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 WINE_DECLARE_DEBUG_CHANNEL(richedit_check);
  27
  28 /*
  29  * Unsolved problems:
  30  *
  31  * - center and right align in WordPad omits all spaces at the start, we don't
  32  * - objects/images are not handled yet
  33  * - no tabs
  34  */
  35
  36 typedef struct tagME_WrapContext
  37 {
  38   ME_Style *style;
  39   ME_Context *context;
  40   int nLeftMargin, nRightMargin;
  41   int nFirstMargin;   /* Offset to first line's text, always to the text itself even if a para number is present */
  42   int nParaNumOffset; /* Offset to the para number */
  43   int nAvailWidth;    /* Width avail for text to wrap into.  Does not include any para number text */
  44   int nRow;
  45   POINT pt;
  46   BOOL bOverflown, bWordWrap;
  47   ME_DisplayItem *pPara;
  48   ME_DisplayItem *pRowStart;
  49
  50   ME_DisplayItem *pLastSplittableRun;
  51 } ME_WrapContext;
  52
  53 static BOOL get_run_glyph_buffers( ME_Run *run )
  54 {
  55     heap_free( run->glyphs );
  56     run->glyphs = heap_alloc( run->max_glyphs * (sizeof(WORD) + sizeof(SCRIPT_VISATTR) + sizeof(int) + sizeof(GOFFSET)) );
  57     if (!run->glyphs) return FALSE;
  58
  59     run->vis_attrs = (SCRIPT_VISATTR*)((char*)run->glyphs + run->max_glyphs * sizeof(WORD));
  60     run->advances = (int*)((char*)run->glyphs + run->max_glyphs * (sizeof(WORD) + sizeof(SCRIPT_VISATTR)));
  61     run->offsets = (GOFFSET*)((char*)run->glyphs + run->max_glyphs * (sizeof(WORD) + sizeof(SCRIPT_VISATTR) + sizeof(int)));
  62
  63     return TRUE;
  64 }
  65
  66 static HRESULT shape_run( ME_Context *c, ME_Run *run )
  67 {
  68     HRESULT hr;
  69     HFONT old_font;
  70     int i;
  71
  72     if (!run->glyphs)
  73     {
  74         run->max_glyphs = 1.5 * run->len + 16; /* This is suggested in the uniscribe documentation */
  75         run->max_glyphs = (run->max_glyphs + 7) & ~7; /* Keep alignment simple */
  76         get_run_glyph_buffers( run );
  77     }
  78
  79     if (run->max_clusters < run->len)
  80     {
  81         heap_free( run->clusters );
  82         run->max_clusters = run->len * 2;
  83         run->clusters = heap_alloc( run->max_clusters * sizeof(WORD) );
  84     }
  85
  86     old_font = ME_SelectStyleFont( c, run->style );
  87     while (1)
  88     {
  89         hr = ScriptShape( c->hDC, &run->style->script_cache, get_text( run, 0 ), run->len, run->max_glyphs,
  90                           &run->script_analysis, run->glyphs, run->clusters, run->vis_attrs, &run->num_glyphs );
  91         if (hr != E_OUTOFMEMORY) break;
  92         if (run->max_glyphs > 10 * run->len) break; /* something has clearly gone wrong */
  93         run->max_glyphs *= 2;
  94         get_run_glyph_buffers( run );
  95     }
  96
  97     if (SUCCEEDED(hr))
  98         hr = ScriptPlace( c->hDC, &run->style->script_cache, run->glyphs, run->num_glyphs, run->vis_attrs,
  99                           &run->script_analysis, run->advances, run->offsets, NULL );
 100
 101     if (SUCCEEDED(hr))
 102     {
 103         for (i = 0, run->nWidth = 0; i < run->num_glyphs; i++)
 104             run->nWidth += run->advances[i];
 105     }
 106
 107     ME_UnselectStyleFont( c, run->style, old_font );
 108
 109     return hr;
 110 }
 111
 112 /******************************************************************************
 113  * calc_run_extent
 114  *
 115  * Updates the size of the run (fills width, ascent and descent). The height
 116  * is calculated based on whole row's ascent and descent anyway, so no need
 117  * to use it here.
 118  */
 119 static void calc_run_extent(ME_Context *c, const ME_Paragraph *para, int startx, ME_Run *run)
 120 {
 121     if (run->nFlags & MERF_HIDDEN) run->nWidth = 0;
 122     else
 123     {
 124         SIZE size = ME_GetRunSizeCommon( c, para, run, run->len, startx, &run->nAscent, &run->nDescent );
 125         run->nWidth = size.cx;
 126     }
 127 }
 128
 129 /******************************************************************************
 130  * split_run_extents
 131  *
 132  * Splits a run into two in a given place. It also updates the screen position
 133  * and size (extent) of the newly generated runs.
 134  */
 135 static ME_DisplayItem *split_run_extents(ME_WrapContext *wc, ME_DisplayItem *item, int nVChar)
 136 {
 137   ME_TextEditor *editor = wc->context->editor;
 138   ME_Run *run, *run2;
 139   ME_Paragraph *para = &wc->pPara->member.para;
 140   ME_Cursor cursor = {wc->pPara, item, nVChar};
 141
 142   assert(item->member.run.nCharOfs != -1);
 143   if(TRACE_ON(richedit_check))
 144     ME_CheckCharOffsets(editor);
 145
 146   run = &item->member.run;
 147
 148   TRACE("Before split: %s(%d, %d)\n", debugstr_run( run ),
 149         run->pt.x, run->pt.y);
 150
 151   ME_SplitRunSimple(editor, &cursor);
 152
 153   run2 = &cursor.pRun->member.run;
 154   run2->script_analysis = run->script_analysis;
 155
 156   shape_run( wc->context, run );
 157   shape_run( wc->context, run2 );
 158   calc_run_extent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
 159
 160   run2->pt.x = run->pt.x+run->nWidth;
 161   run2->pt.y = run->pt.y;
 162
 163   if(TRACE_ON(richedit_check))
 164     ME_CheckCharOffsets(editor);
 165
 166   TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
 167         debugstr_run( run ), run->pt.x, run->pt.y,
 168         debugstr_run( run2 ), run2->pt.x, run2->pt.y);
 169
 170   return cursor.pRun;
 171 }
 172
 173 /******************************************************************************
 174  * find_split_point
 175  *
 176  * Returns a character position to split inside the run given a run-relative
 177  * pixel horizontal position. This version rounds left (ie. if the second
 178  * character is at pixel position 8, then for cx=0..7 it returns 0).
