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, ME_DisplayItem *para)
  46 {
  47   PARAFORMAT2 *pFmt;
  48   assert(para && para->type == diParagraph);
  49   pFmt = para->member.para.pFmt;
  50   wc->pRowStart = NULL;
  51   wc->bOverflown = FALSE;
  52   wc->pLastSplittableRun = NULL;
  53   wc->bWordWrap = wc->context->editor->bWordWrap;
  54   if (para->member.para.nFlags & (MEPF_ROWSTART|MEPF_ROWEND)) {
  55     wc->nAvailWidth = 0;
  56     wc->bWordWrap = FALSE;
  57     if (para->member.para.nFlags & MEPF_ROWEND)
  58     {
  59       ME_Cell *cell = &ME_FindItemBack(para, diCell)->member.cell;
  60       cell->nWidth = 0;
  61     }
  62   } else if (para->member.para.pCell) {
  63     ME_Cell *cell = &para->member.para.pCell->member.cell;
  64     int width;
  65
  66     width = cell->nRightBoundary;
  67     if (cell->prev_cell)
  68       width -= cell->prev_cell->member.cell.nRightBoundary;
  69     if (!cell->prev_cell)
  70     {
  71       int rowIndent = ME_GetTableRowEnd(para)->member.para.pFmt->dxStartIndent;
  72       width -= rowIndent;
  73     }
  74     cell->nWidth = max(ME_twips2pointsX(wc->context, width), 0);
  75
  76     wc->nAvailWidth = cell->nWidth
  77         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
  78     wc->bWordWrap = TRUE;
  79   } else {
  80     wc->nAvailWidth = wc->context->rcView.right - wc->context->rcView.left
  81         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin
  82         - wc->context->editor->selofs;
  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 = ME_GetParagraph(wc->pRowStart);
  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           while (len && *(text--) == ' ')
 119               len--;
 120           if (len)
 121           {
 122               if (len == p->member.run.strText->nLen)
 123               {
 124                   width += p->member.run.nWidth;
 125               } else {
 126                   sz = ME_GetRunSize(wc->context, &para->member.para,
 127                                      &p->member.run, len, p->member.run.pt.x);
 128                   width += sz.cx;
 129               }
 130           }
 131           bSkippingSpaces = !len;
 132         } else if (!(p->member.run.nFlags & MERF_ENDPARA))
 133           width += p->member.run.nWidth;
 134       }
 135   }
 136
 137   row = ME_MakeRow(ascent+descent, ascent, width);
 138   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 139       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 140   {
 141     /* The text was shifted down in ME_BeginRow so move the wrap context
 142      * back to where it should be. */
 143     wc->pt.y--;
 144     /* The height of the row is increased by the borders. */
 145     row->member.row.nHeight += 2;
 146   }
 147   row->member.row.pt = wc->pt;
 148   row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
 149   row->member.row.nRMargin = wc->nRightMargin;
 150   assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
 151   align = para->member.para.pFmt->wAlignment;
 152   if (align == PFA_CENTER)
 153     shift = max((wc->nAvailWidth-width)/2, 0);
 154   if (align == PFA_RIGHT)
 155     shift = max(wc->nAvailWidth-width, 0);
 156   for (p = wc->pRowStart; p!=pEnd; p = p->next)
 157   {
 158     if (p->type==diRun) { /* FIXME add more run types */
 159       p->member.run.pt.x += row->member.row.nLMargin+shift;
 160     }
 161   }
 162   ME_InsertBefore(wc->pRowStart, row);
 163   wc->nRow++;
 164   wc->pt.y += row->member.row.nHeight;
 165   ME_BeginRow(wc, para);
 166 }
 167
 168 static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
 169 {
 170   ME_DisplayItem *para = p->member.para.prev_para;
 171   PARAFORMAT2 *pFmt = para->member.para.pFmt;
