docviewview.cpp

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// DocViewView.cpp : implementation of the CDocViewView class
//

#include "stdafx.h"
#include "DocView.h"

#include "DocViewDoc.h"
#include "DocViewView.h"
#include "Line.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDocViewView

IMPLEMENT_DYNCREATE(CDocViewView, CView)

BEGIN_MESSAGE_MAP(CDocViewView, CView)
	//{{AFX_MSG_MAP(CDocViewView)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	ON_WM_CHAR()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CDocViewView construction/destruction

CDocViewView::CDocViewView()
{
	// TODO: add construction code here
	m_nLine = 0;
	m_bMouseDown = false;
	m_hCross = AfxGetApp()->LoadStandardCursor(IDC_CROSS);
	m_hArrow = AfxGetApp()->LoadStandardCursor(IDC_ARROW);

}

CDocViewView::~CDocViewView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CDocViewView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CDocViewView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CDocViewView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CDocViewView message handlers

void CDocViewView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	m_bMouseDown = true;
	m_ptStart = point;
	m_ptOld = point;
	SetCapture();
	CRect rect;
	GetClientRect(&rect);
	ClientToScreen(&rect);
	ClipCursor(&rect);
	SetCursor(m_hCross);		//设置鼠标形状为十字形
	
	CView::OnLButtonDown(nFlags, point);
}

void CDocViewView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// 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_ptStart );
		dc.LineTo( m_ptOld );

		dc.SetROP2( R2_COPYPEN );
		dc.MoveTo( m_ptStart );
		dc.LineTo( point );

		CDocViewDoc *pDoc = GetDocument();           //得到文档类指针
		CLine *pLine = new CLine(m_ptStart,point);   //创建CLine对象
		pDoc->m_LineList.AddTail( (void *) pLine);   //将pLine加入到链表中
	}
	SetCursor(m_hArrow);    //设置鼠标形状为标准箭头形
	
	CView::OnLButtonUp(nFlags, point);
}

void CDocViewView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if( m_bMouseDown )
	{
		CClientDC dc(this);
		dc.SetROP2( R2_NOT );
		dc.MoveTo( m_ptStart );	//这两行代码擦除从起点（鼠标按下点）到
		dc.LineTo( m_ptOld );	//上次鼠标移动到的位置之间的临时线
		dc.MoveTo( m_ptStart );	//
		dc.LineTo( point );		//这两行代码从起点到鼠标当前位置画线
		m_ptOld = point;	//鼠标当前位置在下一次鼠标移动事件看来就是"旧位置"
	}
	CView::OnMouseMove(nFlags, point);
}


void CDocViewView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	CDocViewDoc *pDoc = GetDocument();
 	if(nChar == VK_RETURN)
	{
		pDoc->m_strList.AddTail(m_strDisplay);
		pDoc->m_strLastLine.Empty();
		m_strDisplay.Empty();
		m_nLine++;
	}
	else if(m_strDisplay.GetLength() < 64)
	{
		m_strDisplay += nChar;
		pDoc->m_strLastLine = m_strDisplay;
	}
	CClientDC dc(this);
	TEXTMETRIC tm;
	dc.GetTextMetrics(&tm);
	int nLineHeight = tm.tmHeight + tm.tmExternalLeading;

	dc.TextOut(0, m_nLine * nLineHeight, m_strDisplay);
	
	CView::OnChar(nChar, nRepCnt, nFlags);
}