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