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 /* FIXME this is temporary, just to have something to test how bad graphics handler is */
 397 void ME_InsertGraphicsFromCursor(ME_TextEditor *editor, int nCursor)
 398 {
 399   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 400   WCHAR space = ' ';
 401
 402   /* FIXME no no no */
 403   if (ME_IsSelection(editor))
 404     ME_DeleteSelection(editor);
 405
 406   ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 407                                   MERF_GRAPHICS);
 408   ME_SendSelChange(editor);
 409 }
 410
 411
 412 void
 413 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 414 {
 415   WCHAR tab = '\t';
 416   ME_DisplayItem *p, *run;
 417   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 418
 419   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 420                                       MERF_CELL);
 421   run = p;
 422   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 423   {
 424     if (run->member.run.nFlags & MERF_CELL)
 425     {
 426       assert(run->member.run.pCell->next);
 427       p->member.run.pCell = run->member.run.pCell->next;
 428       return;
 429     }
 430   }
 431   assert(run->type == diParagraph);
 432   assert(run->member.para.bTable);
 433   assert(run->member.para.pCells);
 434   p->member.run.pCell = run->member.para.pCells;
 435 }
 436
 437
 438 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 439   const WCHAR *str, int len, ME_Style *style)
 440 {
 441   const WCHAR *pos;
 442   ME_Cursor *p = NULL;
 443   int oldLen;
 444
 445   /* FIXME really HERE ? */
 446   if (ME_IsSelection(editor))
 447     ME_DeleteSelection(editor);
 448
 449   /* FIXME: is this too slow? */
 450   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 451   oldLen = ME_GetTextLength(editor);
 452
 453   /* text operations set modified state */
 454   editor->nModifyStep = 1;
 455
 456   assert(style);
 457
 458   assert(nCursor>=0 && nCursor<editor->nCursors);
 459   if (len == -1)
 460     len = lstrlenW(str);
 461
 462   /* grow the text limit to fit our text */
 463   if(editor->nTextLimit < oldLen +len)
 464     editor->nTextLimit = oldLen + len;
 465
 466   while (len)
 467   {
 468     pos = str;
 469     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 470     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 471       pos++;
 472     if (pos-str < len && *pos == '\t') { /* handle tabs */
 473       WCHAR tab = '\t';
 474
 475       if (pos!=str)
 476         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 477
 478       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 479
 480       pos++;
 481       if(pos-str <= len) {
 482         len -= pos - str;
 483         str = pos;
 484         continue;
 485       }
 486     }
 487     /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 488     if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
 489       WCHAR space = ' ';
 490
 491       if (pos!=str)
 492         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 493
 494       ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
 495
 496       pos+=3;
 497       if(pos-str <= len) {
 498         len -= pos - str;
 499         str = pos;
 500         continue;
 501       }
 502     }
 503     if (pos-str < len) {   /* handle EOLs */
 504       ME_DisplayItem *tp, *end_run;
 505       ME_Style *tmp_style;
 506       if (pos!=str)
 507         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 508       p = &editor->pCursors[nCursor];
 509       if (p->nOffset) {
 510         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 511         p = &editor->pCursors[nCursor];
 512       }
 513       tmp_style = ME_GetInsertStyle(editor, nCursor);
 514       /* ME_SplitParagraph increases style refcount */
 515       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style);
 516       p->pRun = ME_FindItemFwd(tp, diRun);
 517       end_run = ME_FindItemBack(tp, diRun);
 518       ME_ReleaseStyle(end_run->member.run.style);
 519       end_run->member.run.style = tmp_style;
 520       p->nOffset = 0;
