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 1 if two runs can be safely merged into one, 0 otherwise.
  34  */
  35 int ME_CanJoinRuns(const ME_Run *run1, const ME_Run *run2)
  36 {
  37   if ((run1->nFlags | run2->nFlags) & MERF_NOJOIN)
  38     return 0;
  39   if (run1->style != run2->style)
  40     return 0;
  41   if ((run1->nFlags & MERF_STYLEFLAGS) != (run2->nFlags & MERF_STYLEFLAGS))
  42     return 0;
  43   return 1;
  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_w(p->member.run.strText->szData), 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   if(TRACE_ON(richedit_lists))
 106   {
 107     TRACE_(richedit_lists)("---\n");
 108     ME_DumpDocument(editor->pBuffer);
 109   }
 110   do {
 111     p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
 112     switch(p->type) {
 113       case diTextEnd:
 114         TRACE_(richedit_check)("tend, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
 115         assert(ofsp+ofs == p->member.para.nCharOfs);
 116         return;
 117       case diParagraph:
 118         TRACE_(richedit_check)("para, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
 119         assert(ofsp+ofs == p->member.para.nCharOfs);
 120         ofsp = p->member.para.nCharOfs;
 121         ofs = 0;
 122         break;
 123       case diRun:
 124         TRACE_(richedit_check)("run, real ofs = %d (+ofsp = %d), counted = %d, len = %d, txt = \"%s\", flags=%08x, fx&mask = %08x\n",
 125           p->member.run.nCharOfs, p->member.run.nCharOfs+ofsp, ofsp+ofs,
 126           p->member.run.strText->nLen, debugstr_w(p->member.run.strText->szData),
 127           p->member.run.nFlags,
 128           p->member.run.style->fmt.dwMask & p->member.run.style->fmt.dwEffects);
 129         assert(ofs == p->member.run.nCharOfs);
 130         assert(p->member.run.strText->nLen);
 131         ofs += p->member.run.strText->nLen;
 132         break;
 133       case diCell:
 134         TRACE_(richedit_check)("cell\n");
 135         break;
 136       default:
 137         assert(0);
 138     }
 139   } while(1);
 140 }
 141
 142 /******************************************************************************
 143  * ME_CharOfsFromRunOfs
 144  *
 145  * Converts a character position relative to the start of the run, to a
 146  * character position relative to the start of the document.
 147  * Kind of a "local to global" offset conversion.
 148  */
 149 int ME_CharOfsFromRunOfs(ME_TextEditor *editor, const ME_DisplayItem *pPara,
 150                          const ME_DisplayItem *pRun, int nOfs)
 151 {
 152   assert(pRun && pRun->type == diRun);
 153   assert(pPara && pPara->type == diParagraph);
 154   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs + nOfs;
 155 }
 156
 157 /******************************************************************************
 158  * ME_CursorFromCharOfs
 159  *
 160  * Converts a character offset (relative to the start of the document) to
 161  * a cursor structure (which contains a run and a position relative to that
 162  * run).
 163  */
 164 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 165 {
 166   ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pPara,
 167                        &pCursor->pRun, &pCursor->nOffset);
 168 }
 169
 170 /******************************************************************************
 171  * ME_RunOfsFromCharOfs
 172  *
 173  * Find a run and relative character offset given an absolute character offset
 174  * (absolute offset being an offset relative to the start of the document).
 175  * Kind of a "global to local" offset conversion.
