dll/win32/riched20/table.c

   1 /*
   2  * RichEdit functions dealing with on tables
   3  *
   4  * Copyright 2008 by Dylan Smith
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 /*
  22  * The implementation of tables differs greatly between version 3.0
  23  * (in riched20.dll) and version 4.1 (in msftedit.dll) of richedit controls.
  24  * Currently Wine is not distinguishing between version 3.0 and version 4.1,
  25  * so v4.1 is assumed unless v1.0 is being emulated (i.e. riched32.dll is used).
  26  * If this lack of distinction causes a bug in a Windows application, then Wine
  27  * will need to start making this distinction.
  28  *
  29  * Richedit version 1.0 - 3.0:
  30  *   Tables are implemented in these versions using tabs at the end of cells,
  31  *   and tab stops to position the cells.  The paragraph format flag PFE_TABLE
  32  *   will indicate that the paragraph is a table row.  Note that in this
  33  *   implementation there is one paragraph per table row.
  34  *
  35  * Richedit version 4.1:
  36  *   Tables are implemented such that cells can contain multiple paragraphs,
  37  *   each with it's own paragraph format, and cells may even contain tables
  38  *   nested within the cell.
  39  *
  40  *   There is also a paragraph at the start of each table row that contains
  41  *   the rows paragraph format (e.g. to change the row alignment to row), and a
  42  *   paragraph at the end of the table row with the PFE_TABLEROWDELIMITER flag
  43  *   set. The paragraphs at the start and end of the table row should always be
  44  *   empty, but should have a length of 2.
  45  *
  46  *   Wine implements this using display items (ME_DisplayItem) with a type of
  47  *   diCell.  These cell display items store the cell properties, and are
  48  *   inserted into the editors linked list before each cell, and at the end of
  49  *   the last cell. The cell display item for a cell comes before the paragraphs
  50  *   for the cell, but the last cell display item refers to no cell, so it is
  51  *   just a delimiter.
  52  */
  53
  54 #include "editor.h"
  55 #include "rtf.h"
  56
  57 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  58 WINE_DECLARE_DEBUG_CHANNEL(richedit_lists);
  59
  60 static ME_DisplayItem* ME_InsertEndParaFromCursor(ME_TextEditor *editor,
  61                                                   int nCursor,
  62                                                   int numCR,
  63                                                   int numLF,
  64                                                   int paraFlags)
  65 {
  66   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
  67   ME_DisplayItem *tp;
  68   ME_Cursor* cursor = &editor->pCursors[nCursor];
  69   if (cursor->nOffset) {
  70     ME_SplitRunSimple(editor, cursor->pRun, cursor->nOffset);
  71     cursor = &editor->pCursors[nCursor];
  72   }
  73
  74   tp = ME_SplitParagraph(editor, cursor->pRun, pStyle, numCR, numLF, paraFlags);
  75   cursor->pRun = ME_FindItemFwd(tp, diRun);
  76   return tp;
  77 }
  78
  79 ME_DisplayItem* ME_InsertTableRowStartFromCursor(ME_TextEditor *editor)
  80 {
  81   ME_DisplayItem *para;
  82   para = ME_InsertEndParaFromCursor(editor, 0, 1, 1, MEPF_ROWSTART);
  83   return para->member.para.prev_para;
  84 }
  85
  86 ME_DisplayItem* ME_InsertTableRowStartAtParagraph(ME_TextEditor *editor,
  87                                                   ME_DisplayItem *para)
  88 {
  89   ME_DisplayItem *prev_para, *end_para;
  90   ME_Cursor savedCursor = editor->pCursors[0];
  91   ME_DisplayItem *startRowPara;
  92   editor->pCursors[0].pRun = ME_FindItemFwd(para, diRun);
  93   editor->pCursors[0].nOffset = 0;
  94   editor->pCursors[1] = editor->pCursors[0];
  95   startRowPara = ME_InsertTableRowStartFromCursor(editor);
  96   editor->pCursors[0] = savedCursor;
  97   editor->pCursors[1] = editor->pCursors[0];
  98
  99   end_para = ME_GetParagraph(editor->pCursors[0].pRun)->member.para.next_para;
 100   prev_para = startRowPara->member.para.next_para;
 101   para = prev_para->member.para.next_para;
 102   while (para != end_para)
 103   {
 104     para->member.para.pCell = prev_para->member.para.pCell;
 105     para->member.para.nFlags |= MEPF_CELL;
 106     para->member.para.nFlags &= ~(MEPF_ROWSTART|MEPF_ROWEND);
 107     para->member.para.pFmt->dwMask |= PFM_TABLE|PFM_TABLEROWDELIMITER;
 108     para->member.para.pFmt->wEffects |= PFE_TABLE;
 109     para->member.para.pFmt->wEffects &= ~PFE_TABLEROWDELIMITER;
 110     prev_para = para;
 111     para = para->member.para.next_para;
 112   }
 113   return startRowPara;
 114 }
 115
 116 /* Inserts a diCell and starts a new paragraph for the next cell.
