dll/win32/riched20/run.c

   1 /*
   2  * RichEdit - operations on runs (diRun, rectangular pieces of paragraphs).
   3  * Splitting/joining runs. Adjusting offsets after deleting/adding content.
   4  * Character/pixel conversions.
   5  *
   6  * Copyright 2004 by Krzysztof Foltman
   7  * Copyright 2006 by Phil Krylov
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 #include "editor.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  27 WINE_DECLARE_DEBUG_CHANNEL(richedit_check);
  28 WINE_DECLARE_DEBUG_CHANNEL(richedit_lists);
  29
  30 /******************************************************************************
  31  * ME_CanJoinRuns
  32  *
  33  * Returns 1 if two runs can be safely merged into one, 0 otherwise.
  34  */
  35 int ME_CanJoinRuns(const ME_Run *run1, const ME_Run *run2)
  36 {
  37   if ((run1->nFlags | run2->nFlags) & MERF_NOJOIN)
  38     return 0;
  39   if (run1->style != run2->style)
  40     return 0;
  41   if ((run1->nFlags & MERF_STYLEFLAGS) != (run2->nFlags & MERF_STYLEFLAGS))
  42     return 0;
  43   return 1;
  44 }
  45
  46 void ME_SkipAndPropagateCharOffset(ME_DisplayItem *p, int shift)
  47 {
  48   p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  49   assert(p);
  50   ME_PropagateCharOffset(p, shift);
  51 }
  52
  53 /******************************************************************************
  54  * ME_PropagateCharOffsets
  55  *
  56  * Shifts (increases or decreases) character offset (relative to beginning of
  57  * the document) of the part of the text starting from given place.
  58  */
  59 void ME_PropagateCharOffset(ME_DisplayItem *p, int shift)
  60 {
  61         /* Runs in one paragraph contain character offset relative to their owning
  62          * paragraph. If we start the shifting from the run, we need to shift
  63          * all the relative offsets until the end of the paragraph
  64          */
  65   if (p->type == diRun) /* propagate in all runs in this para */
  66   {
  67     TRACE("PropagateCharOffset(%s, %d)\n", debugstr_w(p->member.run.strText->szData), shift);
  68     do {
  69       p->member.run.nCharOfs += shift;
  70       assert(p->member.run.nCharOfs >= 0);
  71       p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  72     } while(p->type == diRun);
  73   }
  74         /* Runs in next paragraphs don't need their offsets updated, because they,
  75          * again, those offsets are relative to their respective paragraphs.
  76          * Instead of that, we're updating paragraphs' character offsets.
  77          */
  78   if (p->type == diParagraph) /* propagate in all next paras */
  79   {
  80     do {
  81       p->member.para.nCharOfs += shift;
  82       assert(p->member.para.nCharOfs >= 0);
  83       p = p->member.para.next_para;
  84     } while(p->type == diParagraph);
  85   }
  86   /* diTextEnd also has character offset in it, which makes finding text length
  87    * easier. But it needs to be up to date first.
  88    */
  89   if (p->type == diTextEnd)
  90   {
  91     p->member.para.nCharOfs += shift;
  92     assert(p->member.para.nCharOfs >= 0);
  93   }
  94 }
  95
  96 /******************************************************************************
  97  * ME_CheckCharOffsets
  98  *
  99  * Checks if editor lists' validity and optionally dumps the document structure
 100  */
 101 void ME_CheckCharOffsets(ME_TextEditor *editor)
 102 {
 103   ME_DisplayItem *p = editor->pBuffer->pFirst;
 104   int ofs = 0, ofsp = 0;
 105   if(TRACE_ON(richedit_lists))
 106   {
 107     TRACE_(richedit_lists)("---\n");
 108     ME_DumpDocument(editor->pBuffer);
 109   }
 110   do {
 111     p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
 112     switch(p->type) {
 113       case diTextEnd:
 114         TRACE_(richedit_check)("tend, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
 115         assert(ofsp+ofs == p->member.para.nCharOfs);
 116         return;
 117       case diParagraph:
 118         TRACE_(richedit_check)("para, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
 119         assert(ofsp+ofs == p->member.para.nCharOfs);
 120         ofsp = p->member.para.nCharOfs;
 121         ofs = 0;
 122         break;
 123       case diRun:
 124         TRACE_(richedit_check)("run, real ofs = %d (+ofsp = %d), counted = %d, len = %d, txt = \"%s\", flags=%08x, fx&mask = %08x\n",
 125           p->member.run.nCharOfs, p->member.run.nCharOfs+ofsp, ofsp+ofs,
 126           p->member.run.strText->nLen, debugstr_w(p->member.run.strText->szData),
 127           p->member.run.nFlags,
 128           p->member.run.style->fmt.dwMask & p->member.run.style->fmt.dwEffects);
 129         assert(ofs == p->member.run.nCharOfs);
 130         assert(p->member.run.strText->nLen);
 131         ofs += p->member.run.strText->nLen;
 132         break;
 133       case diCell:
 134         TRACE_(richedit_check)("cell\n");
 135         break;
 136       default:
 137         assert(0);
 138     }
 139   } while(1);
 140 }
 141
 142 /******************************************************************************
 143  * ME_CharOfsFromRunOfs
 144  *
 145  * Converts a character position relative to the start of the run, to a
 146  * character position relative to the start of the document.
