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, 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   ME_SendOldNotify(editor, EN_CHANGE);
 121   ME_Repaint(editor);
 122   ME_SendSelChange(editor);
 123 }
 124
 125 void
 126 ME_RewrapRepaint(ME_TextEditor *editor)
 127 {
 128   /* RewrapRepaint should be called whenever the control has changed in
 129    * looks, but not content. Like resizing. */
 130
 131   ME_MarkAllForWrapping(editor);
 132   ME_WrapMarkedParagraphs(editor);
 133   ME_UpdateScrollBar(editor);
 134
 135   ME_Repaint(editor);
 136 }
 137
 138
 139 static void ME_DrawTextWithStyle(ME_Context *c, int x, int y, LPCWSTR szText, int nChars,
 140   ME_Style *s, int *width, int nSelFrom, int nSelTo, int ymin, int cy) {
 141   HDC hDC = c->hDC;
 142   HGDIOBJ hOldFont;
 143   COLORREF rgbOld, rgbBack;
 144   int yOffset = 0, yTwipsOffset = 0;
 145   hOldFont = ME_SelectStyleFont(c->editor, hDC, s);
 146   rgbBack = ME_GetBackColor(c->editor);
 147   if ((s->fmt.dwMask & CFM_LINK) && (s->fmt.dwEffects & CFE_LINK))
 148     rgbOld = SetTextColor(hDC, RGB(0,0,255));
 149   else if ((s->fmt.dwMask & CFM_COLOR) && (s->fmt.dwEffects & CFE_AUTOCOLOR))
 150     rgbOld = SetTextColor(hDC, GetSysColor(COLOR_WINDOWTEXT));
 151   else
 152     rgbOld = SetTextColor(hDC, s->fmt.crTextColor);
 153   if ((s->fmt.dwMask & s->fmt.dwEffects) & CFM_OFFSET) {
 154     yTwipsOffset = s->fmt.yOffset;
 155   }
 156   if ((s->fmt.dwMask & s->fmt.dwEffects) & (CFM_SUPERSCRIPT | CFM_SUBSCRIPT)) {
 157     if (s->fmt.dwEffects & CFE_SUPERSCRIPT) yTwipsOffset = s->fmt.yHeight/3;
 158     if (s->fmt.dwEffects & CFE_SUBSCRIPT) yTwipsOffset = -s->fmt.yHeight/12;
 159   }
 160   if (yTwipsOffset)
 161   {
 162     int numerator = 1;
 163     int denominator = 1;
 164
 165     if (c->editor->nZoomNumerator)
 166     {
 167       numerator = c->editor->nZoomNumerator;
 168       denominator = c->editor->nZoomDenominator;
 169     }
 170     yOffset = yTwipsOffset * GetDeviceCaps(hDC, LOGPIXELSY) * numerator / denominator / 1440;
 171   }
 172   ExtTextOutW(hDC, x, y-yOffset, 0, NULL, szText, nChars, NULL);
 173   if (width) {
 174     SIZE sz;
 175     GetTextExtentPoint32W(hDC, szText, nChars, &sz);
 176     *width = sz.cx;
 177   }
 178   if (nSelFrom < nChars && nSelTo >= 0 && nSelFrom<nSelTo)
 179   {
 180     SIZE sz;
 181     if (nSelFrom < 0) nSelFrom = 0;
 182     if (nSelTo > nChars) nSelTo = nChars;
 183     GetTextExtentPoint32W(hDC, szText, nSelFrom, &sz);
 184     x += sz.cx;
 185     GetTextExtentPoint32W(hDC, szText+nSelFrom, nSelTo-nSelFrom, &sz);
 186
 187     /* Invert selection if not hidden by EM_HIDESELECTION */
 188     if (c->editor->bHideSelection == FALSE)
 189         PatBlt(hDC, x, ymin, sz.cx, cy, DSTINVERT);
 190   }
 191   SetTextColor(hDC, rgbOld);
 192   ME_UnselectStyleFont(c->editor, hDC, s, hOldFont);
 193 }
 194
 195 static void ME_DebugWrite(HDC hDC, POINT *pt, WCHAR *szText) {
 196   int align = SetTextAlign(hDC, TA_LEFT|TA_TOP);
 197   HGDIOBJ hFont = SelectObject(hDC, GetStockObject(DEFAULT_GUI_FONT));
 198   COLORREF color = SetTextColor(hDC, RGB(128,128,128));
 199   TextOutW(hDC, pt->x, pt->y, szText, lstrlenW(szText));
 200   SelectObject(hDC, hFont);
 201   SetTextAlign(hDC, align);
 202   SetTextColor(hDC, color);
 203 }
 204
 205 void ME_DrawGraphics(ME_Context *c, int x, int y, ME_Run *run,
 206                      ME_Paragraph *para, BOOL selected) {
 207   SIZE sz;
 208   int xs, ys, xe, ye, h, ym, width, eyes;
