reactos/dll/win32/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 void ME_GetSelection(ME_TextEditor *editor, int *from, int *to)
  31 {
  32   *from = ME_GetCursorOfs(editor, 0);
  33   *to =   ME_GetCursorOfs(editor, 1);
  34
  35   if (*from > *to)
  36   {
  37     int tmp = *from;
  38     *from = *to;
  39     *to = tmp;
  40   }
  41 }
  42
  43 int ME_GetTextLength(ME_TextEditor *editor)
  44 {
  45   return ME_CharOfsFromRunOfs(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun), 0);
  46 }
  47
  48
  49 int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
  50 {
  51   int length;
  52
  53   if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
  54     return E_INVALIDARG;
  55   if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
  56     return E_INVALIDARG;
  57
  58   length = ME_GetTextLength(editor);
  59
  60   if ((GetWindowLongW(editor->hWnd, GWL_STYLE) & ES_MULTILINE)
  61         && (how->flags & GTL_USECRLF)
  62         && !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
  63     length += editor->nParagraphs - 1;
  64
  65   if (how->flags & GTL_NUMBYTES)
  66   {
  67     CPINFO cpinfo;
  68
  69     if (how->codepage == 1200)
  70       return length * 2;
  71     if (how->flags & GTL_PRECISE)
  72       FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
  73     if (GetCPInfo(how->codepage, &cpinfo))
  74       return length * cpinfo.MaxCharSize;
  75     ERR("Invalid codepage %u\n", how->codepage);
  76     return E_INVALIDARG;
  77   }
  78   return length;
  79 }
  80
  81
  82 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
  83 {
  84   int selectionEnd = 0;
  85   const int len = ME_GetTextLength(editor);
  86
  87   /* all negative values are effectively the same */
  88   if (from < 0)
  89     from = -1;
  90   if (to < 0)
  91     to = -1;
  92
  93   /* select all */
  94   if (from == 0 && to == -1)
  95   {
  96     editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
  97     editor->pCursors[1].nOffset = 0;
  98     editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  99     editor->pCursors[0].nOffset = 0;
 100     ME_InvalidateSelection(editor);
 101     ME_ClearTempStyle(editor);
 102     return len + 1;
 103   }
 104
 105   /* if both values are equal and also out of bound, that means to */
 106   /* put the selection at the end of the text */
 107   if ((from == to) && (to < 0 || to > len))
 108   {
 109     selectionEnd = 1;
 110   }
 111   else
 112   {
 113     /* if from is negative and to is positive then selection is */
 114     /* deselected and caret moved to end of the current selection */
 115     if (from < 0)
 116     {
 117       int start, end;
 118       ME_GetSelection(editor, &start, &end);
 119       editor->pCursors[1] = editor->pCursors[0];
 120       ME_Repaint(editor);
 121       ME_ClearTempStyle(editor);
 122       return end;
 123     }
 124
 125     /* adjust to if it's a negative value */
 126     if (to < 0)
 127       to = len + 1;
 128
 129     /* flip from and to if they are reversed */
 130     if (from>to)
 131     {
 132       int tmp = from;
 133       from = to;
 134       to = tmp;
 135     }
 136
 137     /* after fiddling with the values, we find from > len && to > len */
 138     if (from > len)
 139       selectionEnd = 1;
 140     /* special case with to too big */
 141     else if (to > len)
 142       to = len + 1;
 143   }
 144
 145   if (selectionEnd)
 146   {
 147     editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 148     editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
 149     ME_InvalidateSelection(editor);
 150     ME_ClearTempStyle(editor);
 151     return len;
 152   }
 153
 154   ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
 155   ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
 156   return to;
 157 }
 158
 159
 160 void
 161 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
 162                         int *x, int *y, int *height)
 163 {
 164   ME_DisplayItem *pCursorRun = pCursor->pRun;
 165   ME_DisplayItem *pSizeRun = pCursor->pRun;
 166
 167   assert(!pCursor->nOffset || !editor->bCaretAtEnd);
 168   assert(height && x && y);
 169   assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
 170   assert(pCursor->pRun);
 171   assert(pCursor->pRun->type == diRun);
 172
 173   if (pCursorRun->type == diRun) {
 174     ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
 175
 176     if (row) {
 177       HDC hDC = GetDC(editor->hWnd);
 178       ME_Context c;
 179       ME_DisplayItem *run = pCursorRun;
 180       ME_DisplayItem *para = NULL;
 181       SIZE sz = {0, 0};
 182
 183       ME_InitContext(&c, editor, hDC);
 184
 185       if (!pCursor->nOffset && !editor->bCaretAtEnd)
 186       {
 187         ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrStartRow);
 188         assert(prev);
 189         if (prev->type == diRun)
 190           pSizeRun = prev;
 191       }
 192       assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
 193       para = ME_FindItemBack(row, diParagraph);
 194       assert(para);
 195       assert(para->type == diParagraph);
 196       if (editor->bCaretAtEnd && !pCursor->nOffset &&
 197           run == ME_FindItemFwd(row, diRun))
 198       {
 199         ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
 200         assert(tmp);
 201         if (tmp->type == diRun)
 202         {
