moveview.cpp

MFC应用程序,利用上下左右方向键,控制窗体中正方形的移动

// MoveView.cpp : implementation of the CMoveView class
//

#include "stdafx.h"
#include "Move.h"

#include "MoveDoc.h"
#include "MoveView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMoveView

IMPLEMENT_DYNCREATE(CMoveView, CView)

BEGIN_MESSAGE_MAP(CMoveView, CView)
	//{{AFX_MSG_MAP(CMoveView)
	ON_WM_KEYDOWN()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CMoveView construction/destruction

CMoveView::CMoveView()
{
	m_x1=50;
	m_y1=50;
	m_x2=100;
	m_y2=100;

	// TODO: add construction code here

}

CMoveView::~CMoveView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMoveView drawing

void CMoveView::OnDraw(CDC* pDC)
{
	CMoveDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	pDC->Rectangle(m_x1,m_y1,m_x2,m_y2);
}

/////////////////////////////////////////////////////////////////////////////
// CMoveView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMoveView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMoveView message handlers

void CMoveView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	CRect rect;
	GetClientRect(&rect);
	switch(nChar)
	{case VK_LEFT:
		if(m_x1>0) {m_x1--;m_x2--;} break;
	case VK_RIGHT:
		if(m_x2<rect.Width()) {m_x1++;m_x2++;} break;
	case VK_UP:
		if(m_y1>0) {m_y1--;m_y2--;} break;
	case VK_DOWN:
		if(m_y2<rect.Height()) {m_y1++;m_y2++;} break;
	}
	Invalidate(); 	//使客户区失效，强制调用OnDraw（），重绘窗口

	CView::OnKeyDown(nChar, nRepCnt, nFlags);
}