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           assert(p->member.run.nCR + p->member.run.nLF > 0);
 132           ofs += p->member.run.nCR + p->member.run.nLF;
 133         }
 134         else
 135           ofs += ME_StrLen(p->member.run.strText);
 136         break;
 137       default:
 138         assert(0);
 139     }
 140   } while(1);
 141 }
 142
 143 /******************************************************************************
 144  * ME_CharOfsFromRunOfs
 145  *
 146  * Converts a character position relative to the start of the run, to a
 147  * character position relative to the start of the document.
 148  * Kind of a "local to global" offset conversion.
 149  */
 150 int ME_CharOfsFromRunOfs(ME_TextEditor *editor, ME_DisplayItem *pRun, int nOfs)
 151 {
 152   ME_DisplayItem *pPara;
 153
 154   assert(pRun->type == diRun);
 155   assert(pRun->member.run.nCharOfs != -1);
 156
 157   pPara = ME_FindItemBack(pRun, diParagraph);
 158   assert(pPara);
 159   assert(pPara->type==diParagraph);
 160   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs
 161     + ME_VPosToPos(pRun->member.run.strText, nOfs);
 162 }
 163
 164 /******************************************************************************
 165  * ME_CursorFromCharOfs
 166  *
 167  * Converts a character offset (relative to the start of the document) to
 168  * a cursor structure (which contains a run and a position relative to that
 169  * run).
 170  */
 171 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 172 {
 173   ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pRun, &pCursor->nOffset);
 174 }
 175
 176 /******************************************************************************
 177  * ME_RunOfsFromCharOfs
 178  *
 179  * Find a run and relative character offset given an absolute character offset
 180  * (absolute offset being an offset relative to the start of the document).
 181  * Kind of a "global to local" offset conversion.
 182  */
 183 void ME_RunOfsFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem **ppRun, int *pOfs)
 184 {
 185   ME_DisplayItem *pPara;
 186   int nParaOfs;
 187
 188   pPara = editor->pBuffer->pFirst->member.para.next_para;
 189   assert(pPara);
 190   assert(ppRun);
 191   assert(pOfs);
 192   while (pPara->type == diParagraph)
 193   {
 194     nParaOfs = pPara->member.para.nCharOfs;
 195     assert(nCharOfs >= nParaOfs);
 196
 197     if (nCharOfs < pPara->member.para.next_para->member.para.nCharOfs)
 198     {
 199       int eollen = 1;
 200       *ppRun = ME_FindItemFwd(pPara, diRun);
 201       assert(*ppRun);
 202       while (!((*ppRun)->member.run.nFlags & MERF_ENDPARA))
 203       {
 204         ME_DisplayItem *pNext = ME_FindItemFwd(*ppRun, diRun);
 205         assert(pNext);
 206         assert(pNext->type == diRun);
 207         if (nCharOfs < nParaOfs + pNext->member.run.nCharOfs) {
 208           *pOfs = ME_PosToVPos((*ppRun)->member.run.strText,
 209             nCharOfs - nParaOfs - (*ppRun)->member.run.nCharOfs);
 210           return;
 211         }
 212         *ppRun = pNext;
 213       }
 214       /* Recover proper character length of this line break */
 215       eollen = (*ppRun)->member.run.nCR + (*ppRun)->member.run.nLF;
 216       if (nCharOfs >= nParaOfs + (*ppRun)->member.run.nCharOfs &&
 217         nCharOfs < nParaOfs + (*ppRun)->member.run.nCharOfs + eollen) {
 218         /* FIXME: Might cause problems when actually requiring an offset in the
 219            middle of a run that is considered a single line break */
 220         *pOfs = 0;
 221         return;
 222       }
 223     }
 224     pPara = pPara->member.para.next_para;
 225   }
 226   *ppRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 227   *pOfs = 0;
 228   assert((*ppRun)->member.run.nFlags & MERF_ENDPARA);
 229 }
 230
 231 /******************************************************************************
 232  * ME_JoinRuns
 233  *
 234  * Merges two adjacent runs, the one given as a parameter and the next one.
