drawview.cpp

这是MFC经典问答书的光盘内容

// DrawView.cpp : implementation of the CDrawView class
//

#include "stdafx.h"
#include "PrintMono.h"

#include "DrawDoc.h"
#include "DrawView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CDrawView

IMPLEMENT_DYNCREATE(CDrawView, CView)

BEGIN_MESSAGE_MAP(CDrawView, CView)
	//{{AFX_MSG_MAP(CDrawView)
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawView construction/destruction

CDrawView::CDrawView()
{
	// TODO: add construction code here
}

CDrawView::~CDrawView()
{
}

BOOL CDrawView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CDrawView drawing

void CDrawView::OnDraw(CDC* pDC)
{
	CDrawDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	for( int i = 0; i < pDoc->m_Shapes.GetSize(); ++i )
	{
		CShape* pShape = pDoc->m_Shapes.GetAt( i );
		ASSERT_VALID( pShape );
		ASSERT_KINDOF( CShape, pShape );

		pShape->Draw( pDC );
	}
}

/////////////////////////////////////////////////////////////////////////////
// CDrawView diagnostics

#ifdef _DEBUG
void CDrawView::AssertValid() const
{
	CView::AssertValid();
}

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

CDrawDoc* CDrawView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CDrawDoc)));
	return (CDrawDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CDrawView message handlers

void CDrawView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// Convert point to logical coordinates
	CClientDC dc( this );
	OnPrepareDC( &dc );
	dc.DPtoLP( &point );

	// Add new shape to document
	CDrawDoc* pDoc = GetDocument();
	pDoc->AddShape( point );
	
	CView::OnLButtonDown(nFlags, point);
}

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

void CDrawView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) 
{
	CView::OnPrepareDC(pDC, pInfo);

	pDC->SetMapMode( MM_LOMETRIC );
}

/////////////////////////////////////////////////////////////////////////////
// CDrawView printing

BOOL CDrawView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// Compute document page length
	CDrawDoc* pDoc = GetDocument();
	int nPages = pDoc->m_Shapes.GetSize() / ELEMENTS_PER_PAGE;
	if( ( pDoc->m_Shapes.GetSize() % ELEMENTS_PER_PAGE ) > 0 )
	{
		++nPages;
	}

	pInfo->SetMaxPage( nPages );
	
	// default preparation (shows the "Print" dialog box)
	return DoPreparePrinting(pInfo);
}


void CDrawView::OnBeginPrinting(CDC* pDC, CPrintInfo* /*pInfo*/)
{
	// Create special font for printing
	// ...prepare LOGFONT structure
	LOGFONT lf;				// logical font structure
	::ZeroMemory( &lf, sizeof( lf ) );

	// ...12 point Times bold
	lf.lfHeight = - MulDiv( 12, pDC->GetDeviceCaps( LOGPIXELSX ), 72 );
	lf.lfWidth			= 0;
	lf.lfEscapement		= 0;
	lf.lfOrientation	= 0;
	lf.lfWeight			= FW_BOLD;
	lf.lfItalic			= FALSE;
	lf.lfUnderline		= FALSE;
	lf.lfStrikeOut		= FALSE;
	lf.lfCharSet		= DEFAULT_CHARSET;
	lf.lfOutPrecision	= OUT_DEFAULT_PRECIS;
	lf.lfClipPrecision	= CLIP_DEFAULT_PRECIS;
	lf.lfQuality		= DEFAULT_QUALITY;
	lf.lfPitchAndFamily	= VARIABLE_PITCH | FF_ROMAN;

	// ...create printing font
	m_PrintFont.CreateFontIndirect( &lf );
}


void CDrawView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// Release the printing font
	m_PrintFont.DeleteObject();
}


void CDrawView::PrintPageHeader( CDC* pDC, CPrintInfo* pInfo )
{
	CRect& rcPage = pInfo->m_rectDraw;

	// 1 - Prepare page header
	CString strHeader = _T( "Document: " );
	strHeader += GetDocument()->GetPathName();
	CSize sizeHeader = pDC->GetTextExtent( strHeader );

	// 2 - Draw header
	int nCurrentY = rcPage.top - TOP_MARGIN;
	pDC->TextOut( 0, nCurrentY, strHeader );
	nCurrentY -= sizeHeader.cy * 2;

