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)
  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(height && x && y);
 168   assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
 169   assert(pCursor->pRun);
 170   assert(pCursor->pRun->type == diRun);
 171
 172   if (pCursorRun->type == diRun) {
 173     ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
 174
 175     if (row) {
 176       HDC hDC = GetDC(editor->hWnd);
 177       ME_Context c;
 178       ME_DisplayItem *run = pCursorRun;
 179       ME_DisplayItem *para = NULL;
 180       SIZE sz = {0, 0};
 181
 182       ME_InitContext(&c, editor, hDC);
 183
 184       if (!pCursor->nOffset)
 185       {
 186         ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrParagraph);
 187         assert(prev);
 188         if (prev->type == diRun)
 189           pSizeRun = prev;
 190       }
 191       assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
 192       para = ME_FindItemBack(row, diParagraph);
 193       assert(para);
 194       assert(para->type == diParagraph);
 195       if (editor->bCaretAtEnd && !pCursor->nOffset &&
 196           run == ME_FindItemFwd(row, diRun))
 197       {
 198         ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
 199         assert(tmp);
 200         if (tmp->type == diRun)
 201         {
 202           row = ME_FindItemBack(tmp, diStartRow);
 203           pSizeRun = run = tmp;
 204           assert(run);
 205           assert(run->type == diRun);
 206           sz = ME_GetRunSize(&c, &para->member.para,
 207                              &run->member.run, ME_StrLen(run->member.run.strText),
 208                              row->member.row.nLMargin);
 209         }
 210       }
 211       if (pCursor->nOffset) {
 212         sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset,
 213                            row->member.row.nLMargin);
 214       }
 215
 216       *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
 217       *x = run->member.run.pt.x + sz.cx;
 218       *y = para->member.para.nYPos + row->member.row.nBaseline + run->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
 219       ME_DestroyContext(&c, editor->hWnd);
 220       return;
 221     }
 222   }
 223   *height = 10; /* FIXME use global font */
 224   *x = 0;
 225   *y = 0;
 226 }
 227
 228
 229 void
 230 ME_MoveCaret(ME_TextEditor *editor)
 231 {
 232   int x, y, height;
 233
 234   if (ME_WrapMarkedParagraphs(editor))
 235     ME_UpdateScrollBar(editor);
 236   ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
 237   if(editor->bHaveFocus && !ME_IsSelection(editor))
 238   {
 239     RECT rect;
 240
 241     GetClientRect(editor->hWnd, &rect);
 242     x = min(x, rect.right-2);
 243     CreateCaret(editor->hWnd, NULL, 0, height);
 244     SetCaretPos(x, y);
 245   } else {
 246     DestroyCaret();
 247   }
 248 }
 249
 250
 251 void ME_ShowCaret(ME_TextEditor *ed)
 252 {
 253   ME_MoveCaret(ed);
 254   if(ed->bHaveFocus && !ME_IsSelection(ed))
 255     ShowCaret(ed->hWnd);
 256 }
 257
 258 void ME_HideCaret(ME_TextEditor *ed)
 259 {
 260   if(!ed->bHaveFocus || ME_IsSelection(ed))
 261   {
 262     HideCaret(ed->hWnd);
 263     DestroyCaret();
 264   }
 265 }
 266
 267 void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
 268   int nChars)
 269 {
 270   ME_Cursor c;
 271   int shift = 0;
 272
 273   while(nChars > 0)
 274   {
 275     ME_Run *run;
 276     ME_CursorFromCharOfs(editor, nOfs, &c);
 277     run = &c.pRun->member.run;
 278     if (run->nFlags & MERF_ENDPARA) {
 279       int eollen = run->nCR + run->nLF;
 280
 281       if (!ME_FindItemFwd(c.pRun, diParagraph))
 282       {
 283         return;
 284       }
 285       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 286       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 287       ME_CheckCharOffsets(editor);
 288       nChars -= (eollen < nChars) ? eollen : nChars;
 289       continue;
 290     }
 291     else
 292     {
 293       ME_Cursor cursor;
 294       int nIntendedChars = nChars;
 295       int nCharsToDelete = nChars;
 296       int i;
 297       int loc = c.nOffset;
 298
 299       ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
 300
 301       cursor = c;
 302       ME_StrRelPos(run->strText, loc, &nChars);
 303       /* nChars is the number of characters that should be deleted from the
 304          FOLLOWING runs (these AFTER cursor.pRun)
 305          nCharsToDelete is a number of chars to delete from THIS run */
 306       nCharsToDelete -= nChars;
 307       shift -= nCharsToDelete;
 308       TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
 309         nCharsToDelete, nIntendedChars, nChars, c.nOffset,
 310         debugstr_w(run->strText->szData), run->strText->nLen);
 311
 312       if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
 313       {
 314         /* undo = reinsert whole run */
 315         /* nOfs is a character offset (from the start of the document
 316            to the current (deleted) run */
 317         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 318         if (pUndo)
 319           pUndo->di.member.run.nCharOfs = nOfs;
 320       }
 321       else
 322       {
 323         /* undo = reinsert partial run */
 324         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 325         if (pUndo) {
 326           ME_DestroyString(pUndo->di.member.run.strText);
 327           pUndo->di.member.run.nCharOfs = nOfs;
 328           pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
 329         }
 330       }
 331       TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
 332       TRACE("Shift value: %d\n", shift);
 333       ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
 334
 335       /* update cursors (including c) */
 336       for (i=-1; i<editor->nCursors; i++) {
 337         ME_Cursor *pThisCur = editor->pCursors + i;
 338         if (i == -1) pThisCur = &c;
 339         if (pThisCur->pRun == cursor.pRun) {
 340           if (pThisCur->nOffset > cursor.nOffset) {
 341             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 342               pThisCur->nOffset = cursor.nOffset;
 343             else
 344               pThisCur->nOffset -= nCharsToDelete;
 345             assert(pThisCur->nOffset >= 0);
 346             assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
 347           }
 348           if (pThisCur->nOffset == ME_StrVLen(run->strText))
 349           {
 350             pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
 351             assert(pThisCur->pRun->type == diRun);
 352             pThisCur->nOffset = 0;
 353           }
 354         }
 355       }
 356
 357       /* c = updated data now */
 358
 359       if (c.pRun == cursor.pRun)
 360         ME_SkipAndPropagateCharOffset(c.pRun, shift);
 361       else
 362         ME_PropagateCharOffset(c.pRun, shift);
 363
 364       if (!ME_StrVLen(cursor.pRun->member.run.strText))
 365       {
 366         TRACE("Removing useless run\n");
 367         ME_Remove(cursor.pRun);
 368         ME_DestroyDisplayItem(cursor.pRun);
 369       }
 370
 371       shift = 0;
 372       /*
 373       ME_CheckCharOffsets(editor);
 374       */
 375       continue;
 376     }
 377   }
 378 }
 379
 380 void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
 381   int nChars)
 382 {
 383   assert(nCursor>=0 && nCursor<editor->nCursors);
 384   /* text operations set modified state */
 385   editor->nModifyStep = 1;
 386   ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
 387 }
 388
 389 static ME_DisplayItem *
 390 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 391                                 const WCHAR *str, int len, ME_Style *style,
 392                                 int flags)
 393 {
 394   ME_Cursor *p = &editor->pCursors[nCursor];
 395
 396   editor->bCaretAtEnd = FALSE;
 397
 398   assert(p->pRun->type == diRun);
 399
 400   return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
 401 }
 402
 403
 404 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
 405 {
 406   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 407   ME_DisplayItem        *di;
 408   WCHAR                 space = ' ';
 409
 410   /* FIXME no no no */
 411   if (ME_IsSelection(editor))
 412     ME_DeleteSelection(editor);
 413
 414   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 415                                        MERF_GRAPHICS);
 416   di->member.run.ole_obj = ALLOC_OBJ(*reo);
 417   ME_CopyReObject(di->member.run.ole_obj, reo);
 418   ME_SendSelChange(editor);
 419 }
 420
 421
 422 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
 423 {
 424   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 425   ME_DisplayItem        *di;
 426   WCHAR                 space = ' ';
 427
 428   /* FIXME no no no */
 429   if (ME_IsSelection(editor))
 430     ME_DeleteSelection(editor);
 431
 432   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 433                                        MERF_ENDROW);
 434   ME_SendSelChange(editor);
 435 }
 436
 437 void
 438 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 439 {
 440   WCHAR tab = '\t';
 441   ME_DisplayItem *p, *run;
 442   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 443
 444   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 445                                       MERF_CELL);
 446   run = p;
 447   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 448   {
 449     if (run->member.run.nFlags & MERF_CELL)
 450     {
 451       assert(run->member.run.pCell->next);
 452       p->member.run.pCell = run->member.run.pCell->next;
 453       return;
 454     }
 455   }
 456   assert(run->type == diParagraph);
 457   assert(run->member.para.bTable);
 458   assert(run->member.para.pCells);
 459   p->member.run.pCell = run->member.para.pCells;
 460 }
 461
 462
 463 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 464   const WCHAR *str, int len, ME_Style *style)
 465 {
 466   const WCHAR *pos;
 467   ME_Cursor *p = NULL;
 468   int oldLen;
 469
 470   /* FIXME really HERE ? */
 471   if (ME_IsSelection(editor))
 472     ME_DeleteSelection(editor);
 473
 474   /* FIXME: is this too slow? */
 475   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 476   oldLen = ME_GetTextLength(editor);
 477
 478   /* text operations set modified state */
 479   editor->nModifyStep = 1;
 480
 481   assert(style);
 482
 483   assert(nCursor>=0 && nCursor<editor->nCursors);
 484   if (len == -1)
 485     len = lstrlenW(str);
 486
 487   /* grow the text limit to fit our text */
 488   if(editor->nTextLimit < oldLen +len)
 489     editor->nTextLimit = oldLen + len;
 490
 491   while (len)
 492   {
 493     pos = str;
 494     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 495     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 496       pos++;
 497     if (pos-str < len && *pos == '\t') { /* handle tabs */
 498       WCHAR tab = '\t';
 499
 500       if (pos!=str)
 501         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 502
 503       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 504
 505       pos++;
 506       if(pos-str <= len) {
 507         len -= pos - str;
 508         str = pos;
 509         continue;
 510       }
 511     }
 512     /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 513     if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
 514       WCHAR space = ' ';
 515
 516       if (pos!=str)
 517         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 518
 519       ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
 520
 521       pos+=3;
 522       if(pos-str <= len) {
 523         len -= pos - str;
 524         str = pos;
 525         continue;
 526       }
 527     }
 528     if (pos-str < len) {   /* handle EOLs */
 529       ME_DisplayItem *tp, *end_run;
 530       ME_Style *tmp_style;
 531       int numCR, numLF;
 532
 533       if (pos!=str)
 534         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 535       p = &editor->pCursors[nCursor];
 536       if (p->nOffset) {
 537         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 538         p = &editor->pCursors[nCursor];
 539       }
 540       tmp_style = ME_GetInsertStyle(editor, nCursor);
 541       /* ME_SplitParagraph increases style refcount */
 542
 543       /* Encode and fill number of CR and LF according to emulation mode */
 544       if (editor->bEmulateVersion10) {
 545         const WCHAR * tpos;
 546
 547         /* We have to find out how many consecutive \r are there, and if there
 548            is a \n terminating the run of \r's. */
 549         numCR = 0; numLF = 0;
 550         tpos = pos;
 551         while (tpos-str < len && *tpos == '\r') {
 552           tpos++;
 553           numCR++;
 554         }
 555         if (tpos-str >= len) {
 556           /* Reached end of text without finding anything but '\r' */
 557           if (tpos != pos) {
 558             pos++;
 559           }
 560           numCR = 1; numLF = 0;
 561         } else if (*tpos == '\n') {
 562           /* The entire run of \r's plus the one \n is one single line break */
 563           pos = tpos + 1;
 564           numLF = 1;
 565         } else {
 566           /* Found some other content past the run of \r's */
 567           pos++;
 568           numCR = 1; numLF = 0;
 569         }
 570       } else {
 571         if(pos-str < len && *pos =='\r')
 572           pos++;
 573         if(pos-str < len && *pos =='\n')
 574           pos++;
 575         numCR = 1; numLF = 0;
 576       }
 577       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, numCR, numLF);
 578       p->pRun = ME_FindItemFwd(tp, diRun);
 579       end_run = ME_FindItemBack(tp, diRun);
 580       ME_ReleaseStyle(end_run->member.run.style);
 581       end_run->member.run.style = tmp_style;
 582       p->nOffset = 0;
 583
 584       if(pos-str <= len) {
 585         len -= pos - str;
 586         str = pos;
 587         continue;
 588       }
 589     }
 590     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 591     len = 0;
 592   }
 593 }
 594
 595
 596 static BOOL
 597 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 598 {
 599   ME_DisplayItem *pRun = pCursor->pRun;
 600
 601   if (nRelOfs == -1)
 602   {
 603     if (!pCursor->nOffset)
 604     {
 605       do {
 606         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 607         assert(pRun);
 608         switch (pRun->type)
 609         {
 610           case diRun:
 611             break;
 612           case diParagraph:
 613             if (pRun->member.para.prev_para->type == diTextStart)
 614               return FALSE;
 615             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 616             /* every paragraph ought to have at least one run */
 617             assert(pRun && pRun->type == diRun);
 618             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 619             break;
 620           default:
 621             assert(pRun->type != diRun && pRun->type != diParagraph);
 622             return FALSE;
 623         }
 624       } while (RUN_IS_HIDDEN(&pRun->member.run));
 625       pCursor->pRun = pRun;
 626       if (pRun->member.run.nFlags & MERF_ENDPARA)
 627         pCursor->nOffset = 0;
 628       else
 629         pCursor->nOffset = pRun->member.run.strText->nLen;
 630     }
 631
 632     if (pCursor->nOffset)
 633       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 634     return TRUE;
 635   }
 636   else
 637   {
 638     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 639     {
 640       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 641
 642       if (new_ofs < pRun->member.run.strText->nLen)
 643       {
 644         pCursor->nOffset = new_ofs;
 645         return TRUE;
 646       }
 647     }
 648     do {
 649       pRun = ME_FindItemFwd(pRun, diRun);
 650     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 651     if (pRun)
 652     {
 653       pCursor->pRun = pRun;
 654       pCursor->nOffset = 0;
 655       return TRUE;
 656     }
 657   }
 658   return FALSE;
 659 }
 660
 661
 662 static BOOL
 663 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 664 {
 665   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 666   int nOffset = cursor->nOffset;
 667
 668   if (nRelOfs == -1)
 669   {
 670     /* Backward movement */
 671     while (TRUE)
 672     {
 673       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 674                                      nOffset, WB_MOVEWORDLEFT);
 675        if (nOffset)
 676         break;
 677       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 678       if (pOtherRun->type == diRun)
 679       {
 680         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 681                                  pOtherRun->member.run.strText->nLen - 1,
 682                                  WB_ISDELIMITER)
 683             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 684             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 685             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 686                                      WB_ISDELIMITER))
 687           break;
 688         pRun = pOtherRun;
 689         nOffset = pOtherRun->member.run.strText->nLen;
 690       }
 691       else if (pOtherRun->type == diParagraph)
 692       {
 693         if (cursor->pRun == pRun && cursor->nOffset == 0)
 694         {
 695           /* Paragraph breaks are treated as separate words */
 696           if (pOtherRun->member.para.prev_para->type == diTextStart)
 697             return FALSE;
 698           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 699         }
 700         break;
 701       }
 702     }
 703   }
 704   else
 705   {
 706     /* Forward movement */
 707     BOOL last_delim = FALSE;
 708
 709     while (TRUE)
 710     {
 711       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 712                                               nOffset, WB_ISDELIMITER))
 713         break;
 714       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 715                                      nOffset, WB_MOVEWORDRIGHT);
 716       if (nOffset < pRun->member.run.strText->nLen)
 717         break;
 718       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 719       if (pOtherRun->type == diRun)
 720       {
 721         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 722                                           nOffset - 1, WB_ISDELIMITER);
 723         pRun = pOtherRun;
 724         nOffset = 0;
 725       }
 726       else if (pOtherRun->type == diParagraph)
 727       {
 728         if (cursor->pRun == pRun)
 729           pRun = ME_FindItemFwd(pOtherRun, diRun);
 730         nOffset = 0;
 731         break;
 732       }
 733       else /* diTextEnd */
 734       {
 735         if (cursor->pRun == pRun)
 736           return FALSE;
 737         nOffset = 0;
 738         break;
 739       }
 740     }
 741   }
 742   cursor->pRun = pRun;
 743   cursor->nOffset = nOffset;
 744   return TRUE;
 745 }
 746
 747
 748 void
 749 ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
 750 {
 751   /* pCursor[0] will be the start of the selection
 752    * pCursor[1] is the other end of the selection range
 753    * pCursor[2] and [3] are the selection anchors that are backed up
 754    * so they are kept when the selection changes for drag selection.
 755    */
 756
 757   editor->nSelectionType = selectionType;
 758   switch(selectionType)
 759   {
 760     case stPosition:
 761       break;
 762     case stWord:
 763       ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 764       editor->pCursors[0] = editor->pCursors[1];
 765       ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 766       break;
 767     case stLine:
 768     case stParagraph:
 769     {
 770       ME_DisplayItem *pItem;
 771       ME_DIType fwdSearchType, backSearchType;
 772       if (selectionType == stParagraph) {
 773           backSearchType = diParagraph;
 774           fwdSearchType = diParagraphOrEnd;
 775       } else {
 776           backSearchType = diStartRow;
 777           fwdSearchType = diStartRowOrParagraphOrEnd;
 778       }
 779       pItem = ME_FindItemBack(editor->pCursors[0].pRun, backSearchType);
 780       editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
 781       editor->pCursors[0].nOffset = 0;
 782
 783       pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
 784       assert(pItem);
 785       if (pItem->type == diTextEnd)
 786           editor->pCursors[1].pRun = ME_FindItemBack(pItem, diRun);
 787       else
 788           editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
 789       editor->pCursors[1].nOffset = 0;
 790       break;
 791     }
 792     case stDocument:
 793       /* Select everything with cursor anchored from the start of the text */
 794       editor->nSelectionType = stDocument;
 795       editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
 796       editor->pCursors[1].nOffset = 0;
 797       editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 798       editor->pCursors[0].nOffset = 0;
 799       break;
 800     default: assert(0);
 801   }
 802   /* Store the anchor positions for extending the selection. */
 803   editor->pCursors[2] = editor->pCursors[0];
 804   editor->pCursors[3] = editor->pCursors[1];
 805 }
 806
 807
 808 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 809 {
 810   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 811   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 812     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 813 }
 814
 815 static void ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 816 {
 817   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 818   ME_DisplayItem *last = NULL;
 819   int rx = 0;
 820
 821   if (is_eol)
 822     *is_eol = 0;
 823
 824   /* find paragraph */
 825   for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
 826   {
 827     assert(p->type == diParagraph);
 828     if (y < p->member.para.nYPos + p->member.para.nHeight)
 829     {
 830       y -= p->member.para.nYPos;
 831       p = ME_FindItemFwd(p, diStartRow);
 832       break;
 833     }
 834   }
 835   /* find row */
 836   for (; p != editor->pBuffer->pLast; )
 837   {
 838     ME_DisplayItem *pp;
 839     assert(p->type == diStartRow);
 840     if (y < p->member.row.nYPos + p->member.row.nHeight)
 841     {
 842         p = ME_FindItemFwd(p, diRun);
 843         break;
 844     }
 845     pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 846     if (pp->type != diStartRow)
 847     {
 848         p = ME_FindItemFwd(p, diRun);
 849         break;
 850     }
 851     p = pp;
 852   }
 853   if (p == editor->pBuffer->pLast)
 854   {
 855     /* The position is below the last paragraph, so the last row will be used
 856      * rather than the end of the text, so the x position will be used to
 857      * determine the offset closest to the pixel position. */
 858     p = ME_FindItemBack(p, diStartRow);
 859     if (p != NULL){
 860       p = ME_FindItemFwd(p, diRun);
 861     }
 862     else
 863     {
 864       p = editor->pBuffer->pLast;
 865     }
 866   }
 867   for (; p != editor->pBuffer->pLast; p = p->next)
 868   {
 869     switch (p->type)
 870     {
 871     case diRun:
 872       rx = x - p->member.run.pt.x;
 873       if (rx < p->member.run.nWidth)
 874       {
 875       found_here:
 876         assert(p->type == diRun);
 877         if ((p->member.run.nFlags & MERF_ENDPARA) || rx < 0)
 878           rx = 0;
 879         result->pRun = p;
 880         result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 881         if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 882         {
 883           result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 884           result->nOffset = 0;
 885         }
 886         return;
 887       }
 888       break;
 889     case diStartRow:
 890       p = ME_FindItemFwd(p, diRun);
 891       if (is_eol) *is_eol = 1;
 892       rx = 0; /* FIXME not sure */
 893       goto found_here;
 894     case diParagraph:
 895     case diTextEnd:
 896       rx = 0; /* FIXME not sure */
 897       p = last;
 898       goto found_here;
 899     default: assert(0);
 900     }
 901     last = p;
 902   }
 903   result->pRun = ME_FindItemBack(p, diRun);
 904   result->nOffset = 0;
 905   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 906 }
 907
 908
 909 int
 910 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 911 {
 912   ME_Cursor cursor;
 913   RECT rc;
 914
 915   GetClientRect(editor->hWnd, &rc);
 916   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 917     return -1;
 918   y += ME_GetYScrollPos(editor);
 919   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 920   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 921           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 922 }
 923
 924 /* Extends the selection with a word, line, or paragraph selection type.
 925  *
 926  * The selection is anchored by editor->pCursors[2-3] such that the text
 927  * between the anchors will remain selected, and one end will be extended.
 928  *
 929  * editor->pCursors[0] should have the position to extend the selection to
 930  * before this function is called.
 931  *
 932  * Nothing will be done if editor->nSelectionType equals stPosition.
 933  */
 934 static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
 935 {
 936   ME_Cursor tmp_cursor;
 937   int curOfs, anchorStartOfs, anchorEndOfs;
 938   if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
 939       return;
 940   curOfs = ME_GetCursorOfs(editor, 0);
 941   anchorStartOfs = ME_GetCursorOfs(editor, 2);
 942   anchorEndOfs = ME_GetCursorOfs(editor, 3);
 943
 944   tmp_cursor = editor->pCursors[0];
 945   editor->pCursors[0] = editor->pCursors[2];
 946   editor->pCursors[1] = editor->pCursors[3];
 947   if (curOfs < anchorStartOfs)
 948   {
 949       /* Extend the left side of selection */
 950       editor->pCursors[0] = tmp_cursor;
 951       if (editor->nSelectionType == stWord)
 952           ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 953       else
 954       {
 955           ME_DisplayItem *pItem;
 956           ME_DIType searchType = ((editor->nSelectionType == stLine) ?
 957                                   diStartRowOrParagraph:diParagraph);
 958           pItem = ME_FindItemBack(editor->pCursors[0].pRun, searchType);
 959           editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
 960           editor->pCursors[0].nOffset = 0;
 961       }
 962   }
 963   else if (curOfs >= anchorEndOfs)
 964   {
 965       /* Extend the right side of selection */
 966       editor->pCursors[1] = tmp_cursor;
 967       if (editor->nSelectionType == stWord)
 968           ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 969       else
 970       {
 971           ME_DisplayItem *pItem;
 972           ME_DIType searchType = ((editor->nSelectionType == stLine) ?
 973                                   diStartRowOrParagraphOrEnd:diParagraphOrEnd);
 974           pItem = ME_FindItemFwd(editor->pCursors[1].pRun, searchType);
 975           if (pItem->type == diTextEnd)
 976               editor->pCursors[1].pRun = ME_FindItemBack(pItem, diRun);
 977           else
 978               editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
 979           editor->pCursors[1].nOffset = 0;
 980       }
 981   }
 982 }
 983
 984 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
 985 {
 986   ME_Cursor tmp_cursor;
 987   int is_selection = 0;
 988   BOOL is_shift;
 989
 990   editor->nUDArrowX = -1;
 991
 992   y += ME_GetYScrollPos(editor);
 993
 994   tmp_cursor = editor->pCursors[0];
 995   is_selection = ME_IsSelection(editor);
 996   is_shift = GetKeyState(VK_SHIFT) < 0;
 997
 998   ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 999
1000   if (x >= editor->selofs || is_shift)
1001   {
1002     if (clickNum > 1)
1003     {
1004       editor->pCursors[1] = editor->pCursors[0];
1005       if (is_shift) {
1006           if (x >= editor->selofs)
1007               ME_SelectByType(editor, stWord);
1008           else
1009               ME_SelectByType(editor, stParagraph);
1010       } else if (clickNum % 2 == 0) {
1011           ME_SelectByType(editor, stWord);
1012       } else {
1013           ME_SelectByType(editor, stParagraph);
1014       }
1015     }
1016     else if (!is_shift)
1017     {
1018       editor->nSelectionType = stPosition;
1019       editor->pCursors[1] = editor->pCursors[0];
1020     }
1021     else if (!is_selection)
1022     {
1023       editor->nSelectionType = stPosition;
1024       editor->pCursors[1] = tmp_cursor;
1025     }
1026     else if (editor->nSelectionType != stPosition)
1027     {
1028       ME_ExtendAnchorSelection(editor);
1029     }
1030   }
1031   else
1032   {
1033     if (clickNum < 2) {
1034         ME_SelectByType(editor, stLine);
1035     } else if (clickNum % 2 == 0 || is_shift) {
1036         ME_SelectByType(editor, stParagraph);
1037     } else {
1038         ME_SelectByType(editor, stDocument);
1039     }
1040   }
1041   ME_InvalidateSelection(editor);
1042   HideCaret(editor->hWnd);
1043   ME_ShowCaret(editor);
1044   ME_ClearTempStyle(editor);
1045   ME_SendSelChange(editor);
1046 }
1047
1048 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
1049 {
1050   ME_Cursor tmp_cursor;
1051
1052   if (editor->nSelectionType == stDocument)
1053       return;
1054   y += ME_GetYScrollPos(editor);
1055
1056   tmp_cursor = editor->pCursors[0];
1057   /* FIXME: do something with the return value of ME_FindPixelPos */
1058   ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1059
1060   ME_InvalidateSelection(editor);
1061   editor->pCursors[0] = tmp_cursor;
1062   ME_ExtendAnchorSelection(editor);
1063
1064   if (editor->nSelectionType != stPosition &&
1065       memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1066   {
1067       /* The scroll the cursor towards the other end, since it was the one
1068        * extended by ME_ExtendAnchorSelection
1069        */
1070       ME_Cursor tmpCursor = editor->pCursors[0];
1071       editor->pCursors[0] = editor->pCursors[1];
1072       editor->pCursors[1] = tmpCursor;
1073       SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
1074       editor->pCursors[1] = editor->pCursors[0];
1075       editor->pCursors[0] = tmpCursor;
1076   } else {
1077       SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
1078   }
1079
1080   ME_InvalidateSelection(editor);
1081   HideCaret(editor->hWnd);
1082   ME_ShowCaret(editor);
1083   ME_SendSelChange(editor);
1084 }
1085
1086 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
1087                                 int x, int *pOffset, int *pbCaretAtEnd)
1088 {
1089   ME_DisplayItem *pNext, *pLastRun;
1090   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
1091   assert(pNext->type == diRun);
1092   pLastRun = pNext;
1093   if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
1094   if (pOffset) *pOffset = 0;
1095   do {
1096     int run_x = pNext->member.run.pt.x;
1097     int width = pNext->member.run.nWidth;
1098     if (x < run_x)
1099     {
1100       return pNext;
1101     }
1102     if (x >= run_x && x < run_x+width)
1103     {
1104       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
1105       ME_String *s = pNext->member.run.strText;
1106       if (ch < s->nLen) {
1107         if (pOffset)
1108           *pOffset = ch;
1109         return pNext;
1110       }
1111     }
1112     pLastRun = pNext;
1113     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
1114   } while(pNext && pNext->type == diRun);
1115
1116   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
1117   {
1118     pNext = ME_FindItemFwd(pNext, diRun);
1119     if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
1120     return pNext;
1121   } else {
1122     return pLastRun;
1123   }
1124 }
1125
1126 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1127 {
1128   ME_DisplayItem *pRun = pCursor->pRun;
1129   int x;
1130
1131   if (editor->nUDArrowX != -1)
1132     x = editor->nUDArrowX;
1133   else {
1134     if (editor->bCaretAtEnd)
1135     {
1136       pRun = ME_FindItemBack(pRun, diRun);
1137       assert(pRun);