 147  * Kind of a "local to global" offset conversion.
 148  */
 149 int ME_CharOfsFromRunOfs(ME_TextEditor *editor, const ME_DisplayItem *pPara,
 150                          const ME_DisplayItem *pRun, int nOfs)
 151 {
 152   assert(pRun && pRun->type == diRun);
 153   assert(pPara && pPara->type == diParagraph);
 154   return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs + nOfs;
 155 }
 156
 157 /******************************************************************************
 158  * ME_CursorFromCharOfs
 159  *
 160  * Converts a character offset (relative to the start of the document) to
 161  * a cursor structure (which contains a run and a position relative to that
 162  * run).
 163  */
 164 void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
 165 {
 166   ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pPara,
 167                        &pCursor->pRun, &pCursor->nOffset);
 168 }
 169
 170 /******************************************************************************
 171  * ME_RunOfsFromCharOfs
 172  *
 173  * Find a run and relative character offset given an absolute character offset
 174  * (absolute offset being an offset relative to the start of the document).
 175  * Kind of a "global to local" offset conversion.
 176  */
 177 void ME_RunOfsFromCharOfs(ME_TextEditor *editor,
 178                           int nCharOfs,
 179                           ME_DisplayItem **ppPara,
 180                           ME_DisplayItem **ppRun,
 181                           int *pOfs)
 182 {
 183   ME_DisplayItem *item, *next_item;
 184
 185   nCharOfs = max(nCharOfs, 0);
 186   nCharOfs = min(nCharOfs, ME_GetTextLength(editor));
 187
 188   /* Find the paragraph at the offset. */
 189   next_item = editor->pBuffer->pFirst->member.para.next_para;
 190   do {
 191     item = next_item;
 192     next_item = item->member.para.next_para;
 193   } while (next_item->member.para.nCharOfs <= nCharOfs);
 194   assert(item->type == diParagraph);
 195   nCharOfs -= item->member.para.nCharOfs;
 196   if (ppPara) *ppPara = item;
 197
 198   /* Find the run at the offset. */
 199   next_item = ME_FindItemFwd(item, diRun);
 200   do {
 201     item = next_item;
 202     next_item = ME_FindItemFwd(item, diRunOrParagraphOrEnd);
 203   } while (next_item->type == diRun &&
 204            next_item->member.run.nCharOfs <= nCharOfs);
 205   assert(item->type == diRun);
 206   nCharOfs -= item->member.run.nCharOfs;
 207
 208   if (ppRun) *ppRun = item;
 209   if (pOfs) *pOfs = nCharOfs;
 210 }
 211
 212 /******************************************************************************
 213  * ME_JoinRuns
 214  *
 215  * Merges two adjacent runs, the one given as a parameter and the next one.
 216  */
 217 void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
 218 {
 219   ME_DisplayItem *pNext = p->next;
 220   int i;
 221   assert(p->type == diRun && pNext->type == diRun);
 222   assert(p->member.run.nCharOfs != -1);
 223   ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;
 224
 225   /* Update all cursors so that they don't contain the soon deleted run */
 226   for (i=0; i<editor->nCursors; i++) {
 227     if (editor->pCursors[i].pRun == pNext) {
 228       editor->pCursors[i].pRun = p;
 229       editor->pCursors[i].nOffset += p->member.run.strText->nLen;
 230     }
 231   }
 232
 233   ME_AppendString(p->member.run.strText, pNext->member.run.strText);
 234   ME_Remove(pNext);
 235   ME_DestroyDisplayItem(pNext);
 236   ME_UpdateRunFlags(editor, &p->member.run);
 237   if(TRACE_ON(richedit))
 238   {
 239     TRACE("Before check after join\n");
 240     ME_CheckCharOffsets(editor);
 241     TRACE("After check after join\n");
 242   }
 243 }
 244
 245 /******************************************************************************
 246  * ME_SplitRun
 247  *
 248  * Splits a run into two in a given place. It also updates the screen position
 249  * and size (extent) of the newly generated runs.
