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 static BOOL
  28 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs);
  29
  30
  31 void ME_GetSelection(ME_TextEditor *editor, int *from, int *to)
  32 {
  33   *from = ME_GetCursorOfs(editor, 0);
  34   *to =   ME_GetCursorOfs(editor, 1);
  35
  36   if (*from > *to)
  37   {
  38     int tmp = *from;
  39     *from = *to;
  40     *to = tmp;
  41   }
  42 }
  43
  44 int ME_GetTextLength(ME_TextEditor *editor)
  45 {
  46   return ME_CharOfsFromRunOfs(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun), 0);
  47 }
  48
  49
  50 int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
  51 {
  52   int length;
  53
  54   if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
  55     return E_INVALIDARG;
  56   if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
  57     return E_INVALIDARG;
  58
  59   length = ME_GetTextLength(editor);
  60
  61   if ((GetWindowLongW(editor->hWnd, GWL_STYLE) & ES_MULTILINE) && (how->flags & GTL_USECRLF))
  62     length += editor->nParagraphs;
  63
  64   if (how->flags & GTL_NUMBYTES)
  65   {
  66     CPINFO cpinfo;
  67
  68     if (how->codepage == 1200)
  69       return length * 2;
  70     if (how->flags & GTL_PRECISE)
  71       FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
  72     if (GetCPInfo(how->codepage, &cpinfo))
  73       return length * cpinfo.MaxCharSize;
  74     ERR("Invalid codepage %u\n", how->codepage);
  75     return E_INVALIDARG;
  76   }
  77   return length;
  78 }
  79
  80
  81 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
  82 {
  83   int selectionEnd = 0;
  84   const int len = ME_GetTextLength(editor);
  85
  86   /* all negative values are effectively the same */
  87   if (from < 0)
  88     from = -1;
  89   if (to < 0)
  90     to = -1;
  91
  92   /* select all */
  93   if (from == 0 && to == -1)
  94   {
  95     editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
  96     editor->pCursors[1].nOffset = 0;
  97     editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  98     editor->pCursors[0].nOffset = 0;
  99     ME_InvalidateSelection(editor);
 100     ME_ClearTempStyle(editor);
 101     return len + 1;
 102   }
 103
 104   /* if both values are equal and also out of bound, that means to */
 105   /* put the selection at the end of the text */
 106   if ((from == to) && (to < 0 || to > len))
 107   {
 108     selectionEnd = 1;
 109   }
 110   else
 111   {
 112     /* if from is negative and to is positive then selection is */
 113     /* deselected and caret moved to end of the current selection */
 114     if (from < 0)
 115     {
 116       int start, end;
 117       ME_GetSelection(editor, &start, &end);
 118       editor->pCursors[1] = editor->pCursors[0];
 119       ME_Repaint(editor);
 120       ME_ClearTempStyle(editor);
 121       return end;
 122     }
 123
 124     /* adjust to if it's a negative value */
 125     if (to < 0)
 126       to = len + 1;
 127
 128     /* flip from and to if they are reversed */
 129     if (from>to)
 130     {
 131       int tmp = from;
 132       from = to;
 133       to = tmp;
 134     }
 135
 136     /* after fiddling with the values, we find from > len && to > len */
 137     if (from > len)
 138       selectionEnd = 1;
 139     /* special case with to too big */
 140     else if (to > len)
 141       to = len + 1;
 142   }
 143
 144   if (selectionEnd)
 145   {
 146     editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 147     editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
 148     ME_InvalidateSelection(editor);
 149     ME_ClearTempStyle(editor);
 150     return len;
 151   }
 152
 153   ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
 154   ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
 155   return to;
 156 }
 157
 158
 159 void
 160 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
 161                         int *x, int *y, int *height)
 162 {
 163   ME_DisplayItem *pCursorRun = pCursor->pRun;
 164   ME_DisplayItem *pSizeRun = pCursor->pRun;
 165
 166   assert(!pCursor->nOffset || !editor->bCaretAtEnd);
 167   assert(height && x && y);
 168   assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
 169   assert(pCursor->pRun);
 170   assert(pCursor->pRun->type == diRun);
 171
 172   if (pCursorRun->type == diRun) {
 173     ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
 174
 175     if (row) {
 176       HDC hDC = GetDC(editor->hWnd);
 177       ME_Context c;
 178       ME_DisplayItem *run = pCursorRun;
 179       ME_DisplayItem *para = NULL;
 180       SIZE sz = {0, 0};
 181
 182       ME_InitContext(&c, editor, hDC);
 183
 184       if (!pCursor->nOffset && !editor->bCaretAtEnd)
 185       {
 186         ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrStartRow);
 187         assert(prev);
 188         if (prev->type == diRun)
 189           pSizeRun = prev;
