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, ME_DisplayItem *pRun, int nOfs)
 150 {
 151   ME_DisplayItem *pPara;
 152
 153   assert(pRun->type == diRun);
 154   assert(pRun->member.run.nCharOfs != -1);
 155
 156   pPara = ME_FindItemBack(pRun, diParagraph);
 157   assert(pPara);
 158   assert(pPara->type==diParagraph);
 159   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs
 160     + ME_VPosToPos(pRun->member.run.strText, nOfs);
 161 }
 162
 163 /******************************************************************************
 164  * ME_CursorFromCharOfs
 165  *
 166  * Converts a character offset (relative to the start of the document) to
 167  * a cursor structure (which contains a run and a position relative to that
 168  * run).
 169  */
 170 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 171 {
 172   ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pRun, &pCursor->nOffset);
 173 }
 174
 175 /******************************************************************************
 176  * ME_RunOfsFromCharOfs
 177  *
 178  * Find a run and relative character offset given an absolute character offset
 179  * (absolute offset being an offset relative to the start of the document).
 180  * Kind of a "global to local" offset conversion.
 181  */
 182 void ME_RunOfsFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem **ppRun, int *pOfs)
 183 {
 184   ME_DisplayItem *item, *next_item;
 185
 186   assert(ppRun);
 187   assert(pOfs);
 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
 201   /* Find the run at the offset. */
 202   next_item = ME_FindItemFwd(item, diRun);
 203   do {
 204     item = next_item;
 205     next_item = ME_FindItemFwd(item, diRunOrParagraphOrEnd);
 206   } while (next_item->type == diRun &&
 207            next_item->member.run.nCharOfs <= nCharOfs);
 208   assert(item->type == diRun);
 209   nCharOfs -= item->member.run.nCharOfs;
 210
 211   *ppRun = item;
 212   *pOfs = nCharOfs;
 213 }
 214
 215 /******************************************************************************
 216  * ME_JoinRuns
 217  *
 218  * Merges two adjacent runs, the one given as a parameter and the next one.
 219  */
 220 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 221 {
 222   ME_DisplayItem *pNext = p->next;
 223   int i;
 224   assert(p->type == diRun && pNext->type == diRun);
 225   assert(p->member.run.nCharOfs != -1);
 226   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 227
 228   /* Update all cursors so that they don't contain the soon deleted run */
 229   for (i=0; i<editor->nCursors; i++) {
 230     if (editor->pCursors[i].pRun == pNext) {
 231       editor->pCursors[i].pRun = p;
 232       editor->pCursors[i].nOffset += ME_StrVLen(p->member.run.strText);
 233     }
 234   }
 235
 236   ME_AppendString(p->member.run.strText, pNext->member.run.strText);
 237   ME_Remove(pNext);
 238   ME_DestroyDisplayItem(pNext);
 239   ME_UpdateRunFlags(editor, &p->member.run);
 240   if(TRACE_ON(richedit))
 241   {
 242     TRACE("Before check after join\n");
 243     ME_CheckCharOffsets(editor);
 244     TRACE("After check after join\n");
 245   }
 246 }
 247
 248 /******************************************************************************
 249  * ME_SplitRun
 250  *
 251  * Splits a run into two in a given place. It also updates the screen position
 252  * and size (extent) of the newly generated runs.
 253  */
 254 ME_DisplayItem *ME_SplitRun(ME_WrapContext *wc, ME_DisplayItem *item, int nVChar)
 255 {
 256   ME_TextEditor *editor = wc->context->editor;
 257   ME_DisplayItem *item2 = NULL;
 258   ME_Run *run, *run2;
 259   ME_Paragraph *para = &ME_GetParagraph(item)->member.para;
 260
 261   assert(item->member.run.nCharOfs != -1);
 262   if(TRACE_ON(richedit))
 263   {
 264     TRACE("Before check before split\n");
 265     ME_CheckCharOffsets(editor);
 266     TRACE("After check before split\n");
 267   }
 268
 269   run = &item->member.run;
 270
 271   TRACE("Before split: %s(%d, %d)\n", debugstr_w(run->strText->szData),
 272         run->pt.x, run->pt.y);
 273
 274   item2 = ME_SplitRunSimple(editor, item, nVChar);
 275
 276   run2 = &item2->member.run;
 277
 278   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
 279   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run2);
 280
 281   run2->pt.x = run->pt.x+run->nWidth;
 282   run2->pt.y = run->pt.y;
 283
 284   if(TRACE_ON(richedit))
 285   {
 286     TRACE("Before check after split\n");
 287     ME_CheckCharOffsets(editor);
 288     TRACE("After check after split\n");
 289     TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
 290       debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
 291       debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
 292   }
 293
 294   return item2;
 295 }
 296
 297 /******************************************************************************
 298  * ME_SplitRunSimple
 299  *
 300  * Does the most basic job of splitting a run into two - it does not
 301  * update the positions and extents.
