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   int freeSpace;
 435
 436   /* FIXME really HERE ? */
 437   if (ME_IsSelection(editor))
 438     ME_DeleteSelection(editor);
 439
 440   /* FIXME: is this too slow? */
 441   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 442   freeSpace = editor->nTextLimit - ME_GetTextLength(editor);
 443
 444   /* text operations set modified state */
 445   editor->nModifyStep = 1;
 446
 447   assert(style);
 448
 449   assert(nCursor>=0 && nCursor<editor->nCursors);
 450   if (len == -1)
 451     len = lstrlenW(str);
 452   len = min(len, freeSpace);
 453   while (len)
 454   {
 455     pos = str;
 456     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 457     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 458       pos++;
 459     if (pos-str < len && *pos == '\t') { /* handle tabs */
 460       WCHAR tab = '\t';
 461
 462       if (pos!=str)
 463         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 464
 465       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 466
 467       pos++;
 468       if(pos-str <= len) {
 469         len -= pos - str;
 470         str = pos;
 471         continue;
 472       }
 473     }
 474     if (pos-str < len) {   /* handle EOLs */
 475       ME_DisplayItem *tp, *end_run;
 476       ME_Style *tmp_style;
 477       if (pos!=str)
 478         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 479       p = &editor->pCursors[nCursor];
 480       if (p->nOffset) {
 481         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 482         p = &editor->pCursors[nCursor];
 483       }
 484       tmp_style = ME_GetInsertStyle(editor, nCursor);
 485       /* ME_SplitParagraph increases style refcount */
 486       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style);
 487       p->pRun = ME_FindItemFwd(tp, diRun);
 488       end_run = ME_FindItemBack(tp, diRun);
 489       ME_ReleaseStyle(end_run->member.run.style);
 490       end_run->member.run.style = tmp_style;
 491       p->nOffset = 0;
 492       if(pos-str < len && *pos =='\r')
 493         pos++;
 494       if(pos-str < len && *pos =='\n')
 495         pos++;
 496       if(pos-str <= len) {
 497         len -= pos - str;
 498         str = pos;
 499         continue;
 500       }
 501     }
 502     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 503     len = 0;
 504   }
 505 }
 506
 507
 508 static BOOL
 509 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 510 {
 511   ME_DisplayItem *pRun = pCursor->pRun;
 512
 513   if (nRelOfs == -1)
 514   {
 515     if (!pCursor->nOffset)
 516     {
 517       do {
 518         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 519         assert(pRun);
 520         switch (pRun->type)
 521         {
 522           case diRun:
 523             break;
 524           case diParagraph:
 525             if (pRun->member.para.prev_para->type == diTextStart)
 526               return FALSE;
 527             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 528             /* every paragraph ought to have at least one run */
 529             assert(pRun && pRun->type == diRun);
 530             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 531             break;
 532           default:
 533             assert(pRun->type != diRun && pRun->type != diParagraph);
 534             return FALSE;
 535         }
 536       } while (RUN_IS_HIDDEN(&pRun->member.run));
 537       pCursor->pRun = pRun;
 538       if (pRun->member.run.nFlags & MERF_ENDPARA)
 539         pCursor->nOffset = 0;
 540       else
 541         pCursor->nOffset = pRun->member.run.strText->nLen;
 542     }
 543
 544     if (pCursor->nOffset)
 545       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 546     return TRUE;
 547   }
 548   else
 549   {
 550     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 551     {
 552       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 553
 554       if (new_ofs < pRun->member.run.strText->nLen)
 555       {
 556         pCursor->nOffset = new_ofs;
 557         return TRUE;
 558       }
 559     }
 560     do {
 561       pRun = ME_FindItemFwd(pRun, diRun);
 562     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 563     if (pRun)
