dlls/riched20/paint.c

   1 /*
   2  * RichEdit - painting functions
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  * Copyright 2005 by Phil Krylov
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "editor.h"
  23
  24 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  25
  26 void ME_PaintContent(ME_TextEditor *editor, HDC hDC, BOOL bOnlyNew, const RECT *rcUpdate) {
  27   ME_DisplayItem *item;
  28   ME_Context c;
  29   int yoffset;
  30
  31   editor->nSequence++;
  32   yoffset = ME_GetYScrollPos(editor);
  33   ME_InitContext(&c, editor, hDC);
  34   SetBkMode(hDC, TRANSPARENT);
  35   ME_MoveCaret(editor);
  36   item = editor->pBuffer->pFirst->next;
  37   c.pt.y -= yoffset;
  38   while(item != editor->pBuffer->pLast) {
  39     int ye;
  40     assert(item->type == diParagraph);
  41     ye = c.pt.y + item->member.para.nHeight;
  42     if (!bOnlyNew || (item->member.para.nFlags & MEPF_REPAINT))
  43     {
  44       BOOL bPaint = (rcUpdate == NULL);
  45       if (rcUpdate)
  46         bPaint = c.pt.y<rcUpdate->bottom &&
  47           c.pt.y+item->member.para.nHeight>rcUpdate->top;
  48       if (bPaint)
  49       {
  50         ME_DrawParagraph(&c, item);
  51         if (!rcUpdate || (rcUpdate->top<=c.pt.y && rcUpdate->bottom>=ye))
  52           item->member.para.nFlags &= ~MEPF_REPAINT;
  53       }
  54     }
  55     c.pt.y = ye;
  56     item = item->member.para.next_para;
  57   }
  58   if (c.pt.y<c.rcView.bottom) {
  59     RECT rc;
  60     int xs = c.rcView.left, xe = c.rcView.right;
  61     int ys = c.pt.y, ye = c.rcView.bottom;
  62
  63     if (bOnlyNew)
  64     {
  65       int y1 = editor->nTotalLength-yoffset, y2 = editor->nLastTotalLength-yoffset;
  66       if (y1<y2)
  67         ys = y1, ye = y2+1;
  68       else
  69         ys = ye;
  70     }
  71
  72     if (rcUpdate && ys!=ye)
  73     {
  74       xs = rcUpdate->left, xe = rcUpdate->right;
  75       if (rcUpdate->top > ys)
  76         ys = rcUpdate->top;
  77       if (rcUpdate->bottom < ye)
  78         ye = rcUpdate->bottom;
  79     }
  80
  81     if (ye>ys) {
  82       rc.left = xs;
  83       rc.top = ys;
  84       rc.right = xe;
  85       rc.bottom = ye;
  86       FillRect(hDC, &rc, c.editor->hbrBackground);
  87     }
  88     if (ys == c.pt.y) /* don't overwrite the top bar */
  89       ys++;
  90   }
  91   if (editor->nTotalLength != editor->nLastTotalLength)
  92     ME_SendRequestResize(editor, FALSE);
  93   editor->nLastTotalLength = editor->nTotalLength;
  94   ME_DestroyContext(&c);
  95 }
  96
  97 void ME_Repaint(ME_TextEditor *editor)
  98 {
  99   if (ME_WrapMarkedParagraphs(editor))
 100   {
 101     ME_UpdateScrollBar(editor);
 102     FIXME("ME_Repaint had to call ME_WrapMarkedParagraphs\n");
 103   }
 104   ME_SendOldNotify(editor, EN_UPDATE);
 105   UpdateWindow(editor->hWnd);
 106 }
 107
 108 void ME_UpdateRepaint(ME_TextEditor *editor)
 109 {
 110   /* Should be called whenever the contents of the control have changed */
 111   ME_Cursor *pCursor;
 112
 113   if (ME_WrapMarkedParagraphs(editor))
 114     ME_UpdateScrollBar(editor);