 250  */
 251 ME_DisplayItem *ME_SplitRun(ME_WrapContext *wc, ME_DisplayItem *item, int nVChar)
 252 {
 253   ME_TextEditor *editor = wc->context->editor;
 254   ME_DisplayItem *item2 = NULL;
 255   ME_Run *run, *run2;
 256   ME_Paragraph *para = &ME_GetParagraph(item)->member.para;
 257
 258   assert(item->member.run.nCharOfs != -1);
 259   if(TRACE_ON(richedit))
 260   {
 261     TRACE("Before check before split\n");
 262     ME_CheckCharOffsets(editor);
 263     TRACE("After check before split\n");
 264   }
 265
 266   run = &item->member.run;
 267
 268   TRACE("Before split: %s(%d, %d)\n", debugstr_w(run->strText->szData),
 269         run->pt.x, run->pt.y);
 270
 271   item2 = ME_SplitRunSimple(editor, item, nVChar);
 272
 273   run2 = &item2->member.run;
 274
 275   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
 276   ME_CalcRunExtent(wc->context, para, wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run2);
 277
 278   run2->pt.x = run->pt.x+run->nWidth;
 279   run2->pt.y = run->pt.y;
 280
 281   if(TRACE_ON(richedit))
 282   {
 283     TRACE("Before check after split\n");
 284     ME_CheckCharOffsets(editor);
 285     TRACE("After check after split\n");
 286     TRACE("After split: %s(%d, %d), %s(%d, %d)\n",
 287       debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
 288       debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
 289   }
 290
 291   return item2;
 292 }
 293
 294 /******************************************************************************
 295  * ME_SplitRunSimple
 296  *
 297  * Does the most basic job of splitting a run into two - it does not
 298  * update the positions and extents.
 299  */
 300 ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_DisplayItem *item, int nVChar)
 301 {
 302   ME_Run *run = &item->member.run;
 303   ME_DisplayItem *item2;
 304   ME_Run *run2;
 305   int i;
 306   assert(nVChar > 0 && nVChar < run->strText->nLen);
 307   assert(item->type == diRun);
 308   assert(!(item->member.run.nFlags & MERF_NONTEXT));
 309   assert(item->member.run.nCharOfs != -1);
 310
 311   item2 = ME_MakeRun(run->style,
 312       ME_VSplitString(run->strText, nVChar), run->nFlags&MERF_SPLITMASK);
 313
 314   item2->member.run.nCharOfs = item->member.run.nCharOfs + nVChar;
 315
 316   run2 = &item2->member.run;
 317   ME_InsertBefore(item->next, item2);
 318
 319   ME_UpdateRunFlags(editor, run);
 320   ME_UpdateRunFlags(editor, run2);
 321   for (i=0; i<editor->nCursors; i++) {
 322     if (editor->pCursors[i].pRun == item &&
 323         editor->pCursors[i].nOffset >= nVChar) {
 324       assert(item2->type == diRun);
 325       editor->pCursors[i].pRun = item2;
 326       editor->pCursors[i].nOffset -= nVChar;
 327     }
 328   }
 329   ME_GetParagraph(item)->member.para.nFlags |= MEPF_REWRAP;
 330   return item2;
 331 }
 332
 333 /******************************************************************************
 334  * ME_MakeRun
 335  *
 336  * A helper function to create run structures quickly.
 337  */
 338 ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
 339 {
 340   ME_DisplayItem *item = ME_MakeDI(diRun);
 341   item->member.run.style = s;
 342   item->member.run.ole_obj = NULL;
 343   item->member.run.strText = strData;
 344   item->member.run.nFlags = nFlags;
 345   item->member.run.nCharOfs = -1;
 346   ME_AddRefStyle(s);
 347   return item;
 348 }
 349
 350 /******************************************************************************
 351  * ME_InsertRun
 352  *
 353  * Inserts a run at a given character position (offset).
 354  */
 355 ME_DisplayItem *ME_InsertRun(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem *pItem)
 356 {
 357   ME_Cursor tmp;
 358   ME_DisplayItem *pDI;
 359
 360   assert(pItem->type == diRun || pItem->type == diUndoInsertRun);
 361
 362   ME_CursorFromCharOfs(editor, nCharOfs, &tmp);
 363   pDI = ME_InsertRunAtCursor(editor, &tmp, pItem->member.run.style,
 364                              pItem->member.run.strText->szData,
 365                              pItem->member.run.strText->nLen,
 366                              pItem->member.run.nFlags);
 367
 368   return pDI;
 369 }
 370
 371 /******************************************************************************
 372  * ME_InsertRunAtCursor
 373  *
 374  * Inserts a new run with given style, flags and content at a given position,
 375  * which is passed as a cursor structure (which consists of a run and
 376  * a run-relative character offset).
