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     ME_SendOldNotify(editor, EN_CHANGE);
 124   }
 125   ME_Repaint(editor);
 126   ME_SendSelChange(editor);
 127 }
 128
 129 void
 130 ME_RewrapRepaint(ME_TextEditor *editor)
 131 {
 132   /* RewrapRepaint should be called whenever the control has changed in
 133    * looks, but not content. Like resizing. */
 134
 135   ME_MarkAllForWrapping(editor);
 136   ME_WrapMarkedParagraphs(editor);
 137   ME_UpdateScrollBar(editor);
 138
 139   ME_Repaint(editor);
 140 }
 141
 142
 143 static void ME_DrawTextWithStyle(ME_Context *c, int x, int y, LPCWSTR szText, int nChars,
 144   ME_Style *s, int *width, int nSelFrom, int nSelTo, int ymin, int cy) {
 145   HDC hDC = c->hDC;
 146   HGDIOBJ hOldFont;
 147   COLORREF rgbOld, rgbBack;
 148   int yOffset = 0, yTwipsOffset = 0;
 149   hOldFont = ME_SelectStyleFont(c->editor, hDC, s);
 150   rgbBack = ME_GetBackColor(c->editor);
 151   if ((s->fmt.dwMask & CFM_LINK) && (s->fmt.dwEffects & CFE_LINK))
 152     rgbOld = SetTextColor(hDC, RGB(0,0,255));
 153   else if ((s->fmt.dwMask & CFM_COLOR) && (s->fmt.dwEffects & CFE_AUTOCOLOR))
 154     rgbOld = SetTextColor(hDC, GetSysColor(COLOR_WINDOWTEXT));
 155   else
 156     rgbOld = SetTextColor(hDC, s->fmt.crTextColor);
 157   if ((s->fmt.dwMask & s->fmt.dwEffects) & CFM_OFFSET) {
 158     yTwipsOffset = s->fmt.yOffset;
 159   }
 160   if ((s->fmt.dwMask & s->fmt.dwEffects) & (CFM_SUPERSCRIPT | CFM_SUBSCRIPT)) {
 161     if (s->fmt.dwEffects & CFE_SUPERSCRIPT) yTwipsOffset = s->fmt.yHeight/3;
 162     if (s->fmt.dwEffects & CFE_SUBSCRIPT) yTwipsOffset = -s->fmt.yHeight/12;
 163   }
 164   if (yTwipsOffset)
 165   {
 166     int numerator = 1;
 167     int denominator = 1;
 168
 169     if (c->editor->nZoomNumerator)
 170     {
 171       numerator = c->editor->nZoomNumerator;
 172       denominator = c->editor->nZoomDenominator;
 173     }
 174     yOffset = yTwipsOffset * GetDeviceCaps(hDC, LOGPIXELSY) * numerator / denominator / 1440;
 175   }
 176   ExtTextOutW(hDC, x, y-yOffset, 0, NULL, szText, nChars, NULL);
 177   if (width) {
 178     SIZE sz;
 179     GetTextExtentPoint32W(hDC, szText, nChars, &sz);
 180     *width = sz.cx;
 181   }
 182   if (nSelFrom < nChars && nSelTo >= 0 && nSelFrom<nSelTo)
 183   {
 184     SIZE sz;
 185     if (nSelFrom < 0) nSelFrom = 0;
 186     if (nSelTo > nChars) nSelTo = nChars;
 187     GetTextExtentPoint32W(hDC, szText, nSelFrom, &sz);
 188     x += sz.cx;
 189     GetTextExtentPoint32W(hDC, szText+nSelFrom, nSelTo-nSelFrom, &sz);
 190
 191     /* Invert selection if not hidden by EM_HIDESELECTION */
 192     if (c->editor->bHideSelection == FALSE)
 193         PatBlt(hDC, x, ymin, sz.cx, cy, DSTINVERT);
 194   }
 195   SetTextColor(hDC, rgbOld);
 196   ME_UnselectStyleFont(c->editor, hDC, s, hOldFont);
 197 }
 198
 199 static void ME_DebugWrite(HDC hDC, const POINT *pt, LPCWSTR szText) {
 200   int align = SetTextAlign(hDC, TA_LEFT|TA_TOP);
 201   HGDIOBJ hFont = SelectObject(hDC, GetStockObject(DEFAULT_GUI_FONT));
 202   COLORREF color = SetTextColor(hDC, RGB(128,128,128));
 203   TextOutW(hDC, pt->x, pt->y, szText, lstrlenW(szText));
 204   SelectObject(hDC, hFont);
 205   SetTextAlign(hDC, align);
 206   SetTextColor(hDC, color);
 207 }
 208
 209 static void ME_DrawGraphics(ME_Context *c, int x, int y, ME_Run *run,
 210                             ME_Paragraph *para, BOOL selected) {
 211   SIZE sz;
 212   int xs, ys, xe, ye, h, ym, width, eyes;