 117  *
 118  * Returns the first paragraph of the new cell. */
 119 ME_DisplayItem* ME_InsertTableCellFromCursor(ME_TextEditor *editor)
 120 {
 121   ME_DisplayItem *para;
 122   para = ME_InsertEndParaFromCursor(editor, 0, 1, 0, MEPF_CELL);
 123   return para;
 124 }
 125
 126 ME_DisplayItem* ME_InsertTableRowEndFromCursor(ME_TextEditor *editor)
 127 {
 128   ME_DisplayItem *para;
 129   para = ME_InsertEndParaFromCursor(editor, 0, 1, 1, MEPF_ROWEND);
 130   return para->member.para.prev_para;
 131 }
 132
 133 ME_DisplayItem* ME_GetTableRowEnd(ME_DisplayItem *para)
 134 {
 135   ME_DisplayItem *cell;
 136   assert(para);
 137   if (para->member.para.nFlags & MEPF_ROWEND)
 138     return para;
 139   if (para->member.para.nFlags & MEPF_ROWSTART)
 140     para = para->member.para.next_para;
 141   cell = para->member.para.pCell;
 142   assert(cell && cell->type == diCell);
 143   while (cell->member.cell.next_cell)
 144     cell = cell->member.cell.next_cell;
 145
 146   para = ME_FindItemFwd(cell, diParagraph);
 147   assert(para && para->member.para.nFlags & MEPF_ROWEND);
 148   return para;
 149 }
 150
 151 ME_DisplayItem* ME_GetTableRowStart(ME_DisplayItem *para)
 152 {
 153   ME_DisplayItem *cell;
 154   assert(para);
 155   if (para->member.para.nFlags & MEPF_ROWSTART)
 156     return para;
 157   if (para->member.para.nFlags & MEPF_ROWEND)
 158     para = para->member.para.prev_para;
 159   cell = para->member.para.pCell;
 160   assert(cell && cell->type == diCell);
 161   while (cell->member.cell.prev_cell)
 162     cell = cell->member.cell.prev_cell;
 163
 164   para = ME_FindItemBack(cell, diParagraph);
 165   assert(para && para->member.para.nFlags & MEPF_ROWSTART);
 166   return para;
 167 }
 168
 169 /* Make a bunch of assertions to make sure tables haven't been corrupted.
 170  *
 171  * These invariants may not hold true in the middle of streaming in rich text
 172  * or during an undo and redo of streaming in rich text. It should be safe to
 173  * call this method after an event is processed.
