dlls/riched20/wrap.c

   1 /*
   2  * RichEdit - Paragraph wrapping. Don't try to understand it. You've been
   3  * warned !
   4  *
   5  * Copyright 2004 by Krzysztof Foltman
   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 /*
  28  * Unsolved problems:
  29  *
  30  * - center and right align in WordPad omits all spaces at the start, we don't
  31  * - objects/images are not handled yet
  32  * - no tabs
  33  */
  34
  35 static ME_DisplayItem *ME_MakeRow(int height, int baseline, int width)
  36 {
  37   ME_DisplayItem *item = ME_MakeDI(diStartRow);
  38
  39   item->member.row.nHeight = height;
  40   item->member.row.nBaseline = baseline;
  41   item->member.row.nWidth = width;
  42   return item;
  43 }
  44
  45 static void ME_BeginRow(ME_WrapContext *wc)
  46 {
  47   PARAFORMAT2 *pFmt;
  48   ME_DisplayItem *para = wc->pPara;
  49
  50   pFmt = para->member.para.pFmt;
  51   wc->pRowStart = NULL;
  52   wc->bOverflown = FALSE;
  53   wc->pLastSplittableRun = NULL;
  54   wc->bWordWrap = wc->context->editor->bWordWrap;
  55   if (para->member.para.nFlags & (MEPF_ROWSTART|MEPF_ROWEND)) {
  56     wc->nAvailWidth = 0;
  57     wc->bWordWrap = FALSE;
  58     if (para->member.para.nFlags & MEPF_ROWEND)
  59     {
  60       ME_Cell *cell = &ME_FindItemBack(para, diCell)->member.cell;
  61       cell->nWidth = 0;
  62     }
  63   } else if (para->member.para.pCell) {
  64     ME_Cell *cell = &para->member.para.pCell->member.cell;
  65     int width;
  66
  67     width = cell->nRightBoundary;
  68     if (cell->prev_cell)
  69       width -= cell->prev_cell->member.cell.nRightBoundary;
  70     if (!cell->prev_cell)
  71     {
  72       int rowIndent = ME_GetTableRowEnd(para)->member.para.pFmt->dxStartIndent;
  73       width -= rowIndent;
  74     }
  75     cell->nWidth = max(ME_twips2pointsX(wc->context, width), 0);
  76
  77     wc->nAvailWidth = cell->nWidth
  78         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
  79     wc->bWordWrap = TRUE;
  80   } else {
  81     wc->nAvailWidth = wc->context->nAvailWidth
  82         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
  83   }
  84   wc->pt.x = wc->context->pt.x;
  85   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
  86       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
  87     /* Shift the text down because of the border. */
  88     wc->pt.y++;
  89 }
  90
  91 static void ME_InsertRowStart(ME_WrapContext *wc, const ME_DisplayItem *pEnd)
  92 {
  93   ME_DisplayItem *p, *row, *para;
  94   BOOL bSkippingSpaces = TRUE;
  95   int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
  96   PARAFORMAT2 *pFmt;
  97   /* wrap text */
  98   para = wc->pPara;
  99   pFmt = para->member.para.pFmt;
 100
 101   for (p = pEnd->prev; p!=wc->pRowStart->prev; p = p->prev)
 102   {
 103       /* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
 104       if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
 105         if (p->member.run.nAscent>ascent)
 106           ascent = p->member.run.nAscent;
 107         if (p->member.run.nDescent>descent)
 108           descent = p->member.run.nDescent;
 109         if (bSkippingSpaces)
 110         {
 111           /* Exclude space characters from run width.