 302  */
 303 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_DisplayItem *item, int nVChar)
 304 {
 305   ME_Run *run = &item->member.run;
 306   ME_DisplayItem *item2;
 307   ME_Run *run2;
 308   int i;
 309   assert(nVChar > 0 && nVChar < ME_StrVLen(run->strText));
 310   assert(item->type == diRun);
 311   assert(!(item->member.run.nFlags & MERF_NONTEXT));
 312   assert(item->member.run.nCharOfs != -1);
 313
 314   item2 = ME_MakeRun(run->style,
 315       ME_VSplitString(run->strText, nVChar), run->nFlags&MERF_SPLITMASK);
 316
 317   item2->member.run.nCharOfs = item->member.run.nCharOfs+
 318     ME_VPosToPos(item->member.run.strText, nVChar);
 319
 320   run2 = &item2->member.run;
 321   ME_InsertBefore(item->next, item2);
 322
 323   ME_UpdateRunFlags(editor, run);
 324   ME_UpdateRunFlags(editor, run2);
 325   for (i=0; i<editor->nCursors; i++) {
 326     if (editor->pCursors[i].pRun == item &&
 327         editor->pCursors[i].nOffset >= nVChar) {
 328       assert(item2->type == diRun);
 329       editor->pCursors[i].pRun = item2;
 330       editor->pCursors[i].nOffset -= nVChar;
 331     }
 332   }
 333   ME_GetParagraph(item)->member.para.nFlags |= MEPF_REWRAP;
 334   return item2;
 335 }
 336
 337 /******************************************************************************
 338  * ME_MakeRun
 339  *
 340  * A helper function to create run structures quickly.
 341  */
 342 ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
 343 {
 344   ME_DisplayItem *item = ME_MakeDI(diRun);
 345   item->member.run.style = s;
 346   item->member.run.ole_obj = NULL;
 347   item->member.run.strText = strData;
 348   item->member.run.nFlags = nFlags;
 349   item->member.run.nCharOfs = -1;
 350   ME_AddRefStyle(s);
 351   return item;
 352 }
 353
 354 /******************************************************************************
 355  * ME_InsertRun
 356  *
 357  * Inserts a run at a given character position (offset).
 358  */
 359 ME_DisplayItem *ME_InsertRun(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem *pItem)
 360 {
 361   ME_Cursor tmp;
 362   ME_DisplayItem *pDI;
 363
 364   assert(pItem->type == diRun || pItem->type == diUndoInsertRun);
 365
 366   ME_CursorFromCharOfs(editor, nCharOfs, &tmp);
 367   pDI = ME_InsertRunAtCursor(editor, &tmp, pItem->member.run.style,
 368                              pItem->member.run.strText->szData,
 369                              pItem->member.run.strText->nLen,
 370                              pItem->member.run.nFlags);
 371
 372   return pDI;
 373 }
 374
 375 /******************************************************************************
 376  * ME_InsertRunAtCursor
 377  *
 378  * Inserts a new run with given style, flags and content at a given position,
 379  * which is passed as a cursor structure (which consists of a run and
 380  * a run-relative character offset).
