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         if (p->member.run.nFlags & MERF_ENDPARA)
 131           ofs += (editor->bEmulateVersion10 ? 2 : 1);
 132         else
 133           ofs += ME_StrLen(p->member.run.strText);
 134         break;
 135       default:
 136         assert(0);
 137     }
 138   } while(1);
 139 }
 140
 141 /******************************************************************************
 142  * ME_CharOfsFromRunOfs
 143  *
 144  * Converts a character position relative to the start of the run, to a
 145  * character position relative to the start of the document.
 146  * Kind of a "local to global" offset conversion.
 147  */
 148 int ME_CharOfsFromRunOfs(ME_TextEditor *editor, ME_DisplayItem *pRun, int nOfs)
 149 {
 150   ME_DisplayItem *pPara;
 151
 152   assert(pRun->type == diRun);
 153   assert(pRun->member.run.nCharOfs != -1);
 154
 155   pPara = ME_FindItemBack(pRun, diParagraph);
 156   assert(pPara);
 157   assert(pPara->type==diParagraph);
 158   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs
 159     + ME_VPosToPos(pRun->member.run.strText, nOfs);
 160 }
 161
 162 /******************************************************************************
 163  * ME_CursorFromCharOfs
 164  *
 165  * Converts a character offset (relative to the start of the document) to
 166  * a cursor structure (which contains a run and a position relative to that
 167  * run).
 168  */
 169 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 170 {
 171   ME_RunOfsFromCharOfs(editor, nCharOfs, &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, int nCharOfs, ME_DisplayItem **ppRun, int *pOfs)
 182 {
 183   ME_DisplayItem *pPara;
 184   int nParaOfs;
 185
 186   pPara = editor->pBuffer->pFirst->member.para.next_para;
 187   assert(pPara);
 188   assert(ppRun);
 189   assert(pOfs);
 190   while (pPara->type == diParagraph)
 191   {
 192     nParaOfs = pPara->member.para.nCharOfs;
 193     assert(nCharOfs >= nParaOfs);
 194
 195     if (nCharOfs < pPara->member.para.next_para->member.para.nCharOfs)
 196     {
 197       int eollen = 1;
 198       *ppRun = ME_FindItemFwd(pPara, diRun);
 199       assert(*ppRun);
 200       while (!((*ppRun)->member.run.nFlags & MERF_ENDPARA))
 201       {
 202         ME_DisplayItem *pNext = ME_FindItemFwd(*ppRun, diRun);
 203         assert(pNext);
 204         assert(pNext->type == diRun);
 205         if (nCharOfs < nParaOfs + pNext->member.run.nCharOfs) {
 206           *pOfs = ME_PosToVPos((*ppRun)->member.run.strText,
 207             nCharOfs - nParaOfs - (*ppRun)->member.run.nCharOfs);
 208           return;
 209         }
 210         *ppRun = pNext;
 211       }
 212       /* the handling of bEmulateVersion10 may be a source of many bugs, I'm afraid */
 213       eollen = (editor->bEmulateVersion10 ? 2 : 1);
 214       if (nCharOfs >= nParaOfs + (*ppRun)->member.run.nCharOfs &&
 215         nCharOfs < nParaOfs + (*ppRun)->member.run.nCharOfs + eollen) {
 216         *pOfs = 0;
 217         return;
 218       }
 219     }
 220     pPara = pPara->member.para.next_para;
 221   }
 222   *ppRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 223   *pOfs = 0;
 224   assert((*ppRun)->member.run.nFlags & MERF_ENDPARA);
 225 }
 226
 227 /******************************************************************************
 228  * ME_JoinRuns
 229  *
 230  * Merges two adjacent runs, the one given as a parameter and the next one.