 235  */
 236 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 237 {
 238   ME_DisplayItem *pNext = p->next;
 239   int i;
 240   assert(p->type == diRun && pNext->type == diRun);
 241   assert(p->member.run.nCharOfs != -1);
 242   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 243
 244   /* if we were at the end of screen line, and the next run is in the new
 245          * line, then it's not the end of the line anymore */
 246         if (editor->bCaretAtEnd && editor->pCursors[0].pRun == pNext)
 247     editor->bCaretAtEnd = FALSE;
 248         /* Update all cursors so that they don't contain the soon deleted run */
 249   for (i=0; i<editor->nCursors; i++) {
 250     if (editor->pCursors[i].pRun == pNext) {
 251       editor->pCursors[i].pRun = p;
 252       editor->pCursors[i].nOffset += ME_StrVLen(p->member.run.strText);
 253     }
 254   }
 255
 256   ME_AppendString(p->member.run.strText, pNext->member.run.strText);
 257   ME_Remove(pNext);
 258   ME_DestroyDisplayItem(pNext);
 259   ME_UpdateRunFlags(editor, &p->member.run);
 260   if(TRACE_ON(richedit))
 261   {
 262     TRACE("Before check after join\n");
 263     ME_CheckCharOffsets(editor);
 264     TRACE("After check after join\n");
 265   }
 266 }
 267
 268 /******************************************************************************
 269  * ME_SplitRun
 270  *
 271  * Splits a run into two in a given place. It also updates the screen position
 272  * and size (extent) of the newly generated runs.
 273  */
 274 ME_DisplayItem *ME_SplitRun(ME_WrapContext *wc, ME_DisplayItem *item, int nVChar)
 275 {
 276   ME_TextEditor *editor = wc->context->editor;
 277   ME_DisplayItem *item2 = NULL;
 278   ME_Run *run, *run2;
 279   ME_Paragraph *para = &ME_GetParagraph(item)->member.para;
 280
 281   assert(item->member.run.nCharOfs != -1);
 282   if(TRACE_ON(richedit))
 283   {
 284     TRACE("Before check before split\n");
 285     ME_CheckCharOffsets(editor);
 286     TRACE("After check before split\n");
 287   }
 288
 289   run = &item->member.run;
 290
 291   TRACE("Before split: %s(%d, %d)\n", debugstr_w(run->strText->szData),
 292         run->pt.x, run->pt.y);
 293
 294   item2 = ME_SplitRunSimple(editor, item, nVChar);
 295
 296   run2 = &item2->member.run;
 297
 298   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
 299   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run2);
 300
 301   run2->pt.x = run->pt.x+run->nWidth;
 302   run2->pt.y = run->pt.y;
 303
 304   if(TRACE_ON(richedit))
 305   {
 306     TRACE("Before check after split\n");
 307     ME_CheckCharOffsets(editor);
 308     TRACE("After check after split\n");
 309     TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
 310       debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
 311       debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
 312   }
 313
 314   return item2;
 315 }
 316
 317 /******************************************************************************
 318  * ME_SplitRunSimple
 319  *
 320  * Does the most basic job of splitting a run into two - it does not
 321  * update the positions and extents.
