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  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "editor.h"
  24
  25 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  26
  27 int ME_CanJoinRuns(ME_Run *run1, ME_Run *run2)
  28 {
  29   if ((run1->nFlags | run2->nFlags) & (MERF_ENDPARA | MERF_GRAPHICS))
  30     return 0;
  31   if (run1->style != run2->style)
  32     return 0;
  33   if ((run1->nFlags & MERF_STYLEFLAGS) != (run2->nFlags & MERF_STYLEFLAGS))
  34     return 0;
  35   return 1;
  36 }
  37
  38 void ME_SkipAndPropagateCharOffset(ME_DisplayItem *p, int shift)
  39 {
  40   p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  41   assert(p);
  42   ME_PropagateCharOffset(p, shift);
  43 }
  44
  45 void ME_PropagateCharOffset(ME_DisplayItem *p, int shift)
  46 {
  47   if (p->type == diRun) /* propagate in all runs in this para */
  48   {
  49     TRACE("PropagateCharOffset(%s, %d)\n", debugstr_w(p->member.run.strText->szData), shift);
  50     do {
  51       p->member.run.nCharOfs += shift;
  52       assert(p->member.run.nCharOfs >= 0);
  53       p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  54     } while(p->type == diRun);
  55   }
  56   if (p->type == diParagraph) /* propagate in all next paras */
  57   {
  58     do {
  59       p->member.para.nCharOfs += shift;
  60       assert(p->member.para.nCharOfs >= 0);
  61       p = p->member.para.next_para;
  62     } while(p->type == diParagraph);
  63   }
  64   if (p->type == diTextEnd)
  65   {
  66     p->member.para.nCharOfs += shift;
  67     assert(p->member.para.nCharOfs >= 0);
  68   }
  69 }
  70
  71 void ME_CheckCharOffsets(ME_TextEditor *editor)
  72 {
  73   ME_DisplayItem *p = editor->pBuffer->pFirst;
  74   int ofs = 0, ofsp = 0;
  75   if(TRACE_ON(richedit))
  76   {
  77     TRACE("---\n");
  78     ME_DumpDocument(editor->pBuffer);
  79   }
  80   do {
  81     p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  82     switch(p->type) {
  83       case diTextEnd:
  84         TRACE("tend, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
  85         assert(ofsp+ofs == p->member.para.nCharOfs);
  86         return;
  87       case diParagraph:
  88         TRACE("para, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
  89         assert(ofsp+ofs == p->member.para.nCharOfs);
  90         ofsp = p->member.para.nCharOfs;
  91         ofs = 0;
  92         break;
  93       case diRun:
  94         TRACE("run, real ofs = %d (+ofsp = %d), counted = %d, len = %d, txt = \"%s\", flags=%08x, fx&mask = %08lx\n",
  95           p->member.run.nCharOfs, p->member.run.nCharOfs+ofsp, ofsp+ofs,
  96           p->member.run.strText->nLen, debugstr_w(p->member.run.strText->szData),
  97           p->member.run.nFlags,
  98           p->member.run.style->fmt.dwMask & p->member.run.style->fmt.dwEffects);
  99         assert(ofs == p->member.run.nCharOfs);
 100         ofs += ME_StrLen(p->member.run.strText);
 101         break;
 102       default:
 103         assert(0);
 104     }
 105   } while(1);
 106 }
 107
 108 int ME_CharOfsFromRunOfs(ME_TextEditor *editor, ME_DisplayItem *pRun, int nOfs)
 109 {
 110   ME_DisplayItem *pPara;
 111
 112   assert(pRun->type == diRun);
 113   assert(pRun->member.run.nCharOfs != -1);
 114
 115   pPara = ME_FindItemBack(pRun, diParagraph);
 116   assert(pPara);
 117   assert(pPara->type==diParagraph);
 118   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs
 119     + ME_VPosToPos(pRun->member.run.strText, nOfs);
 120 }
 121
 122 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 123 {