 203           row = ME_FindItemBack(tmp, diStartRow);
 204           pSizeRun = run = tmp;
 205           assert(run);
 206           assert(run->type == diRun);
 207           sz = ME_GetRunSize(&c, &para->member.para,
 208                              &run->member.run, ME_StrLen(run->member.run.strText),
 209                              row->member.row.nLMargin);
 210         }
 211       }
 212       if (pCursor->nOffset && !(run->member.run.nFlags & MERF_SKIPPED)) {
 213         sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset,
 214                            row->member.row.nLMargin);
 215       }
 216
 217       *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
 218       *x = run->member.run.pt.x + sz.cx;
 219       *y = para->member.para.nYPos + row->member.row.nBaseline + pSizeRun->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
 220
 221       ME_DestroyContext(&c, editor->hWnd);
 222       return;
 223     }
 224   }
 225   *height = 10; /* FIXME use global font */
 226   *x = 0;
 227   *y = 0;
 228 }
 229
 230
 231 void
 232 ME_MoveCaret(ME_TextEditor *editor)
 233 {
 234   int x, y, height;
 235
 236   if (ME_WrapMarkedParagraphs(editor))
 237     ME_UpdateScrollBar(editor);
 238   ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
 239   if(editor->bHaveFocus)
 240   {
 241     CreateCaret(editor->hWnd, NULL, 0, height);
 242     SetCaretPos(x, y);
 243   }
 244 }
 245
 246
 247 void ME_ShowCaret(ME_TextEditor *ed)
 248 {
 249   ME_MoveCaret(ed);
 250   if(ed->bHaveFocus)
 251     ShowCaret(ed->hWnd);
 252 }
 253
 254 void ME_HideCaret(ME_TextEditor *ed)
 255 {
 256   if(ed->bHaveFocus)
 257   {
 258     HideCaret(ed->hWnd);
 259     DestroyCaret();
 260   }
 261 }
 262
 263 void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
 264   int nChars)
 265 {
 266   ME_Cursor c;
 267   int shift = 0;
 268
 269   while(nChars > 0)
 270   {
 271     ME_Run *run;
 272     ME_CursorFromCharOfs(editor, nOfs, &c);
 273     run = &c.pRun->member.run;
 274     if (run->nFlags & MERF_ENDPARA) {
 275       int eollen = run->nCR + run->nLF;
 276
 277       if (!ME_FindItemFwd(c.pRun, diParagraph))
 278       {
 279         return;
 280       }
 281       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 282       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 283       ME_CheckCharOffsets(editor);
 284       nChars -= (eollen < nChars) ? eollen : nChars;
 285       continue;
 286     }
 287     else
 288     {
 289       ME_Cursor cursor;
 290       int nIntendedChars = nChars;
 291       int nCharsToDelete = nChars;
 292       int i;
 293       int loc = c.nOffset;
 294
 295       ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
 296
 297       cursor = c;
 298       ME_StrRelPos(run->strText, loc, &nChars);
 299       /* nChars is the number of characters that should be deleted from the
 300          FOLLOWING runs (these AFTER cursor.pRun)
 301          nCharsToDelete is a number of chars to delete from THIS run */
 302       nCharsToDelete -= nChars;
 303       shift -= nCharsToDelete;
 304       TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
 305         nCharsToDelete, nIntendedChars, nChars, c.nOffset,
 306         debugstr_w(run->strText->szData), run->strText->nLen);
 307
 308       if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
 309       {
 310         /* undo = reinsert whole run */
 311         /* nOfs is a character offset (from the start of the document
 312            to the current (deleted) run */
 313         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 314         if (pUndo)
 315           pUndo->di.member.run.nCharOfs = nOfs;
 316       }
 317       else
 318       {
 319         /* undo = reinsert partial run */
 320         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 321         if (pUndo) {
 322           ME_DestroyString(pUndo->di.member.run.strText);
 323           pUndo->di.member.run.nCharOfs = nOfs;
 324           pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
 325         }
 326       }
 327       TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
 328       TRACE("Shift value: %d\n", shift);
 329       ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
 330
 331       /* update cursors (including c) */
 332       for (i=-1; i<editor->nCursors; i++) {
 333         ME_Cursor *pThisCur = editor->pCursors + i;
 334         if (i == -1) pThisCur = &c;
 335         if (pThisCur->pRun == cursor.pRun) {
 336           if (pThisCur->nOffset > cursor.nOffset) {
 337             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 338               pThisCur->nOffset = cursor.nOffset;
 339             else
 340               pThisCur->nOffset -= nCharsToDelete;
 341             assert(pThisCur->nOffset >= 0);
 342             assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
 343           }
 344           if (pThisCur->nOffset == ME_StrVLen(run->strText))
 345           {
 346             pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
 347             assert(pThisCur->pRun->type == diRun);
 348             pThisCur->nOffset = 0;
 349           }
 350         }
 351       }
 352
 353       /* c = updated data now */
 354
 355       if (c.pRun == cursor.pRun)
 356         ME_SkipAndPropagateCharOffset(c.pRun, shift);
 357       else
 358         ME_PropagateCharOffset(c.pRun, shift);
 359