 174  */
 175 void ME_CheckTablesForCorruption(ME_TextEditor *editor)
 176 {
 177   if(TRACE_ON(richedit_lists))
 178   {
 179     TRACE_(richedit_lists)("---\n");
 180     ME_DumpDocument(editor->pBuffer);
 181   }
 182 #ifndef NDEBUG
 183   {
 184     ME_DisplayItem *p, *pPrev;
 185     pPrev = editor->pBuffer->pFirst;
 186     p = pPrev->next;
 187     if (!editor->bEmulateVersion10) /* v4.1 */
 188     {
 189       while (p->type == diParagraph)
 190       {
 191         assert(p->member.para.pFmt->dwMask & PFM_TABLE);
 192         assert(p->member.para.pFmt->dwMask & PFM_TABLEROWDELIMITER);
 193         if (p->member.para.pCell)
 194         {
 195           assert(p->member.para.nFlags & MEPF_CELL);
 196           assert(p->member.para.pFmt->wEffects & PFE_TABLE);
 197         }
 198         if (p->member.para.pCell != pPrev->member.para.pCell)
 199         {
 200           /* There must be a diCell in between the paragraphs if pCell changes. */
 201           ME_DisplayItem *pCell = ME_FindItemBack(p, diCell);
 202           assert(pCell);
 203           assert(ME_FindItemBack(p, diRun) == ME_FindItemBack(pCell, diRun));
 204         }
 205         if (p->member.para.nFlags & MEPF_ROWEND)
 206         {
 207           /* ROWEND must come after a cell. */
 208           assert(pPrev->member.para.pCell);
 209           assert(p->member.para.pCell
 210                  == pPrev->member.para.pCell->member.cell.parent_cell);
 211           assert(p->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER);
 212         }
 213         else if (p->member.para.pCell)
 214         {
 215           assert(!(p->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER));
 216           assert(pPrev->member.para.pCell ||
 217                  pPrev->member.para.nFlags & MEPF_ROWSTART);
 218           if (pPrev->member.para.pCell &&
 219               !(pPrev->member.para.nFlags & MEPF_ROWSTART))
 220           {
 221             assert(p->member.para.pCell->member.cell.parent_cell
 222                    == pPrev->member.para.pCell->member.cell.parent_cell);
 223             if (pPrev->member.para.pCell != p->member.para.pCell)
 224               assert(pPrev->member.para.pCell
 225                      == p->member.para.pCell->member.cell.prev_cell);
 226           }
 227         }
 228         else if (!(p->member.para.nFlags & MEPF_ROWSTART))
 229         {
 230           assert(!(p->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER));
 231           /* ROWSTART must be followed by a cell. */
 232           assert(!(p->member.para.nFlags & MEPF_CELL));
 233           /* ROWSTART must be followed by a cell. */
 234           assert(!(pPrev->member.para.nFlags & MEPF_ROWSTART));
 235         }
 236         pPrev = p;
 237         p = p->member.para.next_para;
 238       }
 239     } else { /* v1.0 - 3.0 */
 240       while (p->type == diParagraph)
 241       {
 242         assert(!(p->member.para.nFlags & (MEPF_ROWSTART|MEPF_ROWEND|MEPF_CELL)));
 243         assert(p->member.para.pFmt->dwMask & PFM_TABLE);
 244         assert(!(p->member.para.pFmt->wEffects & PFM_TABLEROWDELIMITER));
 245         assert(!p->member.para.pCell);
 246         p = p->member.para.next_para;
 247       }
 248       return;
 249     }
 250     assert(p->type == diTextEnd);
 251     assert(!pPrev->member.para.pCell);
 252   }
 253 #endif
 254 }
 255
 256 BOOL ME_IsInTable(ME_DisplayItem *pItem)
 257 {
 258   PARAFORMAT2 *pFmt;
 259   if (!pItem)
 260     return FALSE;
 261   if (pItem->type == diRun)
 262     pItem = ME_GetParagraph(pItem);
 263   if (pItem->type != diParagraph)
 264     return FALSE;
 265   pFmt = pItem->member.para.pFmt;
 266   return pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE;
 267 }
 268
 269 /* Table rows should either be deleted completely or not at all. */
 270 void ME_ProtectPartialTableDeletion(ME_TextEditor *editor, int nOfs,int *nChars)
 271 {
 272   ME_Cursor c, c2;
 273   ME_DisplayItem *this_para, *end_para;
 274   ME_CursorFromCharOfs(editor, nOfs, &c);
 275   this_para = ME_GetParagraph(c.pRun);
 276   ME_CursorFromCharOfs(editor, nOfs + *nChars, &c2);
 277   end_para = ME_GetParagraph(c2.pRun);
 278   if (c2.pRun->member.run.nFlags & MERF_ENDPARA) {
 279     /* End offset might be in the middle of the end paragraph run.