 213   ME_GetGraphicsSize(c->editor, run, &sz);
 214   xs = run->pt.x;
 215   ys = y-sz.cy;
 216   xe = xs+sz.cx;
 217   ye = y;
 218   h = ye-ys;
 219   ym = ys+h/4;
 220   width = sz.cx;
 221   eyes = width/8;
 222   /* draw a smiling face :) */
 223   Ellipse(c->hDC, xs, ys, xe, ye);
 224   Ellipse(c->hDC, xs+width/8, ym, x+width/8+eyes, ym+eyes);
 225   Ellipse(c->hDC, xs+7*width/8-eyes, ym, xs+7*width/8, ym+eyes);
 226   MoveToEx(c->hDC, xs+width/8, ys+3*h/4-eyes, NULL);
 227   LineTo(c->hDC, xs+width/8, ys+3*h/4);
 228   LineTo(c->hDC, xs+7*width/8, ys+3*h/4);
 229   LineTo(c->hDC, xs+7*width/8, ys+3*h/4-eyes);
 230   if (selected)
 231   {
 232     /* descent is usually (always?) 0 for graphics */
 233     PatBlt(c->hDC, x, y-run->nAscent, sz.cx, run->nAscent+run->nDescent, DSTINVERT);
 234   }
 235 }
 236
 237 static void ME_DrawRun(ME_Context *c, int x, int y, ME_DisplayItem *rundi, ME_Paragraph *para)
 238 {
 239   ME_Run *run = &rundi->member.run;
 240   ME_DisplayItem *start = ME_FindItemBack(rundi, diStartRow);
 241   int runofs = run->nCharOfs+para->nCharOfs;
 242   int nSelFrom, nSelTo;
 243   const WCHAR wszSpace[] = {' ', 0};
 244
 245   if (run->nFlags & MERF_HIDDEN)
 246     return;
 247
 248   ME_GetSelection(c->editor, &nSelFrom, &nSelTo);
 249
 250   /* Draw selected end-of-paragraph mark */
 251   if (run->nFlags & MERF_ENDPARA && runofs >= nSelFrom && runofs < nSelTo)
 252     ME_DrawTextWithStyle(c, x, y, wszSpace, 1, run->style, NULL, 0, 1,
 253                          c->pt.y + start->member.row.nYPos,
 254                          start->member.row.nHeight);
 255
 256   /* you can always comment it out if you need visible paragraph marks */
 257   if (run->nFlags & (MERF_ENDPARA | MERF_TAB | MERF_CELL))
 258     return;
 259
 260   if (run->nFlags & MERF_GRAPHICS)
 261     ME_DrawGraphics(c, x, y, run, para, (runofs >= nSelFrom) && (runofs < nSelTo));
 262   else
 263   {
 264     if (c->editor->cPasswordMask)
 265     {
 266       ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,ME_StrVLen(run->strText));
 267       ME_DrawTextWithStyle(c, x, y,
 268         szMasked->szData, ME_StrVLen(szMasked), run->style, NULL,
 269         nSelFrom-runofs,nSelTo-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 270       ME_DestroyString(szMasked);
 271     }
 272     else
 273       ME_DrawTextWithStyle(c, x, y,
 274         run->strText->szData, ME_StrVLen(run->strText), run->style, NULL,
 275         nSelFrom-runofs,nSelTo-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 276     }
 277 }
 278
 279 COLORREF ME_GetBackColor(const ME_TextEditor *editor)
 280 {
 281 /* Looks like I was seriously confused
 282     return GetSysColor((GetWindowLong(editor->hWnd, GWL_STYLE) & ES_READONLY) ? COLOR_3DFACE: COLOR_WINDOW);
 283 */
 284   if (editor->rgbBackColor == -1)
 285     return GetSysColor(COLOR_WINDOW);
 286   else
 287     return editor->rgbBackColor;
 288 }
 289
 290 void ME_DrawParagraph(ME_Context *c, ME_DisplayItem *paragraph) {
 291   int align = SetTextAlign(c->hDC, TA_BASELINE);
 292   ME_DisplayItem *p;
 293   ME_Run *run;
 294   ME_Paragraph *para = NULL;
 295   RECT rc, rcPara;
 296   int y = c->pt.y;
 297   int height = 0, baseline = 0, no=0, pno = 0;
 298   int xs, xe;
 299   int visible = 0;
 300   int nMargWidth = 0;
 301
 302   c->pt.x = c->rcView.left;
 303   rcPara.left = c->rcView.left;
 304   rcPara.right = c->rcView.right;
 305   for (p = paragraph; p!=paragraph->member.para.next_para; p = p->next) {
 306     switch(p->type) {
