viewprev.cpp

vc6.0完整版

{
	m_pToolBar->DestroyWindow();
	m_pToolBar = NULL;

	m_pPreviewInfo->m_nCurPage = m_nCurrentPage;
	m_pOrigView->OnEndPrintPreview(m_pPreviewDC, m_pPreviewInfo,
									CPoint(0, 0), this);
}

#define PREVIEW_MARGIN  8
#define PREVIEW_PAGEGAP 8

// Return is actually the fraction cx/cy. Simply using CSize for convenience
CSize CPreviewView::CalcScaleRatio(CSize screenSize, CSize actualSize)
{
	// Test ratio based on vertical dimension to see if it is the one to use
	int nNum = screenSize.cy;
	int nDen = actualSize.cy;

	// If scaled width too large, choose width as primary dimension
	if (MulDiv(actualSize.cx, nNum, nDen) > screenSize.cx)
	{
		// wrong ratio--base on width
		nNum = screenSize.cx;
		nDen = actualSize.cx;
	}
	CSize ratio(nNum, nDen);
	return ratio;
}

// Position Page...
// Generate a Screen MM_TEXT rectangle to enclose each page.  Dimensions
// of the rectangle must be 1 pixel Above and Left of the top/left corner
// of the page and the rectangle width and height must be THREE pixels
// larger than page in order to provide the correct placement of the
// two pixel border.
//
// This routine is called once for each page with the preview DC set up for
// that page

void CPreviewView::PositionPage(UINT nPage)
{
	CSize windowSize = CalcPageDisplaySize();

	VERIFY(m_dcPrint.Escape(GETPHYSPAGESIZE, 0, NULL,
			(LPVOID)&m_pPageInfo[nPage].sizeUnscaled));

	CSize* pSize = &m_pPageInfo[nPage].sizeUnscaled;

	// Convert page size to screen coordinates
	pSize->cx = MulDiv(pSize->cx, afxData.cxPixelsPerInch, m_sizePrinterPPI.cx);
	pSize->cy = MulDiv(pSize->cy, afxData.cyPixelsPerInch, m_sizePrinterPPI.cy);

	m_pPageInfo[nPage].sizeZoomOutRatio = CalcScaleRatio(windowSize, *pSize);

	SetScaledSize(nPage);
}

CSize CPreviewView::CalcPageDisplaySize()
	// calculate the current page size
	//  set 'm_nSecondPageOffset' to start of second page
	// return size of current page less margins
{
	CSize windowSize, scrollSize;
	GetTrueClientSize(windowSize, scrollSize);

	// subtract out vertical scrollbar if zoomed out and page range is known
	// and there is more than one page.
	if (m_nZoomState == ZOOM_OUT && (m_pPreviewInfo->GetMaxPage() != 0xffff) &&
		(m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() != 0))
		windowSize.cx -= scrollSize.cx;

	m_nSecondPageOffset = (windowSize.cx - PREVIEW_MARGIN) / 2;

	windowSize.cx = (m_nPages == 2) ? (windowSize.cx - 3*PREVIEW_MARGIN) / 2 :
									windowSize.cx - 2*PREVIEW_MARGIN;

	windowSize.cy -= 2*PREVIEW_MARGIN;
	return windowSize;
}

void CPreviewView::SetScaledSize(UINT nPage)
{
	CSize* pSize = &m_pPageInfo[nPage].sizeUnscaled;
	CSize* pRatio = &m_pPageInfo[nPage].sizeScaleRatio;
	CSize* pZoomOutRatio = &m_pPageInfo[nPage].sizeZoomOutRatio;
	CSize windowSize = CalcPageDisplaySize();
	BOOL bPaperLarger = pZoomOutRatio->cx < pZoomOutRatio->cy;
		// whether the paper is larger than the screen, or vice versa

	switch (m_nZoomState)
	{
	case ZOOM_OUT:
		*pRatio = *pZoomOutRatio;
		break;

	case ZOOM_MIDDLE:
		// the middle zoom state is a ratio between cx/cy and
		// 1/1 (or cy/cy).  It is, therefore:
		//
		// (cx + cy)/2
		// -----------
		//     cy
		//
		// if the paper is larger than the screen, or
		//
		// (3*cx - cy)/2
		// -------------
		//      cy
		//
		// if the paper is smaller than the screen.
		if (bPaperLarger)
		{
			pRatio->cy = pZoomOutRatio->cy;
			pRatio->cx = (pZoomOutRatio->cx + pRatio->cy) / 2;
		}
		else
		{
			pRatio->cy = pZoomOutRatio->cy;
			pRatio->cx = (3*pZoomOutRatio->cx - pRatio->cy) / 2;
		}
		break;