 112            * Other whitespace or delimiters are not treated this way. */
 113           SIZE sz;
 114           int len = p->member.run.strText->nLen;
 115           WCHAR *text = p->member.run.strText->szData + len - 1;
 116
 117           assert (len);
 118           if (~p->member.run.nFlags & MERF_GRAPHICS)
 119             while (len && *(text--) == ' ')
 120               len--;
 121           if (len)
 122           {
 123               if (len == p->member.run.strText->nLen)
 124               {
 125                   width += p->member.run.nWidth;
 126               } else {
 127                   sz = ME_GetRunSize(wc->context, &para->member.para,
 128                                      &p->member.run, len, p->member.run.pt.x);
 129                   width += sz.cx;
 130               }
 131           }
 132           bSkippingSpaces = !len;
 133         } else if (!(p->member.run.nFlags & MERF_ENDPARA))
 134           width += p->member.run.nWidth;
 135       }
 136   }
 137
 138   para->member.para.nWidth = max(para->member.para.nWidth, width);
 139   row = ME_MakeRow(ascent+descent, ascent, width);
 140   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 141       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 142   {
 143     /* The text was shifted down in ME_BeginRow so move the wrap context
 144      * back to where it should be. */
 145     wc->pt.y--;
 146     /* The height of the row is increased by the borders. */
 147     row->member.row.nHeight += 2;
 148   }
 149   row->member.row.pt = wc->pt;
 150   row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
 151   row->member.row.nRMargin = wc->nRightMargin;
 152   assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
 153   align = para->member.para.pFmt->wAlignment;
 154   if (align == PFA_CENTER)
 155     shift = max((wc->nAvailWidth-width)/2, 0);
 156   if (align == PFA_RIGHT)
 157     shift = max(wc->nAvailWidth-width, 0);
 158   for (p = wc->pRowStart; p!=pEnd; p = p->next)
 159   {
 160     if (p->type==diRun) { /* FIXME add more run types */
 161       p->member.run.pt.x += row->member.row.nLMargin+shift;
 162     }
 163   }
 164   ME_InsertBefore(wc->pRowStart, row);
 165   wc->nRow++;
 166   wc->pt.y += row->member.row.nHeight;
 167   ME_BeginRow(wc);
 168 }
 169
 170 static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
 171 {
 172   ME_DisplayItem *para = wc->pPara;
 173   PARAFORMAT2 *pFmt = para->member.para.pFmt;
 174   if (wc->pRowStart)
 175     ME_InsertRowStart(wc, p);
 176   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 177       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 178   {
 179     /* ME_BeginRow was called an extra time for the paragraph, and it shifts the
 180      * text down by one pixel for the border, so fix up the wrap context. */
 181     wc->pt.y--;
 182   }
 183
 184   /*
 185   p = para->next;
 186   while(p) {
 187     if (p->type == diParagraph || p->type == diTextEnd)
 188       return;
 189     if (p->type == diRun)
 190     {
 191       ME_Run *run = &p->member.run;
 192       TRACE("%s - (%d, %d)\n", debugstr_w(run->strText->szData), run->pt.x, run->pt.y);
 193     }
 194     p = p->next;
 195   }
 196   */
 197 }
 198
 199 static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
 200 {
 201   /* FIXME compose style (out of character and paragraph styles) here */
 202
 203   ME_UpdateRunFlags(wc->context->editor, &p->member.run);
 204
 205   ME_CalcRunExtent(wc->context, &wc->pPara->member.para,
 206                    wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
 207 }
 208
 209 static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
 210 {
 211   ME_DisplayItem *pp, *piter = p;
 212   int j;
 213   if (!i)
 214     return NULL;
 215   j = ME_ReverseFindNonWhitespaceV(p->member.run.strText, i);
 216   if (j>0) {
 217     pp = ME_SplitRun(wc, piter, j);
 218     wc->pt.x += piter->member.run.nWidth;
 219     return pp;
 220   }
 221   else
 222   {
 223     pp = piter;
 224     /* omit all spaces before split point */
 225     while(piter != wc->pRowStart)
 226     {
 227       piter = ME_FindItemBack(piter, diRun);
 228       if (piter->member.run.nFlags & MERF_WHITESPACE)
 229       {