 176  */
 177 void ME_RunOfsFromCharOfs(ME_TextEditor *editor,
 178                           int nCharOfs,
 179                           ME_DisplayItem **ppPara,
 180                           ME_DisplayItem **ppRun,
 181                           int *pOfs)
 182 {
 183   ME_DisplayItem *item, *next_item;
 184
 185   nCharOfs = max(nCharOfs, 0);
 186   nCharOfs = min(nCharOfs, ME_GetTextLength(editor));
 187
 188   /* Find the paragraph at the offset. */
 189   next_item = editor->pBuffer->pFirst->member.para.next_para;
 190   do {
 191     item = next_item;
 192     next_item = item->member.para.next_para;
 193   } while (next_item->member.para.nCharOfs <= nCharOfs);
 194   assert(item->type == diParagraph);
 195   nCharOfs -= item->member.para.nCharOfs;
 196   if (ppPara) *ppPara = item;
 197
 198   /* Find the run at the offset. */
 199   next_item = ME_FindItemFwd(item, diRun);
 200   do {
 201     item = next_item;
 202     next_item = ME_FindItemFwd(item, diRunOrParagraphOrEnd);
 203   } while (next_item->type == diRun &&
 204            next_item->member.run.nCharOfs <= nCharOfs);
 205   assert(item->type == diRun);
 206   nCharOfs -= item->member.run.nCharOfs;
 207
 208   if (ppRun) *ppRun = item;
 209   if (pOfs) *pOfs = nCharOfs;
 210 }
 211
 212 /******************************************************************************
 213  * ME_JoinRuns
 214  *
 215  * Merges two adjacent runs, the one given as a parameter and the next one.
 216  */
 217 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 218 {
 219   ME_DisplayItem *pNext = p->next;
 220   int i;
 221   assert(p->type == diRun && pNext->type == diRun);
 222   assert(p->member.run.nCharOfs != -1);
 223   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 224
 225   /* Update all cursors so that they don't contain the soon deleted run */
 226   for (i=0; i<editor->nCursors; i++) {
 227     if (editor->pCursors[i].pRun == pNext) {
 228       editor->pCursors[i].pRun = p;
 229       editor->pCursors[i].nOffset += p->member.run.strText->nLen;
 230     }
 231   }
 232
 233   ME_AppendString(p->member.run.strText, pNext->member.run.strText);
 234   ME_Remove(pNext);
 235   ME_DestroyDisplayItem(pNext);
 236   ME_UpdateRunFlags(editor, &p->member.run);
 237   if(TRACE_ON(richedit))
 238   {
 239     TRACE("Before check after join\n");
 240     ME_CheckCharOffsets(editor);
 241     TRACE("After check after join\n");
 242   }
 243 }
 244
 245 /******************************************************************************
 246  * ME_SplitRun
 247  *
 248  * Splits a run into two in a given place. It also updates the screen position
 249  * and size (extent) of the newly generated runs.
 250  */
 251 ME_DisplayItem *ME_SplitRun(ME_WrapContext *wc, ME_DisplayItem *item, int nVChar)
 252 {
 253   ME_TextEditor *editor = wc->context->editor;
 254   ME_Run *run, *run2;
 255   ME_Paragraph *para = &wc->pPara->member.para;
 256   ME_Cursor cursor = {wc->pPara, item, nVChar};
 257
 258   assert(item->member.run.nCharOfs != -1);
 259   if(TRACE_ON(richedit))
 260   {
 261     TRACE("Before check before split\n");
 262     ME_CheckCharOffsets(editor);
 263     TRACE("After check before split\n");
 264   }
 265
 266   run = &item->member.run;
 267
 268   TRACE("Before split: %s(%d, %d)\n", debugstr_w(run->strText->szData),
 269         run->pt.x, run->pt.y);
 270
 271   ME_SplitRunSimple(editor, &cursor);
 272
 273   run2 = &cursor.pRun->member.run;
 274
 275   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
 276
 277   run2->pt.x = run->pt.x+run->nWidth;
 278   run2->pt.y = run->pt.y;
 279
 280   if(TRACE_ON(richedit))
 281   {
 282     TRACE("Before check after split\n");
 283     ME_CheckCharOffsets(editor);
 284     TRACE("After check after split\n");
 285     TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
 286       debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
 287       debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
 288   }
 289
 290   return cursor.pRun;
 291 }
 292
 293 /******************************************************************************
 294  * ME_SplitRunSimple
 295  *
 296  * Does the most basic job of splitting a run into two - it does not
 297  * update the positions and extents.
