dlls/riched20/run.c

   1 /*
   2  * RichEdit - operations on runs (diRun, rectangular pieces of paragraphs).
   3  * Splitting/joining runs. Adjusting offsets after deleting/adding content.
   4  * Character/pixel conversions.
   5  *
   6  * Copyright 2004 by Krzysztof Foltman
   7  * Copyright 2006 by Phil Krylov
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 #include "editor.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  27 WINE_DECLARE_DEBUG_CHANNEL(richedit_check);
  28 WINE_DECLARE_DEBUG_CHANNEL(richedit_lists);
  29
  30 /******************************************************************************
  31  * ME_CanJoinRuns
  32  *
  33  * Returns TRUE if two runs can be safely merged into one, FALSE otherwise.
  34  */
  35 BOOL ME_CanJoinRuns(const ME_Run *run1, const ME_Run *run2)
  36 {
  37   if ((run1->nFlags | run2->nFlags) & MERF_NOJOIN)
  38     return FALSE;
  39   if (run1->style != run2->style)
  40     return FALSE;
  41   if ((run1->nFlags & MERF_STYLEFLAGS) != (run2->nFlags & MERF_STYLEFLAGS))
  42     return FALSE;
  43   return TRUE;
  44 }
  45
  46 void ME_SkipAndPropagateCharOffset(ME_DisplayItem *p, int shift)
  47 {
  48   p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  49   assert(p);
  50   ME_PropagateCharOffset(p, shift);
  51 }
  52
  53 /******************************************************************************
  54  * ME_PropagateCharOffsets
  55  *
  56  * Shifts (increases or decreases) character offset (relative to beginning of
  57  * the document) of the part of the text starting from given place.
  58  */
  59 void ME_PropagateCharOffset(ME_DisplayItem *p, int shift)
  60 {
  61         /* Runs in one paragraph contain character offset relative to their owning
  62          * paragraph. If we start the shifting from the run, we need to shift
  63          * all the relative offsets until the end of the paragraph
  64          */
  65   if (p->type == diRun) /* propagate in all runs in this para */
  66   {
  67     TRACE("PropagateCharOffset(%s, %d)\n", debugstr_run( &p->member.run ), shift);
  68     do {
  69       p->member.run.nCharOfs += shift;
  70       assert(p->member.run.nCharOfs >= 0);
  71       p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  72     } while(p->type == diRun);
  73   }
  74         /* Runs in next paragraphs don't need their offsets updated, because they,
  75          * again, those offsets are relative to their respective paragraphs.
  76          * Instead of that, we're updating paragraphs' character offsets.
  77          */
  78   if (p->type == diParagraph) /* propagate in all next paras */
  79   {
  80     do {
  81       p->member.para.nCharOfs += shift;
  82       assert(p->member.para.nCharOfs >= 0);
  83       p = p->member.para.next_para;
  84     } while(p->type == diParagraph);
  85   }
  86   /* diTextEnd also has character offset in it, which makes finding text length
  87    * easier. But it needs to be up to date first.
