Scroll view & Print preview
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Hi, I am a newbie using MFC. Most program scripts were copied from either books and examples. I encounter a difficulty when I wanna to scroll view and print preview. //====================== void CSLReaderView::OnDraw(CDC* pDC) { CSLReaderDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); // TODO: add draw code for native data here //change the mapping mode pDC->SetMapMode(MM_LOENGLISH); //plot a rectanglar first, height 400 pixels, not shown in the script // display data here pDC->TextOut(100, -500, "RECORDING REPORT"); for (i=0; im_SLDA[i].LAi); pDC->TextOut(100, -540-i*20, s); } CSize docSize(100, 400+(N+10)*20); //doc size CRect rect; //cal page size GetClientRect(&rect); CSize pageSize(rect.right, rect.bottom); CSize lineSize(0, 20); //line size SetScrollSizes(MM_LOENGLISH, docSize, pageSize, lineSize); } void CSLReaderView::OnInitialUpdate() { CScrollView::OnInitialUpdate(); CSize sizeTotal; sizeTotal.cx = sizeTotal.cy = 100; SetScrollSizes(MM_TEXT, sizeTotal); } void CSLReaderView::OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo) { CSLReaderDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); int pageHeight = pDC->GetDeviceCaps(VERTRES); //page height (dots) int logPixelsY = pDC->GetDeviceCaps(LOGPIXELSY); //dots/inch for pt int plotHeight = (int) (4.0*logPixelsY); //rectan->pixels for pt int lineHeight = (int) (0.2*logPixelsY); //line hight->pixels for pt int numPages = (pDoc->m_SLDA.GetSize()*lineHeight + plotHeight) / pageHeight + 1; pInfo ->SetMaxPage(numPages); } void CSLReaderView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) { if (pDC->IsPrinting()) { int pageHeight = pDC->GetDeviceCaps(VERTRES); int OriginY = pageHeight * (pInfo->m_nCurPage-1); pDC->SetViewportOrg(0, -OriginY); } //CScrollView::OnPrepareDC(pDC, pInfo); //CONFLICT 1: if so, print preview can not show the 2nd page //CView::OnPrepareDC(pDC, pInfo); //CONFLICT 2: if so, view can not scroll } The conflict comes from the last two commands OnPrepareDC(), if use only the first, print preview can not show the 2nd page, i.e. all pages are the same. if use only the second, the view can not be scrolled properly in view. Thanks for your time. The code is long but I have no other ways to describe it better. Regards, Nelson:confused: