dlls/riched20/paint.c

   1 /*
   2  * RichEdit - painting 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "editor.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  24
  25 void ME_PaintContent(ME_TextEditor *editor, HDC hDC, BOOL bOnlyNew, RECT *rcUpdate) {
  26   ME_DisplayItem *item;
  27   ME_Context c;
  28   int yoffset;
  29
  30   editor->nSequence++;
  31   yoffset = ME_GetYScrollPos(editor);
  32   ME_InitContext(&c, editor, hDC);
  33   SetBkMode(hDC, TRANSPARENT);
  34   ME_MoveCaret(editor);
  35   item = editor->pBuffer->pFirst->next;
  36   c.pt.y -= yoffset;
  37   while(item != editor->pBuffer->pLast) {
  38     int ye;
  39     assert(item->type == diParagraph);
  40     ye = c.pt.y + item->member.para.nHeight;
  41     if (!bOnlyNew || (item->member.para.nFlags & MEPF_REPAINT))
  42     {
  43       BOOL bPaint = (rcUpdate == NULL);
  44       if (rcUpdate)
  45         bPaint = c.pt.y<rcUpdate->bottom &&
  46           c.pt.y+item->member.para.nHeight>rcUpdate->top;
  47       if (bPaint)
  48       {
  49         ME_DrawParagraph(&c, item);
  50         if (!rcUpdate || (rcUpdate->top<=c.pt.y && rcUpdate->bottom>=ye))
  51           item->member.para.nFlags &= ~MEPF_REPAINT;
  52       }
  53     }
  54     c.pt.y = ye;
  55     item = item->member.para.next_para;
  56   }
  57   if (c.pt.y<c.rcView.bottom) {
  58     RECT rc;
  59     int xs = c.rcView.left, xe = c.rcView.right;
  60     int ys = c.pt.y, ye = c.rcView.bottom;
  61
  62     if (bOnlyNew)
  63     {
  64       int y1 = editor->nTotalLength-yoffset, y2 = editor->nLastTotalLength-yoffset;
  65       if (y1<y2)
  66         ys = y1, ye = y2+1;
  67       else
  68         ys = ye;
  69     }
  70
  71     if (rcUpdate && ys!=ye)
  72     {
  73       xs = rcUpdate->left, xe = rcUpdate->right;
  74       if (rcUpdate->top > ys)
  75         ys = rcUpdate->top;
  76       if (rcUpdate->bottom < ye)
  77         ye = rcUpdate->bottom;
  78     }
  79
  80     if (ye>ys) {
  81       rc.left = xs;
  82       rc.top = ys;
  83       rc.right = xe;
  84       rc.bottom = ye;
  85       FillRect(hDC, &rc, c.editor->hbrBackground);
  86     }
  87     if (ys == c.pt.y) /* don't overwrite the top bar */
  88       ys++;
  89   }
  90   if (editor->nTotalLength != editor->nLastTotalLength)
  91     ME_SendRequestResize(editor, FALSE);
  92   editor->nLastTotalLength = editor->nTotalLength;
  93   ME_DestroyContext(&c);
  94 }
  95
  96 static void ME_MarkParagraphRange(ME_TextEditor *editor, ME_DisplayItem *p1,
  97                            ME_DisplayItem *p2, int nFlags)
  98 {
  99   ME_DisplayItem *p3;
 100   if (p1 == p2)
 101   {
 102     p1->member.para.nFlags |= nFlags;
 103     return;
 104   }
 105   if (p1->member.para.nCharOfs > p2->member.para.nCharOfs)
 106     p3 = p1, p1 = p2, p2 = p3;
 107
 108   p1->member.para.nFlags |= nFlags;
 109   do {
 110     p1 = p1->member.para.next_para;
 111     p1->member.para.nFlags |= nFlags;
 112   } while (p1 != p2);
 113 }
 114
 115 static void ME_MarkOffsetRange(ME_TextEditor *editor, int from, int to, int nFlags)
 116 {
 117   ME_Cursor c1, c2;
 118   ME_CursorFromCharOfs(editor, from, &c1);
 119   ME_CursorFromCharOfs(editor, to, &c2);
 120