 322  */
 323 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_DisplayItem *item, int nVChar)
 324 {
 325   ME_Run *run = &item->member.run;
 326   ME_DisplayItem *item2;
 327   ME_Run *run2;
 328   int i;
 329   assert(nVChar > 0 && nVChar < ME_StrVLen(run->strText));
 330   assert(item->type == diRun);
 331   assert(!(item->member.run.nFlags & MERF_NONTEXT));
 332   assert(item->member.run.nCharOfs != -1);
 333
 334   item2 = ME_MakeRun(run->style,
 335       ME_VSplitString(run->strText, nVChar), run->nFlags&MERF_SPLITMASK);
 336
 337   item2->member.run.nCharOfs = item->member.run.nCharOfs+
 338     ME_VPosToPos(item->member.run.strText, nVChar);
 339
 340   run2 = &item2->member.run;
 341   ME_InsertBefore(item->next, item2);
 342
 343   ME_UpdateRunFlags(editor, run);
 344   ME_UpdateRunFlags(editor, run2);
 345   for (i=0; i<editor->nCursors; i++) {
 346     if (editor->pCursors[i].pRun == item &&
 347         editor->pCursors[i].nOffset >= nVChar) {
 348       assert(item2->type == diRun);
 349       editor->pCursors[i].pRun = item2;
 350       editor->pCursors[i].nOffset -= nVChar;
 351     }
 352   }
 353   ME_GetParagraph(item)->member.para.nFlags |= MEPF_REWRAP;
 354   return item2;
 355 }
 356
 357 /******************************************************************************
 358  * ME_MakeRun
 359  *
 360  * A helper function to create run structures quickly.
 361  */
 362 ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
 363 {
 364   ME_DisplayItem *item = ME_MakeDI(diRun);
 365   item->member.run.style = s;
 366   item->member.run.ole_obj = NULL;
 367   item->member.run.strText = strData;
 368   item->member.run.nFlags = nFlags;
 369   item->member.run.nCharOfs = -1;
 370   ME_AddRefStyle(s);
 371   return item;
 372 }
 373
 374 /******************************************************************************
 375  * ME_InsertRun
 376  *
 377  * Inserts a run at a given character position (offset).
 378  */
 379 ME_DisplayItem *ME_InsertRun(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem *pItem)
 380 {
 381   ME_Cursor tmp;
 382   ME_DisplayItem *pDI;
 383
 384   assert(pItem->type == diRun || pItem->type == diUndoInsertRun);
 385
 386   ME_CursorFromCharOfs(editor, nCharOfs, &tmp);
 387   pDI = ME_InsertRunAtCursor(editor, &tmp, pItem->member.run.style,
 388                              pItem->member.run.strText->szData,
 389                              pItem->member.run.strText->nLen,
 390                              pItem->member.run.nFlags);
 391
 392   return pDI;
 393 }
 394
 395 /******************************************************************************
 396  * ME_InsertRunAtCursor
 397  *
 398  * Inserts a new run with given style, flags and content at a given position,
 399  * which is passed as a cursor structure (which consists of a run and
 400  * a run-relative character offset).
 401  */
 402 ME_DisplayItem *
 403 ME_InsertRunAtCursor(ME_TextEditor *editor, ME_Cursor *cursor, ME_Style *style,
 404                      const WCHAR *str, int len, int flags)
 405 {
 406   ME_DisplayItem *pDI;
 407   ME_UndoItem *pUI;
 408
 409   if (cursor->nOffset) {
 410         /* We're inserting at the middle of the existing run, which means that
 411                  * that run must be split. It isn't always necessary, but */
 412     cursor->pRun = ME_SplitRunSimple(editor, cursor->pRun, cursor->nOffset);
 413     cursor->nOffset = 0;
 414   }
 415
 416   pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
 417   if (pUI) {
 418     pUI->nStart = (ME_GetParagraph(cursor->pRun)->member.para.nCharOfs
 419                    + cursor->pRun->member.run.nCharOfs);
 420     pUI->nLen = len;
 421   }
 422
 423   pDI = ME_MakeRun(style, ME_MakeStringN(str, len), flags);
 424   pDI->member.run.nCharOfs = cursor->pRun->member.run.nCharOfs;
 425   ME_InsertBefore(cursor->pRun, pDI);
 426   TRACE("Shift length:%d\n", len);
 427   ME_PropagateCharOffset(cursor->pRun, len);
 428   ME_GetParagraph(cursor->pRun)->member.para.nFlags |= MEPF_REWRAP;
 429   return pDI;
 430 }
 431
 432 /******************************************************************************
 433  * ME_UpdateRunFlags
 434  *
 435  * Determine some of run attributes given its content (style, text content).