 124   ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pRun, &pCursor->nOffset);
 125 }
 126
 127 void ME_RunOfsFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem **ppRun, int *pOfs)
 128 {
 129   ME_DisplayItem *pPara;
 130   int nParaOfs;
 131
 132   pPara = editor->pBuffer->pFirst->member.para.next_para;
 133   assert(pPara);
 134   assert(ppRun);
 135   assert(pOfs);
 136   while (pPara->type == diParagraph)
 137   {
 138     nParaOfs = pPara->member.para.nCharOfs;
 139     assert(nCharOfs >= nParaOfs);
 140
 141     if (nCharOfs < pPara->member.para.next_para->member.para.nCharOfs)
 142     {
 143       *ppRun = ME_FindItemFwd(pPara, diRun);
 144       assert(*ppRun);
 145       while (!((*ppRun)->member.run.nFlags & MERF_ENDPARA))
 146       {
 147         ME_DisplayItem *pNext = ME_FindItemFwd(*ppRun, diRun);
 148         assert(pNext);
 149         assert(pNext->type == diRun);
 150         if (nCharOfs < nParaOfs + pNext->member.run.nCharOfs) {
 151           *pOfs = ME_PosToVPos((*ppRun)->member.run.strText,
 152             nCharOfs - nParaOfs - (*ppRun)->member.run.nCharOfs);
 153           return;
 154         }
 155         *ppRun = pNext;
 156       }
 157       if (nCharOfs == nParaOfs + (*ppRun)->member.run.nCharOfs) {
 158         *pOfs = 0;
 159         return;
 160       }
 161     }
 162     pPara = pPara->member.para.next_para;
 163   }
 164   *ppRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 165   *pOfs = 0;
 166   assert((*ppRun)->member.run.nFlags & MERF_ENDPARA);
 167 }
 168
 169 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 170 {
 171   ME_DisplayItem *pNext = p->next;
 172   int i;
 173   assert(p->type == diRun && pNext->type == diRun);
 174   assert(p->member.run.nCharOfs != -1);
 175   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 176
 177   if (editor->bCaretAtEnd && editor->pCursors[0].pRun == pNext)
 178     editor->bCaretAtEnd = FALSE;
 179   for (i=0; i<editor->nCursors; i++) {
 180     if (editor->pCursors[i].pRun == pNext) {
 181       editor->pCursors[i].pRun = p;
 182       editor->pCursors[i].nOffset += ME_StrVLen(p->member.run.strText);
 183     }
 184   }
 185
 186   ME_AppendString(p->member.run.strText, pNext->member.run.strText);
 187   ME_Remove(pNext);
 188   ME_DestroyDisplayItem(pNext);
 189   ME_UpdateRunFlags(editor, &p->member.run);
 190   if(TRACE_ON(richedit))
 191   {
 192     TRACE("Before check after join\n");
 193     ME_CheckCharOffsets(editor);
 194     TRACE("After check after join\n");
 195   }
 196 }
 197
 198 ME_DisplayItem *ME_SplitRun(ME_Context *c, ME_DisplayItem *item, int nVChar)
 199 {
 200   ME_TextEditor *editor = c->editor;
 201   ME_DisplayItem *item2 = NULL;
 202   ME_Run *run, *run2;
 203
 204   assert(item->member.run.nCharOfs != -1);
 205   if(TRACE_ON(richedit))
 206   {
 207     TRACE("Before check before split\n");
 208     ME_CheckCharOffsets(editor);
 209     TRACE("After check before split\n");
 210   }
 211
 212   run = &item->member.run;
 213
 214   TRACE("Before split: %s(%ld, %ld)\n", debugstr_w(run->strText->szData),
 215         run->pt.x, run->pt.y);
 216
 217   item2 = ME_SplitRunSimple(editor, item, nVChar);
 218
 219   run2 = &item2->member.run;
 220
 221   ME_CalcRunExtent(c, run);
 222   ME_CalcRunExtent(c, run2);
 223
 224   run2->pt.x = run->pt.x+run->nWidth;
 225   run2->pt.y = run->pt.y;
 226
 227   if(TRACE_ON(richedit))
 228   {
 229     TRACE("Before check after split\n");
 230     ME_CheckCharOffsets(editor);
 231     TRACE("After check after split\n");