 521       if(pos-str < len && *pos =='\r')
 522         pos++;
 523       if(pos-str < len && *pos =='\n')
 524         pos++;
 525       if(pos-str <= len) {
 526         len -= pos - str;
 527         str = pos;
 528         continue;
 529       }
 530     }
 531     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 532     len = 0;
 533   }
 534 }
 535
 536
 537 static BOOL
 538 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 539 {
 540   ME_DisplayItem *pRun = pCursor->pRun;
 541
 542   if (nRelOfs == -1)
 543   {
 544     if (!pCursor->nOffset)
 545     {
 546       do {
 547         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 548         assert(pRun);
 549         switch (pRun->type)
 550         {
 551           case diRun:
 552             break;
 553           case diParagraph:
 554             if (pRun->member.para.prev_para->type == diTextStart)
 555               return FALSE;
 556             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 557             /* every paragraph ought to have at least one run */
 558             assert(pRun && pRun->type == diRun);
 559             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 560             break;
 561           default:
 562             assert(pRun->type != diRun && pRun->type != diParagraph);
 563             return FALSE;
 564         }
 565       } while (RUN_IS_HIDDEN(&pRun->member.run));
 566       pCursor->pRun = pRun;
 567       if (pRun->member.run.nFlags & MERF_ENDPARA)
 568         pCursor->nOffset = 0;
 569       else
 570         pCursor->nOffset = pRun->member.run.strText->nLen;
 571     }
 572
 573     if (pCursor->nOffset)
 574       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 575     return TRUE;
 576   }
 577   else
 578   {
 579     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 580     {
 581       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 582
 583       if (new_ofs < pRun->member.run.strText->nLen)
 584       {
 585         pCursor->nOffset = new_ofs;
 586         return TRUE;
 587       }
 588     }
 589     do {
 590       pRun = ME_FindItemFwd(pRun, diRun);
 591     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 592     if (pRun)
 593     {
 594       pCursor->pRun = pRun;
 595       pCursor->nOffset = 0;
 596       return TRUE;
 597     }
 598   }
 599   return FALSE;
 600 }
 601
 602
 603 static BOOL
 604 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 605 {
 606   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 607   int nOffset = cursor->nOffset;
 608
 609   if (nRelOfs == -1)
 610   {
 611     /* Backward movement */
 612     while (TRUE)
 613     {
 614       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 615                                      nOffset, WB_MOVEWORDLEFT);
 616        if (nOffset)
 617         break;
 618       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 619       if (pOtherRun->type == diRun)
 620       {
 621         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 622                                  pOtherRun->member.run.strText->nLen - 1,
 623                                  WB_ISDELIMITER)
 624             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 625             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 626             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 627                                      WB_ISDELIMITER))
 628           break;
 629         pRun = pOtherRun;
 630         nOffset = pOtherRun->member.run.strText->nLen;
 631       }
 632       else if (pOtherRun->type == diParagraph)
 633       {
 634         if (cursor->pRun == pRun && cursor->nOffset == 0)
 635         {
 636           /* Paragraph breaks are treated as separate words */
 637           if (pOtherRun->member.para.prev_para->type == diTextStart)
 638             return FALSE;
 639           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 640         }
 641         break;
 642       }
 643     }
 644   }
 645   else
 646   {
 647     /* Forward movement */
 648     BOOL last_delim = FALSE;
 649
 650     while (TRUE)
 651     {
 652       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 653                                               nOffset, WB_ISDELIMITER))
 654         break;
 655       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 656                                      nOffset, WB_MOVEWORDRIGHT);
 657       if (nOffset < pRun->member.run.strText->nLen)
 658         break;
 659       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 660       if (pOtherRun->type == diRun)
 661       {
 662         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 663                                           nOffset - 1, WB_ISDELIMITER);
 664         pRun = pOtherRun;
 665         nOffset = 0;
 666       }
 667       else if (pOtherRun->type == diParagraph)
 668       {
 669         if (cursor->pRun == pRun)
 670           pRun = ME_FindItemFwd(pOtherRun, diRun);
 671         nOffset = 0;
 672         break;
 673       }
 674       else /* diTextEnd */
 675       {
 676         if (cursor->pRun == pRun)
 677           return FALSE;
 678         nOffset = 0;
 679         break;
 680       }
 681     }
 682   }
 683   cursor->pRun = pRun;
 684   cursor->nOffset = nOffset;
 685   return TRUE;
 686 }
 687
 688
 689 void
 690 ME_SelectWord(ME_TextEditor *editor)
 691 {
 692   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 693     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 694   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 695   ME_InvalidateSelection(editor);
 696   ME_SendSelChange(editor);
 697 }
 698
 699
 700 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 701 {
 702   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 703   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 704     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 705 }
 706
 707 static void ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 708 {
 709   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 710   ME_DisplayItem *last = NULL;
 711   int rx = 0;
 712
 713   if (is_eol)
 714     *is_eol = 0;
 715
 716   /* find paragraph */
 717   for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
 718   {
 719     assert(p->type == diParagraph);
 720     if (y < p->member.para.nYPos + p->member.para.nHeight)
 721     {
 722       y -= p->member.para.nYPos;
 723       p = ME_FindItemFwd(p, diStartRow);
 724       break;
 725     }
 726   }
 727   /* find row */
 728   for (; p != editor->pBuffer->pLast; )
 729   {
 730     ME_DisplayItem *pp;
 731     assert(p->type == diStartRow);
 732     if (y < p->member.row.nYPos + p->member.row.nHeight)
 733     {
 734         p = ME_FindItemFwd(p, diRun);
 735         break;
 736     }
 737     pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 738     if (pp->type != diStartRow)
 739     {
 740         p = ME_FindItemFwd(p, diRun);
 741         break;
 742     }
 743     p = pp;
 744   }
 745   for (; p != editor->pBuffer->pLast; p = p->next)
 746   {
 747     switch (p->type)
 748     {
 749     case diRun:
 750       rx = x - p->member.run.pt.x;
 751       if (rx < p->member.run.nWidth)
 752       {
 753       found_here:
 754         assert(p->type == diRun);
 755         if ((p->member.run.nFlags & MERF_ENDPARA) || rx < 0)
 756           rx = 0;
 757         result->pRun = p;
 758         result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 759         if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 760         {
 761           result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 762           result->nOffset = 0;
 763         }
 764         return;
 765       }
 766       break;
 767     case diStartRow:
 768       p = ME_FindItemFwd(p, diRun);
 769       if (is_eol) *is_eol = 1;
 770       rx = 0; /* FIXME not sure */
 771       goto found_here;
 772     case diParagraph:
 773     case diTextEnd:
 774       rx = 0; /* FIXME not sure */
 775       p = last;
 776       goto found_here;
 777     default: assert(0);
 778     }
 779     last = p;
 780   }
 781   result->pRun = ME_FindItemBack(p, diRun);
 782   result->nOffset = 0;
 783   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 784 }
 785
 786
 787 int
 788 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 789 {
 790   ME_Cursor cursor;
 791   RECT rc;
 792
 793   GetClientRect(editor->hWnd, &rc);
 794   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 795     return -1;
 796   y += ME_GetYScrollPos(editor);
 797   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 798   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 799           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 800 }
 801
 802
 803 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 804 {
 805   ME_Cursor tmp_cursor;
 806   int is_selection = 0;
 807
 808   editor->nUDArrowX = -1;
 809
 810   y += ME_GetYScrollPos(editor);
 811
 812   tmp_cursor = editor->pCursors[0];
 813   is_selection = ME_IsSelection(editor);
 814
 815   if (x >= editor->selofs)
 816   {
 817     ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 818     if (GetKeyState(VK_SHIFT)>=0)
 819     {
 820       editor->pCursors[1] = editor->pCursors[0];
 821     }
 822     else if (!is_selection) {
 823       editor->pCursors[1] = tmp_cursor;
 824       is_selection = 1;
 825     }
 826
 827     ME_InvalidateSelection(editor);
 828     HideCaret(editor->hWnd);
 829     ME_MoveCaret(editor);
 830     ShowCaret(editor->hWnd);
 831     ME_ClearTempStyle(editor);
 832     ME_SendSelChange(editor);
 833   }
 834   else
 835   {
 836     ME_DisplayItem *pRow;
 837
 838     editor->linesel = 1;
 839     editor->sely = y;
 840     /* Set pCursors[0] to beginning of line */
 841     ME_FindPixelPos(editor, x, y, &editor->pCursors[1], &editor->bCaretAtEnd);
 842     /* Set pCursors[1] to end of line */
 843     pRow = ME_FindItemFwd(editor->pCursors[1].pRun, diStartRowOrParagraphOrEnd);
 844     assert(pRow);
 845     /* pCursor[0] is the position where the cursor will be drawn,
 846      * pCursor[1] is the other end of the selection range
 847      * pCursor[2] and [3] are backups of [0] and [1] so I
 848      * don't have to look them up again
 849      */
 850
 851     if (pRow->type == diStartRow) {
 852       /* FIXME WTF was I thinking about here ? */
 853       ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
 854       assert(pRun);
 855       editor->pCursors[0].pRun = pRun;
 856       editor->pCursors[0].nOffset = 0;
 857       editor->bCaretAtEnd = 1;
 858     } else {
 859       editor->pCursors[0].pRun = ME_FindItemBack(pRow, diRun);
 860       assert(editor->pCursors[0].pRun && editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA);
 861       editor->pCursors[0].nOffset = 0;
 862       editor->bCaretAtEnd = 0;
 863     }
 864     editor->pCursors[2] = editor->pCursors[0];
 865     editor->pCursors[3] = editor->pCursors[1];
 866     ME_InvalidateSelection(editor);
 867     HideCaret(editor->hWnd);
 868     ME_MoveCaret(editor);
 869     ShowCaret(editor->hWnd);
 870     ME_ClearTempStyle(editor);
 871     ME_SendSelChange(editor);
 872   }
 873 }
 874
 875 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 876 {
 877   ME_Cursor tmp_cursor;
 878
 879   y += ME_GetYScrollPos(editor);
 880
 881   tmp_cursor = editor->pCursors[0];
 882   /* FIXME: do something with the return value of ME_FindPixelPos */
 883   if (!editor->linesel)
 884     ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 885   else ME_FindPixelPos(editor, (y > editor->sely) * editor->rcFormat.right, y, &tmp_cursor, &editor->bCaretAtEnd);
 886
 887   if (!memcmp(&tmp_cursor, editor->pCursors, sizeof(tmp_cursor)))
 888     return;
 889
 890   ME_InvalidateSelection(editor);
 891   if (!editor->linesel)
 892     editor->pCursors[0] = tmp_cursor;
 893   else if (!memcmp(&tmp_cursor, editor->pCursors+2, sizeof(tmp_cursor)) ||
 894            !memcmp(&tmp_cursor, editor->pCursors+3, sizeof(tmp_cursor)))
 895   {
 896     editor->pCursors[0] = editor->pCursors[2];
 897     editor->pCursors[1] = editor->pCursors[3];
 898   }
 899   else if (y < editor->sely)
 900   {
 901     editor->pCursors[0] = tmp_cursor;
 902     editor->pCursors[1] = editor->pCursors[2];
 903   }
 904   else
 905   {