 298  */
 299 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_Cursor *cursor)
 300 {
 301   ME_DisplayItem *run = cursor->pRun;
 302   ME_DisplayItem *new_run;
 303   int i;
 304   int nOffset = cursor->nOffset;
 305
 306   assert(!(run->member.run.nFlags & MERF_NONTEXT));
 307
 308   new_run = ME_MakeRun(run->member.run.style,
 309                        ME_VSplitString(run->member.run.strText, nOffset),
 310                        run->member.run.nFlags & MERF_SPLITMASK);
 311
 312   new_run->member.run.nCharOfs = run->member.run.nCharOfs + nOffset;
 313   cursor->pRun = new_run;
 314   cursor->nOffset = 0;
 315
 316   ME_InsertBefore(run->next, new_run);
 317
 318   ME_UpdateRunFlags(editor, &run->member.run);
 319   ME_UpdateRunFlags(editor, &new_run->member.run);
 320   for (i = 0; i < editor->nCursors; i++) {
 321     if (editor->pCursors[i].pRun == run &&
 322         editor->pCursors[i].nOffset >= nOffset) {
 323       editor->pCursors[i].pRun = new_run;
 324       editor->pCursors[i].nOffset -= nOffset;
 325     }
 326   }
 327   cursor->pPara->member.para.nFlags |= MEPF_REWRAP;
 328   return run;
 329 }
 330
 331 /******************************************************************************
 332  * ME_MakeRun
 333  *
 334  * A helper function to create run structures quickly.
 335  */
 336 ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
 337 {
 338   ME_DisplayItem *item = ME_MakeDI(diRun);
 339   item->member.run.style = s;
 340   item->member.run.ole_obj = NULL;
 341   item->member.run.strText = strData;
 342   item->member.run.nFlags = nFlags;
 343   item->member.run.nCharOfs = -1;
 344   ME_AddRefStyle(s);
 345   return item;
 346 }
 347
 348 /******************************************************************************
 349  * ME_InsertRunAtCursor
 350  *
 351  * Inserts a new run with given style, flags and content at a given position,
 352  * which is passed as a cursor structure (which consists of a run and
 353  * a run-relative character offset).
 354  */
 355 ME_DisplayItem *
 356 ME_InsertRunAtCursor(ME_TextEditor *editor, ME_Cursor *cursor, ME_Style *style,
 357                      const WCHAR *str, int len, int flags)
 358 {
 359   ME_DisplayItem *pDI;
 360   ME_UndoItem *pUI;
 361
 362   if (cursor->nOffset)
 363     ME_SplitRunSimple(editor, cursor);
 364
 365   pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
 366   if (pUI) {
 367     pUI->nStart = cursor->pPara->member.para.nCharOfs
 368                   + cursor->pRun->member.run.nCharOfs;
 369     pUI->nLen = len;
 370   }
 371
 372   pDI = ME_MakeRun(style, ME_MakeStringN(str, len), flags);
 373   pDI->member.run.nCharOfs = cursor->pRun->member.run.nCharOfs;
 374   ME_InsertBefore(cursor->pRun, pDI);
 375   TRACE("Shift length:%d\n", len);
 376   ME_PropagateCharOffset(cursor->pRun, len);
 377   cursor->pPara->member.para.nFlags |= MEPF_REWRAP;
 378   return pDI;
 379 }
 380
 381 /******************************************************************************
 382  * ME_UpdateRunFlags
 383  *
 384  * Determine some of run attributes given its content (style, text content).