  88    */
  89   if (p->type == diTextEnd)
  90   {
  91     p->member.para.nCharOfs += shift;
  92     assert(p->member.para.nCharOfs >= 0);
  93   }
  94 }
  95
  96 /******************************************************************************
  97  * ME_CheckCharOffsets
  98  *
  99  * Checks if editor lists' validity and optionally dumps the document structure
 100  */
 101 void ME_CheckCharOffsets(ME_TextEditor *editor)
 102 {
 103   ME_DisplayItem *p = editor->pBuffer->pFirst;
 104   int ofs = 0, ofsp = 0;
 105
 106   TRACE_(richedit_check)("Checking begin\n");
 107   if(TRACE_ON(richedit_lists))
 108   {
 109     TRACE_(richedit_lists)("---\n");
 110     ME_DumpDocument(editor->pBuffer);
 111   }
 112   do {
 113     p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
 114     switch(p->type) {
 115       case diTextEnd:
 116         TRACE_(richedit_check)("tend, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
 117         assert(ofsp+ofs == p->member.para.nCharOfs);
 118         TRACE_(richedit_check)("Checking finished\n");
 119         return;
 120       case diParagraph:
 121         TRACE_(richedit_check)("para, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
 122         assert(ofsp+ofs == p->member.para.nCharOfs);
 123         ofsp = p->member.para.nCharOfs;
 124         ofs = 0;
 125         break;
 126       case diRun:
 127         TRACE_(richedit_check)("run, real ofs = %d (+ofsp = %d), counted = %d, len = %d, txt = %s, flags=%08x, fx&mask = %08x\n",
 128           p->member.run.nCharOfs, p->member.run.nCharOfs+ofsp, ofsp+ofs,
 129           p->member.run.len, debugstr_run( &p->member.run ),
 130           p->member.run.nFlags,
 131           p->member.run.style->fmt.dwMask & p->member.run.style->fmt.dwEffects);
 132         assert(ofs == p->member.run.nCharOfs);
 133         assert(p->member.run.len);
 134         ofs += p->member.run.len;
 135         break;
 136       case diCell:
 137         TRACE_(richedit_check)("cell\n");
 138         break;
 139       default:
 140         assert(0);
 141     }
 142   } while(1);
 143   TRACE_(richedit_check)("Checking finished\n");
 144 }
 145
 146 /******************************************************************************
 147  * ME_CharOfsFromRunOfs
 148  *
 149  * Converts a character position relative to the start of the run, to a
 150  * character position relative to the start of the document.
 151  * Kind of a "local to global" offset conversion.
 152  */
 153 int ME_CharOfsFromRunOfs(ME_TextEditor *editor, const ME_DisplayItem *pPara,
 154                          const ME_DisplayItem *pRun, int nOfs)
 155 {
 156   assert(pRun && pRun->type == diRun);
 157   assert(pPara && pPara->type == diParagraph);
 158   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs + nOfs;
 159 }
 160
 161 /******************************************************************************
 162  * ME_CursorFromCharOfs
 163  *
 164  * Converts a character offset (relative to the start of the document) to
 165  * a cursor structure (which contains a run and a position relative to that
 166  * run).
 167  */
 168 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 169 {
 170   ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pPara,
 171                        &pCursor->pRun, &pCursor->nOffset);
 172 }
 173
 174 /******************************************************************************
 175  * ME_RunOfsFromCharOfs
 176  *
 177  * Find a run and relative character offset given an absolute character offset
 178  * (absolute offset being an offset relative to the start of the document).
 179  * Kind of a "global to local" offset conversion.
 180  */
 181 void ME_RunOfsFromCharOfs(ME_TextEditor *editor,
 182                           int nCharOfs,
 183                           ME_DisplayItem **ppPara,
 184                           ME_DisplayItem **ppRun,
 185                           int *pOfs)
 186 {
 187   ME_DisplayItem *item, *next_item;
 188
 189   nCharOfs = max(nCharOfs, 0);
 190   nCharOfs = min(nCharOfs, ME_GetTextLength(editor));
 191
 192   /* Find the paragraph at the offset. */
 193   next_item = editor->pBuffer->pFirst->member.para.next_para;
 194   do {
 195     item = next_item;
 196     next_item = item->member.para.next_para;
 197   } while (next_item->member.para.nCharOfs <= nCharOfs);
 198   assert(item->type == diParagraph);
 199   nCharOfs -= item->member.para.nCharOfs;
 200   if (ppPara) *ppPara = item;
 201
 202   /* Find the run at the offset. */
 203   next_item = ME_FindItemFwd(item, diRun);
 204   do {
 205     item = next_item;
 206     next_item = ME_FindItemFwd(item, diRunOrParagraphOrEnd);
 207   } while (next_item->type == diRun &&
 208            next_item->member.run.nCharOfs <= nCharOfs);
 209   assert(item->type == diRun);
 210   nCharOfs -= item->member.run.nCharOfs;
 211
 212   if (ppRun) *ppRun = item;
 213   if (pOfs) *pOfs = nCharOfs;
 214 }
 215
 216 /******************************************************************************
 217  * ME_JoinRuns
 218  *
 219  * Merges two adjacent runs, the one given as a parameter and the next one.