1138       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1139     }
1140     else {
1141       x = pRun->member.run.pt.x;
1142       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
1143     }
1144     editor->nUDArrowX = x;
1145   }
1146   return x;
1147 }
1148
1149
1150 static void
1151 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1152 {
1153   ME_DisplayItem *pRun = pCursor->pRun;
1154   ME_DisplayItem *pItem;
1155   int x = ME_GetXForArrow(editor, pCursor);
1156
1157   if (editor->bCaretAtEnd && !pCursor->nOffset)
1158     pRun = ME_FindItemBack(pRun, diRun);
1159   if (!pRun)
1160     return;
1161   if (nRelOfs == -1)
1162   {
1163     /* start of this row */
1164     pItem = ME_FindItemBack(pRun, diStartRow);
1165     assert(pItem);
1166     /* start of the previous row */
1167     pItem = ME_FindItemBack(pItem, diStartRow);
1168   }
1169   else
1170   {
1171     /* start of the next row */
1172     pItem = ME_FindItemFwd(pRun, diStartRow);
1173     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
1174     */
1175   }
1176   if (!pItem)
1177   {
1178     /* row not found - ignore */
1179     return;
1180   }
1181   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1182   assert(pCursor->pRun);
1183   assert(pCursor->pRun->type == diRun);
1184 }
1185
1186
1187 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1188 {
1189   ME_DisplayItem *pRun = pCursor->pRun;
1190   ME_DisplayItem *pLast, *p;
1191   int x, y, ys, yd, yp, yprev;
1192   ME_Cursor tmp_curs = *pCursor;
1193
1194   x = ME_GetXForArrow(editor, pCursor);
1195   if (!pCursor->nOffset && editor->bCaretAtEnd)
1196     pRun = ME_FindItemBack(pRun, diRun);
1197
1198   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1199   assert(p->type == diStartRow);
1200   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1201   yprev = ys = y = yp + p->member.row.nYPos;
1202   yd = y - editor->sizeWindow.cy;
1203   pLast = p;
1204
1205   do {
1206     p = ME_FindItemBack(p, diStartRowOrParagraph);
1207     if (!p)
1208       break;
1209     if (p->type == diParagraph) { /* crossing paragraphs */
1210       if (p->member.para.prev_para == NULL)
1211         break;
1212       yp = p->member.para.prev_para->member.para.nYPos;
1213       continue;
1214     }
1215     y = yp + p->member.row.nYPos;
1216     if (y < yd)
1217       break;
1218     pLast = p;
1219     yprev = y;
1220   } while(1);
1221
1222   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1223   ME_UpdateSelection(editor, &tmp_curs);
1224   if (yprev < editor->sizeWindow.cy)
1225   {
1226     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1227     ME_Repaint(editor);
1228   }
1229   else
1230   {
1231     ME_ScrollUp(editor, ys-yprev);
1232   }
1233   assert(pCursor->pRun);
1234   assert(pCursor->pRun->type == diRun);
1235 }
1236
1237 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1238    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1239    In such a situation, clicking the scrollbar restores its position back to the
1240    normal range (ie. sets it to (doclength-screenheight)). */
1241
1242 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1243 {
1244   ME_DisplayItem *pRun = pCursor->pRun;
1245   ME_DisplayItem *pLast, *p;
1246   int x, y, ys, yd, yp, yprev;
1247   ME_Cursor tmp_curs = *pCursor;
1248
1249   x = ME_GetXForArrow(editor, pCursor);
1250   if (!pCursor->nOffset && editor->bCaretAtEnd)
1251     pRun = ME_FindItemBack(pRun, diRun);
1252
1253   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1254   assert(p->type == diStartRow);
1255   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1256   yprev = ys = y = yp + p->member.row.nYPos;
1257   yd = y + editor->sizeWindow.cy;
1258   pLast = p;
1259
1260   do {
1261     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1262     if (!p)
1263       break;
1264     if (p->type == diParagraph) {
1265       yp = p->member.para.nYPos;
1266       continue;
1267     }
1268     y = yp + p->member.row.nYPos;
1269     if (y >= yd)
1270       break;
1271     pLast = p;
1272     yprev = y;
1273   } while(1);
1274
1275   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1276   ME_UpdateSelection(editor, &tmp_curs);
1277   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1278   {
1279     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1280     ME_Repaint(editor);
1281   }
1282   else
1283   {
1284     ME_ScrollUp(editor,ys-yprev);
1285   }
1286   assert(pCursor->pRun);
1287   assert(pCursor->pRun->type == diRun);
1288 }
1289
1290 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1291 {
1292   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1293   ME_WrapMarkedParagraphs(editor);
1294   if (pRow) {
1295     ME_DisplayItem *pRun;
1296     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1297       pRow = ME_FindItemBack(pRow, diStartRow);
1298       if (!pRow)
1299         return;
1300     }
1301     pRun = ME_FindItemFwd(pRow, diRun);
1302     if (pRun) {
1303       pCursor->pRun = pRun;
1304       pCursor->nOffset = 0;
1305     }
1306   }
1307   editor->bCaretAtEnd = FALSE;
1308 }
1309
1310 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1311 {
1312   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1313   if (pRow) {
1314     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1315     if (pRun) {
1316       pCursor->pRun = pRun;