 231  */
 232 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 233 {
 234   ME_DisplayItem *pNext = p->next;
 235   int i;
 236   assert(p->type == diRun && pNext->type == diRun);
 237   assert(p->member.run.nCharOfs != -1);
 238   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 239
 240   /* if we were at the end of screen line, and the next run is in the new
 241          * line, then it's not the end of the line anymore */
 242         if (editor->bCaretAtEnd && editor->pCursors[0].pRun == pNext)
 243     editor->bCaretAtEnd = FALSE;
 244         /* Update all cursors so that they don't contain the soon deleted run */
 245   for (i=0; i<editor->nCursors; i++) {
 246     if (editor->pCursors[i].pRun == pNext) {
 247       editor->pCursors[i].pRun = p;
 248       editor->pCursors[i].nOffset += ME_StrVLen(p->member.run.strText);
 249     }
 250   }
 251
 252   ME_AppendString(p->member.run.strText, pNext->member.run.strText);
 253   ME_Remove(pNext);
 254   ME_DestroyDisplayItem(pNext);
 255   ME_UpdateRunFlags(editor, &p->member.run);
 256   if(TRACE_ON(richedit))
 257   {
 258     TRACE("Before check after join\n");
 259     ME_CheckCharOffsets(editor);
 260     TRACE("After check after join\n");
 261   }
 262 }
 263
 264 /******************************************************************************
 265  * ME_SplitRun
 266  *
 267  * Splits a run into two in a given place. It also updates the screen position
 268  * and size (extent) of the newly generated runs.
 269  */
 270 ME_DisplayItem *ME_SplitRun(ME_Context *c, ME_DisplayItem *item, int nVChar)
 271 {
 272   ME_TextEditor *editor = c->editor;
 273   ME_DisplayItem *item2 = NULL;
 274   ME_Run *run, *run2;
 275   ME_Paragraph *para = &ME_GetParagraph(item)->member.para;
 276
 277   assert(item->member.run.nCharOfs != -1);
 278   if(TRACE_ON(richedit))
 279   {
 280     TRACE("Before check before split\n");
 281     ME_CheckCharOffsets(editor);
 282     TRACE("After check before split\n");
 283   }
 284
 285   run = &item->member.run;
 286
 287   TRACE("Before split: %s(%d, %d)\n", debugstr_w(run->strText->szData),
 288         run->pt.x, run->pt.y);
 289
 290   item2 = ME_SplitRunSimple(editor, item, nVChar);
 291
 292   run2 = &item2->member.run;
 293
 294   ME_CalcRunExtent(c, para, run);
 295   ME_CalcRunExtent(c, para, run2);
 296
 297   run2->pt.x = run->pt.x+run->nWidth;
 298   run2->pt.y = run->pt.y;
 299
 300   if(TRACE_ON(richedit))
 301   {
 302     TRACE("Before check after split\n");
 303     ME_CheckCharOffsets(editor);
 304     TRACE("After check after split\n");
 305     TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
 306       debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
 307       debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
 308   }
 309
 310   return item2;
 311 }
 312
 313 /******************************************************************************
 314  * ME_SplitRunSimple
 315  *
 316  * Does the most basic job of splitting a run into two - it does not
 317  * update the positions and extents.
 318  */
 319 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_DisplayItem *item, int nVChar)
 320 {
 321   ME_Run *run = &item->member.run;
 322   ME_DisplayItem *item2;
 323   ME_Run *run2;
 324   int i;
 325   assert(nVChar > 0 && nVChar < ME_StrVLen(run->strText));
 326   assert(item->type == diRun);
 327   assert(!(item->member.run.nFlags & MERF_NONTEXT));
 328   assert(item->member.run.nCharOfs != -1);
 329
 330   item2 = ME_MakeRun(run->style,
 331       ME_VSplitString(run->strText, nVChar), run->nFlags&MERF_SPLITMASK);
 332
 333   item2->member.run.nCharOfs = item->member.run.nCharOfs+
 334     ME_VPosToPos(item->member.run.strText, nVChar);
 335
 336   run2 = &item2->member.run;
 337   ME_InsertBefore(item->next, item2);
 338
 339   ME_UpdateRunFlags(editor, run);
 340   ME_UpdateRunFlags(editor, run2);
 341   for (i=0; i<editor->nCursors; i++) {
 342     if (editor->pCursors[i].pRun == item &&
 343         editor->pCursors[i].nOffset >= nVChar) {
 344       assert(item2->type == diRun);
 345       editor->pCursors[i].pRun = item2;
 346       editor->pCursors[i].nOffset -= nVChar;
 347     }
 348   }
 349   ME_GetParagraph(item)->member.para.nFlags |= MEPF_REWRAP;
 350   return item2;
 351 }
 352
 353 /******************************************************************************
 354  * ME_MakeRun
 355  *
 356  * A helper function to create run structures quickly.
