paint.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

        break;
      case diStartRow:
        assert(para);
        nMargWidth = (pno==0?para->nFirstMargin:para->nLeftMargin);
        xs = c->rcView.left+nMargWidth;
        xe = c->rcView.right-para->nRightMargin;
        y += height;
        rcPara.top = y;
        rcPara.bottom = y+p->member.row.nHeight;
        visible = RectVisible(c->hDC, &rcPara);
        if (visible) {
          HBRUSH hbr;
          hbr = CreateSolidBrush(ME_GetBackColor(c->editor));
          /* left margin */
          rc.left = c->rcView.left;
          rc.right = c->rcView.left+nMargWidth;
          rc.top = y;
          rc.bottom = y+p->member.row.nHeight;
          FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
          /* right margin */
          rc.left = xe;
          rc.right = c->rcView.right;
          FillRect(c->hDC, &rc, hbr/* c->hbrMargin */);
          rc.left = c->rcView.left+nMargWidth;
          rc.right = xe;
          FillRect(c->hDC, &rc, hbr);
          DeleteObject(hbr);
        }
        if (me_debug)
        {
          const WCHAR wszRowDebug[] = {'r','o','w','[','%','d',']',0};
          WCHAR buf[128];
          POINT pt = c->pt;
          wsprintfW(buf, wszRowDebug, no);
          pt.y = 12+y;
          ME_DebugWrite(c->hDC, &pt, buf);
        }
        
        height = p->member.row.nHeight;
        baseline = p->member.row.nBaseline;
        pno++;
        break;
      case diRun:
        assert(para);
        run = &p->member.run;
        if (visible && me_debug) {
          rc.left = c->rcView.left+run->pt.x;
          rc.right = c->rcView.left+run->pt.x+run->nWidth;
          rc.top = c->pt.y+run->pt.y;
          rc.bottom = c->pt.y+run->pt.y+height;
          TRACE("rc = (%d, %d, %d, %d)\n", rc.left, rc.top, rc.right, rc.bottom);
          if (run->nFlags & MERF_SKIPPED)
            DrawFocusRect(c->hDC, &rc);
          else
            FrameRect(c->hDC, &rc, GetSysColorBrush(COLOR_GRAYTEXT));
        }
        if (visible)
          ME_DrawRun(c, run->pt.x, c->pt.y+run->pt.y+baseline, p, &paragraph->member.para);
        if (me_debug)
        {
          /* I'm using %ls, hope wsprintfW is not going to use wrong (4-byte) WCHAR version */
          const WCHAR wszRunDebug[] = {'[','%','d',':','%','x',']',' ','%','l','s',0};
          WCHAR buf[2560];
          POINT pt;
          pt.x = run->pt.x;
          pt.y = c->pt.y + run->pt.y;
          wsprintfW(buf, wszRunDebug, no, p->member.run.nFlags, p->member.run.strText->szData);
          ME_DebugWrite(c->hDC, &pt, buf);
        }
        /* c->pt.x += p->member.run.nWidth; */
        break;
      default:
        break;
    }
    no++;
  }
  SetTextAlign(c->hDC, align);
}

void ME_ScrollAbs(ME_TextEditor *editor, int absY)
{
  ME_Scroll(editor, absY, 1);
}

void ME_ScrollUp(ME_TextEditor *editor, int cy)
{
  ME_Scroll(editor, cy, 2);
}

void ME_ScrollDown(ME_TextEditor *editor, int cy)
{ 
  ME_Scroll(editor, cy, 3);
}

void ME_Scroll(ME_TextEditor *editor, int value, int type)
{
  SCROLLINFO si;
  int nOrigPos, nNewPos, nActualScroll;

  nOrigPos = ME_GetYScrollPos(editor);
  
  si.cbSize = sizeof(SCROLLINFO);
  si.fMask = SIF_POS;
  