 377  */
 378 ME_DisplayItem *
 379 ME_InsertRunAtCursor(ME_TextEditor *editor, ME_Cursor *cursor, ME_Style *style,
 380                      const WCHAR *str, int len, int flags)
 381 {
 382   ME_DisplayItem *pDI;
 383   ME_UndoItem *pUI;
 384
 385   if (cursor->nOffset) {
 386         /* We're inserting at the middle of the existing run, which means that
 387                  * that run must be split. It isn't always necessary, but */
 388     cursor->pRun = ME_SplitRunSimple(editor, cursor->pRun, cursor->nOffset);
 389     cursor->nOffset = 0;
 390   }
 391
 392   pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
 393   if (pUI) {
 394     pUI->nStart = cursor->pPara->member.para.nCharOfs
 395                   + cursor->pRun->member.run.nCharOfs;
 396     pUI->nLen = len;
 397   }
 398
 399   pDI = ME_MakeRun(style, ME_MakeStringN(str, len), flags);
 400   pDI->member.run.nCharOfs = cursor->pRun->member.run.nCharOfs;
 401   ME_InsertBefore(cursor->pRun, pDI);
 402   TRACE("Shift length:%d\n", len);
 403   ME_PropagateCharOffset(cursor->pRun, len);
 404   cursor->pPara->member.para.nFlags |= MEPF_REWRAP;
 405   return pDI;
 406 }
 407
 408 /******************************************************************************
 409  * ME_UpdateRunFlags
 410  *
 411  * Determine some of run attributes given its content (style, text content).
 412  * Some flags cannot be determined by this function (MERF_GRAPHICS,
 413  * MERF_ENDPARA)
 414  */
 415 void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
 416 {
 417   ME_String *strText = run->strText;
 418   assert(run->nCharOfs >= 0);
 419
 420   if (RUN_IS_HIDDEN(run) || run->nFlags & MERF_TABLESTART)
 421     run->nFlags |= MERF_HIDDEN;
 422   else
 423     run->nFlags &= ~MERF_HIDDEN;
 424
 425   if (ME_IsSplitable(strText))
 426     run->nFlags |= MERF_SPLITTABLE;
 427   else
 428     run->nFlags &= ~MERF_SPLITTABLE;
 429
 430   if (!(run->nFlags & MERF_NOTEXT)) {
 431     if (ME_IsWhitespaces(strText))
 432       run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
 433     else
 434     {
 435       run->nFlags &= ~MERF_WHITESPACE;
 436
 437       if (ME_IsWSpace(strText->szData[0]))
 438         run->nFlags |= MERF_STARTWHITE;
 439       else
 440         run->nFlags &= ~MERF_STARTWHITE;
 441
 442       if (ME_IsWSpace(strText->szData[strText->nLen - 1]))
 443         run->nFlags |= MERF_ENDWHITE;
 444       else
 445         run->nFlags &= ~MERF_ENDWHITE;
 446     }
 447   }
 448   else
 449     run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
 450 }
 451
 452 /******************************************************************************
 453  * ME_CharFromPoint
 454  *
 455  * Returns a character position inside the run given a run-relative
 456  * pixel horizontal position. This version rounds left (ie. if the second
 457  * character is at pixel position 8, then for cx=0..7 it returns 0).
 458  */
 459 int ME_CharFromPoint(ME_Context *c, int cx, ME_Run *run)
 460 {
 461   int fit = 0;
 462   HGDIOBJ hOldFont;
 463   SIZE sz;
 464   if (!run->strText->nLen)
 465     return 0;
 466
 467   if (run->nFlags & MERF_TAB ||
 468       (run->nFlags & (MERF_ENDCELL|MERF_ENDPARA)) == MERF_ENDCELL)
 469   {
 470     if (cx < run->nWidth/2)
 471       return 0;
 472     return 1;
 473   }
 474   if (run->nFlags & MERF_GRAPHICS)
 475   {
 476     SIZE sz;
 477     ME_GetOLEObjectSize(c, run, &sz);
 478     if (cx < sz.cx)
 479       return 0;
 480     return 1;
 481   }
 482   hOldFont = ME_SelectStyleFont(c, run->style);
 483
 484   if (c->editor->cPasswordMask)
 485   {
 486     ME_String *strMasked = ME_MakeStringR(c->editor->cPasswordMask, run->strText->nLen);
 487     GetTextExtentExPointW(c->hDC, strMasked->szData, run->strText->nLen,
 488       cx, &fit, NULL, &sz);
 489     ME_DestroyString(strMasked);
 490   }
 491   else
 492   {
 493     GetTextExtentExPointW(c->hDC, run->strText->szData, run->strText->nLen,
 494       cx, &fit, NULL, &sz);
 495   }
 496
 497   ME_UnselectStyleFont(c, run->style, hOldFont);
 498
 499   return fit;
 500 }
 501
 502 /******************************************************************************
 503  * ME_CharFromPointCursor
 504  *
 505  * Returns a character position inside the run given a run-relative
 506  * pixel horizontal position. This version rounds to the nearest character edge
 507  * (ie. if the second character is at pixel position 8, then for cx=0..3
 508  * it returns 0, and for cx=4..7 it returns 1).