 564     {
 565       pCursor->pRun = pRun;
 566       pCursor->nOffset = 0;
 567       return TRUE;
 568     }
 569   }
 570   return FALSE;
 571 }
 572
 573
 574 static BOOL
 575 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 576 {
 577   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 578   int nOffset = cursor->nOffset;
 579
 580   if (nRelOfs == -1)
 581   {
 582     /* Backward movement */
 583     while (TRUE)
 584     {
 585       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 586                                      nOffset, WB_MOVEWORDLEFT);
 587        if (nOffset)
 588         break;
 589       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 590       if (pOtherRun->type == diRun)
 591       {
 592         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 593                                  pOtherRun->member.run.strText->nLen - 1,
 594                                  WB_ISDELIMITER)
 595             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 596             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 597             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 598                                      WB_ISDELIMITER))
 599           break;
 600         pRun = pOtherRun;
 601         nOffset = pOtherRun->member.run.strText->nLen;
 602       }
 603       else if (pOtherRun->type == diParagraph)
 604       {
 605         if (cursor->pRun == pRun && cursor->nOffset == 0)
 606         {
 607           /* Paragraph breaks are treated as separate words */
 608           if (pOtherRun->member.para.prev_para->type == diTextStart)
 609             return FALSE;
 610           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 611         }
 612         break;
 613       }
 614     }
 615   }
 616   else
 617   {
 618     /* Forward movement */
 619     BOOL last_delim = FALSE;
 620
 621     while (TRUE)
 622     {
 623       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 624                                               nOffset, WB_ISDELIMITER))
 625         break;
 626       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 627                                      nOffset, WB_MOVEWORDRIGHT);
 628       if (nOffset < pRun->member.run.strText->nLen)
 629         break;
 630       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 631       if (pOtherRun->type == diRun)
 632       {
 633         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 634                                           nOffset - 1, WB_ISDELIMITER);
 635         pRun = pOtherRun;
 636         nOffset = 0;
 637       }
 638       else if (pOtherRun->type == diParagraph)
 639       {
 640         if (cursor->pRun == pRun)
 641           pRun = ME_FindItemFwd(pOtherRun, diRun);
 642         nOffset = 0;
 643         break;
 644       }
 645       else /* diTextEnd */
 646       {
 647         if (cursor->pRun == pRun)
 648           return FALSE;
 649         nOffset = 0;
 650         break;
 651       }
 652     }
 653   }
 654   cursor->pRun = pRun;
 655   cursor->nOffset = nOffset;
 656   return TRUE;
 657 }
 658
 659
 660 void
 661 ME_SelectWord(ME_TextEditor *editor)
 662 {
 663   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 664     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 665   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 666   ME_InvalidateSelection(editor);
 667   ME_SendSelChange(editor);
 668 }
 669
 670
 671 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 672 {
 673   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 674
 675   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 676     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 677 }
 678
 679 int ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 680 {
 681   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 682   int rx = 0;
 683
 684   if (is_eol)
 685     *is_eol = 0;
 686
 687   while(p != editor->pBuffer->pLast)
 688   {
 689     if (p->type == diParagraph)
 690     {
 691       int ry = y - p->member.para.nYPos;
 692       if (ry < 0)
 693       {
 694         result->pRun = ME_FindItemFwd(p, diRun);
 695         result->nOffset = 0;
 696         return 0;
 697       }
 698       if (ry >= p->member.para.nHeight)