 357  */
 358 ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
 359 {
 360   ME_DisplayItem *item = ME_MakeDI(diRun);
 361   item->member.run.style = s;
 362   item->member.run.ole_obj = NULL;
 363   item->member.run.strText = strData;
 364   item->member.run.nFlags = nFlags;
 365   item->member.run.nCharOfs = -1;
 366   ME_AddRefStyle(s);
 367   return item;
 368 }
 369
 370 /******************************************************************************
 371  * ME_InsertRun
 372  *
 373  * Inserts a run at a given character position (offset).
 374  */
 375 ME_DisplayItem *ME_InsertRun(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem *pItem)
 376 {
 377   ME_Cursor tmp;
 378   ME_DisplayItem *pDI;
 379
 380   assert(pItem->type == diRun || pItem->type == diUndoInsertRun);
 381
 382   ME_CursorFromCharOfs(editor, nCharOfs, &tmp);
 383   pDI = ME_InsertRunAtCursor(editor, &tmp, pItem->member.run.style,
 384                              pItem->member.run.strText->szData,
 385                              pItem->member.run.strText->nLen,
 386                              pItem->member.run.nFlags);
 387
 388   return pDI;
 389 }
 390
 391 /******************************************************************************
 392  * ME_InsertRunAtCursor
 393  *
 394  * Inserts a new run with given style, flags and content at a given position,
 395  * which is passed as a cursor structure (which consists of a run and
 396  * a run-relative character offset).
 397  */
 398 ME_DisplayItem *
 399 ME_InsertRunAtCursor(ME_TextEditor *editor, ME_Cursor *cursor, ME_Style *style,
 400                      const WCHAR *str, int len, int flags)
 401 {
 402   ME_DisplayItem *pDI;
 403   ME_UndoItem *pUI;
 404
 405   if (cursor->nOffset) {
 406         /* We're inserting at the middle of the existing run, which means that
 407                  * that run must be split. It isn't always necessary, but */
 408     cursor->pRun = ME_SplitRunSimple(editor, cursor->pRun, cursor->nOffset);
 409     cursor->nOffset = 0;
 410   }
 411
 412   pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
 413   if (pUI) {
 414     pUI->nStart = (ME_GetParagraph(cursor->pRun)->member.para.nCharOfs
 415                    + cursor->pRun->member.run.nCharOfs);
 416     pUI->nLen = len;
 417   }
 418
 419   pDI = ME_MakeRun(style, ME_MakeStringN(str, len), flags);
 420   pDI->member.run.nCharOfs = cursor->pRun->member.run.nCharOfs;
 421   ME_InsertBefore(cursor->pRun, pDI);
 422   TRACE("Shift length:%d\n", len);
 423   ME_PropagateCharOffset(cursor->pRun, len);
 424   ME_GetParagraph(cursor->pRun)->member.para.nFlags |= MEPF_REWRAP;
 425   return pDI;
 426 }
 427
 428 /******************************************************************************
 429  * ME_UpdateRunFlags
 430  *
 431  * Determine some of run attributes given its content (style, text content).