 360       if (!ME_StrVLen(cursor.pRun->member.run.strText))
 361       {
 362         TRACE("Removing useless run\n");
 363         ME_Remove(cursor.pRun);
 364         ME_DestroyDisplayItem(cursor.pRun);
 365       }
 366
 367       shift = 0;
 368       /*
 369       ME_CheckCharOffsets(editor);
 370       */
 371       continue;
 372     }
 373   }
 374 }
 375
 376 void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
 377   int nChars)
 378 {
 379   assert(nCursor>=0 && nCursor<editor->nCursors);
 380   /* text operations set modified state */
 381   editor->nModifyStep = 1;
 382   ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
 383 }
 384
 385 static ME_DisplayItem *
 386 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 387                                 const WCHAR *str, int len, ME_Style *style,
 388                                 int flags)
 389 {
 390   ME_Cursor *p = &editor->pCursors[nCursor];
 391
 392   editor->bCaretAtEnd = FALSE;
 393
 394   assert(p->pRun->type == diRun);
 395
 396   return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
 397 }
 398
 399
 400 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
 401 {
 402   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 403   ME_DisplayItem        *di;
 404   WCHAR                 space = ' ';
 405
 406   /* FIXME no no no */
 407   if (ME_IsSelection(editor))
 408     ME_DeleteSelection(editor);
 409
 410   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 411                                        MERF_GRAPHICS);
 412   di->member.run.ole_obj = ALLOC_OBJ(*reo);
 413   ME_CopyReObject(di->member.run.ole_obj, reo);
 414   ME_SendSelChange(editor);
 415 }
 416
 417
 418 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
 419 {
 420   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 421   ME_DisplayItem        *di;
 422   WCHAR                 space = ' ';
 423
 424   /* FIXME no no no */
 425   if (ME_IsSelection(editor))
 426     ME_DeleteSelection(editor);
 427
 428   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 429                                        MERF_ENDROW);
 430   ME_SendSelChange(editor);
 431 }
 432
 433 void
 434 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 435 {
 436   WCHAR tab = '\t';
 437   ME_DisplayItem *p, *run;
 438   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 439
 440   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 441                                       MERF_CELL);
 442   run = p;
 443   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 444   {
 445     if (run->member.run.nFlags & MERF_CELL)
 446     {
 447       assert(run->member.run.pCell->next);
 448       p->member.run.pCell = run->member.run.pCell->next;
 449       return;
 450     }
 451   }
 452   assert(run->type == diParagraph);
 453   assert(run->member.para.bTable);
 454   assert(run->member.para.pCells);
 455   p->member.run.pCell = run->member.para.pCells;
 456 }
 457
 458
 459 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 460   const WCHAR *str, int len, ME_Style *style)
 461 {
 462   const WCHAR *pos;
 463   ME_Cursor *p = NULL;
 464   int oldLen;
 465
 466   /* FIXME really HERE ? */
 467   if (ME_IsSelection(editor))
 468     ME_DeleteSelection(editor);
 469
 470   /* FIXME: is this too slow? */
 471   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 472   oldLen = ME_GetTextLength(editor);
 473
 474   /* text operations set modified state */
 475   editor->nModifyStep = 1;
 476
 477   assert(style);
 478
 479   assert(nCursor>=0 && nCursor<editor->nCursors);
 480   if (len == -1)
 481     len = lstrlenW(str);
 482
 483   /* grow the text limit to fit our text */
 484   if(editor->nTextLimit < oldLen +len)
 485     editor->nTextLimit = oldLen + len;
 486
 487   while (len)
 488   {
 489     pos = str;
 490     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 491     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 492       pos++;
 493     if (pos-str < len && *pos == '\t') { /* handle tabs */
 494       WCHAR tab = '\t';
 495
 496       if (pos!=str)
 497         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 498
 499       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 500
 501       pos++;
 502       if(pos-str <= len) {
 503         len -= pos - str;
 504         str = pos;
 505         continue;
 506       }
 507     }
 508     /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 509     if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
 510       WCHAR space = ' ';
 511
 512       if (pos!=str)
 513         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 514
 515       ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
 516
 517       pos+=3;
 518       if(pos-str <= len) {
 519         len -= pos - str;
 520         str = pos;
 521         continue;
 522       }
 523     }
 524     if (pos-str < len) {   /* handle EOLs */
 525       ME_DisplayItem *tp, *end_run;
 526       ME_Style *tmp_style;
 527       int numCR, numLF;
 528
 529       if (pos!=str)
 530         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 531       p = &editor->pCursors[nCursor];
 532       if (p->nOffset) {
 533         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 534         p = &editor->pCursors[nCursor];
 535       }
 536       tmp_style = ME_GetInsertStyle(editor, nCursor);
 537       /* ME_SplitParagraph increases style refcount */
 538