 307       case diParagraph:
 308         para = &p->member.para;
 309         break;
 310       case diStartRow:
 311         assert(para);
 312         nMargWidth = (pno==0?para->nFirstMargin:para->nLeftMargin);
 313         xs = c->rcView.left+nMargWidth;
 314         xe = c->rcView.right-para->nRightMargin;
 315         y += height;
 316         rcPara.top = y;
 317         rcPara.bottom = y+p->member.row.nHeight;
 318         visible = RectVisible(c->hDC, &rcPara);
 319         if (visible) {
 320           HBRUSH hbr;
 321           hbr = CreateSolidBrush(ME_GetBackColor(c->editor));
 322           /* left margin */
 323           rc.left = c->rcView.left;
 324           rc.right = c->rcView.left+nMargWidth;
 325           rc.top = y;
 326           rc.bottom = y+p->member.row.nHeight;
 327           FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
 328           /* right margin */
 329           rc.left = xe;
 330           rc.right = c->rcView.right;
 331           FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
 332           rc.left = c->rcView.left+nMargWidth;
 333           rc.right = xe;
 334           FillRect(c->hDC, &rc, hbr);
 335           DeleteObject(hbr);
 336         }
 337         if (me_debug)
 338         {
 339           const WCHAR wszRowDebug[] = {'r','o','w','[','%','d',']',0};
 340           WCHAR buf[128];
 341           POINT pt = c->pt;
 342           wsprintfW(buf, wszRowDebug, no);
 343           pt.y = 12+y;
 344           ME_DebugWrite(c->hDC, &pt, buf);
 345         }
 346
 347         height = p->member.row.nHeight;
 348         baseline = p->member.row.nBaseline;
 349         pno++;
 350         break;
 351       case diRun:
 352         assert(para);
 353         run = &p->member.run;
 354         if (visible && me_debug) {
 355           rc.left = c->rcView.left+run->pt.x;
 356           rc.right = c->rcView.left+run->pt.x+run->nWidth;
 357           rc.top = c->pt.y+run->pt.y;
 358           rc.bottom = c->pt.y+run->pt.y+height;
 359           TRACE("rc = (%d, %d, %d, %d)\n", rc.left, rc.top, rc.right, rc.bottom);
 360           if (run->nFlags & MERF_SKIPPED)
 361             DrawFocusRect(c->hDC, &rc);
 362           else
 363             FrameRect(c->hDC, &rc, GetSysColorBrush(COLOR_GRAYTEXT));
 364         }
 365         if (visible)
 366           ME_DrawRun(c, run->pt.x, c->pt.y+run->pt.y+baseline, p, &paragraph->member.para);
 367         if (me_debug)
 368         {
 369           /* I'm using %ls, hope wsprintfW is not going to use wrong (4-byte) WCHAR version */
 370           const WCHAR wszRunDebug[] = {'[','%','d',':','%','x',']',' ','%','l','s',0};
 371           WCHAR buf[2560];
 372           POINT pt;
 373           pt.x = run->pt.x;
 374           pt.y = c->pt.y + run->pt.y;
 375           wsprintfW(buf, wszRunDebug, no, p->member.run.nFlags, p->member.run.strText->szData);
 376           ME_DebugWrite(c->hDC, &pt, buf);
 377         }
 378         /* c->pt.x += p->member.run.nWidth; */
 379         break;
 380       default:
 381         break;
 382     }
 383     no++;
 384   }
 385   SetTextAlign(c->hDC, align);
 386 }
 387
 388 void ME_ScrollAbs(ME_TextEditor *editor, int absY)
 389 {
 390   ME_Scroll(editor, absY, 1);
 391 }
 392
 393 void ME_ScrollUp(ME_TextEditor *editor, int cy)
 394 {
 395   ME_Scroll(editor, cy, 2);
 396 }
 397
 398 void ME_ScrollDown(ME_TextEditor *editor, int cy)
 399 {
 400   ME_Scroll(editor, cy, 3);
 401 }
 402