 121   ME_MarkParagraphRange(editor, ME_GetParagraph(c1.pRun), ME_GetParagraph(c2.pRun), nFlags);
 122 }
 123
 124 static void ME_MarkSelectionForRepaint(ME_TextEditor *editor)
 125 {
 126   int from, to, from2, to2, end;
 127
 128   end = ME_GetTextLength(editor);
 129   ME_GetSelection(editor, &from, &to);
 130   from2 = editor->nLastSelStart;
 131   to2 = editor->nLastSelEnd;
 132   if (from<from2) ME_MarkOffsetRange(editor, from, from2, MEPF_REPAINT);
 133   if (from>from2) ME_MarkOffsetRange(editor, from2, from, MEPF_REPAINT);
 134   if (to<to2) ME_MarkOffsetRange(editor, to, to2, MEPF_REPAINT);
 135   if (to>to2) ME_MarkOffsetRange(editor, to2, to, MEPF_REPAINT);
 136
 137   editor->nLastSelStart = from;
 138   editor->nLastSelEnd = to;
 139 }
 140
 141 void ME_Repaint(ME_TextEditor *editor)
 142 {
 143   ME_Cursor *pCursor = &editor->pCursors[0];
 144
 145   ME_MarkSelectionForRepaint(editor);
 146   if (ME_WrapMarkedParagraphs(editor)) {
 147     ME_UpdateScrollBar(editor);
 148   }
 149   if (editor->bRedraw)
 150   {
 151     ME_EnsureVisible(editor, pCursor->pRun);
 152   }
 153 }
 154
 155 void ME_UpdateRepaint(ME_TextEditor *editor)
 156 {
 157 /*
 158   InvalidateRect(editor->hWnd, NULL, TRUE);
 159   */
 160   ME_SendOldNotify(editor, EN_CHANGE);
 161   ME_Repaint(editor);
 162   ME_SendOldNotify(editor, EN_UPDATE);
 163   ME_SendSelChange(editor);
 164 }
 165
 166
 167 void
 168 ME_RewrapRepaint(ME_TextEditor *editor)
 169 {
 170   ME_MarkAllForWrapping(editor);
 171   ME_WrapMarkedParagraphs(editor);
 172   ME_UpdateScrollBar(editor);
 173   ME_Repaint(editor);
 174 }
 175
 176
 177 static void ME_DrawTextWithStyle(ME_Context *c, int x, int y, LPCWSTR szText, int nChars,
 178   ME_Style *s, int *width, int nSelFrom, int nSelTo, int ymin, int cy) {
 179   HDC hDC = c->hDC;
 180   HGDIOBJ hOldFont;
 181   COLORREF rgbOld, rgbBack;
 182   int yOffset = 0, yTwipsOffset = 0;
 183   hOldFont = ME_SelectStyleFont(c->editor, hDC, s);
 184   rgbBack = ME_GetBackColor(c->editor);
 185   if ((s->fmt.dwMask & CFM_COLOR) && (s->fmt.dwEffects & CFE_AUTOCOLOR))
 186     rgbOld = SetTextColor(hDC, GetSysColor(COLOR_WINDOWTEXT));
 187   else
 188     rgbOld = SetTextColor(hDC, s->fmt.crTextColor);
 189   if ((s->fmt.dwMask & s->fmt.dwEffects) & CFM_OFFSET) {
 190     yTwipsOffset = s->fmt.yOffset;
 191   }
 192   if ((s->fmt.dwMask & s->fmt.dwEffects) & (CFM_SUPERSCRIPT | CFM_SUBSCRIPT)) {
 193     if (s->fmt.dwEffects & CFE_SUPERSCRIPT) yTwipsOffset = s->fmt.yHeight/3;
 194     if (s->fmt.dwEffects & CFE_SUBSCRIPT) yTwipsOffset = -s->fmt.yHeight/12;
 195   }
 196   if (yTwipsOffset)
 197   {
 198     int numerator = 1;
 199     int denominator = 1;
 200
 201     if (c->editor->nZoomNumerator)
 202     {
 203       numerator = c->editor->nZoomNumerator;
 204       denominator = c->editor->nZoomDenominator;
 205     }
 206     yOffset = yTwipsOffset * GetDeviceCaps(hDC, LOGPIXELSY) * numerator / denominator / 1440;
 207   }
 208   ExtTextOutW(hDC, x, y-yOffset, 0, NULL, szText, nChars, NULL);
 209   if (width) {
 210     SIZE sz;
 211     GetTextExtentPoint32W(hDC, szText, nChars, &sz);
 212     *width = sz.cx;
 213   }
 214   if (nSelFrom < nChars && nSelTo >= 0 && nSelFrom<nSelTo)
 215   {
 216     SIZE sz;