 539       /* Encode and fill number of CR and LF according to emulation mode */
 540       if (editor->bEmulateVersion10) {
 541         const WCHAR * tpos;
 542
 543         /* We have to find out how many consecutive \r are there, and if there
 544            is a \n terminating the run of \r's. */
 545         numCR = 0; numLF = 0;
 546         tpos = pos;
 547         while (tpos-str < len && *tpos == '\r') {
 548           tpos++;
 549           numCR++;
 550         }
 551         if (tpos-str >= len) {
 552           /* Reached end of text without finding anything but '\r' */
 553           if (tpos != pos) {
 554             pos++;
 555           }
 556           numCR = 1; numLF = 0;
 557         } else if (*tpos == '\n') {
 558           /* The entire run of \r's plus the one \n is one single line break */
 559           pos = tpos + 1;
 560           numLF = 1;
 561         } else {
 562           /* Found some other content past the run of \r's */
 563           pos++;
 564           numCR = 1; numLF = 0;
 565         }
 566       } else {
 567         if(pos-str < len && *pos =='\r')
 568           pos++;
 569         if(pos-str < len && *pos =='\n')
 570           pos++;
 571         numCR = 1; numLF = 0;
 572       }
 573       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, numCR, numLF);
 574       p->pRun = ME_FindItemFwd(tp, diRun);
 575       end_run = ME_FindItemBack(tp, diRun);
 576       ME_ReleaseStyle(end_run->member.run.style);
 577       end_run->member.run.style = tmp_style;
 578       p->nOffset = 0;
 579
 580       if(pos-str <= len) {
 581         len -= pos - str;
 582         str = pos;
 583         continue;
 584       }
 585     }
 586     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 587     len = 0;
 588   }
 589 }
 590
 591
 592 static BOOL
 593 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 594 {
 595   ME_DisplayItem *pRun = pCursor->pRun;
 596
 597   if (nRelOfs == -1)
 598   {
 599     if (!pCursor->nOffset)
 600     {
 601       do {
 602         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 603         assert(pRun);
 604         switch (pRun->type)
 605         {
 606           case diRun:
 607             break;
 608           case diParagraph:
 609             if (pRun->member.para.prev_para->type == diTextStart)
 610               return FALSE;
 611             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 612             /* every paragraph ought to have at least one run */
 613             assert(pRun && pRun->type == diRun);
 614             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 615             break;
 616           default:
 617             assert(pRun->type != diRun && pRun->type != diParagraph);
 618             return FALSE;
 619         }
 620       } while (RUN_IS_HIDDEN(&pRun->member.run));
 621       pCursor->pRun = pRun;
 622       if (pRun->member.run.nFlags & MERF_ENDPARA)
 623         pCursor->nOffset = 0;
 624       else
 625         pCursor->nOffset = pRun->member.run.strText->nLen;
 626     }
 627
 628     if (pCursor->nOffset)
 629       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 630     return TRUE;
 631   }
 632   else
 633   {
 634     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 635     {
 636       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 637
 638       if (new_ofs < pRun->member.run.strText->nLen)
 639       {
 640         pCursor->nOffset = new_ofs;
 641         return TRUE;
 642       }
 643     }
 644     do {
 645       pRun = ME_FindItemFwd(pRun, diRun);
 646     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 647     if (pRun)
 648     {
 649       pCursor->pRun = pRun;
 650       pCursor->nOffset = 0;
 651       return TRUE;
 652     }
 653   }
 654   return FALSE;
 655 }
 656
 657
 658 static BOOL
 659 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 660 {
 661   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 662   int nOffset = cursor->nOffset;
 663
 664   if (nRelOfs == -1)
 665   {
 666     /* Backward movement */
 667     while (TRUE)
 668     {
 669       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 670                                      nOffset, WB_MOVEWORDLEFT);
 671        if (nOffset)
 672         break;
 673       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 674       if (pOtherRun->type == diRun)
 675       {
 676         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 677                                  pOtherRun->member.run.strText->nLen - 1,
 678                                  WB_ISDELIMITER)
 679             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 680             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 681             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 682                                      WB_ISDELIMITER))
 683           break;
 684         pRun = pOtherRun;
 685         nOffset = pOtherRun->member.run.strText->nLen;
 686       }
 687       else if (pOtherRun->type == diParagraph)
 688       {
 689         if (cursor->pRun == pRun && cursor->nOffset == 0)
 690         {
 691           /* Paragraph breaks are treated as separate words */
 692           if (pOtherRun->member.para.prev_para->type == diTextStart)
 693             return FALSE;
 694           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 695         }
 696         break;
 697       }
