dlls/riched20/caret.c

   1 /*
   2  * RichEdit - Caret and selection functions.
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  * Copyright 2005 by Phil Krylov
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22
  23 #include "editor.h"
  24
  25 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  26
  27 static BOOL
  28 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs);
  29
  30
  31 void ME_GetSelection(ME_TextEditor *editor, int *from, int *to)
  32 {
  33   *from = ME_GetCursorOfs(editor, 0);
  34   *to =   ME_GetCursorOfs(editor, 1);
  35
  36   if (*from > *to)
  37   {
  38     int tmp = *from;
  39     *from = *to;
  40     *to = tmp;
  41   }
  42 }
  43
  44 int ME_GetTextLength(ME_TextEditor *editor)
  45 {
  46   return ME_CharOfsFromRunOfs(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun), 0);
  47 }
  48
  49
  50 int ME_GetTextLengthEx(ME_TextEditor *editor, GETTEXTLENGTHEX *how)
  51 {
  52   int length;
  53
  54   if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
  55     return E_INVALIDARG;
  56   if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
  57     return E_INVALIDARG;
  58
  59   length = ME_GetTextLength(editor);
  60
  61   if (how->flags & GTL_USECRLF)
  62     length += editor->nParagraphs;
  63
  64   if (how->flags & GTL_NUMBYTES)
  65   {
  66     CPINFO cpinfo;
  67
  68     if (how->codepage == 1200)
  69       return length * 2;
  70     if (how->flags & GTL_PRECISE)
  71       FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
  72     if (GetCPInfo(how->codepage, &cpinfo))
  73       return length * cpinfo.MaxCharSize;
  74     ERR("Invalid codepage %u\n", how->codepage);
  75     return E_INVALIDARG;
  76   }
  77   return length;
  78 }
  79
  80
  81 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
  82 {
  83   int selectionEnd = 0;
  84   const int len = ME_GetTextLength(editor);
  85
  86   /* all negative values are effectively the same */
  87   if (from < 0)
  88     from = -1;
  89   if (to < 0)
  90     to = -1;
  91
  92   /* select all */
  93   if (from == 0 && to == -1)
  94   {
  95     editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
  96     editor->pCursors[1].nOffset = 0;
  97     editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  98     editor->pCursors[0].nOffset = 0;
  99     ME_InvalidateSelection(editor);
 100     ME_ClearTempStyle(editor);
 101     return len + 1;
 102   }
 103
 104   /* if both values are equal and also out of bound, that means to */
 105   /* put the selection at the end of the text */
 106   if ((from == to) && (to < 0 || to > len))
 107   {
 108     selectionEnd = 1;
 109   }
 110   else
 111   {
 112     /* if from is negative and to is positive then selection is */
 113     /* deselected and caret moved to end of the current selection */
 114     if (from < 0)
 115     {
 116       int start, end;
 117       ME_GetSelection(editor, &start, &end);
 118       editor->pCursors[1] = editor->pCursors[0];
 119       ME_Repaint(editor);
 120       ME_ClearTempStyle(editor);
 121       return end;
 122     }
 123
 124     /* adjust to if it's a negative value */
 125     if (to < 0)
 126       to = len + 1;
 127
 128     /* flip from and to if they are reversed */
 129     if (from>to)
 130     {
 131       int tmp = from;
 132       from = to;
 133       to = tmp;
 134     }
 135
 136     /* after fiddling with the values, we find from > len && to > len */
 137     if (from > len)
 138       selectionEnd = 1;
 139     /* special case with to too big */
 140     else if (to > len)
 141       to = len + 1;
 142   }
 143
 144   if (selectionEnd)
 145   {
 146     editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 147     editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
 148     ME_InvalidateSelection(editor);
 149     ME_ClearTempStyle(editor);
 150     return len;
 151   }
 152
 153   ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
 154   ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
 155   return to;
 156 }
 157
 158
 159 void
 160 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
 161                         int *x, int *y, int *height)
 162 {
 163   ME_DisplayItem *pCursorRun = pCursor->pRun;
 164   ME_DisplayItem *pSizeRun = pCursor->pRun;
 165
 166   assert(!pCursor->nOffset || !editor->bCaretAtEnd);
 167   assert(height && x && y);
 168   assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
 169   assert(pCursor->pRun);
 170   assert(pCursor->pRun->type == diRun);
 171
 172   if (pCursorRun->type == diRun) {
 173     ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
 174
 175     if (row) {
 176       HDC hDC = GetDC(editor->hWnd);
 177       ME_Context c;
 178       ME_DisplayItem *run = pCursorRun;
 179       ME_DisplayItem *para = NULL;
 180       SIZE sz = {0, 0};
