exam7_4dlg.cpp

接上面那个

// Exam7_4Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Exam7_4.h"
#include "Exam7_4Dlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CExam7_4Dlg dialog

CExam7_4Dlg::CExam7_4Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CExam7_4Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CExam7_4Dlg)
	m_celciur = 0.0;        //使用ClassWizard设置的表示编辑框
	m_fahrentheit = 0.0;    //显示值的成员变量
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_fahrentheit=(m_celciur-32)*5/9;  //计算初始的华氏温度
}

void CExam7_4Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CExam7_4Dlg)
	DDX_Control(pDX, IDC_SCROLLBAR, m_scrollbar);
	DDX_Text(pDX, IDC_CELCIUR, m_celciur);
	DDX_Text(pDX, IDC_FAHRENHEIT, m_fahrentheit);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CExam7_4Dlg, CDialog)
	//{{AFX_MSG_MAP(CExam7_4Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_VSCROLL()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CExam7_4Dlg message handlers

BOOL CExam7_4Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	m_scrollbar.SetScrollRange(-20,40);    //设置滚动条的滚动范围为-20~40
	m_scrollbar.SetScrollPos(0);     //设置滚动条的初始位置	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CExam7_4Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CExam7_4Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CExam7_4Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CExam7_4Dlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	// TODO: Add your message handler code here and/or call default
	int m_position;
	if (pScrollBar=&m_scrollbar)
	{
		switch(nSBCode)
		{
		case SB_THUMBTRACK:   //拖动滚动滑块时
			m_position=nPos;
			m_scrollbar.SetScrollPos(nPos);
			m_celciur=m_position;
			m_fahrentheit=(m_celciur-32)*5/9;
			break;
		case SB_LINEDOWN:    //单击滚动条向下箭头时
			m_position=m_scrollbar.GetScrollPos();
			m_position+=1;
			if(m_position>40)
				m_position=40;
			m_scrollbar.SetScrollPos(m_position);
			m_celciur=m_position;
			m_fahrentheit=(m_celciur-32)*5/9;
			break;
		case SB_LINEUP:     //单击滚动条向上箭头时
			m_position=m_scrollbar.GetScrollPos();
			m_position-=1;
			if(m_position<-20)
				m_position=-20;
			m_scrollbar.SetScrollPos(m_position);
			m_celciur=m_position;
			m_fahrentheit=(m_celciur-32)*5/9;
			break;
		case SB_PAGEDOWN:   //单击向下箭头与滚动块之间区域
			m_position=m_scrollbar.GetScrollPos();
			m_position+=3;
			if(m_position>40)
				m_position=40;
			m_scrollbar.SetScrollPos(m_position);
			m_celciur=m_position;
			m_fahrentheit=(m_celciur-32)*5/9;
			break;
		case SB_PAGEUP:     //单击向上箭头与滚动块之间区域
			m_position=m_scrollbar.GetScrollPos();
			m_position-=3;
			if(m_position<-20)
				m_position=-20;
			m_scrollbar.SetScrollPos(m_position);
			m_celciur=m_position;
			m_fahrentheit=(m_celciur-32)*5/9;
			break;
		}
		UpdateData(false);
	}
	CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}