 217     if (nSelFrom < 0) nSelFrom = 0;
 218     if (nSelTo > nChars) nSelTo = nChars;
 219     GetTextExtentPoint32W(hDC, szText, nSelFrom, &sz);
 220     x += sz.cx;
 221     GetTextExtentPoint32W(hDC, szText+nSelFrom, nSelTo-nSelFrom, &sz);
 222     PatBlt(hDC, x, ymin, sz.cx, cy, DSTINVERT);
 223   }
 224   SetTextColor(hDC, rgbOld);
 225   ME_UnselectStyleFont(c->editor, hDC, s, hOldFont);
 226 }
 227
 228 static void ME_DebugWrite(HDC hDC, POINT *pt, WCHAR *szText) {
 229   int align = SetTextAlign(hDC, TA_LEFT|TA_TOP);
 230   HGDIOBJ hFont = SelectObject(hDC, GetStockObject(DEFAULT_GUI_FONT));
 231   COLORREF color = SetTextColor(hDC, RGB(128,128,128));
 232   TextOutW(hDC, pt->x, pt->y, szText, lstrlenW(szText));
 233   SelectObject(hDC, hFont);
 234   SetTextAlign(hDC, align);
 235   SetTextColor(hDC, color);
 236 }
 237
 238 void ME_DrawGraphics(ME_Context *c, int x, int y, ME_Run *run,
 239                      ME_Paragraph *para, BOOL selected) {
 240   SIZE sz;
 241   int xs, ys, xe, ye, h, ym, width, eyes;
 242   ME_GetGraphicsSize(c->editor, run, &sz);
 243   xs = run->pt.x;
 244   ys = y-sz.cy;
 245   xe = xs+sz.cx;
 246   ye = y;
 247   h = ye-ys;
 248   ym = ys+h/4;
 249   width = sz.cx;
 250   eyes = width/8;
 251   /* draw a smiling face :) */
 252   Ellipse(c->hDC, xs, ys, xe, ye);
 253   Ellipse(c->hDC, xs+width/8, ym, x+width/8+eyes, ym+eyes);
 254   Ellipse(c->hDC, xs+7*width/8-eyes, ym, xs+7*width/8, ym+eyes);
 255   MoveToEx(c->hDC, xs+width/8, ys+3*h/4-eyes, NULL);
 256   LineTo(c->hDC, xs+width/8, ys+3*h/4);
 257   LineTo(c->hDC, xs+7*width/8, ys+3*h/4);
 258   LineTo(c->hDC, xs+7*width/8, ys+3*h/4-eyes);
 259   if (selected)
 260   {
 261     /* descent is usually (always?) 0 for graphics */
 262     PatBlt(c->hDC, x, y-run->nAscent, sz.cx, run->nAscent+run->nDescent, DSTINVERT);
 263   }
 264 }
 265
 266 static void ME_DrawRun(ME_Context *c, int x, int y, ME_DisplayItem *rundi, ME_Paragraph *para) {
 267   ME_Run *run = &rundi->member.run;
 268   int runofs = run->nCharOfs+para->nCharOfs;
 269
 270   /* you can always comment it out if you need visible paragraph marks */
 271   if (run->nFlags & (MERF_ENDPARA|MERF_TAB))
 272     return;
 273   if (run->nFlags & MERF_GRAPHICS) {
 274     int blfrom, blto;
 275     ME_GetSelection(c->editor, &blfrom, &blto);
 276     ME_DrawGraphics(c, x, y, run, para, (runofs >= blfrom) && (runofs < blto));
 277   } else
 278   {
 279     int blfrom, blto;
 280     ME_DisplayItem *start = ME_FindItemBack(rundi, diStartRow);
 281     ME_GetSelection(c->editor, &blfrom, &blto);
 282
 283     ME_DrawTextWithStyle(c, x, y,
 284       run->strText->szData, ME_StrVLen(run->strText), run->style, NULL,
 285         blfrom-runofs, blto-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 286   }
 287 }
 288
 289 COLORREF ME_GetBackColor(ME_TextEditor *editor)
 290 {
 291 /* Looks like I was seriously confused
 292     return GetSysColor((GetWindowLong(editor->hWnd, GWL_STYLE) & ES_READONLY) ? COLOR_3DFACE: COLOR_WINDOW);
 293 */
 294   if (editor->rgbBackColor == -1)
 295     return GetSysColor(COLOR_WINDOW);
 296   else
 297     return editor->rgbBackColor;
 298 }
 299
 300 void ME_DrawParagraph(ME_Context *c, ME_DisplayItem *paragraph) {