 181
 182       ME_InitContext(&c, editor, hDC);
 183
 184       if (!pCursor->nOffset && !editor->bCaretAtEnd)
 185       {
 186         ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrStartRow);
 187         assert(prev);
 188         if (prev->type == diRun)
 189           pSizeRun = prev;
 190       }
 191       assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
 192       para = ME_FindItemBack(row, diParagraph);
 193       assert(para);
 194       assert(para->type == diParagraph);
 195       if (editor->bCaretAtEnd && !pCursor->nOffset &&
 196           run == ME_FindItemFwd(row, diRun))
 197       {
 198         ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
 199         assert(tmp);
 200         if (tmp->type == diRun)
 201         {
 202           row = ME_FindItemBack(tmp, diStartRow);
 203           pSizeRun = run = tmp;
 204           assert(run);
 205           assert(run->type == diRun);
 206           sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, ME_StrLen(run->member.run.strText));
 207         }
 208       }
 209       if (pCursor->nOffset && !(run->member.run.nFlags & MERF_SKIPPED)) {
 210         sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset);
 211       }
 212
 213       *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
 214       *x = run->member.run.pt.x + sz.cx;
 215       *y = para->member.para.nYPos + row->member.row.nBaseline + pSizeRun->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
 216
 217       ME_DestroyContext(&c);
 218       ReleaseDC(editor->hWnd, hDC);
 219       return;
 220     }
 221   }
 222   *height = 10; /* FIXME use global font */
 223   *x = 0;
 224   *y = 0;
 225 }
 226
 227
 228 void
 229 ME_MoveCaret(ME_TextEditor *editor)
 230 {
 231   int x, y, height;
 232
 233   ME_WrapMarkedParagraphs(editor);
 234   ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
 235   CreateCaret(editor->hWnd, NULL, 0, height);
 236   SetCaretPos(x, y);
 237 }
 238
 239
 240 void ME_ShowCaret(ME_TextEditor *ed)
 241 {
 242   ME_MoveCaret(ed);
 243   ShowCaret(ed->hWnd);
 244 }
 245
 246 void ME_HideCaret(ME_TextEditor *ed)
 247 {
 248   HideCaret(ed->hWnd);
 249   DestroyCaret();
 250 }
 251
 252 void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
 253   int nChars)
 254 {
 255   ME_Cursor c;
 256   int shift = 0;
 257
 258   while(nChars > 0)
 259   {
 260     ME_Run *run;
 261     ME_CursorFromCharOfs(editor, nOfs, &c);
 262     run = &c.pRun->member.run;
 263     if (run->nFlags & MERF_ENDPARA) {
 264       if (!ME_FindItemFwd(c.pRun, diParagraph))
 265       {
 266         return;
 267       }
 268       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 269       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 270       ME_CheckCharOffsets(editor);
 271       nChars--;
 272       if (editor->bEmulateVersion10 && nChars)
 273         nChars--;
 274       continue;
 275     }
 276     else
 277     {
 278       ME_Cursor cursor;
 279       int nIntendedChars = nChars;
 280       int nCharsToDelete = nChars;
 281       int i;
 282       int loc = c.nOffset;
 283
 284       ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
 285
 286       cursor = c;
 287       ME_StrRelPos(run->strText, loc, &nChars);
 288       /* nChars is the number of characters that should be deleted from the
 289          FOLLOWING runs (these AFTER cursor.pRun)
 290          nCharsToDelete is a number of chars to delete from THIS run */
 291       nCharsToDelete -= nChars;
 292       shift -= nCharsToDelete;
 293       TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
 294         nCharsToDelete, nIntendedChars, nChars, c.nOffset,
 295         debugstr_w(run->strText->szData), run->strText->nLen);
 296
 297       if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
 298       {
 299         /* undo = reinsert whole run */
 300         /* nOfs is a character offset (from the start of the document
 301            to the current (deleted) run */
 302         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 303         if (pUndo)
 304           pUndo->di.member.run.nCharOfs = nOfs;
 305       }
 306       else
 307       {
 308         /* undo = reinsert partial run */
 309         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 310         if (pUndo) {
 311           ME_DestroyString(pUndo->di.member.run.strText);
 312           pUndo->di.member.run.nCharOfs = nOfs;
 313           pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
 314         }
 315       }
 316       TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
 317       TRACE("Shift value: %d\n", shift);
 318       ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
 319
 320       /* update cursors (including c) */
 321       for (i=-1; i<editor->nCursors; i++) {