 220  */
 221 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 222 {
 223   ME_DisplayItem *pNext = p->next;
 224   int i;
 225   assert(p->type == diRun && pNext->type == diRun);
 226   assert(p->member.run.nCharOfs != -1);
 227   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 228
 229   /* Update all cursors so that they don't contain the soon deleted run */
 230   for (i=0; i<editor->nCursors; i++) {
 231     if (editor->pCursors[i].pRun == pNext) {
 232       editor->pCursors[i].pRun = p;
 233       editor->pCursors[i].nOffset += p->member.run.len;
 234     }
 235   }
 236
 237   p->member.run.len += pNext->member.run.len;
 238   ME_Remove(pNext);
 239   ME_DestroyDisplayItem(pNext);
 240   ME_UpdateRunFlags(editor, &p->member.run);
 241   if(TRACE_ON(richedit_check))
 242     ME_CheckCharOffsets(editor);
 243 }
 244
 245 /******************************************************************************
 246  * ME_SplitRunSimple
 247  *
 248  * Does the most basic job of splitting a run into two - it does not
 249  * update the positions and extents.
 250  */
 251 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_Cursor *cursor)
 252 {
 253   ME_DisplayItem *run = cursor->pRun;
 254   ME_DisplayItem *new_run;
 255   int i;
 256   int nOffset = cursor->nOffset;
 257
 258   assert(!(run->member.run.nFlags & MERF_NONTEXT));
 259
 260   new_run = ME_MakeRun(run->member.run.style,
 261                        run->member.run.nFlags & MERF_SPLITMASK);
 262   new_run->member.run.nCharOfs = run->member.run.nCharOfs + nOffset;
 263   new_run->member.run.len = run->member.run.len - nOffset;
 264   new_run->member.run.para = run->member.run.para;
 265   run->member.run.len = nOffset;
 266   cursor->pRun = new_run;
 267   cursor->nOffset = 0;
 268
 269   ME_InsertBefore(run->next, new_run);
 270
 271   ME_UpdateRunFlags(editor, &run->member.run);
 272   ME_UpdateRunFlags(editor, &new_run->member.run);
 273   for (i = 0; i < editor->nCursors; i++) {
 274     if (editor->pCursors[i].pRun == run &&
 275         editor->pCursors[i].nOffset >= nOffset) {
 276       editor->pCursors[i].pRun = new_run;
 277       editor->pCursors[i].nOffset -= nOffset;
 278     }
 279   }
 280   cursor->pPara->member.para.nFlags |= MEPF_REWRAP;
 281   return run;
 282 }
 283
 284 /******************************************************************************
 285  * ME_MakeRun
 286  *
 287  * A helper function to create run structures quickly.
 288  */
 289 ME_DisplayItem *ME_MakeRun(ME_Style *s, int nFlags)
 290 {
 291   ME_DisplayItem *item = ME_MakeDI(diRun);
 292   item->member.run.style = s;
 293   item->member.run.ole_obj = NULL;
 294   item->member.run.nFlags = nFlags;
 295   item->member.run.nCharOfs = -1;
 296   item->member.run.len = 0;
 297   item->member.run.para = NULL;
 298   item->member.run.num_glyphs = 0;
 299   item->member.run.max_glyphs = 0;
 300   item->member.run.glyphs = NULL;
 301   item->member.run.vis_attrs = NULL;
 302   item->member.run.advances = NULL;
 303   item->member.run.offsets = NULL;
 304   item->member.run.max_clusters = 0;
 305   item->member.run.clusters = NULL;
 306   ME_AddRefStyle(s);
 307   return item;
 308 }
 309
 310 /******************************************************************************
 311  * ME_InsertRunAtCursor
 312  *
 313  * Inserts a new run with given style, flags and content at a given position,
 314  * which is passed as a cursor structure (which consists of a run and
 315  * a run-relative character offset).