 403 void ME_Scroll(ME_TextEditor *editor, int value, int type)
 404 {
 405   SCROLLINFO si;
 406   int nOrigPos, nNewPos, nActualScroll;
 407
 408   nOrigPos = ME_GetYScrollPos(editor);
 409
 410   si.cbSize = sizeof(SCROLLINFO);
 411   si.fMask = SIF_POS;
 412
 413   switch (type)
 414   {
 415     case 1:
 416       /*Scroll absolutly*/
 417       si.nPos = value;
 418       break;
 419     case 2:
 420       /* Scroll up - towards the beginning of the document */
 421       si.nPos = nOrigPos - value;
 422       break;
 423     case 3:
 424       /* Scroll down - towards the end of the document */
 425       si.nPos = nOrigPos + value;
 426       break;
 427     default:
 428       FIXME("ME_Scroll called incorrectly\n");
 429       si.nPos = 0;
 430   }
 431
 432   nNewPos = SetScrollInfo(editor->hWnd, SB_VERT, &si, editor->bRedraw);
 433   nActualScroll = nOrigPos - nNewPos;
 434   if (editor->bRedraw)
 435   {
 436     if (abs(nActualScroll) > editor->sizeWindow.cy)
 437       InvalidateRect(editor->hWnd, NULL, TRUE);
 438     else
 439       ScrollWindowEx(editor->hWnd, 0, nActualScroll, NULL, NULL, NULL, NULL, SW_INVALIDATE);
 440     ME_Repaint(editor);
 441   }
 442
 443   ME_UpdateScrollBar(editor);
 444 }
 445
 446
 447  void ME_UpdateScrollBar(ME_TextEditor *editor)
 448 {
 449   /* Note that this is the only funciton that should ever call SetScrolLInfo
 450    * with SIF_PAGE or SIF_RANGE. SetScrollPos and SetScrollRange should never
 451    * be used at all. */
 452
 453   HWND hWnd;
 454   SCROLLINFO si;
 455   BOOL bScrollBarWasVisible,bScrollBarWillBeVisible;
 456
 457   if (ME_WrapMarkedParagraphs(editor))
 458     FIXME("ME_UpdateScrollBar had to call ME_WrapMarkedParagraphs\n");
 459
 460   hWnd = editor->hWnd;
 461   si.cbSize = sizeof(si);
 462   bScrollBarWasVisible = ME_GetYScrollVisible(editor);
 463   bScrollBarWillBeVisible = editor->nHeight > editor->sizeWindow.cy;
 464
 465   if (bScrollBarWasVisible != bScrollBarWillBeVisible)
 466   {
 467     ShowScrollBar(hWnd, SB_VERT, bScrollBarWillBeVisible);
 468     ME_MarkAllForWrapping(editor);
 469     ME_WrapMarkedParagraphs(editor);
 470   }
 471
 472   si.fMask = SIF_PAGE | SIF_RANGE;
 473   if (GetWindowLongW(hWnd, GWL_STYLE) & ES_DISABLENOSCROLL)
 474     si.fMask |= SIF_DISABLENOSCROLL;
 475
 476   si.nMin = 0;
 477   si.nMax = editor->nTotalLength;
 478
 479   si.nPage = editor->sizeWindow.cy;
 480
 481   TRACE("min=%d max=%d page=%d\n", si.nMin, si.nMax, si.nPage);
 482   SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
 483 }
 484
 485 int ME_GetYScrollPos(ME_TextEditor *editor)
 486 {
 487   SCROLLINFO si;
 488   si.cbSize = sizeof(si);
 489   si.fMask = SIF_POS;
 490   GetScrollInfo(editor->hWnd, SB_VERT, &si);
 491   return si.nPos;
 492 }
 493
 494 BOOL ME_GetYScrollVisible(ME_TextEditor *editor)
 495 { /* Returns true if the scrollbar is visible */
 496   SCROLLBARINFO sbi;
 497   sbi.cbSize = sizeof(sbi);
 498   GetScrollBarInfo(editor->hWnd, OBJID_VSCROLL, &sbi);
 499   return ((sbi.rgstate[0] & STATE_SYSTEM_INVISIBLE) == 0);
 500 }
 501
 502 void ME_EnsureVisible(ME_TextEditor *editor, ME_DisplayItem *pRun)
 503 {
 504   ME_DisplayItem *pRow = ME_FindItemBack(pRun, diStartRow);
 505   ME_DisplayItem *pPara = ME_FindItemBack(pRun, diParagraph);
 506   int y, yrel, yheight, yold;
 507
 508   assert(pRow);
 509   assert(pPara);
 510
 511   y = pPara->member.para.nYPos+pRow->member.row.nYPos;
 512   yheight = pRow->member.row.nHeight;
 513   yold = ME_GetYScrollPos(editor);