 385  * Some flags cannot be determined by this function (MERF_GRAPHICS,
 386  * MERF_ENDPARA)
 387  */
 388 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 389 {
 390   ME_String *strText = run->strText;
 391   assert(run->nCharOfs >= 0);
 392
 393   if (RUN_IS_HIDDEN(run) || run->nFlags & MERF_TABLESTART)
 394     run->nFlags |= MERF_HIDDEN;
 395   else
 396     run->nFlags &= ~MERF_HIDDEN;
 397
 398   if (ME_IsSplitable(strText))
 399     run->nFlags |= MERF_SPLITTABLE;
 400   else
 401     run->nFlags &= ~MERF_SPLITTABLE;
 402
 403   if (!(run->nFlags & MERF_NOTEXT)) {
 404     if (ME_IsWhitespaces(strText))
 405       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 406     else
 407     {
 408       run->nFlags &= ~MERF_WHITESPACE;
 409
 410       if (ME_IsWSpace(strText->szData[0]))
 411         run->nFlags |= MERF_STARTWHITE;
 412       else
 413         run->nFlags &= ~MERF_STARTWHITE;
 414
 415       if (ME_IsWSpace(strText->szData[strText->nLen - 1]))
 416         run->nFlags |= MERF_ENDWHITE;
 417       else
 418         run->nFlags &= ~MERF_ENDWHITE;
 419     }
 420   }
 421   else
 422     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 423 }
 424
 425 /******************************************************************************
 426  * ME_CharFromPoint
 427  *
 428  * Returns a character position inside the run given a run-relative
 429  * pixel horizontal position. This version rounds left (ie. if the second
 430  * character is at pixel position 8, then for cx=0..7 it returns 0).
 431  */
 432 int ME_CharFromPoint(ME_Context *c, int cx, ME_Run *run)
 433 {
 434   int fit = 0;
 435   HGDIOBJ hOldFont;
 436   SIZE sz;
 437   if (!run->strText->nLen)
 438     return 0;
 439
 440   if (run->nFlags & MERF_TAB ||
 441       (run->nFlags & (MERF_ENDCELL|MERF_ENDPARA)) == MERF_ENDCELL)
 442   {
 443     if (cx < run->nWidth/2)
 444       return 0;
 445     return 1;
 446   }
 447   if (run->nFlags & MERF_GRAPHICS)
 448   {
 449     SIZE sz;
 450     ME_GetOLEObjectSize(c, run, &sz);
 451     if (cx < sz.cx)
 452       return 0;
 453     return 1;
 454   }
 455   hOldFont = ME_SelectStyleFont(c, run->style);
 456
 457   if (c->editor->cPasswordMask)
 458   {
 459     ME_String *strMasked = ME_MakeStringR(c->editor->cPasswordMask, run->strText->nLen);
 460     GetTextExtentExPointW(c->hDC, strMasked->szData, run->strText->nLen,
 461       cx, &fit, NULL, &sz);
 462     ME_DestroyString(strMasked);
 463   }
 464   else
 465   {
 466     GetTextExtentExPointW(c->hDC, run->strText->szData, run->strText->nLen,
 467       cx, &fit, NULL, &sz);
 468   }
 469
 470   ME_UnselectStyleFont(c, run->style, hOldFont);
 471
 472   return fit;
 473 }
 474
 475 /******************************************************************************
 476  * ME_CharFromPointCursor
 477  *
 478  * Returns a character position inside the run given a run-relative
 479  * pixel horizontal position. This version rounds to the nearest character edge
 480  * (ie. if the second character is at pixel position 8, then for cx=0..3
 481  * it returns 0, and for cx=4..7 it returns 1).
 482  *
 483  * It is used for mouse click handling, for better usability (and compatibility
 484  * with the native control).