 432  * Some flags cannot be determined by this function (MERF_GRAPHICS,
 433  * MERF_ENDPARA)
 434  */
 435 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 436 {
 437   assert(run->nCharOfs != -1);
 438
 439   if (RUN_IS_HIDDEN(run))
 440     run->nFlags |= MERF_HIDDEN;
 441   else
 442     run->nFlags &= ~MERF_HIDDEN;
 443
 444   if (ME_IsSplitable(run->strText))
 445     run->nFlags |= MERF_SPLITTABLE;
 446   else
 447     run->nFlags &= ~MERF_SPLITTABLE;
 448
 449   if (!(run->nFlags & MERF_NOTEXT)) {
 450     if (ME_IsWhitespaces(run->strText))
 451       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 452     else
 453     {
 454       run->nFlags &= ~MERF_WHITESPACE;
 455
 456       if (ME_IsWSpace(ME_GetCharFwd(run->strText,0)))
 457         run->nFlags |= MERF_STARTWHITE;
 458       else
 459         run->nFlags &= ~MERF_STARTWHITE;
 460
 461       if (ME_IsWSpace(ME_GetCharBack(run->strText,0)))
 462         run->nFlags |= MERF_ENDWHITE;
 463       else
 464         run->nFlags &= ~MERF_ENDWHITE;
 465     }
 466   }
 467   else
 468     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 469 }
 470
 471 /******************************************************************************
 472  * ME_CharFromPoint
 473  *
 474  * Returns a character position inside the run given a run-relative
 475  * pixel horizontal position. This version rounds left (ie. if the second
 476  * character is at pixel position 8, then for cx=0..7 it returns 0).
 477  */
 478 int ME_CharFromPoint(ME_Context *c, int cx, ME_Run *run)
 479 {
 480   int fit = 0;
 481   HGDIOBJ hOldFont;
 482   SIZE sz;
 483   if (!run->strText->nLen)
 484     return 0;
 485
 486   if (run->nFlags & (MERF_TAB | MERF_CELL))
 487   {
 488     if (cx < run->nWidth/2)
 489       return 0;
 490     return 1;
 491   }
 492   if (run->nFlags & MERF_GRAPHICS)
 493   {
 494     SIZE sz;
 495     ME_GetOLEObjectSize(c, run, &sz);
 496     if (cx < sz.cx)
 497       return 0;
 498     return 1;
 499   }
 500   hOldFont = ME_SelectStyleFont(c, run->style);
 501
 502   if (c->editor->cPasswordMask)
 503   {
 504     ME_String *strMasked = ME_MakeStringR(c->editor->cPasswordMask,ME_StrVLen(run->strText));
 505     GetTextExtentExPointW(c->hDC, strMasked->szData, run->strText->nLen,
 506       cx, &fit, NULL, &sz);
 507     ME_DestroyString(strMasked);
 508   }
 509   else
 510   {
 511     GetTextExtentExPointW(c->hDC, run->strText->szData, run->strText->nLen,
 512       cx, &fit, NULL, &sz);
 513   }
 514
 515   ME_UnselectStyleFont(c, run->style, hOldFont);
 516
 517   return fit;
 518 }
 519
 520 /******************************************************************************
 521  * ME_CharFromPointCursor
 522  *
 523  * Returns a character position inside the run given a run-relative
 524  * pixel horizontal position. This version rounds to the nearest character edge
 525  * (ie. if the second character is at pixel position 8, then for cx=0..3
 526  * it returns 0, and for cx=4..7 it returns 1).
 527  *
 528  * It is used for mouse click handling, for better usability (and compatibility
 529  * with the native control).
