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