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 /******************************************************************************
  36  * calc_run_extent
  37  *
  38  * Updates the size of the run (fills width, ascent and descent). The height
  39  * is calculated based on whole row's ascent and descent anyway, so no need
  40  * to use it here.
  41  */
  42 static void calc_run_extent(ME_Context *c, const ME_Paragraph *para, int startx, ME_Run *run)
  43 {
  44     if (run->nFlags & MERF_HIDDEN) run->nWidth = 0;
  45     else
  46     {
  47         SIZE size = ME_GetRunSizeCommon( c, para, run, run->len, startx, &run->nAscent, &run->nDescent );
  48         run->nWidth = size.cx;
  49     }
  50 }
  51
  52 /******************************************************************************
  53  * split_run_extents
  54  *
  55  * Splits a run into two in a given place. It also updates the screen position
  56  * and size (extent) of the newly generated runs.
  57  */
  58 static ME_DisplayItem *split_run_extents(ME_WrapContext *wc, ME_DisplayItem *item, int nVChar)
  59 {
  60   ME_TextEditor *editor = wc->context->editor;
  61   ME_Run *run, *run2;
  62   ME_Paragraph *para = &wc->pPara->member.para;
  63   ME_Cursor cursor = {wc->pPara, item, nVChar};
  64
  65   assert(item->member.run.nCharOfs != -1);
  66   if(TRACE_ON(richedit))
  67   {
  68     TRACE("Before check before split\n");
  69     ME_CheckCharOffsets(editor);
  70     TRACE("After check before split\n");
  71   }
  72
  73   run = &item->member.run;
  74
  75   TRACE("Before split: %s(%d, %d)\n", debugstr_run( run ),
  76         run->pt.x, run->pt.y);
  77
  78   ME_SplitRunSimple(editor, &cursor);
  79
  80   run2 = &cursor.pRun->member.run;
  81
  82   calc_run_extent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
  83
  84   run2->pt.x = run->pt.x+run->nWidth;
  85   run2->pt.y = run->pt.y;
  86
  87   if(TRACE_ON(richedit))
  88   {
  89     TRACE("Before check after split\n");
  90     ME_CheckCharOffsets(editor);
  91     TRACE("After check after split\n");
  92     TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
  93       debugstr_run( run ), run->pt.x, run->pt.y,
  94       debugstr_run( run2 ), run2->pt.x, run2->pt.y);
  95   }
  96
  97   return cursor.pRun;
  98 }
  99
 100 /******************************************************************************
 101  * find_split_point
 102  *
 103  * Returns a character position to split inside the run given a run-relative
 104  * pixel horizontal position. This version rounds left (ie. if the second
 105  * character is at pixel position 8, then for cx=0..7 it returns 0).
 106  */
 107 static int find_split_point( ME_Context *c, int cx, ME_Run *run )
 108 {
 109     if (!run->len || cx <= 0) return 0;
 110     return ME_CharFromPointContext( c, cx, run, FALSE );
 111 }
 112
 113 static ME_DisplayItem *ME_MakeRow(int height, int baseline, int width)
 114 {
 115   ME_DisplayItem *item = ME_MakeDI(diStartRow);
 116
 117   item->member.row.nHeight = height;
 118   item->member.row.nBaseline = baseline;
 119   item->member.row.nWidth = width;
 120   return item;
 121 }
 122
 123 static void ME_BeginRow(ME_WrapContext *wc)
 124 {
 125   PARAFORMAT2 *pFmt;
 126   ME_DisplayItem *para = wc->pPara;
 127
 128   pFmt = para->member.para.pFmt;
 129   wc->pRowStart = NULL;
 130   wc->bOverflown = FALSE;
 131   wc->pLastSplittableRun = NULL;
 132   wc->bWordWrap = wc->context->editor->bWordWrap;
 133   if (para->member.para.nFlags & (MEPF_ROWSTART|MEPF_ROWEND)) {
 134     wc->nAvailWidth = 0;
 135     wc->bWordWrap = FALSE;
 136     if (para->member.para.nFlags & MEPF_ROWEND)
 137     {
 138       ME_Cell *cell = &ME_FindItemBack(para, diCell)->member.cell;
 139       cell->nWidth = 0;
 140     }
 141   } else if (para->member.para.pCell) {
 142     ME_Cell *cell = &para->member.para.pCell->member.cell;
 143     int width;
 144
 145     width = cell->nRightBoundary;
 146     if (cell->prev_cell)