 172   if (wc->pRowStart)
 173     ME_InsertRowStart(wc, p);
 174   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 175       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 176   {
 177     /* ME_BeginRow was called an extra time for the paragraph, and it shifts the
 178      * text down by one pixel for the border, so fix up the wrap context. */
 179     wc->pt.y--;
 180   }
 181
 182   /*
 183   p = p->member.para.prev_para->next;
 184   while(p) {
 185     if (p->type == diParagraph || p->type == diTextEnd)
 186       return;
 187     if (p->type == diRun)
 188     {
 189       ME_Run *run = &p->member.run;
 190       TRACE("%s - (%d, %d)\n", debugstr_w(run->strText->szData), run->pt.x, run->pt.y);
 191     }
 192     p = p->next;
 193   }
 194   */
 195 }
 196
 197 static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
 198 {
 199   /* FIXME compose style (out of character and paragraph styles) here */
 200
 201   ME_UpdateRunFlags(wc->context->editor, &p->member.run);
 202
 203   ME_CalcRunExtent(wc->context, &ME_GetParagraph(p)->member.para,
 204                    wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
 205 }
 206
 207 static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
 208 {
 209   ME_DisplayItem *pp, *piter = p;
 210   int j;
 211   if (!i)
 212     return NULL;
 213   j = ME_ReverseFindNonWhitespaceV(p->member.run.strText, i);
 214   if (j>0) {
 215     pp = ME_SplitRun(wc, piter, j);
 216     wc->pt.x += piter->member.run.nWidth;
 217     return pp;
 218   }
 219   else
 220   {
 221     pp = piter;
 222     /* omit all spaces before split point */
 223     while(piter != wc->pRowStart)
 224     {
 225       piter = ME_FindItemBack(piter, diRun);
 226       if (piter->member.run.nFlags & MERF_WHITESPACE)
 227       {
 228         pp = piter;
 229         continue;
 230       }
 231       if (piter->member.run.nFlags & MERF_ENDWHITE)
 232       {
 233         j = ME_ReverseFindNonWhitespaceV(piter->member.run.strText, i);
 234         pp = ME_SplitRun(wc, piter, i);
 235         wc->pt = pp->member.run.pt;
 236         return pp;
 237       }
 238       /* this run is the end of spaces, so the run edge is a good point to split */
 239       wc->pt = pp->member.run.pt;
 240       wc->bOverflown = TRUE;
 241       TRACE("Split point is: %s|%s\n", debugstr_w(piter->member.run.strText->szData), debugstr_w(pp->member.run.strText->szData));
 242       return pp;
 243     }
 244     wc->pt = piter->member.run.pt;
 245     return piter;
 246   }
 247 }
 248
 249 static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
 250 {
 251   ME_DisplayItem *piter = p, *pp;
 252   int i, idesp, len;
 253   ME_Run *run = &p->member.run;
 254
 255   idesp = i = ME_CharFromPoint(wc->context, loc, run);
 256   len = ME_StrVLen(run->strText);
 257   assert(len>0);
 258   assert(i<len);
 259   if (i) {
 260     /* don't split words */
 261     i = ME_ReverseFindWhitespaceV(run->strText, i);
 262     pp = ME_MaximizeSplit(wc, p, i);
 263     if (pp)
 264       return pp;
 265   }
 266   TRACE("Must backtrack to split at: %s\n", debugstr_w(p->member.run.strText->szData));
 267   if (wc->pLastSplittableRun)
 268   {
 269     if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
 270     {
 271       wc->pt = wc->ptLastSplittableRun;
 272       return wc->pLastSplittableRun;
 273     }
 274     else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
 275     {
 276       /* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
 277          they serve no other purpose */
 278       ME_UpdateRunFlags(wc->context->editor, run);
 279       assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
 280
 281       piter = wc->pLastSplittableRun;
