hexviewerview.cpp

Visual_C++[1].NET_Bible1 Visual_C++宝典书中的全部源码

// HexViewerView.cpp : implementation of the CHexViewerView class
//

#include "stdafx.h"
#include "HexViewer.h"

#include "HexViewerDoc.h"
#include "HexViewerView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CHexViewerView

IMPLEMENT_DYNCREATE(CHexViewerView, CScrollView)

BEGIN_MESSAGE_MAP(CHexViewerView, CScrollView)
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)
END_MESSAGE_MAP()

// CHexViewerView construction/destruction

CHexViewerView::CHexViewerView()
{
	memset(&m_logfont, 0, sizeof(m_logfont));
 	m_nPointSize = 120;
 	_tcscpy(m_logfont.lfFaceName, _T("Fixedsys"));

	CWindowDC dc(NULL);
	m_logfont.lfHeight = ::MulDiv(m_nPointSize, dc.GetDeviceCaps(LOGPIXELSY), 720);
	m_logfont.lfPitchAndFamily = FIXED_PITCH;

	m_pFont = new CFont;
	m_pFont->CreateFontIndirect(&m_logfont);
}

CHexViewerView::~CHexViewerView()
{
 if (m_pFont != NULL)
 {
  delete m_pFont;
 }
}

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

	return CScrollView::PreCreateWindow(cs);
}

// CHexViewerView drawing

void CHexViewerView::OnDraw(CDC* pDC)
{
	CHexViewerDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	CString strRender;
	CFont*	pOldFont;
	CSize	ScrolledSize;
	int		nStartLine;
	int		nHeight;
	CRect	ScrollRect;
	CPoint	ScrolledPos = GetScrollPosition();

	CRect	rectClient;
	GetClientRect(&rectClient);

	// figure out how high each line is

	pOldFont = pDC->SelectObject(m_pFont);
	nHeight = MeasureFontHeight(m_pFont, pDC);

	// find a starting line based on scrolling

	ScrolledSize = CSize(rectClient.Width(), rectClient.Height());
	ScrollRect = CRect(rectClient.left, ScrolledPos.y,
		rectClient.right,
		ScrolledSize.cy + ScrolledPos.y);
	nStartLine = ScrolledPos.y/16;

	// make sure we are drawing where we should

	ScrollRect.top = nStartLine*nHeight;

	if (pDoc->m_pFile != NULL)
	{

		int nLine;
		for (nLine = nStartLine; ScrollRect.top < ScrollRect.bottom; nLine++)
		{
			if (!pDoc->ReadLine(strRender, 16, nLine*16))
				break;

			nHeight = pDC->DrawText(strRender, -1,
				&ScrollRect, DT_TOP | DT_NOPREFIX | DT_SINGLELINE);
			ScrollRect.top += nHeight;
		}
	}

	pDC->SelectObject(pOldFont);
}

void CHexViewerView::OnInitialUpdate() 
{
	CHexViewerDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	CSize sizeTotal(0, pDoc->m_lFileSize);
	SetScrollSizes(MM_TEXT, sizeTotal);
	
	CScrollView::OnInitialUpdate();
}


// CHexViewerView printing

BOOL CHexViewerView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CHexViewerView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CHexViewerView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}


// CHexViewerView diagnostics

#ifdef _DEBUG
void CHexViewerView::AssertValid() const
{
	CScrollView::AssertValid();
}

void CHexViewerView::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

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


// CHexViewerView message handlers
int CHexViewerView::MeasureFontHeight(CFont* pFont, CDC* pDC)
{ 
	// how tall is the identified font in the identified DC?

	CFont* pOldFont;
	pOldFont = pDC->SelectObject(pFont);

	CRect rectDummy;
 	CString strRender = _T("1234567890ABCDEF- ");
	int nHeight = pDC->DrawText(strRender, -1, rectDummy,
		DT_TOP | DT_SINGLELINE | DT_CALCRECT);
	pDC->SelectObject(pOldFont);

	return nHeight;
}