 147       width -= cell->prev_cell->member.cell.nRightBoundary;
 148     if (!cell->prev_cell)
 149     {
 150       int rowIndent = ME_GetTableRowEnd(para)->member.para.pFmt->dxStartIndent;
 151       width -= rowIndent;
 152     }
 153     cell->nWidth = max(ME_twips2pointsX(wc->context, width), 0);
 154
 155     wc->nAvailWidth = cell->nWidth
 156         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
 157     wc->bWordWrap = TRUE;
 158   } else {
 159     wc->nAvailWidth = wc->context->nAvailWidth
 160         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
 161   }
 162   wc->pt.x = wc->context->pt.x;
 163   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 164       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 165     /* Shift the text down because of the border. */
 166     wc->pt.y++;
 167 }
 168
 169 static void ME_InsertRowStart(ME_WrapContext *wc, const ME_DisplayItem *pEnd)
 170 {
 171   ME_DisplayItem *p, *row, *para;
 172   BOOL bSkippingSpaces = TRUE;
 173   int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
 174   PARAFORMAT2 *pFmt;
 175   /* wrap text */
 176   para = wc->pPara;
 177   pFmt = para->member.para.pFmt;
 178
 179   for (p = pEnd->prev; p!=wc->pRowStart->prev; p = p->prev)
 180   {
 181       /* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
 182       if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
 183         if (p->member.run.nAscent>ascent)
 184           ascent = p->member.run.nAscent;
 185         if (p->member.run.nDescent>descent)
 186           descent = p->member.run.nDescent;
 187         if (bSkippingSpaces)
 188         {
 189           /* Exclude space characters from run width.
 190            * Other whitespace or delimiters are not treated this way. */
 191           SIZE sz;
 192           int len = p->member.run.len;
 193           WCHAR *text = get_text( &p->member.run, len - 1 );
 194
 195           assert (len);
 196           if (~p->member.run.nFlags & MERF_GRAPHICS)
 197             while (len && *(text--) == ' ')
 198               len--;
 199           if (len)
 200           {
 201               if (len == p->member.run.len)
 202               {
 203                   width += p->member.run.nWidth;
 204               } else {
 205                   sz = ME_GetRunSize(wc->context, &para->member.para,
 206                                      &p->member.run, len, p->member.run.pt.x);
 207                   width += sz.cx;
 208               }
 209           }
 210           bSkippingSpaces = !len;
 211         } else if (!(p->member.run.nFlags & MERF_ENDPARA))
 212           width += p->member.run.nWidth;
 213       }
 214   }
 215
 216   para->member.para.nWidth = max(para->member.para.nWidth, width);
 217   row = ME_MakeRow(ascent+descent, ascent, width);
 218   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 219       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 220   {
 221     /* The text was shifted down in ME_BeginRow so move the wrap context
 222      * back to where it should be. */
 223     wc->pt.y--;
 224     /* The height of the row is increased by the borders. */
 225     row->member.row.nHeight += 2;
 226   }
 227   row->member.row.pt = wc->pt;
 228   row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
 229   row->member.row.nRMargin = wc->nRightMargin;
 230   assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
 231   align = para->member.para.pFmt->wAlignment;
 232   if (align == PFA_CENTER)
 233     shift = max((wc->nAvailWidth-width)/2, 0);
 234   if (align == PFA_RIGHT)
 235     shift = max(wc->nAvailWidth-width, 0);
 236   for (p = wc->pRowStart; p!=pEnd; p = p->next)
 237   {
 238     if (p->type==diRun) { /* FIXME add more run types */
 239       p->member.run.pt.x += row->member.row.nLMargin+shift;
 240     }
 241   }
 242   ME_InsertBefore(wc->pRowStart, row);
 243   wc->nRow++;
 244   wc->pt.y += row->member.row.nHeight;
 245   ME_BeginRow(wc);
 246 }
 247
 248 static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