 232     TRACE("After split: %s(%ld, %ld), %s(%ld, %ld)\n",
 233       debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
 234       debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
 235   }
 236
 237   return item2;
 238 }
 239
 240 /* split a run starting from voffset */
 241 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_DisplayItem *item, int nVChar)
 242 {
 243   ME_Run *run = &item->member.run;
 244   ME_DisplayItem *item2;
 245   ME_Run *run2;
 246   int i;
 247   assert(nVChar > 0 && nVChar < ME_StrVLen(run->strText));
 248   assert(item->type == diRun);
 249   assert(!(item->member.run.nFlags & MERF_GRAPHICS));
 250   assert(item->member.run.nCharOfs != -1);
 251
 252   item2 = ME_MakeRun(run->style,
 253       ME_VSplitString(run->strText, nVChar), run->nFlags&MERF_SPLITMASK);
 254
 255   item2->member.run.nCharOfs = item->member.run.nCharOfs+
 256     ME_VPosToPos(item->member.run.strText, nVChar);
 257
 258   run2 = &item2->member.run;
 259   ME_InsertBefore(item->next, item2);
 260
 261   ME_UpdateRunFlags(editor, run);
 262   ME_UpdateRunFlags(editor, run2);
 263   for (i=0; i<editor->nCursors; i++) {
 264     if (editor->pCursors[i].pRun == item &&
 265         editor->pCursors[i].nOffset >= nVChar) {
 266       assert(item2->type == diRun);
 267       editor->pCursors[i].pRun = item2;
 268       editor->pCursors[i].nOffset -= nVChar;
 269     }
 270   }
 271   ME_GetParagraph(item)->member.para.nFlags |= MEPF_REWRAP;
 272   return item2;
 273 }
 274
 275 /* split the start and final whitespace into separate runs */
 276 /* returns the last run added */
 277 /*
 278 ME_DisplayItem *ME_SplitFurther(ME_TextEditor *editor, ME_DisplayItem *item)
 279 {
 280   int i, nVLen, nChanged;
 281   assert(item->type == diRun);
 282   assert(!(item->member.run.nFlags & MERF_GRAPHICS));
 283   return item;
 284 }
 285 */
 286
 287 ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
 288 {
 289   ME_DisplayItem *item = ME_MakeDI(diRun);
 290   item->member.run.style = s;
 291   item->member.run.strText = strData;
 292   item->member.run.nFlags = nFlags;
 293   item->member.run.nCharOfs = -1;
 294   ME_AddRefStyle(s);
 295   return item;
 296 }
 297
 298 ME_DisplayItem *ME_InsertRun(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem *pItem)
 299 {
 300   ME_Cursor tmp;
 301   ME_DisplayItem *pDI;
 302   ME_UndoItem *pUI;
 303
 304   assert(pItem->type == diRun || pItem->type == diUndoInsertRun);
 305
 306   pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
 307   if (pUI) {
 308     pUI->nStart = nCharOfs;
 309     pUI->nLen = pItem->member.run.strText->nLen;
 310   }
 311   ME_CursorFromCharOfs(editor, nCharOfs, &tmp);
 312   if (tmp.nOffset) {
 313     tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
 314     tmp.nOffset = 0;
 315   }
 316   pDI = ME_MakeRun(pItem->member.run.style, ME_StrDup(pItem->member.run.strText), pItem->member.run.nFlags);
 317   pDI->member.run.nCharOfs = tmp.pRun->member.run.nCharOfs;
 318   ME_InsertBefore(tmp.pRun, pDI);
 319   TRACE("Shift length:%d\n", pDI->member.run.strText->nLen);
 320   ME_PropagateCharOffset(tmp.pRun, pDI->member.run.strText->nLen);
 321   ME_GetParagraph(tmp.pRun)->member.para.nFlags |= MEPF_REWRAP;
 322
 323   return pDI;
 324 }
 325
 326 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 327 {
 328   assert(run->nCharOfs != -1);
 329   if (ME_IsSplitable(run->strText))
 330     run->nFlags |= MERF_SPLITTABLE;
 331   else
 332     run->nFlags &= ~MERF_SPLITTABLE;
 333
 334   if (!(run->nFlags & MERF_GRAPHICS)) {