 282       run = &piter->member.run;
 283       len = ME_StrVLen(run->strText);
 284       /* don't split words */
 285       i = ME_ReverseFindWhitespaceV(run->strText, len);
 286       if (i == len)
 287         i = ME_ReverseFindNonWhitespaceV(run->strText, len);
 288       if (i) {
 289         ME_DisplayItem *piter2 = ME_SplitRun(wc, piter, i);
 290         wc->pt = piter2->member.run.pt;
 291         return piter2;
 292       }
 293       /* splittable = must have whitespaces */
 294       assert(0 == "Splittable, but no whitespaces");
 295     }
 296     else
 297     {
 298       /* restart from the first run beginning with spaces */
 299       wc->pt = wc->ptLastSplittableRun;
 300       return wc->pLastSplittableRun;
 301     }
 302   }
 303   TRACE("Backtracking failed, trying desperate: %s\n", debugstr_w(p->member.run.strText->szData));
 304   /* OK, no better idea, so assume we MAY split words if we can split at all*/
 305   if (idesp)
 306     return ME_SplitRun(wc, piter, idesp);
 307   else
 308   if (wc->pRowStart && piter != wc->pRowStart)
 309   {
 310     /* don't need to break current run, because it's possible to split
 311        before this run */
 312     wc->bOverflown = TRUE;
 313     return piter;
 314   }
 315   else
 316   {
 317     /* split point inside first character - no choice but split after that char */
 318     int chars = 1;
 319     int pos2 = ME_StrRelPos(run->strText, 0, &chars);
 320     if (pos2 != len) {
 321       /* the run is more than 1 char, so we may split */
 322       return ME_SplitRun(wc, piter, pos2);
 323     }
 324     /* the run is one char, can't split it */
 325     return piter;
 326   }
 327 }
 328
 329 static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
 330 {
 331   ME_DisplayItem *pp;
 332   ME_Run *run;
 333   int len;
 334
 335   assert(p->type == diRun);
 336   if (!wc->pRowStart)
 337     wc->pRowStart = p;
 338   run = &p->member.run;
 339   run->pt.x = wc->pt.x;
 340   run->pt.y = wc->pt.y;
 341   ME_WrapSizeRun(wc, p);
 342   len = ME_StrVLen(run->strText);
 343
 344   if (wc->bOverflown) /* just skipping final whitespaces */
 345   {
 346     /* End paragraph run can't overflow to the next line by itself. */
 347     if (run->nFlags & MERF_ENDPARA)
 348       return p->next;
 349
 350     if (run->nFlags & MERF_WHITESPACE) {
 351       p->member.run.nFlags |= MERF_SKIPPED;
 352       wc->pt.x += run->nWidth;
 353       /* skip runs consisting of only whitespaces */
 354       return p->next;
 355     }
 356
 357     if (run->nFlags & MERF_STARTWHITE) {
 358       /* try to split the run at the first non-white char */
 359       int black;
 360       black = ME_FindNonWhitespaceV(run->strText, 0);
 361       if (black) {
 362         wc->bOverflown = FALSE;
 363         pp = ME_SplitRun(wc, p, black);
 364         p->member.run.nFlags |= MERF_SKIPPED;
 365         ME_InsertRowStart(wc, pp);
 366         return pp;
 367       }
 368     }
 369     /* black run: the row goes from pRowStart to the previous run */
 370     ME_InsertRowStart(wc, p);
 371     return p;
 372   }
 373   /* simply end the current row and move on to next one */
 374   if (run->nFlags & MERF_ENDROW)
 375   {
 376     p = p->next;
 377     ME_InsertRowStart(wc, p);
 378     return p;
 379   }
 380
 381   /* will current run fit? */
 382   if (wc->bWordWrap &&
 383       wc->pt.x + run->nWidth - wc->context->pt.x > wc->nAvailWidth)
 384   {
 385     int loc = wc->context->pt.x + wc->nAvailWidth - wc->pt.x;
 386     /* total white run ? */
 387     if (run->nFlags & MERF_WHITESPACE) {
 388       /* let the overflow logic handle it */
 389       wc->bOverflown = TRUE;
 390       return p;
 391     }