 190       }
 191       assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
 192       para = ME_FindItemBack(row, diParagraph);
 193       assert(para);
 194       assert(para->type == diParagraph);
 195       if (editor->bCaretAtEnd && !pCursor->nOffset &&
 196           run == ME_FindItemFwd(row, diRun))
 197       {
 198         ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
 199         assert(tmp);
 200         if (tmp->type == diRun)
 201         {
 202           row = ME_FindItemBack(tmp, diStartRow);
 203           pSizeRun = run = tmp;
 204           assert(run);
 205           assert(run->type == diRun);
 206           sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, ME_StrLen(run->member.run.strText));
 207         }
 208       }
 209       if (pCursor->nOffset && !(run->member.run.nFlags & MERF_SKIPPED)) {
 210         sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset);
 211       }
 212
 213       *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
 214       *x = run->member.run.pt.x + sz.cx;
 215       *y = para->member.para.nYPos + row->member.row.nBaseline + pSizeRun->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
 216
 217       ME_DestroyContext(&c);
 218       ReleaseDC(editor->hWnd, hDC);
 219       return;
 220     }
 221   }
 222   *height = 10; /* FIXME use global font */
 223   *x = 0;
 224   *y = 0;
 225 }
 226
 227
 228 void
 229 ME_MoveCaret(ME_TextEditor *editor)
 230 {
 231   int x, y, height;
 232
 233   if (ME_WrapMarkedParagraphs(editor))
 234     ME_UpdateScrollBar(editor);
 235   ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
 236   if(editor->bHaveFocus)
 237   {
 238     CreateCaret(editor->hWnd, NULL, 0, height);
 239     SetCaretPos(x, y);
 240   }
 241 }
 242
 243
 244 void ME_ShowCaret(ME_TextEditor *ed)
 245 {
 246   ME_MoveCaret(ed);
 247   if(ed->bHaveFocus)
 248     ShowCaret(ed->hWnd);
 249 }
 250
 251 void ME_HideCaret(ME_TextEditor *ed)
 252 {
 253   if(ed->bHaveFocus)
 254   {
 255     HideCaret(ed->hWnd);
 256     DestroyCaret();
 257   }
 258 }
 259
 260 void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
 261   int nChars)
 262 {
 263   ME_Cursor c;
 264   int shift = 0;
 265
 266   while(nChars > 0)
 267   {
 268     ME_Run *run;
 269     ME_CursorFromCharOfs(editor, nOfs, &c);
 270     run = &c.pRun->member.run;
 271     if (run->nFlags & MERF_ENDPARA) {
 272       if (!ME_FindItemFwd(c.pRun, diParagraph))
 273       {
 274         return;
 275       }
 276       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 277       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 278       ME_CheckCharOffsets(editor);
 279       nChars--;
 280       if (editor->bEmulateVersion10 && nChars)
 281         nChars--;
 282       continue;
 283     }
 284     else
 285     {
 286       ME_Cursor cursor;
 287       int nIntendedChars = nChars;
 288       int nCharsToDelete = nChars;
 289       int i;
 290       int loc = c.nOffset;
 291
 292       ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
 293
 294       cursor = c;
 295       ME_StrRelPos(run->strText, loc, &nChars);
 296       /* nChars is the number of characters that should be deleted from the
 297          FOLLOWING runs (these AFTER cursor.pRun)
 298          nCharsToDelete is a number of chars to delete from THIS run */
 299       nCharsToDelete -= nChars;
 300       shift -= nCharsToDelete;
 301       TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
 302         nCharsToDelete, nIntendedChars, nChars, c.nOffset,
 303         debugstr_w(run->strText->szData), run->strText->nLen);
 304
 305       if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
 306       {
 307         /* undo = reinsert whole run */
 308         /* nOfs is a character offset (from the start of the document
 309            to the current (deleted) run */
 310         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 311         if (pUndo)
 312           pUndo->di.member.run.nCharOfs = nOfs;
 313       }
 314       else
 315       {
 316         /* undo = reinsert partial run */
 317         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 318         if (pUndo) {
 319           ME_DestroyString(pUndo->di.member.run.strText);
 320           pUndo->di.member.run.nCharOfs = nOfs;
 321           pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
 322         }
 323       }
 324       TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
 325       TRACE("Shift value: %d\n", shift);
 326       ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
 327
 328       /* update cursors (including c) */
 329       for (i=-1; i<editor->nCursors; i++) {
 330         ME_Cursor *pThisCur = editor->pCursors + i;
 331         if (i == -1) pThisCur = &c;
 332         if (pThisCur->pRun == cursor.pRun) {
 333           if (pThisCur->nOffset > cursor.nOffset) {
