dlls/riched20/style.c

   1 /*
   2  * RichEdit style management functions
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "editor.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  24 WINE_DECLARE_DEBUG_CHANNEL(richedit_style);
  25
  26 static int all_refs = 0;
  27
  28 /* the following routines assume that:
  29  * - char2[AW] extends char[AW] by adding fields at the end of the charA form)
  30  * - szFaceName is the last field of char[AW] form, and wWeight the first of 2[AW]
  31  * - the difference between A and W form is the szFaceName as Ansi vs Unicode string
  32  * - because of alignment, offset of wWeight field in 2[AW] structure *IS NOT*
  33  *   sizeof(char[AW])
  34  */
  35
  36 CHARFORMAT2W *ME_ToCF2W(CHARFORMAT2W *to, CHARFORMAT2W *from)
  37 {
  38   if (from->cbSize == sizeof(CHARFORMATA))
  39   {
  40     CHARFORMATA *f = (CHARFORMATA *)from;
  41     CopyMemory(to, f, FIELD_OFFSET(CHARFORMATA, szFaceName));
  42     to->cbSize = sizeof(CHARFORMAT2W);
  43     if (f->dwMask & CFM_FACE) {
  44       MultiByteToWideChar(0, 0, f->szFaceName, -1, to->szFaceName, sizeof(to->szFaceName)/sizeof(WCHAR));
  45     }
  46     return to;
  47   }
  48   if (from->cbSize == sizeof(CHARFORMATW))
  49   {
  50     CHARFORMATW *f = (CHARFORMATW *)from;
  51     CopyMemory(to, f, sizeof(*f));
  52     /* theoretically, we don't need to zero the remaining memory */
  53     ZeroMemory(&to->wWeight, sizeof(CHARFORMAT2W)-FIELD_OFFSET(CHARFORMAT2W, wWeight));
  54     to->cbSize = sizeof(CHARFORMAT2W);
  55     return to;
  56   }
  57   if (from->cbSize == sizeof(CHARFORMAT2A))
  58   {
  59     CHARFORMAT2A *f = (CHARFORMAT2A *)from;
  60     /* copy the A structure without face name */
  61     CopyMemory(to, f, FIELD_OFFSET(CHARFORMATA, szFaceName));
  62     /* convert face name */
  63     if (f->dwMask & CFM_FACE)
  64       MultiByteToWideChar(0, 0, f->szFaceName, -1, to->szFaceName, sizeof(to->szFaceName)/sizeof(WCHAR));
  65     /* copy the rest of the 2A structure to 2W */
  66     CopyMemory(&to->wWeight, &f->wWeight, sizeof(CHARFORMAT2A)-FIELD_OFFSET(CHARFORMAT2A, wWeight));
  67     to->cbSize = sizeof(CHARFORMAT2W);
  68     return to;
  69   }
  70
  71   return (from->cbSize >= sizeof(CHARFORMAT2W)) ? from : NULL;
  72 }
  73
  74 void ME_CopyToCF2W(CHARFORMAT2W *to, CHARFORMAT2W *from)
  75 {
  76   if (ME_ToCF2W(to, from) == from)
  77     *to = *from;
  78 }
  79
  80 CHARFORMAT2W *ME_ToCFAny(CHARFORMAT2W *to, CHARFORMAT2W *from)
  81 {
  82   assert(from->cbSize == sizeof(CHARFORMAT2W));
  83   if (to->cbSize == sizeof(CHARFORMATA))
  84   {
  85     CHARFORMATA *t = (CHARFORMATA *)to;
  86     CopyMemory(t, from, FIELD_OFFSET(CHARFORMATA, szFaceName));
  87     WideCharToMultiByte(0, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), 0, 0);
  88     if (from->dwMask & CFM_UNDERLINETYPE)
  89     {
  90         switch (from->bUnderlineType)
  91         {
  92         case CFU_CF1UNDERLINE:
  93             to->dwMask |= CFM_UNDERLINE;
  94             to->dwEffects |= CFE_UNDERLINE;
  95             break;
  96         case CFU_UNDERLINENONE:
  97             to->dwMask |= CFM_UNDERLINE;
  98             to->dwEffects &= ~CFE_UNDERLINE;
  99             break;
 100         }
 101     }
 102     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
 103     return to;
 104   }
 105   if (to->cbSize == sizeof(CHARFORMATW))
 106   {
 107     CHARFORMATW *t = (CHARFORMATW *)to;
 108     CopyMemory(t, from, sizeof(*t));
 109     if (from->dwMask & CFM_UNDERLINETYPE)
 110     {
 111         switch (from->bUnderlineType)
 112         {
 113         case CFU_CF1UNDERLINE:
 114             to->dwMask |= CFM_UNDERLINE;
 115             to->dwEffects |= CFE_UNDERLINE;
 116             break;
 117         case CFU_UNDERLINENONE:
 118             to->dwMask |= CFM_UNDERLINE;
 119             to->dwEffects &= ~CFE_UNDERLINE;
 120             break;
 121         }
 122     }
 123     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
 124     return to;
 125   }
 126   if (to->cbSize == sizeof(CHARFORMAT2A))
 127   {
 128     CHARFORMAT2A *t = (CHARFORMAT2A *)to;
 129     /* copy the A structure without face name */
 130     CopyMemory(t, from, FIELD_OFFSET(CHARFORMATA, szFaceName));
 131     /* convert face name */
 132     WideCharToMultiByte(0, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), 0, 0);
 133     /* copy the rest of the 2A structure to 2W */
 134     CopyMemory(&t->wWeight, &from->wWeight, sizeof(CHARFORMAT2W)-FIELD_OFFSET(CHARFORMAT2W,wWeight));
 135     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
 136     return to;
 137   }
 138   assert(to->cbSize >= sizeof(CHARFORMAT2W));
 139   return from;
 140 }
 141
 142 void ME_CopyToCFAny(CHARFORMAT2W *to, CHARFORMAT2W *from)
 143 {
 144   if (ME_ToCFAny(to, from) == from)
 145     CopyMemory(to, from, to->cbSize);
 146 }
 147
 148 ME_Style *ME_MakeStyle(CHARFORMAT2W *style) {
 149   CHARFORMAT2W styledata;
 150   ME_Style *s = ALLOC_OBJ(ME_Style);
 151
 152   style = ME_ToCF2W(&styledata, style);
 153   memset(s, 0, sizeof(ME_Style));
 154   if (style->cbSize <= sizeof(CHARFORMAT2W))
 155     CopyMemory(&s->fmt, style, style->cbSize);
 156   else
 157     s->fmt = *style;
 158   s->fmt.cbSize = sizeof(CHARFORMAT2W);
 159
 160   s->nSequence = -2;
 161   s->nRefs = 1;
 162   s->hFont = NULL;
 163   s->tm.tmAscent = -1;
 164   all_refs++;
 165   return s;
 166 }
 167
 168 #define COPY_STYLE_ITEM(mask, member) \
 169   if (style->dwMask & mask) { \
 170     s->fmt.dwMask |= mask;\
 171     s->fmt.member = style->member;\
 172   }
 173
 174 #define COPY_STYLE_ITEM_MEMCPY(mask, member) \
 175   if (style->dwMask & mask) { \
 176     s->fmt.dwMask |= mask;\
 177     CopyMemory(s->fmt.member, style->member, sizeof(style->member));\
 178   }
 179
 180 void ME_InitCharFormat2W(CHARFORMAT2W *pFmt)
 181 {
 182   ZeroMemory(pFmt, sizeof(CHARFORMAT2W));
 183   pFmt->cbSize = sizeof(CHARFORMAT2W);
 184 }
 185
 186 ME_Style *ME_ApplyStyle(ME_Style *sSrc, CHARFORMAT2W *style)
 187 {
 188   CHARFORMAT2W styledata;
 189   ME_Style *s = ME_MakeStyle(&sSrc->fmt);
 190   style = ME_ToCF2W(&styledata, style);
 191   COPY_STYLE_ITEM(CFM_ANIMATION, bAnimation);
 192   COPY_STYLE_ITEM(CFM_BACKCOLOR, crBackColor);
 193   COPY_STYLE_ITEM(CFM_CHARSET, bCharSet);
 194   COPY_STYLE_ITEM(CFM_COLOR, crTextColor);
 195   COPY_STYLE_ITEM_MEMCPY(CFM_FACE, szFaceName);
 196   COPY_STYLE_ITEM(CFM_KERNING, wKerning);
 197   COPY_STYLE_ITEM(CFM_LCID, lcid);
 198   COPY_STYLE_ITEM(CFM_OFFSET, yOffset);
 199   COPY_STYLE_ITEM(CFM_REVAUTHOR, bRevAuthor);
 200   COPY_STYLE_ITEM(CFM_SIZE, yHeight);
 201   COPY_STYLE_ITEM(CFM_SPACING, sSpacing);
 202   COPY_STYLE_ITEM(CFM_STYLE, sStyle);
 203   COPY_STYLE_ITEM(CFM_UNDERLINETYPE, bUnderlineType);
 204   COPY_STYLE_ITEM(CFM_WEIGHT, wWeight);
 205   /* FIXME: this is not documented this way, but that's the more logical */
 206   COPY_STYLE_ITEM(CFM_FACE, bPitchAndFamily);
 207
 208   s->fmt.dwEffects &= ~(style->dwMask);
 209   s->fmt.dwEffects |= style->dwEffects & style->dwMask;
 210   s->fmt.dwMask |= style->dwMask;
 211   if (style->dwMask & CFM_COLOR)
 212   {
 213     if (style->dwEffects & CFE_AUTOCOLOR)
 214       s->fmt.dwEffects |= CFE_AUTOCOLOR;
 215     else
 216       s->fmt.dwEffects &= ~CFE_AUTOCOLOR;
 217   }
 218   if (style->dwMask & CFM_UNDERLINE)
 219   {
 220       s->fmt.dwMask |= CFM_UNDERLINETYPE;
 221       s->fmt.bUnderlineType = (style->dwEffects & CFM_UNDERLINE) ?
 222           CFU_CF1UNDERLINE : CFU_UNDERLINENONE;
 223   }
 224   if (style->dwMask & CFM_BOLD && !(style->dwMask & CFM_WEIGHT))
 225   {
 226       s->fmt.wWeight = (style->dwEffects & CFE_BOLD) ? FW_BOLD : FW_NORMAL;
 227   } else if (style->dwMask & CFM_WEIGHT && !(style->dwMask & CFM_BOLD)) {
 228       if (style->wWeight > FW_NORMAL)
 229           s->fmt.dwEffects |= CFE_BOLD;
 230       else
 231           s->fmt.dwEffects &= ~CFE_BOLD;
 232   }
 233   return s;
 234 }
 235
 236 void ME_CopyCharFormat(CHARFORMAT2W *pDest, const CHARFORMAT2W *pSrc)
 237 {
 238   /* using this with non-2W structs is forbidden */
 239   assert(pSrc->cbSize == sizeof(CHARFORMAT2W));
 240   assert(pDest->cbSize == sizeof(CHARFORMAT2W));
 241   *pDest = *pSrc;
 242 }
 243
 244 static void ME_DumpStyleEffect(char **p, const char *name, const CHARFORMAT2W *fmt, int mask)
 245 {
 246   *p += sprintf(*p, "%-22s%s\n", name, (fmt->dwMask & mask) ? ((fmt->dwEffects & mask) ? "YES" : "no") : "N/A");
 247 }
 248
 249 void ME_DumpStyle(ME_Style *s)
 250 {
 251   char buf[2048];
 252   ME_DumpStyleToBuf(&s->fmt, buf);
 253   TRACE_(richedit_style)("%s\n", buf);
 254 }
 255
 256 void ME_DumpStyleToBuf(CHARFORMAT2W *pFmt, char buf[2048])
 257 {
 258   /* FIXME only CHARFORMAT styles implemented */
 259   /* this function sucks, doesn't check for buffer overruns but it's "good enough" as for debug code */
 260   char *p;
 261   p = buf;