 485  */
 486 int ME_CharFromPointCursor(ME_TextEditor *editor, int cx, ME_Run *run)
 487 {
 488   ME_String *strRunText;
 489   /* This could point to either the run's real text, or it's masked form in a password control */
 490
 491   int fit = 0;
 492   ME_Context c;
 493   HGDIOBJ hOldFont;
 494   SIZE sz, sz2, sz3;
 495   if (!run->strText->nLen)
 496     return 0;
 497
 498   if (run->nFlags & (MERF_TAB | MERF_ENDCELL))
 499   {
 500     if (cx < run->nWidth/2)
 501       return 0;
 502     return 1;
 503   }
 504   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 505   if (run->nFlags & MERF_GRAPHICS)
 506   {
 507     SIZE sz;
 508     ME_GetOLEObjectSize(&c, run, &sz);
 509     ME_DestroyContext(&c);
 510     if (cx < sz.cx/2)
 511       return 0;
 512     return 1;
 513   }
 514
 515   if (editor->cPasswordMask)
 516     strRunText = ME_MakeStringR(editor->cPasswordMask, run->strText->nLen);
 517   else
 518     strRunText = run->strText;
 519
 520   hOldFont = ME_SelectStyleFont(&c, run->style);
 521   GetTextExtentExPointW(c.hDC, strRunText->szData, strRunText->nLen,
 522                         cx, &fit, NULL, &sz);
 523   if (fit != strRunText->nLen)
 524   {
 525     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit, &sz2);
 526     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit + 1, &sz3);
 527     if (cx >= (sz2.cx+sz3.cx)/2)
 528       fit = fit + 1;
 529   }
 530
 531   if (editor->cPasswordMask)
 532     ME_DestroyString(strRunText);
 533
 534   ME_UnselectStyleFont(&c, run->style, hOldFont);
 535   ME_DestroyContext(&c);
 536   return fit;
 537 }
 538
 539 /******************************************************************************
 540  * ME_GetTextExtent
 541  *
 542  * Finds a width and a height of the text using a specified style
 543  */
 544 static void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s, SIZE *size)
 545 {
 546   HGDIOBJ hOldFont;
 547   if (c->hDC) {
 548     hOldFont = ME_SelectStyleFont(c, s);
 549     GetTextExtentPoint32W(c->hDC, szText, nChars, size);
 550     ME_UnselectStyleFont(c, s, hOldFont);
 551   } else {
 552     size->cx = 0;
 553     size->cy = 0;
 554   }
 555 }
 556
 557 /******************************************************************************
 558  * ME_PointFromChar
 559  *
 560  * Returns a run-relative pixel position given a run-relative character
 561  * position (character offset)
 562  */
 563 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset)
 564 {
 565   SIZE size;
 566   ME_Context c;
 567   ME_String *strRunText;
 568   /* This could point to either the run's real text, or it's masked form in a password control */
 569
 570   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 571   if (pRun->nFlags & MERF_GRAPHICS)
 572   {
 573     if (nOffset)
 574       ME_GetOLEObjectSize(&c, pRun, &size);
 575     ME_DestroyContext(&c);
 576     return nOffset != 0;
 577   } else if (pRun->nFlags & MERF_ENDPARA) {
 578     nOffset = 0;
 579   }
 580
 581   if (editor->cPasswordMask)
 582     strRunText = ME_MakeStringR(editor->cPasswordMask, pRun->strText->nLen);
 583   else
 584     strRunText = pRun->strText;
 585
 586   ME_GetTextExtent(&c,  strRunText->szData, nOffset, pRun->style, &size);
 587   ME_DestroyContext(&c);
 588   if (editor->cPasswordMask)
 589     ME_DestroyString(strRunText);
 590   return size.cx;
 591 }
 592
 593 /******************************************************************************
 594  * ME_GetRunSizeCommon
 595  *
 596  * Finds width, height, ascent and descent of a run, up to given character
 597  * (nLen).