 381  */
 382 ME_DisplayItem *
 383 ME_InsertRunAtCursor(ME_TextEditor *editor, ME_Cursor *cursor, ME_Style *style,
 384                      const WCHAR *str, int len, int flags)
 385 {
 386   ME_DisplayItem *pDI;
 387   ME_UndoItem *pUI;
 388
 389   if (cursor->nOffset) {
 390         /* We're inserting at the middle of the existing run, which means that
 391                  * that run must be split. It isn't always necessary, but */
 392     cursor->pRun = ME_SplitRunSimple(editor, cursor->pRun, cursor->nOffset);
 393     cursor->nOffset = 0;
 394   }
 395
 396   pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
 397   if (pUI) {
 398     pUI->nStart = (ME_GetParagraph(cursor->pRun)->member.para.nCharOfs
 399                    + cursor->pRun->member.run.nCharOfs);
 400     pUI->nLen = len;
 401   }
 402
 403   pDI = ME_MakeRun(style, ME_MakeStringN(str, len), flags);
 404   pDI->member.run.nCharOfs = cursor->pRun->member.run.nCharOfs;
 405   ME_InsertBefore(cursor->pRun, pDI);
 406   TRACE("Shift length:%d\n", len);
 407   ME_PropagateCharOffset(cursor->pRun, len);
 408   ME_GetParagraph(cursor->pRun)->member.para.nFlags |= MEPF_REWRAP;
 409   return pDI;
 410 }
 411
 412 /******************************************************************************
 413  * ME_UpdateRunFlags
 414  *
 415  * Determine some of run attributes given its content (style, text content).
 416  * Some flags cannot be determined by this function (MERF_GRAPHICS,
 417  * MERF_ENDPARA)
 418  */
 419 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 420 {
 421   assert(run->nCharOfs != -1);
 422
 423   if (RUN_IS_HIDDEN(run) || run->nFlags & MERF_TABLESTART)
 424     run->nFlags |= MERF_HIDDEN;
 425   else
 426     run->nFlags &= ~MERF_HIDDEN;
 427
 428   if (ME_IsSplitable(run->strText))
 429     run->nFlags |= MERF_SPLITTABLE;
 430   else
 431     run->nFlags &= ~MERF_SPLITTABLE;
 432
 433   if (!(run->nFlags & MERF_NOTEXT)) {
 434     if (ME_IsWhitespaces(run->strText))
 435       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 436     else
 437     {
 438       run->nFlags &= ~MERF_WHITESPACE;
 439
 440       if (ME_IsWSpace(ME_GetCharFwd(run->strText,0)))
 441         run->nFlags |= MERF_STARTWHITE;
 442       else
 443         run->nFlags &= ~MERF_STARTWHITE;
 444
 445       if (ME_IsWSpace(ME_GetCharBack(run->strText,0)))
 446         run->nFlags |= MERF_ENDWHITE;
 447       else
 448         run->nFlags &= ~MERF_ENDWHITE;
 449     }
 450   }
 451   else
 452     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 453 }
 454
 455 /******************************************************************************
 456  * ME_CharFromPoint
 457  *
 458  * Returns a character position inside the run given a run-relative
 459  * pixel horizontal position. This version rounds left (ie. if the second
 460  * character is at pixel position 8, then for cx=0..7 it returns 0).
 461  */
 462 int ME_CharFromPoint(ME_Context *c, int cx, ME_Run *run)
 463 {
 464   int fit = 0;
 465   HGDIOBJ hOldFont;
 466   SIZE sz;
 467   if (!run->strText->nLen)
 468     return 0;
 469
 470   if (run->nFlags & MERF_TAB ||
 471       (run->nFlags & (MERF_ENDCELL|MERF_ENDPARA)) == MERF_ENDCELL)
 472   {
 473     if (cx < run->nWidth/2)
 474       return 0;
 475     return 1;
 476   }
 477   if (run->nFlags & MERF_GRAPHICS)
 478   {
 479     SIZE sz;
 480     ME_GetOLEObjectSize(c, run, &sz);
 481     if (cx < sz.cx)
 482       return 0;
 483     return 1;
 484   }
 485   hOldFont = ME_SelectStyleFont(c, run->style);
 486
 487   if (c->editor->cPasswordMask)
 488   {
 489     ME_String *strMasked = ME_MakeStringR(c->editor->cPasswordMask,ME_StrVLen(run->strText));
 490     GetTextExtentExPointW(c->hDC, strMasked->szData, run->strText->nLen,
 491       cx, &fit, NULL, &sz);
 492     ME_DestroyString(strMasked);
 493   }
 494   else
 495   {
 496     GetTextExtentExPointW(c->hDC, run->strText->szData, run->strText->nLen,
 497       cx, &fit, NULL, &sz);
 498   }
 499
 500   ME_UnselectStyleFont(c, run->style, hOldFont);
 501
 502   return fit;
 503 }
 504
 505 /******************************************************************************
 506  * ME_CharFromPointCursor
 507  *
 508  * Returns a character position inside the run given a run-relative
 509  * pixel horizontal position. This version rounds to the nearest character edge
 510  * (ie. if the second character is at pixel position 8, then for cx=0..3
 511  * it returns 0, and for cx=4..7 it returns 1).