 249 {
 250   ME_DisplayItem *para = wc->pPara;
 251   PARAFORMAT2 *pFmt = para->member.para.pFmt;
 252   if (wc->pRowStart)
 253     ME_InsertRowStart(wc, p);
 254   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 255       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 256   {
 257     /* ME_BeginRow was called an extra time for the paragraph, and it shifts the
 258      * text down by one pixel for the border, so fix up the wrap context. */
 259     wc->pt.y--;
 260   }
 261
 262   /*
 263   p = para->next;
 264   while(p) {
 265     if (p->type == diParagraph || p->type == diTextEnd)
 266       return;
 267     if (p->type == diRun)
 268     {
 269       ME_Run *run = &p->member.run;
 270       TRACE("%s - (%d, %d)\n", debugstr_run(run), run->pt.x, run->pt.y);
 271     }
 272     p = p->next;
 273   }
 274   */
 275 }
 276
 277 static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
 278 {
 279   /* FIXME compose style (out of character and paragraph styles) here */
 280
 281   ME_UpdateRunFlags(wc->context->editor, &p->member.run);
 282
 283   calc_run_extent(wc->context, &wc->pPara->member.para,
 284                   wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
 285 }
 286
 287
 288 static int find_non_whitespace(const WCHAR *s, int len, int start)
 289 {
 290   int i;
 291   for (i = start; i < len && ME_IsWSpace( s[i] ); i++)
 292     ;
 293
 294   return i;
 295 }
 296
 297 /* note: these two really return the first matching offset (starting from EOS)+1
 298  * in other words, an offset of the first trailing white/black */
 299
 300 /* note: returns offset of the first trailing whitespace */
 301 static int reverse_find_non_whitespace(const WCHAR *s, int start)
 302 {
 303   int i;
 304   for (i = start; i > 0 && ME_IsWSpace( s[i - 1] ); i--)
 305     ;
 306
 307   return i;
 308 }
 309
 310 /* note: returns offset of the first trailing nonwhitespace */
 311 static int reverse_find_whitespace(const WCHAR *s, int start)
 312 {
 313   int i;
 314   for (i = start; i > 0 && !ME_IsWSpace( s[i - 1] ); i--)
 315     ;
 316
 317   return i;
 318 }
 319
 320 static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
 321 {
 322   ME_DisplayItem *pp, *piter = p;
 323   int j;
 324   if (!i)
 325     return NULL;
 326   j = reverse_find_non_whitespace( get_text( &p->member.run, 0 ), i);
 327   if (j>0) {
 328     pp = split_run_extents(wc, piter, j);
 329     wc->pt.x += piter->member.run.nWidth;
 330     return pp;
 331   }
 332   else
 333   {
 334     pp = piter;
 335     /* omit all spaces before split point */
 336     while(piter != wc->pRowStart)
 337     {
 338       piter = ME_FindItemBack(piter, diRun);
 339       if (piter->member.run.nFlags & MERF_WHITESPACE)
 340       {
 341         pp = piter;
 342         continue;
 343       }
 344       if (piter->member.run.nFlags & MERF_ENDWHITE)
 345       {
 346         i = reverse_find_non_whitespace( get_text( &piter->member.run, 0 ),
 347                                          piter->member.run.len );
 348         pp = split_run_extents(wc, piter, i);
 349         wc->pt = pp->member.run.pt;
 350         return pp;
 351       }
 352       /* this run is the end of spaces, so the run edge is a good point to split */
 353       wc->pt = pp->member.run.pt;
 354       wc->bOverflown = TRUE;
 355       TRACE("Split point is: %s|%s\n", debugstr_run( &piter->member.run ), debugstr_run( &pp->member.run ));
 356       return pp;
 357     }
 358     wc->pt = piter->member.run.pt;
 359     return piter;
 360   }
 361 }
 362
 363 static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
 364 {
 365   ME_DisplayItem *piter = p, *pp;
 366   int i, idesp, len;
 367   ME_Run *run = &p->member.run;
 368
 369   idesp = i = find_split_point( wc->context, loc, run );
 370   len = run->len;
 371   assert(len>0);
 372   assert(i<len);
 373   if (i) {
 374     /* don't split words */
 375     i = reverse_find_whitespace( get_text( run, 0 ), i );
