viewprev.cpp

vc6.0完整版

	m_nZoomOutPages = m_nPages;

	// Just do this to set the status correctly and invalidate
	SetCurrentPage(m_nCurrentPage, TRUE);
}

void CPreviewView::OnNextPage()
{
	SetCurrentPage(m_nCurrentPage + 1, TRUE);
}

void CPreviewView::OnPrevPage()
{
	SetCurrentPage(m_nCurrentPage - 1, TRUE);
}

void CPreviewView::OnPreviewPrint()
{
	OnPreviewClose();               // force close of Preview

	// cause print (can be overridden by catching the command)
	CWnd* pMainWnd = AfxGetThread()->m_pMainWnd;
	ASSERT_VALID(pMainWnd);
	pMainWnd->SendMessage(WM_COMMAND, ID_FILE_PRINT);
}

// Finds page pointed to and convert to 1:1 screen device units
BOOL CPreviewView::FindPageRect(CPoint& point, UINT& nPage)
{
	if (m_nZoomState != ZOOM_OUT)
		point += (CSize)GetDeviceScrollPosition();

	for (nPage = 0; nPage < m_nPages; nPage++)
	{
		if (m_pPageInfo[nPage].rectScreen.PtInRect(point))
		{
			// adjust point for page position
			point -= (CSize)m_pPageInfo[nPage].rectScreen.TopLeft();

			// convert to 1:1
			point.x = MulDiv(point.x, m_pPageInfo[nPage].sizeScaleRatio.cy,
									m_pPageInfo[nPage].sizeScaleRatio.cx);
			point.y = MulDiv(point.y, m_pPageInfo[nPage].sizeScaleRatio.cy,
									m_pPageInfo[nPage].sizeScaleRatio.cx);
			return TRUE;
		}
	}
	return FALSE;
}


void CPreviewView::OnLButtonDown(UINT, CPoint point)
{
	UINT nPage;
	if (!FindPageRect(point, nPage))
		return;                         // Didn't click on a page

	// Set new zoom state
	SetZoomState((m_nZoomState == ZOOM_IN) ? ZOOM_OUT : m_nZoomState + 1,
								nPage, point);
}

void CPreviewView::SetZoomState(UINT nNewState, UINT nPage, CPoint point)
{
	if (m_nZoomState != nNewState)
	{
		m_nZoomState = nNewState;
		DoZoom(nPage, point);
	}
}

void CPreviewView::OnZoomIn()
{
	if (m_nZoomState != ZOOM_IN)
		SetZoomState(m_nZoomState + 1, 0, CPoint(0, 0));
}

void CPreviewView::OnZoomOut()
{
	if (m_nZoomState != ZOOM_OUT)
		SetZoomState(m_nZoomState - 1, 0, CPoint(0, 0));
}

// Actual zoom code.
void CPreviewView::DoZoom(UINT nPage, CPoint point)
{
	if (m_nZoomState == ZOOM_OUT)
	{
		// taking over scroll bars
		m_nPages = m_nZoomOutPages;
		ShowScrollBar(SB_HORZ, FALSE);      //hide the horizontal bar

		BOOL bShowBar = m_pPreviewInfo->GetMaxPage() < 0x8000 &&
			m_pPreviewInfo->GetMaxPage() -
			m_pPreviewInfo->GetMinPage() <= 32767U;

		ShowScrollBar(SB_VERT, bShowBar);       //Show the vertical bar

		if (bShowBar)
		{
			SCROLLINFO info;
			info.fMask = SIF_PAGE|SIF_RANGE;
			info.nMin = m_pPreviewInfo->GetMinPage();
			info.nMax = m_pPreviewInfo->GetMaxPage();
			info.nPage = 1;
			if (!SetScrollInfo(SB_VERT, &info, FALSE))
				SetScrollRange(SB_VERT, info.nMin, info.nMax, FALSE);
		}

		SetCurrentPage(m_nCurrentPage, TRUE);
	}
	else
	{
		m_nPages = 1;       // only one page in zoomed states

		m_pPageInfo[0].sizeZoomOutRatio = m_pPageInfo[nPage].sizeZoomOutRatio;
		m_pPageInfo[0].sizeUnscaled = m_pPageInfo[nPage].sizeUnscaled;