 512  *
 513  * It is used for mouse click handling, for better usability (and compatibility
 514  * with the native control).
 515  */
 516 int ME_CharFromPointCursor(ME_TextEditor *editor, int cx, ME_Run *run)
 517 {
 518   ME_String *strRunText;
 519   /* This could point to either the run's real text, or it's masked form in a password control */
 520
 521   int fit = 0, fit1 = 0;
 522   ME_Context c;
 523   HGDIOBJ hOldFont;
 524   SIZE sz, sz2, sz3;
 525   if (!run->strText->nLen)
 526     return 0;
 527
 528   if (run->nFlags & (MERF_TAB | MERF_ENDCELL))
 529   {
 530     if (cx < run->nWidth/2)
 531       return 0;
 532     return 1;
 533   }
 534   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 535   if (run->nFlags & MERF_GRAPHICS)
 536   {
 537     SIZE sz;
 538     ME_GetOLEObjectSize(&c, run, &sz);
 539     ME_DestroyContext(&c);
 540     if (cx < sz.cx/2)
 541       return 0;
 542     return 1;
 543   }
 544
 545   if (editor->cPasswordMask)
 546     strRunText = ME_MakeStringR(editor->cPasswordMask,ME_StrVLen(run->strText));
 547   else
 548     strRunText = run->strText;
 549
 550   hOldFont = ME_SelectStyleFont(&c, run->style);
 551   GetTextExtentExPointW(c.hDC, strRunText->szData, strRunText->nLen,
 552                         cx, &fit, NULL, &sz);
 553   if (fit != strRunText->nLen)
 554   {
 555     int chars = 1;
 556
 557     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit, &sz2);
 558     fit1 = ME_StrRelPos(strRunText, fit, &chars);
 559     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit1, &sz3);
 560     if (cx >= (sz2.cx+sz3.cx)/2)
 561       fit = fit1;
 562   }
 563
 564   if (editor->cPasswordMask)
 565     ME_DestroyString(strRunText);
 566
 567   ME_UnselectStyleFont(&c, run->style, hOldFont);
 568   ME_DestroyContext(&c);
 569   return fit;
 570 }
 571
 572 /******************************************************************************
 573  * ME_GetTextExtent
 574  *
 575  * Finds a width and a height of the text using a specified style
 576  */
 577 static void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s, SIZE *size)
 578 {
 579   HGDIOBJ hOldFont;
 580   hOldFont = ME_SelectStyleFont(c, s);
 581   GetTextExtentPoint32W(c->hDC, szText, nChars, size);
 582   ME_UnselectStyleFont(c, s, hOldFont);
 583 }
 584
 585 /******************************************************************************
 586  * ME_PointFromChar
 587  *
 588  * Returns a run-relative pixel position given a run-relative character
 589  * position (character offset)
 590  */
 591 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset)
 592 {
 593   SIZE size;
 594   ME_Context c;
 595   ME_String *strRunText;
 596   /* This could point to either the run's real text, or it's masked form in a password control */
 597
 598   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 599   if (pRun->nFlags & MERF_GRAPHICS)
 600   {
 601     if (nOffset)
 602       ME_GetOLEObjectSize(&c, pRun, &size);
 603     ITextHost_TxReleaseDC(editor->texthost, c.hDC);
 604     return nOffset != 0;
 605   } else if (pRun->nFlags & MERF_ENDPARA) {
 606     nOffset = 0;
 607   }
 608
 609   if (editor->cPasswordMask)
 610     strRunText = ME_MakeStringR(editor->cPasswordMask,ME_StrVLen(pRun->strText));
 611   else
 612     strRunText = pRun->strText;
 613
 614   ME_GetTextExtent(&c,  strRunText->szData, nOffset, pRun->style, &size);
 615   ITextHost_TxReleaseDC(editor->texthost, c.hDC);
 616   if (editor->cPasswordMask)
 617     ME_DestroyString(strRunText);
 618   return size.cx;
 619 }
 620
 621 /******************************************************************************
 622  * ME_GetRunSizeCommon
 623  *
 624  * Finds width, height, ascent and descent of a run, up to given character
 625  * (nLen).
