currency calculatordlg.cpp

计算器 英国一个学生写的 代码很适合学习

// Currency CalculatorDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Currency Calculator.h"
#include "Currency.h"
#include "Currency CalculatorDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CCurrencyCalculatorDlg dialog

CCurrencyCalculatorDlg::CCurrencyCalculatorDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCurrencyCalculatorDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCurrencyCalculatorDlg)
	m_curr_or_num = -1;
	m_amount = _T("");
	m_cur_sel = -1;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	last_op = none;
	new_num_flag = false;
	first_num.make_null();
	intermediate_num.make_null();
	result.make_null();
}

void CCurrencyCalculatorDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCurrencyCalculatorDlg)
	DDX_Control(pDX, IDC_CURRENCY, m_radio1);
	DDX_Control(pDX, IDC_LIST1, m_list1);
	DDX_Radio(pDX, IDC_CURRENCY, m_curr_or_num);
	DDX_Text(pDX, IDC_RESULT, m_amount);
	DDX_LBIndex(pDX, IDC_LIST1, m_cur_sel);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCurrencyCalculatorDlg, CDialog)
	//{{AFX_MSG_MAP(CCurrencyCalculatorDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_ADD, OnAdd)
	ON_BN_CLICKED(IDC_CURRENCY, OnCurrency)
	ON_BN_CLICKED(IDC_DIVIDE, OnDivide)
	ON_BN_CLICKED(IDC_EQUAL, OnEqual)
	ON_BN_CLICKED(IDC_MULTIPLY, OnMultiply)
	ON_BN_CLICKED(IDC_NUM0, OnNum0)
	ON_BN_CLICKED(IDC_NUM1, OnNum1)
	ON_BN_CLICKED(IDC_NUM2, OnNum2)
	ON_BN_CLICKED(IDC_NUM3, OnNum3)
	ON_BN_CLICKED(IDC_NUM4, OnNum4)
	ON_BN_CLICKED(IDC_NUM5, OnNum5)
	ON_BN_CLICKED(IDC_NUM6, OnNum6)
	ON_BN_CLICKED(IDC_NUM7, OnNum7)
	ON_BN_CLICKED(IDC_NUM8, OnNum8)
	ON_BN_CLICKED(IDC_NUM9, OnNum9)
	ON_BN_CLICKED(IDC_NUMBER, OnNumber)
	ON_BN_CLICKED(IDC_POINT, OnPoint)
	ON_BN_CLICKED(IDC_SUBTRACT, OnSubtract)
	ON_LBN_SELCHANGE(IDC_LIST1, OnSelchangeList1)
	ON_BN_CLICKED(IDC_CLEAR, OnClear)
	ON_BN_CLICKED(IDC_CLEARALL, OnClearall)
	ON_BN_CLICKED(IDC_BACKSPACE, OnBackspace)
	ON_BN_CLICKED(IDC_About, OnAbout)
	ON_BN_CLICKED(IDC_EXIT, OnExit)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCurrencyCalculatorDlg message handlers

BOOL CCurrencyCalculatorDlg::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

	// set all strings in list box and set default country as initial selection
	CString STRINGS[] = { "American Dollar", "Australian Dollar", "Pound Sterling",
		"European Euro", "Indian Ruppee", "Japanese Yen", "Pakistani Ruppee",
		"Saudi Riyal" };
	CListBox *plist1 = (CListBox *)GetDlgItem( IDC_LIST1 );
	for( int i=0; i<MAX_COUNTRIES; i++ )
		plist1->AddString( STRINGS[i] );
	m_cur_sel = DEFAULT_COUNTRY;
	plist1->SetCurSel( m_cur_sel );

	// set result field to 0
	m_amount = "0 ";
	m_amount += Currency::get_c_letter( DEFAULT_COUNTRY );
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );

	m_curr_or_num = IDC_CURRENCY;
	CWnd::CheckRadioButton( IDC_CURRENCY, IDC_NUMBER, m_curr_or_num );