 179  */
 180 static int find_split_point( ME_Context *c, int cx, ME_Run *run )
 181 {
 182     if (!run->len || cx <= 0) return 0;
 183     return ME_CharFromPointContext( c, cx, run, FALSE, FALSE );
 184 }
 185
 186 static ME_DisplayItem *ME_MakeRow(int height, int baseline, int width)
 187 {
 188   ME_DisplayItem *item = ME_MakeDI(diStartRow);
 189
 190   item->member.row.nHeight = height;
 191   item->member.row.nBaseline = baseline;
 192   item->member.row.nWidth = width;
 193   return item;
 194 }
 195
 196 static void ME_BeginRow(ME_WrapContext *wc)
 197 {
 198   PARAFORMAT2 *pFmt;
 199   ME_DisplayItem *para = wc->pPara;
 200
 201   pFmt = &para->member.para.fmt;
 202   wc->pRowStart = NULL;
 203   wc->bOverflown = FALSE;
 204   wc->pLastSplittableRun = NULL;
 205   wc->bWordWrap = wc->context->editor->bWordWrap;
 206   if (para->member.para.nFlags & (MEPF_ROWSTART|MEPF_ROWEND)) {
 207     wc->nAvailWidth = 0;
 208     wc->bWordWrap = FALSE;
 209     if (para->member.para.nFlags & MEPF_ROWEND)
 210     {
 211       ME_Cell *cell = &ME_FindItemBack(para, diCell)->member.cell;
 212       cell->nWidth = 0;
 213     }
 214   } else if (para->member.para.pCell) {
 215     ME_Cell *cell = &para->member.para.pCell->member.cell;
 216     int width;
 217
 218     width = cell->nRightBoundary;
 219     if (cell->prev_cell)
 220       width -= cell->prev_cell->member.cell.nRightBoundary;
 221     if (!cell->prev_cell)
 222     {
 223       int rowIndent = ME_GetTableRowEnd(para)->member.para.fmt.dxStartIndent;
 224       width -= rowIndent;
 225     }
 226     cell->nWidth = max(ME_twips2pointsX(wc->context, width), 0);
 227
 228     wc->nAvailWidth = cell->nWidth
 229         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
 230     wc->bWordWrap = TRUE;
 231   } else {
 232     wc->nAvailWidth = wc->context->nAvailWidth
 233         - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
 234   }
 235   wc->pt.x = wc->context->pt.x;
 236   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 237       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 238     /* Shift the text down because of the border. */
 239     wc->pt.y++;
 240 }
 241
 242 static void layout_row( ME_DisplayItem *start, const ME_DisplayItem *end )
 243 {
 244     ME_DisplayItem *p;
 245     int i, num_runs = 0;
 246     int buf[16 * 5]; /* 5 arrays - 4 of int & 1 of BYTE, alloc space for 5 of ints */
 247     int *vis_to_log = buf, *log_to_vis, *widths, *pos;
 248     BYTE *levels;
 249     BOOL found_black = FALSE;
 250
 251     for (p = end->prev; p != start->prev; p = p->prev)
 252     {
 253         if (p->type == diRun)
 254         {
 255             if (!found_black) found_black = !(p->member.run.nFlags & (MERF_WHITESPACE | MERF_ENDPARA));
 256             if (found_black) num_runs++;
 257         }
 258     }
 259
 260     TRACE("%d runs\n", num_runs);
 261     if (!num_runs) return;
 262
 263     if (num_runs > sizeof(buf) / (sizeof(buf[0]) * 5))
 264         vis_to_log = heap_alloc( num_runs * sizeof(int) * 5 );
 265
 266     log_to_vis = vis_to_log + num_runs;
 267     widths = vis_to_log + 2 * num_runs;
 268     pos = vis_to_log + 3 * num_runs;
 269     levels = (BYTE*)(vis_to_log + 4 * num_runs);
 270
 271     for (i = 0, p = start; i < num_runs; p = p->next)
 272     {
 273         if (p->type == diRun)
 274         {
 275             levels[i] = p->member.run.script_analysis.s.uBidiLevel;
 276             widths[i] = p->member.run.nWidth;
 277             TRACE( "%d: level %d width %d\n", i, levels[i], widths[i] );
 278             i++;
 279         }
 280     }
 281
 282     ScriptLayout( num_runs, levels, vis_to_log, log_to_vis );
 283
 284     pos[0] = start->member.run.para->pt.x;
 285     for (i = 1; i < num_runs; i++)
 286         pos[i] = pos[i - 1] + widths[ vis_to_log[ i - 1 ] ];
 287
 288     for (i = 0, p = start; i < num_runs; p = p->next)
 289     {
 290         if (p->type == diRun)
 291         {
 292             p->member.run.pt.x = pos[ log_to_vis[ i ] ];
 293             TRACE( "%d: x = %d\n", i, p->member.run.pt.x );
 294             i++;
 295         }
 296     }
 297
 298     if (vis_to_log != buf) heap_free( vis_to_log );
 299 }
 300
 301 static void ME_InsertRowStart(ME_WrapContext *wc, const ME_DisplayItem *pEnd)
 302 {
 303   ME_DisplayItem *p, *row;
 304   ME_Paragraph *para = &wc->pPara->member.para;
 305   BOOL bSkippingSpaces = TRUE;
 306   int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
 307
 308   /* Include height of para numbering label */
 309   if (wc->nRow == 0 && para->fmt.wNumbering)
 310   {
 311       ascent = para->para_num.style->tm.tmAscent;
 312       descent = para->para_num.style->tm.tmDescent;
 313   }
 314
 315   for (p = pEnd->prev; p!=wc->pRowStart->prev; p = p->prev)
 316   {
 317       /* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
 318       if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
 319         if (p->member.run.nAscent>ascent)
 320           ascent = p->member.run.nAscent;
 321         if (p->member.run.nDescent>descent)
 322           descent = p->member.run.nDescent;
 323         if (bSkippingSpaces)
 324         {
 325           /* Exclude space characters from run width.