 335     if (ME_IsWhitespaces(run->strText))
 336       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 337     else
 338     {
 339       run->nFlags &= ~MERF_WHITESPACE;
 340
 341       if (ME_IsWSpace(ME_GetCharFwd(run->strText,0)))
 342         run->nFlags |= MERF_STARTWHITE;
 343       else
 344         run->nFlags &= ~MERF_STARTWHITE;
 345
 346       if (ME_IsWSpace(ME_GetCharBack(run->strText,0)))
 347         run->nFlags |= MERF_ENDWHITE;
 348       else
 349         run->nFlags &= ~MERF_ENDWHITE;
 350     }
 351   }
 352   else
 353     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 354 }
 355
 356 void ME_GetGraphicsSize(ME_TextEditor *editor, ME_Run *run, SIZE *pSize)
 357 {
 358   assert(run->nFlags & MERF_GRAPHICS);
 359   pSize->cx = 64;
 360   pSize->cy = 64;
 361 }
 362
 363 int ME_CharFromPoint(ME_TextEditor *editor, int cx, ME_Run *run)
 364 {
 365   int fit = 0;
 366   HGDIOBJ hOldFont;
 367   HDC hDC;
 368   SIZE sz;
 369   if (!run->strText->nLen)
 370     return 0;
 371
 372   if (run->nFlags & MERF_GRAPHICS)
 373   {
 374     SIZE sz;
 375     ME_GetGraphicsSize(editor, run, &sz);
 376     if (cx < sz.cx)
 377       return 0;
 378     return 1;
 379   }
 380   hDC = GetDC(editor->hWnd);
 381   hOldFont = ME_SelectStyleFont(editor, hDC, run->style);
 382   GetTextExtentExPointW(hDC, run->strText->szData, run->strText->nLen,
 383     cx, &fit, NULL, &sz);
 384   ME_UnselectStyleFont(editor, hDC, run->style, hOldFont);
 385   ReleaseDC(editor->hWnd, hDC);
 386   return fit;
 387 }
 388
 389 int ME_CharFromPointCursor(ME_TextEditor *editor, int cx, ME_Run *run)
 390 {
 391   int fit = 0, fit1 = 0;
 392   HGDIOBJ hOldFont;
 393   HDC hDC;
 394   SIZE sz, sz2, sz3;
 395   if (!run->strText->nLen)
 396     return 0;
 397
 398   if (run->nFlags & MERF_GRAPHICS)
 399   {
 400     SIZE sz;
 401     ME_GetGraphicsSize(editor, run, &sz);
 402     if (cx < sz.cx/2)
 403       return 0;
 404     return 1;
 405   }
 406
 407   hDC = GetDC(editor->hWnd);
 408   hOldFont = ME_SelectStyleFont(editor, hDC, run->style);
 409   GetTextExtentExPointW(hDC, run->strText->szData, run->strText->nLen,
 410     cx, &fit, NULL, &sz);
 411   if (fit != run->strText->nLen)
 412   {
 413     int chars = 1;
 414
 415     GetTextExtentPoint32W(hDC, run->strText->szData, fit, &sz2);
 416     fit1 = ME_StrRelPos(run->strText, fit, &chars);
 417     GetTextExtentPoint32W(hDC, run->strText->szData, fit1, &sz3);
 418     if (cx >= (sz2.cx+sz3.cx)/2)
 419       fit = fit1;
 420   }
 421   ME_UnselectStyleFont(editor, hDC, run->style, hOldFont);
 422   ReleaseDC(editor->hWnd, hDC);
 423   return fit;
 424 }
 425
 426 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset)
 427 {
 428   SIZE size;
 429   HDC hDC = GetDC(editor->hWnd);
 430   HGDIOBJ hOldFont;
 431
 432   if (pRun->nFlags & MERF_GRAPHICS)
 433   {
 434     if (!nOffset) return 0;
 435     ME_GetGraphicsSize(editor, pRun, &size);
 436     return 1;
 437   }
 438   hOldFont = ME_SelectStyleFont(editor, hDC, pRun->style);
 439   GetTextExtentPoint32W(hDC, pRun->strText->szData, nOffset, &size);
 440   ME_UnselectStyleFont(editor, hDC, pRun->style, hOldFont);
 441   ReleaseDC(editor->hWnd, hDC);
 442   return size.cx;
 443 }
 444
 445 void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s,
 446   SIZE *size)
 447 {
 448   HDC hDC = c->hDC;
 449   HGDIOBJ hOldFont;
 450   hOldFont = ME_SelectStyleFont(c->editor, hDC, s);
 451   GetTextExtentPoint32W(hDC, szText, nChars, size);
 452   ME_UnselectStyleFont(c->editor, hDC, s, hOldFont);