 262   p += sprintf(p, "Font face:            ");
 263   if (pFmt->dwMask & CFM_FACE) {
 264     WCHAR *q = pFmt->szFaceName;
 265     while(*q) {
 266       *p++ = (*q > 255) ? '?' : *q;
 267       q++;
 268     }
 269   } else
 270     p += sprintf(p, "N/A");
 271
 272   if (pFmt->dwMask & CFM_SIZE)
 273     p += sprintf(p, "\nFont size:            %d\n", pFmt->yHeight);
 274   else
 275     p += sprintf(p, "\nFont size:            N/A\n");
 276
 277   if (pFmt->dwMask & CFM_OFFSET)
 278     p += sprintf(p, "Char offset:          %d\n", pFmt->yOffset);
 279   else
 280     p += sprintf(p, "Char offset:          N/A\n");
 281
 282   if (pFmt->dwMask & CFM_CHARSET)
 283     p += sprintf(p, "Font charset:         %d\n", (int)pFmt->bCharSet);
 284   else
 285     p += sprintf(p, "Font charset:         N/A\n");
 286
 287   /* I'm assuming CFM_xxx and CFE_xxx are the same values, fortunately it IS true wrt used flags*/
 288   ME_DumpStyleEffect(&p, "Font bold:", pFmt, CFM_BOLD);
 289   ME_DumpStyleEffect(&p, "Font italic:", pFmt, CFM_ITALIC);
 290   ME_DumpStyleEffect(&p, "Font underline:", pFmt, CFM_UNDERLINE);
 291   ME_DumpStyleEffect(&p, "Font strikeout:", pFmt, CFM_STRIKEOUT);
 292   ME_DumpStyleEffect(&p, "Hidden text:", pFmt, CFM_HIDDEN);
 293   p += sprintf(p, "Text color:           ");
 294   if (pFmt->dwMask & CFM_COLOR)
 295   {
 296     if (pFmt->dwEffects & CFE_AUTOCOLOR)
 297       p += sprintf(p, "auto\n");
 298     else
 299       p += sprintf(p, "%06x\n", (int)pFmt->crTextColor);
 300   }
 301   else
 302     p += sprintf(p, "N/A\n");
 303   ME_DumpStyleEffect(&p, "Text protected:", pFmt, CFM_PROTECTED);
 304 }
 305
 306
 307 static void
 308 ME_LogFontFromStyle(ME_Context* c, LOGFONTW *lf, const ME_Style *s)
 309 {
 310   ZeroMemory(lf, sizeof(LOGFONTW));
 311   lstrcpyW(lf->lfFaceName, s->fmt.szFaceName);
 312
 313   lf->lfHeight = ME_twips2pointsY(c, -s->fmt.yHeight);
 314
 315   lf->lfWeight = FW_NORMAL;
 316   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_BOLD)
 317     lf->lfWeight = FW_BOLD;
 318   if (s->fmt.dwMask & CFM_WEIGHT)
 319     lf->lfWeight = s->fmt.wWeight;
 320   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_ITALIC)
 321     lf->lfItalic = 1;
 322   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_UNDERLINE | CFE_LINK))
 323     lf->lfUnderline = 1;
 324   if (s->fmt.dwMask & CFM_UNDERLINETYPE && s->fmt.bUnderlineType == CFU_CF1UNDERLINE)
 325     lf->lfUnderline = 1;
 326   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_STRIKEOUT)
 327     lf->lfStrikeOut = 1;
 328   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_SUBSCRIPT|CFM_SUPERSCRIPT))
 329     lf->lfHeight = (lf->lfHeight*2)/3;
 330 /*lf.lfQuality = PROOF_QUALITY; */
 331   if (s->fmt.dwMask & CFM_FACE)
 332     lf->lfPitchAndFamily = s->fmt.bPitchAndFamily;
 333   if (s->fmt.dwMask & CFM_CHARSET)
 334     lf->lfCharSet = s->fmt.bCharSet;
 335 }
 336
 337 void ME_CharFormatFromLogFont(HDC hDC, const LOGFONTW *lf, CHARFORMAT2W *fmt)