 209   ME_GetGraphicsSize(c->editor, run, &sz);
 210   xs = run->pt.x;
 211   ys = y-sz.cy;
 212   xe = xs+sz.cx;
 213   ye = y;
 214   h = ye-ys;
 215   ym = ys+h/4;
 216   width = sz.cx;
 217   eyes = width/8;
 218   /* draw a smiling face :) */
 219   Ellipse(c->hDC, xs, ys, xe, ye);
 220   Ellipse(c->hDC, xs+width/8, ym, x+width/8+eyes, ym+eyes);
 221   Ellipse(c->hDC, xs+7*width/8-eyes, ym, xs+7*width/8, ym+eyes);
 222   MoveToEx(c->hDC, xs+width/8, ys+3*h/4-eyes, NULL);
 223   LineTo(c->hDC, xs+width/8, ys+3*h/4);
 224   LineTo(c->hDC, xs+7*width/8, ys+3*h/4);
 225   LineTo(c->hDC, xs+7*width/8, ys+3*h/4-eyes);
 226   if (selected)
 227   {
 228     /* descent is usually (always?) 0 for graphics */
 229     PatBlt(c->hDC, x, y-run->nAscent, sz.cx, run->nAscent+run->nDescent, DSTINVERT);
 230   }
 231 }
 232
 233 static void ME_DrawRun(ME_Context *c, int x, int y, ME_DisplayItem *rundi, ME_Paragraph *para)
 234 {
 235   ME_Run *run = &rundi->member.run;
 236   ME_DisplayItem *start = ME_FindItemBack(rundi, diStartRow);
 237   int runofs = run->nCharOfs+para->nCharOfs;
 238   int nSelFrom, nSelTo;
 239   const WCHAR wszSpace[] = {' ', 0};
 240
 241   if (run->nFlags & MERF_HIDDEN)
 242     return;
 243
 244   ME_GetSelection(c->editor, &nSelFrom, &nSelTo);
 245
 246   /* Draw selected end-of-paragraph mark */
 247   if (run->nFlags & MERF_ENDPARA && runofs >= nSelFrom && runofs < nSelTo)
 248     ME_DrawTextWithStyle(c, x, y, wszSpace, 1, run->style, NULL, 0, 1,
 249                          c->pt.y + start->member.row.nYPos,
 250                          start->member.row.nHeight);
 251
 252   /* you can always comment it out if you need visible paragraph marks */
 253   if (run->nFlags & (MERF_ENDPARA | MERF_TAB | MERF_CELL))
 254     return;
 255
 256   if (run->nFlags & MERF_GRAPHICS)
 257     ME_DrawGraphics(c, x, y, run, para, (runofs >= nSelFrom) && (runofs < nSelTo));
 258   else
 259   {
 260     if (c->editor->cPasswordMask)
 261     {
 262       ME_String *szMasked = ME_MakeStringR(c->editor->cPasswordMask,ME_StrVLen(run->strText));
 263       ME_DrawTextWithStyle(c, x, y,
 264         szMasked->szData, ME_StrVLen(szMasked), run->style, NULL,
 265         nSelFrom-runofs,nSelTo-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 266       ME_DestroyString(szMasked);
 267     }
 268     else
 269       ME_DrawTextWithStyle(c, x, y,
 270         run->strText->szData, ME_StrVLen(run->strText), run->style, NULL,
 271         nSelFrom-runofs,nSelTo-runofs, c->pt.y+start->member.row.nYPos, start->member.row.nHeight);
 272     }
 273 }
 274
 275 COLORREF ME_GetBackColor(ME_TextEditor *editor)
 276 {
 277 /* Looks like I was seriously confused
 278     return GetSysColor((GetWindowLong(editor->hWnd, GWL_STYLE) & ES_READONLY) ? COLOR_3DFACE: COLOR_WINDOW);
 279 */
 280   if (editor->rgbBackColor == -1)
 281     return GetSysColor(COLOR_WINDOW);
 282   else
 283     return editor->rgbBackColor;
 284 }
 285
 286 void ME_DrawParagraph(ME_Context *c, ME_DisplayItem *paragraph) {
 287   int align = SetTextAlign(c->hDC, TA_BASELINE);
 288   ME_DisplayItem *p;
 289   ME_Run *run;
 290   ME_Paragraph *para = NULL;
 291   RECT rc, rcPara;
 292   int y = c->pt.y;
 293   int height = 0, baseline = 0, no=0, pno = 0;
 294   int xs, xe;
 295   int visible = 0;
 296   int nMargWidth = 0;
 297
 298   c->pt.x = c->rcView.left;
 299   rcPara.left = c->rcView.left;
 300   rcPara.right = c->rcView.right;
 301   for (p = paragraph; p!=paragraph->member.para.next_para; p = p->next) {
