run ||
1352          editor->pCursors[0].nOffset != editor->pCursors[1].nOffset;
1353 }
1354
1355 void ME_DeleteSelection(ME_TextEditor *editor)
1356 {
1357   LONG from, to;
1358   int nStartCursor = ME_GetSelectionOfs(editor, &from, &to);
1359   int nEndCursor = nStartCursor ^ 1;
1360   ME_DeleteTextAtCursor(editor, nStartCursor, to - from);
1361   editor->pCursors[nEndCursor] = editor->pCursors[nStartCursor];
1362 }
1363
1364 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1365 {
1366     return style_get_insert_style( editor, editor->pCursors );
1367 }
1368
1369 void ME_SendSelChange(ME_TextEditor *editor)
1370 {
1371   SELCHANGE sc;
1372
1373   sc.nmhdr.hwndFrom = NULL;
1374   sc.nmhdr.idFrom = 0;
1375   sc.nmhdr.code = EN_SELCHANGE;
1376   ME_GetSelectionOfs(editor, &sc.chrg.cpMin, &sc.chrg.cpMax);
1377   sc.seltyp = SEL_EMPTY;
1378   if (sc.chrg.cpMin != sc.chrg.cpMax)
1379     sc.seltyp |= SEL_TEXT;
1380   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* what were RICHEDIT authors thinking ? */
1381     sc.seltyp |= SEL_MULTICHAR;
1382
1383   if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1384   {
1385     ME_ClearTempStyle(editor);
1386
1387     editor->notified_cr = sc.chrg;
1388
1389     if (editor->nEventMask & ENM_SELCHANGE)
1390     {
1391       TRACE("cpMin=%ld cpMax=%ld seltyp=%d (%s %s)\n",
1392             sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1393             (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1394             (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1395       ITextHost_TxNotify(editor->texthost, sc.nmhdr.code, &sc);
1396     }
1397   }
1398 }
1399
1400 BOOL
1401 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1402 {
1403   int nCursor = 0;
1404   ME_Cursor *p = &editor->pCursors[nCursor];
1405   ME_Cursor tmp_curs = *p;
1406   BOOL success = FALSE;
1407
1408   ME_CheckCharOffsets(editor);
1409   switch(nVKey) {
1410     case VK_LEFT:
1411       if (ctrl)
1412         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1413       else
1414         success = ME_MoveCursorChars(editor, &tmp_curs, -1, extend);
1415       break;
1416     case VK_RIGHT:
1417       if (ctrl)
1418         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1419       else
1420         success = ME_MoveCursorChars(editor, &tmp_curs, +1, extend);
1421       break;
1422     case VK_UP:
1423       cursor_move_line( editor, &tmp_curs, TRUE, extend );
1424       break;
1425     case VK_DOWN:
1426       cursor_move_line( editor, &tmp_curs, FALSE, extend );
1427       break;
1428     case VK_PRIOR:
1429       ME_ArrowPageUp(editor, &tmp_curs);
1430       break;
1431     case VK_NEXT:
1432       ME_ArrowPageDown(editor, &tmp_curs);
1433       break;
1434     case VK_HOME: {
1435       if (ctrl)
1436         ME_ArrowCtrlHome(editor, &tmp_curs);
1437       else
1438         ME_ArrowHome(editor, &tmp_curs);
1439       break;
1440     }
1441     case VK_END:
1442       if (ctrl)
1443         ME_ArrowCtrlEnd(editor, &tmp_curs);
1444       else
1445         ME_ArrowEnd(editor, &tmp_curs);
1446       break;
1447   }
1448
1449   if (!extend)
1450     editor->pCursors[1] = tmp_curs;
1451   *p = tmp_curs;
1452
1453   ME_InvalidateSelection(editor);
1454   ME_Repaint(editor);
1455   hide_caret(editor);
1456   editor_ensure_visible( editor, &tmp_curs );
1457   update_caret(editor);
1458   ME_SendSelChange(editor);
1459   return success;
1460 }