 698     }
 699   }
 700   else
 701   {
 702     /* Forward movement */
 703     BOOL last_delim = FALSE;
 704
 705     while (TRUE)
 706     {
 707       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 708                                               nOffset, WB_ISDELIMITER))
 709         break;
 710       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 711                                      nOffset, WB_MOVEWORDRIGHT);
 712       if (nOffset < pRun->member.run.strText->nLen)
 713         break;
 714       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 715       if (pOtherRun->type == diRun)
 716       {
 717         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 718                                           nOffset - 1, WB_ISDELIMITER);
 719         pRun = pOtherRun;
 720         nOffset = 0;
 721       }
 722       else if (pOtherRun->type == diParagraph)
 723       {
 724         if (cursor->pRun == pRun)
 725           pRun = ME_FindItemFwd(pOtherRun, diRun);
 726         nOffset = 0;
 727         break;
 728       }
 729       else /* diTextEnd */
 730       {
 731         if (cursor->pRun == pRun)
 732           return FALSE;
 733         nOffset = 0;
 734         break;
 735       }
 736     }
 737   }
 738   cursor->pRun = pRun;
 739   cursor->nOffset = nOffset;
 740   return TRUE;
 741 }
 742
 743
 744 void
 745 ME_SelectWord(ME_TextEditor *editor)
 746 {
 747   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 748     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 749   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 750   ME_InvalidateSelection(editor);
 751   ME_SendSelChange(editor);
 752 }
 753
 754
 755 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 756 {
 757   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 758   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 759     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 760 }
 761
 762 static void ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 763 {
 764   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 765   ME_DisplayItem *last = NULL;
 766   int rx = 0;
 767
 768   if (is_eol)
 769     *is_eol = 0;
 770
 771   /* find paragraph */
 772   for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
 773   {
 774     assert(p->type == diParagraph);
 775     if (y < p->member.para.nYPos + p->member.para.nHeight)
 776     {
 777       y -= p->member.para.nYPos;
 778       p = ME_FindItemFwd(p, diStartRow);
 779       break;
 780     }
 781   }
 782   /* find row */
 783   for (; p != editor->pBuffer->pLast; )
 784   {
 785     ME_DisplayItem *pp;
 786     assert(p->type == diStartRow);
 787     if (y < p->member.row.nYPos + p->member.row.nHeight)
 788     {
 789         p = ME_FindItemFwd(p, diRun);
 790         break;
 791     }
 792     pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 793     if (pp->type != diStartRow)
 794     {
 795         p = ME_FindItemFwd(p, diRun);
 796         break;
 797     }
 798     p = pp;
 799   }
 800   for (; p != editor->pBuffer->pLast; p = p->next)
 801   {
 802     switch (p->type)
 803     {
 804     case diRun:
 805       rx = x - p->member.run.pt.x;
 806       if (rx < p->member.run.nWidth)
 807       {
 808       found_here:
 809         assert(p->type == diRun);
 810         if ((p->member.run.nFlags & MERF_ENDPARA) || rx < 0)
 811           rx = 0;
 812         result->pRun = p;
 813         result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 814         if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 815         {
 816           result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 817           result->nOffset = 0;
 818         }
 819         return;
 820       }
 821       break;
 822     case diStartRow:
 823       p = ME_FindItemFwd(p, diRun);
 824       if (is_eol) *is_eol = 1;
 825       rx = 0; /* FIXME not sure */
 826       goto found_here;
 827     case diParagraph:
 828     case diTextEnd:
 829       rx = 0; /* FIXME not sure */
 830       p = last;
 831       goto found_here;
 832     default: assert(0);
 833     }
 834     last = p;
 835   }
 836   result->pRun = ME_FindItemBack(p, diRun);
 837   result->nOffset = 0;
 838   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 839 }
 840
 841
 842 int
 843 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 844 {
 845   ME_Cursor cursor;
 846   RECT rc;
 847
 848   GetClientRect(editor->hWnd, &rc);
 849   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 850     return -1;
 851   y += ME_GetYScrollPos(editor);
 852   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 853   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 854           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 855 }
 856
 857
 858 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 859 {
 860   ME_Cursor tmp_cursor;
 861   int is_selection = 0;
 862
 863   editor->nUDArrowX = -1;
 864
 865   y += ME_GetYScrollPos(editor);
 866
 867   tmp_cursor = editor->pCursors[0];
 868   is_selection = ME_IsSelection(editor);
 869
 870   if (x >= editor->selofs)
 871   {
 872     ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 873     if (GetKeyState(VK_SHIFT)>=0)
 874     {
 875       editor->pCursors[1] = editor->pCursors[0];
 876     }
 877     else if (!is_selection) {
 878       editor->pCursors[1] = tmp_cursor;
 879       is_selection = 1;
 880     }
 881
