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