 316  */
 317 ME_DisplayItem *
 318 ME_InsertRunAtCursor(ME_TextEditor *editor, ME_Cursor *cursor, ME_Style *style,
 319                      const WCHAR *str, int len, int flags)
 320 {
 321   ME_DisplayItem *pDI, *insert_before = cursor->pRun, *prev;
 322
 323   if (cursor->nOffset)
 324   {
 325     if (cursor->nOffset == cursor->pRun->member.run.len)
 326     {
 327       insert_before = ME_FindItemFwd( cursor->pRun, diRun );
 328       if (!insert_before) insert_before = cursor->pRun; /* Always insert before the final eop run */
 329     }
 330     else
 331     {
 332       ME_SplitRunSimple( editor, cursor );
 333       insert_before = cursor->pRun;
 334     }
 335   }
 336
 337   add_undo_delete_run( editor, insert_before->member.run.para->nCharOfs +
 338                        insert_before->member.run.nCharOfs, len );
 339
 340   pDI = ME_MakeRun(style, flags);
 341   pDI->member.run.nCharOfs = insert_before->member.run.nCharOfs;
 342   pDI->member.run.len = len;
 343   pDI->member.run.para = insert_before->member.run.para;
 344   ME_InsertString( pDI->member.run.para->text, pDI->member.run.nCharOfs, str, len );
 345   ME_InsertBefore( insert_before, pDI );
 346   TRACE("Shift length:%d\n", len);
 347   ME_PropagateCharOffset( insert_before, len );
 348   insert_before->member.run.para->nFlags |= MEPF_REWRAP;
 349
 350   /* Move any cursors that were at the end of the previous run to the end of the inserted run */
 351   prev = ME_FindItemBack( pDI, diRun );
 352   if (prev)
 353   {
 354     int i;
 355
 356     for (i = 0; i < editor->nCursors; i++)
 357     {
 358       if (editor->pCursors[i].pRun == prev &&
 359           editor->pCursors[i].nOffset == prev->member.run.len)
 360       {
 361         editor->pCursors[i].pRun = pDI;
 362         editor->pCursors[i].nOffset = len;
 363       }
 364     }
 365   }
 366
 367   return pDI;
 368 }
 369
 370 static BOOL run_is_splittable( const ME_Run *run )
 371 {
 372     WCHAR *str = get_text( run, 0 ), *p;
 373     int i;
 374     BOOL found_ink = FALSE;
 375
 376     for (i = 0, p = str; i < run->len; i++, p++)
 377     {
 378         if (ME_IsWSpace( *p ))
 379         {
 380             if (found_ink) return TRUE;
 381         }
 382         else
 383             found_ink = TRUE;
 384     }
 385     return FALSE;
 386 }
 387
 388 static BOOL run_is_entirely_ws( const ME_Run *run )
 389 {
 390     WCHAR *str = get_text( run, 0 ), *p;
 391     int i;
 392
 393     for (i = 0, p = str; i < run->len; i++, p++)
 394         if (!ME_IsWSpace( *p )) return FALSE;
 395
 396     return TRUE;
 397 }
 398
 399 /******************************************************************************
 400  * ME_UpdateRunFlags
 401  *
 402  * Determine some of run attributes given its content (style, text content).
 403  * Some flags cannot be determined by this function (MERF_GRAPHICS,
 404  * MERF_ENDPARA)
 405  */
 406 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 407 {
 408   assert(run->nCharOfs >= 0);
 409
 410   if (RUN_IS_HIDDEN(run) || run->nFlags & MERF_TABLESTART)
 411     run->nFlags |= MERF_HIDDEN;
 412   else
 413     run->nFlags &= ~MERF_HIDDEN;
 414
 415   if (run_is_splittable( run ))
 416     run->nFlags |= MERF_SPLITTABLE;
 417   else
 418     run->nFlags &= ~MERF_SPLITTABLE;
 419
 420   if (!(run->nFlags & MERF_NOTEXT))
 421   {
 422     if (run_is_entirely_ws( run ))
 423       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 424     else
 425     {
 426       run->nFlags &= ~MERF_WHITESPACE;
 427
 428       if (ME_IsWSpace( *get_text( run, 0 ) ))
 429         run->nFlags |= MERF_STARTWHITE;
 430       else
 431         run->nFlags &= ~MERF_STARTWHITE;
 432
 433       if (ME_IsWSpace( *get_text( run, run->len - 1 ) ))
 434         run->nFlags |= MERF_ENDWHITE;
 435       else
 436         run->nFlags &= ~MERF_ENDWHITE;
 437     }
 438   }
 439   else
 440     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 441 }
 442
 443 /******************************************************************************
 444  * ME_CharFromPointContext
 445  *
 446  * Returns a character position inside the run given a run-relative
 447  * pixel horizontal position.