 453 }
 454
 455 SIZE ME_GetRunSize(ME_Context *c, ME_Run *run, int nLen)
 456 {
 457   SIZE size;
 458   int nMaxLen = ME_StrVLen(run->strText);
 459
 460   if (nLen>nMaxLen)
 461     nLen = nMaxLen;
 462
 463   if (run->nFlags & MERF_GRAPHICS)
 464   {
 465     ME_GetGraphicsSize(c->editor, run, &size);
 466     return size;
 467   }
 468
 469   ME_GetTextExtent(c, run->strText->szData, nLen, run->style, &size);
 470
 471   return size;
 472 }
 473
 474 void ME_CalcRunExtent(ME_Context *c, ME_Run *run)
 475 {
 476   SIZE size;
 477   int nEnd = ME_StrVLen(run->strText);
 478
 479   if (run->nFlags & MERF_GRAPHICS) {
 480     ME_GetGraphicsSize(c->editor, run, &size);
 481     run->nWidth = size.cx;
 482     run->nAscent = size.cy;
 483     run->nDescent = 0;
 484     return;
 485   }
 486   ME_GetTextExtent(c, run->strText->szData, nEnd, run->style, &size);
 487   run->nWidth = size.cx;
 488   run->nAscent = run->style->tm.tmAscent;
 489   run->nDescent = run->style->tm.tmDescent;
 490 }
 491
 492 void ME_MustBeWrapped(ME_Context *c, ME_DisplayItem *para)
 493 {
 494   assert(para->type == diParagraph);
 495   /* FIXME */
 496 }
 497
 498 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 499 {
 500   int nFrom, nTo;
 501   ME_GetSelection(editor, &nFrom, &nTo);
 502   if (nFrom == nTo)
 503   {
 504     ME_Style *s;
 505     if (!editor->pBuffer->pCharStyle)
 506       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 507     s = ME_ApplyStyle(editor->pBuffer->pCharStyle, pFmt);
 508     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 509     editor->pBuffer->pCharStyle = s;
 510   }
 511   else
 512     ME_SetCharFormat(editor, nFrom, nTo-nFrom, pFmt);
 513 }
 514
 515 void ME_SetCharFormat(ME_TextEditor *editor, int nOfs, int nChars, CHARFORMAT2W *pFmt)
 516 {
 517   ME_Cursor tmp, tmp2;
 518   ME_DisplayItem *para;
 519
 520   ME_CursorFromCharOfs(editor, nOfs, &tmp);
 521   if (tmp.nOffset)
 522     tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
 523
 524   ME_CursorFromCharOfs(editor, nOfs+nChars, &tmp2);
 525   if (tmp2.nOffset)
 526     tmp2.pRun = ME_SplitRunSimple(editor, tmp2.pRun, tmp2.nOffset);
 527
 528   para = ME_GetParagraph(tmp.pRun);
 529   para->member.para.nFlags |= MEPF_REWRAP;
 530
 531   while(tmp.pRun != tmp2.pRun)
 532   {
 533     ME_UndoItem *undo = NULL;
 534     ME_Style *new_style = ME_ApplyStyle(tmp.pRun->member.run.style, pFmt);
 535     /* ME_DumpStyle(new_style); */
 536     undo = ME_AddUndoItem(editor, diUndoSetCharFormat, NULL);
 537     if (undo) {
 538       undo->nStart = tmp.pRun->member.run.nCharOfs+para->member.para.nCharOfs;
 539       undo->nLen = tmp.pRun->member.run.strText->nLen;
 540       undo->di.member.ustyle = tmp.pRun->member.run.style;
 541       /* we'd have to addref undo..ustyle and release tmp...style
 542          but they'd cancel each other out so we can do nothing instead */
 543     }
 544     else
 545       ME_ReleaseStyle(tmp.pRun->member.run.style);
 546     tmp.pRun->member.run.style = new_style;
 547     tmp.pRun = ME_FindItemFwd(tmp.pRun, diRunOrParagraph);
 548     if (tmp.pRun->type == diParagraph)
 549     {
 550       para = tmp.pRun;
 551       tmp.pRun = ME_FindItemFwd(tmp.pRun, diRun);
 552       if (tmp.pRun != tmp2.pRun)
 553         para->member.para.nFlags |= MEPF_REWRAP;
 554     }
 555     assert(tmp.pRun);
 556   }
 557 }
 558
 559 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 560 {
 561   ME_Style *style;
 562   ME_UndoItem *undo;
 563