 509  *
 510  * It is used for mouse click handling, for better usability (and compatibility
 511  * with the native control).
 512  */
 513 int ME_CharFromPointCursor(ME_TextEditor *editor, int cx, ME_Run *run)
 514 {
 515   ME_String *strRunText;
 516   /* This could point to either the run's real text, or it's masked form in a password control */
 517
 518   int fit = 0;
 519   ME_Context c;
 520   HGDIOBJ hOldFont;
 521   SIZE sz, sz2, sz3;
 522   if (!run->strText->nLen)
 523     return 0;
 524
 525   if (run->nFlags & (MERF_TAB | MERF_ENDCELL))
 526   {
 527     if (cx < run->nWidth/2)
 528       return 0;
 529     return 1;
 530   }
 531   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 532   if (run->nFlags & MERF_GRAPHICS)
 533   {
 534     SIZE sz;
 535     ME_GetOLEObjectSize(&c, run, &sz);
 536     ME_DestroyContext(&c);
 537     if (cx < sz.cx/2)
 538       return 0;
 539     return 1;
 540   }
 541
 542   if (editor->cPasswordMask)
 543     strRunText = ME_MakeStringR(editor->cPasswordMask, run->strText->nLen);
 544   else
 545     strRunText = run->strText;
 546
 547   hOldFont = ME_SelectStyleFont(&c, run->style);
 548   GetTextExtentExPointW(c.hDC, strRunText->szData, strRunText->nLen,
 549                         cx, &fit, NULL, &sz);
 550   if (fit != strRunText->nLen)
 551   {
 552     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit, &sz2);
 553     GetTextExtentPoint32W(c.hDC, strRunText->szData, fit + 1, &sz3);
 554     if (cx >= (sz2.cx+sz3.cx)/2)
 555       fit = fit + 1;
 556   }
 557
 558   if (editor->cPasswordMask)
 559     ME_DestroyString(strRunText);
 560
 561   ME_UnselectStyleFont(&c, run->style, hOldFont);
 562   ME_DestroyContext(&c);
 563   return fit;
 564 }
 565
 566 /******************************************************************************
 567  * ME_GetTextExtent
 568  *
 569  * Finds a width and a height of the text using a specified style
 570  */
 571 static void ME_GetTextExtent(ME_Context *c, LPCWSTR szText, int nChars, ME_Style *s, SIZE *size)
 572 {
 573   HGDIOBJ hOldFont;
 574   hOldFont = ME_SelectStyleFont(c, s);
 575   GetTextExtentPoint32W(c->hDC, szText, nChars, size);
 576   ME_UnselectStyleFont(c, s, hOldFont);
 577 }
 578
 579 /******************************************************************************
 580  * ME_PointFromChar
 581  *
 582  * Returns a run-relative pixel position given a run-relative character
 583  * position (character offset)
 584  */
 585 int ME_PointFromChar(ME_TextEditor *editor, ME_Run *pRun, int nOffset)
 586 {
 587   SIZE size;
 588   ME_Context c;
 589   ME_String *strRunText;
 590   /* This could point to either the run's real text, or it's masked form in a password control */
 591
 592   ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
 593   if (pRun->nFlags & MERF_GRAPHICS)
 594   {
 595     if (nOffset)
 596       ME_GetOLEObjectSize(&c, pRun, &size);
 597     ME_DestroyContext(&c);
 598     return nOffset != 0;
 599   } else if (pRun->nFlags & MERF_ENDPARA) {
 600     nOffset = 0;
 601   }
 602
 603   if (editor->cPasswordMask)
 604     strRunText = ME_MakeStringR(editor->cPasswordMask, pRun->strText->nLen);
 605   else
 606     strRunText = pRun->strText;
 607
 608   ME_GetTextExtent(&c,  strRunText->szData, nOffset, pRun->style, &size);
 609   ME_DestroyContext(&c);
 610   if (editor->cPasswordMask)
 611     ME_DestroyString(strRunText);
 612   return size.cx;
 613 }
 614
 615 /******************************************************************************
 616  * ME_GetRunSizeCommon
 617  *
 618  * Finds width, height, ascent and descent of a run, up to given character
 619  * (nLen).