 376     pp = ME_MaximizeSplit(wc, p, i);
 377     if (pp)
 378       return pp;
 379   }
 380   TRACE("Must backtrack to split at: %s\n", debugstr_run( &p->member.run ));
 381   if (wc->pLastSplittableRun)
 382   {
 383     if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
 384     {
 385       wc->pt = wc->pLastSplittableRun->member.run.pt;
 386       return wc->pLastSplittableRun;
 387     }
 388     else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
 389     {
 390       /* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
 391          they serve no other purpose */
 392       ME_UpdateRunFlags(wc->context->editor, run);
 393       assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
 394
 395       piter = wc->pLastSplittableRun;
 396       run = &piter->member.run;
 397       len = run->len;
 398       /* don't split words */
 399       i = reverse_find_whitespace( get_text( run, 0 ), len );
 400       if (i == len)
 401         i = reverse_find_non_whitespace( get_text( run, 0 ), len );
 402       if (i) {
 403         ME_DisplayItem *piter2 = split_run_extents(wc, piter, i);
 404         wc->pt = piter2->member.run.pt;
 405         return piter2;
 406       }
 407       /* splittable = must have whitespaces */
 408       assert(0 == "Splittable, but no whitespaces");
 409     }
 410     else
 411     {
 412       /* restart from the first run beginning with spaces */
 413       wc->pt = wc->pLastSplittableRun->member.run.pt;
 414       return wc->pLastSplittableRun;
 415     }
 416   }
 417   TRACE("Backtracking failed, trying desperate: %s\n", debugstr_run( &p->member.run ));
 418   /* OK, no better idea, so assume we MAY split words if we can split at all*/
 419   if (idesp)
 420     return split_run_extents(wc, piter, idesp);
 421   else
 422   if (wc->pRowStart && piter != wc->pRowStart)
 423   {
 424     /* don't need to break current run, because it's possible to split
 425        before this run */
 426     wc->bOverflown = TRUE;
 427     return piter;
 428   }
 429   else
 430   {
 431     /* split point inside first character - no choice but split after that char */
 432     if (len != 1) {
 433       /* the run is more than 1 char, so we may split */
 434       return split_run_extents(wc, piter, 1);
 435     }
 436     /* the run is one char, can't split it */
 437     return piter;
 438   }
 439 }
 440
 441 static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
 442 {
 443   ME_DisplayItem *pp;
 444   ME_Run *run;
 445   int len;
 446
 447   assert(p->type == diRun);
 448   if (!wc->pRowStart)
 449     wc->pRowStart = p;
 450   run = &p->member.run;
 451   run->pt.x = wc->pt.x;
 452   run->pt.y = wc->pt.y;
 453   ME_WrapSizeRun(wc, p);
 454   len = run->len;
 455
 456   if (wc->bOverflown) /* just skipping final whitespaces */
 457   {
 458     /* End paragraph run can't overflow to the next line by itself. */
 459     if (run->nFlags & MERF_ENDPARA)
 460       return p->next;
 461
 462     if (run->nFlags & MERF_WHITESPACE) {
 463       wc->pt.x += run->nWidth;
 464       /* skip runs consisting of only whitespaces */
 465       return p->next;
 466     }
 467
 468     if (run->nFlags & MERF_STARTWHITE) {
 469       /* try to split the run at the first non-white char */
 470       int black;
 471       black = find_non_whitespace( get_text( run, 0 ), run->len, 0 );
 472       if (black) {
 473         wc->bOverflown = FALSE;
 474         pp = split_run_extents(wc, p, black);
 475         calc_run_extent(wc->context, &wc->pPara->member.para,
 476                         wc->nRow ? wc->nLeftMargin : wc->nFirstMargin,
 477                         &pp->member.run);
 478         ME_InsertRowStart(wc, pp);
 479         return pp;
 480       }
 481     }
 482     /* black run: the row goes from pRowStart to the previous run */
 483     ME_InsertRowStart(wc, p);
 484     return p;
 485   }
 486   /* simply end the current row and move on to next one */
 487   if (run->nFlags & MERF_ENDROW)
 488   {
 489     p = p->next;