 326            * Other whitespace or delimiters are not treated this way. */
 327           int len = p->member.run.len;
 328           WCHAR *text = get_text( &p->member.run, len - 1 );
 329
 330           assert (len);
 331           if (~p->member.run.nFlags & MERF_GRAPHICS)
 332             while (len && *(text--) == ' ')
 333               len--;
 334           if (len)
 335           {
 336               if (len == p->member.run.len)
 337                   width += p->member.run.nWidth;
 338               else
 339                   width += ME_PointFromCharContext( wc->context, &p->member.run, len, FALSE );
 340           }
 341           bSkippingSpaces = !len;
 342         } else if (!(p->member.run.nFlags & MERF_ENDPARA))
 343           width += p->member.run.nWidth;
 344       }
 345   }
 346
 347   para->nWidth = max(para->nWidth, width);
 348   row = ME_MakeRow(ascent+descent, ascent, width);
 349   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 350       (para->fmt.dwMask & PFM_TABLE) && (para->fmt.wEffects & PFE_TABLE))
 351   {
 352     /* The text was shifted down in ME_BeginRow so move the wrap context
 353      * back to where it should be. */
 354     wc->pt.y--;
 355     /* The height of the row is increased by the borders. */
 356     row->member.row.nHeight += 2;
 357   }
 358   row->member.row.pt = wc->pt;
 359   row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
 360   row->member.row.nRMargin = wc->nRightMargin;
 361   assert(para->fmt.dwMask & PFM_ALIGNMENT);
 362   align = para->fmt.wAlignment;
 363   if (align == PFA_CENTER)
 364     shift = max((wc->nAvailWidth-width)/2, 0);
 365   if (align == PFA_RIGHT)
 366     shift = max(wc->nAvailWidth-width, 0);
 367
 368   if (para->nFlags & MEPF_COMPLEX) layout_row( wc->pRowStart, pEnd );
 369
 370   row->member.row.pt.x = row->member.row.nLMargin + shift;
 371   for (p = wc->pRowStart; p!=pEnd; p = p->next)
 372   {
 373     if (p->type==diRun) { /* FIXME add more run types */
 374       p->member.run.pt.x += row->member.row.nLMargin+shift;
 375     }
 376   }
 377
 378   if (wc->nRow == 0 && para->fmt.wNumbering)
 379   {
 380     para->para_num.pt.x = wc->nParaNumOffset + shift;
 381     para->para_num.pt.y = wc->pt.y + row->member.row.nBaseline;
 382   }
 383
 384   ME_InsertBefore(wc->pRowStart, row);
 385   wc->nRow++;
 386   wc->pt.y += row->member.row.nHeight;
 387   ME_BeginRow(wc);
 388 }
 389
 390 static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
 391 {
 392   ME_DisplayItem *para = wc->pPara;
 393   PARAFORMAT2 *pFmt = &para->member.para.fmt;
 394   if (wc->pRowStart)
 395     ME_InsertRowStart(wc, p);
 396   if (wc->context->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 397       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 398   {
 399     /* ME_BeginRow was called an extra time for the paragraph, and it shifts the
 400      * text down by one pixel for the border, so fix up the wrap context. */
 401     wc->pt.y--;
 402   }
 403
 404   /*
 405   p = para->next;
 406   while(p) {
 407     if (p->type == diParagraph || p->type == diTextEnd)
 408       return;
 409     if (p->type == diRun)
 410     {
 411       ME_Run *run = &p->member.run;
 412       TRACE("%s - (%d, %d)\n", debugstr_run(run), run->pt.x, run->pt.y);
 413     }
 414     p = p->next;
 415   }
 416   */
 417 }
 418
 419 static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
 420 {
 421   /* FIXME compose style (out of character and paragraph styles) here */
 422
 423   ME_UpdateRunFlags(wc->context->editor, &p->member.run);
 424
 425   calc_run_extent(wc->context, &wc->pPara->member.para,
 426                   wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
 427 }
 428
 429
 430 static int find_non_whitespace(const WCHAR *s, int len, int start)
 431 {
 432   int i;
 433   for (i = start; i < len && ME_IsWSpace( s[i] ); i++)
 434     ;
 435
 436   return i;
 437 }
 438
 439 /* note: these two really return the first matching offset (starting from EOS)+1
 440  * in other words, an offset of the first trailing white/black */
 441
 442 /* note: returns offset of the first trailing whitespace */
 443 static int reverse_find_non_whitespace(const WCHAR *s, int start)
 444 {
 445   int i;
 446   for (i = start; i > 0 && ME_IsWSpace( s[i - 1] ); i--)
 447     ;
 448
 449   return i;
 450 }
 451
 452 /* note: returns offset of the first trailing nonwhitespace */
 453 static int reverse_find_whitespace(const WCHAR *s, int start)
 454 {
 455   int i;
 456   for (i = start; i > 0 && !ME_IsWSpace( s[i - 1] ); i--)
 457     ;
 458
 459   return i;
 460 }
 461
 462 static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
 463 {
 464   ME_DisplayItem *pp, *piter = p;
 465   int j;
 466   if (!i)
 467     return NULL;
 468   j = reverse_find_non_whitespace( get_text( &p->member.run, 0 ), i);
 469   if (j>0) {
 470     pp = split_run_extents(wc, piter, j);
 471     wc->pt.x += piter->member.run.nWidth;
 472     return pp;
 473   }
 474   else
 475   {
 476     pp = piter;
 477     /* omit all spaces before split point */
 478     while(piter != wc->pRowStart)
 479     {
 480       piter = ME_FindItemBack(piter, diRun);
 481       if (piter->member.run.nFlags & MERF_WHITESPACE)