 115
 116   /* Ensure that the cursor is visible */
 117   pCursor = &editor->pCursors[0];
 118   ME_EnsureVisible(editor, pCursor->pRun);
 119
 120   /* send EN_CHANGE if the event mask asks for it */
 121   if(editor->nEventMask & ENM_CHANGE)
 122   {
 123     editor->nEventMask &= ~ENM_CHANGE;
 124     ME_SendOldNotify(editor, EN_CHANGE);
 125     editor->nEventMask |= ENM_CHANGE;
 126   }
 127   ME_Repaint(editor);
 128   ME_SendSelChange(editor);
 129 }
 130
 131 void
 132 ME_RewrapRepaint(ME_TextEditor *editor)
 133 {
 134   /* RewrapRepaint should be called whenever the control has changed in
 135    * looks, but not content. Like resizing. */
 136
 137   ME_MarkAllForWrapping(editor);
 138   ME_WrapMarkedParagraphs(editor);
 139   ME_UpdateScrollBar(editor);
 140
 141   ME_Repaint(editor);
 142 }
 143
 144 int ME_twips2points(ME_Context *c, int x, int dpi)
 145 {
 146   if (c->editor->nZoomNumerator == 0)
 147     return x * dpi / 1440;
 148   else
 149     return x * dpi * c->editor->nZoomNumerator / 1440 / c->editor->nZoomDenominator;
 150 }
 151
 152 static void ME_DrawTextWithStyle(ME_Context *c, int x, int y, LPCWSTR szText, int nChars,
 153   ME_Style *s, int *width, int nSelFrom, int nSelTo, int ymin, int cy) {
 154   HDC hDC = c->hDC;
 155   HGDIOBJ hOldFont;
 156   COLORREF rgbOld;
 157   int yOffset = 0, yTwipsOffset = 0;
 158   SIZE          sz;
 159   COLORREF      rgb;
 160
 161   hOldFont = ME_SelectStyleFont(c->editor, hDC, s);
 162   if ((s->fmt.dwMask & CFM_LINK) && (s->fmt.dwEffects & CFE_LINK))
 163     rgb = RGB(0,0,255);
 164   else if ((s->fmt.dwMask & CFM_COLOR) && (s->fmt.dwEffects & CFE_AUTOCOLOR))
 165     rgb = GetSysColor(COLOR_WINDOWTEXT);
 166   else
 167     rgb = s->fmt.crTextColor;
 168   rgbOld = SetTextColor(hDC, rgb);
 169   if ((s->fmt.dwMask & s->fmt.dwEffects) & CFM_OFFSET) {
 170     yTwipsOffset = s->fmt.yOffset;
 171   }
 172   if ((s->fmt.dwMask & s->fmt.dwEffects) & (CFM_SUPERSCRIPT | CFM_SUBSCRIPT)) {
 173     if (s->fmt.dwEffects & CFE_SUPERSCRIPT) yTwipsOffset = s->fmt.yHeight/3;
 174     if (s->fmt.dwEffects & CFE_SUBSCRIPT) yTwipsOffset = -s->fmt.yHeight/12;
 175   }
 176   if (yTwipsOffset)
 177     yOffset = ME_twips2points(c, yTwipsOffset, GetDeviceCaps(hDC, LOGPIXELSY));
 178
 179   ExtTextOutW(hDC, x, y-yOffset, 0, NULL, szText, nChars, NULL);
 180   GetTextExtentPoint32W(hDC, szText, nChars, &sz);
 181   if (width) *width = sz.cx;
 182   if (s->fmt.dwMask & CFM_UNDERLINETYPE)
 183   {
 184     HPEN    hPen;
 185     switch (s->fmt.bUnderlineType)
 186     {
 187     case CFU_UNDERLINE:
 188     case CFU_UNDERLINEWORD: /* native seems to map it to simple underline (MSDN) */
 189     case CFU_UNDERLINEDOUBLE: /* native seems to map it to simple underline (MSDN) */
 190       hPen = CreatePen(PS_SOLID, 1, rgb);
 191       break;
 192     case CFU_UNDERLINEDOTTED:
 193       hPen = CreatePen(PS_DOT, 1, rgb);
 194       break;
 195     default:
 196       WINE_FIXME("Unknown underline type (%u)\n", s->fmt.bUnderlineType);
 197       /* fall through */
 198     case CFU_CF1UNDERLINE: /* this type is supported in the font, do nothing */