 490     ME_InsertRowStart(wc, p);
 491     return p;
 492   }
 493
 494   /* will current run fit? */
 495   if (wc->bWordWrap &&
 496       wc->pt.x + run->nWidth - wc->context->pt.x > wc->nAvailWidth)
 497   {
 498     int loc = wc->context->pt.x + wc->nAvailWidth - wc->pt.x;
 499     /* total white run ? */
 500     if (run->nFlags & MERF_WHITESPACE) {
 501       /* let the overflow logic handle it */
 502       wc->bOverflown = TRUE;
 503       return p;
 504     }
 505     /* TAB: we can split before */
 506     if (run->nFlags & MERF_TAB) {
 507       wc->bOverflown = TRUE;
 508       if (wc->pRowStart == p)
 509         /* Don't split before the start of the run, or we will get an
 510          * endless loop. */
 511         return p->next;
 512       else
 513         return p;
 514     }
 515     /* graphics: we can split before, if run's width is smaller than row's width */
 516     if ((run->nFlags & MERF_GRAPHICS) && run->nWidth <= wc->nAvailWidth) {
 517       wc->bOverflown = TRUE;
 518       return p;
 519     }
 520     /* can we separate out the last spaces ? (to use overflow logic later) */
 521     if (run->nFlags & MERF_ENDWHITE)
 522     {
 523       /* we aren't sure if it's *really* necessary, it's a good start however */
 524       int black = reverse_find_non_whitespace( get_text( run, 0 ), len );
 525       split_run_extents(wc, p, black);
 526       /* handle both parts again */
 527       return p;
 528     }
 529     /* determine the split point by backtracking */
 530     pp = ME_SplitByBacktracking(wc, p, loc);
 531     if (pp == wc->pRowStart)
 532     {
 533       if (run->nFlags & MERF_STARTWHITE)
 534       {
 535           /* We had only spaces so far, so we must be on the first line of the
 536            * paragraph (or the first line after MERF_ENDROW forced the line
 537            * break within the paragraph), since no other lines of the paragraph
 538            * start with spaces. */
 539
 540           /* The lines will only contain spaces, and the rest of the run will
 541            * overflow onto the next line. */
 542           wc->bOverflown = TRUE;
 543           return p;
 544       }
 545       /* Couldn't split the first run, possible because we have a large font
 546        * with a single character that caused an overflow.
 547        */
 548       wc->pt.x += run->nWidth;
 549       return p->next;
 550     }
 551     if (p != pp) /* found a suitable split point */
 552     {
 553       wc->bOverflown = TRUE;
 554       return pp;
 555     }
 556     /* we detected that it's best to split on start of this run */
 557     if (wc->bOverflown)
 558       return pp;
 559     ERR("failure!\n");
 560     /* not found anything - writing over margins is the only option left */
 561   }
 562   if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
 563     || ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
 564   {
 565     wc->pLastSplittableRun = p;
 566   }
 567   wc->pt.x += run->nWidth;
 568   return p->next;
 569 }
 570
 571 static int ME_GetParaLineSpace(ME_Context* c, ME_Paragraph* para)
 572 {
 573   int   sp = 0, ls = 0;
 574   if (!(para->pFmt->dwMask & PFM_LINESPACING)) return 0;
 575
 576   /* FIXME: how to compute simply the line space in ls ??? */
 577   /* FIXME: does line spacing include the line itself ??? */
 578   switch (para->pFmt->bLineSpacingRule)
 579   {
 580   case 0:       sp = ls; break;
 581   case 1:       sp = (3 * ls) / 2; break;
 582   case 2:       sp = 2 * ls; break;
 583   case 3:       sp = ME_twips2pointsY(c, para->pFmt->dyLineSpacing); if (sp < ls) sp = ls; break;
 584   case 4:       sp = ME_twips2pointsY(c, para->pFmt->dyLineSpacing); break;
 585   case 5:       sp = para->pFmt->dyLineSpacing / 20; break;
 586   default: FIXME("Unsupported spacing rule value %d\n", para->pFmt->bLineSpacingRule);
 587   }
 588   if (c->editor->nZoomNumerator == 0)
 589     return sp;
 590   else
 591     return sp * c->editor->nZoomNumerator / c->editor->nZoomDenominator;