 392     /* TAB: we can split before */
 393     if (run->nFlags & MERF_TAB) {
 394       wc->bOverflown = TRUE;
 395       if (wc->pRowStart == p)
 396         /* Don't split before the start of the run, or we will get an
 397          * endless loop. */
 398         return p->next;
 399       else
 400         return p;
 401     }
 402     /* graphics: we can split before, if run's width is smaller than row's width */
 403     if ((run->nFlags & MERF_GRAPHICS) && run->nWidth <= wc->nAvailWidth) {
 404       wc->bOverflown = TRUE;
 405       return p;
 406     }
 407     /* can we separate out the last spaces ? (to use overflow logic later) */
 408     if (run->nFlags & MERF_ENDWHITE)
 409     {
 410       /* we aren't sure if it's *really* necessary, it's a good start however */
 411       int black = ME_ReverseFindNonWhitespaceV(run->strText, len);
 412       ME_SplitRun(wc, p, black);
 413       /* handle both parts again */
 414       return p;
 415     }
 416     /* determine the split point by backtracking */
 417     pp = ME_SplitByBacktracking(wc, p, loc);
 418     if (pp == wc->pRowStart)
 419     {
 420       if (run->nFlags & MERF_STARTWHITE)
 421       {
 422           /* We had only spaces so far, so we must be on the first line of the
 423            * paragraph (or the first line after MERF_ENDROW forced the line
 424            * break within the paragraph), since no other lines of the paragraph
 425            * start with spaces. */
 426
 427           /* The lines will only contain spaces, and the rest of the run will
 428            * overflow onto the next line. */
 429           wc->bOverflown = TRUE;
 430           return p;
 431       }
 432       /* Couldn't split the first run, possible because we have a large font
 433        * with a single character that caused an overflow.
 434        */
 435       wc->pt.x += run->nWidth;
 436       return p->next;
 437     }
 438     if (p != pp) /* found a suitable split point */
 439     {
 440       wc->bOverflown = TRUE;
 441       return pp;
 442     }
 443     /* we detected that it's best to split on start of this run */
 444     if (wc->bOverflown)
 445       return pp;
 446     ERR("failure!\n");
 447     /* not found anything - writing over margins is the only option left */
 448   }
 449   if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
 450     || ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
 451   {
 452     wc->pLastSplittableRun = p;
 453     wc->ptLastSplittableRun = wc->pt;
 454   }
 455   wc->pt.x += run->nWidth;
 456   return p->next;
 457 }
 458
 459 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp);
 460
 461 static void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp, DWORD beginofs) {
 462   ME_DisplayItem *p;
 463   ME_WrapContext wc;
 464   int border = 0;
 465   int linespace = 0;
 466   PARAFORMAT2 *pFmt;
 467
 468   assert(tp->type == diParagraph);
 469   if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
 470     return;
 471   }
 472   ME_PrepareParagraphForWrapping(c, tp);
 473   pFmt = tp->member.para.pFmt;
 474
 475   wc.context = c;
 476 /*   wc.para_style = tp->member.para.style; */
 477   wc.style = NULL;
 478   if (tp->member.para.nFlags & MEPF_ROWEND) {
 479     wc.nFirstMargin = wc.nLeftMargin = wc.nRightMargin = 0;
 480   } else {
 481     int dxStartIndent = pFmt->dxStartIndent;
 482     if (tp->member.para.pCell) {
 483       dxStartIndent += ME_GetTableRowEnd(tp)->member.para.pFmt->dxOffset;
 484     }
 485     wc.nFirstMargin = ME_twips2pointsX(c, dxStartIndent);
 486     wc.nLeftMargin = wc.nFirstMargin + ME_twips2pointsX(c, pFmt->dxOffset);
 487     wc.nRightMargin = ME_twips2pointsX(c, pFmt->dxRightIndent);
 488   }