		// Sets the printer page
		SetCurrentPage(m_nCurrentPage + nPage, FALSE);

		SetScaledSize(0);

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

		// convert Hit Point from screen 1:1
		point.x = MulDiv(point.x, pRatio->cx, pRatio->cy);
		point.y = MulDiv(point.y, pRatio->cx, pRatio->cy);

		// Adjust point for page position
		point += (CSize)m_pPageInfo[0].rectScreen.TopLeft();

		// Scroll to center
		CenterOnPoint(point);
	}
}

void CPreviewView::SetCurrentPage(UINT nPage, BOOL bClearRatios)
{
	m_nCurrentPage = nPage;
	if (m_nCurrentPage > m_pPreviewInfo->GetMaxPage())
		m_nCurrentPage = m_pPreviewInfo->GetMaxPage();
	if (m_nCurrentPage < m_pPreviewInfo->GetMinPage())
		m_nCurrentPage = m_pPreviewInfo->GetMinPage();


	if (m_nZoomState == ZOOM_OUT)
		SetScrollPos(SB_VERT, m_nCurrentPage);

	if (bClearRatios)
	{
		// Force Recalc of layout
		for (UINT i = 0; i < m_nMaxPages; i++)
			m_pPageInfo[i].sizeScaleRatio.cx = 0;           // zero scale ratios
	}

	Invalidate(TRUE);
}

void CPreviewView::OnDisplayPageNumber(UINT nPage, UINT nPagesDisplayed)
{
	UINT nEndPage = nPage + nPagesDisplayed - 1;

	CFrameWnd* pParent = (CFrameWnd*)AfxGetThread()->m_pMainWnd;
	ASSERT_VALID(pParent);
	ASSERT_KINDOF(CFrameWnd, pParent);

	int nSubString = (nPagesDisplayed == 1) ? 0 : 1;

	CString s;
	if (AfxExtractSubString(s, m_pPreviewInfo->m_strPageDesc, nSubString))
	{
		TCHAR szBuf[80];
		if (nSubString == 0)
			wsprintf(szBuf, s, nPage);
		else
			wsprintf(szBuf, s, nPage, nEndPage);
		pParent->SendMessage(WM_SETMESSAGESTRING, 0, (LPARAM)(LPVOID)szBuf);
	}
	else
	{
		TRACE1("Malformed Page Description string. Could not get string %d.\n",
			nSubString);
	}
}


void CPreviewView::OnUpdateNumPageChange(CCmdUI* pCmdUI)
{
	// set text of button to opposite of current state
	CString text;
	UINT nPages = m_nZoomState == ZOOM_OUT ? m_nPages : m_nZoomOutPages;
	VERIFY(text.LoadString(nPages == 1 ? AFX_IDS_TWOPAGE : AFX_IDS_ONEPAGE));
	pCmdUI->SetText(text);

	// enable it only if valid to display another page and not zoomed
	pCmdUI->Enable(m_nZoomState == ZOOM_OUT && m_nMaxPages != 1 &&
		(m_pPreviewInfo->GetMaxPage() > 1 || m_nPages > 1));
}

void CPreviewView::OnUpdateNextPage(CCmdUI* pCmdUI)
{
	// enable if not showing last page
	pCmdUI->Enable(m_nCurrentPage+m_nPages-1 < m_pPreviewInfo->GetMaxPage());
}

void CPreviewView::OnUpdatePrevPage(CCmdUI* pCmdUI)
{
	// enable if not showing First page
	pCmdUI->Enable(m_nCurrentPage > m_pPreviewInfo->GetMinPage());
}

void CPreviewView::OnUpdateZoomIn(CCmdUI* pCmdUI)
{
	pCmdUI->Enable(m_nZoomState != ZOOM_IN);
}

void CPreviewView::OnUpdateZoomOut(CCmdUI* pCmdUI)
{
	pCmdUI->Enable(m_nZoomState != ZOOM_OUT);
}

BOOL CPreviewView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
	if (nHitTest != HTCLIENT)
		return CScrollView::OnSetCursor(pWnd, nHitTest, message);