 199     case CFU_UNDERLINENONE:
 200       hPen = NULL;
 201       break;
 202     }
 203     if (hPen != NULL)
 204     {
 205       HPEN hOldPen = SelectObject(hDC, hPen);
 206       /* FIXME: should use textmetrics info for Descent info */
 207       MoveToEx(hDC, x, y - yOffset + 1, NULL);
 208       LineTo(hDC, x + sz.cx, y - yOffset + 1);
 209       SelectObject(hDC, hOldPen);
 210       DeleteObject(hPen);
 211     }
 212   }
 213   if (nSelFrom < nChars && nSelTo >= 0 && nSelFrom<nSelTo)
 214   {
 215     if (nSelFrom < 0) nSelFrom = 0;
 216     if (nSelTo > nChars) nSelTo = nChars;
 217     GetTextExtentPoint32W(hDC, szText, nSelFrom, &sz);
 218     x += sz.cx;
 219     GetTextExtentPoint32W(hDC, szText+nSelFrom, nSelTo-nSelFrom, &sz);
 220
 221     /* Invert selection if not hidden by EM_HIDESELECTION */
 222     if (c->editor->bHideSelection == FALSE)
 223         PatBlt(hDC, x, ymin, sz.cx, cy, DSTINVERT);
 224   }
 225   SetTextColor(hDC, rgbOld);
 226   ME_UnselectStyleFont(c->editor, hDC, s, hOldFont);
 227 }
 228
 229 static void ME_DebugWrite(HDC hDC, const POINT *pt, LPCWSTR szText) {
 230   int align = SetTextAlign(hDC, TA_LEFT|TA_TOP);
 231   HGDIOBJ hFont = SelectObject(hDC, GetStockObject(DEFAULT_GUI_FONT));
 232   COLORREF color = SetTextColor(hDC, RGB(128,128,128));
 233   TextOutW(hDC, pt->x, pt->y, szText, lstrlenW(szText));
 234   SelectObject(hDC, hFont);
 235   SetTextAlign(hDC, align);
 236   SetTextColor(hDC, color);
 237 }
 238
 239 static void ME_DrawGraphics(ME_Context *c, int x, int y, ME_Run *run,
 240                             ME_Paragraph *para, BOOL selected) {
 241   SIZE sz;
 242   int xs, ys, xe, ye, h, ym, width, eyes;
 243   ME_GetGraphicsSize(c->editor, run, &sz);
 244   xs = run->pt.x;
 245   ys = y-sz.cy;
 246   xe = xs+sz.cx;
 247   ye = y;
 248   h = ye-ys;
 249   ym = ys+h/4;
 250   width = sz.cx;
 251   eyes = width/8;
 252   /* draw a smiling face :) */
 253   Ellipse(c->hDC, xs, ys, xe, ye);
 254   Ellipse(c->hDC, xs+width/8, ym, x+width/8+eyes, ym+eyes);
 255   Ellipse(c->hDC, xs+7*width/8-eyes, ym, xs+7*width/8, ym+eyes);
 256   MoveToEx(c->hDC, xs+width/8, ys+3*h/4-eyes, NULL);
 257   LineTo(c->hDC, xs+width/8, ys+3*h/4);
 258   LineTo(c->hDC, xs+7*width/8, ys+3*h/4);
 259   LineTo(c->hDC, xs+7*width/8, ys+3*h/4-eyes);
 260   if (selected)
 261   {
 262     /* descent is usually (always?) 0 for graphics */
 263     PatBlt(c->hDC, x, y-run->nAscent, sz.cx, run->nAscent+run->nDescent, DSTINVERT);
 264   }
 265 }
 266
 267 static void ME_DrawRun(ME_Context *c, int x, int y, ME_DisplayItem *rundi, ME_Paragraph *para)
 268 {
 269   ME_Run *run = &rundi->member.run;
 270   ME_DisplayItem *start = ME_FindItemBack(rundi, diStartRow);
 271   int runofs = run->nCharOfs+para->nCharOfs;
 272   int nSelFrom, nSelTo;
 273   const WCHAR wszSpace[] = {' ', 0};
 274
 275   if (run->nFlags & MERF_HIDDEN)
 276     return;
 277
 278   ME_GetSelection(c->editor, &nSelFrom, &nSelTo);
 279
 280   /* Draw selected end-of-paragraph mark */
 281   if (run->nFlags & MERF_ENDPARA && runofs >= nSelFrom && runofs < nSelTo)