 322         ME_Cursor *pThisCur = editor->pCursors + i;
 323         if (i == -1) pThisCur = &c;
 324         if (pThisCur->pRun == cursor.pRun) {
 325           if (pThisCur->nOffset > cursor.nOffset) {
 326             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 327               pThisCur->nOffset = cursor.nOffset;
 328             else
 329               pThisCur->nOffset -= nCharsToDelete;
 330             assert(pThisCur->nOffset >= 0);
 331             assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
 332           }
 333           if (pThisCur->nOffset == ME_StrVLen(run->strText))
 334           {
 335             pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
 336             assert(pThisCur->pRun->type == diRun);
 337             pThisCur->nOffset = 0;
 338           }
 339         }
 340       }
 341
 342       /* c = updated data now */
 343
 344       if (c.pRun == cursor.pRun)
 345         ME_SkipAndPropagateCharOffset(c.pRun, shift);
 346       else
 347         ME_PropagateCharOffset(c.pRun, shift);
 348
 349       if (!ME_StrVLen(cursor.pRun->member.run.strText))
 350       {
 351         TRACE("Removing useless run\n");
 352         ME_Remove(cursor.pRun);
 353         ME_DestroyDisplayItem(cursor.pRun);
 354       }
 355
 356       shift = 0;
 357       /*
 358       ME_CheckCharOffsets(editor);
 359       */
 360       continue;
 361     }
 362   }
 363 }
 364
 365 void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
 366   int nChars)
 367 {
 368   assert(nCursor>=0 && nCursor<editor->nCursors);
 369   ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
 370 }
 371
 372 static ME_DisplayItem *
 373 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 374                                 const WCHAR *str, int len, ME_Style *style,
 375                                 int flags)
 376 {
 377   ME_Cursor *p = &editor->pCursors[nCursor];
 378
 379   editor->bCaretAtEnd = FALSE;
 380
 381   assert(p->pRun->type == diRun);
 382
 383   return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
 384 }
 385
 386
 387 /* FIXME this is temporary, just to have something to test how bad graphics handler is */
 388 void ME_InsertGraphicsFromCursor(ME_TextEditor *editor, int nCursor)
 389 {
 390   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 391   WCHAR space = ' ';
 392
 393   /* FIXME no no no */
 394   if (ME_IsSelection(editor))
 395     ME_DeleteSelection(editor);
 396
 397   ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 398                                   MERF_GRAPHICS);
 399   ME_SendSelChange(editor);
 400 }
 401
 402
 403 void
 404 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 405 {
 406   WCHAR tab = '\t';
 407   ME_DisplayItem *p, *run;
 408   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 409
 410   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 411                                       MERF_CELL);
 412   run = p;
 413   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 414   {
 415     if (run->member.run.nFlags & MERF_CELL)
 416     {
 417       assert(run->member.run.pCell->next);
 418       p->member.run.pCell = run->member.run.pCell->next;
 419       return;
 420     }
 421   }
 422   assert(run->type == diParagraph);
 423   assert(run->member.para.bTable);
 424   assert(run->member.para.pCells);
 425   p->member.run.pCell = run->member.para.pCells;
 426 }
 427
 428
 429 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 430   const WCHAR *str, int len, ME_Style *style)
 431 {
 432   const WCHAR *pos;
 433   ME_Cursor *p = NULL;
 434   /* FIXME: is this too slow? */
 435   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 436   int freeSpace = editor->nTextLimit - ME_GetTextLength(editor);
 437
 438   /* text operations set modified state */
 439   editor->nModifyStep = 1;
 440
 441   assert(style);
 442
 443   /* FIXME really HERE ? */
 444   if (ME_IsSelection(editor))
 445     ME_DeleteSelection(editor);
 446
 447   assert(nCursor>=0 && nCursor<editor->nCursors);
 448   if (len == -1)
 449     len = lstrlenW(str);
 450   len = min(len, freeSpace);
 451   while (len)
 452   {
 453     pos = str;
 454     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 455     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 456       pos++;
 457     if (pos-str < len && *pos == '\t') { /* handle tabs */
 458       WCHAR tab = '\t';
 459
 460       if (pos!=str)
 461         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 462
 463       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 464
 465       pos++;
 466       if(pos-str <= len) {
 467         len -= pos - str;
 468         str = pos;
 469         continue;
 470       }
 471     }
 472     if (pos-str < len) {   /* handle EOLs */
 473       ME_DisplayItem *tp, *end_run;
 474       ME_Style *tmp_style;