 482       {
 483         pp = piter;
 484         continue;
 485       }
 486       if (piter->member.run.nFlags & MERF_ENDWHITE)
 487       {
 488         i = reverse_find_non_whitespace( get_text( &piter->member.run, 0 ),
 489                                          piter->member.run.len );
 490         pp = split_run_extents(wc, piter, i);
 491         wc->pt = pp->member.run.pt;
 492         return pp;
 493       }
 494       /* this run is the end of spaces, so the run edge is a good point to split */
 495       wc->pt = pp->member.run.pt;
 496       wc->bOverflown = TRUE;
 497       TRACE("Split point is: %s|%s\n", debugstr_run( &piter->member.run ), debugstr_run( &pp->member.run ));
 498       return pp;
 499     }
 500     wc->pt = piter->member.run.pt;
 501     return piter;
 502   }
 503 }
 504
 505 static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
 506 {
 507   ME_DisplayItem *piter = p, *pp;
 508   int i, idesp, len;
 509   ME_Run *run = &p->member.run;
 510
 511   idesp = i = find_split_point( wc->context, loc, run );
 512   len = run->len;
 513   assert(len>0);
 514   assert(i<len);
 515   if (i) {
 516     /* don't split words */
 517     i = reverse_find_whitespace( get_text( run, 0 ), i );
 518     pp = ME_MaximizeSplit(wc, p, i);
 519     if (pp)
 520       return pp;
 521   }
 522   TRACE("Must backtrack to split at: %s\n", debugstr_run( &p->member.run ));
 523   if (wc->pLastSplittableRun)
 524   {
 525     if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
 526     {
 527       wc->pt = wc->pLastSplittableRun->member.run.pt;
 528       return wc->pLastSplittableRun;
 529     }
 530     else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
 531     {
 532       /* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
 533          they serve no other purpose */
 534       ME_UpdateRunFlags(wc->context->editor, run);
 535       assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
 536
 537       piter = wc->pLastSplittableRun;
 538       run = &piter->member.run;
 539       len = run->len;
 540       /* don't split words */
 541       i = reverse_find_whitespace( get_text( run, 0 ), len );
 542       if (i == len)
 543         i = reverse_find_non_whitespace( get_text( run, 0 ), len );
 544       if (i) {
 545         ME_DisplayItem *piter2 = split_run_extents(wc, piter, i);
 546         wc->pt = piter2->member.run.pt;
 547         return piter2;
 548       }
 549       /* splittable = must have whitespaces */
 550       assert(0 == "Splittable, but no whitespaces");
 551     }
 552     else
 553     {
 554       /* restart from the first run beginning with spaces */
 555       wc->pt = wc->pLastSplittableRun->member.run.pt;
 556       return wc->pLastSplittableRun;
 557     }
 558   }
 559   TRACE("Backtracking failed, trying desperate: %s\n", debugstr_run( &p->member.run ));
 560   /* OK, no better idea, so assume we MAY split words if we can split at all*/
 561   if (idesp)
 562     return split_run_extents(wc, piter, idesp);
 563   else
 564   if (wc->pRowStart && piter != wc->pRowStart)
 565   {
 566     /* don't need to break current run, because it's possible to split
 567        before this run */
 568     wc->bOverflown = TRUE;
 569     return piter;
 570   }
 571   else
 572   {
 573     /* split point inside first character - no choice but split after that char */
 574     if (len != 1) {
 575       /* the run is more than 1 char, so we may split */
 576       return split_run_extents(wc, piter, 1);
 577     }
 578     /* the run is one char, can't split it */
 579     return piter;
 580   }
 581 }
 582
 583 static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
 584 {
 585   ME_DisplayItem *pp;
 586   ME_Run *run;
 587   int len;
 588
 589   assert(p->type == diRun);
 590   if (!wc->pRowStart)
 591     wc->pRowStart = p;
 592   run = &p->member.run;
 593   run->pt.x = wc->pt.x;
 594   run->pt.y = wc->pt.y;
 595   ME_WrapSizeRun(wc, p);
 596   len = run->len;
 597
 598   if (wc->bOverflown) /* just skipping final whitespaces */
 599   {
 600     /* End paragraph run can't overflow to the next line by itself. */
 601     if (run->nFlags & MERF_ENDPARA)
 602       return p->next;
 603
 604     if (run->nFlags & MERF_WHITESPACE) {
 605       wc->pt.x += run->nWidth;
 606       /* skip runs consisting of only whitespaces */
 607       return p->next;
 608     }
 609
 610     if (run->nFlags & MERF_STARTWHITE) {
 611       /* try to split the run at the first non-white char */
 612       int black;
 613       black = find_non_whitespace( get_text( run, 0 ), run->len, 0 );
 614       if (black) {
 615         wc->bOverflown = FALSE;
 616         pp = split_run_extents(wc, p, black);
 617         calc_run_extent(wc->context, &wc->pPara->member.para,
 618                         wc->nRow ? wc->nLeftMargin : wc->nFirstMargin,
 619                         &pp->member.run);
 620         ME_InsertRowStart(wc, pp);
 621         return pp;
 622       }
 623     }
 624     /* black run: the row goes from pRowStart to the previous run */
 625     ME_InsertRowStart(wc, p);
 626     return p;
 627   }
 628   /* simply end the current row and move on to next one */
 629   if (run->nFlags & MERF_ENDROW)
 630   {
 631     p = p->next;