 282     ME_DrawTextWithStyle(c, x, y, wszSpace, 1, run->style, NULL, 0, 1,
 283                          c->pt.y + start->member.row.nYPos,
 284                          start->member.row.nHeight);
 285
 286   /* you can always comment it out if you need visible paragraph marks */
 287   if (run->nFlags & (MERF_ENDPARA | MERF_TAB | MERF_CELL))
 288     return;
 289
 290   if (run->nFlags & MERF_GRAPHICS)
 291     ME_DrawGraphics(c, x, y, run, para, (runofs >= nSelFrom) && (runofs < nSelTo));
 292   else
 293   {
 294     if (c->editor->cPasswordMask)
 295     {
 296       ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,ME_StrVLen(run->strText));
 297       ME_DrawTextWithStyle(c, x, y,
 298         szMasked->szData, ME_StrVLen(szMasked), run->style, NULL,
 299         nSelFrom-runofs,nSelTo-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 300       ME_DestroyString(szMasked);
 301     }
 302     else
 303       ME_DrawTextWithStyle(c, x, y,
 304         run->strText->szData, ME_StrVLen(run->strText), run->style, NULL,
 305         nSelFrom-runofs,nSelTo-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 306     }
 307 }
 308
 309 void ME_DrawParagraph(ME_Context *c, ME_DisplayItem *paragraph) {
 310   int align = SetTextAlign(c->hDC, TA_BASELINE);
 311   int dpi = GetDeviceCaps(c->hDC, LOGPIXELSX);
 312   ME_DisplayItem *p;
 313   ME_Run *run;
 314   ME_Paragraph *para = NULL;
 315   RECT rc, rcPara;
 316   int y = c->pt.y;
 317   int height = 0, baseline = 0, no=0, pno = 0;
 318   int xs = 0, xe = 0;
 319   BOOL visible = FALSE;
 320   int nMargWidth = 0;
 321
 322   c->pt.x = c->rcView.left;
 323   rcPara.left = c->rcView.left;
 324   rcPara.right = c->rcView.right;
 325   for (p = paragraph; p!=paragraph->member.para.next_para; p = p->next) {
 326     switch(p->type) {
 327       case diParagraph:
 328         para = &p->member.para;
 329         assert(para);
 330         nMargWidth = ME_twips2points(c, para->pFmt->dxStartIndent, dpi);
 331         if (pno != 0)
 332           nMargWidth += ME_twips2points(c, para->pFmt->dxOffset, dpi);
 333         xs = c->rcView.left+nMargWidth;
 334         xe = c->rcView.right - ME_twips2points(c, para->pFmt->dxRightIndent, dpi);
 335         break;
 336       case diStartRow:
 337         y += height;
 338         rcPara.top = y;
 339         rcPara.bottom = y+p->member.row.nHeight;
 340         visible = RectVisible(c->hDC, &rcPara);
 341         if (visible) {
 342           /* left margin */
 343           rc.left = c->rcView.left;
 344           rc.right = c->rcView.left+nMargWidth;
 345           rc.top = y;
 346           rc.bottom = y+p->member.row.nHeight;
 347           FillRect(c->hDC, &rc, c->editor->hbrBackground);
 348           /* right margin */
 349           rc.left = xe;
 350           rc.right = c->rcView.right;
 351           FillRect(c->hDC, &rc, c->editor->hbrBackground);
 352           rc.left = c->rcView.left+nMargWidth;
 353           rc.right = xe;
 354           FillRect(c->hDC, &rc, c->editor->hbrBackground);
 355         }
 356         if (me_debug)
 357         {