 530  */
 531 int ME_CharFromPointCursor(ME_TextEditor *editor, int cx, ME_Run *run)
 532 {
 533   ME_String *strRunText;
 534   /* This could point to either the run's real text, or it's masked form in a password control */
 535
 536   int fit = 0, fit1 = 0;
 537   ME_Context c;
 538   HGDIOBJ hOldFont;
 539   SIZE sz, sz2, sz3;
 540   if (!run->strText->nLen)
 541     return 0;
 542
 543   if (run->nFlags & (MERF_TAB | MERF_CELL))
 544   {
 545     if (cx < run->nWidth/2)
 546       return 0;
 547     return 1;
 548   }
 549   ME_InitContext(&c, editor, GetDC(editor->hWnd));
 550   if (run->nFlags & MERF_GRAPHICS)
 551   {
 552     SIZE sz;
 553     ME_GetOLEObjectSize(&c, run, &sz);
 554     ReleaseDC(editor->hWnd, c.hDC);
 555     if (cx < sz.cx/2)
 556       return 0;
 557     return 1;
 558   }
 559
 560   if (editor->cPasswordMask)
 561     strRunText = ME_MakeStringR(editor->cPasswordMask,ME_StrVLen(run->strText));
 562   else
 563     strRunText = run->strText;
 564
 565   hOldFont = ME_SelectStyleFont(&c, run->style);
 566   GetTextExtentExPointW(c.hDC, strRunText->szData, strRunText->nLen,
 567                         cx, &fit, NULL, &sz);
 568   if (fit != strRunText->nLen)
 569   {
 570     int chars = 1;
 571
 572     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit, &sz2);
 573     fit1 = ME_StrRelPos(strRunText, fit, &chars);
 574     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit1, &sz3);
 575     if (cx >= (sz2.cx+sz3.cx)/2)
 576       fit = fit1;
 577   }
 578
 579   if (editor->cPasswordMask)
 580     ME_DestroyString(strRunText);
 581
 582   ME_UnselectStyleFont(&c, run->style, hOldFont);
 583   ReleaseDC(editor->hWnd, c.hDC);
 584   return fit;
 585 }
 586
 587 /******************************************************************************
 588  * ME_GetTextExtent
 589  *
 590  * Finds a width and a height of the text using a specified style
 591  */
 592 static void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s, SIZE *size)
 593 {
 594   HGDIOBJ hOldFont;
 595   hOldFont = ME_SelectStyleFont(c, s);
 596   GetTextExtentPoint32W(c->hDC, szText, nChars, size);
 597   ME_UnselectStyleFont(c, s, hOldFont);
 598 }
 599
 600 /******************************************************************************
 601  * ME_PointFromChar
 602  *
 603  * Returns a run-relative pixel position given a run-relative character
 604  * position (character offset)
 605  */
 606 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset)
 607 {
 608   SIZE size;
 609   ME_Context c;
 610   ME_String *strRunText;
 611   /* This could point to either the run's real text, or it's masked form in a password control */
 612
 613   ME_InitContext(&c, editor, GetDC(editor->hWnd));
 614   if (pRun->nFlags & MERF_GRAPHICS)
 615   {
 616     if (nOffset)
 617       ME_GetOLEObjectSize(&c, pRun, &size);
 618     ReleaseDC(editor->hWnd, c.hDC);
 619     return nOffset != 0;
 620   }
 621
 622    if (editor->cPasswordMask)
 623     strRunText = ME_MakeStringR(editor->cPasswordMask,ME_StrVLen(pRun->strText));
 624   else
 625     strRunText = pRun->strText;
 626
 627   ME_GetTextExtent(&c,  strRunText->szData, nOffset, pRun->style, &size);
 628   ReleaseDC(editor->hWnd, c.hDC);
 629   if (editor->cPasswordMask)
 630     ME_DestroyString(strRunText);
 631   return size.cx;
 632 }
 633
 634 /******************************************************************************
 635  * ME_GetRunSizeCommon
 636  *
 637  * Finds width, height, ascent and descent of a run, up to given character
 638  * (nLen).