 448  *
 449  * If closest is FALSE return the actual character
 450  * If closest is TRUE will round to the closest leading edge.
 451  * ie. if the second character is at pixel position 8 and third at 16 then for:
 452  * closest = FALSE cx = 0..7 return 0, cx = 8..15 return 1
 453  * closest = TRUE  cx = 0..3 return 0, cx = 4..11 return 1.
 454  */
 455 int ME_CharFromPointContext(ME_Context *c, int cx, ME_Run *run, BOOL closest, BOOL visual_order)
 456 {
 457   ME_String *mask_text = NULL;
 458   WCHAR *str;
 459   int fit = 0;
 460   HGDIOBJ hOldFont;
 461   SIZE sz, sz2, sz3;
 462   if (!run->len || cx <= 0)
 463     return 0;
 464
 465   if (run->nFlags & (MERF_TAB | MERF_ENDCELL))
 466   {
 467     if (!closest || cx < run->nWidth / 2) return 0;
 468     return 1;
 469   }
 470
 471   if (run->nFlags & MERF_GRAPHICS)
 472   {
 473     SIZE sz;
 474     ME_GetOLEObjectSize(c, run, &sz);
 475     if (!closest || cx < sz.cx / 2) return 0;
 476     return 1;
 477   }
 478
 479   if (run->para->nFlags & MEPF_COMPLEX)
 480   {
 481       int cp, trailing;
 482       if (visual_order && run->script_analysis.fRTL) cx = run->nWidth - cx - 1;
 483
 484       ScriptXtoCP( cx, run->len, run->num_glyphs, run->clusters, run->vis_attrs, run->advances, &run->script_analysis,
 485                    &cp, &trailing );
 486       TRACE("x %d cp %d trailing %d (run width %d) rtl %d log order %d\n", cx, cp, trailing, run->nWidth,
 487             run->script_analysis.fRTL, run->script_analysis.fLogicalOrder);
 488       return closest ? cp + trailing : cp;
 489   }
 490
 491   if (c->editor->cPasswordMask)
 492   {
 493     mask_text = ME_MakeStringR( c->editor->cPasswordMask, run->len );
 494     str = mask_text->szData;
 495   }
 496   else
 497     str = get_text( run, 0 );
 498
 499   hOldFont = ME_SelectStyleFont(c, run->style);
 500   GetTextExtentExPointW(c->hDC, str, run->len,
 501                         cx, &fit, NULL, &sz);
 502   if (closest && fit != run->len)
 503   {
 504     GetTextExtentPoint32W(c->hDC, str, fit, &sz2);
 505     GetTextExtentPoint32W(c->hDC, str, fit + 1, &sz3);
 506     if (cx >= (sz2.cx+sz3.cx)/2)
 507       fit = fit + 1;
 508   }
 509
 510   ME_DestroyString( mask_text );
 511
 512   ME_UnselectStyleFont(c, run->style, hOldFont);
 513   return fit;
 514 }
 515
 516 int ME_CharFromPoint(ME_TextEditor *editor, int cx, ME_Run *run, BOOL closest, BOOL visual_order)
 517 {
 518     ME_Context c;
 519     int ret;
 520
 521     ME_InitContext( &c, editor, ITextHost_TxGetDC( editor->texthost ) );
 522     ret = ME_CharFromPointContext( &c, cx, run, closest, visual_order );
 523     ME_DestroyContext(&c);
 524     return ret;
 525 }
 526
 527 /******************************************************************************
 528  * ME_GetTextExtent
 529  *
 530  * Finds a width and a height of the text using a specified style
 531  */
 532 static void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s, SIZE *size)
 533 {
 534   HGDIOBJ hOldFont;
 535   if (c->hDC) {
 536     hOldFont = ME_SelectStyleFont(c, s);
 537     GetTextExtentPoint32W(c->hDC, szText, nChars, size);
 538     ME_UnselectStyleFont(c, s, hOldFont);
 539   } else {
 540     size->cx = 0;
 541     size->cy = 0;
 542   }
 543 }
 544
 545 /******************************************************************************
 546  * ME_PointFromCharContext
 547  *
 548  * Returns a run-relative pixel position given a run-relative character
 549  * position (character offset)
 550  */
 551 int ME_PointFromCharContext(ME_Context *c, ME_Run *pRun, int nOffset, BOOL visual_order)
 552 {
 553   SIZE size;
 554   ME_String *mask_text = NULL;
 555   WCHAR *str;
 556
 557   if (pRun->nFlags & MERF_GRAPHICS)
 558   {
 559     if (nOffset)
 560       ME_GetOLEObjectSize(c, pRun, &size);
 561     return nOffset != 0;
 562   } else if (pRun->nFlags & MERF_ENDPARA) {
 563     nOffset = 0;
 564   }
 565
 566   if (pRun->para->nFlags & MEPF_COMPLEX)
 567   {
 568       int x;