 358           const WCHAR wszRowDebug[] = {'r','o','w','[','%','d',']',0};
 359           WCHAR buf[128];
 360           POINT pt = c->pt;
 361           wsprintfW(buf, wszRowDebug, no);
 362           pt.y = 12+y;
 363           ME_DebugWrite(c->hDC, &pt, buf);
 364         }
 365
 366         height = p->member.row.nHeight;
 367         baseline = p->member.row.nBaseline;
 368         pno++;
 369         break;
 370       case diRun:
 371         assert(para);
 372         run = &p->member.run;
 373         if (visible && me_debug) {
 374           rc.left = c->rcView.left+run->pt.x;
 375           rc.right = c->rcView.left+run->pt.x+run->nWidth;
 376           rc.top = c->pt.y+run->pt.y;
 377           rc.bottom = c->pt.y+run->pt.y+height;
 378           TRACE("rc = (%d, %d, %d, %d)\n", rc.left, rc.top, rc.right, rc.bottom);
 379           if (run->nFlags & MERF_SKIPPED)
 380             DrawFocusRect(c->hDC, &rc);
 381           else
 382             FrameRect(c->hDC, &rc, GetSysColorBrush(COLOR_GRAYTEXT));
 383         }
 384         if (visible)
 385           ME_DrawRun(c, run->pt.x, c->pt.y+run->pt.y+baseline, p, &paragraph->member.para);
 386         if (me_debug)
 387         {
 388           /* I'm using %ls, hope wsprintfW is not going to use wrong (4-byte) WCHAR version */
 389           const WCHAR wszRunDebug[] = {'[','%','d',':','%','x',']',' ','%','l','s',0};
 390           WCHAR buf[2560];
 391           POINT pt;
 392           pt.x = run->pt.x;
 393           pt.y = c->pt.y + run->pt.y;
 394           wsprintfW(buf, wszRunDebug, no, p->member.run.nFlags, p->member.run.strText->szData);
 395           ME_DebugWrite(c->hDC, &pt, buf);
 396         }
 397         /* c->pt.x += p->member.run.nWidth; */
 398         break;
 399       default:
 400         break;
 401     }
 402     no++;
 403   }
 404   SetTextAlign(c->hDC, align);
 405 }
 406
 407 void ME_ScrollAbs(ME_TextEditor *editor, int absY)
 408 {
 409   ME_Scroll(editor, absY, 1);
 410 }
 411
 412 void ME_ScrollUp(ME_TextEditor *editor, int cy)
 413 {
 414   ME_Scroll(editor, cy, 2);
 415 }
 416
 417 void ME_ScrollDown(ME_TextEditor *editor, int cy)
 418 {
 419   ME_Scroll(editor, cy, 3);
 420 }
 421
 422 void ME_Scroll(ME_TextEditor *editor, int value, int type)
 423 {
 424   SCROLLINFO si;
 425   int nOrigPos, nNewPos, nActualScroll;
 426
 427   nOrigPos = ME_GetYScrollPos(editor);
 428
 429   si.cbSize = sizeof(SCROLLINFO);
 430   si.fMask = SIF_POS;
 431
 432   switch (type)
 433   {
 434     case 1:
 435       /*Scroll absolutly*/
 436       si.nPos = value;
 437       break;
 438     case 2:
 439       /* Scroll up - towards the beginning of the document */
 440       si.nPos = nOrigPos - value;
 441       break;
 442     case 3:
 443       /* Scroll down - towards the end of the document */
 444       si.nPos = nOrigPos + value;
 445       break;
 446     default:
 447       FIXME("ME_Scroll called incorrectly\n");
 448       si.nPos = 0;
 449   }
 450
 451   nNewPos = SetScrollInfo(editor->hWnd, SB_VERT, &si, editor->bRedraw);
 452   nActualScroll = nOrigPos - nNewPos;
 453   if (editor->bRedraw)
 454   {