 301   int align = SetTextAlign(c->hDC, TA_BASELINE);
 302   ME_DisplayItem *p;
 303   ME_Run *run;
 304   ME_Paragraph *para = NULL;
 305   RECT rc, rcPara;
 306   int y = c->pt.y;
 307   int height = 0, baseline = 0, no=0, pno = 0;
 308   int xs, xe;
 309   int visible = 0;
 310   int nMargWidth = 0;
 311
 312   c->pt.x = c->rcView.left;
 313   rcPara.left = c->rcView.left;
 314   rcPara.right = c->rcView.right;
 315   for (p = paragraph; p!=paragraph->member.para.next_para; p = p->next) {
 316     switch(p->type) {
 317       case diParagraph:
 318         para = &p->member.para;
 319         break;
 320       case diStartRow:
 321         assert(para);
 322         nMargWidth = (pno==0?para->nFirstMargin:para->nLeftMargin);
 323         xs = c->rcView.left+nMargWidth;
 324         xe = c->rcView.right-para->nRightMargin;
 325         y += height;
 326         rcPara.top = y;
 327         rcPara.bottom = y+p->member.row.nHeight;
 328         visible = RectVisible(c->hDC, &rcPara);
 329         if (visible) {
 330           HBRUSH hbr;
 331           hbr = CreateSolidBrush(ME_GetBackColor(c->editor));
 332           /* left margin */
 333           rc.left = c->rcView.left;
 334           rc.right = c->rcView.left+nMargWidth;
 335           rc.top = y;
 336           rc.bottom = y+p->member.row.nHeight;
 337           FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
 338           /* right margin */
 339           rc.left = xe;
 340           rc.right = c->rcView.right;
 341           FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
 342           rc.left = c->rcView.left+nMargWidth;
 343           rc.right = xe;
 344           FillRect(c->hDC, &rc, hbr);
 345           DeleteObject(hbr);
 346         }
 347         if (me_debug)
 348         {
 349           const WCHAR wszRowDebug[] = {'r','o','w','[','%','d',']',0};
 350           WCHAR buf[128];
 351           POINT pt = c->pt;
 352           wsprintfW(buf, wszRowDebug, no);
 353           pt.y = 12+y;
 354           ME_DebugWrite(c->hDC, &pt, buf);
 355         }
 356
 357         height = p->member.row.nHeight;
 358         baseline = p->member.row.nBaseline;
 359         pno++;
 360         break;
 361       case diRun:
 362         assert(para);
 363         run = &p->member.run;
 364         if (visible && me_debug) {
 365           rc.left = c->rcView.left+run->pt.x;
 366           rc.right = c->rcView.left+run->pt.x+run->nWidth;
 367           rc.top = c->pt.y+run->pt.y;
 368           rc.bottom = c->pt.y+run->pt.y+height;
 369           TRACE("rc = (%ld, %ld, %ld, %ld)\n", rc.left, rc.top, rc.right, rc.bottom);
 370           if (run->nFlags & MERF_SKIPPED)
 371             DrawFocusRect(c->hDC, &rc);
 372           else
 373             FrameRect(c->hDC, &rc, GetSysColorBrush(COLOR_GRAYTEXT));
 374         }
 375         if (visible)
 376           ME_DrawRun(c, run->pt.x, c->pt.y+run->pt.y+baseline, p, &paragraph->member.para);
 377         if (me_debug)
 378         {
 379           /* I'm using %ls, hope wsprintfW is not going to use wrong (4-byte) WCHAR version */
 380           const WCHAR wszRunDebug[] = {'[','%','d',':','%','x',']',' ','%','l','s',0};
 381           WCHAR buf[2560];
 382           POINT pt;
 383           pt.x = run->pt.x;