 489   if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 490       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 491   {
 492     wc.nFirstMargin += ME_twips2pointsX(c, pFmt->dxOffset * 2);
 493   }
 494   wc.nRow = 0;
 495   wc.pt.y = 0;
 496   if (pFmt->dwMask & PFM_SPACEBEFORE)
 497     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceBefore);
 498   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 499       pFmt->dwMask & PFM_BORDER)
 500   {
 501     border = ME_GetParaBorderWidth(c->editor, tp->member.para.pFmt->wBorders);
 502     if (pFmt->wBorders & 1) {
 503       wc.nFirstMargin += border;
 504       wc.nLeftMargin += border;
 505     }
 506     if (pFmt->wBorders & 2)
 507       wc.nRightMargin -= border;
 508     if (pFmt->wBorders & 4)
 509       wc.pt.y += border;
 510   }
 511
 512   linespace = ME_GetParaLineSpace(c, &tp->member.para);
 513
 514   ME_BeginRow(&wc, tp);
 515   for (p = tp->next; p!=tp->member.para.next_para; ) {
 516     assert(p->type != diStartRow);
 517     if (p->type == diRun) {
 518       p = ME_WrapHandleRun(&wc, p);
 519     }
 520     else p = p->next;
 521     if (wc.nRow && p == wc.pRowStart)
 522       wc.pt.y += linespace;
 523   }
 524   ME_WrapEndParagraph(&wc, p);
 525   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 526       (pFmt->dwMask & PFM_BORDER) && (pFmt->wBorders & 8))
 527     wc.pt.y += border;
 528   if (tp->member.para.pFmt->dwMask & PFM_SPACEAFTER)
 529     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceAfter);
 530
 531   tp->member.para.nFlags &= ~MEPF_REWRAP;
 532   tp->member.para.nHeight = wc.pt.y;
 533   tp->member.para.nRows = wc.nRow;
 534 }
 535
 536
 537 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
 538   ME_DisplayItem *p, *pRow;
 539
 540   /* remove all items that will be reinserted by paragraph wrapper anyway */
 541   tp->member.para.nRows = 0;
 542   for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
 543     switch(p->type) {
 544       case diStartRow:
 545         pRow = p;
 546         p = p->prev;
 547         ME_Remove(pRow);
 548         ME_DestroyDisplayItem(pRow);
 549         break;
 550       default:
 551         break;
 552     }
 553   }
 554   /* join runs that can be joined, set up flags */
 555   for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
 556     int changed = 0;
 557     switch(p->type) {
 558       case diStartRow: assert(0); break; /* should have deleted it */
 559       case diRun:
 560         while (p->next->type == diRun) { /* FIXME */
 561           if (ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
 562             ME_JoinRuns(c->editor, p);
 563             changed = 1;
 564           }
 565           else
 566             break;
 567         }
 568         p->member.run.nFlags &= ~MERF_CALCBYWRAP;
 569         break;
 570       default:
 571         break;
 572     }
 573   }
 574 }
 575
 576 BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor) {
 577   ME_DisplayItem *item;
 578   ME_Context c;
 579   BOOL bModified = FALSE;
 580   int yStart = -1;
 581   int yLastPos = 0;
 582
 583   ME_InitContext(&c, editor, GetDC(editor->hWnd));
 584   c.pt.x = editor->selofs;
 585   editor->nHeight = 0;
 586   item = editor->pBuffer->pFirst->next;
 587   while(item != editor->pBuffer->pLast) {
 588     BOOL bRedraw = FALSE;
 589
 590     assert(item->type == diParagraph);
 591     editor->nHeight = max(editor->nHeight, item->member.para.pt.y);
 592     if ((item->member.para.nFlags & MEPF_REWRAP)
 593      || (item->member.para.pt.y != c.pt.y))
 594       bRedraw = TRUE;
 595     item->member.para.pt = c.pt;
 596
 597     ME_WrapTextParagraph(&c, item, editor->selofs);
 598
 599     if (bRedraw)
 600     {