 882     ME_InvalidateSelection(editor);
 883     HideCaret(editor->hWnd);
 884     ME_MoveCaret(editor);
 885     ShowCaret(editor->hWnd);
 886     ME_ClearTempStyle(editor);
 887     ME_SendSelChange(editor);
 888   }
 889   else
 890   {
 891     ME_DisplayItem *pRow;
 892
 893     editor->linesel = 1;
 894     editor->sely = y;
 895     /* Set pCursors[0] to beginning of line */
 896     ME_FindPixelPos(editor, x, y, &editor->pCursors[1], &editor->bCaretAtEnd);
 897     /* Set pCursors[1] to end of line */
 898     pRow = ME_FindItemFwd(editor->pCursors[1].pRun, diStartRowOrParagraphOrEnd);
 899     assert(pRow);
 900     /* pCursor[0] is the position where the cursor will be drawn,
 901      * pCursor[1] is the other end of the selection range
 902      * pCursor[2] and [3] are backups of [0] and [1] so I
 903      * don't have to look them up again
 904      */
 905
 906     if (pRow->type == diStartRow) {
 907       /* FIXME WTF was I thinking about here ? */
 908       ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
 909       assert(pRun);
 910       editor->pCursors[0].pRun = pRun;
 911       editor->pCursors[0].nOffset = 0;
 912       editor->bCaretAtEnd = 1;
 913     } else {
 914       editor->pCursors[0].pRun = ME_FindItemBack(pRow, diRun);
 915       assert(editor->pCursors[0].pRun && editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA);
 916       editor->pCursors[0].nOffset = 0;
 917       editor->bCaretAtEnd = 0;
 918     }
 919     editor->pCursors[2] = editor->pCursors[0];
 920     editor->pCursors[3] = editor->pCursors[1];
 921     ME_InvalidateSelection(editor);
 922     HideCaret(editor->hWnd);
 923     ME_MoveCaret(editor);
 924     ShowCaret(editor->hWnd);
 925     ME_ClearTempStyle(editor);
 926     ME_SendSelChange(editor);
 927   }
 928 }
 929
 930 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 931 {
 932   ME_Cursor tmp_cursor;
 933
 934   y += ME_GetYScrollPos(editor);
 935
 936   tmp_cursor = editor->pCursors[0];
 937   /* FIXME: do something with the return value of ME_FindPixelPos */
 938   if (!editor->linesel)
 939     ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 940   else ME_FindPixelPos(editor, (y > editor->sely) * editor->rcFormat.right, y, &tmp_cursor, &editor->bCaretAtEnd);
 941
 942   if (!memcmp(&tmp_cursor, editor->pCursors, sizeof(tmp_cursor)))
 943     return;
 944
 945   ME_InvalidateSelection(editor);
 946   if (!editor->linesel)
 947     editor->pCursors[0] = tmp_cursor;
 948   else if (!memcmp(&tmp_cursor, editor->pCursors+2, sizeof(tmp_cursor)) ||
 949            !memcmp(&tmp_cursor, editor->pCursors+3, sizeof(tmp_cursor)))
 950   {
 951     editor->pCursors[0] = editor->pCursors[2];
 952     editor->pCursors[1] = editor->pCursors[3];
 953   }
 954   else if (y < editor->sely)
 955   {
 956     editor->pCursors[0] = tmp_cursor;
 957     editor->pCursors[1] = editor->pCursors[2];
 958   }
 959   else
 960   {
 961     editor->pCursors[0] = tmp_cursor;
 962     editor->pCursors[1] = editor->pCursors[3];
 963   }
 964
 965   HideCaret(editor->hWnd);
 966   ME_MoveCaret(editor);
 967   ME_InvalidateSelection(editor);
 968   ShowCaret(editor->hWnd);
 969   ME_SendSelChange(editor);
 970 }
 971
 972 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 973                                 int x, int *pOffset, int *pbCaretAtEnd)
 974 {
 975   ME_DisplayItem *pNext, *pLastRun;
 976   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 977   assert(pNext->type == diRun);
 978   pLastRun = pNext;
 979   *pbCaretAtEnd = FALSE;
 980   do {
 981     int run_x = pNext->member.run.pt.x;
 982     int width = pNext->member.run.nWidth;
 983     if (x < run_x)
 984     {
 985       if (pOffset) *pOffset = 0;
 986       return pNext;
 987     }
 988     if (x >= run_x && x < run_x+width)
 989     {
 990       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 991       ME_String *s = pNext->member.run.strText;
 992       if (ch < s->nLen) {
 993         if (pOffset)
 994           *pOffset = ch;
 995         return pNext;
 996       }
 997     }
 998     pLastRun = pNext;
 999     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
1000   } while(pNext && pNext->type == diRun);
1001
1002   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
1003   {
1004     pNext = ME_FindItemFwd(pNext, diRun);
1005     if (pbCaretAtEnd) *pbCaretAtEnd = 1;
1006     if (pOffset) *pOffset = 0;
1007     return pNext;
1008   } else {
1009     if (pbCaretAtEnd) *pbCaretAtEnd = 0;
1010     if (pOffset) *pOffset = 0;
1011     return pLastRun;
1012   }
1013 }
1014
1015 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1016 {
1017   ME_DisplayItem *pRun = pCursor->pRun;
1018   int x;
1019
1020   if (editor->nUDArrowX != -1)
1021     x = editor->nUDArrowX;
1022   else {
1023     if (editor->bCaretAtEnd)
1024     {
1025       pRun = ME_FindItemBack(pRun, diRun);
1026       assert(pRun);
1027       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1028     }
1029     else {
1030       x = pRun->member.run.pt.x;
1031       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
1032     }
1033     editor->nUDArrowX = x;
1034   }
1035   return x;
1036 }
1037
1038
1039 static void
1040 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1041 {
1042   ME_DisplayItem *pRun = pCursor->pRun;
1043   ME_DisplayItem *pItem;
1044   int x = ME_GetXForArrow(editor, pCursor);
1045