 569       ScriptCPtoX( nOffset, FALSE, pRun->len, pRun->num_glyphs, pRun->clusters,
 570                    pRun->vis_attrs, pRun->advances, &pRun->script_analysis, &x );
 571       if (visual_order && pRun->script_analysis.fRTL) x = pRun->nWidth - x - 1;
 572       return x;
 573   }
 574   if (c->editor->cPasswordMask)
 575   {
 576     mask_text = ME_MakeStringR(c->editor->cPasswordMask, pRun->len);
 577     str = mask_text->szData;
 578   }
 579   else
 580       str = get_text( pRun, 0 );
 581
 582   ME_GetTextExtent(c, str, nOffset, pRun->style, &size);
 583   ME_DestroyString( mask_text );
 584   return size.cx;
 585 }
 586
 587 /******************************************************************************
 588  * ME_PointFromChar
 589  *
 590  * Calls ME_PointFromCharContext after first creating a context.
 591  */
 592 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset, BOOL visual_order)
 593 {
 594     ME_Context c;
 595     int ret;
 596
 597     ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 598     ret = ME_PointFromCharContext( &c, pRun, nOffset, visual_order );
 599     ME_DestroyContext(&c);
 600
 601     return ret;
 602 }
 603
 604 /******************************************************************************
 605  * ME_GetRunSizeCommon
 606  *
 607  * Finds width, height, ascent and descent of a run, up to given character
 608  * (nLen).
 609  */
 610 SIZE ME_GetRunSizeCommon(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen,
 611                          int startx, int *pAscent, int *pDescent)
 612 {
 613   SIZE size;
 614   WCHAR spaceW[] = {' ',0};
 615
 616   nLen = min( nLen, run->len );
 617
 618   if (run->nFlags & MERF_ENDPARA)
 619   {
 620       nLen = min( nLen, 1 );
 621       ME_GetTextExtent(c, spaceW, nLen, run->style, &size);
 622   }
 623   else if (para->nFlags & MEPF_COMPLEX)
 624   {
 625       size.cx = run->nWidth;
 626   }
 627   else if (c->editor->cPasswordMask)
 628   {
 629     ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,nLen);
 630     ME_GetTextExtent(c, szMasked->szData, nLen,run->style, &size);
 631     ME_DestroyString(szMasked);
 632   }
 633   else
 634   {
 635     ME_GetTextExtent(c, get_text( run, 0 ), nLen, run->style, &size);
 636   }
 637   *pAscent = run->style->tm.tmAscent;
 638   *pDescent = run->style->tm.tmDescent;
 639   size.cy = *pAscent + *pDescent;
 640
 641   if (run->nFlags & MERF_TAB)
 642   {
 643     int pos = 0, i = 0, ppos, shift = 0;
 644     const PARAFORMAT2 *pFmt = &para->fmt;
 645
 646     if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 647         pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 648       /* The horizontal gap shifts the tab positions to leave the gap. */
 649       shift = pFmt->dxOffset * 2;
 650     do {
 651       if (i < pFmt->cTabCount)
 652       {
 653         /* Only one side of the horizontal gap is needed at the end of
 654          * the table row. */
 655         if (i == pFmt->cTabCount -1)
 656           shift = shift >> 1;
 657         pos = shift + (pFmt->rgxTabs[i]&0x00FFFFFF);
 658         i++;
 659       }
 660       else
 661       {
 662         pos += lDefaultTab - (pos % lDefaultTab);
 663       }
 664       ppos = ME_twips2pointsX(c, pos);
 665       if (ppos > startx + run->pt.x) {
 666         size.cx = ppos - startx - run->pt.x;
 667         break;
 668       }
 669     } while(1);
 670     size.cy = *pAscent + *pDescent;
 671     return size;
 672   }
 673   if (run->nFlags & MERF_GRAPHICS)
 674   {
 675     ME_GetOLEObjectSize(c, run, &size);
 676     if (size.cy > *pAscent)
 677       *pAscent = size.cy;
 678     /* descent is unchanged */
 679     return size;
 680   }
 681   return size;
 682 }
 683
 684 /******************************************************************************
 685  * ME_SetSelectionCharFormat
 686  *
 687  * Applies a style change, either to a current selection, or to insert cursor
 688  * (ie. the style next typed characters will use).