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CCurrencyCalculatorDlg::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 CCurrencyCalculatorDlg::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 CCurrencyCalculatorDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CCurrencyCalculatorDlg::OnCurrency() 
{	// if not previously checked,
	if( m_curr_or_num!=IDC_CURRENCY )
	{	// check it and up-date result field with currency letter of selected country
		m_curr_or_num = IDC_CURRENCY;
		if( m_amount.Find( ' ' )==-1 )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		m_list1.EnableWindow();			// enable list box
	}
}

void CCurrencyCalculatorDlg::OnNumber() 
{	// if not previously checked,
	if( m_curr_or_num!=IDC_NUMBER )
	{	// check it and up-date result field by removing currency letter
		m_curr_or_num = IDC_NUMBER;
		m_amount = remove_c_letter();
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		m_list1.EnableWindow( false );	// disable list box
	}
}

void CCurrencyCalculatorDlg::OnSelchangeList1() 
{	// save previous selection and up-date currenct selection
	int prev_sel = m_cur_sel;
	m_cur_sel = m_list1.GetCurSel();
	// up-date result field by converting it in currency of current selected country
	m_amount = remove_c_letter();
	double num = atof( m_amount );
	if( num!=0 )
	{
		Currency temp( num, Currency::get_c_letter( COUNTRIES[prev_sel] ) );
		temp = Currency::convert_currency( temp, temp.get_c_letter(),
			Currency::get_c_letter( COUNTRIES[m_cur_sel] ) );
		m_amount = temp.make_string();
	}
	else
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum0() 
{	// remove currency letter if it is currency
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{	// if new number flag is ON, write 0 and return
		m_amount = '0';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;	// make flag OFF
		return;
	}
	// new number flag is OFF, so proceed accordingly
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;		// return if already reached to maximum length
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		return;		// return if first letter is zero and no point exists
	m_amount += '0';	// add zero at end
	if( m_curr_or_num==IDC_CURRENCY )
	{	// add currency letter if it is currency
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}	// up-date result field
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum1() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '1';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;
		return;
	}
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		m_amount.Delete( 0, 1 );
	m_amount += '1';
	if( m_curr_or_num==IDC_CURRENCY )
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum2() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '2';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;
		return;
	}
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		m_amount.Delete( 0, 1 );
	m_amount += '2';
	if( m_curr_or_num==IDC_CURRENCY )
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum3() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '3';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;
		return;
	}
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		m_amount.Delete( 0, 1 );
	m_amount += '3';
	if( m_curr_or_num==IDC_CURRENCY )
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum4() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '4';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;
		return;
	}
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		m_amount.Delete( 0, 1 );
	m_amount += '4';
	if( m_curr_or_num==IDC_CURRENCY )
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum5() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '5';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;
		return;
	}
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		m_amount.Delete( 0, 1 );
	m_amount += '5';
	if( m_curr_or_num==IDC_CURRENCY )
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum6() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '6';
		if( m_curr_or_num==IDC_CURRENCY )
		{
			m_amount += ' ';
			m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
		}
		CWnd::SetDlgItemText( IDC_RESULT, m_amount );
		new_num_flag = false;
		return;
	}
	if( m_amount.GetLength()>=MAX_LENGTH )
		return;
	if( m_amount[0]=='0' && m_amount.Find('.')==-1 )
		m_amount.Delete( 0, 1 );
	m_amount += '6';
	if( m_curr_or_num==IDC_CURRENCY )
	{
		m_amount += ' ';
		m_amount += Currency::get_c_letter( COUNTRIES[m_cur_sel] );
	}
	CWnd::SetDlgItemText( IDC_RESULT, m_amount );
}

void CCurrencyCalculatorDlg::OnNum7() 
{
	if( m_amount.Find( ' ' )!=-1 )
		m_amount = remove_c_letter();
	if( new_num_flag )
	{
		m_amount = '7';