 302     switch(p->type) {
 303       case diParagraph:
 304         para = &p->member.para;
 305         break;
 306       case diStartRow:
 307         assert(para);
 308         nMargWidth = (pno==0?para->nFirstMargin:para->nLeftMargin);
 309         xs = c->rcView.left+nMargWidth;
 310         xe = c->rcView.right-para->nRightMargin;
 311         y += height;
 312         rcPara.top = y;
 313         rcPara.bottom = y+p->member.row.nHeight;
 314         visible = RectVisible(c->hDC, &rcPara);
 315         if (visible) {
 316           HBRUSH hbr;
 317           hbr = CreateSolidBrush(ME_GetBackColor(c->editor));
 318           /* left margin */
 319           rc.left = c->rcView.left;
 320           rc.right = c->rcView.left+nMargWidth;
 321           rc.top = y;
 322           rc.bottom = y+p->member.row.nHeight;
 323           FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
 324           /* right margin */
 325           rc.left = xe;
 326           rc.right = c->rcView.right;
 327           FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
 328           rc.left = c->rcView.left+nMargWidth;
 329           rc.right = xe;
 330           FillRect(c->hDC, &rc, hbr);
 331           DeleteObject(hbr);
 332         }
 333         if (me_debug)
 334         {
 335           const WCHAR wszRowDebug[] = {'r','o','w','[','%','d',']',0};
 336           WCHAR buf[128];
 337           POINT pt = c->pt;
 338           wsprintfW(buf, wszRowDebug, no);
 339           pt.y = 12+y;
 340           ME_DebugWrite(c->hDC, &pt, buf);
 341         }
 342
 343         height = p->member.row.nHeight;
 344         baseline = p->member.row.nBaseline;
 345         pno++;
 346         break;
 347       case diRun:
 348         assert(para);
 349         run = &p->member.run;
 350         if (visible && me_debug) {
 351           rc.left = c->rcView.left+run->pt.x;
 352           rc.right = c->rcView.left+run->pt.x+run->nWidth;
 353           rc.top = c->pt.y+run->pt.y;
 354           rc.bottom = c->pt.y+run->pt.y+height;
 355           TRACE("rc = (%ld, %ld, %ld, %ld)\n", rc.left, rc.top, rc.right, rc.bottom);
 356           if (run->nFlags & MERF_SKIPPED)
 357             DrawFocusRect(c->hDC, &rc);
 358           else
 359             FrameRect(c->hDC, &rc, GetSysColorBrush(COLOR_GRAYTEXT));
 360         }
 361         if (visible)
 362           ME_DrawRun(c, run->pt.x, c->pt.y+run->pt.y+baseline, p, &paragraph->member.para);
 363         if (me_debug)
 364         {
 365           /* I'm using %ls, hope wsprintfW is not going to use wrong (4-byte) WCHAR version */
 366           const WCHAR wszRunDebug[] = {'[','%','d',':','%','x',']',' ','%','l','s',0};
 367           WCHAR buf[2560];
 368           POINT pt;
 369           pt.x = run->pt.x;
 370           pt.y = c->pt.y + run->pt.y;
 371           wsprintfW(buf, wszRunDebug, no, p->member.run.nFlags, p->member.run.strText->szData);
 372           ME_DebugWrite(c->hDC, &pt, buf);
 373         }
 374         /* c->pt.x += p->member.run.nWidth; */
 375         break;
 376       default:
 377         break;
 378     }
 379     no++;
 380   }
 381   SetTextAlign(c->hDC, align);
 382 }
 383
 384 void ME_ScrollAbs(ME_TextEditor *editor, int absY)
 385 {
 386   ME_Scroll(editor, absY, 1);
 387 }
 388
 389 void ME_ScrollUp(ME_TextEditor *editor, int cy)
 390 {
 391   ME_Scroll(editor, cy, 2);
 392 }
 393
 394 void ME_ScrollDown(ME_TextEditor *editor, int cy)
 395 {
 396   ME_Scroll(editor, cy, 3);
 397 }
 398