 436  * Some flags cannot be determined by this function (MERF_GRAPHICS,
 437  * MERF_ENDPARA)
 438  */
 439 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 440 {
 441   assert(run->nCharOfs != -1);
 442
 443   if (RUN_IS_HIDDEN(run))
 444     run->nFlags |= MERF_HIDDEN;
 445   else
 446     run->nFlags &= ~MERF_HIDDEN;
 447
 448   if (ME_IsSplitable(run->strText))
 449     run->nFlags |= MERF_SPLITTABLE;
 450   else
 451     run->nFlags &= ~MERF_SPLITTABLE;
 452
 453   if (!(run->nFlags & MERF_NOTEXT)) {
 454     if (ME_IsWhitespaces(run->strText))
 455       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 456     else
 457     {
 458       run->nFlags &= ~MERF_WHITESPACE;
 459
 460       if (ME_IsWSpace(ME_GetCharFwd(run->strText,0)))
 461         run->nFlags |= MERF_STARTWHITE;
 462       else
 463         run->nFlags &= ~MERF_STARTWHITE;
 464
 465       if (ME_IsWSpace(ME_GetCharBack(run->strText,0)))
 466         run->nFlags |= MERF_ENDWHITE;
 467       else
 468         run->nFlags &= ~MERF_ENDWHITE;
 469     }
 470   }
 471   else
 472     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 473 }
 474
 475 /******************************************************************************
 476  * ME_CharFromPoint
 477  *
 478  * Returns a character position inside the run given a run-relative
 479  * pixel horizontal position. This version rounds left (ie. if the second
 480  * character is at pixel position 8, then for cx=0..7 it returns 0).
 481  */
 482 int ME_CharFromPoint(ME_Context *c, int cx, ME_Run *run)
 483 {
 484   int fit = 0;
 485   HGDIOBJ hOldFont;
 486   SIZE sz;
 487   if (!run->strText->nLen)
 488     return 0;
 489
 490   if (run->nFlags & (MERF_TAB | MERF_CELL))
 491   {
 492     if (cx < run->nWidth/2)
 493       return 0;
 494     return 1;
 495   }
 496   if (run->nFlags & MERF_GRAPHICS)
 497   {
 498     SIZE sz;
 499     ME_GetOLEObjectSize(c, run, &sz);
 500     if (cx < sz.cx)
 501       return 0;
 502     return 1;
 503   }
 504   hOldFont = ME_SelectStyleFont(c, run->style);
 505
 506   if (c->editor->cPasswordMask)
 507   {
 508     ME_String *strMasked = ME_MakeStringR(c->editor->cPasswordMask,ME_StrVLen(run->strText));
 509     GetTextExtentExPointW(c->hDC, strMasked->szData, run->strText->nLen,
 510       cx, &fit, NULL, &sz);
 511     ME_DestroyString(strMasked);
 512   }
 513   else
 514   {
 515     GetTextExtentExPointW(c->hDC, run->strText->szData, run->strText->nLen,
 516       cx, &fit, NULL, &sz);
 517   }
 518
 519   ME_UnselectStyleFont(c, run->style, hOldFont);
 520
 521   return fit;
 522 }
 523
 524 /******************************************************************************
 525  * ME_CharFromPointCursor
 526  *
 527  * Returns a character position inside the run given a run-relative
 528  * pixel horizontal position. This version rounds to the nearest character edge
 529  * (ie. if the second character is at pixel position 8, then for cx=0..3
 530  * it returns 0, and for cx=4..7 it returns 1).
 531  *
 532  * It is used for mouse click handling, for better usability (and compatibility
 533  * with the native control).