 280      * If this is the case, then we need to use the next paragraph as the last
 281      * paragraphs.
 282      */
 283     int remaining = nOfs + *nChars - c2.pRun->member.run.nCharOfs
 284                     - end_para->member.para.nCharOfs;
 285     if (remaining)
 286     {
 287       assert(remaining < c2.pRun->member.run.nCR + c2.pRun->member.run.nLF);
 288       end_para = end_para->member.para.next_para;
 289     }
 290   }
 291   if (!editor->bEmulateVersion10) { /* v4.1 */
 292     if (this_para->member.para.pCell != end_para->member.para.pCell ||
 293         ((this_para->member.para.nFlags|end_para->member.para.nFlags)
 294          & (MEPF_ROWSTART|MEPF_ROWEND)))
 295     {
 296       while (this_para != end_para)
 297       {
 298         ME_DisplayItem *next_para = this_para->member.para.next_para;
 299         BOOL bTruancateDeletion = FALSE;
 300         if (this_para->member.para.nFlags & MEPF_ROWSTART) {
 301           /* The following while loop assumes that next_para is MEPF_ROWSTART,
 302            * so moving back one paragraph let's it be processed as the start
 303            * of the row. */
 304           next_para = this_para;
 305           this_para = this_para->member.para.prev_para;
 306         } else if (next_para->member.para.pCell != this_para->member.para.pCell
 307                    || this_para->member.para.nFlags & MEPF_ROWEND)
 308         {
 309           /* Start of the deletion from after the start of the table row. */
 310           bTruancateDeletion = TRUE;
 311         }
 312         while (!bTruancateDeletion &&
 313                next_para->member.para.nFlags & MEPF_ROWSTART)
 314         {
 315           next_para = ME_GetTableRowEnd(next_para)->member.para.next_para;
 316           if (next_para->member.para.nCharOfs > nOfs + *nChars)
 317           {
 318             /* End of deletion is not past the end of the table row. */
 319             next_para = this_para->member.para.next_para;
 320             /* Delete the end paragraph preceding the table row if the
 321              * preceding table row will be empty. */
 322             if (this_para->member.para.nCharOfs >= nOfs)
 323             {
 324               next_para = next_para->member.para.next_para;
 325             }
 326             bTruancateDeletion = TRUE;
 327           } else {
 328             this_para = next_para->member.para.prev_para;
 329           }
 330         }
 331         if (bTruancateDeletion)
 332         {
 333           ME_Run *end_run = &ME_FindItemBack(next_para, diRun)->member.run;
 334           int nCharsNew = (next_para->member.para.nCharOfs - nOfs
 335                            - end_run->nCR - end_run->nLF);
 336           nCharsNew = max(nCharsNew, 0);
 337           assert(nCharsNew <= *nChars);
 338           *nChars = nCharsNew;
 339           break;
 340         }
 341         this_para = next_para;
 342       }
 343     }
 344   } else { /* v1.0 - 3.0 */
 345     ME_DisplayItem *pRun;
 346     int nCharsToBoundary;
 347
 348     if ((this_para->member.para.nCharOfs != nOfs || this_para == end_para) &&
 349         this_para->member.para.pFmt->dwMask & PFM_TABLE &&
 350         this_para->member.para.pFmt->wEffects & PFE_TABLE)
 351     {
 352       pRun = c.pRun;
 353       /* Find the next tab or end paragraph to use as a delete boundary */
 354       while (!(pRun->member.run.nFlags & (MERF_TAB|MERF_ENDPARA)))
 355         pRun = ME_FindItemFwd(pRun, diRun);
 356       nCharsToBoundary = pRun->member.run.nCharOfs
 357                          - c.pRun->member.run.nCharOfs