 632     ME_InsertRowStart(wc, p);
 633     return p;
 634   }
 635
 636   /* will current run fit? */
 637   if (wc->bWordWrap &&
 638       wc->pt.x + run->nWidth - wc->context->pt.x > wc->nAvailWidth)
 639   {
 640     int loc = wc->context->pt.x + wc->nAvailWidth - wc->pt.x;
 641     /* total white run or end para */
 642     if (run->nFlags & (MERF_WHITESPACE | MERF_ENDPARA)) {
 643       /* let the overflow logic handle it */
 644       wc->bOverflown = TRUE;
 645       return p;
 646     }
 647     /* TAB: we can split before */
 648     if (run->nFlags & MERF_TAB) {
 649       wc->bOverflown = TRUE;
 650       if (wc->pRowStart == p)
 651         /* Don't split before the start of the run, or we will get an
 652          * endless loop. */
 653         return p->next;
 654       else
 655         return p;
 656     }
 657     /* graphics: we can split before, if run's width is smaller than row's width */
 658     if ((run->nFlags & MERF_GRAPHICS) && run->nWidth <= wc->nAvailWidth) {
 659       wc->bOverflown = TRUE;
 660       return p;
 661     }
 662     /* can we separate out the last spaces ? (to use overflow logic later) */
 663     if (run->nFlags & MERF_ENDWHITE)
 664     {
 665       /* we aren't sure if it's *really* necessary, it's a good start however */
 666       int black = reverse_find_non_whitespace( get_text( run, 0 ), len );
 667       split_run_extents(wc, p, black);
 668       /* handle both parts again */
 669       return p;
 670     }
 671     /* determine the split point by backtracking */
 672     pp = ME_SplitByBacktracking(wc, p, loc);
 673     if (pp == wc->pRowStart)
 674     {
 675       if (run->nFlags & MERF_STARTWHITE)
 676       {
 677           /* We had only spaces so far, so we must be on the first line of the
 678            * paragraph (or the first line after MERF_ENDROW forced the line
 679            * break within the paragraph), since no other lines of the paragraph
 680            * start with spaces. */
 681
 682           /* The lines will only contain spaces, and the rest of the run will
 683            * overflow onto the next line. */
 684           wc->bOverflown = TRUE;
 685           return p;
 686       }
 687       /* Couldn't split the first run, possible because we have a large font
 688        * with a single character that caused an overflow.
 689        */
 690       wc->pt.x += run->nWidth;
 691       return p->next;
 692     }
 693     if (p != pp) /* found a suitable split point */
 694     {
 695       wc->bOverflown = TRUE;
 696       return pp;
 697     }
 698     /* we detected that it's best to split on start of this run */
 699     if (wc->bOverflown)
 700       return pp;
 701     ERR("failure!\n");
 702     /* not found anything - writing over margins is the only option left */
 703   }
 704   if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
 705     || ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
 706   {
 707     wc->pLastSplittableRun = p;
 708   }
 709   wc->pt.x += run->nWidth;
 710   return p->next;
 711 }
 712
 713 static int ME_GetParaLineSpace(ME_Context* c, ME_Paragraph* para)
 714 {
 715   int   sp = 0, ls = 0;
 716   if (!(para->fmt.dwMask & PFM_LINESPACING)) return 0;
 717
 718   /* FIXME: how to compute simply the line space in ls ??? */
 719   /* FIXME: does line spacing include the line itself ??? */
 720   switch (para->fmt.bLineSpacingRule)
 721   {
 722   case 0:       sp = ls; break;
 723   case 1:       sp = (3 * ls) / 2; break;
 724   case 2:       sp = 2 * ls; break;
 725   case 3:       sp = ME_twips2pointsY(c, para->fmt.dyLineSpacing); if (sp < ls) sp = ls; break;
 726   case 4:       sp = ME_twips2pointsY(c, para->fmt.dyLineSpacing); break;
 727   case 5:       sp = para->fmt.dyLineSpacing / 20; break;
 728   default: FIXME("Unsupported spacing rule value %d\n", para->fmt.bLineSpacingRule);
 729   }
 730   if (c->editor->nZoomNumerator == 0)
 731     return sp;
 732   else
 733     return sp * c->editor->nZoomNumerator / c->editor->nZoomDenominator;
 734 }
 735
 736 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
 737   ME_DisplayItem *p;
 738
 739   tp->member.para.nWidth = 0;
 740   /* remove row start items as they will be reinserted by the
 741    * paragraph wrapper anyway */
 742   tp->member.para.nRows = 0;
 743   for (p = tp->next; p != tp->member.para.next_para; p = p->next) {
 744     if (p->type == diStartRow) {
 745       ME_DisplayItem *pRow = p;
 746       p = p->prev;
 747       ME_Remove(pRow);
 748       ME_DestroyDisplayItem(pRow);
 749     }
 750   }
 751   /* join runs that can be joined */
 752   for (p = tp->next; p != tp->member.para.next_para; p = p->next) {
 753     assert(p->type != diStartRow); /* should have been deleted above */
 754     if (p->type == diRun) {
 755       while (p->next->type == diRun && /* FIXME */
 756              ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
 757         ME_JoinRuns(c->editor, p);
 758       }
 759     }
 760   }
 761 }
 762
 763 static HRESULT itemize_para( ME_Context *c, ME_DisplayItem *p )
 764 {
 765     ME_Paragraph *para = &p->member.para;
 766     ME_Run *run;
 767     ME_DisplayItem *di;
 768     SCRIPT_ITEM buf[16], *items = buf;