 334             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 335               pThisCur->nOffset = cursor.nOffset;
 336             else
 337               pThisCur->nOffset -= nCharsToDelete;
 338             assert(pThisCur->nOffset >= 0);
 339             assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
 340           }
 341           if (pThisCur->nOffset == ME_StrVLen(run->strText))
 342           {
 343             pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
 344             assert(pThisCur->pRun->type == diRun);
 345             pThisCur->nOffset = 0;
 346           }
 347         }
 348       }
 349
 350       /* c = updated data now */
 351
 352       if (c.pRun == cursor.pRun)
 353         ME_SkipAndPropagateCharOffset(c.pRun, shift);
 354       else
 355         ME_PropagateCharOffset(c.pRun, shift);
 356
 357       if (!ME_StrVLen(cursor.pRun->member.run.strText))
 358       {
 359         TRACE("Removing useless run\n");
 360         ME_Remove(cursor.pRun);
 361         ME_DestroyDisplayItem(cursor.pRun);
 362       }
 363
 364       shift = 0;
 365       /*
 366       ME_CheckCharOffsets(editor);
 367       */
 368       continue;
 369     }
 370   }
 371 }
 372
 373 void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
 374   int nChars)
 375 {
 376   assert(nCursor>=0 && nCursor<editor->nCursors);
 377   /* text operations set modified state */
 378   editor->nModifyStep = 1;
 379   ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
 380 }
 381
 382 static ME_DisplayItem *
 383 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 384                                 const WCHAR *str, int len, ME_Style *style,
 385                                 int flags)
 386 {
 387   ME_Cursor *p = &editor->pCursors[nCursor];
 388
 389   editor->bCaretAtEnd = FALSE;
 390
 391   assert(p->pRun->type == diRun);
 392
 393   return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
 394 }
 395
 396
 397 /* FIXME this is temporary, just to have something to test how bad graphics handler is */
 398 void ME_InsertGraphicsFromCursor(ME_TextEditor *editor, int nCursor)
 399 {
 400   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 401   WCHAR space = ' ';
 402
 403   /* FIXME no no no */
 404   if (ME_IsSelection(editor))
 405     ME_DeleteSelection(editor);
 406
 407   ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 408                                   MERF_GRAPHICS);
 409   ME_SendSelChange(editor);
 410 }
 411
 412
 413 void
 414 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 415 {
 416   WCHAR tab = '\t';
 417   ME_DisplayItem *p, *run;
 418   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 419
 420   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 421                                       MERF_CELL);
 422   run = p;
 423   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 424   {
 425     if (run->member.run.nFlags & MERF_CELL)
 426     {
 427       assert(run->member.run.pCell->next);
 428       p->member.run.pCell = run->member.run.pCell->next;
 429       return;
 430     }
 431   }
 432   assert(run->type == diParagraph);
 433   assert(run->member.para.bTable);
 434   assert(run->member.para.pCells);
 435   p->member.run.pCell = run->member.para.pCells;
 436 }
 437
 438
 439 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 440   const WCHAR *str, int len, ME_Style *style)
 441 {
 442   const WCHAR *pos;
 443   ME_Cursor *p = NULL;
 444   int oldLen;
 445
 446   /* FIXME really HERE ? */
 447   if (ME_IsSelection(editor))
 448     ME_DeleteSelection(editor);
 449
 450   /* FIXME: is this too slow? */
 451   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 452   oldLen = ME_GetTextLength(editor);
 453
 454   /* text operations set modified state */
 455   editor->nModifyStep = 1;
 456
 457   assert(style);
 458
 459   assert(nCursor>=0 && nCursor<editor->nCursors);
 460   if (len == -1)
 461     len = lstrlenW(str);
 462
 463   /* grow the text limit to fit our text */
 464   if(editor->nTextLimit < oldLen +len)
 465     editor->nTextLimit = oldLen + len;
 466
 467   while (len)
 468   {
 469     pos = str;
 470     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 471     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 472       pos++;
 473     if (pos-str < len && *pos == '\t') { /* handle tabs */
 474       WCHAR tab = '\t';
 475
 476       if (pos!=str)
 477         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 478
 479       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 480
 481       pos++;
 482       if(pos-str <= len) {
 483         len -= pos - str;
 484         str = pos;
 485         continue;
 486       }
 487     }
 488     /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 489     if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
 490       WCHAR space = ' ';
 491
 492       if (pos!=str)