 906     editor->pCursors[0] = tmp_cursor;
 907     editor->pCursors[1] = editor->pCursors[3];
 908   }
 909
 910   HideCaret(editor->hWnd);
 911   ME_MoveCaret(editor);
 912   ME_InvalidateSelection(editor);
 913   ShowCaret(editor->hWnd);
 914   ME_SendSelChange(editor);
 915 }
 916
 917 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 918                                 int x, int *pOffset, int *pbCaretAtEnd)
 919 {
 920   ME_DisplayItem *pNext, *pLastRun;
 921   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 922   assert(pNext->type == diRun);
 923   pLastRun = pNext;
 924   *pbCaretAtEnd = FALSE;
 925   do {
 926     int run_x = pNext->member.run.pt.x;
 927     int width = pNext->member.run.nWidth;
 928     if (x < run_x)
 929     {
 930       if (pOffset) *pOffset = 0;
 931       return pNext;
 932     }
 933     if (x >= run_x && x < run_x+width)
 934     {
 935       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 936       ME_String *s = pNext->member.run.strText;
 937       if (ch < s->nLen) {
 938         if (pOffset)
 939           *pOffset = ch;
 940         return pNext;
 941       }
 942     }
 943     pLastRun = pNext;
 944     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
 945   } while(pNext && pNext->type == diRun);
 946
 947   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
 948   {
 949     pNext = ME_FindItemFwd(pNext, diRun);
 950     if (pbCaretAtEnd) *pbCaretAtEnd = 1;
 951     if (pOffset) *pOffset = 0;
 952     return pNext;
 953   } else {
 954     if (pbCaretAtEnd) *pbCaretAtEnd = 0;
 955     if (pOffset) *pOffset = 0;
 956     return pLastRun;
 957   }
 958 }
 959
 960 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
 961 {
 962   ME_DisplayItem *pRun = pCursor->pRun;
 963   int x;
 964
 965   if (editor->nUDArrowX != -1)
 966     x = editor->nUDArrowX;
 967   else {
 968     if (editor->bCaretAtEnd)
 969     {
 970       pRun = ME_FindItemBack(pRun, diRun);
 971       assert(pRun);
 972       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
 973     }
 974     else {
 975       x = pRun->member.run.pt.x;
 976       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
 977     }
 978     editor->nUDArrowX = x;
 979   }
 980   return x;
 981 }
 982
 983
 984 static void
 985 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 986 {
 987   ME_DisplayItem *pRun = pCursor->pRun;
 988   ME_DisplayItem *pItem;
 989   int x = ME_GetXForArrow(editor, pCursor);
 990
 991   if (editor->bCaretAtEnd && !pCursor->nOffset)
 992     pRun = ME_FindItemBack(pRun, diRun);
 993   if (!pRun)
 994     return;
 995   if (nRelOfs == -1)
 996   {
 997     /* start of this row */
 998     pItem = ME_FindItemBack(pRun, diStartRow);
 999     assert(pItem);
1000     /* start of the previous row */
1001     pItem = ME_FindItemBack(pItem, diStartRow);
1002   }
1003   else
1004   {
1005     /* start of the next row */
1006     pItem = ME_FindItemFwd(pRun, diStartRow);
1007     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
1008     */
1009   }
1010   if (!pItem)
1011   {
1012     /* row not found - ignore */
1013     return;
1014   }
1015   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1016   assert(pCursor->pRun);
1017   assert(pCursor->pRun->type == diRun);
1018 }
1019
1020
1021 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1022 {
1023   ME_DisplayItem *pRun = pCursor->pRun;
1024   ME_DisplayItem *pLast, *p;
1025   int x, y, ys, yd, yp, yprev;
1026   ME_Cursor tmp_curs = *pCursor;
1027
1028   x = ME_GetXForArrow(editor, pCursor);
1029   if (!pCursor->nOffset && editor->bCaretAtEnd)
1030     pRun = ME_FindItemBack(pRun, diRun);
1031
1032   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1033   assert(p->type == diStartRow);
1034   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1035   yprev = ys = y = yp + p->member.row.nYPos;
1036   yd = y - editor->sizeWindow.cy;
1037   pLast = p;
1038
1039   do {
1040     p = ME_FindItemBack(p, diStartRowOrParagraph);
1041     if (!p)
1042       break;
1043     if (p->type == diParagraph) { /* crossing paragraphs */
1044       if (p->member.para.prev_para == NULL)