 384           pt.y = c->pt.y + run->pt.y;
 385           wsprintfW(buf, wszRunDebug, no, p->member.run.nFlags, p->member.run.strText->szData);
 386           ME_DebugWrite(c->hDC, &pt, buf);
 387         }
 388         /* c->pt.x += p->member.run.nWidth; */
 389         break;
 390       default:
 391         break;
 392     }
 393     no++;
 394   }
 395   SetTextAlign(c->hDC, align);
 396 }
 397
 398 void ME_Scroll(ME_TextEditor *editor, int cx, int cy)
 399 {
 400   SCROLLINFO si;
 401   HWND hWnd = editor->hWnd;
 402
 403   si.cbSize = sizeof(SCROLLINFO);
 404   si.fMask = SIF_POS;
 405   GetScrollInfo(hWnd, SB_VERT, &si);
 406   si.nPos = editor->nScrollPosY -= cy;
 407   SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
 408   if (editor->bRedraw)
 409   {
 410     if (abs(cy) > editor->sizeWindow.cy)
 411       InvalidateRect(editor->hWnd, NULL, TRUE);
 412     else
 413       ScrollWindowEx(hWnd, cx, cy, NULL, NULL, NULL, NULL, SW_ERASE|SW_INVALIDATE);
 414   }
 415 }
 416
 417 void ME_UpdateScrollBar(ME_TextEditor *editor)
 418 {
 419   HWND hWnd = editor->hWnd;
 420   SCROLLINFO si;
 421   int nOldLen = editor->nTotalLength;
 422   BOOL bScrollY = (editor->nTotalLength > editor->sizeWindow.cy);
 423   BOOL bUpdateScrollBars;
 424   si.cbSize = sizeof(si);
 425   si.fMask = SIF_POS | SIF_RANGE;
 426   GetScrollInfo(hWnd, SB_VERT, &si);
 427   bUpdateScrollBars = (bScrollY || editor->bScrollY)&& ((si.nMax != nOldLen) || (si.nPage != editor->sizeWindow.cy));
 428
 429   if (bScrollY != editor->bScrollY)
 430   {
 431     si.fMask = SIF_RANGE | SIF_PAGE;
 432     si.nMin = 0;
 433     si.nPage = editor->sizeWindow.cy;
 434     if (bScrollY) {
 435       si.nMax = editor->nTotalLength;
 436     } else {
 437       si.nMax = 0;
 438     }
 439     SetScrollInfo(hWnd, SB_VERT, &si, FALSE);
 440     ME_MarkAllForWrapping(editor);
 441     editor->bScrollY = bScrollY;
 442     ME_WrapMarkedParagraphs(editor);
 443     bUpdateScrollBars = TRUE;
 444   }
 445   if (bUpdateScrollBars) {
 446     int nScroll = 0;
 447     si.fMask = SIF_PAGE | SIF_RANGE | SIF_POS;
 448     if (editor->nTotalLength > editor->sizeWindow.cy) {
 449       si.nMax = editor->nTotalLength;
 450       si.nPage = editor->sizeWindow.cy;
 451       if (si.nPos > si.nMax-si.nPage) {
 452         nScroll = (si.nMax-si.nPage)-si.nPos;
 453         si.nPos = si.nMax-si.nPage;
 454       }
 455     }
 456     else {
 457       si.nMax = 0;
 458       si.nPage = 0;
 459       si.nPos = 0;
 460     }
 461     TRACE("min=%d max=%d page=%d pos=%d shift=%d\n", si.nMin, si.nMax, si.nPage, si.nPos, nScroll);
 462     editor->nScrollPosY = si.nPos;
 463     SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
 464     if (nScroll)
 465       ScrollWindow(hWnd, 0, -nScroll, NULL, NULL);
 466   }
 467 }
 468
 469 int ME_GetYScrollPos(ME_TextEditor *editor)
 470 {
 471   return editor->nScrollPosY;
 472 }
 473
 474 void ME_EnsureVisible(ME_TextEditor *editor, ME_DisplayItem *pRun)
 475 {
 476   ME_DisplayItem *pRow = ME_FindItemBack(pRun, diStartRow);
 477   ME_DisplayItem *pPara = ME_FindItemBack(pRun, diParagraph);
 478   int y, yrel, yheight, yold;
 479   HWND hWnd = editor->hWnd;
 480
 481   assert(pRow);
 482   assert(pPara);