 598  */
 599 static SIZE ME_GetRunSizeCommon(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen,
 600                                 int startx, int *pAscent, int *pDescent)
 601 {
 602   SIZE size;
 603   int nMaxLen = run->strText->nLen;
 604
 605   if (nLen>nMaxLen)
 606     nLen = nMaxLen;
 607
 608   /* FIXME the following call also ensures that TEXTMETRIC structure is filled
 609    * this is wasteful for MERF_NONTEXT runs, but that shouldn't matter
 610    * in practice
 611    */
 612
 613   if (c->editor->cPasswordMask)
 614   {
 615     ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,nLen);
 616     ME_GetTextExtent(c, szMasked->szData, nLen,run->style, &size);
 617     ME_DestroyString(szMasked);
 618   }
 619   else
 620   {
 621     ME_GetTextExtent(c, run->strText->szData, nLen, run->style, &size);
 622   }
 623   *pAscent = run->style->tm.tmAscent;
 624   *pDescent = run->style->tm.tmDescent;
 625   size.cy = *pAscent + *pDescent;
 626
 627   if (run->nFlags & MERF_TAB)
 628   {
 629     int pos = 0, i = 0, ppos, shift = 0;
 630     PARAFORMAT2 *pFmt = para->pFmt;
 631
 632     if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 633         pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 634       /* The horizontal gap shifts the tab positions to leave the gap. */
 635       shift = pFmt->dxOffset * 2;
 636     do {
 637       if (i < pFmt->cTabCount)
 638       {
 639         /* Only one side of the horizontal gap is needed at the end of
 640          * the table row. */
 641         if (i == pFmt->cTabCount -1)
 642           shift = shift >> 1;
 643         pos = shift + (pFmt->rgxTabs[i]&0x00FFFFFF);
 644         i++;
 645       }
 646       else
 647       {
 648         pos += lDefaultTab - (pos % lDefaultTab);
 649       }
 650       ppos = ME_twips2pointsX(c, pos);
 651       if (ppos > startx + run->pt.x) {
 652         size.cx = ppos - startx - run->pt.x;
 653         break;
 654       }
 655     } while(1);
 656     size.cy = *pAscent + *pDescent;
 657     return size;
 658   }
 659   if (run->nFlags & MERF_GRAPHICS)
 660   {
 661     ME_GetOLEObjectSize(c, run, &size);
 662     if (size.cy > *pAscent)
 663       *pAscent = size.cy;
 664     /* descent is unchanged */
 665     return size;
 666   }
 667   return size;
 668 }
 669
 670 /******************************************************************************
 671  * ME_GetRunSize
 672  *
 673  * Finds width and height (but not ascent and descent) of a part of the run
 674  * up to given character.
 675  */
 676 SIZE ME_GetRunSize(ME_Context *c, const ME_Paragraph *para,
 677                    ME_Run *run, int nLen, int startx)
 678 {
 679   int asc, desc;
 680   return ME_GetRunSizeCommon(c, para, run, nLen, startx, &asc, &desc);
 681 }
 682
 683 /******************************************************************************
 684  * ME_CalcRunExtent
 685  *
 686  * Updates the size of the run (fills width, ascent and descent). The height
 687  * is calculated based on whole row's ascent and descent anyway, so no need
 688  * to use it here.
 689  */
 690 void ME_CalcRunExtent(ME_Context *c, const ME_Paragraph *para, int startx, ME_Run *run)
 691 {
 692   if (run->nFlags & MERF_HIDDEN)
 693     run->nWidth = 0;
 694   else
 695   {
 696     int nEnd = run->strText->nLen;
 697     SIZE size = ME_GetRunSizeCommon(c, para, run, nEnd, startx,
 698                                     &run->nAscent, &run->nDescent);
 699     run->nWidth = size.cx;
 700     if (!size.cx)
 701       WARN("size.cx == 0\n");
 702   }
 703 }
 704
 705 /******************************************************************************
 706  * ME_SetSelectionCharFormat
 707  *
 708  * Applies a style change, either to a current selection, or to insert cursor
 709  * (ie. the style next typed characters will use).
 710  */
 711 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 712 {
 713   if (!ME_IsSelection(editor))
 714   {
 715     ME_Style *s;
 716     if (!editor->pBuffer->pCharStyle)
 717       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 718     s = ME_ApplyStyle(editor->pBuffer->pCharStyle, pFmt);
 719     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 720     editor->pBuffer->pCharStyle = s;
 721   } else {
 722     ME_Cursor *from, *to;
 723     ME_GetSelection(editor, &from, &to);
 724     ME_SetCharFormat(editor, from, to, pFmt);
 725   }
 726 }
 727
 728 /******************************************************************************
 729  * ME_SetCharFormat
 730  *
 731  * Applies a style change to the specified part of the text
 732  *
 733  * The start and end cursors specify the part of the text.  These cursors will
 734  * be updated to stay valid, but this function may invalidate other
 735  * non-selection cursors. The end cursor may be NULL to specify all the text
 736  * following the start cursor.