 338 {
 339   int ry;
 340
 341   ME_InitCharFormat2W(fmt);
 342   ry = GetDeviceCaps(hDC, LOGPIXELSY);
 343   lstrcpyW(fmt->szFaceName, lf->lfFaceName);
 344   fmt->dwEffects = 0;
 345   fmt->dwMask = CFM_WEIGHT|CFM_BOLD|CFM_ITALIC|CFM_UNDERLINE|CFM_STRIKEOUT|CFM_SIZE|CFM_FACE|CFM_CHARSET;
 346   fmt->wWeight = lf->lfWeight;
 347   fmt->yHeight = -lf->lfHeight*1440/ry;
 348   if (lf->lfWeight > FW_NORMAL) fmt->dwEffects |= CFM_BOLD;
 349   if (lf->lfItalic) fmt->dwEffects |= CFM_ITALIC;
 350   if (lf->lfUnderline) fmt->dwEffects |= CFM_UNDERLINE;
 351   /* notice that if a logfont was created with underline due to CFM_LINK, this
 352       would add an erroneous CFM_UNDERLINE. This isn't currently ever a problem. */
 353   if (lf->lfStrikeOut) fmt->dwEffects |= CFM_STRIKEOUT;
 354   fmt->bPitchAndFamily = lf->lfPitchAndFamily;
 355   fmt->bCharSet = lf->lfCharSet;
 356 }
 357
 358 static BOOL ME_IsFontEqual(const LOGFONTW *p1, const LOGFONTW *p2)
 359 {
 360   if (memcmp(p1, p2, sizeof(LOGFONTW)-sizeof(p1->lfFaceName)))
 361     return FALSE;
 362   if (lstrcmpW(p1->lfFaceName, p2->lfFaceName))
 363     return FALSE;
 364   return TRUE;
 365 }
 366
 367 HFONT ME_SelectStyleFont(ME_Context *c, ME_Style *s)
 368 {
 369   HFONT hOldFont;
 370   LOGFONTW lf;
 371   int i, nEmpty, nAge = 0x7FFFFFFF;
 372   ME_FontCacheItem *item;
 373   assert(c->hDC);
 374   assert(s);
 375
 376   ME_LogFontFromStyle(c, &lf, s);
 377
 378   for (i=0; i<HFONT_CACHE_SIZE; i++)
 379     c->editor->pFontCache[i].nAge++;
 380   for (i=0, nEmpty=-1, nAge=0; i<HFONT_CACHE_SIZE; i++)
 381   {
 382     item = &c->editor->pFontCache[i];
 383     if (!item->nRefs)
 384     {
 385       if (item->nAge > nAge)
 386         nEmpty = i, nAge = item->nAge;
 387     }
 388     if (item->hFont && ME_IsFontEqual(&item->lfSpecs, &lf))
 389       break;
 390   }
 391   if (i < HFONT_CACHE_SIZE) /* found */
 392   {
 393     item = &c->editor->pFontCache[i];
 394     TRACE_(richedit_style)("font reused %d\n", i);
 395
 396     s->hFont = item->hFont;
 397     item->nRefs++;
 398   }
 399   else
 400   {
 401     item = &c->editor->pFontCache[nEmpty]; /* this legal even when nEmpty == -1, as we don't dereference it */
 402
 403     assert(nEmpty != -1); /* otherwise we leak cache entries or get too many fonts at once*/
 404     if (item->hFont) {
 405       TRACE_(richedit_style)("font deleted %d\n", nEmpty);
 406       DeleteObject(item->hFont);
 407       item->hFont = NULL;
 408     }
 409     s->hFont = CreateFontIndirectW(&lf);
 410     assert(s->hFont);
 411     TRACE_(richedit_style)("font created %d\n", nEmpty);
 412     item->hFont = s->hFont;
 413     item->nRefs = 1;
 414     item->lfSpecs = lf;
 415   }
 416   hOldFont = SelectObject(c->hDC, s->hFont);
 417   /* should be cached too, maybe ? */
 418   GetTextMetricsW(c->hDC, &s->tm);
 419   return hOldFont;
 420 }
 421
 422 void ME_UnselectStyleFont(ME_Context *c, ME_Style *s, HFONT hOldFont)
 423 {
 424   int i;