  switch (type)
  {
    case 1:
      /*Scroll absolutly*/
      si.nPos = value;
      break;
    case 2:
      /* Scroll up - towards the beginning of the document */
      si.nPos = nOrigPos - value;
      break;
    case 3:
      /* Scroll down - towards the end of the document */
      si.nPos = nOrigPos + value;
      break;
    default:
      FIXME("ME_Scroll called incorrectly\n");
      si.nPos = 0;
  }
  
  nNewPos = SetScrollInfo(editor->hWnd, SB_VERT, &si, editor->bRedraw);
  nActualScroll = nOrigPos - nNewPos;
  if (editor->bRedraw)
  {
    if (abs(nActualScroll) > editor->sizeWindow.cy)
      InvalidateRect(editor->hWnd, NULL, TRUE);
    else
      ScrollWindowEx(editor->hWnd, 0, nActualScroll, NULL, NULL, NULL, NULL, SW_INVALIDATE);
    ME_Repaint(editor);
  }
  
  ME_UpdateScrollBar(editor);
}

 
 void ME_UpdateScrollBar(ME_TextEditor *editor)
{ 
  /* Note that this is the only funciton that should ever call SetScrolLInfo 
   * with SIF_PAGE or SIF_RANGE. SetScrollPos and SetScrollRange should never
   * be used at all. */
  
  HWND hWnd;
  SCROLLINFO si;
  BOOL bScrollBarWasVisible,bScrollBarWillBeVisible;
  
  if (ME_WrapMarkedParagraphs(editor))
    FIXME("ME_UpdateScrollBar had to call ME_WrapMarkedParagraphs\n");
  
  hWnd = editor->hWnd;
  si.cbSize = sizeof(si);
  bScrollBarWasVisible = ME_GetYScrollVisible(editor);
  bScrollBarWillBeVisible = editor->nTotalLength > editor->sizeWindow.cy;
  
  if (bScrollBarWasVisible != bScrollBarWillBeVisible)
  {
    ShowScrollBar(hWnd, SB_VERT, bScrollBarWillBeVisible);
    ME_MarkAllForWrapping(editor);
    ME_WrapMarkedParagraphs(editor);
  }
  
  si.fMask = SIF_PAGE | SIF_RANGE;
  if (GetWindowLongW(hWnd, GWL_STYLE) & ES_DISABLENOSCROLL)
    si.fMask |= SIF_DISABLENOSCROLL;
  
  si.nMin = 0;  
  si.nMax = editor->nTotalLength;
  
  si.nPage = editor->sizeWindow.cy;
     
  TRACE("min=%d max=%d page=%d\n", si.nMin, si.nMax, si.nPage);
  SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
}

int ME_GetYScrollPos(ME_TextEditor *editor)
{
  SCROLLINFO si;
  si.cbSize = sizeof(si);
  si.fMask = SIF_POS;
  GetScrollInfo(editor->hWnd, SB_VERT, &si);
  return si.nPos;
}

BOOL ME_GetYScrollVisible(ME_TextEditor *editor)
{ /* Returns true if the scrollbar is visible */
  SCROLLBARINFO sbi;
  sbi.cbSize = sizeof(sbi);
  GetScrollBarInfo(editor->hWnd, OBJID_VSCROLL, &sbi);
  return ((sbi.rgstate[0] & STATE_SYSTEM_INVISIBLE) == 0);
}

void ME_EnsureVisible(ME_TextEditor *editor, ME_DisplayItem *pRun)
{
  ME_DisplayItem *pRow = ME_FindItemBack(pRun, diStartRow);
  ME_DisplayItem *pPara = ME_FindItemBack(pRun, diParagraph);
  int y, yrel, yheight, yold;
  
  assert(pRow);
  assert(pPara);
  
  y = pPara->member.para.nYPos+pRow->member.row.nYPos;
  yheight = pRow->member.row.nHeight;
  yold = ME_GetYScrollPos(editor);
  yrel = y - yold;
  
  if (y < yold)
    ME_ScrollAbs(editor,y);
  else if (yrel + yheight > editor->sizeWindow.cy) 
    ME_ScrollAbs(editor,y+yheight-editor->sizeWindow.cy);
}


void
ME_InvalidateFromOfs(ME_TextEditor *editor, int nCharOfs)
{
  RECT rc;
  int x, y, height;
  ME_Cursor tmp;