 493         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 494
 495       ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
 496
 497       pos+=3;
 498       if(pos-str <= len) {
 499         len -= pos - str;
 500         str = pos;
 501         continue;
 502       }
 503     }
 504     if (pos-str < len) {   /* handle EOLs */
 505       ME_DisplayItem *tp, *end_run;
 506       ME_Style *tmp_style;
 507       if (pos!=str)
 508         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 509       p = &editor->pCursors[nCursor];
 510       if (p->nOffset) {
 511         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 512         p = &editor->pCursors[nCursor];
 513       }
 514       tmp_style = ME_GetInsertStyle(editor, nCursor);
 515       /* ME_SplitParagraph increases style refcount */
 516       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style);
 517       p->pRun = ME_FindItemFwd(tp, diRun);
 518       end_run = ME_FindItemBack(tp, diRun);
 519       ME_ReleaseStyle(end_run->member.run.style);
 520       end_run->member.run.style = tmp_style;
 521       p->nOffset = 0;
 522       if(pos-str < len && *pos =='\r')
 523         pos++;
 524       if(pos-str < len && *pos =='\n')
 525         pos++;
 526       if(pos-str <= len) {
 527         len -= pos - str;
 528         str = pos;
 529         continue;
 530       }
 531     }
 532     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 533     len = 0;
 534   }
 535 }
 536
 537
 538 static BOOL
 539 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 540 {
 541   ME_DisplayItem *pRun = pCursor->pRun;
 542
 543   if (nRelOfs == -1)
 544   {
 545     if (!pCursor->nOffset)
 546     {
 547       do {
 548         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 549         assert(pRun);
 550         switch (pRun->type)
 551         {
 552           case diRun:
 553             break;
 554           case diParagraph:
 555             if (pRun->member.para.prev_para->type == diTextStart)
 556               return FALSE;
 557             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 558             /* every paragraph ought to have at least one run */
 559             assert(pRun && pRun->type == diRun);
 560             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 561             break;
 562           default:
 563             assert(pRun->type != diRun && pRun->type != diParagraph);
 564             return FALSE;
 565         }
 566       } while (RUN_IS_HIDDEN(&pRun->member.run));
 567       pCursor->pRun = pRun;
 568       if (pRun->member.run.nFlags & MERF_ENDPARA)
 569         pCursor->nOffset = 0;
 570       else
 571         pCursor->nOffset = pRun->member.run.strText->nLen;
 572     }
 573
 574     if (pCursor->nOffset)
 575       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 576     return TRUE;
 577   }
 578   else
 579   {
 580     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 581     {
 582       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 583
 584       if (new_ofs < pRun->member.run.strText->nLen)
 585       {
 586         pCursor->nOffset = new_ofs;
 587         return TRUE;
 588       }
 589     }
 590     do {
 591       pRun = ME_FindItemFwd(pRun, diRun);
 592     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 593     if (pRun)
 594     {
 595       pCursor->pRun = pRun;
 596       pCursor->nOffset = 0;
 597       return TRUE;
 598     }
 599   }
 600   return FALSE;
 601 }
 602
 603
 604 static BOOL
 605 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 606 {
 607   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 608   int nOffset = cursor->nOffset;
 609
 610   if (nRelOfs == -1)
 611   {
 612     /* Backward movement */
 613     while (TRUE)
 614     {
 615       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 616                                      nOffset, WB_MOVEWORDLEFT);
 617        if (nOffset)
 618         break;
 619       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 620       if (pOtherRun->type == diRun)
 621       {
 622         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 623                                  pOtherRun->member.run.strText->nLen - 1,
 624                                  WB_ISDELIMITER)
 625             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 626             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 627             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 628                                      WB_ISDELIMITER))
 629           break;
 630         pRun = pOtherRun;
 631         nOffset = pOtherRun->member.run.strText->nLen;
 632       }
 633       else if (pOtherRun->type == diParagraph)
 634       {
 635         if (cursor->pRun == pRun && cursor->nOffset == 0)
 636         {
 637           /* Paragraph breaks are treated as separate words */
 638           if (pOtherRun->member.para.prev_para->type == diTextStart)