 769     int items_passed = sizeof( buf ) / sizeof( buf[0] ), num_items, cur_item;
 770     SCRIPT_CONTROL control = { LANG_USER_DEFAULT, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE,
 771                                FALSE, FALSE, 0 };
 772     SCRIPT_STATE state = { 0, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, 0, 0 };
 773     HRESULT hr;
 774
 775     assert( p->type == diParagraph );
 776
 777     if (para->fmt.dwMask & PFM_RTLPARA && para->fmt.wEffects & PFE_RTLPARA)
 778         state.uBidiLevel = 1;
 779
 780     TRACE( "Base embedding level %d\n", state.uBidiLevel );
 781
 782     while (1)
 783     {
 784         hr = ScriptItemize( para->text->szData, para->text->nLen, items_passed, &control,
 785                             &state, items, &num_items );
 786         if (hr != E_OUTOFMEMORY) break; /* may not be enough items if hr == E_OUTOFMEMORY */
 787         if (items_passed > para->text->nLen + 1) break; /* something else has gone wrong */
 788         items_passed *= 2;
 789         if (items == buf)
 790             items = heap_alloc( items_passed * sizeof( *items ) );
 791         else
 792             items = heap_realloc( items, items_passed * sizeof( *items ) );
 793         if (!items) break;
 794     }
 795     if (FAILED( hr )) goto end;
 796
 797     if (TRACE_ON( richedit ))
 798     {
 799         TRACE( "got items:\n" );
 800         for (cur_item = 0; cur_item < num_items; cur_item++)
 801         {
 802             TRACE( "\t%d - %d RTL %d bidi level %d\n", items[cur_item].iCharPos, items[cur_item+1].iCharPos - 1,
 803                    items[cur_item].a.fRTL, items[cur_item].a.s.uBidiLevel );
 804         }
 805
 806         TRACE( "before splitting runs into ranges\n" );
 807         for (di = p->next; di != p->member.para.next_para; di = di->next)
 808         {
 809             if (di->type != diRun) continue;
 810             TRACE( "\t%d: %s\n", di->member.run.nCharOfs, debugstr_run( &di->member.run ) );
 811         }
 812     }
 813
 814     /* split runs into ranges at item boundaries */
 815     for (di = p->next, cur_item = 0; di != p->member.para.next_para; di = di->next)
 816     {
 817         if (di->type != diRun) continue;
 818         run = &di->member.run;
 819
 820         if (run->nCharOfs == items[cur_item+1].iCharPos) cur_item++;
 821
 822         items[cur_item].a.fLogicalOrder = TRUE;
 823         run->script_analysis = items[cur_item].a;
 824
 825         if (run->nFlags & MERF_ENDPARA) break; /* don't split eop runs */
 826
 827         if (run->nCharOfs + run->len > items[cur_item+1].iCharPos)
 828         {
 829             ME_Cursor cursor = {p, di, items[cur_item+1].iCharPos - run->nCharOfs};
 830             ME_SplitRunSimple( c->editor, &cursor );
 831         }
 832     }
 833
 834     if (TRACE_ON( richedit ))
 835     {
 836         TRACE( "after splitting into ranges\n" );
 837         for (di = p->next; di != p->member.para.next_para; di = di->next)
 838         {
 839             if (di->type != diRun) continue;
 840             TRACE( "\t%d: %s\n", di->member.run.nCharOfs, debugstr_run( &di->member.run ) );
 841         }
 842     }
 843
 844     para->nFlags |= MEPF_COMPLEX;
 845
 846 end:
 847     if (items != buf) heap_free( items );
 848     return hr;
 849 }
 850
 851
 852 static HRESULT shape_para( ME_Context *c, ME_DisplayItem *p )
 853 {
 854     ME_DisplayItem *di;
 855     ME_Run *run;
 856     HRESULT hr;
 857
 858     for (di = p->next; di != p->member.para.next_para; di = di->next)
 859     {
 860         if (di->type != diRun) continue;
 861         run = &di->member.run;
 862
 863         hr = shape_run( c, run );
 864         if (FAILED( hr ))
 865         {
 866             run->para->nFlags &= ~MEPF_COMPLEX;
 867             return hr;
 868         }
 869     }
 870     return hr;
 871 }
 872
 873 static void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp) {
 874   ME_DisplayItem *p;
 875   ME_WrapContext wc;
 876   int border = 0;
 877   int linespace = 0;
 878   PARAFORMAT2 *pFmt;
 879
 880   assert(tp->type == diParagraph);
 881   if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
 882     return;
 883   }
 884   ME_PrepareParagraphForWrapping(c, tp);
 885
 886   /* Calculate paragraph numbering label */
 887   para_num_init( c, &tp->member.para );
 888
 889   /* For now treating all non-password text as complex for better testing */
 890   if (!c->editor->cPasswordMask /* &&
 891       ScriptIsComplex( tp->member.para.text->szData, tp->member.para.text->nLen, SIC_COMPLEX ) == S_OK */)
 892   {
 893       if (SUCCEEDED( itemize_para( c, tp ) ))
 894           shape_para( c, tp );
 895   }
 896
 897   pFmt = &tp->member.para.fmt;
 898
 899   wc.context = c;
 900   wc.pPara = tp;
 901 /*   wc.para_style = tp->member.para.style; */
 902   wc.style = NULL;
 903   wc.nParaNumOffset = 0;
 904   if (tp->member.para.nFlags & MEPF_ROWEND) {
 905     wc.nFirstMargin = wc.nLeftMargin = wc.nRightMargin = 0;
 906   } else {
 907     int dxStartIndent = pFmt->dxStartIndent;
 908     if (tp->member.para.pCell) {
 909       dxStartIndent += ME_GetTableRowEnd(tp)->member.para.fmt.dxOffset;
 910     }
 911     wc.nLeftMargin = ME_twips2pointsX(c, dxStartIndent + pFmt->dxOffset);