	CPoint point;
	::GetCursorPos(&point);
	ScreenToClient(&point);     // client coordinates of mouse position

	UINT nPage;
	if (m_nZoomState != ZOOM_IN && FindPageRect(point, nPage))
	{                       // On a page and not zoomed all the way in
		if (m_hMagnifyCursor == NULL)
		{
			HINSTANCE hInst = AfxFindResourceHandle(
				MAKEINTRESOURCE(AFX_IDC_MAGNIFY), RT_GROUP_CURSOR);
			m_hMagnifyCursor = ::LoadCursor(hInst,
				MAKEINTRESOURCE(AFX_IDC_MAGNIFY));
		}
		::SetCursor(m_hMagnifyCursor);
	}
	else
	{
		::SetCursor(::LoadCursor(NULL, IDC_ARROW));
	}
	return 0;
}

/////////////////////////////////////////////////////////////////////////////
// CPreviewView diagnostics

#ifdef _DEBUG
void CPreviewView::AssertValid() const
{
	CView::AssertValid();
	ASSERT_VALID(&m_dcPrint);
	if (m_pPreviewDC != NULL)
		ASSERT_VALID(m_pPreviewDC);

	switch (m_nZoomState)
	{
	case ZOOM_OUT:
	case ZOOM_IN:
	case ZOOM_MIDDLE:
		break;
	default:
		ASSERT(FALSE); // unknown zoom state
	}

	switch (m_nMapMode)
	{
	case MM_TEXT:
	case MM_LOMETRIC:
	case MM_HIMETRIC:
	case MM_LOENGLISH:
	case MM_HIENGLISH:
	case MM_TWIPS:
	case MM_ISOTROPIC:
	case MM_ANISOTROPIC:
		break;
	default:
		ASSERT(FALSE); // unknown mapping mode
	}
}

void CPreviewView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);

	dc << "m_pPrintView = " << m_pPrintView;
	dc << "\nm_pOrigView = " << m_pOrigView;
	dc << "\nm_bPageNumDisplayed = " << m_bPageNumDisplayed;
	dc << "\nm_bCenter = " << m_bCenter;
	dc << "\nm_nPages = " << m_nPages;
	dc << "\nm_nCurrentPage " << m_nCurrentPage;
	dc << "\nm_nSecondPageOffset " << m_nSecondPageOffset;
	dc << "\nm_nMaxPages = " << m_nMaxPages;
	dc << "\nm_sizePrinterPPI = " << m_sizePrinterPPI;
	dc << "\nm_ptCenterPoint = " << m_ptCenterPoint;
	dc << "\nm_nZoomState = ";
	switch (m_nZoomState)
	{
	case ZOOM_OUT:
		dc << "ZOOM_OUT";
		break;
	case ZOOM_IN:
		dc << "ZOOM_IN";
		break;
	case ZOOM_MIDDLE:
		dc << "ZOOM_MIDDLE";
		break;
	default:
		dc << "*unknown*";
		break;
	}
	dc << "\nm_nMapMode = ";
	switch (m_nMapMode)
	{
	case MM_TEXT:
		dc << "MM_TEXT";
		break;
	case MM_LOMETRIC:
		dc << "MM_LOMETRIC";
		break;
	case MM_HIMETRIC:
		dc << "MM_HIMETRIC";
		break;
	case MM_LOENGLISH:
		dc << "MM_LOENGLISH";
		break;
	case MM_HIENGLISH:
		dc << "MM_HIENGLISH";
		break;
	case MM_TWIPS:
		dc << "MM_TWIPS";
		break;
	case MM_ISOTROPIC:
		dc << "MM_ISOTROPIC";
		break;
	case MM_ANISOTROPIC:
		dc << "MM_ANISOTROPIC";
		break;
	default:
		dc << "*unknown*";
		break;
	}
	dc << "\nm_dcPrint = " << &m_dcPrint;
	dc << "\nm_pPreviewDC = " << m_pPreviewDC;

	dc << "\n";
}
#endif //_DEBUG

#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif

IMPLEMENT_DYNCREATE(CPreviewView, CScrollView)

/////////////////////////////////////////////////////////////////////////////