 475       if (pos!=str)
 476         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 477       p = &editor->pCursors[nCursor];
 478       if (p->nOffset) {
 479         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 480         p = &editor->pCursors[nCursor];
 481       }
 482       tmp_style = ME_GetInsertStyle(editor, nCursor);
 483       /* ME_SplitParagraph increases style refcount */
 484       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style);
 485       p->pRun = ME_FindItemFwd(tp, diRun);
 486       end_run = ME_FindItemBack(tp, diRun);
 487       ME_ReleaseStyle(end_run->member.run.style);
 488       end_run->member.run.style = tmp_style;
 489       p->nOffset = 0;
 490       if(pos-str < len && *pos =='\r')
 491         pos++;
 492       if(pos-str < len && *pos =='\n')
 493         pos++;
 494       if(pos-str <= len) {
 495         len -= pos - str;
 496         str = pos;
 497         continue;
 498       }
 499     }
 500     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 501     len = 0;
 502   }
 503 }
 504
 505
 506 static BOOL
 507 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 508 {
 509   ME_DisplayItem *pRun = pCursor->pRun;
 510
 511   if (nRelOfs == -1)
 512   {
 513     if (!pCursor->nOffset)
 514     {
 515       do {
 516         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 517         assert(pRun);
 518         switch (pRun->type)
 519         {
 520           case diRun:
 521             break;
 522           case diParagraph:
 523             if (pRun->member.para.prev_para->type == diTextStart)
 524               return FALSE;
 525             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 526             /* every paragraph ought to have at least one run */
 527             assert(pRun && pRun->type == diRun);
 528             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 529             break;
 530           default:
 531             assert(pRun->type != diRun && pRun->type != diParagraph);
 532             return FALSE;
 533         }
 534       } while (RUN_IS_HIDDEN(&pRun->member.run));
 535       pCursor->pRun = pRun;
 536       if (pRun->member.run.nFlags & MERF_ENDPARA)
 537         pCursor->nOffset = 0;
 538       else
 539         pCursor->nOffset = pRun->member.run.strText->nLen;
 540     }
 541
 542     if (pCursor->nOffset)
 543       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 544     return TRUE;
 545   }
 546   else
 547   {
 548     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 549     {
 550       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 551
 552       if (new_ofs < pRun->member.run.strText->nLen)
 553       {
 554         pCursor->nOffset = new_ofs;
 555         return TRUE;
 556       }
 557     }
 558     do {
 559       pRun = ME_FindItemFwd(pRun, diRun);
 560     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 561     if (pRun)
 562     {
 563       pCursor->pRun = pRun;
 564       pCursor->nOffset = 0;
 565       return TRUE;
 566     }
 567   }
 568   return FALSE;
 569 }
 570
 571
 572 static BOOL
 573 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 574 {
 575   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 576   int nOffset = cursor->nOffset;
 577
 578   if (nRelOfs == -1)
 579   {
 580     /* Backward movement */
 581     while (TRUE)
 582     {
 583       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 584                                      nOffset, WB_MOVEWORDLEFT);
 585        if (nOffset)
 586         break;
 587       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 588       if (pOtherRun->type == diRun)
 589       {
 590         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 591                                  pOtherRun->member.run.strText->nLen - 1,
 592                                  WB_ISDELIMITER)
 593             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 594             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 595             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 596                                      WB_ISDELIMITER))
 597           break;
 598         pRun = pOtherRun;
 599         nOffset = pOtherRun->member.run.strText->nLen;
 600       }
 601       else if (pOtherRun->type == diParagraph)
 602       {
 603         if (cursor->pRun == pRun && cursor->nOffset == 0)
 604         {
 605           /* Paragraph breaks are treated as separate words */
 606           if (pOtherRun->member.para.prev_para->type == diTextStart)
 607             return FALSE;
 608           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 609         }
 610         break;
 611       }
 612     }
 613   }
 614   else
 615   {
 616     /* Forward movement */
 617     BOOL last_delim = FALSE;
 618
 619     while (TRUE)
 620     {