 564   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 565   undo = ME_AddUndoItem(editor, diUndoSetDefaultCharFormat, NULL);
 566   if (undo) {
 567     undo->nStart = -1;
 568     undo->nLen = -1;
 569     undo->di.member.ustyle = editor->pBuffer->pDefaultStyle;
 570     ME_AddRefStyle(undo->di.member.ustyle);
 571   }
 572   style = ME_ApplyStyle(editor->pBuffer->pDefaultStyle, mod);
 573   editor->pBuffer->pDefaultStyle->fmt = style->fmt;
 574   editor->pBuffer->pDefaultStyle->tm = style->tm;
 575   ME_ReleaseStyle(style);
 576   ME_MarkAllForWrapping(editor);
 577   /*  pcf = editor->pBuffer->pDefaultStyle->fmt; */
 578 }
 579
 580 void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 581 {
 582   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 583 }
 584
 585 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 586 {
 587   int nFrom, nTo;
 588   ME_GetSelection(editor, &nFrom, &nTo);
 589   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 590 }
 591
 592 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 593 {
 594   int nFrom, nTo;
 595   ME_GetSelection(editor, &nFrom, &nTo);
 596   if (nFrom == nTo && editor->pBuffer->pCharStyle)
 597   {
 598     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 599     return;
 600   }
 601   ME_GetCharFormat(editor, nFrom, nTo, pFmt);
 602 }
 603
 604 void ME_GetCharFormat(ME_TextEditor *editor, int nFrom, int nTo, CHARFORMAT2W *pFmt)
 605 {
 606   ME_DisplayItem *run, *run_end;
 607   int nOffset, nOffset2;
 608   CHARFORMAT2W tmp;
 609
 610   if (nTo>nFrom) /* selection consists of chars from nFrom up to nTo-1 */
 611     nTo--;
 612
 613   ME_RunOfsFromCharOfs(editor, nFrom, &run, &nOffset);
 614   if (nFrom == nTo) /* special case - if selection is empty, take previous char's formatting */
 615   {
 616     if (!nOffset)
 617     {
 618       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 619       if (tmp_run->type == diRun) {
 620         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 621         return;
 622       }
 623     }
 624     ME_GetRunCharFormat(editor, run, pFmt);
 625     return;
 626   }
 627   ME_RunOfsFromCharOfs(editor, nTo, &run_end, &nOffset2);
 628
 629   ME_GetRunCharFormat(editor, run, pFmt);
 630
 631   if (run == run_end) return;
 632
 633   do {
 634     /* FIXME add more style feature comparisons */
 635     int nAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR;
 636     int nEffects = CFM_BOLD | CFM_ITALIC | CFM_UNDERLINE;
 637
 638     run = ME_FindItemFwd(run, diRun);
 639
 640     ZeroMemory(&tmp, sizeof(tmp));
 641     tmp.cbSize = sizeof(tmp);
 642     ME_GetRunCharFormat(editor, run, &tmp);
 643
 644     assert((tmp.dwMask & nAttribs) == nAttribs);
 645     assert((tmp.dwMask & nEffects) == nEffects);
 646     /* reset flags that differ */
 647
 648     if (pFmt->yHeight != tmp.yHeight)
 649       pFmt->dwMask &= ~CFM_SIZE;
 650     if (pFmt->dwMask & CFM_FACE)
 651     {
 652       if (!(tmp.dwMask & CFM_FACE))
 653         pFmt->dwMask &= ~CFM_FACE;
 654       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName))
 655         pFmt->dwMask &= ~CFM_FACE;
 656     }
 657     if (pFmt->yHeight != tmp.yHeight)
 658       pFmt->dwMask &= ~CFM_SIZE;
 659     if (pFmt->dwMask & CFM_COLOR)
 660     {
 661       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 662       {
 663         if (pFmt->crTextColor != tmp.crTextColor)
 664           pFmt->dwMask &= ~CFM_COLOR;
 665       }
 666     }
 667
 668     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & nEffects);
 669
 670   } while(run != run_end);
 671 }