 358                          - c.nOffset;
 359       *nChars = min(*nChars, nCharsToBoundary);
 360     } else if (end_para->member.para.pFmt->dwMask & PFM_TABLE &&
 361                end_para->member.para.pFmt->wEffects & PFE_TABLE)
 362     {
 363       /* The deletion starts from before the row, so don't join it with
 364        * previous non-empty paragraphs. */
 365       pRun = NULL;
 366       if (nOfs > this_para->member.para.nCharOfs)
 367         pRun = ME_FindItemBack(end_para, diRun);
 368       if (!pRun)
 369         pRun = ME_FindItemFwd(end_para, diRun);
 370       if (pRun)
 371       {
 372         nCharsToBoundary = ME_GetParagraph(pRun)->member.para.nCharOfs
 373                            + pRun->member.run.nCharOfs
 374                            - nOfs;
 375         if (nCharsToBoundary >= 0)
 376           *nChars = min(*nChars, nCharsToBoundary);
 377       }
 378     }
 379     if (*nChars < 0)
 380       nChars = 0;
 381   }
 382 }
 383
 384 ME_DisplayItem* ME_AppendTableRow(ME_TextEditor *editor,
 385                                   ME_DisplayItem *table_row)
 386 {
 387   WCHAR endl = '\r', tab = '\t';
 388   ME_DisplayItem *run;
 389   PARAFORMAT2 *pFmt;
 390   int i;
 391
 392   assert(table_row);
 393   assert(table_row->type == diParagraph);
 394   if (!editor->bEmulateVersion10) { /* v4.1 */
 395     ME_DisplayItem *insertedCell, *para, *cell;
 396     cell = ME_FindItemFwd(ME_GetTableRowStart(table_row), diCell);
 397     run = ME_GetTableRowEnd(table_row)->member.para.next_para;
 398     run = ME_FindItemFwd(run, diRun);
 399     editor->pCursors[0].pRun = run;
 400     editor->pCursors[0].nOffset = 0;
 401     editor->pCursors[1] = editor->pCursors[0];
 402     para = ME_InsertTableRowStartFromCursor(editor);
 403     insertedCell = ME_FindItemFwd(para, diCell);
 404       /* Copy cell properties */
 405     insertedCell->member.cell.nRightBoundary = cell->member.cell.nRightBoundary;
 406     insertedCell->member.cell.border = cell->member.cell.border;
 407     while (cell->member.cell.next_cell) {
 408       cell = cell->member.cell.next_cell;
 409       para = ME_InsertTableCellFromCursor(editor);
 410       insertedCell = ME_FindItemBack(para, diCell);
 411       /* Copy cell properties */
 412       insertedCell->member.cell.nRightBoundary = cell->member.cell.nRightBoundary;
 413       insertedCell->member.cell.border = cell->member.cell.border;
 414     };
 415     ME_InsertTableRowEndFromCursor(editor);
 416     /* return the table row start for the inserted paragraph */
 417     return ME_FindItemFwd(cell, diParagraph)->member.para.next_para;
 418   } else { /* v1.0 - 3.0 */
 419     run = ME_FindItemBack(table_row->member.para.next_para, diRun);
 420     pFmt = table_row->member.para.pFmt;
 421     assert(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE);
 422     editor->pCursors[0].pRun = run;
 423     editor->pCursors[0].nOffset = 0;
 424     editor->pCursors[1] = editor->pCursors[0];
 425     ME_InsertTextFromCursor(editor, 0, &endl, 1, run->member.run.style);
 426     run = editor->pCursors[0].pRun;
 427     for (i = 0; i < pFmt->cTabCount; i++) {
 428       ME_InsertTextFromCursor(editor, 0, &tab, 1, run->member.run.style);
 429     }
 430     return table_row->member.para.next_para;
 431   }
 432 }
 433
 434 /* Selects the next table cell or appends a new table row if at end of table */
 435 static void ME_SelectOrInsertNextCell(ME_TextEditor *editor,
 436                                       ME_DisplayItem *run)
 437 {