 620  */
 621 static SIZE ME_GetRunSizeCommon(ME_Context *c, const ME_Paragraph *para, ME_Run *run, int nLen,
 622                                 int startx, int *pAscent, int *pDescent)
 623 {
 624   SIZE size;
 625   int nMaxLen = run->strText->nLen;
 626
 627   if (nLen>nMaxLen)
 628     nLen = nMaxLen;
 629
 630   /* FIXME the following call also ensures that TEXTMETRIC structure is filled
 631    * this is wasteful for MERF_NONTEXT runs, but that shouldn't matter
 632    * in practice
 633    */
 634
 635   if (c->editor->cPasswordMask)
 636   {
 637     ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,nLen);
 638     ME_GetTextExtent(c, szMasked->szData, nLen,run->style, &size);
 639     ME_DestroyString(szMasked);
 640   }
 641   else
 642   {
 643     ME_GetTextExtent(c, run->strText->szData, nLen, run->style, &size);
 644   }
 645   *pAscent = run->style->tm.tmAscent;
 646   *pDescent = run->style->tm.tmDescent;
 647   size.cy = *pAscent + *pDescent;
 648
 649   if (run->nFlags & MERF_TAB)
 650   {
 651     int pos = 0, i = 0, ppos, shift = 0;
 652     PARAFORMAT2 *pFmt = para->pFmt;
 653
 654     if (c->editor->bEmulateVersion10 && /* v1.0 - 3.0 */
 655         pFmt->dwMask & PFM_TABLE && pFmt->wEffects & PFE_TABLE)
 656       /* The horizontal gap shifts the tab positions to leave the gap. */
 657       shift = pFmt->dxOffset * 2;
 658     do {
 659       if (i < pFmt->cTabCount)
 660       {
 661         /* Only one side of the horizontal gap is needed at the end of
 662          * the table row. */
 663         if (i == pFmt->cTabCount -1)
 664           shift = shift >> 1;
 665         pos = shift + (pFmt->rgxTabs[i]&0x00FFFFFF);
 666         i++;
 667       }
 668       else
 669       {
 670         pos += lDefaultTab - (pos % lDefaultTab);
 671       }
 672       ppos = ME_twips2pointsX(c, pos);
 673       if (ppos > startx + run->pt.x) {
 674         size.cx = ppos - startx - run->pt.x;
 675         break;
 676       }
 677     } while(1);
 678     size.cy = *pAscent + *pDescent;
 679     return size;
 680   }
 681   if (run->nFlags & MERF_GRAPHICS)
 682   {
 683     ME_GetOLEObjectSize(c, run, &size);
 684     if (size.cy > *pAscent)
 685       *pAscent = size.cy;
 686     /* descent is unchanged */
 687     return size;
 688   }
 689   return size;
 690 }
 691
 692 /******************************************************************************
 693  * ME_GetRunSize
 694  *
 695  * Finds width and height (but not ascent and descent) of a part of the run
 696  * up to given character.
 697  */
 698 SIZE ME_GetRunSize(ME_Context *c, const ME_Paragraph *para,
 699                    ME_Run *run, int nLen, int startx)
 700 {
 701   int asc, desc;
 702   return ME_GetRunSizeCommon(c, para, run, nLen, startx, &asc, &desc);
 703 }
 704
 705 /******************************************************************************
 706  * ME_CalcRunExtent
 707  *
 708  * Updates the size of the run (fills width, ascent and descent). The height
 709  * is calculated based on whole row's ascent and descent anyway, so no need
 710  * to use it here.
 711  */
 712 void ME_CalcRunExtent(ME_Context *c, const ME_Paragraph *para, int startx, ME_Run *run)
 713 {
 714   if (run->nFlags & MERF_HIDDEN)
 715     run->nWidth = 0;
 716   else
 717   {
 718     int nEnd = run->strText->nLen;
 719     SIZE size = ME_GetRunSizeCommon(c, para, run, nEnd, startx,
 720                                     &run->nAscent, &run->nDescent);
 721     run->nWidth = size.cx;
 722     if (!size.cx)
 723       WARN("size.cx == 0\n");
 724   }
 725 }
 726
 727 /******************************************************************************
 728  * ME_SetSelectionCharFormat
 729  *
 730  * Applies a style change, either to a current selection, or to insert cursor
 731  * (ie. the style next typed characters will use).