 592 }
 593
 594 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
 595   ME_DisplayItem *p;
 596
 597   tp->member.para.nWidth = 0;
 598   /* remove row start items as they will be reinserted by the
 599    * paragraph wrapper anyway */
 600   tp->member.para.nRows = 0;
 601   for (p = tp->next; p != tp->member.para.next_para; p = p->next) {
 602     if (p->type == diStartRow) {
 603       ME_DisplayItem *pRow = p;
 604       p = p->prev;
 605       ME_Remove(pRow);
 606       ME_DestroyDisplayItem(pRow);
 607     }
 608   }
 609   /* join runs that can be joined */
 610   for (p = tp->next; p != tp->member.para.next_para; p = p->next) {
 611     assert(p->type != diStartRow); /* should have been deleted above */
 612     if (p->type == diRun) {
 613       while (p->next->type == diRun && /* FIXME */
 614              ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
 615         ME_JoinRuns(c->editor, p);
 616       }
 617     }
 618   }
 619 }
 620
 621 static void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp) {
 622   ME_DisplayItem *p;
 623   ME_WrapContext wc;
 624   int border = 0;
 625   int linespace = 0;
 626   PARAFORMAT2 *pFmt;
 627
 628   assert(tp->type == diParagraph);
 629   if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
 630     return;
 631   }
 632   ME_PrepareParagraphForWrapping(c, tp);
 633   pFmt = tp->member.para.pFmt;
 634
 635   wc.context = c;
 636   wc.pPara = tp;
 637 /*   wc.para_style = tp->member.para.style; */
 638   wc.style = NULL;
 639   if (tp->member.para.nFlags & MEPF_ROWEND) {
 640     wc.nFirstMargin = wc.nLeftMargin = wc.nRightMargin = 0;
 641   } else {
 642     int dxStartIndent = pFmt->dxStartIndent;
 643     if (tp->member.para.pCell) {
 644       dxStartIndent += ME_GetTableRowEnd(tp)->member.para.pFmt->dxOffset;
 645     }
 646     wc.nFirstMargin = ME_twips2pointsX(c, dxStartIndent);
 647     wc.nLeftMargin = wc.nFirstMargin + ME_twips2pointsX(c, pFmt->dxOffset);
 648     wc.nRightMargin = ME_twips2pointsX(c, pFmt->dxRightIndent);
 649   }
 650   if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 651       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 652   {
 653     wc.nFirstMargin += ME_twips2pointsX(c, pFmt->dxOffset * 2);
 654   }
 655   wc.nRow = 0;
 656   wc.pt.y = 0;
 657   if (pFmt->dwMask & PFM_SPACEBEFORE)
 658     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceBefore);
 659   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 660       pFmt->dwMask & PFM_BORDER)
 661   {
 662     border = ME_GetParaBorderWidth(c, tp->member.para.pFmt->wBorders);
 663     if (pFmt->wBorders & 1) {
 664       wc.nFirstMargin += border;
 665       wc.nLeftMargin += border;
 666     }
 667     if (pFmt->wBorders & 2)
 668       wc.nRightMargin -= border;
 669     if (pFmt->wBorders & 4)
 670       wc.pt.y += border;
 671   }
 672
 673   linespace = ME_GetParaLineSpace(c, &tp->member.para);
 674
 675   ME_BeginRow(&wc);
 676   for (p = tp->next; p!=tp->member.para.next_para; ) {
 677     assert(p->type != diStartRow);
 678     if (p->type == diRun) {
 679       p = ME_WrapHandleRun(&wc, p);
 680     }
 681     else p = p->next;
 682     if (wc.nRow && p == wc.pRowStart)
 683       wc.pt.y += linespace;
 684   }
 685   ME_WrapEndParagraph(&wc, p);
 686   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 687       (pFmt->dwMask & PFM_BORDER) && (pFmt->wBorders & 8))
 688     wc.pt.y += border;
 689   if (tp->member.para.pFmt->dwMask & PFM_SPACEAFTER)
 690     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceAfter);
 691
 692   tp->member.para.nFlags &= ~MEPF_REWRAP;
 693   tp->member.para.nHeight = wc.pt.y;
 694   tp->member.para.nRows = wc.nRow;
 695 }
 696
 697 static void ME_MarkRepaintEnd(ME_DisplayItem *para,
 698                               ME_DisplayItem **repaint_start,
 699                               ME_DisplayItem **repaint_end)
 700 {
 701     if (!*repaint_start)
 702       *repaint_start = para;