 699       {
 700         p = p->member.para.next_para;
 701         continue;
 702       }
 703       p = ME_FindItemFwd(p, diStartRow);
 704       y = ry;
 705       continue;
 706     }
 707     if (p->type == diStartRow)
 708     {
 709       int ry = y - p->member.row.nYPos;
 710       if (ry < 0)
 711         return 0;
 712       if (ry >= p->member.row.nHeight)
 713       {
 714         p = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 715         if (p->type != diStartRow)
 716           return 0;
 717         continue;
 718       }
 719       p = ME_FindItemFwd(p, diRun);
 720       continue;
 721     }
 722     if (p->type == diRun)
 723     {
 724       ME_DisplayItem *pp;
 725       rx = x - p->member.run.pt.x;
 726       if (rx < 0)
 727         rx = 0;
 728       if (rx >= p->member.run.nWidth) /* not this run yet... find next item */
 729       {
 730         pp = p;
 731         do {
 732           p = p->next;
 733           if (p->type == diRun)
 734           {
 735             rx = x - p->member.run.pt.x;
 736             goto continue_search;
 737           }
 738           if (p->type == diStartRow)
 739           {
 740             p = ME_FindItemFwd(p, diRun);
 741             if (is_eol)
 742               *is_eol = 1;
 743             rx = 0; /* FIXME not sure */
 744             goto found_here;
 745           }
 746           if (p->type == diParagraph || p->type == diTextEnd)
 747           {
 748             rx = 0; /* FIXME not sure */
 749             p = pp;
 750             goto found_here;
 751           }
 752         } while(1);
 753         continue;
 754       }
 755     found_here:
 756       if (p->member.run.nFlags & MERF_ENDPARA)
 757         rx = 0;
 758       result->pRun = p;
 759       result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 760       if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 761       {
 762         result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 763         result->nOffset = 0;
 764       }
 765       return 1;
 766     }
 767     assert(0);
 768   continue_search:
 769     ;
 770   }
 771   result->pRun = ME_FindItemBack(p, diRun);
 772   result->nOffset = 0;
 773   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 774   return 0;
 775 }
 776
 777
 778 int
 779 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 780 {
 781   ME_Cursor cursor;
 782   RECT rc;
 783
 784   GetClientRect(editor->hWnd, &rc);
 785   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 786     return -1;
 787   y += ME_GetYScrollPos(editor);
 788   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 789   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 790           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 791 }
 792
 793
 794 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 795 {
 796   ME_Cursor tmp_cursor;
 797   int is_selection = 0;
 798
 799   editor->nUDArrowX = -1;
 800
 801   y += ME_GetYScrollPos(editor);
 802
 803   tmp_cursor = editor->pCursors[0];
 804   is_selection = ME_IsSelection(editor);
 805
 806   ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 807
 808   if (GetKeyState(VK_SHIFT)>=0)
 809   {
 810     editor->pCursors[1] = editor->pCursors[0];
 811   }
 812   else
 813   {
 814     if (!is_selection) {
 815       editor->pCursors[1] = tmp_cursor;
 816       is_selection = 1;
 817     }
 818   }
 819   ME_InvalidateSelection(editor);
 820   HideCaret(editor->hWnd);
 821   ME_MoveCaret(editor);
 822   ShowCaret(editor->hWnd);
 823   ME_ClearTempStyle(editor);
 824   ME_SendSelChange(editor);
 825 }
 826
 827 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 828 {
 829   ME_Cursor tmp_cursor;
 830
 831   y += ME_GetYScrollPos(editor);
 832
 833   tmp_cursor = editor->pCursors[0];
 834   /* FIXME: do something with the return value of ME_FindPixelPos */
 835   ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 836
 837   if (tmp_cursor.pRun == editor->pCursors[0].pRun &&
 838       tmp_cursor.nOffset == editor->pCursors[0].nOffset)
 839     return;
 840
 841   ME_InvalidateSelection(editor);
 842   editor->pCursors[0] = tmp_cursor;
 843   HideCaret(editor->hWnd);
 844   ME_MoveCaret(editor);
 845   ME_InvalidateSelection(editor);