 732  */
 733 void ME_SetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 734 {
 735   int nFrom, nTo;
 736   ME_GetSelection(editor, &nFrom, &nTo);
 737   if (nFrom == nTo)
 738   {
 739     ME_Style *s;
 740     if (!editor->pBuffer->pCharStyle)
 741       editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 742     s = ME_ApplyStyle(editor->pBuffer->pCharStyle, pFmt);
 743     ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 744     editor->pBuffer->pCharStyle = s;
 745   }
 746   else
 747     ME_SetCharFormat(editor, nFrom, nTo-nFrom, pFmt);
 748 }
 749
 750 /******************************************************************************
 751  * ME_SetCharFormat
 752  *
 753  * Applies a style change to the specified part of the text
 754  */
 755 void ME_SetCharFormat(ME_TextEditor *editor, int nOfs, int nChars, CHARFORMAT2W *pFmt)
 756 {
 757   ME_Cursor tmp, tmp2;
 758   ME_DisplayItem *para;
 759
 760   ME_CursorFromCharOfs(editor, nOfs, &tmp);
 761   if (tmp.nOffset)
 762     tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
 763
 764   ME_CursorFromCharOfs(editor, nOfs+nChars, &tmp2);
 765   if (tmp2.nOffset)
 766     tmp2.pRun = ME_SplitRunSimple(editor, tmp2.pRun, tmp2.nOffset);
 767
 768   para = tmp.pPara;
 769   para->member.para.nFlags |= MEPF_REWRAP;
 770
 771   while(tmp.pRun != tmp2.pRun)
 772   {
 773     ME_UndoItem *undo = NULL;
 774     ME_Style *new_style = ME_ApplyStyle(tmp.pRun->member.run.style, pFmt);
 775     /* ME_DumpStyle(new_style); */
 776     undo = ME_AddUndoItem(editor, diUndoSetCharFormat, NULL);
 777     if (undo) {
 778       undo->nStart = tmp.pRun->member.run.nCharOfs+para->member.para.nCharOfs;
 779       undo->nLen = tmp.pRun->member.run.strText->nLen;
 780       undo->di.member.ustyle = tmp.pRun->member.run.style;
 781       /* we'd have to addref undo...ustyle and release tmp...style
 782          but they'd cancel each other out so we can do nothing instead */
 783     }
 784     else
 785       ME_ReleaseStyle(tmp.pRun->member.run.style);
 786     tmp.pRun->member.run.style = new_style;
 787     tmp.pRun = ME_FindItemFwd(tmp.pRun, diRunOrParagraph);
 788     if (tmp.pRun->type == diParagraph)
 789     {
 790       para = tmp.pRun;
 791       tmp.pRun = ME_FindItemFwd(tmp.pRun, diRun);
 792       if (tmp.pRun != tmp2.pRun)
 793         para->member.para.nFlags |= MEPF_REWRAP;
 794     }
 795     assert(tmp.pRun);
 796   }
 797 }
 798
 799 /******************************************************************************
 800  * ME_SetDefaultCharFormat
 801  *
 802  * Applies a style change to the default character style.
 803  */
 804 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 805 {
 806   ME_Style *style;
 807
 808   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 809   style = ME_ApplyStyle(editor->pBuffer->pDefaultStyle, mod);
 810   editor->pBuffer->pDefaultStyle->fmt = style->fmt;
 811   editor->pBuffer->pDefaultStyle->tm = style->tm;
 812   ME_ReleaseStyle(style);
 813   ME_MarkAllForWrapping(editor);
 814   /*  pcf = editor->pBuffer->pDefaultStyle->fmt; */
 815 }
 816
 817 static void ME_GetRunCharFormat(ME_TextEditor *editor, ME_DisplayItem *run, CHARFORMAT2W *pFmt)
 818 {
 819   ME_CopyCharFormat(pFmt, &run->member.run.style->fmt);
 820   if ((pFmt->dwMask & CFM_UNDERLINETYPE) && (pFmt->bUnderlineType == CFU_CF1UNDERLINE))
 821   {
 822     pFmt->dwMask |= CFM_UNDERLINE;
 823     pFmt->dwEffects |= CFE_UNDERLINE;
 824   }
 825   if ((pFmt->dwMask & CFM_UNDERLINETYPE) && (pFmt->bUnderlineType == CFU_UNDERLINENONE))
 826   {
 827     pFmt->dwMask |= CFM_UNDERLINE;
 828     pFmt->dwEffects &= ~CFE_UNDERLINE;
 829   }
 830 }
 831
 832 /******************************************************************************
 833  * ME_GetDefaultCharFormat
 834  *
 835  * Retrieves the current default character style (the one applied where no
 836  * other style was applied) .