 621       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 622                                               nOffset, WB_ISDELIMITER))
 623         break;
 624       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 625                                      nOffset, WB_MOVEWORDRIGHT);
 626       if (nOffset < pRun->member.run.strText->nLen)
 627         break;
 628       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 629       if (pOtherRun->type == diRun)
 630       {
 631         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 632                                           nOffset - 1, WB_ISDELIMITER);
 633         pRun = pOtherRun;
 634         nOffset = 0;
 635       }
 636       else if (pOtherRun->type == diParagraph)
 637       {
 638         if (cursor->pRun == pRun)
 639           pRun = ME_FindItemFwd(pOtherRun, diRun);
 640         nOffset = 0;
 641         break;
 642       }
 643       else /* diTextEnd */
 644       {
 645         if (cursor->pRun == pRun)
 646           return FALSE;
 647         nOffset = 0;
 648         break;
 649       }
 650     }
 651   }
 652   cursor->pRun = pRun;
 653   cursor->nOffset = nOffset;
 654   return TRUE;
 655 }
 656
 657
 658 void
 659 ME_SelectWord(ME_TextEditor *editor)
 660 {
 661   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 662     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 663   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 664   ME_InvalidateSelection(editor);
 665   ME_SendSelChange(editor);
 666 }
 667
 668
 669 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 670 {
 671   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 672
 673   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 674     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 675 }
 676
 677 int ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 678 {
 679   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 680   int rx = 0;
 681
 682   if (is_eol)
 683     *is_eol = 0;
 684
 685   while(p != editor->pBuffer->pLast)
 686   {
 687     if (p->type == diParagraph)
 688     {
 689       int ry = y - p->member.para.nYPos;
 690       if (ry < 0)
 691       {
 692         result->pRun = ME_FindItemFwd(p, diRun);
 693         result->nOffset = 0;
 694         return 0;
 695       }
 696       if (ry >= p->member.para.nHeight)
 697       {
 698         p = p->member.para.next_para;
 699         continue;
 700       }
 701       p = ME_FindItemFwd(p, diStartRow);
 702       y = ry;
 703       continue;
 704     }
 705     if (p->type == diStartRow)
 706     {
 707       int ry = y - p->member.row.nYPos;
 708       if (ry < 0)
 709         return 0;
 710       if (ry >= p->member.row.nHeight)
 711       {
 712         p = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 713         if (p->type != diStartRow)
 714           return 0;
 715         continue;
 716       }
 717       p = ME_FindItemFwd(p, diRun);
 718       continue;
 719     }
 720     if (p->type == diRun)
 721     {
 722       ME_DisplayItem *pp;
 723       rx = x - p->member.run.pt.x;
 724       if (rx < 0)
 725         rx = 0;
 726       if (rx >= p->member.run.nWidth) /* not this run yet... find next item */
 727       {
 728         pp = p;
 729         do {
 730           p = p->next;
 731           if (p->type == diRun)
 732           {
 733             rx = x - p->member.run.pt.x;
 734             goto continue_search;
 735           }
 736           if (p->type == diStartRow)
 737           {
 738             p = ME_FindItemFwd(p, diRun);
 739             if (is_eol)
 740               *is_eol = 1;
 741             rx = 0; /* FIXME not sure */
 742             goto found_here;
 743           }
 744           if (p->type == diParagraph || p->type == diTextEnd)
 745           {
 746             rx = 0; /* FIXME not sure */
 747             p = pp;
 748             goto found_here;
 749           }
 750         } while(1);
 751         continue;
 752       }
 753     found_here:
 754       if (p->member.run.nFlags & MERF_ENDPARA)
 755         rx = 0;
 756       result->pRun = p;
 757       result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 758       if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 759       {
 760         result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 761         result->nOffset = 0;
 762       }
 763       return 1;
 764     }
 765     assert(0);
 766   continue_search:
 767     ;
 768   }
 769   result->pRun = ME_FindItemBack(p, diRun);
 770   result->nOffset = 0;
 771   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 772   return 0;
 773 }
 774
 775
 776 int
 777 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 778 {
 779   ME_Cursor cursor;
 780   RECT rc;
 781
 782   GetClientRect(editor->hWnd, &rc);
 783   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 784     return -1;