 399 void ME_Scroll(ME_TextEditor *editor, int value, int type)
 400 {
 401   SCROLLINFO si;
 402   int nOrigPos, nNewPos, nActualScroll;
 403
 404   nOrigPos = ME_GetYScrollPos(editor);
 405
 406   si.cbSize = sizeof(SCROLLINFO);
 407   si.fMask = SIF_POS;
 408
 409   switch (type)
 410   {
 411     case 1:
 412       /*Scroll absolutly*/
 413       si.nPos = value;
 414       break;
 415     case 2:
 416       /* Scroll up - towards the beginning of the document */
 417       si.nPos = nOrigPos - value;
 418       break;
 419     case 3:
 420       /* Scroll down - towards the end of the document */
 421       si.nPos = nOrigPos + value;
 422       break;
 423     default:
 424       FIXME("ME_Scroll called incorrectly\n");
 425       si.nPos = 0;
 426   }
 427
 428   nNewPos = SetScrollInfo(editor->hWnd, SB_VERT, &si, editor->bRedraw);
 429   nActualScroll = nOrigPos - nNewPos;
 430   if (editor->bRedraw)
 431   {
 432     if (abs(nActualScroll) > editor->sizeWindow.cy)
 433       InvalidateRect(editor->hWnd, NULL, TRUE);
 434     else
 435       ScrollWindowEx(editor->hWnd, 0, nActualScroll, NULL, NULL, NULL, NULL, SW_INVALIDATE);
 436     ME_Repaint(editor);
 437   }
 438
 439   ME_UpdateScrollBar(editor);
 440 }
 441
 442
 443  void ME_UpdateScrollBar(ME_TextEditor *editor)
 444 {
 445   /* Note that this is the only funciton that should ever call SetScrolLInfo
 446    * with SIF_PAGE or SIF_RANGE. SetScrollPos and SetScrollRange should never
 447    * be used at all. */
 448
 449   HWND hWnd;
 450   SCROLLINFO si;
 451   BOOL bScrollBarWasVisible,bScrollBarWillBeVisible;
 452
 453   if (ME_WrapMarkedParagraphs(editor))
 454     FIXME("ME_UpdateScrollBar had to call ME_WrapMarkedParagraphs\n");
 455
 456   hWnd = editor->hWnd;
 457   si.cbSize = sizeof(si);
 458   bScrollBarWasVisible = ME_GetYScrollVisible(editor);
 459   bScrollBarWillBeVisible = editor->nTotalLength > editor->sizeWindow.cy;
 460
 461   if (bScrollBarWasVisible != bScrollBarWillBeVisible)
 462   {
 463     ShowScrollBar(hWnd, SB_VERT, bScrollBarWillBeVisible);
 464     ME_MarkAllForWrapping(editor);
 465     ME_WrapMarkedParagraphs(editor);
 466   }
 467
 468   si.fMask = SIF_PAGE | SIF_RANGE;
 469   if (GetWindowLongW(hWnd, GWL_STYLE) & ES_DISABLENOSCROLL)
 470     si.fMask |= SIF_DISABLENOSCROLL;
 471
 472   si.nMin = 0;
 473   si.nMax = editor->nTotalLength;
 474
 475   si.nPage = editor->sizeWindow.cy;
 476
 477   TRACE("min=%d max=%d page=%d\n", si.nMin, si.nMax, si.nPage);
 478   SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
 479 }
 480
 481 int ME_GetYScrollPos(ME_TextEditor *editor)
 482 {
 483   SCROLLINFO si;
 484   si.cbSize = sizeof(si);
 485   si.fMask = SIF_POS;
 486   GetScrollInfo(editor->hWnd, SB_VERT, &si);
 487   return si.nPos;
 488 }
 489
 490 BOOL ME_GetYScrollVisible(ME_TextEditor *editor)
 491 { /* Returns true if the scrollbar is visible */
 492   SCROLLBARINFO sbi;
 493   sbi.cbSize = sizeof(sbi);
 494   GetScrollBarInfo(editor->hWnd, OBJID_VSCROLL, &sbi);
 495   return ((sbi.rgstate[0] & STATE_SYSTEM_INVISIBLE) == 0);
 496 }
 497
 498 void ME_EnsureVisible(ME_TextEditor *editor, ME_DisplayItem *pRun)
 499 {
 500   ME_DisplayItem *pRow = ME_FindItemBack(pRun, diStartRow);
 501   ME_DisplayItem *pPara = ME_FindItemBack(pRun, diParagraph);
 502   int y, yrel, yheight, yold;
 503
 504   assert(pRow);
 505   assert(pPara);
 506
 507   y = pPara->member.para.nYPos+pRow->member.row.nYPos;
 508   yheight = pRow->member.row.nHeight;
 509   yold = ME_GetYScrollPos(editor);