 689  */
 690 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 691 {
 692   if (!ME_IsSelection(editor))
 693   {
 694     ME_Style *s;
 695     if (!editor->pBuffer->pCharStyle)
 696       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 697     s = ME_ApplyStyle(editor, editor->pBuffer->pCharStyle, pFmt);
 698     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 699     editor->pBuffer->pCharStyle = s;
 700   } else {
 701     ME_Cursor *from, *to;
 702     ME_GetSelection(editor, &from, &to);
 703     ME_SetCharFormat(editor, from, to, pFmt);
 704   }
 705 }
 706
 707 /******************************************************************************
 708  * ME_SetCharFormat
 709  *
 710  * Applies a style change to the specified part of the text
 711  *
 712  * The start and end cursors specify the part of the text.  These cursors will
 713  * be updated to stay valid, but this function may invalidate other
 714  * non-selection cursors. The end cursor may be NULL to specify all the text
 715  * following the start cursor.
 716  *
 717  * If no text is selected, then nothing is done.
 718  */
 719 void ME_SetCharFormat(ME_TextEditor *editor, ME_Cursor *start, ME_Cursor *end, CHARFORMAT2W *pFmt)
 720 {
 721   ME_DisplayItem *run, *start_run = start->pRun, *end_run = NULL;
 722
 723   if (end && start->pRun == end->pRun && start->nOffset == end->nOffset)
 724     return;
 725
 726   if (start->nOffset == start->pRun->member.run.len)
 727     start_run = ME_FindItemFwd( start->pRun, diRun );
 728   else if (start->nOffset)
 729   {
 730     /* SplitRunSimple may or may not update the cursors, depending on whether they
 731      * are selection cursors, but we need to make sure they are valid. */
 732     int split_offset = start->nOffset;
 733     ME_DisplayItem *split_run = ME_SplitRunSimple(editor, start);
 734     start_run = start->pRun;
 735     if (end && end->pRun == split_run)
 736     {
 737       end->pRun = start->pRun;
 738       end->nOffset -= split_offset;
 739     }
 740   }
 741
 742   if (end)
 743   {
 744     if (end->nOffset == end->pRun->member.run.len)
 745       end_run = ME_FindItemFwd( end->pRun, diRun );
 746     else
 747     {
 748       if (end->nOffset) ME_SplitRunSimple(editor, end);
 749       end_run = end->pRun;
 750     }
 751   }
 752
 753   for (run = start_run; run != end_run; run = ME_FindItemFwd( run, diRun ))
 754   {
 755     ME_Style *new_style = ME_ApplyStyle(editor, run->member.run.style, pFmt);
 756     ME_Paragraph *para = run->member.run.para;
 757
 758     add_undo_set_char_fmt( editor, run->member.run.para->nCharOfs + run->member.run.nCharOfs,
 759                            run->member.run.len, &run->member.run.style->fmt );
 760     ME_ReleaseStyle(run->member.run.style);
 761     run->member.run.style = new_style;
 762
 763     /* The para numbering style depends on the eop style */
 764     if ((run->member.run.nFlags & MERF_ENDPARA) && para->para_num.style)
 765     {
 766       ME_ReleaseStyle(para->para_num.style);
 767       para->para_num.style = NULL;
 768     }
 769     para->nFlags |= MEPF_REWRAP;
 770   }
 771 }
 772
 773 static void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 774 {
 775   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 776 }
 777
 778 /******************************************************************************
 779  * ME_GetDefaultCharFormat
 780  *
 781  * Retrieves the current default character style (the one applied where no
 782  * other style was applied) .