 912     wc.nFirstMargin = ME_twips2pointsX(c, dxStartIndent);
 913     if (pFmt->wNumbering)
 914     {
 915         wc.nParaNumOffset = wc.nFirstMargin;
 916         dxStartIndent = max( ME_twips2pointsX(c, pFmt->wNumberingTab),
 917                              tp->member.para.para_num.width );
 918         wc.nFirstMargin += dxStartIndent;
 919     }
 920     wc.nRightMargin = ME_twips2pointsX(c, pFmt->dxRightIndent);
 921
 922     if (wc.nFirstMargin < 0)
 923         wc.nFirstMargin = 0;
 924     if (wc.nLeftMargin < 0)
 925         wc.nLeftMargin = 0;
 926   }
 927   if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 928       pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 929   {
 930     wc.nFirstMargin += ME_twips2pointsX(c, pFmt->dxOffset * 2);
 931   }
 932   wc.nRow = 0;
 933   wc.pt.y = 0;
 934   if (pFmt->dwMask & PFM_SPACEBEFORE)
 935     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceBefore);
 936   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 937       pFmt->dwMask & PFM_BORDER)
 938   {
 939     border = ME_GetParaBorderWidth(c, tp->member.para.fmt.wBorders);
 940     if (pFmt->wBorders & 1) {
 941       wc.nFirstMargin += border;
 942       wc.nLeftMargin += border;
 943     }
 944     if (pFmt->wBorders & 2)
 945       wc.nRightMargin -= border;
 946     if (pFmt->wBorders & 4)
 947       wc.pt.y += border;
 948   }
 949
 950   linespace = ME_GetParaLineSpace(c, &tp->member.para);
 951
 952   ME_BeginRow(&wc);
 953   for (p = tp->next; p!=tp->member.para.next_para; ) {
 954     assert(p->type != diStartRow);
 955     if (p->type == diRun) {
 956       p = ME_WrapHandleRun(&wc, p);
 957     }
 958     else p = p->next;
 959     if (wc.nRow && p == wc.pRowStart)
 960       wc.pt.y += linespace;
 961   }
 962   ME_WrapEndParagraph(&wc, p);
 963   if (!(pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE) &&
 964       (pFmt->dwMask & PFM_BORDER) && (pFmt->wBorders & 8))
 965     wc.pt.y += border;
 966   if (tp->member.para.fmt.dwMask & PFM_SPACEAFTER)
 967     wc.pt.y += ME_twips2pointsY(c, pFmt->dySpaceAfter);
 968
 969   tp->member.para.nFlags &= ~MEPF_REWRAP;
 970   tp->member.para.nHeight = wc.pt.y;
 971   tp->member.para.nRows = wc.nRow;
 972 }
 973
 974 static void ME_MarkRepaintEnd(ME_DisplayItem *para,
 975                               ME_DisplayItem **repaint_start,
 976                               ME_DisplayItem **repaint_end)
 977 {
 978     if (!*repaint_start)
 979       *repaint_start = para;
 980     *repaint_end = para;
 981 }
 982
 983 BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor)
 984 {
 985   ME_DisplayItem *item;
 986   ME_Context c;
 987   int totalWidth = 0;
 988   ME_DisplayItem *repaint_start = NULL, *repaint_end = NULL;
 989
 990   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 991   c.pt.x = 0;
 992   item = editor->pBuffer->pFirst->next;
 993   while(item != editor->pBuffer->pLast) {
 994     BOOL bRedraw = FALSE;
 995
 996     assert(item->type == diParagraph);
 997     if ((item->member.para.nFlags & MEPF_REWRAP)
 998      || (item->member.para.pt.y != c.pt.y))
 999       bRedraw = TRUE;
1000     item->member.para.pt = c.pt;
1001
1002     ME_WrapTextParagraph(&c, item);
1003
1004     if (bRedraw)
1005       ME_MarkRepaintEnd(item, &repaint_start, &repaint_end);
1006
1007     if (item->member.para.nFlags & MEPF_ROWSTART)
1008     {
1009       ME_DisplayItem *cell = ME_FindItemFwd(item, diCell);
1010       ME_DisplayItem *endRowPara;
1011       int borderWidth = 0;
1012       cell->member.cell.pt = c.pt;
1013       /* Offset the text by the largest top border width. */
1014       while (cell->member.cell.next_cell) {
1015         borderWidth = max(borderWidth, cell->member.cell.border.top.width);
1016         cell = cell->member.cell.next_cell;
1017       }
1018       endRowPara = ME_FindItemFwd(cell, diParagraph);
1019       assert(endRowPara->member.para.nFlags & MEPF_ROWEND);
1020       if (borderWidth > 0)
1021       {
1022         borderWidth = max(ME_twips2pointsY(&c, borderWidth), 1);
1023         while (cell) {
1024           cell->member.cell.yTextOffset = borderWidth;
1025           cell = cell->member.cell.prev_cell;
1026         }
1027         c.pt.y += borderWidth;
1028       }
1029       if (endRowPara->member.para.fmt.dxStartIndent > 0)
1030       {
1031         int dxStartIndent = endRowPara->member.para.fmt.dxStartIndent;
1032         cell = ME_FindItemFwd(item, diCell);
1033         cell->member.cell.pt.x += ME_twips2pointsX(&c, dxStartIndent);
1034         c.pt.x = cell->member.cell.pt.x;
1035       }
1036     }
1037     else if (item->member.para.nFlags & MEPF_ROWEND)
1038     {
1039       /* Set all the cells to the height of the largest cell */
1040       ME_DisplayItem *startRowPara;
1041       int prevHeight, nHeight, bottomBorder = 0;
1042       ME_DisplayItem *cell = ME_FindItemBack(item, diCell);
1043       item->member.para.nWidth = cell->member.cell.pt.x + cell->member.cell.nWidth;
1044       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWSTART))
1045       {
1046         /* Last row, the bottom border is added to the height. */
1047         cell = cell->member.cell.prev_cell;
1048         while (cell)
1049         {
