exam8_1view.cpp

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// Exam8_1View.cpp : implementation of the CExam8_1View class
//

#include "stdafx.h"
#include "Exam8_1.h"

#include "Exam8_1Doc.h"
#include "Exam8_1View.h"

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

/////////////////////////////////////////////////////////////////////////////
// CExam8_1View

IMPLEMENT_DYNCREATE(CExam8_1View, CView)

BEGIN_MESSAGE_MAP(CExam8_1View, CView)
	//{{AFX_MSG_MAP(CExam8_1View)
	ON_WM_CHAR()
	ON_COMMAND(ID_SELECT_FONT, OnSelectFont)
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CExam8_1View construction/destruction

CExam8_1View::CExam8_1View()
{
	// TODO: add construction code here

}

CExam8_1View::~CExam8_1View()
{
	if(pFont)		
		delete pFont;
}

BOOL CExam8_1View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CExam8_1View drawing

void CExam8_1View::OnDraw(CDC* pDC)
{
	CExam8_1Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	//选择字体	
	CFont *oldFont;	
	oldFont=pDC->SelectObject(pFont);
	//计算字的高度和宽度	
	TEXTMETRIC tm;	
	pDC->GetTextMetrics(&tm);	
	lHeight=tm.tmHeight +tm.tmExternalLeading;	
	cWidth=tm.tmAveCharWidth ;	
	int y=0;//设定纵坐标为0	
	POSITION pos;	
	CString line;	
	if(!(pos=pDoc->lines.GetHeadPosition() ))		
		return ;
	//循环输出各文本行	
	while(pos!=NULL)	
	{
		line=pDoc->lines.GetNext(pos);	 
		pDC->TextOut(0,y,line,line.GetLength());
		//更新y坐标，下一行文本行的位置	 
		y+=lHeight;	
	}
	//恢复原来DC所用的字体	
	pDC->SelectObject(pFont); 
}

/////////////////////////////////////////////////////////////////////////////
// CExam8_1View printing

BOOL CExam8_1View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CExam8_1View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CExam8_1View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CExam8_1View diagnostics

#ifdef _DEBUG
void CExam8_1View::AssertValid() const
{
	CView::AssertValid();
}

void CExam8_1View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CExam8_1Doc* CExam8_1View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CExam8_1Doc)));
	return (CExam8_1Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CExam8_1View message handlers

void CExam8_1View::OnInitialUpdate() 
{
	CView::OnInitialUpdate();
	
	// TODO: Add your specialized code here and/or call the base class
	CDC *pDC=GetDC();	
	pFont=new CFont();	
	if(!(pFont->CreateFont (0,0,0,0,FW_NORMAL,FALSE,FALSE,FALSE,
		ANSI_CHARSET,OUT_TT_PRECIS,CLIP_TT_ALWAYS,
		DEFAULT_QUALITY,DEFAULT_PITCH,"courier New")))	  
	{		
		pFont->CreateStockObject (SYSTEM_FONT);	  
	}	
	CFont* oldFont=pDC->SelectObject(pFont);	
	TEXTMETRIC tm;	
	pDC->GetTextMetrics(&tm);	
	lHeight=tm.tmHeight +tm.tmExternalLeading;	
	cWidth=tm.tmAveCharWidth ;	
	pDC->SelectObject(oldFont); 
	
}

void CExam8_1View::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	CExam8_1Doc* pDoc = GetDocument();	
	CClientDC dc(this);
	//选择当前字体    
	CFont *oldFont;	
	oldFont=dc.SelectObject(pFont);CString line("");// 存放编辑器当前字符串	
	POSITION pos=NULL;//字符串链表位置指示	
	if(nChar=='\r')//若是回车增加一行	
	{		
		pDoc->nLineNum++;    
	}	
	else	
	{   
		//按行号返回字符串链表中的位置值		
		pos=pDoc->lines.FindIndex(pDoc->nLineNum);		
		if(!pos)		
		{   //没有找到该行号对应的行，因此是一个空行，加入到字符串链表中
			line+=(char)nChar;		 
			pDoc->lines.AddTail(CString(line));		
		}		
		else		
		{ //当前文本还没有换行结束，将字符加入到行末
			line=pDoc->lines.GetAt(pos);		  
			line+=(char)nChar;		  
			pDoc->lines.SetAt(pos,line);		
		}		
		TEXTMETRIC tm;		
		dc.GetTextMetrics(&tm);
		// 将修改后的文本行显示到屏幕		 
		dc.TextOut(0,(int)pDoc->nLineNum*tm.tmHeight,line,line.GetLength());	
	}	
	pDoc->SetModifiedFlag(TRUE);// 设置文本修改标志	
	dc.SelectObject(oldFont); 
	
	CView::OnChar(nChar, nRepCnt, nFlags);
}

void CExam8_1View::OnSelectFont() 
{
	// TODO: Add your command handler code here
	CFontDialog dlg;	
	if(dlg.DoModal()==IDOK)	
	{ 
		LOGFONT LF;	  
		dlg.GetCurrentFont(&LF);//获取当前字体信息	  
		pFont->DeleteObject();//建立新的字体	  
		pFont->CreateFontIndirect(&LF);	  
		this->Invalidate();	  
		UpdateWindow();	
	}
	
}