1046   if (editor->bCaretAtEnd && !pCursor->nOffset)
1047     pRun = ME_FindItemBack(pRun, diRun);
1048   if (!pRun)
1049     return;
1050   if (nRelOfs == -1)
1051   {
1052     /* start of this row */
1053     pItem = ME_FindItemBack(pRun, diStartRow);
1054     assert(pItem);
1055     /* start of the previous row */
1056     pItem = ME_FindItemBack(pItem, diStartRow);
1057   }
1058   else
1059   {
1060     /* start of the next row */
1061     pItem = ME_FindItemFwd(pRun, diStartRow);
1062     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
1063     */
1064   }
1065   if (!pItem)
1066   {
1067     /* row not found - ignore */
1068     return;
1069   }
1070   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1071   assert(pCursor->pRun);
1072   assert(pCursor->pRun->type == diRun);
1073 }
1074
1075
1076 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1077 {
1078   ME_DisplayItem *pRun = pCursor->pRun;
1079   ME_DisplayItem *pLast, *p;
1080   int x, y, ys, yd, yp, yprev;
1081   ME_Cursor tmp_curs = *pCursor;
1082
1083   x = ME_GetXForArrow(editor, pCursor);
1084   if (!pCursor->nOffset && editor->bCaretAtEnd)
1085     pRun = ME_FindItemBack(pRun, diRun);
1086
1087   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1088   assert(p->type == diStartRow);
1089   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1090   yprev = ys = y = yp + p->member.row.nYPos;
1091   yd = y - editor->sizeWindow.cy;
1092   pLast = p;
1093
1094   do {
1095     p = ME_FindItemBack(p, diStartRowOrParagraph);
1096     if (!p)
1097       break;
1098     if (p->type == diParagraph) { /* crossing paragraphs */
1099       if (p->member.para.prev_para == NULL)
1100         break;
1101       yp = p->member.para.prev_para->member.para.nYPos;
1102       continue;
1103     }
1104     y = yp + p->member.row.nYPos;
1105     if (y < yd)
1106       break;
1107     pLast = p;
1108     yprev = y;
1109   } while(1);
1110
1111   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1112   ME_UpdateSelection(editor, &tmp_curs);
1113   if (yprev < editor->sizeWindow.cy)
1114   {
1115     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1116     ME_Repaint(editor);
1117   }
1118   else
1119   {
1120     ME_ScrollUp(editor, ys-yprev);
1121   }
1122   assert(pCursor->pRun);
1123   assert(pCursor->pRun->type == diRun);
1124 }
1125
1126 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1127    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1128    In such a situation, clicking the scrollbar restores its position back to the
1129    normal range (ie. sets it to (doclength-screenheight)). */
1130
1131 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1132 {
1133   ME_DisplayItem *pRun = pCursor->pRun;
1134   ME_DisplayItem *pLast, *p;
1135   int x, y, ys, yd, yp, yprev;
1136   ME_Cursor tmp_curs = *pCursor;
1137
1138   x = ME_GetXForArrow(editor, pCursor);
1139   if (!pCursor->nOffset && editor->bCaretAtEnd)
1140     pRun = ME_FindItemBack(pRun, diRun);
1141
1142   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1143   assert(p->type == diStartRow);
1144   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1145   yprev = ys = y = yp + p->member.row.nYPos;
1146   yd = y + editor->sizeWindow.cy;
1147   pLast = p;
1148
1149   do {
1150     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1151     if (!p)
1152       break;
1153     if (p->type == diParagraph) {
1154       yp = p->member.para.nYPos;
1155       continue;
1156     }
1157     y = yp + p->member.row.nYPos;
1158     if (y >= yd)
1159       break;
1160     pLast = p;
1161     yprev = y;
1162   } while(1);
1163
1164   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1165   ME_UpdateSelection(editor, &tmp_curs);
1166   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1167   {
1168     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1169     ME_Repaint(editor);
1170   }
1171   else
1172   {
1173     ME_ScrollUp(editor,ys-yprev);
1174   }
1175   assert(pCursor->pRun);
1176   assert(pCursor->pRun->type == diRun);
1177 }
1178
1179 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1180 {
1181   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1182   /* bCaretAtEnd doesn't make sense if the cursor isn't set at the
1183   first character of the next row */
1184   assert(!editor->bCaretAtEnd || !pCursor->nOffset);
1185   ME_WrapMarkedParagraphs(editor);
1186   if (pRow) {
1187     ME_DisplayItem *pRun;
1188     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1189       pRow = ME_FindItemBack(pRow, diStartRow);
1190       if (!pRow)
1191         return;
1192     }
1193     pRun = ME_FindItemFwd(pRow, diRun);
1194     if (pRun) {
1195       pCursor->pRun = pRun;
1196       pCursor->nOffset = 0;
1197     }
1198   }
1199   editor->bCaretAtEnd = FALSE;
1200 }
1201
1202 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1203 {
1204   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1205   if (pRow) {
1206     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1207     if (pRun) {
1208       pCursor->pRun = pRun;
1209       pCursor->nOffset = 0;
1210     }
1211   }
1212 }
1213
1214 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1215 {
1216   ME_DisplayItem *pRow;
1217
1218   if (editor->bCaretAtEnd && !pCursor->nOffset)
1219     return;
1220
1221   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1222   assert(pRow);
1223   if (pRow->type == diStartRow) {