 639             return FALSE;
 640           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 641         }
 642         break;
 643       }
 644     }
 645   }
 646   else
 647   {
 648     /* Forward movement */
 649     BOOL last_delim = FALSE;
 650
 651     while (TRUE)
 652     {
 653       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 654                                               nOffset, WB_ISDELIMITER))
 655         break;
 656       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 657                                      nOffset, WB_MOVEWORDRIGHT);
 658       if (nOffset < pRun->member.run.strText->nLen)
 659         break;
 660       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 661       if (pOtherRun->type == diRun)
 662       {
 663         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 664                                           nOffset - 1, WB_ISDELIMITER);
 665         pRun = pOtherRun;
 666         nOffset = 0;
 667       }
 668       else if (pOtherRun->type == diParagraph)
 669       {
 670         if (cursor->pRun == pRun)
 671           pRun = ME_FindItemFwd(pOtherRun, diRun);
 672         nOffset = 0;
 673         break;
 674       }
 675       else /* diTextEnd */
 676       {
 677         if (cursor->pRun == pRun)
 678           return FALSE;
 679         nOffset = 0;
 680         break;
 681       }
 682     }
 683   }
 684   cursor->pRun = pRun;
 685   cursor->nOffset = nOffset;
 686   return TRUE;
 687 }
 688
 689
 690 void
 691 ME_SelectWord(ME_TextEditor *editor)
 692 {
 693   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 694     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 695   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 696   ME_InvalidateSelection(editor);
 697   ME_SendSelChange(editor);
 698 }
 699
 700
 701 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 702 {
 703   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 704   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 705     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 706 }
 707
 708 int ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 709 {
 710   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 711   int rx = 0;
 712
 713   if (is_eol)
 714     *is_eol = 0;
 715
 716   while(p != editor->pBuffer->pLast)
 717   {
 718     if (p->type == diParagraph)
 719     {
 720       int ry = y - p->member.para.nYPos;
 721       if (ry < 0)
 722       {
 723         result->pRun = ME_FindItemFwd(p, diRun);
 724         result->nOffset = 0;
 725         return 0;
 726       }
 727       if (ry >= p->member.para.nHeight)
 728       {
 729         p = p->member.para.next_para;
 730         continue;
 731       }
 732       p = ME_FindItemFwd(p, diStartRow);
 733       y = ry;
 734       continue;
 735     }
 736     if (p->type == diStartRow)
 737     {
 738       int ry = y - p->member.row.nYPos;
 739       if (ry < 0)
 740         return 0;
 741       if (ry >= p->member.row.nHeight)
 742       {
 743         p = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 744         if (p->type != diStartRow)
 745           return 0;
 746         continue;
 747       }
 748       p = ME_FindItemFwd(p, diRun);
 749       continue;
 750     }
 751     if (p->type == diRun)
 752     {
 753       ME_DisplayItem *pp;
 754       rx = x - p->member.run.pt.x;
 755       if (rx < 0)
 756         rx = 0;
 757       if (rx >= p->member.run.nWidth) /* not this run yet... find next item */
 758       {
 759         pp = p;
 760         do {
 761           p = p->next;
 762           if (p->type == diRun)
 763           {
 764             rx = x - p->member.run.pt.x;
 765             goto continue_search;
 766           }
 767           if (p->type == diStartRow)
 768           {
 769             p = ME_FindItemFwd(p, diRun);
 770             if (is_eol)
 771               *is_eol = 1;
 772             rx = 0; /* FIXME not sure */
 773             goto found_here;
 774           }
 775           if (p->type == diParagraph || p->type == diTextEnd)
 776           {
 777             rx = 0; /* FIXME not sure */
 778             p = pp;
 779             goto found_here;
 780           }
 781         } while(1);
 782         continue;
 783       }
 784     found_here:
 785       if (p->member.run.nFlags & MERF_ENDPARA)
 786         rx = 0;
 787       result->pRun = p;
 788       result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 789       if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 790       {
 791         result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 792         result->nOffset = 0;
 793       }
 794       return 1;
 795     }
 796     assert(0);
 797   continue_search:
 798     ;
 799   }
 800   result->pRun = ME_FindItemBack(p, diRun);
 801   result->nOffset = 0;
 802   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 803   return 0;