 230         pp = piter;
 231         continue;
 232       }
 233       if (piter->member.run.nFlags & MERF_ENDWHITE)
 234       {
 235         i = ME_ReverseFindNonWhitespaceV(piter->member.run.strText,
 236                                          piter->member.run.strText->nLen);
 237         pp = ME_SplitRun(wc, piter, i);
 238         wc->pt = pp->member.run.pt;
 239         return pp;
 240       }
 241       /* this run is the end of spaces, so the run edge is a good point to split */
 242       wc->pt = pp->member.run.pt;
 243       wc->bOverflown = TRUE;
 244       TRACE("Split point is: %s|%s\n", debugstr_w(piter->member.run.strText->szData), debugstr_w(pp->member.run.strText->szData));
 245       return pp;
 246     }
 247     wc->pt = piter->member.run.pt;
 248     return piter;
 249   }
 250 }
 251
 252 static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
 253 {
 254   ME_DisplayItem *piter = p, *pp;
 255   int i, idesp, len;
 256   ME_Run *run = &p->member.run;
 257
 258   idesp = i = ME_CharFromPoint(wc->context, loc, run);
 259   len = run->strText->nLen;
 260   assert(len>0);
 261   assert(i<len);
 262   if (i) {
 263     /* don't split words */
 264     i = ME_ReverseFindWhitespaceV(run->strText, i);
 265     pp = ME_MaximizeSplit(wc, p, i);
 266     if (pp)
 267       return pp;
 268   }
 269   TRACE("Must backtrack to split at: %s\n", debugstr_w(p->member.run.strText->szData));
 270   if (wc->pLastSplittableRun)
 271   {
 272     if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
 273     {
 274       wc->pt = wc->ptLastSplittableRun;
 275       return wc->pLastSplittableRun;
 276     }
 277     else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
 278     {
 279       /* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
 280          they serve no other purpose */
 281       ME_UpdateRunFlags(wc->context->editor, run);
 282       assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
 283
 284       piter = wc->pLastSplittableRun;
 285       run = &piter->member.run;
 286       len = run->strText->nLen;
 287       /* don't split words */
 288       i = ME_ReverseFindWhitespaceV(run->strText, len);
 289       if (i == len)
 290         i = ME_ReverseFindNonWhitespaceV(run->strText, len);
 291       if (i) {
 292         ME_DisplayItem *piter2 = ME_SplitRun(wc, piter, i);
 293         wc->pt = piter2->member.run.pt;
 294         return piter2;
 295       }
 296       /* splittable = must have whitespaces */
 297       assert(0 == "Splittable, but no whitespaces");
 298     }
 299     else
 300     {
 301       /* restart from the first run beginning with spaces */
 302       wc->pt = wc->ptLastSplittableRun;
 303       return wc->pLastSplittableRun;
 304     }
 305   }
 306   TRACE("Backtracking failed, trying desperate: %s\n", debugstr_w(p->member.run.strText->szData));
 307   /* OK, no better idea, so assume we MAY split words if we can split at all*/
 308   if (idesp)
 309     return ME_SplitRun(wc, piter, idesp);
 310   else
 311   if (wc->pRowStart && piter != wc->pRowStart)
 312   {
 313     /* don't need to break current run, because it's possible to split
 314        before this run */
 315     wc->bOverflown = TRUE;
 316     return piter;
 317   }
 318   else
 319   {
 320     /* split point inside first character - no choice but split after that char */
 321     if (len != 1) {
 322       /* the run is more than 1 char, so we may split */
 323       return ME_SplitRun(wc, piter, 1);
 324     }
 325     /* the run is one char, can't split it */
 326     return piter;
 327   }
 328 }
 329
 330 static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
 331 {
 332   ME_DisplayItem *pp;
 333   ME_Run *run;
 334   int len;
 335
 336   assert(p->type == diRun);
 337   if (!wc->pRowStart)
 338     wc->pRowStart = p;
 339   run = &p->member.run;
 340   run->pt.x = wc->pt.x;
 341   run->pt.y = wc->pt.y;
 342   ME_WrapSizeRun(wc, p);
 343   len = run->strText->nLen;
 344
 345   if (wc->bOverflown) /* just skipping final whitespaces */
 346   {
 347     /* End paragraph run can't overflow to the next line by itself. */
 348     if (run->nFlags & MERF_ENDPARA)
 349       return p->next;
 350
 351     if (run->nFlags & MERF_WHITESPACE) {