1050           bottomBorder = max(bottomBorder, cell->member.cell.border.bottom.width);
1051           cell = cell->member.cell.prev_cell;
1052         }
1053         bottomBorder = ME_twips2pointsY(&c, bottomBorder);
1054         cell = ME_FindItemBack(item, diCell);
1055       }
1056       prevHeight = cell->member.cell.nHeight;
1057       nHeight = cell->member.cell.prev_cell->member.cell.nHeight + bottomBorder;
1058       cell->member.cell.nHeight = nHeight;
1059       item->member.para.nHeight = nHeight;
1060       cell = cell->member.cell.prev_cell;
1061       cell->member.cell.nHeight = nHeight;
1062       while (cell->member.cell.prev_cell)
1063       {
1064         cell = cell->member.cell.prev_cell;
1065         cell->member.cell.nHeight = nHeight;
1066       }
1067       /* Also set the height of the start row paragraph */
1068       startRowPara = ME_FindItemBack(cell, diParagraph);
1069       startRowPara->member.para.nHeight = nHeight;
1070       c.pt.x = startRowPara->member.para.pt.x;
1071       c.pt.y = cell->member.cell.pt.y + nHeight;
1072       if (prevHeight < nHeight)
1073       {
1074         /* The height of the cells has grown, so invalidate the bottom of
1075          * the cells. */
1076         ME_MarkRepaintEnd(item, &repaint_start, &repaint_end);
1077         cell = ME_FindItemBack(item, diCell);
1078         while (cell) {
1079           ME_MarkRepaintEnd(ME_FindItemBack(cell, diParagraph), &repaint_start, &repaint_end);
1080           cell = cell->member.cell.prev_cell;
1081         }
1082       }
1083     }
1084     else if (item->member.para.pCell &&
1085              item->member.para.pCell != item->member.para.next_para->member.para.pCell)
1086     {
1087       /* The next paragraph is in the next cell in the table row. */
1088       ME_Cell *cell = &item->member.para.pCell->member.cell;
1089       cell->nHeight = c.pt.y + item->member.para.nHeight - cell->pt.y;
1090
1091       /* Propagate the largest height to the end so that it can be easily
1092        * sent back to all the cells at the end of the row. */
1093       if (cell->prev_cell)
1094         cell->nHeight = max(cell->nHeight, cell->prev_cell->member.cell.nHeight);
1095
1096       c.pt.x = cell->pt.x + cell->nWidth;
1097       c.pt.y = cell->pt.y;
1098       cell->next_cell->member.cell.pt = c.pt;
1099       if (!(item->member.para.next_para->member.para.nFlags & MEPF_ROWEND))
1100         c.pt.y += cell->yTextOffset;
1101     }
1102     else
1103     {
1104       if (item->member.para.pCell) {
1105         /* Next paragraph in the same cell. */
1106         c.pt.x = item->member.para.pCell->member.cell.pt.x;
1107       } else {
1108         /* Normal paragraph */
1109         c.pt.x = 0;
1110       }
1111       c.pt.y += item->member.para.nHeight;
1112     }
1113
1114     totalWidth = max(totalWidth, item->member.para.nWidth);
1115     item = item->member.para.next_para;
1116   }
1117   editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
1118   editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
1119
1120   editor->nTotalLength = c.pt.y;
1121   editor->nTotalWidth = totalWidth;
1122   editor->pBuffer->pLast->member.para.pt.x = 0;
1123   editor->pBuffer->pLast->member.para.pt.y = c.pt.y;
1124
1125   ME_DestroyContext(&c);
1126
1127   if (repaint_start || editor->nTotalLength < editor->nLastTotalLength)
1128     ME_InvalidateParagraphRange(editor, repaint_start, repaint_end);
1129   return !!repaint_start;
1130 }
1131
1132 void ME_InvalidateParagraphRange(ME_TextEditor *editor,
1133                                  ME_DisplayItem *start_para,
1134                                  ME_DisplayItem *last_para)
1135 {
1136   ME_Context c;
1137   RECT rc;
1138   int ofs;
1139
1140   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
1141   rc = c.rcView;
1142   ofs = editor->vert_si.nPos;
1143
1144   if (start_para) {
1145     start_para = ME_GetOuterParagraph(start_para);
1146     last_para = ME_GetOuterParagraph(last_para);
1147     rc.top = c.rcView.top + start_para->member.para.pt.y - ofs;
1148   } else {
1149     rc.top = c.rcView.top + editor->nTotalLength - ofs;
1150   }
1151   if (editor->nTotalLength < editor->nLastTotalLength)
1152     rc.bottom = c.rcView.top + editor->nLastTotalLength - ofs;
1153   else
1154     rc.bottom = c.rcView.top + last_para->member.para.pt.y + last_para->member.para.nHeight - ofs;
1155   ITextHost_TxInvalidateRect(editor->texthost, &rc, TRUE);
1156
1157   ME_DestroyContext(&c);
1158 }
1159
1160
1161 void
1162 ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
1163 {
1164   if (editor->nEventMask & ENM_REQUESTRESIZE)
1165   {
1166     RECT rc;
1167
1168     ITextHost_TxGetClientRect(editor->texthost, &rc);
1169
1170     if (force || rc.bottom != editor->nTotalLength)
1171     {
1172       REQRESIZE info;
1173
1174       info.nmhdr.hwndFrom = NULL;
1175       info.nmhdr.idFrom = 0;
1176       info.nmhdr.code = EN_REQUESTRESIZE;
1177       info.rc = rc;
1178       info.rc.right = editor->nTotalWidth;
1179       info.rc.bottom = editor->nTotalLength;
1180
1181       editor->nEventMask &= ~ENM_REQUESTRESIZE;
1182       ITextHost_TxNotify(editor->texthost, info.nmhdr.code, &info);
1183       editor->nEventMask |= ENM_REQUESTRESIZE;
1184     }
1185   }
1186 }