 846   ShowCaret(editor->hWnd);
 847   ME_SendSelChange(editor);
 848 }
 849
 850 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 851                                 int x, int *pOffset, int *pbCaretAtEnd)
 852 {
 853   ME_DisplayItem *pNext, *pLastRun;
 854   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 855   assert(pNext->type == diRun);
 856   pLastRun = pNext;
 857   *pbCaretAtEnd = FALSE;
 858   do {
 859     int run_x = pNext->member.run.pt.x;
 860     int width = pNext->member.run.nWidth;
 861     if (x < run_x)
 862     {
 863       if (pOffset) *pOffset = 0;
 864       return pNext;
 865     }
 866     if (x >= run_x && x < run_x+width)
 867     {
 868       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 869       ME_String *s = pNext->member.run.strText;
 870       if (ch < s->nLen) {
 871         if (pOffset)
 872           *pOffset = ch;
 873         return pNext;
 874       }
 875     }
 876     pLastRun = pNext;
 877     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
 878   } while(pNext && pNext->type == diRun);
 879
 880   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
 881   {
 882     pNext = ME_FindItemFwd(pNext, diRun);
 883     if (pbCaretAtEnd) *pbCaretAtEnd = 1;
 884     if (pOffset) *pOffset = 0;
 885     return pNext;
 886   } else {
 887     if (pbCaretAtEnd) *pbCaretAtEnd = 0;
 888     if (pOffset) *pOffset = 0;
 889     return pLastRun;
 890   }
 891 }
 892
 893 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
 894 {
 895   ME_DisplayItem *pRun = pCursor->pRun;
 896   int x;
 897
 898   if (editor->nUDArrowX != -1)
 899     x = editor->nUDArrowX;
 900   else {
 901     if (editor->bCaretAtEnd)
 902     {
 903       pRun = ME_FindItemBack(pRun, diRun);
 904       assert(pRun);
 905       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
 906     }
 907     else {
 908       x = pRun->member.run.pt.x;
 909       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
 910     }
 911     editor->nUDArrowX = x;
 912   }
 913   return x;
 914 }
 915
 916
 917 static void
 918 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 919 {
 920   ME_DisplayItem *pRun = pCursor->pRun;
 921   ME_DisplayItem *pItem;
 922   int x = ME_GetXForArrow(editor, pCursor);
 923
 924   if (editor->bCaretAtEnd && !pCursor->nOffset)
 925     pRun = ME_FindItemBack(pRun, diRun);
 926   if (!pRun)
 927     return;
 928   if (nRelOfs == -1)
 929   {
 930     /* start of this row */
 931     pItem = ME_FindItemBack(pRun, diStartRow);
 932     assert(pItem);
 933     /* start of the previous row */
 934     pItem = ME_FindItemBack(pItem, diStartRow);
 935   }
 936   else
 937   {
 938     /* start of the next row */
 939     pItem = ME_FindItemFwd(pRun, diStartRow);
 940     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
 941     */
 942   }
 943   if (!pItem)
 944   {
 945     /* row not found - ignore */
 946     return;
 947   }
 948   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
 949   assert(pCursor->pRun);
 950   assert(pCursor->pRun->type == diRun);
 951 }
 952
 953
 954 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
 955 {
 956   ME_DisplayItem *pRun = pCursor->pRun;
 957   ME_DisplayItem *pLast, *p;
 958   int x, y, ys, yd, yp, yprev;
 959   ME_Cursor tmp_curs = *pCursor;
 960
 961   x = ME_GetXForArrow(editor, pCursor);
 962   if (!pCursor->nOffset && editor->bCaretAtEnd)
 963     pRun = ME_FindItemBack(pRun, diRun);
 964
 965   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
 966   assert(p->type == diStartRow);
 967   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
 968   yprev = ys = y = yp + p->member.row.nYPos;
 969   yd = y - editor->sizeWindow.cy;
 970   pLast = p;
 971
 972   do {
 973     p = ME_FindItemBack(p, diStartRowOrParagraph);
 974     if (!p)
 975       break;
 976     if (p->type == diParagraph) { /* crossing paragraphs */
 977       if (p->member.para.prev_para == NULL)
 978         break;
 979       yp = p->member.para.prev_para->member.para.nYPos;
 980       continue;
 981     }
 982     y = yp + p->member.row.nYPos;
 983     if (y < yd)
 984       break;
 985     pLast = p;
 986     yprev = y;
 987   } while(1);
 988
 989   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