 455     if (abs(nActualScroll) > editor->sizeWindow.cy)
 456       InvalidateRect(editor->hWnd, NULL, TRUE);
 457     else
 458       ScrollWindowEx(editor->hWnd, 0, nActualScroll, NULL, NULL, NULL, NULL, SW_INVALIDATE);
 459     ME_Repaint(editor);
 460   }
 461
 462   ME_UpdateScrollBar(editor);
 463 }
 464
 465
 466  void ME_UpdateScrollBar(ME_TextEditor *editor)
 467 {
 468   /* Note that this is the only funciton that should ever call SetScrolLInfo
 469    * with SIF_PAGE or SIF_RANGE. SetScrollPos and SetScrollRange should never
 470    * be used at all. */
 471
 472   HWND hWnd;
 473   SCROLLINFO si;
 474   BOOL bScrollBarWasVisible,bScrollBarWillBeVisible;
 475
 476   if (ME_WrapMarkedParagraphs(editor))
 477     FIXME("ME_UpdateScrollBar had to call ME_WrapMarkedParagraphs\n");
 478
 479   hWnd = editor->hWnd;
 480   si.cbSize = sizeof(si);
 481   bScrollBarWasVisible = ME_GetYScrollVisible(editor);
 482   bScrollBarWillBeVisible = editor->nHeight > editor->sizeWindow.cy;
 483
 484   if (bScrollBarWasVisible != bScrollBarWillBeVisible)
 485   {
 486     ShowScrollBar(hWnd, SB_VERT, bScrollBarWillBeVisible);
 487     ME_MarkAllForWrapping(editor);
 488     ME_WrapMarkedParagraphs(editor);
 489   }
 490
 491   si.fMask = SIF_PAGE | SIF_RANGE;
 492   if (GetWindowLongW(hWnd, GWL_STYLE) & ES_DISABLENOSCROLL)
 493     si.fMask |= SIF_DISABLENOSCROLL;
 494
 495   si.nMin = 0;
 496   si.nMax = editor->nTotalLength;
 497
 498   si.nPage = editor->sizeWindow.cy;
 499
 500   TRACE("min=%d max=%d page=%d\n", si.nMin, si.nMax, si.nPage);
 501   SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
 502 }
 503
 504 int ME_GetYScrollPos(ME_TextEditor *editor)
 505 {
 506   SCROLLINFO si;
 507   si.cbSize = sizeof(si);
 508   si.fMask = SIF_POS;
 509   GetScrollInfo(editor->hWnd, SB_VERT, &si);
 510   return si.nPos;
 511 }
 512
 513 BOOL ME_GetYScrollVisible(ME_TextEditor *editor)
 514 { /* Returns true if the scrollbar is visible */
 515   SCROLLBARINFO sbi;
 516   sbi.cbSize = sizeof(sbi);
 517   GetScrollBarInfo(editor->hWnd, OBJID_VSCROLL, &sbi);
 518   return ((sbi.rgstate[0] & STATE_SYSTEM_INVISIBLE) == 0);
 519 }
 520
 521 void ME_EnsureVisible(ME_TextEditor *editor, ME_DisplayItem *pRun)
 522 {
 523   ME_DisplayItem *pRow = ME_FindItemBack(pRun, diStartRow);
 524   ME_DisplayItem *pPara = ME_FindItemBack(pRun, diParagraph);
 525   int y, yrel, yheight, yold;
 526
 527   assert(pRow);
 528   assert(pPara);
 529
 530   y = pPara->member.para.nYPos+pRow->member.row.nYPos;
 531   yheight = pRow->member.row.nHeight;
 532   yold = ME_GetYScrollPos(editor);
 533   yrel = y - yold;
 534
 535   if (y < yold)
 536     ME_ScrollAbs(editor,y);
 537   else if (yrel + yheight > editor->sizeWindow.cy)
 538     ME_ScrollAbs(editor,y+yheight-editor->sizeWindow.cy);
 539 }
 540
 541
 542 void
 543 ME_InvalidateFromOfs(ME_TextEditor *editor, int nCharOfs)
 544 {
 545   RECT rc;
 546   int x, y, height;
 547   ME_Cursor tmp;
 548
 549   ME_RunOfsFromCharOfs(editor, nCharOfs, &tmp.pRun, &tmp.nOffset);
 550   ME_GetCursorCoordinates(editor, &tmp, &x, &y, &height);
 551
 552   rc.left = 0;
