ex07_2view.cpp

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// Ex07_2View.cpp : implementation of the CEx07_2View class
//

#include "stdafx.h"
#include "Ex07_2.h"

#include "Ex07_2Doc.h"
#include "Ex07_2View.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx07_2View

IMPLEMENT_DYNCREATE(CEx07_2View, CScrollView)

BEGIN_MESSAGE_MAP(CEx07_2View, CScrollView)
	//{{AFX_MSG_MAP(CEx07_2View)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	ON_WM_CHAR()
	//}}AFX_MSG_MAP
	// 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()

/////////////////////////////////////////////////////////////////////////////
// CEx07_2View construction/destruction

CEx07_2View::CEx07_2View()
{
	// TODO: add construction code here
   
	m_bMouseDown=false;
	m_hCursor=AfxGetApp()->LoadStandardCursor(IDC_CROSS);
	m_nLine=0;
}

CEx07_2View::~CEx07_2View()
{
}

BOOL CEx07_2View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx07_2View drawing

void CEx07_2View::OnDraw(CDC* pDC)
{
	CEx07_2Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	pDoc->DrawLine(pDC);
	pDoc->DrawText(pDC);
}

void CEx07_2View::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();

	CSize sizeTotal;
	// TODO: calculate the total size of this view
	sizeTotal.cx = sizeTotal.cy = 100;
	SetScrollSizes(MM_TEXT, sizeTotal);
}

/////////////////////////////////////////////////////////////////////////////
// CEx07_2View printing

BOOL CEx07_2View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CEx07_2View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CEx07_2View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CEx07_2View diagnostics

#ifdef _DEBUG
void CEx07_2View::AssertValid() const
{
	CScrollView::AssertValid();
}

void CEx07_2View::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

CEx07_2Doc* CEx07_2View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CEx07_2Doc)));
	return (CEx07_2Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CEx07_2View message handlers


///鼠标消息函数
void CEx07_2View::OnLButtonDown(UINT nFlags, CPoint point) //鼠标按下
{
	// TODO: Add your message handler code here and/or call default
    m_bMouseDown=true;
	m_StartPt=point;//存放画线的起始位置
	m_OldPt=point;//存放光标的当前位置
	SetCapture();//捕获鼠标
	CRect rect;
	GetClientRect(&rect);//获取视图窗口客户区的坐标
	ClientToScreen(&rect);//转换客户区坐标为屏幕坐标
	ClipCursor(&rect);//将光标限定在视图窗口客户区内


	CScrollView::OnLButtonDown(nFlags, point);
}

void CEx07_2View::OnMouseMove(UINT nFlags, CPoint point) //鼠标移动
{
	// TODO: Add your message handler code here and/or call default
	SetCursor(m_hCursor);//设置鼠标形状为十字形
	if(m_bMouseDown)
	{
		CClientDC dc(this);
		dc.SetROP2(R2_NOT);
		//以下两行代码擦除从起点(鼠标按下点)到赏赐鼠标移动到的位置之间的临时线
		dc.MoveTo(m_StartPt);
		dc.LineTo(m_OldPt);
		//	//以下两行代码玛从起点到鼠标当前位置画线
		dc.MoveTo(m_StartPt);
		dc.LineTo(point);
		m_OldPt=point;//鼠标当前位置为下一次移动的旧位置
	}
	
	CScrollView::OnMouseMove(nFlags, point);
}

void CEx07_2View::OnLButtonUp(UINT nFlags, CPoint point) //释放鼠标
{
	// TODO: Add your message handler code here and/or call default
    if(m_bMouseDown)
	{
		m_bMouseDown=false;
		ReleaseCapture();
		ClipCursor(NULL);
		CClientDC dc(this);
		dc.SetROP2(R2_NOT);
		dc.MoveTo(m_StartPt);
		dc.LineTo(m_OldPt);
		dc.SetROP2(R2_COPYPEN);
		dc.MoveTo(m_StartPt);
		dc.LineTo(point);

		//把信息添加到文档类数据成员m_LineList中
    CEx07_2Doc*pDoc=GetDocument();
	ASSERT_VALID(pDoc);
	CLine*pLine=new CLine(m_StartPt,point);
	pDoc->m_LineList.AddTail((void*)pLine);
	}
	CScrollView::OnLButtonUp(nFlags, point);
}

void CEx07_2View::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
    CEx07_2Doc*pDoc=GetDocument();
	ASSERT_VALID(pDoc);
	if(nChar==VK_RETURN)//回车
	{
		pDoc->m_strList.AddTail(m_strShow);
		m_strShow.Empty();
	    pDoc->m_strLastLine.Empty();
		m_nLine++;
	
	}
		else if(m_strShow.GetLength()<64)
		{
			pDoc->m_strLastLine=m_strShow;
			m_strShow+=nChar;
		}

	
	CClientDC dc(this);
	TEXTMETRIC tm;
	dc.GetTextMetrics(&tm);
	int nLineHeight=tm.tmHeight+tm.tmExternalLeading;
	dc.TextOut(0,m_nLine*nLineHeight,m_strShow);

	CScrollView::OnChar(nChar, nRepCnt, nFlags);
}