ex20view.cpp

来自「一些VC++的经典实例」· C++ 代码 · 共 176 行

// ex20View.cpp : implementation of the CEx20View class
//

#include "stdafx.h"
#include "ex20.h"

#include "ex20Doc.h"
#include "ex20View.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx20View

IMPLEMENT_DYNCREATE(CEx20View, CView)

BEGIN_MESSAGE_MAP(CEx20View, CView)
	//{{AFX_MSG_MAP(CEx20View)
	ON_WM_LBUTTONDOWN()
	ON_WM_RBUTTONDOWN()
	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()

/////////////////////////////////////////////////////////////////////////////
// CEx20View construction/destruction

CEx20View::CEx20View()
{
	// TODO: add construction code here
	m_Ball.top=200;
	m_Ball.bottom=m_Ball.top+40;
	m_Ball.left=300;
	m_Ball.right=m_Ball.left+40;
	m_CurPos.x=(m_Ball.left+m_Ball.right)/2;
	m_CurPos.y=(m_Ball.top+m_Ball.bottom)/2;
}

CEx20View::~CEx20View()
{
}

BOOL CEx20View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx20View drawing

void CEx20View::OnDraw(CDC* pDC)
{
	CEx20Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	CBrush BlueBrush;
	BlueBrush.CreateSolidBrush(RGB(0,0,255));
	pDC->SelectObject(&BlueBrush);
	pDC->Ellipse(&m_Ball);
	pDC->TextOut(0,0,"点击鼠标左键引导小球移动");
	pDC->TextOut(0,30,"点击鼠标右键停止小球移动");
}

/////////////////////////////////////////////////////////////////////////////
// CEx20View printing

BOOL CEx20View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CEx20View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CEx20View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CEx20View diagnostics

#ifdef _DEBUG
void CEx20View::AssertValid() const
{
	CView::AssertValid();
}

void CEx20View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CEx20Doc* CEx20View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CEx20Doc)));
	return (CEx20Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CEx20View message handlers

void CEx20View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CDocument *pDC=GetDocument();

	if(!m_Ball.PtInRect(point))
	{
		m_MousePos=point;
		pDC->UpdateAllViews(NULL);
		m_nTimer=SetTimer(1,50,NULL);
	}

	CView::OnLButtonDown(nFlags, point);
}

void CEx20View::OnRButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CDocument *pDC=GetDocument();
	
	KillTimer(m_nTimer);
	pDC->UpdateAllViews(NULL);

	CView::OnRButtonDown(nFlags, point);
}

void CEx20View::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default
	CDocument *pDC=GetDocument();
	CRect rect;
	GetClientRect(&rect);

	m_CurPos.y+=sign(m_MousePos.y-m_CurPos.y);
	m_CurPos.x+=sign(m_MousePos.x-m_CurPos.x);

	if((m_Ball.left=m_CurPos.x-20)<rect.left)
		m_Ball.left=rect.left;
	if((m_Ball.right=m_CurPos.x+20)>rect.right)
		m_Ball.right=rect.right;
	if((m_Ball.top=m_CurPos.y-20)<rect.top)
		m_Ball.top=rect.top;
	if((m_Ball.bottom=m_CurPos.y+20)>rect.bottom)
		m_Ball.bottom=rect.bottom;

	pDC->UpdateAllViews(NULL);

	CView::OnTimer(nIDEvent);
}

int CEx20View::sign(int a)
{
	if(a>0)
		return 1;
	if(a<0)
		return -1;
	return 0;
}