 601       item->member.para.nFlags |= MEPF_REPAINT;
 602       if (yStart == -1)
 603         yStart = c.pt.y;
 604     }
 605
 606     bModified = bModified | bRedraw;
 607
 608     yLastPos = max(yLastPos, c.pt.y);
 609
 610     if (item->member.para.nFlags & MEPF_ROWSTART)
 611     {
 612       ME_DisplayItem *cell = ME_FindItemFwd(item, diCell);
 613       ME_DisplayItem *endRowPara;
 614       int borderWidth = 0;
 615       cell->member.cell.pt = c.pt;
 616       /* Offset the text by the largest top border width. */
 617       while (cell->member.cell.next_cell) {
 618         borderWidth = max(borderWidth, cell->member.cell.border.top.width);
 619         cell = cell->member.cell.next_cell;
 620       }
 621       endRowPara = ME_FindItemFwd(cell, diParagraph);
 622       assert(endRowPara->member.para.nFlags & MEPF_ROWEND);
 623       if (borderWidth > 0)
 624       {
 625         borderWidth = max(ME_twips2pointsY(&c, borderWidth), 1);
 626         while (cell) {
 627           cell->member.cell.yTextOffset = borderWidth;
 628           cell = cell->member.cell.prev_cell;
 629         }
 630         c.pt.y += borderWidth;
 631       }
 632       if (endRowPara->member.para.pFmt->dxStartIndent > 0)
 633       {
 634         int dxStartIndent = endRowPara->member.para.pFmt->dxStartIndent;
 635         cell = ME_FindItemFwd(item, diCell);
 636         cell->member.cell.pt.x += ME_twips2pointsX(&c, dxStartIndent);
 637         c.pt.x = cell->member.cell.pt.x;
 638       }
 639     }
 640     else if (item->member.para.nFlags & MEPF_ROWEND)
 641     {
 642       /* Set all the cells to the height of the largest cell */
 643       ME_DisplayItem *startRowPara;
 644       int prevHeight, nHeight, bottomBorder = 0;
 645       ME_DisplayItem *cell = ME_FindItemBack(item, diCell);
 646       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWSTART))
 647       {
 648         /* Last row, the bottom border is added to the height. */
 649         cell = cell->member.cell.prev_cell;
 650         while (cell)
 651         {
 652           bottomBorder = max(bottomBorder, cell->member.cell.border.bottom.width);
 653           cell = cell->member.cell.prev_cell;
 654         }
 655         bottomBorder = ME_twips2pointsY(&c, bottomBorder);
 656         cell = ME_FindItemBack(item, diCell);
 657       }
 658       prevHeight = cell->member.cell.nHeight;
 659       nHeight = cell->member.cell.prev_cell->member.cell.nHeight + bottomBorder;
 660       cell->member.cell.nHeight = nHeight;
 661       item->member.para.nHeight = nHeight;
 662       cell = cell->member.cell.prev_cell;
 663       cell->member.cell.nHeight = nHeight;
 664       while (cell->member.cell.prev_cell)
 665       {
 666         cell = cell->member.cell.prev_cell;
 667         cell->member.cell.nHeight = nHeight;
 668       }
 669       /* Also set the height of the start row paragraph */
 670       startRowPara = ME_FindItemBack(cell, diParagraph);
 671       startRowPara->member.para.nHeight = nHeight;
 672       c.pt.x = startRowPara->member.para.pt.x;
 673       c.pt.y = cell->member.cell.pt.y + nHeight;
 674       if (prevHeight < nHeight)
 675       {
 676         /* The height of the cells has grown, so invalidate the bottom of
 677          * the cells. */
 678         item->member.para.nFlags |= MEPF_REPAINT;
 679         cell = ME_FindItemBack(item, diCell);
 680         while (cell) {
 681           ME_FindItemBack(cell, diParagraph)->member.para.nFlags |= MEPF_REPAINT;
 682           cell = cell->member.cell.prev_cell;
 683         }
 684       }
 685     }
 686     else if (item->member.para.pCell &&
 687              item->member.para.pCell != item->member.para.next_para->member.para.pCell)
 688     {