 626  */
 627 static SIZE ME_GetRunSizeCommon(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen,
 628                                 int startx, int *pAscent, int *pDescent)
 629 {
 630   SIZE size;
 631   int nMaxLen = ME_StrVLen(run->strText);
 632
 633   if (nLen>nMaxLen)
 634     nLen = nMaxLen;
 635
 636   /* FIXME the following call also ensures that TEXTMETRIC structure is filled
 637    * this is wasteful for MERF_NONTEXT runs, but that shouldn't matter
 638    * in practice
 639    */
 640
 641   if (c->editor->cPasswordMask)
 642   {
 643     ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,nLen);
 644     ME_GetTextExtent(c, szMasked->szData, nLen,run->style, &size);
 645     ME_DestroyString(szMasked);
 646   }
 647   else
 648   {
 649     ME_GetTextExtent(c, run->strText->szData, nLen, run->style, &size);
 650   }
 651   *pAscent = run->style->tm.tmAscent;
 652   *pDescent = run->style->tm.tmDescent;
 653   size.cy = *pAscent + *pDescent;
 654
 655   if (run->nFlags & MERF_TAB)
 656   {
 657     int pos = 0, i = 0, ppos, shift = 0;
 658     PARAFORMAT2 *pFmt = para->pFmt;
 659
 660     if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 661         pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 662       /* The horizontal gap shifts the tab positions to leave the gap. */
 663       shift = pFmt->dxOffset * 2;
 664     do {
 665       if (i < pFmt->cTabCount)
 666       {
 667         /* Only one side of the horizontal gap is needed at the end of
 668          * the table row. */
 669         if (i == pFmt->cTabCount -1)
 670           shift = shift >> 1;
 671         pos = shift + (pFmt->rgxTabs[i]&0x00FFFFFF);
 672         i++;
 673       }
 674       else
 675       {
 676         pos += lDefaultTab - (pos % lDefaultTab);
 677       }
 678       ppos = ME_twips2pointsX(c, pos);
 679       if (ppos > startx + run->pt.x) {
 680         size.cx = ppos - startx - run->pt.x;
 681         break;
 682       }
 683     } while(1);
 684     size.cy = *pAscent + *pDescent;
 685     return size;
 686   }
 687   if (run->nFlags & MERF_GRAPHICS)
 688   {
 689     ME_GetOLEObjectSize(c, run, &size);
 690     if (size.cy > *pAscent)
 691       *pAscent = size.cy;
 692     /* descent is unchanged */
 693     return size;
 694   }
 695   return size;
 696 }
 697
 698 /******************************************************************************
 699  * ME_GetRunSize
 700  *
 701  * Finds width and height (but not ascent and descent) of a part of the run
 702  * up to given character.
 703  */
 704 SIZE ME_GetRunSize(ME_Context *c, const ME_Paragraph *para,
 705                    ME_Run *run, int nLen, int startx)
 706 {
 707   int asc, desc;
 708   return ME_GetRunSizeCommon(c, para, run, nLen, startx, &asc, &desc);
 709 }
 710
 711 /******************************************************************************
 712  * ME_CalcRunExtent
 713  *
 714  * Updates the size of the run (fills width, ascent and descent). The height
 715  * is calculated based on whole row's ascent and descent anyway, so no need
 716  * to use it here.
 717  */
 718 void ME_CalcRunExtent(ME_Context *c, const ME_Paragraph *para, int startx, ME_Run *run)
 719 {
 720   if (run->nFlags & MERF_HIDDEN)
 721     run->nWidth = 0;
 722   else
 723   {
 724     int nEnd = ME_StrVLen(run->strText);
 725     SIZE size = ME_GetRunSizeCommon(c, para, run, nEnd, startx,
 726                                     &run->nAscent, &run->nDescent);
 727     run->nWidth = size.cx;
 728     if (!size.cx)
 729       WARN("size.cx == 0\n");
 730   }
 731 }
 732
 733 /******************************************************************************
 734  * ME_MustBeWrapped
 735  *
 736  * This should ensure that the given paragraph is wrapped so that its screen
 737  * row structure may be used. But it doesn't, yet.