 703     *repaint_end = para;
 704 }
 705
 706 BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor)
 707 {
 708   ME_DisplayItem *item;
 709   ME_Context c;
 710   int totalWidth = 0;
 711   ME_DisplayItem *repaint_start = NULL, *repaint_end = NULL;
 712
 713   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 714   c.pt.x = 0;
 715   item = editor->pBuffer->pFirst->next;
 716   while(item != editor->pBuffer->pLast) {
 717     BOOL bRedraw = FALSE;
 718
 719     assert(item->type == diParagraph);
 720     if ((item->member.para.nFlags & MEPF_REWRAP)
 721      || (item->member.para.pt.y != c.pt.y))
 722       bRedraw = TRUE;
 723     item->member.para.pt = c.pt;
 724
 725     ME_WrapTextParagraph(&c, item);
 726
 727     if (bRedraw)
 728       ME_MarkRepaintEnd(item, &repaint_start, &repaint_end);
 729
 730     if (item->member.para.nFlags & MEPF_ROWSTART)
 731     {
 732       ME_DisplayItem *cell = ME_FindItemFwd(item, diCell);
 733       ME_DisplayItem *endRowPara;
 734       int borderWidth = 0;
 735       cell->member.cell.pt = c.pt;
 736       /* Offset the text by the largest top border width. */
 737       while (cell->member.cell.next_cell) {
 738         borderWidth = max(borderWidth, cell->member.cell.border.top.width);
 739         cell = cell->member.cell.next_cell;
 740       }
 741       endRowPara = ME_FindItemFwd(cell, diParagraph);
 742       assert(endRowPara->member.para.nFlags & MEPF_ROWEND);
 743       if (borderWidth > 0)
 744       {
 745         borderWidth = max(ME_twips2pointsY(&c, borderWidth), 1);
 746         while (cell) {
 747           cell->member.cell.yTextOffset = borderWidth;
 748           cell = cell->member.cell.prev_cell;
 749         }
 750         c.pt.y += borderWidth;
 751       }
 752       if (endRowPara->member.para.pFmt->dxStartIndent > 0)
 753       {
 754         int dxStartIndent = endRowPara->member.para.pFmt->dxStartIndent;
 755         cell = ME_FindItemFwd(item, diCell);
 756         cell->member.cell.pt.x += ME_twips2pointsX(&c, dxStartIndent);
 757         c.pt.x = cell->member.cell.pt.x;
 758       }
 759     }
 760     else if (item->member.para.nFlags & MEPF_ROWEND)
 761     {
 762       /* Set all the cells to the height of the largest cell */
 763       ME_DisplayItem *startRowPara;
 764       int prevHeight, nHeight, bottomBorder = 0;
 765       ME_DisplayItem *cell = ME_FindItemBack(item, diCell);
 766       item->member.para.nWidth = cell->member.cell.pt.x + cell->member.cell.nWidth;
 767       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWSTART))
 768       {
 769         /* Last row, the bottom border is added to the height. */
 770         cell = cell->member.cell.prev_cell;
 771         while (cell)
 772         {
 773           bottomBorder = max(bottomBorder, cell->member.cell.border.bottom.width);
 774           cell = cell->member.cell.prev_cell;
 775         }
 776         bottomBorder = ME_twips2pointsY(&c, bottomBorder);
 777         cell = ME_FindItemBack(item, diCell);
 778       }
 779       prevHeight = cell->member.cell.nHeight;
 780       nHeight = cell->member.cell.prev_cell->member.cell.nHeight + bottomBorder;
 781       cell->member.cell.nHeight = nHeight;
 782       item->member.para.nHeight = nHeight;
 783       cell = cell->member.cell.prev_cell;
 784       cell->member.cell.nHeight = nHeight;
 785       while (cell->member.cell.prev_cell)
 786       {
 787         cell = cell->member.cell.prev_cell;
 788         cell->member.cell.nHeight = nHeight;
 789       }
 790       /* Also set the height of the start row paragraph */
 791       startRowPara = ME_FindItemBack(cell, diParagraph);
 792       startRowPara->member.para.nHeight = nHeight;
 793       c.pt.x = startRowPara->member.para.pt.x;
 794       c.pt.y = cell->member.cell.pt.y + nHeight;
 795       if (prevHeight < nHeight)
 796       {
 797         /* The height of the cells has grown, so invalidate the bottom of
 798          * the cells. */
 799         ME_MarkRepaintEnd(item, &repaint_start, &repaint_end);