 837  */
 838 void ME_GetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 839 {
 840   ME_CopyCharFormat(pFmt, &editor->pBuffer->pDefaultStyle->fmt);
 841 }
 842
 843 /******************************************************************************
 844  * ME_GetSelectionCharFormat
 845  *
 846  * If selection exists, it returns all style elements that are set consistently
 847  * in the whole selection. If not, it just returns the current style.
 848  */
 849 void ME_GetSelectionCharFormat(ME_TextEditor *editor, CHARFORMAT2W *pFmt)
 850 {
 851   int nFrom, nTo;
 852   ME_GetSelection(editor, &nFrom, &nTo);
 853   if (nFrom == nTo && editor->pBuffer->pCharStyle)
 854   {
 855     ME_CopyCharFormat(pFmt, &editor->pBuffer->pCharStyle->fmt);
 856     return;
 857   }
 858   ME_GetCharFormat(editor, nFrom, nTo, pFmt);
 859 }
 860
 861 /******************************************************************************
 862  * ME_GetCharFormat
 863  *
 864  * Returns the style consisting of those attributes which are consistently set
 865  * in the whole character range.
 866  */
 867 void ME_GetCharFormat(ME_TextEditor *editor, int nFrom, int nTo, CHARFORMAT2W *pFmt)
 868 {
 869   ME_DisplayItem *run, *run_end;
 870   int nOffset, nOffset2;
 871   CHARFORMAT2W tmp;
 872
 873   ME_RunOfsFromCharOfs(editor, nFrom, NULL, &run, &nOffset);
 874   if (nFrom == nTo) /* special case - if selection is empty, take previous char's formatting */
 875   {
 876     if (!nOffset)
 877     {
 878       ME_DisplayItem *tmp_run = ME_FindItemBack(run, diRunOrParagraph);
 879       if (tmp_run->type == diRun) {
 880         ME_GetRunCharFormat(editor, tmp_run, pFmt);
 881         return;
 882       }
 883     }
 884     ME_GetRunCharFormat(editor, run, pFmt);
 885     return;
 886   }
 887
 888   if (nTo>nFrom) /* selection consists of chars from nFrom up to nTo-1 */
 889     nTo--;
 890   ME_RunOfsFromCharOfs(editor, nTo, NULL, &run_end, &nOffset2);
 891
 892   ME_GetRunCharFormat(editor, run, pFmt);
 893
 894   if (run == run_end) return;
 895
 896   do {
 897     /* FIXME add more style feature comparisons */
 898     int nAttribs = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_UNDERLINETYPE;
 899     int nEffects = CFM_BOLD | CFM_ITALIC | CFM_UNDERLINE | CFM_STRIKEOUT | CFM_PROTECTED | CFM_LINK | CFM_SUPERSCRIPT;
 900
 901     run = ME_FindItemFwd(run, diRun);
 902
 903     ZeroMemory(&tmp, sizeof(tmp));
 904     tmp.cbSize = sizeof(tmp);
 905     ME_GetRunCharFormat(editor, run, &tmp);
 906
 907     assert((tmp.dwMask & nAttribs) == nAttribs);
 908     /* reset flags that differ */
 909
 910     if (pFmt->yHeight != tmp.yHeight)
 911       pFmt->dwMask &= ~CFM_SIZE;
 912     if (pFmt->dwMask & CFM_FACE)
 913     {
 914       if (!(tmp.dwMask & CFM_FACE))
 915         pFmt->dwMask &= ~CFM_FACE;
 916       else if (lstrcmpW(pFmt->szFaceName, tmp.szFaceName) ||
 917           pFmt->bPitchAndFamily != tmp.bPitchAndFamily)
 918         pFmt->dwMask &= ~CFM_FACE;
 919     }
 920     if (pFmt->yHeight != tmp.yHeight)
 921       pFmt->dwMask &= ~CFM_SIZE;
 922     if (pFmt->bUnderlineType != tmp.bUnderlineType)
 923       pFmt->dwMask &= ~CFM_UNDERLINETYPE;
 924     if (pFmt->dwMask & CFM_COLOR)
 925     {
 926       if (!((pFmt->dwEffects&CFE_AUTOCOLOR) & (tmp.dwEffects&CFE_AUTOCOLOR)))
 927       {
 928         if (pFmt->crTextColor != tmp.crTextColor)
 929           pFmt->dwMask &= ~CFM_COLOR;
 930       }
 931     }
 932
 933     pFmt->dwMask &= ~((pFmt->dwEffects ^ tmp.dwEffects) & nEffects);
 934     pFmt->dwEffects = tmp.dwEffects;
 935
 936   } while(run != run_end);
 937 }