 738  */
 739 void ME_MustBeWrapped(ME_Context *c, ME_DisplayItem *para)
 740 {
 741   assert(para->type == diParagraph);
 742   /* FIXME */
 743 }
 744
 745 /******************************************************************************
 746  * ME_SetSelectionCharFormat
 747  *
 748  * Applies a style change, either to a current selection, or to insert cursor
 749  * (ie. the style next typed characters will use).
 750  */
 751 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 752 {
 753   int nFrom, nTo;
 754   ME_GetSelection(editor, &nFrom, &nTo);
 755   if (nFrom == nTo)
 756   {
 757     ME_Style *s;
 758     if (!editor->pBuffer->pCharStyle)
 759       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 760     s = ME_ApplyStyle(editor->pBuffer->pCharStyle, pFmt);
 761     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 762     editor->pBuffer->pCharStyle = s;
 763   }
 764   else
 765     ME_SetCharFormat(editor, nFrom, nTo-nFrom, pFmt);
 766 }
 767
 768 /******************************************************************************
 769  * ME_SetCharFormat
 770  *
 771  * Applies a style change to the specified part of the text
 772  */
 773 void ME_SetCharFormat(ME_TextEditor *editor, int nOfs, int nChars, CHARFORMAT2W *pFmt)
 774 {
 775   ME_Cursor tmp, tmp2;
 776   ME_DisplayItem *para;
 777
 778   ME_CursorFromCharOfs(editor, nOfs, &tmp);
 779   if (tmp.nOffset)
 780     tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
 781
 782   ME_CursorFromCharOfs(editor, nOfs+nChars, &tmp2);
 783   if (tmp2.nOffset)
 784     tmp2.pRun = ME_SplitRunSimple(editor, tmp2.pRun, tmp2.nOffset);
 785
 786   para = ME_GetParagraph(tmp.pRun);
 787   para->member.para.nFlags |= MEPF_REWRAP;
 788
 789   while(tmp.pRun != tmp2.pRun)
 790   {
 791     ME_UndoItem *undo = NULL;
 792     ME_Style *new_style = ME_ApplyStyle(tmp.pRun->member.run.style, pFmt);
 793     /* ME_DumpStyle(new_style); */
 794     undo = ME_AddUndoItem(editor, diUndoSetCharFormat, NULL);
 795     if (undo) {
 796       undo->nStart = tmp.pRun->member.run.nCharOfs+para->member.para.nCharOfs;
 797       undo->nLen = tmp.pRun->member.run.strText->nLen;
 798       undo->di.member.ustyle = tmp.pRun->member.run.style;
 799       /* we'd have to addref undo...ustyle and release tmp...style
 800          but they'd cancel each other out so we can do nothing instead */
 801     }
 802     else
 803       ME_ReleaseStyle(tmp.pRun->member.run.style);
 804     tmp.pRun->member.run.style = new_style;
 805     tmp.pRun = ME_FindItemFwd(tmp.pRun, diRunOrParagraph);
 806     if (tmp.pRun->type == diParagraph)
 807     {
 808       para = tmp.pRun;
 809       tmp.pRun = ME_FindItemFwd(tmp.pRun, diRun);
 810       if (tmp.pRun != tmp2.pRun)
 811         para->member.para.nFlags |= MEPF_REWRAP;
 812     }
 813     assert(tmp.pRun);
 814   }
 815 }
 816
 817 /******************************************************************************
 818  * ME_SetDefaultCharFormat
 819  *
 820  * Applies a style change to the default character style.
 821  */
 822 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 823 {
 824   ME_Style *style;
 825
 826   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 827   style = ME_ApplyStyle(editor->pBuffer->pDefaultStyle, mod);
 828   editor->pBuffer->pDefaultStyle->fmt = style->fmt;
 829   editor->pBuffer->pDefaultStyle->tm = style->tm;
 830   ME_ReleaseStyle(style);
 831   ME_MarkAllForWrapping(editor);
 832   /*  pcf = editor->pBuffer->pDefaultStyle->fmt; */
 833 }
 834
 835 static void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 836 {
 837   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 838   if ((pFmt->dwMask & CFM_UNDERLINETYPE) && (pFmt->bUnderlineType == CFU_CF1UNDERLINE))
 839   {
 840     pFmt->dwMask |= CFM_UNDERLINE;
 841     pFmt->dwEffects |= CFE_UNDERLINE;
 842   }
 843   if ((pFmt->dwMask & CFM_UNDERLINETYPE) && (pFmt->bUnderlineType == CFU_UNDERLINENONE))
 844   {
 845     pFmt->dwMask |= CFM_UNDERLINE;
 846     pFmt->dwEffects &= ~CFE_UNDERLINE;
 847   }
 848 }
 849
 850 /******************************************************************************
 851  * ME_GetDefaultCharFormat
 852  *
 853  * Retrieves the current default character style (the one applied where no
 854  * other style was applied) .