 483
 484   y = pPara->member.para.nYPos+pRow->member.row.nYPos;
 485   yheight = pRow->member.row.nHeight;
 486   yold = ME_GetYScrollPos(editor);
 487   yrel = y - yold;
 488   if (yrel < 0) {
 489     editor->nScrollPosY = y;
 490     SetScrollPos(hWnd, SB_VERT, y, TRUE);
 491     if (editor->bRedraw)
 492     {
 493       ScrollWindow(hWnd, 0, -yrel, NULL, NULL);
 494       UpdateWindow(hWnd);
 495     }
 496   } else if (yrel + yheight > editor->sizeWindow.cy) {
 497     int newy = y+yheight-editor->sizeWindow.cy;
 498     editor->nScrollPosY = newy;
 499     SetScrollPos(hWnd, SB_VERT, newy, TRUE);
 500     if (editor->bRedraw)
 501     {
 502       ScrollWindow(hWnd, 0, -(newy-yold), NULL, NULL);
 503       UpdateWindow(hWnd);
 504     }
 505   }
 506 }
 507
 508
 509 void
 510 ME_InvalidateFromOfs(ME_TextEditor *editor, int nCharOfs)
 511 {
 512   RECT rc;
 513   int x, y, height;
 514   ME_Cursor tmp;
 515
 516   ME_RunOfsFromCharOfs(editor, nCharOfs, &tmp.pRun, &tmp.nOffset);
 517   ME_GetCursorCoordinates(editor, &tmp, &x, &y, &height);
 518
 519   rc.left = 0;
 520   rc.top = y;
 521   rc.bottom = y + height;
 522   rc.right = editor->rcFormat.right;
 523   InvalidateRect(editor->hWnd, &rc, FALSE);
 524 }
 525
 526
 527 void
 528 ME_InvalidateSelection(ME_TextEditor *editor)
 529 {
 530   if (ME_IsSelection(editor) || editor->nLastSelStart != editor->nLastSelEnd)
 531   {
 532     int x, y, height;
 533     int x2, y2, height2;
 534     int last_x, last_y, last_height;
 535     int last_x2, last_y2, last_height2;
 536     RECT rc;
 537     ME_Cursor tmp;
 538
 539     ME_GetCursorCoordinates(editor, &editor->pCursors[1], &x, &y, &height);
 540     ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x2, &y2, &height2);
 541     ME_RunOfsFromCharOfs(editor, editor->nLastSelStart, &tmp.pRun, &tmp.nOffset);
 542     ME_GetCursorCoordinates(editor, &tmp, &last_x, &last_y, &last_height);
 543     ME_RunOfsFromCharOfs(editor, editor->nLastSelEnd, &tmp.pRun, &tmp.nOffset);
 544     ME_GetCursorCoordinates(editor, &tmp, &last_x2, &last_y2, &last_height2);
 545     {
 546       rc.left = 0;
 547
 548       rc.top = min(min(y, last_y), min(y2, last_y2));
 549       rc.right = editor->rcFormat.right;
 550       rc.bottom = max(max(y + height, last_y + last_height),
 551                       max(y2 + height2, last_y2 + last_height2));
 552       InvalidateRect(editor->hWnd, &rc, FALSE);
 553     }
 554   }
 555   ME_GetSelection(editor, &editor->nLastSelStart, &editor->nLastSelEnd);
 556 }
 557
 558
 559 void
 560 ME_QueueInvalidateFromCursor(ME_TextEditor *editor, int nCursor)
 561 {
 562   editor->nInvalidOfs = ME_GetCursorOfs(editor, nCursor);
 563 }
 564
 565
 566 BOOL
 567 ME_SetZoom(ME_TextEditor *editor, int numerator, int denominator)
 568 {
 569   /* TODO: Zoom images and objects */
 570
 571   if (numerator != 0)
 572   {
 573     if (denominator == 0)
 574       return FALSE;
 575     if (1.0 / 64.0 > (float)numerator / (float)denominator
 576         || (float)numerator / (float)denominator > 64.0)
 577       return FALSE;
 578   }
 579
 580   editor->nZoomNumerator = numerator;
 581   editor->nZoomDenominator = denominator;
 582
 583   ME_RewrapRepaint(editor);
 584   return TRUE;
 585 }