 785   y += ME_GetYScrollPos(editor);
 786   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 787   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 788           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 789 }
 790
 791
 792 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 793 {
 794   ME_Cursor tmp_cursor;
 795   int is_selection = 0;
 796
 797   editor->nUDArrowX = -1;
 798
 799   y += ME_GetYScrollPos(editor);
 800
 801   tmp_cursor = editor->pCursors[0];
 802   is_selection = ME_IsSelection(editor);
 803
 804   ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 805
 806   if (GetKeyState(VK_SHIFT)>=0)
 807   {
 808     editor->pCursors[1] = editor->pCursors[0];
 809   }
 810   else
 811   {
 812     if (!is_selection) {
 813       editor->pCursors[1] = tmp_cursor;
 814       is_selection = 1;
 815     }
 816   }
 817   ME_InvalidateSelection(editor);
 818   HideCaret(editor->hWnd);
 819   ME_MoveCaret(editor);
 820   ShowCaret(editor->hWnd);
 821   ME_ClearTempStyle(editor);
 822   ME_SendSelChange(editor);
 823 }
 824
 825 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 826 {
 827   ME_Cursor tmp_cursor;
 828
 829   y += ME_GetYScrollPos(editor);
 830
 831   tmp_cursor = editor->pCursors[0];
 832   /* FIXME: do something with the return value of ME_FindPixelPos */
 833   ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 834
 835   if (tmp_cursor.pRun == editor->pCursors[0].pRun &&
 836       tmp_cursor.nOffset == editor->pCursors[0].nOffset)
 837     return;
 838
 839   ME_InvalidateSelection(editor);
 840   editor->pCursors[0] = tmp_cursor;
 841   HideCaret(editor->hWnd);
 842   ME_MoveCaret(editor);
 843   ME_InvalidateSelection(editor);
 844   ShowCaret(editor->hWnd);
 845   ME_SendSelChange(editor);
 846 }
 847
 848 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 849                                 int x, int *pOffset, int *pbCaretAtEnd)
 850 {
 851   ME_DisplayItem *pNext, *pLastRun;
 852   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 853   assert(pNext->type == diRun);
 854   pLastRun = pNext;
 855   *pbCaretAtEnd = FALSE;
 856   do {
 857     int run_x = pNext->member.run.pt.x;
 858     int width = pNext->member.run.nWidth;
 859     if (x < run_x)
 860     {
 861       if (pOffset) *pOffset = 0;
 862       return pNext;
 863     }
 864     if (x >= run_x && x < run_x+width)
 865     {
 866       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 867       ME_String *s = pNext->member.run.strText;
 868       if (ch < s->nLen) {
 869         if (pOffset)
 870           *pOffset = ch;
 871         return pNext;
 872       }
 873     }
 874     pLastRun = pNext;
 875     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
 876   } while(pNext && pNext->type == diRun);
 877
 878   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
 879   {
 880     pNext = ME_FindItemFwd(pNext, diRun);
 881     if (pbCaretAtEnd) *pbCaretAtEnd = 1;
 882     if (pOffset) *pOffset = 0;
 883     return pNext;
 884   } else {
 885     if (pbCaretAtEnd) *pbCaretAtEnd = 0;
 886     if (pOffset) *pOffset = 0;
 887     return pLastRun;
 888   }
 889 }
 890
 891 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
 892 {
 893   ME_DisplayItem *pRun = pCursor->pRun;
 894   int x;
 895
 896   if (editor->nUDArrowX != -1)
 897     x = editor->nUDArrowX;
 898   else {
 899     if (editor->bCaretAtEnd)
 900     {
 901       pRun = ME_FindItemBack(pRun, diRun);
 902       assert(pRun);
 903       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
 904     }
 905     else {
 906       x = pRun->member.run.pt.x;
 907       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
 908     }
 909     editor->nUDArrowX = x;
 910   }
 911   return x;
 912 }
 913
 914
 915 static void
 916 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 917 {
 918   ME_DisplayItem *pRun = pCursor->pRun;
 919   ME_DisplayItem *pItem;
 920   int x = ME_GetXForArrow(editor, pCursor);
 921
 922   if (editor->bCaretAtEnd && !pCursor->nOffset)
 923     pRun = ME_FindItemBack(pRun, diRun);
 924   if (!pRun)
 925     return;
 926   if (nRelOfs == -1)
 927   {
 928     /* start of this row */
 929     pItem = ME_FindItemBack(pRun, diStartRow);
 930     assert(pItem);
 931     /* start of the previous row */
 932     pItem = ME_FindItemBack(pItem, diStartRow);
 933   }
 934   else
 935   {
 936     /* start of the next row */
 937     pItem = ME_FindItemFwd(pRun, diStartRow);
 938     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
 939     */
 940   }
 941   if (!pItem)
 942   {
 943     /* row not found - ignore */
 944     return;
 945   }
 946   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
 947   assert(pCursor->pRun);
 948   assert(pCursor->pRun->type == diRun);
 949 }
 950
 951