 855  */
 856 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 857 {
 858   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 859 }
 860
 861 /******************************************************************************
 862  * ME_GetSelectionCharFormat
 863  *
 864  * If selection exists, it returns all style elements that are set consistently
 865  * in the whole selection. If not, it just returns the current style.
 866  */
 867 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 868 {
 869   int nFrom, nTo;
 870   ME_GetSelection(editor, &nFrom, &nTo);
 871   if (nFrom == nTo && editor->pBuffer->pCharStyle)
 872   {
 873     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 874     return;
 875   }
 876   ME_GetCharFormat(editor, nFrom, nTo, pFmt);
 877 }
 878
 879 /******************************************************************************
 880  * ME_GetCharFormat
 881  *
 882  * Returns the style consisting of those attributes which are consistently set
 883  * in the whole character range.
 884  */
 885 void ME_GetCharFormat(ME_TextEditor *editor, int nFrom, int nTo, CHARFORMAT2W *pFmt)
 886 {
 887   ME_DisplayItem *run, *run_end;
 888   int nOffset, nOffset2;
 889   CHARFORMAT2W tmp;
 890
 891   ME_RunOfsFromCharOfs(editor, nFrom, &run, &nOffset);
 892   if (nFrom == nTo) /* special case - if selection is empty, take previous char's formatting */
 893   {
 894     if (!nOffset)
 895     {
 896       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 897       if (tmp_run->type == diRun) {
 898         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 899         return;
 900       }
 901     }
 902     ME_GetRunCharFormat(editor, run, pFmt);
 903     return;
 904   }
 905
 906   if (nTo>nFrom) /* selection consists of chars from nFrom up to nTo-1 */
 907     nTo--;
 908   ME_RunOfsFromCharOfs(editor, nTo, &run_end, &nOffset2);
 909
 910   ME_GetRunCharFormat(editor, run, pFmt);
 911
 912   if (run == run_end) return;
 913
 914   do {
 915     /* FIXME add more style feature comparisons */
 916     int nAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_UNDERLINETYPE;
 917     int nEffects = CFM_BOLD | CFM_ITALIC | CFM_UNDERLINE | CFM_STRIKEOUT | CFM_PROTECTED | CFM_LINK | CFM_SUPERSCRIPT;
 918
 919     run = ME_FindItemFwd(run, diRun);
 920
 921     ZeroMemory(&tmp, sizeof(tmp));
 922     tmp.cbSize = sizeof(tmp);
 923     ME_GetRunCharFormat(editor, run, &tmp);
 924
 925     assert((tmp.dwMask & nAttribs) == nAttribs);
 926     /* reset flags that differ */
 927
 928     if (pFmt->yHeight != tmp.yHeight)
 929       pFmt->dwMask &= ~CFM_SIZE;
 930     if (pFmt->dwMask & CFM_FACE)
 931     {
 932       if (!(tmp.dwMask & CFM_FACE))
 933         pFmt->dwMask &= ~CFM_FACE;
 934       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName) ||
 935           pFmt->bPitchAndFamily != tmp.bPitchAndFamily)
 936         pFmt->dwMask &= ~CFM_FACE;
 937     }
 938     if (pFmt->yHeight != tmp.yHeight)
 939       pFmt->dwMask &= ~CFM_SIZE;
 940     if (pFmt->bUnderlineType != tmp.bUnderlineType)
 941       pFmt->dwMask &= ~CFM_UNDERLINETYPE;
 942     if (pFmt->dwMask & CFM_COLOR)
 943     {
 944       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 945       {
 946         if (pFmt->crTextColor != tmp.crTextColor)
 947           pFmt->dwMask &= ~CFM_COLOR;
 948       }
 949     }
 950
 951     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & nEffects);
 952     pFmt->dwEffects = tmp.dwEffects;
 953
 954   } while(run != run_end);
 955 }