 352       p->member.run.nFlags |= MERF_SKIPPED;
 353       wc->pt.x += run->nWidth;
 354       /* skip runs consisting of only whitespaces */
 355       return p->next;
 356     }
 357
 358     if (run->nFlags & MERF_STARTWHITE) {
 359       /* try to split the run at the first non-white char */
 360       int black;
 361       black = ME_FindNonWhitespaceV(run->strText, 0);
 362       if (black) {
 363         wc->bOverflown = FALSE;
 364         pp = ME_SplitRun(wc, p, black);
 365         p->member.run.nFlags |= MERF_SKIPPED;
 366         ME_InsertRowStart(wc, pp);
 367         return pp;
 368       }
 369     }
 370     /* black run: the row goes from pRowStart to the previous run */
 371     ME_InsertRowStart(wc, p);
 372     return p;
 373   }
 374   /* simply end the current row and move on to next one */
 375   if (run->nFlags & MERF_ENDROW)
 376   {
 377     p = p->next;
 378     ME_InsertRowStart(wc, p);
 379     return p;
 380   }
 381
 382   /* will current run fit? */
 383   if (wc->bWordWrap &&
 384       wc->pt.x + run->nWidth - wc->context->pt.x > wc->nAvailWidth)
 385   {
 386     int loc = wc->context->pt.x + wc->nAvailWidth - wc->pt.x;
 387     /* total white run ? */
 388     if (run->nFlags & MERF_WHITESPACE) {
 389       /* let the overflow logic handle it */
 390       wc->bOverflown = TRUE;
 391       return p;
 392     }
 393     /* TAB: we can split before */
 394     if (run->nFlags & MERF_TAB) {
 395       wc->bOverflown = TRUE;
 396       if (wc->pRowStart == p)
 397         /* Don't split before the start of the run, or we will get an
 398          * endless loop. */
 399         return p->next;
 400       else
 401         return p;
 402     }
 403     /* graphics: we can split before, if run's width is smaller than row's width */
 404     if ((run->nFlags & MERF_GRAPHICS) && run->nWidth <= wc->nAvailWidth) {
 405       wc->bOverflown = TRUE;
 406       return p;
 407     }
 408     /* can we separate out the last spaces ? (to use overflow logic later) */
 409     if (run->nFlags & MERF_ENDWHITE)
 410     {
 411       /* we aren't sure if it's *really* necessary, it's a good start however */
 412       int black = ME_ReverseFindNonWhitespaceV(run->strText, len);
 413       ME_SplitRun(wc, p, black);
 414       /* handle both parts again */
 415       return p;
 416     }
 417     /* determine the split point by backtracking */
 418     pp = ME_SplitByBacktracking(wc, p, loc);
 419     if (pp == wc->pRowStart)
 420     {
 421       if (run->nFlags & MERF_STARTWHITE)
 422       {
 423           /* We had only spaces so far, so we must be on the first line of the
 424            * paragraph (or the first line after MERF_ENDROW forced the line
 425            * break within the paragraph), since no other lines of the paragraph
 426            * start with spaces. */
 427
 428           /* The lines will only contain spaces, and the rest of the run will
 429            * overflow onto the next line. */
 430           wc->bOverflown = TRUE;
 431           return p;
 432       }
 433       /* Couldn't split the first run, possible because we have a large font
 434        * with a single character that caused an overflow.
 435        */
 436       wc->pt.x += run->nWidth;
 437       return p->next;
 438     }
 439     if (p != pp) /* found a suitable split point */
 440     {
 441       wc->bOverflown = TRUE;
 442       return pp;
 443     }
 444     /* we detected that it's best to split on start of this run */
 445     if (wc->bOverflown)
 446       return pp;
 447     ERR("failure!\n");
 448     /* not found anything - writing over margins is the only option left */
 449   }
 450   if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
 451     || ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
 452   {
 453     wc->pLastSplittableRun = p;
 454     wc->ptLastSplittableRun = wc->pt;
 455   }
 456   wc->pt.x += run->nWidth;
 457   return p->next;
 458 }
 459
 460 static int ME_GetParaLineSpace(ME_Context* c, ME_Paragraph* para)
 461 {
 462   int   sp = 0, ls = 0;
 463   if (!(para->pFmt->dwMask & PFM_LINESPACING)) return 0;
 464
 465   /* FIXME: how to compute simply the line space in ls ??? */
 466   /* FIXME: does line spacing include the line itself ??? */
