C++ TDC::GetTextMetrics方法代码示例

//
/// Retrieves information about this font when selected in the specified dc.
//
void
TFont::GetTextMetrics(TEXTMETRIC& tm, TDC& dc) const
{
  dc.SelectObject(*this);
  dc.GetTextMetrics(tm);
  dc.RestoreFont();
}

void TFuncSpecView::Paint(TDC& dc, bool erase, TRect& rect)
{
  TSwitchMinApp* theApp = TYPESAFE_DOWNCAST(GetApplication(), TSwitchMinApp);
  if (theApp) {
    // Only paint if we're printing and we have something to paint, otherwise do nothing.
    //
    if (theApp->Printing && theApp->Printer && !rect.IsEmpty()) {
      // Use pageSize to get the size of the window to render into.  For a Window it's the client area,
      // for a printer it's the printer DC dimensions and for print preview it's the layout window.
      //
      TSize   pageSize(rect.right - rect.left, rect.bottom - rect.top);

      TPrintDialog::TData& printerData = theApp->Printer->GetSetup();

      // Get area we can draw in
      TRect drawingArea(swdoc->PaintHeader(dc, rect, "", 0, 0, false), rect.BottomRight());

      TEXTMETRIC tm;
      dc.SelectObject(TFont("Arial", -12));
      if (!dc.GetTextMetrics(tm)) {
        dc.SelectObject(TFont("Arial", -12));
        dc.GetTextMetrics(tm);
      }
      int fHeight=tm.tmHeight+tm.tmExternalLeading;

      unsigned long inputs=swdoc->GetSystem()->GetInputs();

      XPosVector xpos;
      uint divider;
      char* data;

      Print_CreateWidths(xpos, divider, dc);
      if (xpos.back().x < rect.Size().cx) {  // put space in structure to stretch across page
        uint spacing=(rect.Size().cx - xpos.back().x)/(xpos.size()+1);
        uint space_inc=spacing;
        for(XPosVector::size_type i=0; i<xpos.size(); i++) {
          if (i==inputs) {  // after inputs section, increase divider
            divider += space_inc;
            space_inc += spacing;
          }
          xpos[i].x += space_inc;
          space_inc += spacing;
        }
      }

      data=new char[xpos.size()];

      unsigned long PagesDown=1+pow(2,inputs)/( (drawingArea.Size().cy/fHeight) - 2);  // 2 lines for header and horz divider
      unsigned long PagesAcross=1+xpos.back().x/drawingArea.Size().cx;
      unsigned long Pages=1+PagesDown*PagesAcross;

      // Compute the number of pages to print.
      //
      printerData.MinPage = 1;
      printerData.MaxPage = Pages;


      int fromPage = printerData.FromPage == -1 ? 1 : printerData.FromPage;
      int toPage = printerData.ToPage == -1 ? 1 : printerData.ToPage;
      int currentPage = fromPage;

      TPoint p;

      dc.SelectObject(TPen(TColor::Black));

      while (currentPage <= toPage) {
        swdoc->PaintHeader(dc, rect, "Specification", currentPage, Pages, true);
        if (currentPage==1) Print_Summary(dc, drawingArea);
        else {
          // Calculate origin of line by page number
            // x
            int col=((currentPage-2) ) % PagesAcross;
            p.x=drawingArea.left - col * drawingArea.Size().cx;
            // y
            int row=floor((currentPage-2)/PagesAcross);
            p.y=drawingArea.top/* - row * drawingArea.Size().cy*/;

          // Calculate starting and ending input states
          CELL_TYPE state, stateEnd;
          state=(row*(drawingArea.Size().cy-fHeight))/fHeight;
          stateEnd=state+(drawingArea.Size().cy-fHeight)/fHeight;
          if (stateEnd >= (pow(2,inputs)-1) ) stateEnd=pow(2,inputs)-1;

          //
          // Draw header and lines

          // Vertical
          if ( ((p.x+divider) > drawingArea.left) && ((p.x+divider)<drawingArea.right) ) {
            dc.MoveTo(p.x+divider, p.y);
            dc.LineTo(p.x+divider, p.y+((stateEnd-state)+3)*fHeight);
          }

          // Labels
          for(XPosVector::size_type i=0; i<xpos.size(); i++)
            dc.TextOut(TPoint(xpos[i].x, p.y), xpos[i].s.c_str());
          p.y += fHeight;

          // Horizontal
          dc.MoveTo(drawingArea.left, p.y + fHeight/2);
          dc.LineTo(p.x+xpos.back().x, p.y + fHeight/2);
//.........这里部分代码省略.........