 990   ME_UpdateSelection(editor, &tmp_curs);
 991   if (yprev < editor->sizeWindow.cy)
 992   {
 993     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
 994     ME_Repaint(editor);
 995   }
 996   else
 997   {
 998     ME_ScrollUp(editor, ys-yprev);
 999   }
1000   assert(pCursor->pRun);
1001   assert(pCursor->pRun->type == diRun);
1002 }
1003
1004 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1005    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1006    In such a situation, clicking the scrollbar restores its position back to the
1007    normal range (ie. sets it to (doclength-screenheight)). */
1008
1009 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1010 {
1011   ME_DisplayItem *pRun = pCursor->pRun;
1012   ME_DisplayItem *pLast, *p;
1013   int x, y, ys, yd, yp, yprev;
1014   ME_Cursor tmp_curs = *pCursor;
1015
1016   x = ME_GetXForArrow(editor, pCursor);
1017   if (!pCursor->nOffset && editor->bCaretAtEnd)
1018     pRun = ME_FindItemBack(pRun, diRun);
1019
1020   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1021   assert(p->type == diStartRow);
1022   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1023   yprev = ys = y = yp + p->member.row.nYPos;
1024   yd = y + editor->sizeWindow.cy;
1025   pLast = p;
1026
1027   do {
1028     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1029     if (!p)
1030       break;
1031     if (p->type == diParagraph) {
1032       yp = p->member.para.nYPos;
1033       continue;
1034     }
1035     y = yp + p->member.row.nYPos;
1036     if (y >= yd)
1037       break;
1038     pLast = p;
1039     yprev = y;
1040   } while(1);
1041
1042   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1043   ME_UpdateSelection(editor, &tmp_curs);
1044   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1045   {
1046     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1047     ME_Repaint(editor);
1048   }
1049   else
1050   {
1051     ME_ScrollUp(editor,ys-yprev);
1052   }
1053   assert(pCursor->pRun);
1054   assert(pCursor->pRun->type == diRun);
1055 }
1056
1057 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1058 {
1059   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1060   /* bCaretAtEnd doesn't make sense if the cursor isn't set at the
1061   first character of the next row */
1062   assert(!editor->bCaretAtEnd || !pCursor->nOffset);
1063   ME_WrapMarkedParagraphs(editor);
1064   if (pRow) {
1065     ME_DisplayItem *pRun;
1066     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1067       pRow = ME_FindItemBack(pRow, diStartRow);
1068       if (!pRow)
1069         return;
1070     }
1071     pRun = ME_FindItemFwd(pRow, diRun);
1072     if (pRun) {
1073       pCursor->pRun = pRun;
1074       pCursor->nOffset = 0;
1075     }
1076   }
1077   editor->bCaretAtEnd = FALSE;
1078 }
1079
1080 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1081 {
1082   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1083   if (pRow) {
1084     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1085     if (pRun) {
1086       pCursor->pRun = pRun;
1087       pCursor->nOffset = 0;
1088     }
1089   }
1090 }
1091
1092 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1093 {
1094   ME_DisplayItem *pRow;
1095
1096   if (editor->bCaretAtEnd && !pCursor->nOffset)
1097     return;
1098
1099   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1100   assert(pRow);
1101   if (pRow->type == diStartRow) {
1102     /* FIXME WTF was I thinking about here ? */
1103     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1104     assert(pRun);
1105     pCursor->pRun = pRun;
1106     pCursor->nOffset = 0;
1107     editor->bCaretAtEnd = 1;
1108     return;
1109   }
1110   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1111   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1112   pCursor->nOffset = 0;
1113   editor->bCaretAtEnd = FALSE;
1114 }
1115
1116 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1117 {
1118   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1119   assert(p);
1120   p = ME_FindItemBack(p, diRun);
1121   assert(p);
1122   assert(p->member.run.nFlags & MERF_ENDPARA);
1123   pCursor->pRun = p;
1124   pCursor->nOffset = 0;
1125   editor->bCaretAtEnd = FALSE;
1126 }
1127