 467   switch (para->pFmt->bLineSpacingRule)
 468   {
 469   case 0:       sp = ls; break;
 470   case 1:       sp = (3 * ls) / 2; break;
 471   case 2:       sp = 2 * ls; break;
 472   case 3:       sp = ME_twips2pointsY(c, para->pFmt->dyLineSpacing); if (sp < ls) sp = ls; break;
 473   case 4:       sp = ME_twips2pointsY(c, para->pFmt->dyLineSpacing); break;
 474   case 5:       sp = para->pFmt->dyLineSpacing / 20; break;
 475   default: FIXME("Unsupported spacing rule value %d\n", para->pFmt->bLineSpacingRule);
 476   }
 477   if (c->editor->nZoomNumerator == 0)
 478     return sp;
 479   else
 480     return sp * c->editor->nZoomNumerator / c->editor->nZoomDenominator;
 481 }
 482
 483 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp);
 484
 485 static void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp) {
 486   ME_DisplayItem *p;
 487   ME_WrapContext wc;
 488   int border = 0;
 489   int linespace = 0;
 490   PARAFORMAT2 *pFmt;
 491
 492   assert(tp->type == diParagraph);
 493   if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
 494     return;
 495   }
 496   ME_PrepareParagraphForWrapping(c, tp);
 497   pFmt = tp->member.para.pFmt;
 498
 499   wc.context = c;
 500   wc.pPara = tp;
 501 /*   wc.para_style = tp->member.para.style; */
 502   wc.style = NULL;
 503   if (tp->member.para.nFlags & MEPF_ROWEND) {
 504     wc.nFirstMargin = wc.nLeftMargin = wc.nRightMargin = 0;
 505   } else {
 506     int dxStartIndent = pFmt->dxStartIndent;
 507     if (tp->member.para.pCell) {
 508       dxStartIndent += ME_GetTableRowEnd(tp)->member.para.pFmt->dxOffset;
 509     }
 510     wc.nFirstMargin = ME_twips2pointsX(c, dxStartIndent);
 511     wc.nLeftMargin = wc.nFirstMargin + ME_twips2pointsX(c, pFmt->dxOffset);
 512     wc.nRightMargin = ME_twips2pointsX(c, pFmt->dxRightIndent);
 513   }
 514   if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 515       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 516   {
 517     wc.nFirstMargin += ME_twips2pointsX(c, pFmt->dxOffset * 2);
 518   }
 519   wc.nRow = 0;
 520   wc.pt.y = 0;
 521   if (pFmt->dwMask & PFM_SPACEBEFORE)
 522     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceBefore);
 523   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 524       pFmt->dwMask & PFM_BORDER)
 525   {
 526     border = ME_GetParaBorderWidth(c, tp->member.para.pFmt->wBorders);
 527     if (pFmt->wBorders & 1) {
 528       wc.nFirstMargin += border;
 529       wc.nLeftMargin += border;
 530     }
 531     if (pFmt->wBorders & 2)
 532       wc.nRightMargin -= border;
 533     if (pFmt->wBorders & 4)
 534       wc.pt.y += border;
 535   }
 536
 537   linespace = ME_GetParaLineSpace(c, &tp->member.para);
 538
 539   ME_BeginRow(&wc);
 540   for (p = tp->next; p!=tp->member.para.next_para; ) {
 541     assert(p->type != diStartRow);
 542     if (p->type == diRun) {
 543       p = ME_WrapHandleRun(&wc, p);
 544     }
 545     else p = p->next;
 546     if (wc.nRow && p == wc.pRowStart)
 547       wc.pt.y += linespace;
 548   }
 549   ME_WrapEndParagraph(&wc, p);
 550   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 551       (pFmt->dwMask & PFM_BORDER) && (pFmt->wBorders & 8))
 552     wc.pt.y += border;
 553   if (tp->member.para.pFmt->dwMask & PFM_SPACEAFTER)
 554     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceAfter);
 555
 556   tp->member.para.nFlags &= ~MEPF_REWRAP;
 557   tp->member.para.nHeight = wc.pt.y;
 558   tp->member.para.nRows = wc.nRow;
 559 }
 560
 561
 562 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
 563   ME_DisplayItem *p, *pRow;
 564
 565   tp->member.para.nWidth = 0;
 566   /* remove all items that will be reinserted by paragraph wrapper anyway */
 567   tp->member.para.nRows = 0;
 568   for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
 569     switch(p->type) {
 570       case diStartRow:
 571         pRow = p;
 572         p = p->prev;
 573         ME_Remove(pRow);
 574         ME_DestroyDisplayItem(pRow);
 575         break;
 576       default:
 577         break;
 578     }
 579   }
 580   /* join runs that can be joined, set up flags */
 581   for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
 582     switch(p->type) {
