MFC画文字DrawText,GetTextExtent,GetTextMetrics

// TextView.cpp : implementation of the CTextView class

//



#include "stdafx.h"

#include "Text.h"



#include "TextDoc.h"

#include "TextView.h"



#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif



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

// CTextView



IMPLEMENT_DYNCREATE(CTextView, CView)



BEGIN_MESSAGE_MAP(CTextView, CView)

	//{{AFX_MSG_MAP(CTextView)

	ON_WM_CREATE()

	ON_WM_CHAR()

	ON_WM_LBUTTONDBLCLK()

	ON_WM_TIMER()

	//}}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()



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

// CTextView construction/destruction



CTextView::CTextView()

{

	// TODO: add construction code here

	m_strLine="";

	m_ptStart=CPoint(0,0);	

	m_iWidth=0;

}



CTextView::~CTextView()

{

}



BOOL CTextView::PreCreateWindow(CREATESTRUCT& cs)

{

	// TODO: Modify the Window class or styles here by modifying

	//  the CREATESTRUCT cs



	return CView::PreCreateWindow(cs);

}



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

// CTextView drawing



void CTextView::OnDraw(CDC* pDC)

{

	CTextDoc* pDoc = GetDocument();

	ASSERT_VALID(pDoc);	



	CString str("吴xxabc Hello World");

	pDC->TextOut(0,200,str);

}



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

// CTextView printing



BOOL CTextView::OnPreparePrinting(CPrintInfo* pInfo)

{

	// default preparation

	return DoPreparePrinting(pInfo);

}



void CTextView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)

{

	// TODO: add extra initialization before printing

}



void CTextView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)

{

	// TODO: add cleanup after printing

}



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

// CTextView diagnostics



#ifdef _DEBUG

void CTextView::AssertValid() const

{

	CView::AssertValid();

}



void CTextView::Dump(CDumpContext& dc) const

{

	CView::Dump(dc);

}



CTextDoc* CTextView::GetDocument() // non-debug version is inline

{

	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CTextDoc)));

	return (CTextDoc*)m_pDocument;

}

#endif //_DEBUG



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

// CTextView message handlers



int CTextView::OnCreate(LPCREATESTRUCT lpCreateStruct) 

{

	if (CView::OnCreate(lpCreateStruct) == -1)

		return -1;

	CClientDC dc(this);

	TEXTMETRIC metric;

	dc.GetTextMetrics(&metric);

	//CreateSolidCaret(metric.tmAveCharWidth,metric.tmHeight);

	m_bmpCaret.LoadBitmap(IDB_WU);

	CreateCaret(&m_bmpCaret);

	ShowCaret();	



	SetTimer(1,100,NULL);



	return 0;

}



void CTextView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 

{

	CFont font;

	font.CreatePointFont(300,"华文行楷",NULL);



	CClientDC dc(this);

	CFont *pOldFont = dc.SelectObject(&font);

	if(0x0d==nChar){			//Enter

		TEXTMETRIC mt;

		dc.GetTextMetrics(&mt);

		m_ptStart.y += mt.tmHeight;

		m_strLine.Empty();

	}

	else if(0x08 == nChar){		//BackSpace		

		COLORREF colorOld = dc.SetTextColor( dc.GetBkColor() );

		dc.TextOut(m_ptStart.x,m_ptStart.y,m_strLine);

		m_strLine=m_strLine.Left( m_strLine.GetLength()-1 );

		dc.SetTextColor(colorOld);

	}

	else{

		m_strLine+=nChar;

	}



	dc.TextOut(m_ptStart.x,m_ptStart.y,m_strLine);



	CSize sz = dc.GetTextExtent(m_strLine);

	

	SetCaretPos(CPoint(m_ptStart.x+sz.cx,m_ptStart.y));

	dc.SelectObject( pOldFont );

	CView::OnChar(nChar, nRepCnt, nFlags);

}



void CTextView::OnLButtonDblClk(UINT nFlags, CPoint point) 

{

	SetCaretPos( m_ptStart=point );

	m_strLine.Empty();

	CView::OnLButtonDblClk(nFlags, point);

}



void CTextView::OnTimer(UINT nIDEvent) 

{

	if(nIDEvent==1){

		m_iWidth+=5;

		CClientDC dc(this);

		CString str("吴XXabc Hello World");

		CSize sz = dc.GetTextExtent(str);



		CRect rect(0,200,m_iWidth,200+sz.cy);

		dc.SetTextColor(RGB(0xff,0,0));

		dc.DrawText(str,&rect,DT_LEFT);

	}

	CView::OnTimer(nIDEvent);

}