  ME_RunOfsFromCharOfs(editor, nCharOfs, &tmp.pRun, &tmp.nOffset);
  ME_GetCursorCoordinates(editor, &tmp, &x, &y, &height);

  rc.left = 0;
  rc.top = y;
  rc.bottom = y + height;
  rc.right = editor->rcFormat.right;
  InvalidateRect(editor->hWnd, &rc, FALSE);
}


void
ME_InvalidateSelection(ME_TextEditor *editor)
{
  ME_DisplayItem *para1, *para2;
  int nStart, nEnd;
  int len = ME_GetTextLength(editor);

  ME_GetSelection(editor, &nStart, &nEnd);
  /* if both old and new selection are 0-char (= caret only), then
  there's no (inverted) area to be repainted, neither old nor new */
  if (nStart == nEnd && editor->nLastSelStart == editor->nLastSelEnd)
    return;
  ME_WrapMarkedParagraphs(editor);
  ME_GetSelectionParas(editor, &para1, &para2);
  assert(para1->type == diParagraph);
  assert(para2->type == diParagraph);
  /* last selection markers aren't always updated, which means
  they can point past the end of the document */ 
  if (editor->nLastSelStart > len)
    editor->nLastSelEnd = len; 
  if (editor->nLastSelEnd > len)
    editor->nLastSelEnd = len; 
    
  /* if the start part of selection is being expanded or contracted... */
  if (nStart < editor->nLastSelStart) {
    ME_MarkForPainting(editor, para1, ME_FindItemFwd(editor->pLastSelStartPara, diParagraphOrEnd));
  } else 
  if (nStart > editor->nLastSelStart) {
    ME_MarkForPainting(editor, editor->pLastSelStartPara, ME_FindItemFwd(para1, diParagraphOrEnd));
  }

  /* if the end part of selection is being contracted or expanded... */
  if (nEnd < editor->nLastSelEnd) {
    ME_MarkForPainting(editor, para2, ME_FindItemFwd(editor->pLastSelEndPara, diParagraphOrEnd));
  } else 
  if (nEnd > editor->nLastSelEnd) {
    ME_MarkForPainting(editor, editor->pLastSelEndPara, ME_FindItemFwd(para2, diParagraphOrEnd));
  }

  ME_InvalidateMarkedParagraphs(editor);
  /* remember the last invalidated position */
  ME_GetSelection(editor, &editor->nLastSelStart, &editor->nLastSelEnd);
  ME_GetSelectionParas(editor, &editor->pLastSelStartPara, &editor->pLastSelEndPara);
  assert(editor->pLastSelStartPara->type == diParagraph);
  assert(editor->pLastSelEndPara->type == diParagraph);
}

void
ME_QueueInvalidateFromCursor(ME_TextEditor *editor, int nCursor)
{
  editor->nInvalidOfs = ME_GetCursorOfs(editor, nCursor);
}


BOOL
ME_SetZoom(ME_TextEditor *editor, int numerator, int denominator)
{
  /* TODO: Zoom images and objects */

  if (numerator != 0)
  {
    if (denominator == 0)
      return FALSE;
    if (1.0 / 64.0 > (float)numerator / (float)denominator
        || (float)numerator / (float)denominator > 64.0)
      return FALSE;
  }
  
  editor->nZoomNumerator = numerator;
  editor->nZoomDenominator = denominator;
  
  ME_RewrapRepaint(editor);
  return TRUE;
}