 510   yrel = y - yold;
 511
 512   if (y < yold)
 513     ME_ScrollAbs(editor,y);
 514   else if (yrel + yheight > editor->sizeWindow.cy)
 515     ME_ScrollAbs(editor,y+yheight-editor->sizeWindow.cy);
 516 }
 517
 518
 519 void
 520 ME_InvalidateFromOfs(ME_TextEditor *editor, int nCharOfs)
 521 {
 522   RECT rc;
 523   int x, y, height;
 524   ME_Cursor tmp;
 525
 526   ME_RunOfsFromCharOfs(editor, nCharOfs, &tmp.pRun, &tmp.nOffset);
 527   ME_GetCursorCoordinates(editor, &tmp, &x, &y, &height);
 528
 529   rc.left = 0;
 530   rc.top = y;
 531   rc.bottom = y + height;
 532   rc.right = editor->rcFormat.right;
 533   InvalidateRect(editor->hWnd, &rc, FALSE);
 534 }
 535
 536
 537 void
 538 ME_InvalidateSelection(ME_TextEditor *editor)
 539 {
 540   ME_DisplayItem *para1, *para2;
 541   int nStart, nEnd;
 542   int len = ME_GetTextLength(editor);
 543
 544   ME_GetSelection(editor, &nStart, &nEnd);
 545   /* if both old and new selection are 0-char (= caret only), then
 546   there's no (inverted) area to be repainted, neither old nor new */
 547   if (nStart == nEnd && editor->nLastSelStart == editor->nLastSelEnd)
 548     return;
 549   ME_WrapMarkedParagraphs(editor);
 550   ME_GetSelectionParas(editor, &para1, &para2);
 551   assert(para1->type == diParagraph);
 552   assert(para2->type == diParagraph);
 553   /* last selection markers aren't always updated, which means
 554   they can point past the end of the document */
 555   if (editor->nLastSelStart > len)
 556     editor->nLastSelEnd = len;
 557   if (editor->nLastSelEnd > len)
 558     editor->nLastSelEnd = len;
 559
 560   /* if the start part of selection is being expanded or contracted... */
 561   if (nStart < editor->nLastSelStart) {
 562     ME_MarkForPainting(editor, para1, ME_FindItemFwd(editor->pLastSelStartPara, diParagraphOrEnd));
 563   } else
 564   if (nStart > editor->nLastSelStart) {
 565     ME_MarkForPainting(editor, editor->pLastSelStartPara, ME_FindItemFwd(para1, diParagraphOrEnd));
 566   }
 567
 568   /* if the end part of selection is being contracted or expanded... */
 569   if (nEnd < editor->nLastSelEnd) {
 570     ME_MarkForPainting(editor, para2, ME_FindItemFwd(editor->pLastSelEndPara, diParagraphOrEnd));
 571   } else
 572   if (nEnd > editor->nLastSelEnd) {
 573     ME_MarkForPainting(editor, editor->pLastSelEndPara, ME_FindItemFwd(para2, diParagraphOrEnd));
 574   }
 575
 576   ME_InvalidateMarkedParagraphs(editor);
 577   /* remember the last invalidated position */
 578   ME_GetSelection(editor, &editor->nLastSelStart, &editor->nLastSelEnd);
 579   ME_GetSelectionParas(editor, &editor->pLastSelStartPara, &editor->pLastSelEndPara);
 580   assert(editor->pLastSelStartPara->type == diParagraph);
 581   assert(editor->pLastSelEndPara->type == diParagraph);
 582 }
 583
 584 void
 585 ME_QueueInvalidateFromCursor(ME_TextEditor *editor, int nCursor)
 586 {
 587   editor->nInvalidOfs = ME_GetCursorOfs(editor, nCursor);
 588 }
 589
 590
 591 BOOL
 592 ME_SetZoom(ME_TextEditor *editor, int numerator, int denominator)
 593 {
 594   /* TODO: Zoom images and objects */
 595
 596   if (numerator != 0)
 597   {
 598     if (denominator == 0)
 599       return FALSE;
 600     if (1.0 / 64.0 > (float)numerator / (float)denominator
 601         || (float)numerator / (float)denominator > 64.0)
 602       return FALSE;
 603   }
 604
 605   editor->nZoomNumerator = numerator;
 606   editor->nZoomDenominator = denominator;
 607
 608   ME_RewrapRepaint(editor);
 609   return TRUE;
 610 }