1128 BOOL ME_IsSelection(ME_TextEditor *editor)
1129 {
1130   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1131 }
1132
1133 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1134 {
1135   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1136
1137   if (cdir*dir>0)
1138     return 0;
1139   else
1140     return 1;
1141 }
1142
1143 BOOL ME_UpdateSelection(ME_TextEditor *editor, ME_Cursor *pTempCursor)
1144 {
1145   ME_Cursor old_anchor = editor->pCursors[1];
1146
1147   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1148   {
1149     /* any selection was present ? if so, it's no more, repaint ! */
1150     editor->pCursors[1] = editor->pCursors[0];
1151     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1152       return TRUE;
1153     }
1154     return FALSE;
1155   }
1156   else
1157   {
1158     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1159     {
1160       editor->pCursors[1] = *pTempCursor;
1161       return TRUE;
1162     }
1163   }
1164
1165   ME_Repaint(editor);
1166   return TRUE;
1167 }
1168
1169 void ME_DeleteSelection(ME_TextEditor *editor)
1170 {
1171   int from, to;
1172   ME_GetSelection(editor, &from, &to);
1173   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1174 }
1175
1176 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1177 {
1178   ME_Style *style;
1179   int from, to;
1180   ME_Cursor c;
1181
1182   ME_GetSelection(editor, &from, &to);
1183   ME_CursorFromCharOfs(editor, from, &c);
1184   if (from != to) {
1185     style = c.pRun->member.run.style;
1186     ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
1187   }
1188   else
1189     style = ME_GetInsertStyle(editor, 0);
1190   return style;
1191 }
1192
1193 void ME_SendSelChange(ME_TextEditor *editor)
1194 {
1195   SELCHANGE sc;
1196
1197   ME_ClearTempStyle(editor);
1198
1199   if (!(editor->nEventMask & ENM_SELCHANGE))
1200     return;
1201
1202   sc.nmhdr.hwndFrom = editor->hWnd;
1203   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1204   sc.nmhdr.code = EN_SELCHANGE;
1205   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1206   sc.seltyp = SEL_EMPTY;
1207   if (sc.chrg.cpMin != sc.chrg.cpMax)
1208     sc.seltyp |= SEL_TEXT;
1209   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1210     sc.seltyp |= SEL_MULTICHAR;
1211   SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1212 }
1213
1214
1215 BOOL
1216 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1217 {
1218   int nCursor = 0;
1219   ME_Cursor *p = &editor->pCursors[nCursor];
1220   ME_Cursor tmp_curs = *p;
1221   BOOL success = FALSE;
1222
1223   ME_CheckCharOffsets(editor);
1224   editor->nUDArrowX = -1;
1225   switch(nVKey) {
1226     case VK_LEFT:
1227       editor->bCaretAtEnd = 0;
1228       if (ctrl)
1229         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1230       else
1231         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1232       break;
1233     case VK_RIGHT:
1234       editor->bCaretAtEnd = 0;
1235       if (ctrl)
1236         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1237       else
1238         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1239       break;
1240     case VK_UP:
1241       ME_MoveCursorLines(editor, &tmp_curs, -1);
1242       break;
1243     case VK_DOWN:
1244       ME_MoveCursorLines(editor, &tmp_curs, +1);
1245       break;
1246     case VK_PRIOR:
1247       ME_ArrowPageUp(editor, &tmp_curs);
1248       break;
1249     case VK_NEXT:
1250       ME_ArrowPageDown(editor, &tmp_curs);
1251       break;
1252     case VK_HOME: {
1253       if (ctrl)
1254         ME_ArrowCtrlHome(editor, &tmp_curs);
1255       else
1256         ME_ArrowHome(editor, &tmp_curs);
1257       editor->bCaretAtEnd = 0;
1258       break;
1259     }
1260     case VK_END:
1261       if (ctrl)
1262         ME_ArrowCtrlEnd(editor, &tmp_curs);
1263       else
1264         ME_ArrowEnd(editor, &tmp_curs);
1265       break;
1266   }
1267
1268   if (!extend)
1269     editor->pCursors[1] = tmp_curs;
1270   *p = tmp_curs;
1271
1272   ME_InvalidateSelection(editor);
1273   ME_Repaint(editor);
1274   HideCaret(editor->hWnd);
1275   ME_EnsureVisible(editor, tmp_curs.pRun);
1276   ME_ShowCaret(editor);
1277   ME_SendSelChange(editor);
1278   return success;
1279 }