 639  */
 640 static SIZE ME_GetRunSizeCommon(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen,
 641                                 int *pAscent, int *pDescent)
 642 {
 643   SIZE size;
 644   int nMaxLen = ME_StrVLen(run->strText);
 645
 646   if (nLen>nMaxLen)
 647     nLen = nMaxLen;
 648
 649   /* FIXME the following call also ensures that TEXTMETRIC structure is filled
 650    * this is wasteful for MERF_NONTEXT runs, but that shouldn't matter
 651    * in practice
 652    */
 653
 654   if (c->editor->cPasswordMask)
 655   {
 656     ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,nLen);
 657     ME_GetTextExtent(c, szMasked->szData, nLen,run->style, &size);
 658     ME_DestroyString(szMasked);
 659   }
 660   else
 661   {
 662     ME_GetTextExtent(c, run->strText->szData, nLen, run->style, &size);
 663   }
 664   *pAscent = run->style->tm.tmAscent;
 665   *pDescent = run->style->tm.tmDescent;
 666   size.cy = *pAscent + *pDescent;
 667
 668   if (run->nFlags & MERF_TAB)
 669   {
 670     int pos = 0, i = 0, ppos;
 671
 672     PARAFORMAT2 *pFmt = para->pFmt;
 673     do {
 674       if (i < pFmt->cTabCount)
 675       {
 676         pos = pFmt->rgxTabs[i]&0x00FFFFFF;
 677         i++;
 678       }
 679       else
 680       {
 681         pos += 720-(pos%720);
 682       }
 683       ppos = ME_twips2pointsX(c, pos);
 684       if (ppos>run->pt.x) {
 685         size.cx = ppos - run->pt.x;
 686         break;
 687       }
 688     } while(1);
 689     size.cy = *pAscent + *pDescent;
 690     return size;
 691   }
 692   if (run->nFlags & MERF_GRAPHICS)
 693   {
 694     ME_GetOLEObjectSize(c, run, &size);
 695     if (size.cy > *pAscent)
 696       *pAscent = size.cy;
 697     /* descent is unchanged */
 698     return size;
 699   }
 700   if (run->nFlags & MERF_CELL)
 701   {
 702     size.cx = ME_twips2pointsX(c, run->pCell->nRightBoundary) - run->pt.x;
 703     return size;
 704   }
 705   return size;
 706 }
 707
 708 /******************************************************************************
 709  * ME_GetRunSize
 710  *
 711  * Finds width and height (but not ascent and descent) of a part of the run
 712  * up to given character.
 713  */
 714 SIZE ME_GetRunSize(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen)
 715 {
 716   int asc, desc;
 717   return ME_GetRunSizeCommon(c, para, run, nLen, &asc, &desc);
 718 }
 719
 720 /******************************************************************************
 721  * ME_CalcRunExtent
 722  *
 723  * Updates the size of the run (fills width, ascent and descent). The height
 724  * is calculated based on whole row's ascent and descent anyway, so no need
 725  * to use it here.
 726  */
 727 void ME_CalcRunExtent(ME_Context *c, const ME_Paragraph *para, ME_Run *run)
 728 {
 729   if (run->nFlags & MERF_HIDDEN)
 730     run->nWidth = 0;
 731   else
 732   {
 733     int nEnd = ME_StrVLen(run->strText);
 734     SIZE size = ME_GetRunSizeCommon(c, para, run, nEnd, &run->nAscent, &run->nDescent);
 735     run->nWidth = size.cx;
 736     if (!size.cx)
 737       WARN("size.cx == 0\n");
 738   }
 739 }
 740
 741 /******************************************************************************
 742  * ME_MustBeWrapped
 743  *
 744  * This should ensure that the given paragraph is wrapped so that its screen
 745  * row structure may be used. But it doesn't, yet.
 746  */
 747 void ME_MustBeWrapped(ME_Context *c, ME_DisplayItem *para)
 748 {
 749   assert(para->type == diParagraph);
 750   /* FIXME */
 751 }
 752
 753 /******************************************************************************
 754  * ME_SetSelectionCharFormat
 755  *
 756  * Applies a style change, either to a current selection, or to insert cursor
 757  * (ie. the style next typed characters will use).