1224     /* FIXME WTF was I thinking about here ? */
1225     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1226     assert(pRun);
1227     pCursor->pRun = pRun;
1228     pCursor->nOffset = 0;
1229     editor->bCaretAtEnd = 1;
1230     return;
1231   }
1232   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1233   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1234   pCursor->nOffset = 0;
1235   editor->bCaretAtEnd = FALSE;
1236 }
1237
1238 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1239 {
1240   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1241   assert(p);
1242   p = ME_FindItemBack(p, diRun);
1243   assert(p);
1244   assert(p->member.run.nFlags & MERF_ENDPARA);
1245   pCursor->pRun = p;
1246   pCursor->nOffset = 0;
1247   editor->bCaretAtEnd = FALSE;
1248 }
1249
1250 BOOL ME_IsSelection(ME_TextEditor *editor)
1251 {
1252   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1253 }
1254
1255 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1256 {
1257   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1258
1259   if (cdir*dir>0)
1260     return 0;
1261   else
1262     return 1;
1263 }
1264
1265 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1266 {
1267   ME_Cursor old_anchor = editor->pCursors[1];
1268
1269   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1270   {
1271     /* any selection was present ? if so, it's no more, repaint ! */
1272     editor->pCursors[1] = editor->pCursors[0];
1273     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1274       return TRUE;
1275     }
1276     return FALSE;
1277   }
1278   else
1279   {
1280     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1281     {
1282       editor->pCursors[1] = *pTempCursor;
1283       return TRUE;
1284     }
1285   }
1286
1287   ME_Repaint(editor);
1288   return TRUE;
1289 }
1290
1291 void ME_DeleteSelection(ME_TextEditor *editor)
1292 {
1293   int from, to;
1294   ME_GetSelection(editor, &from, &to);
1295   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1296 }
1297
1298 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1299 {
1300   ME_Style *style;
1301   int from, to;
1302
1303   ME_GetSelection(editor, &from, &to);
1304   if (from != to) {
1305     ME_Cursor c;
1306     ME_CursorFromCharOfs(editor, from, &c);
1307     style = c.pRun->member.run.style;
1308     ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
1309   }
1310   else
1311     style = ME_GetInsertStyle(editor, 0);
1312   return style;
1313 }
1314
1315 void ME_SendSelChange(ME_TextEditor *editor)
1316 {
1317   SELCHANGE sc;
1318
1319   ME_ClearTempStyle(editor);
1320
1321   if (!(editor->nEventMask & ENM_SELCHANGE))
1322     return;
1323
1324   sc.nmhdr.hwndFrom = editor->hWnd;
1325   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1326   sc.nmhdr.code = EN_SELCHANGE;
1327   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1328   sc.seltyp = SEL_EMPTY;
1329   if (sc.chrg.cpMin != sc.chrg.cpMax)
1330     sc.seltyp |= SEL_TEXT;
1331   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1332     sc.seltyp |= SEL_MULTICHAR;
1333   TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1334     sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1335     (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1336     (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1337   if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1338   {
1339     editor->notified_cr = sc.chrg;
1340     SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1341   }
1342 }
1343
1344 BOOL
1345 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1346 {
1347   int nCursor = 0;
1348   ME_Cursor *p = &editor->pCursors[nCursor];
1349   ME_Cursor tmp_curs = *p;
1350   BOOL success = FALSE;
1351
1352   ME_CheckCharOffsets(editor);
1353   editor->nUDArrowX = -1;
1354   switch(nVKey) {
1355     case VK_LEFT:
1356       editor->bCaretAtEnd = 0;
1357       if (ctrl)
1358         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1359       else
1360         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1361       break;
1362     case VK_RIGHT:
1363       editor->bCaretAtEnd = 0;
1364       if (ctrl)
1365         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1366       else
1367         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1368       break;
1369     case VK_UP:
1370       ME_MoveCursorLines(editor, &tmp_curs, -1);
1371       break;
1372     case VK_DOWN:
1373       ME_MoveCursorLines(editor, &tmp_curs, +1);
1374       break;
1375     case VK_PRIOR:
1376       ME_ArrowPageUp(editor, &tmp_curs);
1377       break;
1378     case VK_NEXT:
1379       ME_ArrowPageDown(editor, &tmp_curs);
1380       break;
1381     case VK_HOME: {
1382       if (ctrl)
1383         ME_ArrowCtrlHome(editor, &tmp_curs);
1384       else
1385         ME_ArrowHome(editor, &tmp_curs);
1386       editor->bCaretAtEnd = 0;
1387       break;
1388     }
1389     case VK_END:
1390       if (ctrl)
1391         ME_ArrowCtrlEnd(editor, &tmp_curs);
1392       else
1393         ME_ArrowEnd(editor, &tmp_curs);
1394       break;
1395   }
1396
1397   if (!extend)
1398     editor->pCursors[1] = tmp_curs;
1399   *p = tmp_curs;
1400
1401   ME_InvalidateSelection(editor);
1402   ME_Repaint(editor);
1403   HideCaret(editor->hWnd);
1404   ME_EnsureVisible(editor, tmp_curs.pRun);
1405   ME_ShowCaret(editor);
1406   ME_SendSelChange(editor);
1407   return success;
1408 }