 952 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
 953 {
 954   ME_DisplayItem *pRun = pCursor->pRun;
 955   ME_DisplayItem *pLast, *p;
 956   int x, y, ys, yd, yp, yprev;
 957   ME_Cursor tmp_curs = *pCursor;
 958
 959   x = ME_GetXForArrow(editor, pCursor);
 960   if (!pCursor->nOffset && editor->bCaretAtEnd)
 961     pRun = ME_FindItemBack(pRun, diRun);
 962
 963   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
 964   assert(p->type == diStartRow);
 965   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
 966   yprev = ys = y = yp + p->member.row.nYPos;
 967   yd = y - editor->sizeWindow.cy;
 968   pLast = p;
 969
 970   do {
 971     p = ME_FindItemBack(p, diStartRowOrParagraph);
 972     if (!p)
 973       break;
 974     if (p->type == diParagraph) { /* crossing paragraphs */
 975       if (p->member.para.prev_para == NULL)
 976         break;
 977       yp = p->member.para.prev_para->member.para.nYPos;
 978       continue;
 979     }
 980     y = yp + p->member.row.nYPos;
 981     if (y < yd)
 982       break;
 983     pLast = p;
 984     yprev = y;
 985   } while(1);
 986
 987   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
 988   ME_UpdateSelection(editor, &tmp_curs);
 989   if (yprev < editor->sizeWindow.cy)
 990   {
 991     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
 992     ME_Repaint(editor);
 993   }
 994   else
 995   {
 996     ME_ScrollUp(editor, ys-yprev);
 997   }
 998   assert(pCursor->pRun);
 999   assert(pCursor->pRun->type == diRun);
1000 }
1001
1002 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1003    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1004    In such a situation, clicking the scrollbar restores its position back to the
1005    normal range (ie. sets it to (doclength-screenheight)). */
1006
1007 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1008 {
1009   ME_DisplayItem *pRun = pCursor->pRun;
1010   ME_DisplayItem *pLast, *p;
1011   int x, y, ys, yd, yp, yprev;
1012   ME_Cursor tmp_curs = *pCursor;
1013
1014   x = ME_GetXForArrow(editor, pCursor);
1015   if (!pCursor->nOffset && editor->bCaretAtEnd)
1016     pRun = ME_FindItemBack(pRun, diRun);
1017
1018   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1019   assert(p->type == diStartRow);
1020   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1021   yprev = ys = y = yp + p->member.row.nYPos;
1022   yd = y + editor->sizeWindow.cy;
1023   pLast = p;
1024
1025   do {
1026     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1027     if (!p)
1028       break;
1029     if (p->type == diParagraph) {
1030       yp = p->member.para.nYPos;
1031       continue;
1032     }
1033     y = yp + p->member.row.nYPos;
1034     if (y >= yd)
1035       break;
1036     pLast = p;
1037     yprev = y;
1038   } while(1);
1039
1040   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1041   ME_UpdateSelection(editor, &tmp_curs);
1042   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1043   {
1044     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1045     ME_Repaint(editor);
1046   }
1047   else
1048   {
1049     ME_ScrollUp(editor,ys-yprev);
1050   }
1051   assert(pCursor->pRun);
1052   assert(pCursor->pRun->type == diRun);
1053 }
1054
1055 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1056 {
1057   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1058   /* bCaretAtEnd doesn't make sense if the cursor isn't set at the
1059   first character of the next row */
1060   assert(!editor->bCaretAtEnd || !pCursor->nOffset);
1061   ME_WrapMarkedParagraphs(editor);
1062   if (pRow) {
1063     ME_DisplayItem *pRun;
1064     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1065       pRow = ME_FindItemBack(pRow, diStartRow);
1066       if (!pRow)
1067         return;
1068     }
1069     pRun = ME_FindItemFwd(pRow, diRun);
1070     if (pRun) {
1071       pCursor->pRun = pRun;
1072       pCursor->nOffset = 0;
1073     }
1074   }
1075   editor->bCaretAtEnd = FALSE;
1076 }
1077
1078 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1079 {
1080   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1081   if (pRow) {
1082     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1083     if (pRun) {
1084       pCursor->pRun = pRun;
1085       pCursor->nOffset = 0;
1086     }
1087   }
1088 }
1089
1090 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1091 {
1092   ME_DisplayItem *pRow;
1093
1094   if (editor->bCaretAtEnd && !pCursor->nOffset)
1095     return;
1096
1097   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1098   assert(pRow);
1099   if (pRow->type == diStartRow) {
1100     /* FIXME WTF was I thinking about here ? */
1101     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1102     assert(pRun);
1103     pCursor->pRun = pRun;
1104     pCursor->nOffset = 0;
1105     editor->bCaretAtEnd = 1;