	// 3 - Draw line
	pDC->MoveTo( 0, nCurrentY );
	pDC->LineTo( rcPage.right, nCurrentY );

	// 4 - Adjust remaining printable area
	rcPage.top = nCurrentY;
}


void CDrawView::PrintPageFooter( CDC* pDC, CPrintInfo* pInfo )
{
	CRect& rcPage = pInfo->m_rectDraw;

	// 1 - Prepare page footer
	CString strFooter;
	strFooter.Format( _T( "Page %d of %d" ), pInfo->m_nCurPage, pInfo->GetMaxPage() );
	CSize sizeFooter = pDC->GetTextExtent( strFooter );

	// 2 - Draw line
	int nBottomY = rcPage.bottom + BOTTOM_MARGIN + sizeFooter.cy * 2;
	int nCurrentY = nBottomY;
	pDC->MoveTo( 0, nCurrentY );
	pDC->LineTo( rcPage.right, nCurrentY );
	nCurrentY -= sizeFooter.cy;

	// 3 - Draw footer
	pDC->TextOut(	rcPage.left + ( rcPage.Width() - sizeFooter.cx ) / 2,
					nCurrentY,
					strFooter );

	// 4 - Adjust remaining printable area
	rcPage.bottom = nBottomY;
}


void CDrawView::PrintPageBody( CDC* pDC, CPrintInfo* pInfo )
{
	CFont* pOldFont = pDC->SelectObject( &m_PrintFont );

	// 1 - Compute which elements we will print on this page
	CDrawDoc* pDoc = GetDocument();
	int nStart = ( pInfo->m_nCurPage - 1 ) * ELEMENTS_PER_PAGE;
	int nEnd = min( nStart + ELEMENTS_PER_PAGE, pDoc->m_Shapes.GetSize() );

	// 2 - Print each element
	int nCurrentY = pInfo->m_rectDraw.top - 200;
	for( int i = nStart; i < nEnd; ++i )
	{
		// 3 - Draw shape
		CShape* pShape = pDoc->m_Shapes.GetAt( i );
		pShape->DrawAt( pDC, LEFT_MARGIN, nCurrentY - CShape::HALF_SIZE );

		// 4 - Draw shape name
		CString strName = pShape->GetShapeName();
		pDC->TextOut( LEFT_MARGIN + 200, nCurrentY, strName );
		nCurrentY -= pDC->GetTextExtent( strName ).cy;

		// 5 - Draw coordinates
		CString strCoords;
		strCoords.Format(	_T( "X = %d, Y = %d" ),
							pShape->m_ptCenter.x, pShape->m_ptCenter.y );
		pDC->TextOut( LEFT_MARGIN + 200, nCurrentY, strCoords );
		nCurrentY -= pDC->GetTextExtent( strCoords ).cy;
		
		// 6 - Draw color
		CString strColor;
		strColor.Format(	_T( "( R, G, B ) = ( %d, %d, %d )" ),
							GetRValue( pShape->m_crColor ),
							GetGValue( pShape->m_crColor ),
							GetBValue( pShape->m_crColor ) );
		pDC->TextOut( LEFT_MARGIN + 200, nCurrentY, strColor );
		nCurrentY -= pDC->GetTextExtent( strColor ).cy;

		// 7 - Draw separator line (if needed)
		if( i < nEnd-1 )
		{
			pDC->MoveTo( LEFT_MARGIN-CShape::HALF_SIZE, nCurrentY - 100 );
			pDC->LineTo( 1000, nCurrentY - 100 );
			nCurrentY -= 200;
		}
	}

	// 8 - Cleanup
	pDC->SelectObject( pOldFont );
}


void CDrawView::OnPrint(CDC* pDC, CPrintInfo* pInfo) 
{
	// The PrintPageHeader() and PrintPageFooter() functions
	// *must* be called before PrintPageBody(), because they
	// adjust pInfo->m_rectDraw to take into account the
	// space occupied by the header and footer
	PrintPageHeader( pDC, pInfo );
	PrintPageFooter( pDC, pInfo );

	PrintPageBody( pDC, pInfo );
}