	case ZOOM_IN:
		if (bPaperLarger)
			pRatio->cx = pRatio->cy = 1;
		else
		{
			// if the paper is smaller than the screen space we're displaying
			// it in, then using a ratio of 1/1 will result in a smaller image
			// on the screen, not a larger one. To get a larger image in this
			// case we double the zoom out ratio.
			pRatio->cy = pZoomOutRatio->cy;
			pRatio->cx = 2*pZoomOutRatio->cx - pZoomOutRatio->cy;
		}
		break;

	default:
		ASSERT(FALSE);
	}

	// Convert to scaled size
	CSize scaledSize;
	scaledSize.cx = MulDiv(pSize->cx, pRatio->cx, pRatio->cy);
	scaledSize.cy = MulDiv(pSize->cy, pRatio->cx, pRatio->cy);

	CRect* pRect = &m_pPageInfo[nPage].rectScreen;
	pRect->SetRect(PREVIEW_MARGIN, PREVIEW_MARGIN,
				   scaledSize.cx + PREVIEW_MARGIN + 3,
				   scaledSize.cy + PREVIEW_MARGIN + 3);

	if (m_nZoomState == ZOOM_OUT)
	{
		pRect->OffsetRect((windowSize.cx - pRect->Size().cx) / 2 - 1,
						  (windowSize.cy - pRect->Size().cy) / 2 - 1);

		if (nPage == 1)
			pRect->OffsetRect(m_nSecondPageOffset, 0);
	}
	else
	{
		// set up scroll size

		SetScrollSizes(MM_TEXT, pRect->Size() +
				CSize(PREVIEW_MARGIN * 2, PREVIEW_MARGIN * 2), windowSize);
	}
}

// Only use the PrepareDC from CScrollView if we are zoomed in
void CPreviewView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
	ASSERT_VALID(pDC);

	if (m_nZoomState == ZOOM_OUT)
		CView::OnPrepareDC(pDC, pInfo);
	else if (m_pPageInfo[0].sizeScaleRatio.cx != 0)
		CScrollView::OnPrepareDC(pDC, pInfo);
}

BOOL CPreviewView::OnEraseBkgnd(CDC* pDC)
{
	ASSERT_VALID(pDC);

	// Fill background with APPWORKSPACE
	CBrush backBrush(GetSysColor(COLOR_APPWORKSPACE));
	CBrush* pOldBrush = pDC->SelectObject(&backBrush);
	CRect rect;
	pDC->GetClipBox(&rect);     // Erase the area needed

	pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY);
	pDC->SelectObject(pOldBrush);
	return TRUE;
}

void CPreviewView::OnDraw(CDC* pDC)
{
	ASSERT_VALID(pDC);

	// don't do anything if not fully initialized
	if (m_pPrintView == NULL || m_dcPrint.m_hDC == NULL)
		return;

	CPoint ViewportOrg = pDC->GetViewportOrg();

	CPen rectPen;
	rectPen.CreatePen(PS_SOLID, 2, GetSysColor(COLOR_WINDOWFRAME));
	CPen shadowPen;
	shadowPen.CreatePen(PS_SOLID, 3, GetSysColor(COLOR_BTNSHADOW));

	m_pPreviewInfo->m_bContinuePrinting = TRUE;     // do this once each paint

	for (UINT nPage = 0; nPage < m_nPages; nPage++)
	{
		int nSavedState = m_dcPrint.SaveDC();       // Save pristine state of DC

		// Use paint DC for print preview output
		m_pPreviewDC->SetOutputDC(pDC->GetSafeHdc());

		m_pPreviewInfo->m_nCurPage = m_nCurrentPage + nPage;

		// Only call PrepareDC if within page range, otherwise use default
		// rect to draw page rectangle
		if (m_nCurrentPage + nPage <= m_pPreviewInfo->GetMaxPage())
			m_pPrintView->OnPrepareDC(m_pPreviewDC, m_pPreviewInfo);

		// Set up drawing rect to entire page (in logical coordinates)
		m_pPreviewInfo->m_rectDraw.SetRect(0, 0,
			m_pPreviewDC->GetDeviceCaps(HORZRES),
			m_pPreviewDC->GetDeviceCaps(VERTRES));
		m_pPreviewDC->DPtoLP(&m_pPreviewInfo->m_rectDraw);