1317       pCursor->nOffset = 0;
1318     }
1319   }
1320 }
1321
1322 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1323 {
1324   ME_DisplayItem *pRow;
1325
1326   if (editor->bCaretAtEnd && !pCursor->nOffset)
1327     return;
1328
1329   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1330   assert(pRow);
1331   if (pRow->type == diStartRow) {
1332     /* FIXME WTF was I thinking about here ? */
1333     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1334     assert(pRun);
1335     pCursor->pRun = pRun;
1336     pCursor->nOffset = 0;
1337     editor->bCaretAtEnd = 1;
1338     return;
1339   }
1340   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1341   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1342   pCursor->nOffset = 0;
1343   editor->bCaretAtEnd = FALSE;
1344 }
1345
1346 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1347 {
1348   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1349   assert(p);
1350   p = ME_FindItemBack(p, diRun);
1351   assert(p);
1352   assert(p->member.run.nFlags & MERF_ENDPARA);
1353   pCursor->pRun = p;
1354   pCursor->nOffset = 0;
1355   editor->bCaretAtEnd = FALSE;
1356 }
1357
1358 BOOL ME_IsSelection(ME_TextEditor *editor)
1359 {
1360   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1361 }
1362
1363 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1364 {
1365   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1366
1367   if (cdir*dir>0)
1368     return 0;
1369   else
1370     return 1;
1371 }
1372
1373 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1374 {
1375   ME_Cursor old_anchor = editor->pCursors[1];
1376
1377   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1378   {
1379     /* any selection was present ? if so, it's no more, repaint ! */
1380     editor->pCursors[1] = editor->pCursors[0];
1381     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1382       return TRUE;
1383     }
1384     return FALSE;
1385   }
1386   else
1387   {
1388     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1389     {
1390       editor->pCursors[1] = *pTempCursor;
1391       return TRUE;
1392     }
1393   }
1394
1395   ME_Repaint(editor);
1396   return TRUE;
1397 }
1398
1399 void ME_DeleteSelection(ME_TextEditor *editor)
1400 {
1401   int from, to;
1402   ME_GetSelection(editor, &from, &to);
1403   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1404 }
1405
1406 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1407 {
1408   return ME_GetInsertStyle(editor, 0);
1409 }
1410
1411 void ME_SendSelChange(ME_TextEditor *editor)
1412 {
1413   SELCHANGE sc;
1414
1415   if (!(editor->nEventMask & ENM_SELCHANGE))
1416     return;
1417
1418   sc.nmhdr.hwndFrom = editor->hWnd;
1419   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1420   sc.nmhdr.code = EN_SELCHANGE;
1421   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1422   sc.seltyp = SEL_EMPTY;
1423   if (sc.chrg.cpMin != sc.chrg.cpMax)
1424     sc.seltyp |= SEL_TEXT;
1425   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1426     sc.seltyp |= SEL_MULTICHAR;
1427   TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1428     sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1429     (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1430     (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1431   if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1432   {
1433     ME_ClearTempStyle(editor);
1434
1435     editor->notified_cr = sc.chrg;
1436     SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1437   }
1438 }
1439
1440 BOOL
1441 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1442 {
1443   int nCursor = 0;
1444   ME_Cursor *p = &editor->pCursors[nCursor];
1445   ME_Cursor tmp_curs = *p;
1446   BOOL success = FALSE;
1447
1448   ME_CheckCharOffsets(editor);
1449   switch(nVKey) {
1450     case VK_LEFT:
1451       editor->bCaretAtEnd = 0;
1452       if (ctrl)
1453         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1454       else
1455         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1456       break;
1457     case VK_RIGHT:
1458       editor->bCaretAtEnd = 0;
1459       if (ctrl)
1460         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1461       else
1462         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1463       break;
1464     case VK_UP:
1465       ME_MoveCursorLines(editor, &tmp_curs, -1);
1466       break;
1467     case VK_DOWN:
1468       ME_MoveCursorLines(editor, &tmp_curs, +1);
1469       break;
1470     case VK_PRIOR:
1471       ME_ArrowPageUp(editor, &tmp_curs);
1472       break;
1473     case VK_NEXT:
1474       ME_ArrowPageDown(editor, &tmp_curs);
1475       break;
1476     case VK_HOME: {
1477       if (ctrl)
1478         ME_ArrowCtrlHome(editor, &tmp_curs);
1479       else
1480         ME_ArrowHome(editor, &tmp_curs);
1481       editor->bCaretAtEnd = 0;
1482       break;
1483     }
1484     case VK_END:
1485       if (ctrl)
1486         ME_ArrowCtrlEnd(editor, &tmp_curs);
1487       else
1488         ME_ArrowEnd(editor, &tmp_curs);
1489       break;
1490   }
1491
1492   if (!extend)
1493     editor->pCursors[1] = tmp_curs;
1494   *p = tmp_curs;
1495
1496   ME_InvalidateSelection(editor);
1497   ME_Repaint(editor);
1498   HideCaret(editor->hWnd);
1499   ME_EnsureVisible(editor, tmp_curs.pRun);
1500   ME_ShowCaret(editor);
1501   ME_SendSelChange(editor);
1502   return success;
1503 }