//
// Paint routine for Window, Printer, and PrintPreview for a TEdit/TListBox client.
//
void poundsMDIChild::Paint (TDC& dc, BOOL, TRect& rect)
{
    poundsApp *theApp = TYPESAFE_DOWNCAST(GetApplication(), poundsApp);
    if (theApp) {
        // Only paint if we're printing and we have something to paint, otherwise do nothing.
        if (theApp->Printing && theApp->Printer && !rect.IsEmpty()) {
            // Use pageSize to get the size of the window to render into.  For a Window it's the client area,
            // for a printer it's the printer DC dimensions and for print preview it's the layout window.
            TSize   pageSize(rect.right - rect.left, rect.bottom - rect.top);

            HFONT   hFont = (HFONT)GetClientWindow()->GetWindowFont();
            TFont   font("Arial", -12);
            if (hFont == 0)
              dc.SelectObject(font);
            else
              dc.SelectObject(TFont(hFont));

            TEXTMETRIC  tm;
            int fHeight = (dc.GetTextMetrics(tm) == TRUE) ? tm.tmHeight + tm.tmExternalLeading : 10;

            // How many lines of this font can we fit on a page.
            int linesPerPage = MulDiv(pageSize.cy, 1, fHeight);
            if (linesPerPage) {
                TPrintDialog::TData &printerData = theApp->Printer->GetSetup();

                int maxPg = 1;

                // Get the client class window (this is the contents we're going to print).
                TEdit *clientEditWindow /* = 0*/;
                TListBox *clientListWindow = 0;
                TWindow *clientUnknownWindow = 0;

                clientEditWindow = TYPESAFE_DOWNCAST(GetClientWindow(), TEdit);
                if (clientEditWindow)
                    maxPg = ((clientEditWindow->GetNumLines() / linesPerPage) + 1.0);
                else {
                    clientListWindow = TYPESAFE_DOWNCAST(GetClientWindow(), TListBox);
                    if (clientListWindow)
                        maxPg = ((clientListWindow->GetCount() / linesPerPage) + 1.0);
                    else
                       clientUnknownWindow = TYPESAFE_DOWNCAST(GetClientWindow(), TWindow);
                }

                // Compute the number of pages to print.
                printerData.MinPage = 1;
                printerData.MaxPage = maxPg;

                // Do the text stuff:
                int     fromPage = printerData.FromPage == -1 ? 1 : printerData.FromPage;
                int     toPage = printerData.ToPage == -1 ? 1 : printerData.ToPage;
                char    buffer[255];
                int     currentPage = fromPage;

                while (currentPage <= toPage) {
                    int startLine = (currentPage - 1) * linesPerPage;
                    int lineIdx = 0;
                    while (lineIdx < linesPerPage) {
                        // If the string is no longer valid then there's nothing more to display.
                        if (clientEditWindow) {
                            if (!clientEditWindow->GetLine(buffer, sizeof(buffer), startLine + lineIdx))
                                break;
                        }
                        else if (clientListWindow) {
                            if (clientListWindow->GetString(buffer, startLine + lineIdx) < 0)
                                break;
                        }
                        else if (clientUnknownWindow) {
                           clientUnknownWindow->Paint(dc, FALSE, rect);
                           break;
                        }
                        dc.TabbedTextOut(TPoint(0, lineIdx * fHeight), buffer, lstrlen(buffer), 0, NULL, 0);
                        lineIdx++;
                    }
                    currentPage++;
                }
            }
        }
    }
}