 534  */
 535 int ME_CharFromPointCursor(ME_TextEditor *editor, int cx, ME_Run *run)
 536 {
 537   ME_String *strRunText;
 538   /* This could point to either the run's real text, or it's masked form in a password control */
 539
 540   int fit = 0, fit1 = 0;
 541   ME_Context c;
 542   HGDIOBJ hOldFont;
 543   SIZE sz, sz2, sz3;
 544   if (!run->strText->nLen)
 545     return 0;
 546
 547   if (run->nFlags & (MERF_TAB | MERF_CELL))
 548   {
 549     if (cx < run->nWidth/2)
 550       return 0;
 551     return 1;
 552   }
 553   ME_InitContext(&c, editor, GetDC(editor->hWnd));
 554   if (run->nFlags & MERF_GRAPHICS)
 555   {
 556     SIZE sz;
 557     ME_GetOLEObjectSize(&c, run, &sz);
 558     ME_DestroyContext(&c, editor->hWnd);
 559     if (cx < sz.cx/2)
 560       return 0;
 561     return 1;
 562   }
 563
 564   if (editor->cPasswordMask)
 565     strRunText = ME_MakeStringR(editor->cPasswordMask,ME_StrVLen(run->strText));
 566   else
 567     strRunText = run->strText;
 568
 569   hOldFont = ME_SelectStyleFont(&c, run->style);
 570   GetTextExtentExPointW(c.hDC, strRunText->szData, strRunText->nLen,
 571                         cx, &fit, NULL, &sz);
 572   if (fit != strRunText->nLen)
 573   {
 574     int chars = 1;
 575
 576     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit, &sz2);
 577     fit1 = ME_StrRelPos(strRunText, fit, &chars);
 578     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit1, &sz3);
 579     if (cx >= (sz2.cx+sz3.cx)/2)
 580       fit = fit1;
 581   }
 582
 583   if (editor->cPasswordMask)
 584     ME_DestroyString(strRunText);
 585
 586   ME_UnselectStyleFont(&c, run->style, hOldFont);
 587   ME_DestroyContext(&c, editor->hWnd);
 588   return fit;
 589 }
 590
 591 /******************************************************************************
 592  * ME_GetTextExtent
 593  *
 594  * Finds a width and a height of the text using a specified style
 595  */
 596 static void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s, SIZE *size)
 597 {
 598   HGDIOBJ hOldFont;
 599   hOldFont = ME_SelectStyleFont(c, s);
 600   GetTextExtentPoint32W(c->hDC, szText, nChars, size);
 601   ME_UnselectStyleFont(c, s, hOldFont);
 602 }
 603
 604 /******************************************************************************
 605  * ME_PointFromChar
 606  *
 607  * Returns a run-relative pixel position given a run-relative character
 608  * position (character offset)
 609  */
 610 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset)
 611 {
 612   SIZE size;
 613   ME_Context c;
 614   ME_String *strRunText;
 615   /* This could point to either the run's real text, or it's masked form in a password control */
 616
 617   ME_InitContext(&c, editor, GetDC(editor->hWnd));
 618   if (pRun->nFlags & MERF_GRAPHICS)
 619   {
 620     if (nOffset)
 621       ME_GetOLEObjectSize(&c, pRun, &size);
 622     ReleaseDC(editor->hWnd, c.hDC);
 623     return nOffset != 0;
 624   }
 625
 626    if (editor->cPasswordMask)
 627     strRunText = ME_MakeStringR(editor->cPasswordMask,ME_StrVLen(pRun->strText));
 628   else
 629     strRunText = pRun->strText;
 630
 631   ME_GetTextExtent(&c,  strRunText->szData, nOffset, pRun->style, &size);
 632   ReleaseDC(editor->hWnd, c.hDC);
 633   if (editor->cPasswordMask)
 634     ME_DestroyString(strRunText);
 635   return size.cx;
 636 }
 637
 638 /******************************************************************************
 639  * ME_GetRunSizeCommon
 640  *
 641  * Finds width, height, ascent and descent of a run, up to given character
 642  * (nLen).