 583       case diStartRow: assert(0); break; /* should have deleted it */
 584       case diRun:
 585         while (p->next->type == diRun) { /* FIXME */
 586           if (ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
 587             ME_JoinRuns(c->editor, p);
 588           }
 589           else
 590             break;
 591         }
 592         p->member.run.nFlags &= ~MERF_CALCBYWRAP;
 593         break;
 594       default:
 595         break;
 596     }
 597   }
 598 }
 599
 600 BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor)
 601 {
 602   ME_DisplayItem *item;
 603   ME_Context c;
 604   BOOL bModified = FALSE;
 605   int totalWidth = 0;
 606
 607   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 608   c.pt.x = 0;
 609   item = editor->pBuffer->pFirst->next;
 610   while(item != editor->pBuffer->pLast) {
 611     BOOL bRedraw = FALSE;
 612
 613     assert(item->type == diParagraph);
 614     if ((item->member.para.nFlags & MEPF_REWRAP)
 615      || (item->member.para.pt.y != c.pt.y))
 616       bRedraw = TRUE;
 617     item->member.para.pt = c.pt;
 618
 619     ME_WrapTextParagraph(&c, item);
 620
 621     if (bRedraw)
 622       item->member.para.nFlags |= MEPF_REPAINT;
 623
 624     bModified = bModified | bRedraw;
 625
 626     if (item->member.para.nFlags & MEPF_ROWSTART)
 627     {
 628       ME_DisplayItem *cell = ME_FindItemFwd(item, diCell);
 629       ME_DisplayItem *endRowPara;
 630       int borderWidth = 0;
 631       cell->member.cell.pt = c.pt;
 632       /* Offset the text by the largest top border width. */
 633       while (cell->member.cell.next_cell) {
 634         borderWidth = max(borderWidth, cell->member.cell.border.top.width);
 635         cell = cell->member.cell.next_cell;
 636       }
 637       endRowPara = ME_FindItemFwd(cell, diParagraph);
 638       assert(endRowPara->member.para.nFlags & MEPF_ROWEND);
 639       if (borderWidth > 0)
 640       {
 641         borderWidth = max(ME_twips2pointsY(&c, borderWidth), 1);
 642         while (cell) {
 643           cell->member.cell.yTextOffset = borderWidth;
 644           cell = cell->member.cell.prev_cell;
 645         }
 646         c.pt.y += borderWidth;
 647       }
 648       if (endRowPara->member.para.pFmt->dxStartIndent > 0)
 649       {
 650         int dxStartIndent = endRowPara->member.para.pFmt->dxStartIndent;
 651         cell = ME_FindItemFwd(item, diCell);
 652         cell->member.cell.pt.x += ME_twips2pointsX(&c, dxStartIndent);
 653         c.pt.x = cell->member.cell.pt.x;
 654       }
 655     }
 656     else if (item->member.para.nFlags & MEPF_ROWEND)
 657     {
 658       /* Set all the cells to the height of the largest cell */
 659       ME_DisplayItem *startRowPara;
 660       int prevHeight, nHeight, bottomBorder = 0;
 661       ME_DisplayItem *cell = ME_FindItemBack(item, diCell);
 662       item->member.para.nWidth = cell->member.cell.pt.x + cell->member.cell.nWidth;
 663       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWSTART))
 664       {
 665         /* Last row, the bottom border is added to the height. */
 666         cell = cell->member.cell.prev_cell;
 667         while (cell)
 668         {
 669           bottomBorder = max(bottomBorder, cell->member.cell.border.bottom.width);
 670           cell = cell->member.cell.prev_cell;
 671         }
 672         bottomBorder = ME_twips2pointsY(&c, bottomBorder);
 673         cell = ME_FindItemBack(item, diCell);
 674       }
 675       prevHeight = cell->member.cell.nHeight;
 676       nHeight = cell->member.cell.prev_cell->member.cell.nHeight + bottomBorder;
 677       cell->member.cell.nHeight = nHeight;
 678       item->member.para.nHeight = nHeight;
 679       cell = cell->member.cell.prev_cell;
 680       cell->member.cell.nHeight = nHeight;
 681       while (cell->member.cell.prev_cell)
 682       {
 683         cell = cell->member.cell.prev_cell;
 684         cell->member.cell.nHeight = nHeight;
 685       }
 686       /* Also set the height of the start row paragraph */
 687       startRowPara = ME_FindItemBack(cell, diParagraph);
 688       startRowPara->member.para.nHeight = nHeight;
 689       c.pt.x = startRowPara->member.para.pt.x;
 690       c.pt.y = cell->member.cell.pt.y + nHeight;