1045         break;
1046       yp = p->member.para.prev_para->member.para.nYPos;
1047       continue;
1048     }
1049     y = yp + p->member.row.nYPos;
1050     if (y < yd)
1051       break;
1052     pLast = p;
1053     yprev = y;
1054   } while(1);
1055
1056   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1057   ME_UpdateSelection(editor, &tmp_curs);
1058   if (yprev < editor->sizeWindow.cy)
1059   {
1060     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1061     ME_Repaint(editor);
1062   }
1063   else
1064   {
1065     ME_ScrollUp(editor, ys-yprev);
1066   }
1067   assert(pCursor->pRun);
1068   assert(pCursor->pRun->type == diRun);
1069 }
1070
1071 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1072    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1073    In such a situation, clicking the scrollbar restores its position back to the
1074    normal range (ie. sets it to (doclength-screenheight)). */
1075
1076 static void ME_ArrowPageDown(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_FindItemFwd(p, diStartRowOrParagraph);
1096     if (!p)
1097       break;
1098     if (p->type == diParagraph) {
1099       yp = p->member.para.nYPos;
1100       continue;
1101     }
1102     y = yp + p->member.row.nYPos;
1103     if (y >= yd)
1104       break;
1105     pLast = p;
1106     yprev = y;
1107   } while(1);
1108
1109   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1110   ME_UpdateSelection(editor, &tmp_curs);
1111   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1112   {
1113     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1114     ME_Repaint(editor);
1115   }
1116   else
1117   {
1118     ME_ScrollUp(editor,ys-yprev);
1119   }
1120   assert(pCursor->pRun);
1121   assert(pCursor->pRun->type == diRun);
1122 }
1123
1124 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1125 {
1126   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1127   /* bCaretAtEnd doesn't make sense if the cursor isn't set at the
1128   first character of the next row */
1129   assert(!editor->bCaretAtEnd || !pCursor->nOffset);
1130   ME_WrapMarkedParagraphs(editor);
1131   if (pRow) {
1132     ME_DisplayItem *pRun;
1133     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1134       pRow = ME_FindItemBack(pRow, diStartRow);
1135       if (!pRow)
1136         return;
1137     }
1138     pRun = ME_FindItemFwd(pRow, diRun);
1139     if (pRun) {
1140       pCursor->pRun = pRun;
1141       pCursor->nOffset = 0;
1142     }
1143   }
1144   editor->bCaretAtEnd = FALSE;
1145 }
1146
1147 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1148 {
1149   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1150   if (pRow) {
1151     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1152     if (pRun) {
1153       pCursor->pRun = pRun;
1154       pCursor->nOffset = 0;
1155     }
1156   }
1157 }
1158
1159 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1160 {
1161   ME_DisplayItem *pRow;
1162
1163   if (editor->bCaretAtEnd && !pCursor->nOffset)
1164     return;
1165
1166   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1167   assert(pRow);
1168   if (pRow->type == diStartRow) {
1169     /* FIXME WTF was I thinking about here ? */
1170     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1171     assert(pRun);
1172     pCursor->pRun = pRun;
1173     pCursor->nOffset = 0;
1174     editor->bCaretAtEnd = 1;
1175     return;
1176   }
1177   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1178   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1179   pCursor->nOffset = 0;
1180   editor->bCaretAtEnd = FALSE;
1181 }
1182
1183 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1184 {
1185   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1186   assert(p);
1187   p = ME_FindItemBack(p, diRun);
1188   assert(p);
1189   assert(p->member.run.nFlags & MERF_ENDPARA);
1190   pCursor->pRun = p;
1191   pCursor->nOffset = 0;
1192   editor->bCaretAtEnd = FALSE;
1193 }
1194
1195 BOOL ME_IsSelection(ME_TextEditor *editor)
1196 {
1197   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1198 }
1199