 643  */
 644 static SIZE ME_GetRunSizeCommon(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen,
 645                                 int startx, int *pAscent, int *pDescent)
 646 {
 647   SIZE size;
 648   int nMaxLen = ME_StrVLen(run->strText);
 649
 650   if (nLen>nMaxLen)
 651     nLen = nMaxLen;
 652
 653   /* FIXME the following call also ensures that TEXTMETRIC structure is filled
 654    * this is wasteful for MERF_NONTEXT runs, but that shouldn't matter
 655    * in practice
 656    */
 657
 658   if (c->editor->cPasswordMask)
 659   {
 660     ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,nLen);
 661     ME_GetTextExtent(c, szMasked->szData, nLen,run->style, &size);
 662     ME_DestroyString(szMasked);
 663   }
 664   else
 665   {
 666     ME_GetTextExtent(c, run->strText->szData, nLen, run->style, &size);
 667   }
 668   *pAscent = run->style->tm.tmAscent;
 669   *pDescent = run->style->tm.tmDescent;
 670   size.cy = *pAscent + *pDescent;
 671
 672   if (run->nFlags & MERF_TAB)
 673   {
 674     int pos = 0, i = 0, ppos;
 675     PARAFORMAT2 *pFmt = para->pFmt;
 676
 677     do {
 678       if (i < pFmt->cTabCount)
 679       {
 680         pos = pFmt->rgxTabs[i]&0x00FFFFFF;
 681         i++;
 682       }
 683       else
 684       {
 685         pos += 720-(pos%720);
 686       }
 687       ppos = ME_twips2pointsX(c, pos);
 688       if (ppos > startx + run->pt.x) {
 689         size.cx = ppos - startx - run->pt.x;
 690         break;
 691       }
 692     } while(1);
 693     size.cy = *pAscent + *pDescent;
 694     return size;
 695   }
 696   if (run->nFlags & MERF_GRAPHICS)
 697   {
 698     ME_GetOLEObjectSize(c, run, &size);
 699     if (size.cy > *pAscent)
 700       *pAscent = size.cy;
 701     /* descent is unchanged */
 702     return size;
 703   }
 704   if (run->nFlags & MERF_CELL)
 705   {
 706     size.cx = ME_twips2pointsX(c, run->pCell->nRightBoundary) - run->pt.x;
 707     return size;
 708   }
 709   return size;
 710 }
 711
 712 /******************************************************************************
 713  * ME_GetRunSize
 714  *
 715  * Finds width and height (but not ascent and descent) of a part of the run
 716  * up to given character.
 717  */
 718 SIZE ME_GetRunSize(ME_Context *c, const ME_Paragraph *para,
 719                    ME_Run *run, int nLen, int startx)
 720 {
 721   int asc, desc;
 722   return ME_GetRunSizeCommon(c, para, run, nLen, startx, &asc, &desc);
 723 }
 724
 725 /******************************************************************************
 726  * ME_CalcRunExtent
 727  *
 728  * Updates the size of the run (fills width, ascent and descent). The height
 729  * is calculated based on whole row's ascent and descent anyway, so no need
 730  * to use it here.
 731  */
 732 void ME_CalcRunExtent(ME_Context *c, const ME_Paragraph *para, int startx, ME_Run *run)
 733 {
 734   if (run->nFlags & MERF_HIDDEN)
 735     run->nWidth = 0;
 736   else
 737   {
 738     int nEnd = ME_StrVLen(run->strText);
 739     SIZE size = ME_GetRunSizeCommon(c, para, run, nEnd, startx,
 740                                     &run->nAscent, &run->nDescent);
 741     run->nWidth = size.cx;
 742     if (!size.cx)
 743       WARN("size.cx == 0\n");
 744   }
 745 }
 746
 747 /******************************************************************************
 748  * ME_MustBeWrapped
 749  *
 750  * This should ensure that the given paragraph is wrapped so that its screen
 751  * row structure may be used. But it doesn't, yet.
 752  */
 753 void ME_MustBeWrapped(ME_Context *c, ME_DisplayItem *para)
 754 {
 755   assert(para->type == diParagraph);
 756   /* FIXME */
 757 }
 758
 759 /******************************************************************************
 760  * ME_SetSelectionCharFormat
 761  *
 762  * Applies a style change, either to a current selection, or to insert cursor
 763  * (ie. the style next typed characters will use).