 783  */
 784 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 785 {
 786   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 787 }
 788
 789 /******************************************************************************
 790  * ME_GetSelectionCharFormat
 791  *
 792  * If selection exists, it returns all style elements that are set consistently
 793  * in the whole selection. If not, it just returns the current style.
 794  */
 795 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 796 {
 797   ME_Cursor *from, *to;
 798   if (!ME_IsSelection(editor) && editor->pBuffer->pCharStyle)
 799   {
 800     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 801     return;
 802   }
 803   ME_GetSelection(editor, &from, &to);
 804   ME_GetCharFormat(editor, from, to, pFmt);
 805 }
 806
 807 /******************************************************************************
 808  * ME_GetCharFormat
 809  *
 810  * Returns the style consisting of those attributes which are consistently set
 811  * in the whole character range.
 812  */
 813 void ME_GetCharFormat(ME_TextEditor *editor, const ME_Cursor *from,
 814                       const ME_Cursor *to, CHARFORMAT2W *pFmt)
 815 {
 816   ME_DisplayItem *run, *run_end;
 817   CHARFORMAT2W tmp;
 818
 819   run = from->pRun;
 820   /* special case - if selection is empty, take previous char's formatting */
 821   if (from->pRun == to->pRun && from->nOffset == to->nOffset)
 822   {
 823     if (!from->nOffset)
 824     {
 825       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 826       if (tmp_run->type == diRun) {
 827         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 828         return;
 829       }
 830     }
 831     ME_GetRunCharFormat(editor, run, pFmt);
 832     return;
 833   }
 834
 835   run_end = to->pRun;
 836   if (!to->nOffset)
 837     run_end = ME_FindItemBack(run_end, diRun);
 838
 839   ME_GetRunCharFormat(editor, run, pFmt);
 840
 841   if (run == run_end) return;
 842
 843   do {
 844     /* FIXME add more style feature comparisons */
 845     DWORD dwAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_UNDERLINETYPE;
 846     DWORD dwEffects = CFM_BOLD | CFM_ITALIC | CFM_UNDERLINE | CFM_STRIKEOUT | CFM_PROTECTED | CFM_LINK | CFM_SUPERSCRIPT;
 847
 848     run = ME_FindItemFwd(run, diRun);
 849
 850     ZeroMemory(&tmp, sizeof(tmp));
 851     tmp.cbSize = sizeof(tmp);
 852     ME_GetRunCharFormat(editor, run, &tmp);
 853
 854     assert((tmp.dwMask & dwAttribs) == dwAttribs);
 855     /* reset flags that differ */
 856
 857     if (pFmt->yHeight != tmp.yHeight)
 858       pFmt->dwMask &= ~CFM_SIZE;
 859     if (pFmt->dwMask & CFM_FACE)
 860     {
 861       if (!(tmp.dwMask & CFM_FACE))
 862         pFmt->dwMask &= ~CFM_FACE;
 863       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName) ||
 864           pFmt->bPitchAndFamily != tmp.bPitchAndFamily)
 865         pFmt->dwMask &= ~CFM_FACE;
 866     }
 867     if (pFmt->yHeight != tmp.yHeight)
 868       pFmt->dwMask &= ~CFM_SIZE;
 869     if (pFmt->bUnderlineType != tmp.bUnderlineType)
 870       pFmt->dwMask &= ~CFM_UNDERLINETYPE;
 871     if (pFmt->dwMask & CFM_COLOR)
 872     {
 873       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 874       {
 875         if (pFmt->crTextColor != tmp.crTextColor)
 876           pFmt->dwMask &= ~CFM_COLOR;
 877       }
 878     }
 879
 880     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & dwEffects);
 881     pFmt->dwEffects = tmp.dwEffects;
 882
 883   } while(run != run_end);
 884 }