 691       if (prevHeight < nHeight)
 692       {
 693         /* The height of the cells has grown, so invalidate the bottom of
 694          * the cells. */
 695         item->member.para.nFlags |= MEPF_REPAINT;
 696         cell = ME_FindItemBack(item, diCell);
 697         while (cell) {
 698           ME_FindItemBack(cell, diParagraph)->member.para.nFlags |= MEPF_REPAINT;
 699           cell = cell->member.cell.prev_cell;
 700         }
 701       }
 702     }
 703     else if (item->member.para.pCell &&
 704              item->member.para.pCell != item->member.para.next_para->member.para.pCell)
 705     {
 706       /* The next paragraph is in the next cell in the table row. */
 707       ME_Cell *cell = &item->member.para.pCell->member.cell;
 708       cell->nHeight = c.pt.y + item->member.para.nHeight - cell->pt.y;
 709
 710       /* Propagate the largest height to the end so that it can be easily
 711        * sent back to all the cells at the end of the row. */
 712       if (cell->prev_cell)
 713         cell->nHeight = max(cell->nHeight, cell->prev_cell->member.cell.nHeight);
 714
 715       c.pt.x = cell->pt.x + cell->nWidth;
 716       c.pt.y = cell->pt.y;
 717       cell->next_cell->member.cell.pt = c.pt;
 718       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWEND))
 719         c.pt.y += cell->yTextOffset;
 720     }
 721     else
 722     {
 723       if (item->member.para.pCell) {
 724         /* Next paragraph in the same cell. */
 725         c.pt.x = item->member.para.pCell->member.cell.pt.x;
 726       } else {
 727         /* Normal paragraph */
 728         c.pt.x = 0;
 729       }
 730       c.pt.y += item->member.para.nHeight;
 731     }
 732
 733     totalWidth = max(totalWidth, item->member.para.nWidth);
 734     item = item->member.para.next_para;
 735   }
 736   editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
 737   editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
 738
 739   editor->nTotalLength = c.pt.y;
 740   editor->nTotalWidth = totalWidth;
 741   editor->pBuffer->pLast->member.para.pt.x = 0;
 742   editor->pBuffer->pLast->member.para.pt.y = c.pt.y;
 743
 744   ME_DestroyContext(&c);
 745
 746   if (bModified || editor->nTotalLength < editor->nLastTotalLength)
 747     ME_InvalidateMarkedParagraphs(editor);
 748   return bModified;
 749 }
 750
 751 void ME_InvalidateMarkedParagraphs(ME_TextEditor *editor)
 752 {
 753   ME_Context c;
 754   RECT rc;
 755   int ofs;
 756   ME_DisplayItem *item;
 757
 758   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 759   rc = c.rcView;
 760   ofs = editor->vert_si.nPos;
 761
 762   item = editor->pBuffer->pFirst;
 763   while(item != editor->pBuffer->pLast) {
 764     if (item->member.para.nFlags & MEPF_REPAINT) {
 765       rc.top = c.rcView.top + item->member.para.pt.y - ofs;
 766       rc.bottom = max(c.rcView.top + item->member.para.pt.y
 767                       + item->member.para.nHeight - ofs,
 768                       c.rcView.bottom);
 769       ITextHost_TxInvalidateRect(editor->texthost, &rc, TRUE);
 770     }
 771     item = item->member.para.next_para;
 772   }
 773   if (editor->nTotalLength < editor->nLastTotalLength)
 774   {
 775     rc.top = c.rcView.top + editor->nTotalLength - ofs;
 776     rc.bottom = c.rcView.top + editor->nLastTotalLength - ofs;
 777     ITextHost_TxInvalidateRect(editor->texthost, &rc, TRUE);
 778   }
 779   ME_DestroyContext(&c);
 780 }
 781
 782
 783 void
 784 ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
 785 {
 786   if (editor->nEventMask & ENM_REQUESTRESIZE)
 787   {
 788     RECT rc;
 789
 790     ITextHost_TxGetClientRect(editor->texthost, &rc);
 791
 792     if (force || rc.bottom != editor->nTotalLength)
 793     {
 794       REQRESIZE info;
 795
 796       info.nmhdr.hwndFrom = NULL;
 797       info.nmhdr.idFrom = 0;
 798       info.nmhdr.code = EN_REQUESTRESIZE;
 799       info.rc = rc;
 800       info.rc.right = editor->nTotalWidth;
 801       info.rc.bottom = editor->nTotalLength;
 802
 803       editor->nEventMask &= ~ENM_REQUESTRESIZE;
 804       ITextHost_TxNotify(editor->texthost, info.nmhdr.code, &info);
 805       editor->nEventMask |= ENM_REQUESTRESIZE;
 806     }
 807   }
 808 }