 764  */
 765 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 766 {
 767   int nFrom, nTo;
 768   ME_GetSelection(editor, &nFrom, &nTo);
 769   if (nFrom == nTo)
 770   {
 771     ME_Style *s;
 772     if (!editor->pBuffer->pCharStyle)
 773       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 774     s = ME_ApplyStyle(editor->pBuffer->pCharStyle, pFmt);
 775     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 776     editor->pBuffer->pCharStyle = s;
 777   }
 778   else
 779     ME_SetCharFormat(editor, nFrom, nTo-nFrom, pFmt);
 780 }
 781
 782 /******************************************************************************
 783  * ME_SetCharFormat
 784  *
 785  * Applies a style change to the specified part of the text
 786  */
 787 void ME_SetCharFormat(ME_TextEditor *editor, int nOfs, int nChars, CHARFORMAT2W *pFmt)
 788 {
 789   ME_Cursor tmp, tmp2;
 790   ME_DisplayItem *para;
 791
 792   ME_CursorFromCharOfs(editor, nOfs, &tmp);
 793   if (tmp.nOffset)
 794     tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
 795
 796   ME_CursorFromCharOfs(editor, nOfs+nChars, &tmp2);
 797   if (tmp2.nOffset)
 798     tmp2.pRun = ME_SplitRunSimple(editor, tmp2.pRun, tmp2.nOffset);
 799
 800   para = ME_GetParagraph(tmp.pRun);
 801   para->member.para.nFlags |= MEPF_REWRAP;
 802
 803   while(tmp.pRun != tmp2.pRun)
 804   {
 805     ME_UndoItem *undo = NULL;
 806     ME_Style *new_style = ME_ApplyStyle(tmp.pRun->member.run.style, pFmt);
 807     /* ME_DumpStyle(new_style); */
 808     undo = ME_AddUndoItem(editor, diUndoSetCharFormat, NULL);
 809     if (undo) {
 810       undo->nStart = tmp.pRun->member.run.nCharOfs+para->member.para.nCharOfs;
 811       undo->nLen = tmp.pRun->member.run.strText->nLen;
 812       undo->di.member.ustyle = tmp.pRun->member.run.style;
 813       /* we'd have to addref undo..ustyle and release tmp...style
 814          but they'd cancel each other out so we can do nothing instead */
 815     }
 816     else
 817       ME_ReleaseStyle(tmp.pRun->member.run.style);
 818     tmp.pRun->member.run.style = new_style;
 819     tmp.pRun = ME_FindItemFwd(tmp.pRun, diRunOrParagraph);
 820     if (tmp.pRun->type == diParagraph)
 821     {
 822       para = tmp.pRun;
 823       tmp.pRun = ME_FindItemFwd(tmp.pRun, diRun);
 824       if (tmp.pRun != tmp2.pRun)
 825         para->member.para.nFlags |= MEPF_REWRAP;
 826     }
 827     assert(tmp.pRun);
 828   }
 829 }
 830
 831 /******************************************************************************
 832  * ME_SetDefaultCharFormat
 833  *
 834  * Applies a style change to the default character style.
 835  */
 836 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 837 {
 838   ME_Style *style;
 839   ME_UndoItem *undo;
 840
 841   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 842   undo = ME_AddUndoItem(editor, diUndoSetDefaultCharFormat, NULL);
 843   if (undo) {
 844     undo->nStart = -1;
 845     undo->nLen = -1;
 846     undo->di.member.ustyle = editor->pBuffer->pDefaultStyle;
 847     ME_AddRefStyle(undo->di.member.ustyle);
 848   }
 849   style = ME_ApplyStyle(editor->pBuffer->pDefaultStyle, mod);
 850   editor->pBuffer->pDefaultStyle->fmt = style->fmt;
 851   editor->pBuffer->pDefaultStyle->tm = style->tm;
 852   ME_ReleaseStyle(style);
 853   ME_MarkAllForWrapping(editor);
 854   /*  pcf = editor->pBuffer->pDefaultStyle->fmt; */
 855 }
 856
 857 static void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 858 {
 859   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 860 }
 861
 862 /******************************************************************************
 863  * ME_GetDefaultCharFormat
 864  *
 865  * Retrieves the current default character style (the one applied where no
 866  * other style was applied) .