 804 }
 805
 806
 807 int
 808 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 809 {
 810   ME_Cursor cursor;
 811   RECT rc;
 812
 813   GetClientRect(editor->hWnd, &rc);
 814   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 815     return -1;
 816   y += ME_GetYScrollPos(editor);
 817   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 818   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 819           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 820 }
 821
 822
 823 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 824 {
 825   ME_Cursor tmp_cursor;
 826   int is_selection = 0;
 827
 828   editor->nUDArrowX = -1;
 829
 830   y += ME_GetYScrollPos(editor);
 831
 832   tmp_cursor = editor->pCursors[0];
 833   is_selection = ME_IsSelection(editor);
 834
 835   ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 836
 837   if (GetKeyState(VK_SHIFT)>=0)
 838   {
 839     editor->pCursors[1] = editor->pCursors[0];
 840   }
 841   else
 842   {
 843     if (!is_selection) {
 844       editor->pCursors[1] = tmp_cursor;
 845       is_selection = 1;
 846     }
 847   }
 848   ME_InvalidateSelection(editor);
 849   HideCaret(editor->hWnd);
 850   ME_MoveCaret(editor);
 851   ShowCaret(editor->hWnd);
 852   ME_ClearTempStyle(editor);
 853   ME_SendSelChange(editor);
 854 }
 855
 856 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 857 {
 858   ME_Cursor tmp_cursor;
 859
 860   y += ME_GetYScrollPos(editor);
 861
 862   tmp_cursor = editor->pCursors[0];
 863   /* FIXME: do something with the return value of ME_FindPixelPos */
 864   ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 865
 866   if (tmp_cursor.pRun == editor->pCursors[0].pRun &&
 867       tmp_cursor.nOffset == editor->pCursors[0].nOffset)
 868     return;
 869
 870   ME_InvalidateSelection(editor);
 871   editor->pCursors[0] = tmp_cursor;
 872   HideCaret(editor->hWnd);
 873   ME_MoveCaret(editor);
 874   ME_InvalidateSelection(editor);
 875   ShowCaret(editor->hWnd);
 876   ME_SendSelChange(editor);
 877 }
 878
 879 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 880                                 int x, int *pOffset, int *pbCaretAtEnd)
 881 {
 882   ME_DisplayItem *pNext, *pLastRun;
 883   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 884   assert(pNext->type == diRun);
 885   pLastRun = pNext;
 886   *pbCaretAtEnd = FALSE;
 887   do {
 888     int run_x = pNext->member.run.pt.x;
 889     int width = pNext->member.run.nWidth;
 890     if (x < run_x)
 891     {
 892       if (pOffset) *pOffset = 0;
 893       return pNext;
 894     }
 895     if (x >= run_x && x < run_x+width)
 896     {
 897       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 898       ME_String *s = pNext->member.run.strText;
 899       if (ch < s->nLen) {
 900         if (pOffset)
 901           *pOffset = ch;
 902         return pNext;
 903       }
 904     }
 905     pLastRun = pNext;
 906     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
 907   } while(pNext && pNext->type == diRun);
 908
 909   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
 910   {
 911     pNext = ME_FindItemFwd(pNext, diRun);
 912     if (pbCaretAtEnd) *pbCaretAtEnd = 1;
 913     if (pOffset) *pOffset = 0;
 914     return pNext;
 915   } else {
 916     if (pbCaretAtEnd) *pbCaretAtEnd = 0;
 917     if (pOffset) *pOffset = 0;
 918     return pLastRun;
 919   }
 920 }
 921
 922 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
 923 {
 924   ME_DisplayItem *pRun = pCursor->pRun;
 925   int x;
 926
 927   if (editor->nUDArrowX != -1)
 928     x = editor->nUDArrowX;
 929   else {
 930     if (editor->bCaretAtEnd)
 931     {
 932       pRun = ME_FindItemBack(pRun, diRun);
 933       assert(pRun);
 934       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
 935     }
 936     else {
 937       x = pRun->member.run.pt.x;
 938       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
 939     }
 940     editor->nUDArrowX = x;
 941   }
 942   return x;
 943 }
 944
 945
 946 static void
 947 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 948 {
 949   ME_DisplayItem *pRun = pCursor->pRun;
 950   ME_DisplayItem *pItem;
 951   int x = ME_GetXForArrow(editor, pCursor);
 952
 953   if (editor->bCaretAtEnd && !pCursor->nOffset)
 954     pRun = ME_FindItemBack(pRun, diRun);
 955   if (!pRun)
 956     return;
 957   if (nRelOfs == -1)
 958   {
 959     /* start of this row */
 960     pItem = ME_FindItemBack(pRun, diStartRow);
 961     assert(pItem);
 962     /* start of the previous row */
 963     pItem = ME_FindItemBack(pItem, diStartRow);
 964   }
 965   else
 966   {
 967     /* start of the next row */
 968     pItem = ME_FindItemFwd(pRun, diStartRow);
 969     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
 970     */
 971   }
 972   if (!pItem)
 973   {
 974     /* row not found - ignore */
 975     return;
 976   }