 438   ME_DisplayItem *para = ME_GetParagraph(run);
 439   int i;
 440
 441   assert(run && run->type == diRun);
 442   assert(ME_IsInTable(run));
 443   if (!editor->bEmulateVersion10) { /* v4.1 */
 444     ME_DisplayItem *cell;
 445     /* Get the initial cell */
 446     if (para->member.para.nFlags & MEPF_ROWSTART) {
 447       cell = para->member.para.next_para->member.para.pCell;
 448     } else if (para->member.para.nFlags & MEPF_ROWEND) {
 449       cell = para->member.para.prev_para->member.para.pCell;
 450     } else {
 451       cell = para->member.para.pCell;
 452     }
 453     assert(cell);
 454     /* Get the next cell. */
 455     if (cell->member.cell.next_cell &&
 456         cell->member.cell.next_cell->member.cell.next_cell)
 457     {
 458       cell = cell->member.cell.next_cell;
 459     } else {
 460       para = ME_GetTableRowEnd(ME_FindItemFwd(cell, diParagraph));
 461       para = para->member.para.next_para;
 462       assert(para);
 463       if (para->member.para.nFlags & MEPF_ROWSTART) {
 464         cell = para->member.para.next_para->member.para.pCell;
 465       } else {
 466         /* Insert row */
 467         para = para->member.para.prev_para;
 468         para = ME_AppendTableRow(editor, ME_GetTableRowStart(para));
 469         /* Put cursor at the start of the new table row */
 470         para = para->member.para.next_para;
 471         editor->pCursors[0].pRun = ME_FindItemFwd(para, diRun);
 472         editor->pCursors[0].nOffset = 0;
 473         editor->pCursors[1] = editor->pCursors[0];
 474         ME_WrapMarkedParagraphs(editor);
 475         return;
 476       }
 477     }
 478     /* Select cell */
 479     editor->pCursors[1].pRun = ME_FindItemFwd(cell, diRun);
 480     editor->pCursors[1].nOffset = 0;
 481     assert(editor->pCursors[0].pRun);
 482     cell = cell->member.cell.next_cell;
 483     editor->pCursors[0].pRun = ME_FindItemBack(cell, diRun);
 484     editor->pCursors[0].nOffset = 0;
 485     assert(editor->pCursors[1].pRun);
 486   } else { /* v1.0 - 3.0 */
 487     if (run->member.run.nFlags & MERF_ENDPARA &&
 488         ME_IsInTable(ME_FindItemFwd(run, diParagraphOrEnd)))
 489     {
 490       run = ME_FindItemFwd(run, diRun);
 491       assert(run);
 492     }
 493     for (i = 0; i < 2; i++)
 494     {
 495       while (!(run->member.run.nFlags & MERF_TAB))
 496       {
 497         run = ME_FindItemFwd(run, diRunOrParagraphOrEnd);
 498         if (run->type != diRun)
 499         {
 500           para = run;
 501           if (ME_IsInTable(para))
 502           {
 503             run = ME_FindItemFwd(para, diRun);
 504             assert(run);
 505             editor->pCursors[0].pRun = run;
 506             editor->pCursors[0].nOffset = 0;
 507             i = 1;
 508           } else {
 509             /* Insert table row */
 510             para = ME_AppendTableRow(editor, para->member.para.prev_para);
 511             /* Put cursor at the start of the new table row */
 512             editor->pCursors[0].pRun = ME_FindItemFwd(para, diRun);
 513             editor->pCursors[0].nOffset = 0;
 514             editor->pCursors[1] = editor->pCursors[0];
 515             ME_WrapMarkedParagraphs(editor);
 516             return;
 517           }
 518         }
 519       }
 520       if (i == 0)
 521         run = ME_FindItemFwd(run, diRun);
 522       editor->pCursors[i].pRun = run;
 523       editor->pCursors[i].nOffset = 0;
 524     }
 525   }
 526 }
 527
 528
 529 void ME_TabPressedInTable(ME_TextEditor *editor, BOOL bSelectedRow)
 530 {