		// Draw empty page on screen

		pDC->SaveDC();          // save the output dc state

		CSize* pRatio = &m_pPageInfo[nPage].sizeScaleRatio;
		CRect* pRect = &m_pPageInfo[nPage].rectScreen;

		if (pRatio->cx == 0)
		{   // page position has not been determined
			PositionPage(nPage);    // compute page position
			if (m_nZoomState != ZOOM_OUT)
				ViewportOrg = -GetDeviceScrollPosition();
		}

		pDC->SetMapMode(MM_TEXT);   // Page Rectangle is in screen device coords
		pDC->SetViewportOrg(ViewportOrg);
		pDC->SetWindowOrg(0, 0);

		pDC->SelectStockObject(HOLLOW_BRUSH);
		pDC->SelectObject(&rectPen);
		pDC->Rectangle(pRect);

		pDC->SelectObject(&shadowPen);

		pDC->MoveTo(pRect->right + 1, pRect->top + 3);
		pDC->LineTo(pRect->right + 1, pRect->bottom + 1);
		pDC->MoveTo(pRect->left + 3, pRect->bottom + 1);
		pDC->LineTo(pRect->right + 1, pRect->bottom + 1);

		// erase background to white (most paper is white)
		CRect rectFill = *pRect;
		rectFill.left += 1;
		rectFill.top += 1;
		rectFill.right -= 2;
		rectFill.bottom -= 2;
		::FillRect(pDC->m_hDC, rectFill, (HBRUSH)GetStockObject(WHITE_BRUSH));

		pDC->RestoreDC(-1);     // restore to synchronized state

		if (!m_pPreviewInfo->m_bContinuePrinting ||
				m_nCurrentPage + nPage > m_pPreviewInfo->GetMaxPage())
		{
			m_pPreviewDC->ReleaseOutputDC();
			m_dcPrint.RestoreDC(nSavedState);   // restore to untouched state

			// if the first page is not displayable, back up one page
			// but never go below 1
			if (nPage == 0 && m_nCurrentPage > 1)
				SetCurrentPage(m_nCurrentPage - 1, TRUE);
			break;
		}

		// Display page number
		OnDisplayPageNumber(m_nCurrentPage, nPage + 1);

		// Set scale ratio for this page
		m_pPreviewDC->SetScaleRatio(pRatio->cx, pRatio->cy);

		CSize PrintOffset;
		VERIFY(m_pPreviewDC->Escape(GETPRINTINGOFFSET, 0, NULL, (LPVOID)&PrintOffset));
		m_pPreviewDC->PrinterDPtoScreenDP((LPPOINT)&PrintOffset);
		PrintOffset += (CSize)pRect->TopLeft();
		PrintOffset += CSize(1, 1);
		PrintOffset += (CSize)ViewportOrg;  // For Scrolling

		m_pPreviewDC->SetTopLeftOffset(PrintOffset);

		m_pPreviewDC->ClipToPage();
		m_pPrintView->OnPrint(m_pPreviewDC, m_pPreviewInfo);

		m_pPreviewDC->ReleaseOutputDC();

		m_dcPrint.RestoreDC(nSavedState);   // restore to untouched state

	}

	rectPen.DeleteObject();
	shadowPen.DeleteObject();
}

void CPreviewView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	if (m_nZoomState != ZOOM_OUT)
		CScrollView::OnHScroll(nSBCode, nPos, pScrollBar);
}

void CPreviewView::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	if (m_nZoomState != ZOOM_OUT)
	{
		CScrollView::OnVScroll(nSBCode, nPos, pScrollBar);
		return;
	}

	switch (nSBCode)
	{
	case SB_BOTTOM:
		SetCurrentPage(m_pPreviewInfo->GetMaxPage(), TRUE);
		break;

	case SB_TOP:
		SetCurrentPage(m_pPreviewInfo->GetMinPage(), TRUE);
		break;

	case SB_PAGEDOWN:
		SetCurrentPage(m_nCurrentPage +
			(m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() + 9) / 10, TRUE);
		break;

	case SB_PAGEUP:
		SetCurrentPage(m_nCurrentPage -
			(m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() + 9) / 10, TRUE);
		break;

	case SB_LINEDOWN:
		SetCurrentPage(m_nCurrentPage + 1, TRUE);
		break;

	case SB_LINEUP:
		SetCurrentPage(m_nCurrentPage - 1, TRUE);
		break;

	case SB_THUMBPOSITION:
		SetCurrentPage(nPos, TRUE);
		break;
	}
}

void CPreviewView::OnNumPageChange()
{
	ASSERT(m_nPages == 1 || m_nPages == 2);
	m_nPages = 3 - m_nPages;    // Toggle between 1 and 2
	AfxGetApp()->m_nNumPreviewPages = m_nPages;