 737  *
 738  * If no text is selected, then nothing is done.
 739  */
 740 void ME_SetCharFormat(ME_TextEditor *editor, ME_Cursor *start, ME_Cursor *end, CHARFORMAT2W *pFmt)
 741 {
 742   ME_DisplayItem *para;
 743   ME_DisplayItem *run;
 744   ME_DisplayItem *end_run = NULL;
 745
 746   if (end && start->pRun == end->pRun && start->nOffset == end->nOffset)
 747     return;
 748
 749   if (start->nOffset)
 750   {
 751     /* SplitRunSimple may or may not update the cursors, depending on whether they
 752      * are selection cursors, but we need to make sure they are valid. */
 753     int split_offset = start->nOffset;
 754     ME_DisplayItem *split_run = ME_SplitRunSimple(editor, start);
 755     if (end && end->pRun == split_run)
 756     {
 757       end->pRun = start->pRun;
 758       end->nOffset -= split_offset;
 759     }
 760   }
 761
 762   if (end && end->nOffset)
 763     ME_SplitRunSimple(editor, end);
 764   end_run = end ? end->pRun : NULL;
 765
 766   run = start->pRun;
 767   para = start->pPara;
 768   para->member.para.nFlags |= MEPF_REWRAP;
 769
 770   while(run != end_run)
 771   {
 772     ME_UndoItem *undo = NULL;
 773     ME_Style *new_style = ME_ApplyStyle(run->member.run.style, pFmt);
 774     /* ME_DumpStyle(new_style); */
 775     undo = ME_AddUndoItem(editor, diUndoSetCharFormat, NULL);
 776     if (undo) {
 777       undo->nStart = run->member.run.nCharOfs+para->member.para.nCharOfs;
 778       undo->nLen = run->member.run.strText->nLen;
 779       undo->di.member.ustyle = run->member.run.style;
 780       /* we'd have to addref undo...ustyle and release tmp...style
 781          but they'd cancel each other out so we can do nothing instead */
 782     }
 783     else
 784       ME_ReleaseStyle(run->member.run.style);
 785     run->member.run.style = new_style;
 786     run = ME_FindItemFwd(run, diRunOrParagraph);
 787     if (run && run->type == diParagraph)
 788     {
 789       para = run;
 790       run = ME_FindItemFwd(run, diRun);
 791       if (run != end_run)
 792         para->member.para.nFlags |= MEPF_REWRAP;
 793     }
 794   }
 795 }
 796
 797 /******************************************************************************
 798  * ME_SetDefaultCharFormat
 799  *
 800  * Applies a style change to the default character style.
 801  */
 802 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 803 {
 804   ME_Style *style;
 805
 806   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 807   style = ME_ApplyStyle(editor->pBuffer->pDefaultStyle, mod);
 808   editor->pBuffer->pDefaultStyle->fmt = style->fmt;
 809   editor->pBuffer->pDefaultStyle->tm = style->tm;
 810   ME_ReleaseStyle(style);
 811   ME_MarkAllForWrapping(editor);
 812   /*  pcf = editor->pBuffer->pDefaultStyle->fmt; */
 813 }
 814
 815 static void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 816 {
 817   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 818   if ((pFmt->dwMask & CFM_UNDERLINETYPE) && (pFmt->bUnderlineType == CFU_CF1UNDERLINE))
 819   {
 820     pFmt->dwMask |= CFM_UNDERLINE;
 821     pFmt->dwEffects |= CFE_UNDERLINE;
 822   }
 823   if ((pFmt->dwMask & CFM_UNDERLINETYPE) && (pFmt->bUnderlineType == CFU_UNDERLINENONE))
 824   {
 825     pFmt->dwMask |= CFM_UNDERLINE;
 826     pFmt->dwEffects &= ~CFE_UNDERLINE;
 827   }
 828 }
 829
 830 /******************************************************************************
 831  * ME_GetDefaultCharFormat
 832  *
 833  * Retrieves the current default character style (the one applied where no
 834  * other style was applied) .
 835  */
 836 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 837 {
 838   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 839 }
 840
 841 /******************************************************************************
 842  * ME_GetSelectionCharFormat
 843  *
 844  * If selection exists, it returns all style elements that are set consistently
 845  * in the whole selection. If not, it just returns the current style.
 846  */
 847 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 848 {
 849   ME_Cursor *from, *to;
 850   if (!ME_IsSelection(editor) && editor->pBuffer->pCharStyle)
 851   {
 852     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 853     return;
 854   }
 855   ME_GetSelection(editor, &from, &to);
 856   ME_GetCharFormat(editor, from, to, pFmt);
 857 }
 858
 859 /******************************************************************************
 860  * ME_GetCharFormat
 861  *
 862  * Returns the style consisting of those attributes which are consistently set
 863  * in the whole character range.
 864  */
 865 void ME_GetCharFormat(ME_TextEditor *editor, const ME_Cursor *from,
 866                       const ME_Cursor *to, CHARFORMAT2W *pFmt)
 867 {
 868   ME_DisplayItem *run, *run_end;
 869   CHARFORMAT2W tmp;
 870
 871   run = from->pRun;
 872   /* special case - if selection is empty, take previous char's formatting */
 873   if (from->pRun == to->pRun && from->nOffset == to->nOffset)
 874   {
 875     if (!from->nOffset)
 876     {
 877       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 878       if (tmp_run->type == diRun) {
 879         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 880         return;
 881       }
 882     }
 883     ME_GetRunCharFormat(editor, run, pFmt);
 884     return;
 885   }
 886
 887   run_end = to->pRun;
 888   if (!to->nOffset)
 889     run_end = ME_FindItemBack(run_end, diRun);
 890
 891   ME_GetRunCharFormat(editor, run, pFmt);
 892
 893   if (run == run_end) return;
 894
 895   do {
 896     /* FIXME add more style feature comparisons */
 897     DWORD dwAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_UNDERLINETYPE;
 898     DWORD dwEffects = CFM_BOLD | CFM_ITALIC | CFM_UNDERLINE | CFM_STRIKEOUT | CFM_PROTECTED | CFM_LINK | CFM_SUPERSCRIPT;
 899
 900     run = ME_FindItemFwd(run, diRun);
 901
 902     ZeroMemory(&tmp, sizeof(tmp));
 903     tmp.cbSize = sizeof(tmp);
 904     ME_GetRunCharFormat(editor, run, &tmp);
 905
 906     assert((tmp.dwMask & dwAttribs) == dwAttribs);
 907     /* reset flags that differ */
 908
 909     if (pFmt->yHeight != tmp.yHeight)
 910       pFmt->dwMask &= ~CFM_SIZE;
 911     if (pFmt->dwMask & CFM_FACE)
 912     {
 913       if (!(tmp.dwMask & CFM_FACE))
 914         pFmt->dwMask &= ~CFM_FACE;
 915       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName) ||
 916           pFmt->bPitchAndFamily != tmp.bPitchAndFamily)
 917         pFmt->dwMask &= ~CFM_FACE;
 918     }
 919     if (pFmt->yHeight != tmp.yHeight)
 920       pFmt->dwMask &= ~CFM_SIZE;
 921     if (pFmt->bUnderlineType != tmp.bUnderlineType)
 922       pFmt->dwMask &= ~CFM_UNDERLINETYPE;
 923     if (pFmt->dwMask & CFM_COLOR)
 924     {
 925       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 926       {
 927         if (pFmt->crTextColor != tmp.crTextColor)
 928           pFmt->dwMask &= ~CFM_COLOR;
 929       }
 930     }
 931
 932     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & dwEffects);
 933     pFmt->dwEffects = tmp.dwEffects;
 934
 935   } while(run != run_end);
 936 }