 758  */
 759 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 760 {
 761   int nFrom, nTo;
 762   ME_GetSelection(editor, &nFrom, &nTo);
 763   if (nFrom == nTo)
 764   {
 765     ME_Style *s;
 766     if (!editor->pBuffer->pCharStyle)
 767       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 768     s = ME_ApplyStyle(editor->pBuffer->pCharStyle, pFmt);
 769     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 770     editor->pBuffer->pCharStyle = s;
 771   }
 772   else
 773     ME_SetCharFormat(editor, nFrom, nTo-nFrom, pFmt);
 774 }
 775
 776 /******************************************************************************
 777  * ME_SetCharFormat
 778  *
 779  * Applies a style change to the specified part of the text
 780  */
 781 void ME_SetCharFormat(ME_TextEditor *editor, int nOfs, int nChars, CHARFORMAT2W *pFmt)
 782 {
 783   ME_Cursor tmp, tmp2;
 784   ME_DisplayItem *para;
 785
 786   ME_CursorFromCharOfs(editor, nOfs, &tmp);
 787   if (tmp.nOffset)
 788     tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
 789
 790   ME_CursorFromCharOfs(editor, nOfs+nChars, &tmp2);
 791   if (tmp2.nOffset)
 792     tmp2.pRun = ME_SplitRunSimple(editor, tmp2.pRun, tmp2.nOffset);
 793
 794   para = ME_GetParagraph(tmp.pRun);
 795   para->member.para.nFlags |= MEPF_REWRAP;
 796
 797   while(tmp.pRun != tmp2.pRun)
 798   {
 799     ME_UndoItem *undo = NULL;
 800     ME_Style *new_style = ME_ApplyStyle(tmp.pRun->member.run.style, pFmt);
 801     /* ME_DumpStyle(new_style); */
 802     undo = ME_AddUndoItem(editor, diUndoSetCharFormat, NULL);
 803     if (undo) {
 804       undo->nStart = tmp.pRun->member.run.nCharOfs+para->member.para.nCharOfs;
 805       undo->nLen = tmp.pRun->member.run.strText->nLen;
 806       undo->di.member.ustyle = tmp.pRun->member.run.style;
 807       /* we'd have to addref undo..ustyle and release tmp...style
 808          but they'd cancel each other out so we can do nothing instead */
 809     }
 810     else
 811       ME_ReleaseStyle(tmp.pRun->member.run.style);
 812     tmp.pRun->member.run.style = new_style;
 813     tmp.pRun = ME_FindItemFwd(tmp.pRun, diRunOrParagraph);
 814     if (tmp.pRun->type == diParagraph)
 815     {
 816       para = tmp.pRun;
 817       tmp.pRun = ME_FindItemFwd(tmp.pRun, diRun);
 818       if (tmp.pRun != tmp2.pRun)
 819         para->member.para.nFlags |= MEPF_REWRAP;
 820     }
 821     assert(tmp.pRun);
 822   }
 823 }
 824
 825 /******************************************************************************
 826  * ME_SetDefaultCharFormat
 827  *
 828  * Applies a style change to the default character style.
 829  */
 830 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 831 {
 832   ME_Style *style;
 833   ME_UndoItem *undo;
 834
 835   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 836   undo = ME_AddUndoItem(editor, diUndoSetDefaultCharFormat, NULL);
 837   if (undo) {
 838     undo->nStart = -1;
 839     undo->nLen = -1;
 840     undo->di.member.ustyle = editor->pBuffer->pDefaultStyle;
 841     ME_AddRefStyle(undo->di.member.ustyle);
 842   }
 843   style = ME_ApplyStyle(editor->pBuffer->pDefaultStyle, mod);
 844   editor->pBuffer->pDefaultStyle->fmt = style->fmt;
 845   editor->pBuffer->pDefaultStyle->tm = style->tm;
 846   ME_ReleaseStyle(style);
 847   ME_MarkAllForWrapping(editor);
 848   /*  pcf = editor->pBuffer->pDefaultStyle->fmt; */
 849 }
 850
 851 static void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 852 {
 853   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 854 }
 855
 856 /******************************************************************************
 857  * ME_GetDefaultCharFormat
 858  *
 859  * Retrieves the current default character style (the one applied where no
 860  * other style was applied) .