 425
 426   assert(c->hDC);
 427   assert(s);
 428   SelectObject(c->hDC, hOldFont);
 429   for (i=0; i<HFONT_CACHE_SIZE; i++)
 430   {
 431     ME_FontCacheItem *pItem = &c->editor->pFontCache[i];
 432     if (pItem->hFont == s->hFont && pItem->nRefs > 0)
 433     {
 434       pItem->nRefs--;
 435       pItem->nAge = 0;
 436       s->hFont = NULL;
 437       return;
 438     }
 439   }
 440   assert(0 == "UnselectStyleFont without SelectStyleFont");
 441 }
 442
 443 static void ME_DestroyStyle(ME_Style *s) {
 444   if (s->hFont)
 445   {
 446     DeleteObject(s->hFont);
 447     s->hFont = NULL;
 448   }
 449   FREE_OBJ(s);
 450 }
 451
 452 void ME_AddRefStyle(ME_Style *s)
 453 {
 454   assert(s->nRefs>0); /* style with 0 references isn't supposed to exist */
 455   s->nRefs++;
 456   all_refs++;
 457 }
 458
 459 void ME_ReleaseStyle(ME_Style *s)
 460 {
 461   s->nRefs--;
 462   all_refs--;
 463   if (s->nRefs==0)
 464     TRACE_(richedit_style)("destroy style %p, total refs=%d\n", s, all_refs);
 465   else
 466     TRACE_(richedit_style)("release style %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 467   if (!all_refs) TRACE("all style references freed (good!)\n");
 468   assert(s->nRefs>=0);
 469   if (!s->nRefs)
 470     ME_DestroyStyle(s);
 471 }
 472
 473 ME_Style *ME_GetInsertStyle(ME_TextEditor *editor, int nCursor) {
 474   if (ME_IsSelection(editor))
 475   {
 476     ME_Cursor c;
 477     int from, to;
 478
 479     ME_GetSelection(editor, &from, &to);
 480     ME_CursorFromCharOfs(editor, from, &c);
 481     ME_AddRefStyle(c.pRun->member.run.style);
 482     return c.pRun->member.run.style;
 483   }
 484   if (editor->pBuffer->pCharStyle) {
 485     ME_AddRefStyle(editor->pBuffer->pCharStyle);
 486     return editor->pBuffer->pCharStyle;
 487   }
 488   else
 489   {
 490     ME_Cursor *pCursor = &editor->pCursors[nCursor];
 491     ME_DisplayItem *pRunItem = pCursor->pRun;
 492     ME_DisplayItem *pPrevItem = NULL;
 493     if (pCursor->nOffset) {
 494       ME_Run *pRun = &pRunItem->member.run;
 495       ME_AddRefStyle(pRun->style);
 496       return pRun->style;
 497     }
 498     pPrevItem = ME_FindItemBack(pRunItem, diRunOrParagraph);
 499     if (pPrevItem->type == diRun)
 500     {
 501       ME_AddRefStyle(pPrevItem->member.run.style);
 502       return pPrevItem->member.run.style;
 503     }
 504     else
 505     {
 506       ME_AddRefStyle(pRunItem->member.run.style);
 507       return pRunItem->member.run.style;
 508     }
 509   }
 510 }
 511
 512 void ME_SaveTempStyle(ME_TextEditor *editor)
 513 {
 514   ME_Style *old_style = editor->pBuffer->pCharStyle;
 515   editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 516   if (old_style)
 517     ME_ReleaseStyle(old_style);
 518 }
 519
 520 void ME_ClearTempStyle(ME_TextEditor *editor)
 521 {
 522   if (!editor->pBuffer->pCharStyle) return;
 523   ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 524   editor->pBuffer->pCharStyle = NULL;
 525 }