1200 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1201 {
1202   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1203
1204   if (cdir*dir>0)
1205     return 0;
1206   else
1207     return 1;
1208 }
1209
1210 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1211 {
1212   ME_Cursor old_anchor = editor->pCursors[1];
1213
1214   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1215   {
1216     /* any selection was present ? if so, it's no more, repaint ! */
1217     editor->pCursors[1] = editor->pCursors[0];
1218     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1219       return TRUE;
1220     }
1221     return FALSE;
1222   }
1223   else
1224   {
1225     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1226     {
1227       editor->pCursors[1] = *pTempCursor;
1228       return TRUE;
1229     }
1230   }
1231
1232   ME_Repaint(editor);
1233   return TRUE;
1234 }
1235
1236 void ME_DeleteSelection(ME_TextEditor *editor)
1237 {
1238   int from, to;
1239   ME_GetSelection(editor, &from, &to);
1240   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1241 }
1242
1243 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1244 {
1245   ME_Style *style;
1246   int from, to;
1247
1248   ME_GetSelection(editor, &from, &to);
1249   if (from != to) {
1250     ME_Cursor c;
1251     ME_CursorFromCharOfs(editor, from, &c);
1252     style = c.pRun->member.run.style;
1253     ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
1254   }
1255   else
1256     style = ME_GetInsertStyle(editor, 0);
1257   return style;
1258 }
1259
1260 void ME_SendSelChange(ME_TextEditor *editor)
1261 {
1262   SELCHANGE sc;
1263
1264   ME_ClearTempStyle(editor);
1265
1266   if (!(editor->nEventMask & ENM_SELCHANGE))
1267     return;
1268
1269   sc.nmhdr.hwndFrom = editor->hWnd;
1270   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1271   sc.nmhdr.code = EN_SELCHANGE;
1272   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1273   sc.seltyp = SEL_EMPTY;
1274   if (sc.chrg.cpMin != sc.chrg.cpMax)
1275     sc.seltyp |= SEL_TEXT;
1276   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1277     sc.seltyp |= SEL_MULTICHAR;
1278   SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1279 }
1280
1281 BOOL
1282 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1283 {
1284   int nCursor = 0;
1285   ME_Cursor *p = &editor->pCursors[nCursor];
1286   ME_Cursor tmp_curs = *p;
1287   BOOL success = FALSE;
1288
1289   ME_CheckCharOffsets(editor);
1290   editor->nUDArrowX = -1;
1291   switch(nVKey) {
1292     case VK_LEFT:
1293       editor->bCaretAtEnd = 0;
1294       if (ctrl)
1295         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1296       else
1297         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1298       break;
1299     case VK_RIGHT:
1300       editor->bCaretAtEnd = 0;
1301       if (ctrl)
1302         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1303       else
1304         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1305       break;
1306     case VK_UP:
1307       ME_MoveCursorLines(editor, &tmp_curs, -1);
1308       break;
1309     case VK_DOWN:
1310       ME_MoveCursorLines(editor, &tmp_curs, +1);
1311       break;
1312     case VK_PRIOR:
1313       ME_ArrowPageUp(editor, &tmp_curs);
1314       break;
1315     case VK_NEXT:
1316       ME_ArrowPageDown(editor, &tmp_curs);
1317       break;
1318     case VK_HOME: {
1319       if (ctrl)
1320         ME_ArrowCtrlHome(editor, &tmp_curs);
1321       else
1322         ME_ArrowHome(editor, &tmp_curs);
1323       editor->bCaretAtEnd = 0;
1324       break;
1325     }
1326     case VK_END:
1327       if (ctrl)
1328         ME_ArrowCtrlEnd(editor, &tmp_curs);
1329       else
1330         ME_ArrowEnd(editor, &tmp_curs);
1331       break;
1332   }
1333
1334   if (!extend)
1335     editor->pCursors[1] = tmp_curs;
1336   *p = tmp_curs;
1337
1338   ME_InvalidateSelection(editor);
1339   ME_Repaint(editor);
1340   HideCaret(editor->hWnd);
1341   ME_EnsureVisible(editor, tmp_curs.pRun);
1342   ME_ShowCaret(editor);
1343   ME_SendSelChange(editor);
1344   return success;
1345 }