 867  */
 868 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 869 {
 870   int nFrom, nTo;
 871   ME_GetSelection(editor, &nFrom, &nTo);
 872   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 873 }
 874
 875 /******************************************************************************
 876  * ME_GetSelectionCharFormat
 877  *
 878  * If selection exists, it returns all style elements that are set consistently
 879  * in the whole selection. If not, it just returns the current style.
 880  */
 881 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 882 {
 883   int nFrom, nTo;
 884   ME_GetSelection(editor, &nFrom, &nTo);
 885   if (nFrom == nTo && editor->pBuffer->pCharStyle)
 886   {
 887     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 888     return;
 889   }
 890   ME_GetCharFormat(editor, nFrom, nTo, pFmt);
 891 }
 892
 893 /******************************************************************************
 894  * ME_GetCharFormat
 895  *
 896  * Returns the style consisting of those attributes which are consistently set
 897  * in the whole character range.
 898  */
 899 void ME_GetCharFormat(ME_TextEditor *editor, int nFrom, int nTo, CHARFORMAT2W *pFmt)
 900 {
 901   ME_DisplayItem *run, *run_end;
 902   int nOffset, nOffset2;
 903   CHARFORMAT2W tmp;
 904
 905   ME_RunOfsFromCharOfs(editor, nFrom, &run, &nOffset);
 906   if (nFrom == nTo) /* special case - if selection is empty, take previous char's formatting */
 907   {
 908     if (!nOffset)
 909     {
 910       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 911       if (tmp_run->type == diRun) {
 912         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 913         return;
 914       }
 915     }
 916     ME_GetRunCharFormat(editor, run, pFmt);
 917     return;
 918   }
 919
 920   if (nTo>nFrom) /* selection consists of chars from nFrom up to nTo-1 */
 921     nTo--;
 922   ME_RunOfsFromCharOfs(editor, nTo, &run_end, &nOffset2);
 923
 924   ME_GetRunCharFormat(editor, run, pFmt);
 925
 926   if (run == run_end) return;
 927
 928   do {
 929     /* FIXME add more style feature comparisons */
 930     int nAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_UNDERLINETYPE;
 931     int nEffects = CFM_BOLD | CFM_ITALIC;
 932
 933     run = ME_FindItemFwd(run, diRun);
 934
 935     ZeroMemory(&tmp, sizeof(tmp));
 936     tmp.cbSize = sizeof(tmp);
 937     ME_GetRunCharFormat(editor, run, &tmp);
 938
 939     assert((tmp.dwMask & nAttribs) == nAttribs);
 940     assert((tmp.dwMask & nEffects) == nEffects);
 941     /* reset flags that differ */
 942
 943     if (pFmt->yHeight != tmp.yHeight)
 944       pFmt->dwMask &= ~CFM_SIZE;
 945     if (pFmt->dwMask & CFM_FACE)
 946     {
 947       if (!(tmp.dwMask & CFM_FACE))
 948         pFmt->dwMask &= ~CFM_FACE;
 949       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName) ||
 950           pFmt->bPitchAndFamily != tmp.bPitchAndFamily)
 951         pFmt->dwMask &= ~CFM_FACE;
 952     }
 953     if (pFmt->yHeight != tmp.yHeight)
 954       pFmt->dwMask &= ~CFM_SIZE;
 955     if (pFmt->bUnderlineType != tmp.bUnderlineType)
 956       pFmt->dwMask &= ~CFM_UNDERLINETYPE;
 957     if (pFmt->dwMask & CFM_COLOR)
 958     {
 959       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 960       {
 961         if (pFmt->crTextColor != tmp.crTextColor)
 962           pFmt->dwMask &= ~CFM_COLOR;
 963       }
 964     }
 965
 966     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & nEffects);
 967
 968   } while(run != run_end);
 969 }