 531   /* FIXME: Shift tab should move to the previous cell. */
 532   ME_Cursor fromCursor, toCursor;
 533   ME_InvalidateSelection(editor);
 534   {
 535     int from, to;
 536     from = ME_GetCursorOfs(editor, 0);
 537     to = ME_GetCursorOfs(editor, 1);
 538     if (from <= to)
 539     {
 540       fromCursor = editor->pCursors[0];
 541       toCursor = editor->pCursors[1];
 542     } else {
 543       fromCursor = editor->pCursors[1];
 544       toCursor = editor->pCursors[0];
 545     }
 546   }
 547   if (!editor->bEmulateVersion10) /* v4.1 */
 548   {
 549     if (!ME_IsInTable(toCursor.pRun))
 550     {
 551       editor->pCursors[0] = toCursor;
 552       editor->pCursors[1] = toCursor;
 553     } else {
 554       ME_SelectOrInsertNextCell(editor, toCursor.pRun);
 555     }
 556   } else { /* v1.0 - 3.0 */
 557     if (!ME_IsInTable(fromCursor.pRun)) {
 558       editor->pCursors[0] = fromCursor;
 559       editor->pCursors[1] = fromCursor;
 560       /* FIXME: For some reason the caret is shown at the start of the
 561        *        previous paragraph in v1.0 to v3.0, and bCaretAtEnd only works
 562        *        within the paragraph for wrapped lines. */
 563       if (ME_FindItemBack(fromCursor.pRun, diRun))
 564         editor->bCaretAtEnd = TRUE;
 565     } else if ((bSelectedRow || !ME_IsInTable(toCursor.pRun))) {
 566       ME_SelectOrInsertNextCell(editor, fromCursor.pRun);
 567     } else {
 568       if (ME_IsSelection(editor) && !toCursor.nOffset)
 569       {
 570         ME_DisplayItem *run;
 571         run = ME_FindItemBack(toCursor.pRun, diRunOrParagraphOrEnd);
 572         if (run->type == diRun && run->member.run.nFlags & MERF_TAB)
 573           ME_SelectOrInsertNextCell(editor, run);
 574         else
 575           ME_SelectOrInsertNextCell(editor, toCursor.pRun);
 576       } else {
 577         ME_SelectOrInsertNextCell(editor, toCursor.pRun);
 578       }
 579     }
 580   }
 581   ME_InvalidateSelection(editor);
 582   ME_Repaint(editor);
 583   HideCaret(editor->hWnd);
 584   ME_ShowCaret(editor);
 585   ME_SendSelChange(editor);
 586 }
 587
 588 /* Make sure the cursor is not in the hidden table row start paragraph
 589  * without a selection. */
 590 void ME_MoveCursorFromTableRowStartParagraph(ME_TextEditor *editor)
 591 {
 592   ME_DisplayItem *para = ME_GetParagraph(editor->pCursors[0].pRun);
 593   if (para == ME_GetParagraph(editor->pCursors[1].pRun) &&
 594       para->member.para.nFlags & MEPF_ROWSTART) {
 595     /* The cursors should not be at the hidden start row paragraph without
 596      * a selection, so the cursor is moved into the first cell. */
 597     para = para->member.para.next_para;
 598     editor->pCursors[0].pRun = ME_FindItemFwd(para, diRun);
 599     editor->pCursors[0].nOffset = 0;
 600     editor->pCursors[1] = editor->pCursors[0];
 601   }
 602 }
 603
 604 struct RTFTable *ME_MakeTableDef(ME_TextEditor *editor)
 605 {
 606   RTFTable *tableDef = ALLOC_OBJ(RTFTable);
 607   ZeroMemory(tableDef, sizeof(RTFTable));
 608   if (!editor->bEmulateVersion10) /* v4.1 */
 609     tableDef->gapH = 10;
 610   return tableDef;
 611 }
 612
 613 void ME_InitTableDef(ME_TextEditor *editor, struct RTFTable *tableDef)
 614 {
 615   ZeroMemory(tableDef->cells, sizeof(tableDef->cells));
 616   ZeroMemory(tableDef->border, sizeof(tableDef->border));
 617   tableDef->numCellsDefined = 0;
 618   tableDef->leftEdge = 0;
 619   if (!editor->bEmulateVersion10) /* v4.1 */
 620     tableDef->gapH = 10;
 621   else /* v1.0 - 3.0 */
 622     tableDef->gapH = 0;
 623 }