 514   yrel = y - yold;
 515
 516   if (y < yold)
 517     ME_ScrollAbs(editor,y);
 518   else if (yrel + yheight > editor->sizeWindow.cy)
 519     ME_ScrollAbs(editor,y+yheight-editor->sizeWindow.cy);
 520 }
 521
 522
 523 void
 524 ME_InvalidateFromOfs(ME_TextEditor *editor, int nCharOfs)
 525 {
 526   RECT rc;
 527   int x, y, height;
 528   ME_Cursor tmp;
 529
 530   ME_RunOfsFromCharOfs(editor, nCharOfs, &tmp.pRun, &tmp.nOffset);
 531   ME_GetCursorCoordinates(editor, &tmp, &x, &y, &height);
 532
 533   rc.left = 0;
 534   rc.top = y;
 535   rc.bottom = y + height;
 536   rc.right = editor->rcFormat.right;
 537   InvalidateRect(editor->hWnd, &rc, FALSE);
 538 }
 539
 540
 541 void
 542 ME_InvalidateSelection(ME_TextEditor *editor)
 543 {
 544   ME_DisplayItem *para1, *para2;
 545   int nStart, nEnd;
 546   int len = ME_GetTextLength(editor);
 547
 548   ME_GetSelection(editor, &nStart, &nEnd);
 549   /* if both old and new selection are 0-char (= caret only), then
 550   there's no (inverted) area to be repainted, neither old nor new */
 551   if (nStart == nEnd && editor->nLastSelStart == editor->nLastSelEnd)
 552     return;
 553   ME_WrapMarkedParagraphs(editor);
 554   ME_GetSelectionParas(editor, &para1, &para2);
 555   assert(para1->type == diParagraph);
 556   assert(para2->type == diParagraph);
 557   /* last selection markers aren't always updated, which means
 558   they can point past the end of the document */
 559   if (editor->nLastSelStart > len)
 560     editor->nLastSelEnd = len;
 561   if (editor->nLastSelEnd > len)
 562     editor->nLastSelEnd = len;
 563
 564   /* if the start part of selection is being expanded or contracted... */
 565   if (nStart < editor->nLastSelStart) {
 566     ME_MarkForPainting(editor, para1, ME_FindItemFwd(editor->pLastSelStartPara, diParagraphOrEnd));
 567   } else
 568   if (nStart > editor->nLastSelStart) {
 569     ME_MarkForPainting(editor, editor->pLastSelStartPara, ME_FindItemFwd(para1, diParagraphOrEnd));
 570   }
 571
 572   /* if the end part of selection is being contracted or expanded... */
 573   if (nEnd < editor->nLastSelEnd) {
 574     ME_MarkForPainting(editor, para2, ME_FindItemFwd(editor->pLastSelEndPara, diParagraphOrEnd));
 575   } else
 576   if (nEnd > editor->nLastSelEnd) {
 577     ME_MarkForPainting(editor, editor->pLastSelEndPara, ME_FindItemFwd(para2, diParagraphOrEnd));
 578   }
 579
 580   ME_InvalidateMarkedParagraphs(editor);
 581   /* remember the last invalidated position */
 582   ME_GetSelection(editor, &editor->nLastSelStart, &editor->nLastSelEnd);
 583   ME_GetSelectionParas(editor, &editor->pLastSelStartPara, &editor->pLastSelEndPara);
 584   assert(editor->pLastSelStartPara->type == diParagraph);
 585   assert(editor->pLastSelEndPara->type == diParagraph);
 586 }
 587
 588 void
 589 ME_QueueInvalidateFromCursor(ME_TextEditor *editor, int nCursor)
 590 {
 591   editor->nInvalidOfs = ME_GetCursorOfs(editor, nCursor);
 592 }
 593
 594
 595 BOOL
 596 ME_SetZoom(ME_TextEditor *editor, int numerator, int denominator)
 597 {
 598   /* TODO: Zoom images and objects */
 599
 600   if (numerator != 0)
 601   {
 602     if (denominator == 0)
 603       return FALSE;
 604     if (1.0 / 64.0 > (float)numerator / (float)denominator
 605         || (float)numerator / (float)denominator > 64.0)
 606       return FALSE;
 607   }
 608
 609   editor->nZoomNumerator = numerator;
 610   editor->nZoomDenominator = denominator;
 611
 612   ME_RewrapRepaint(editor);
 613   return TRUE;
 614 }