 861  */
 862 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 863 {
 864   int nFrom, nTo;
 865   ME_GetSelection(editor, &nFrom, &nTo);
 866   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 867 }
 868
 869 /******************************************************************************
 870  * ME_GetSelectionCharFormat
 871  *
 872  * If selection exists, it returns all style elements that are set consistently
 873  * in the whole selection. If not, it just returns the current style.
 874  */
 875 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 876 {
 877   int nFrom, nTo;
 878   ME_GetSelection(editor, &nFrom, &nTo);
 879   if (nFrom == nTo && editor->pBuffer->pCharStyle)
 880   {
 881     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 882     return;
 883   }
 884   ME_GetCharFormat(editor, nFrom, nTo, pFmt);
 885 }
 886
 887 /******************************************************************************
 888  * ME_GetCharFormat
 889  *
 890  * Returns the style consisting of those attributes which are consistently set
 891  * in the whole character range.
 892  */
 893 void ME_GetCharFormat(ME_TextEditor *editor, int nFrom, int nTo, CHARFORMAT2W *pFmt)
 894 {
 895   ME_DisplayItem *run, *run_end;
 896   int nOffset, nOffset2;
 897   CHARFORMAT2W tmp;
 898
 899   ME_RunOfsFromCharOfs(editor, nFrom, &run, &nOffset);
 900   if (nFrom == nTo) /* special case - if selection is empty, take previous char's formatting */
 901   {
 902     if (!nOffset)
 903     {
 904       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 905       if (tmp_run->type == diRun) {
 906         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 907         return;
 908       }
 909     }
 910     ME_GetRunCharFormat(editor, run, pFmt);
 911     return;
 912   }
 913
 914   if (nTo>nFrom) /* selection consists of chars from nFrom up to nTo-1 */
 915     nTo--;
 916   ME_RunOfsFromCharOfs(editor, nTo, &run_end, &nOffset2);
 917
 918   ME_GetRunCharFormat(editor, run, pFmt);
 919
 920   if (run == run_end) return;
 921
 922   do {
 923     /* FIXME add more style feature comparisons */
 924     int nAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_UNDERLINETYPE;
 925     int nEffects = CFM_BOLD | CFM_ITALIC;
 926
 927     run = ME_FindItemFwd(run, diRun);
 928
 929     ZeroMemory(&tmp, sizeof(tmp));
 930     tmp.cbSize = sizeof(tmp);
 931     ME_GetRunCharFormat(editor, run, &tmp);
 932
 933     assert((tmp.dwMask & nAttribs) == nAttribs);
 934     assert((tmp.dwMask & nEffects) == nEffects);
 935     /* reset flags that differ */
 936
 937     if (pFmt->yHeight != tmp.yHeight)
 938       pFmt->dwMask &= ~CFM_SIZE;
 939     if (pFmt->dwMask & CFM_FACE)
 940     {
 941       if (!(tmp.dwMask & CFM_FACE))
 942         pFmt->dwMask &= ~CFM_FACE;
 943       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName) ||
 944           pFmt->bPitchAndFamily != tmp.bPitchAndFamily)
 945         pFmt->dwMask &= ~CFM_FACE;
 946     }
 947     if (pFmt->yHeight != tmp.yHeight)
 948       pFmt->dwMask &= ~CFM_SIZE;
 949     if (pFmt->bUnderlineType != tmp.bUnderlineType)
 950       pFmt->dwMask &= ~CFM_UNDERLINETYPE;
 951     if (pFmt->dwMask & CFM_COLOR)
 952     {
 953       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 954       {
 955         if (pFmt->crTextColor != tmp.crTextColor)
 956           pFmt->dwMask &= ~CFM_COLOR;
 957       }
 958     }
 959
 960     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & nEffects);
 961
 962   } while(run != run_end);
 963 }