 800         cell = ME_FindItemBack(item, diCell);
 801         while (cell) {
 802           ME_MarkRepaintEnd(ME_FindItemBack(cell, diParagraph), &repaint_start, &repaint_end);
 803           cell = cell->member.cell.prev_cell;
 804         }
 805       }
 806     }
 807     else if (item->member.para.pCell &&
 808              item->member.para.pCell != item->member.para.next_para->member.para.pCell)
 809     {
 810       /* The next paragraph is in the next cell in the table row. */
 811       ME_Cell *cell = &item->member.para.pCell->member.cell;
 812       cell->nHeight = c.pt.y + item->member.para.nHeight - cell->pt.y;
 813
 814       /* Propagate the largest height to the end so that it can be easily
 815        * sent back to all the cells at the end of the row. */
 816       if (cell->prev_cell)
 817         cell->nHeight = max(cell->nHeight, cell->prev_cell->member.cell.nHeight);
 818
 819       c.pt.x = cell->pt.x + cell->nWidth;
 820       c.pt.y = cell->pt.y;
 821       cell->next_cell->member.cell.pt = c.pt;
 822       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWEND))
 823         c.pt.y += cell->yTextOffset;
 824     }
 825     else
 826     {
 827       if (item->member.para.pCell) {
 828         /* Next paragraph in the same cell. */
 829         c.pt.x = item->member.para.pCell->member.cell.pt.x;
 830       } else {
 831         /* Normal paragraph */
 832         c.pt.x = 0;
 833       }
 834       c.pt.y += item->member.para.nHeight;
 835     }
 836
 837     totalWidth = max(totalWidth, item->member.para.nWidth);
 838     item = item->member.para.next_para;
 839   }
 840   editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
 841   editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
 842
 843   editor->nTotalLength = c.pt.y;
 844   editor->nTotalWidth = totalWidth;
 845   editor->pBuffer->pLast->member.para.pt.x = 0;
 846   editor->pBuffer->pLast->member.para.pt.y = c.pt.y;
 847
 848   ME_DestroyContext(&c);
 849
 850   if (repaint_start || editor->nTotalLength < editor->nLastTotalLength)
 851     ME_InvalidateParagraphRange(editor, repaint_start, repaint_end);
 852   return !!repaint_start;
 853 }
 854
 855 void ME_InvalidateParagraphRange(ME_TextEditor *editor,
 856                                  ME_DisplayItem *start_para,
 857                                  ME_DisplayItem *last_para)
 858 {
 859   ME_Context c;
 860   RECT rc;
 861   int ofs;
 862
 863   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 864   rc = c.rcView;
 865   ofs = editor->vert_si.nPos;
 866
 867   if (start_para) {
 868     start_para = ME_GetOuterParagraph(start_para);
 869     last_para = ME_GetOuterParagraph(last_para);
 870     rc.top = c.rcView.top + start_para->member.para.pt.y - ofs;
 871   } else {
 872     rc.top = c.rcView.top + editor->nTotalLength - ofs;
 873   }
 874   if (editor->nTotalLength < editor->nLastTotalLength)
 875     rc.bottom = c.rcView.top + editor->nLastTotalLength - ofs;
 876   else
 877     rc.bottom = c.rcView.top + last_para->member.para.pt.y + last_para->member.para.nHeight - ofs;
 878   ITextHost_TxInvalidateRect(editor->texthost, &rc, TRUE);
 879
 880   ME_DestroyContext(&c);
 881 }
 882
 883
 884 void
 885 ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
 886 {
 887   if (editor->nEventMask & ENM_REQUESTRESIZE)
 888   {
 889     RECT rc;
 890
 891     ITextHost_TxGetClientRect(editor->texthost, &rc);
 892
 893     if (force || rc.bottom != editor->nTotalLength)
 894     {
 895       REQRESIZE info;
 896
 897       info.nmhdr.hwndFrom = NULL;
 898       info.nmhdr.idFrom = 0;
 899       info.nmhdr.code = EN_REQUESTRESIZE;
 900       info.rc = rc;
 901       info.rc.right = editor->nTotalWidth;
 902       info.rc.bottom = editor->nTotalLength;
 903
 904       editor->nEventMask &= ~ENM_REQUESTRESIZE;
 905       ITextHost_TxNotify(editor->texthost, info.nmhdr.code, &info);
 906       editor->nEventMask |= ENM_REQUESTRESIZE;
 907     }
 908   }
 909 }