 689       /* The next paragraph is in the next cell in the table row. */
 690       ME_Cell *cell = &item->member.para.pCell->member.cell;
 691       cell->nHeight = c.pt.y + item->member.para.nHeight - cell->pt.y;
 692
 693       /* Propagate the largest height to the end so that it can be easily
 694        * sent back to all the cells at the end of the row. */
 695       if (cell->prev_cell)
 696         cell->nHeight = max(cell->nHeight, cell->prev_cell->member.cell.nHeight);
 697
 698       c.pt.x = cell->pt.x + cell->nWidth;
 699       c.pt.y = cell->pt.y;
 700       cell->next_cell->member.cell.pt = c.pt;
 701       c.pt.y += cell->yTextOffset;
 702     }
 703     else
 704     {
 705       if (item->member.para.pCell) {
 706         /* Next paragraph in the same cell. */
 707         c.pt.x = item->member.para.pCell->member.cell.pt.x;
 708       } else {
 709         /* Normal paragraph */
 710         c.pt.x = editor->selofs;
 711       }
 712       c.pt.y += item->member.para.nHeight;
 713     }
 714     item = item->member.para.next_para;
 715   }
 716   editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
 717   editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
 718
 719   editor->nTotalLength = c.pt.y;
 720   editor->pBuffer->pLast->member.para.pt.x = 0;
 721   editor->pBuffer->pLast->member.para.pt.y = yLastPos;
 722
 723   ME_DestroyContext(&c, editor->hWnd);
 724
 725   /* Each paragraph may contain multiple rows, which should be scrollable, even
 726      if the containing paragraph has pt.y == 0 */
 727   item = editor->pBuffer->pFirst;
 728   while ((item = ME_FindItemFwd(item, diStartRow)) != NULL) {
 729     assert(item->type == diStartRow);
 730     editor->nHeight = max(editor->nHeight, item->member.row.pt.y);
 731   }
 732
 733   if (bModified || editor->nTotalLength < editor->nLastTotalLength)
 734     ME_InvalidateMarkedParagraphs(editor);
 735   return bModified;
 736 }
 737
 738 void ME_InvalidateMarkedParagraphs(ME_TextEditor *editor) {
 739   ME_Context c;
 740
 741   ME_InitContext(&c, editor, GetDC(editor->hWnd));
 742   if (editor->bRedraw)
 743   {
 744     RECT rc = c.rcView;
 745     int ofs = ME_GetYScrollPos(editor);
 746
 747     ME_DisplayItem *item = editor->pBuffer->pFirst;
 748     while(item != editor->pBuffer->pLast) {
 749       if (item->member.para.nFlags & MEPF_REPAINT) {
 750         rc.top = item->member.para.pt.y - ofs;
 751         rc.bottom = item->member.para.pt.y + item->member.para.nHeight - ofs;
 752         InvalidateRect(editor->hWnd, &rc, TRUE);
 753       }
 754       item = item->member.para.next_para;
 755     }
 756     if (editor->nTotalLength < editor->nLastTotalLength)
 757     {
 758       rc.top = editor->nTotalLength - ofs;
 759       rc.bottom = editor->nLastTotalLength - ofs;
 760       InvalidateRect(editor->hWnd, &rc, TRUE);
 761     }
 762   }
 763   ME_DestroyContext(&c, editor->hWnd);
 764 }
 765
 766
 767 void
 768 ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
 769 {
 770   if (editor->nEventMask & ENM_REQUESTRESIZE)
 771   {
 772     RECT rc;
 773
 774     GetClientRect(editor->hWnd, &rc);
 775
 776     if (force || rc.bottom != editor->nTotalLength)
 777     {
 778       REQRESIZE info;
 779
 780       info.nmhdr.hwndFrom = editor->hWnd;
 781       info.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
 782       info.nmhdr.code = EN_REQUESTRESIZE;
 783       info.rc = rc;
 784       info.rc.bottom = editor->nTotalLength;
 785
 786       editor->nEventMask &= ~ENM_REQUESTRESIZE;
 787       SendMessageW(GetParent(editor->hWnd), WM_NOTIFY,
 788                    info.nmhdr.idFrom, (LPARAM)&info);
 789       editor->nEventMask |= ENM_REQUESTRESIZE;
 790     }
 791   }
 792 }