 977   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
 978   assert(pCursor->pRun);
 979   assert(pCursor->pRun->type == diRun);
 980 }
 981
 982
 983 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
 984 {
 985   ME_DisplayItem *pRun = pCursor->pRun;
 986   ME_DisplayItem *pLast, *p;
 987   int x, y, ys, yd, yp, yprev;
 988   ME_Cursor tmp_curs = *pCursor;
 989
 990   x = ME_GetXForArrow(editor, pCursor);
 991   if (!pCursor->nOffset && editor->bCaretAtEnd)
 992     pRun = ME_FindItemBack(pRun, diRun);
 993
 994   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
 995   assert(p->type == diStartRow);
 996   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
 997   yprev = ys = y = yp + p->member.row.nYPos;
 998   yd = y - editor->sizeWindow.cy;
 999   pLast = p;
1000
1001   do {
1002     p = ME_FindItemBack(p, diStartRowOrParagraph);
1003     if (!p)
1004       break;
1005     if (p->type == diParagraph) { /* crossing paragraphs */
1006       if (p->member.para.prev_para == NULL)
1007         break;
1008       yp = p->member.para.prev_para->member.para.nYPos;
1009       continue;
1010     }
1011     y = yp + p->member.row.nYPos;
1012     if (y < yd)
1013       break;
1014     pLast = p;
1015     yprev = y;
1016   } while(1);
1017
1018   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1019   ME_UpdateSelection(editor, &tmp_curs);
1020   if (yprev < editor->sizeWindow.cy)
1021   {
1022     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1023     ME_Repaint(editor);
1024   }
1025   else
1026   {
1027     ME_ScrollUp(editor, ys-yprev);
1028   }
1029   assert(pCursor->pRun);
1030   assert(pCursor->pRun->type == diRun);
1031 }
1032
1033 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1034    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1035    In such a situation, clicking the scrollbar restores its position back to the
1036    normal range (ie. sets it to (doclength-screenheight)). */
1037
1038 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1039 {
1040   ME_DisplayItem *pRun = pCursor->pRun;
1041   ME_DisplayItem *pLast, *p;
1042   int x, y, ys, yd, yp, yprev;
1043   ME_Cursor tmp_curs = *pCursor;
1044
1045   x = ME_GetXForArrow(editor, pCursor);
1046   if (!pCursor->nOffset && editor->bCaretAtEnd)
1047     pRun = ME_FindItemBack(pRun, diRun);
1048
1049   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1050   assert(p->type == diStartRow);
1051   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1052   yprev = ys = y = yp + p->member.row.nYPos;
1053   yd = y + editor->sizeWindow.cy;
1054   pLast = p;
1055
1056   do {
1057     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1058     if (!p)
1059       break;
1060     if (p->type == diParagraph) {
1061       yp = p->member.para.nYPos;
1062       continue;
1063     }
1064     y = yp + p->member.row.nYPos;
1065     if (y >= yd)
1066       break;
1067     pLast = p;
1068     yprev = y;
1069   } while(1);
1070
1071   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1072   ME_UpdateSelection(editor, &tmp_curs);
1073   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1074   {
1075     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1076     ME_Repaint(editor);
1077   }
1078   else
1079   {
1080     ME_ScrollUp(editor,ys-yprev);
1081   }
1082   assert(pCursor->pRun);
1083   assert(pCursor->pRun->type == diRun);
1084 }
1085
1086 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1087 {
1088   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1089   /* bCaretAtEnd doesn't make sense if the cursor isn't set at the
1090   first character of the next row */
1091   assert(!editor->bCaretAtEnd || !pCursor->nOffset);
1092   ME_WrapMarkedParagraphs(editor);
1093   if (pRow) {
1094     ME_DisplayItem *pRun;
1095     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1096       pRow = ME_FindItemBack(pRow, diStartRow);
1097       if (!pRow)
1098         return;
1099     }
1100     pRun = ME_FindItemFwd(pRow, diRun);
1101     if (pRun) {
1102       pCursor->pRun = pRun;
1103       pCursor->nOffset = 0;
1104     }
1105   }
1106   editor->bCaretAtEnd = FALSE;
1107 }
1108
1109 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1110 {
1111   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1112   if (pRow) {
1113     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1114     if (pRun) {
1115       pCursor->pRun = pRun;
1116       pCursor->nOffset = 0;
1117     }
1118   }
1119 }
1120
1121 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1122 {
1123   ME_DisplayItem *pRow;
1124
1125   if (editor->bCaretAtEnd && !pCursor->nOffset)
1126     return;
1127
1128   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1129   assert(pRow);
1130   if (pRow->type == diStartRow) {
1131     /* FIXME WTF was I thinking about here ? */
1132     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1133     assert(pRun);