1106     return;
1107   }
1108   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1109   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1110   pCursor->nOffset = 0;
1111   editor->bCaretAtEnd = FALSE;
1112 }
1113
1114 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1115 {
1116   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1117   assert(p);
1118   p = ME_FindItemBack(p, diRun);
1119   assert(p);
1120   assert(p->member.run.nFlags & MERF_ENDPARA);
1121   pCursor->pRun = p;
1122   pCursor->nOffset = 0;
1123   editor->bCaretAtEnd = FALSE;
1124 }
1125
1126 BOOL ME_IsSelection(ME_TextEditor *editor)
1127 {
1128   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1129 }
1130
1131 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1132 {
1133   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1134
1135   if (cdir*dir>0)
1136     return 0;
1137   else
1138     return 1;
1139 }
1140
1141 BOOL ME_UpdateSelection(ME_TextEditor *editor, ME_Cursor *pTempCursor)
1142 {
1143   ME_Cursor old_anchor = editor->pCursors[1];
1144
1145   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1146   {
1147     /* any selection was present ? if so, it's no more, repaint ! */
1148     editor->pCursors[1] = editor->pCursors[0];
1149     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1150       return TRUE;
1151     }
1152     return FALSE;
1153   }
1154   else
1155   {
1156     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1157     {
1158       editor->pCursors[1] = *pTempCursor;
1159       return TRUE;
1160     }
1161   }
1162
1163   ME_Repaint(editor);
1164   return TRUE;
1165 }
1166
1167 void ME_DeleteSelection(ME_TextEditor *editor)
1168 {
1169   int from, to;
1170   ME_GetSelection(editor, &from, &to);
1171   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1172 }
1173
1174 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1175 {
1176   ME_Style *style;
1177   int from, to;
1178   ME_Cursor c;
1179
1180   ME_GetSelection(editor, &from, &to);
1181   ME_CursorFromCharOfs(editor, from, &c);
1182   if (from != to) {
1183     style = c.pRun->member.run.style;
1184     ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
1185   }
1186   else
1187     style = ME_GetInsertStyle(editor, 0);
1188   return style;
1189 }
1190
1191 void ME_SendSelChange(ME_TextEditor *editor)
1192 {
1193   SELCHANGE sc;
1194
1195   ME_ClearTempStyle(editor);
1196
1197   if (!(editor->nEventMask & ENM_SELCHANGE))
1198     return;
1199
1200   sc.nmhdr.hwndFrom = editor->hWnd;
1201   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1202   sc.nmhdr.code = EN_SELCHANGE;
1203   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1204   sc.seltyp = SEL_EMPTY;
1205   if (sc.chrg.cpMin != sc.chrg.cpMax)
1206     sc.seltyp |= SEL_TEXT;
1207   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1208     sc.seltyp |= SEL_MULTICHAR;
1209   SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1210 }
1211
1212
1213 BOOL
1214 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1215 {
1216   int nCursor = 0;
1217   ME_Cursor *p = &editor->pCursors[nCursor];
1218   ME_Cursor tmp_curs = *p;
1219   BOOL success = FALSE;
1220
1221   ME_CheckCharOffsets(editor);
1222   editor->nUDArrowX = -1;
1223   switch(nVKey) {
1224     case VK_LEFT:
1225       editor->bCaretAtEnd = 0;
1226       if (ctrl)
1227         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1228       else
1229         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1230       break;
1231     case VK_RIGHT:
1232       editor->bCaretAtEnd = 0;
1233       if (ctrl)
1234         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1235       else
1236         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1237       break;
1238     case VK_UP:
1239       ME_MoveCursorLines(editor, &tmp_curs, -1);
1240       break;
1241     case VK_DOWN:
1242       ME_MoveCursorLines(editor, &tmp_curs, +1);
1243       break;
1244     case VK_PRIOR:
1245       ME_ArrowPageUp(editor, &tmp_curs);
1246       break;
1247     case VK_NEXT:
1248       ME_ArrowPageDown(editor, &tmp_curs);
1249       break;
1250     case VK_HOME: {
1251       if (ctrl)
1252         ME_ArrowCtrlHome(editor, &tmp_curs);
1253       else
1254         ME_ArrowHome(editor, &tmp_curs);
1255       editor->bCaretAtEnd = 0;
1256       break;
1257     }
1258     case VK_END:
1259       if (ctrl)
1260         ME_ArrowCtrlEnd(editor, &tmp_curs);
1261       else
1262         ME_ArrowEnd(editor, &tmp_curs);
1263       break;
1264   }
1265
1266   if (!extend)
1267     editor->pCursors[1] = tmp_curs;
1268   *p = tmp_curs;
1269
1270   ME_InvalidateSelection(editor);
1271   ME_Repaint(editor);
1272   HideCaret(editor->hWnd);
1273   ME_EnsureVisible(editor, tmp_curs.pRun);
1274   ME_ShowCaret(editor);
1275   ME_SendSelChange(editor);
1276   return success;
1277 }