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// ButtonDemoDlg.cpp : implementation file 
// 
 
#include "stdafx.h" 
#include "ButtonDemo.h" 
#include "ButtonDemoDlg.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CButtonDemoDlg dialog 
 
CButtonDemoDlg::CButtonDemoDlg(CWnd* pParent /*=NULL*/) 
	: CDialog(CButtonDemoDlg::IDD, pParent) 
{ 
	//{{AFX_DATA_INIT(CButtonDemoDlg) 
	m_nX = 0; 
	m_nY = 0; 
	m_nAnswer = 0; 
	//}}AFX_DATA_INIT 
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 
} 
 
void CButtonDemoDlg::DoDataExchange(CDataExchange* pDX) 
{ 
	CDialog::DoDataExchange(pDX); 
	//{{AFX_DATA_MAP(CButtonDemoDlg) 
	DDX_Text(pDX, IDC_EDIT_X, m_nX); 
	DDX_Text(pDX, IDC_EDIT_Y, m_nY); 
	DDX_Text(pDX, IDC_EDIT_ANSWER, m_nAnswer); 
	//}}AFX_DATA_MAP 
} 
 
BEGIN_MESSAGE_MAP(CButtonDemoDlg, CDialog) 
	//{{AFX_MSG_MAP(CButtonDemoDlg) 
	ON_WM_PAINT() 
	ON_WM_QUERYDRAGICON() 
	ON_BN_CLICKED(IDC_BUTTON_ADD, OnButtonAdd) 
	ON_BN_CLICKED(IDC_BUTTON_SUBTRACT, OnButtonSubtract) 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CButtonDemoDlg message handlers 
 
BOOL CButtonDemoDlg::OnInitDialog() 
{ 
	CDialog::OnInitDialog(); 
 
	// 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 
	 
	return TRUE;  // return TRUE  unless you set the focus to a control 
} 
 
// 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 CButtonDemoDlg::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 CButtonDemoDlg::OnQueryDragIcon() 
{ 
	return (HCURSOR) m_hIcon; 
} 
 
 
 
// ============================================================================= 
// ============================================================================= 
/*	This is it!  The entire code needed to get this program working. 
	The commands OnButtonAdd () and OnButtonSubtract () are called whenever the 
	user clicks on either button.  The call to UpdateData (TRUE), sets the 
	member variables m_nX and m_nY to whatever value is currently in the CEdit 
	boxes on the dialog box.  Then, once we are done modifying the values, we 
	again call UpdateData (FALSE) to 'set' the CEdit boxes with the new values */ 
// ============================================================================= 
// ============================================================================= 
void CButtonDemoDlg::OnButtonAdd()  
{ 
	UpdateData (TRUE); 
	m_nAnswer = m_nX + m_nY; 
	UpdateData (FALSE); 
} 
 
void CButtonDemoDlg::OnButtonSubtract()  
{ 
	UpdateData (TRUE); 
	m_nAnswer = m_nX - m_nY; 
	UpdateData (FALSE); 
}