1134     pCursor->pRun = pRun;
1135     pCursor->nOffset = 0;
1136     editor->bCaretAtEnd = 1;
1137     return;
1138   }
1139   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1140   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1141   pCursor->nOffset = 0;
1142   editor->bCaretAtEnd = FALSE;
1143 }
1144
1145 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1146 {
1147   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1148   assert(p);
1149   p = ME_FindItemBack(p, diRun);
1150   assert(p);
1151   assert(p->member.run.nFlags & MERF_ENDPARA);
1152   pCursor->pRun = p;
1153   pCursor->nOffset = 0;
1154   editor->bCaretAtEnd = FALSE;
1155 }
1156
1157 BOOL ME_IsSelection(ME_TextEditor *editor)
1158 {
1159   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1160 }
1161
1162 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1163 {
1164   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1165
1166   if (cdir*dir>0)
1167     return 0;
1168   else
1169     return 1;
1170 }
1171
1172 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1173 {
1174   ME_Cursor old_anchor = editor->pCursors[1];
1175
1176   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1177   {
1178     /* any selection was present ? if so, it's no more, repaint ! */
1179     editor->pCursors[1] = editor->pCursors[0];
1180     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1181       return TRUE;
1182     }
1183     return FALSE;
1184   }
1185   else
1186   {
1187     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1188     {
1189       editor->pCursors[1] = *pTempCursor;
1190       return TRUE;
1191     }
1192   }
1193
1194   ME_Repaint(editor);
1195   return TRUE;
1196 }
1197
1198 void ME_DeleteSelection(ME_TextEditor *editor)
1199 {
1200   int from, to;
1201   ME_GetSelection(editor, &from, &to);
1202   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1203 }
1204
1205 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1206 {
1207   ME_Style *style;
1208   int from, to;
1209   ME_Cursor c;
1210
1211   ME_GetSelection(editor, &from, &to);
1212   ME_CursorFromCharOfs(editor, from, &c);
1213   if (from != to) {
1214     style = c.pRun->member.run.style;
1215     ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
1216   }
1217   else
1218     style = ME_GetInsertStyle(editor, 0);
1219   return style;
1220 }
1221
1222 void ME_SendSelChange(ME_TextEditor *editor)
1223 {
1224   SELCHANGE sc;
1225
1226   ME_ClearTempStyle(editor);
1227
1228   if (!(editor->nEventMask & ENM_SELCHANGE))
1229     return;
1230
1231   sc.nmhdr.hwndFrom = editor->hWnd;
1232   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1233   sc.nmhdr.code = EN_SELCHANGE;
1234   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1235   sc.seltyp = SEL_EMPTY;
1236   if (sc.chrg.cpMin != sc.chrg.cpMax)
1237     sc.seltyp |= SEL_TEXT;
1238   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1239     sc.seltyp |= SEL_MULTICHAR;
1240   SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1241 }
1242
1243
1244 BOOL
1245 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1246 {
1247   int nCursor = 0;
1248   ME_Cursor *p = &editor->pCursors[nCursor];
1249   ME_Cursor tmp_curs = *p;
1250   BOOL success = FALSE;
1251
1252   ME_CheckCharOffsets(editor);
1253   editor->nUDArrowX = -1;
1254   switch(nVKey) {
1255     case VK_LEFT:
1256       editor->bCaretAtEnd = 0;
1257       if (ctrl)
1258         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1259       else
1260         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1261       break;
1262     case VK_RIGHT:
1263       editor->bCaretAtEnd = 0;
1264       if (ctrl)
1265         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1266       else
1267         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1268       break;
1269     case VK_UP:
1270       ME_MoveCursorLines(editor, &tmp_curs, -1);
1271       break;
1272     case VK_DOWN:
1273       ME_MoveCursorLines(editor, &tmp_curs, +1);
1274       break;
1275     case VK_PRIOR:
1276       ME_ArrowPageUp(editor, &tmp_curs);
1277       break;
1278     case VK_NEXT:
1279       ME_ArrowPageDown(editor, &tmp_curs);
1280       break;
1281     case VK_HOME: {
1282       if (ctrl)
1283         ME_ArrowCtrlHome(editor, &tmp_curs);
1284       else
1285         ME_ArrowHome(editor, &tmp_curs);
1286       editor->bCaretAtEnd = 0;
1287       break;
1288     }
1289     case VK_END:
1290       if (ctrl)
1291         ME_ArrowCtrlEnd(editor, &tmp_curs);
1292       else
1293         ME_ArrowEnd(editor, &tmp_curs);
1294       break;
1295   }
1296
1297   if (!extend)
1298     editor->pCursors[1] = tmp_curs;
1299   *p = tmp_curs;
1300
1301   ME_InvalidateSelection(editor);
1302   ME_Repaint(editor);
1303   HideCaret(editor->hWnd);
1304   ME_EnsureVisible(editor, tmp_curs.pRun);
1305   ME_ShowCaret(editor);
1306   ME_SendSelChange(editor);
1307   return success;
1308 }