 553   rc.top = y;
 554   rc.bottom = y + height;
 555   rc.right = editor->rcFormat.right;
 556   InvalidateRect(editor->hWnd, &rc, FALSE);
 557 }
 558
 559
 560 void
 561 ME_InvalidateSelection(ME_TextEditor *editor)
 562 {
 563   ME_DisplayItem *para1, *para2;
 564   int nStart, nEnd;
 565   int len = ME_GetTextLength(editor);
 566
 567   ME_GetSelection(editor, &nStart, &nEnd);
 568   /* if both old and new selection are 0-char (= caret only), then
 569   there's no (inverted) area to be repainted, neither old nor new */
 570   if (nStart == nEnd && editor->nLastSelStart == editor->nLastSelEnd)
 571     return;
 572   ME_WrapMarkedParagraphs(editor);
 573   ME_GetSelectionParas(editor, &para1, &para2);
 574   assert(para1->type == diParagraph);
 575   assert(para2->type == diParagraph);
 576   /* last selection markers aren't always updated, which means
 577   they can point past the end of the document */
 578   if (editor->nLastSelStart > len || editor->nLastSelEnd > len) {
 579     ME_MarkForPainting(editor,
 580         ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph),
 581         ME_FindItemFwd(editor->pBuffer->pFirst, diTextEnd));
 582   } else {
 583     /* if the start part of selection is being expanded or contracted... */
 584     if (nStart < editor->nLastSelStart) {
 585       ME_MarkForPainting(editor, para1, ME_FindItemFwd(editor->pLastSelStartPara, diParagraphOrEnd));
 586     } else
 587     if (nStart > editor->nLastSelStart) {
 588       ME_MarkForPainting(editor, editor->pLastSelStartPara, ME_FindItemFwd(para1, diParagraphOrEnd));
 589     }
 590
 591     /* if the end part of selection is being contracted or expanded... */
 592     if (nEnd < editor->nLastSelEnd) {
 593       ME_MarkForPainting(editor, para2, ME_FindItemFwd(editor->pLastSelEndPara, diParagraphOrEnd));
 594     } else
 595     if (nEnd > editor->nLastSelEnd) {
 596       ME_MarkForPainting(editor, editor->pLastSelEndPara, ME_FindItemFwd(para2, diParagraphOrEnd));
 597     }
 598   }
 599
 600   ME_InvalidateMarkedParagraphs(editor);
 601   /* remember the last invalidated position */
 602   ME_GetSelection(editor, &editor->nLastSelStart, &editor->nLastSelEnd);
 603   ME_GetSelectionParas(editor, &editor->pLastSelStartPara, &editor->pLastSelEndPara);
 604   assert(editor->pLastSelStartPara->type == diParagraph);
 605   assert(editor->pLastSelEndPara->type == diParagraph);
 606 }
 607
 608 void
 609 ME_QueueInvalidateFromCursor(ME_TextEditor *editor, int nCursor)
 610 {
 611   editor->nInvalidOfs = ME_GetCursorOfs(editor, nCursor);
 612 }
 613
 614
 615 BOOL
 616 ME_SetZoom(ME_TextEditor *editor, int numerator, int denominator)
 617 {
 618   /* TODO: Zoom images and objects */
 619
 620   if (numerator != 0)
 621   {
 622     if (denominator == 0)
 623       return FALSE;
 624     if (1.0 / 64.0 > (float)numerator / (float)denominator
 625         || (float)numerator / (float)denominator > 64.0)
 626       return FALSE;
 627   }
 628
 629   editor->nZoomNumerator = numerator;
 630   editor->nZoomDenominator = denominator;
 631
 632   ME_RewrapRepaint(editor);
 633   return TRUE;
 634 }