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calcdlg.cpp
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C/C++ Source or Header
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1998-03-26
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11KB
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508 lines
// calcdlg.cpp : implementation file
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
#include "stdafx.h"
#include "mfccalc.h"
#include "calcdlg.h"
#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE 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
// Implementation
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//{{AFX_MSG(CAboutDlg)
virtual BOOL OnInitDialog();
//}}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()
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg message handlers
BOOL CAboutDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// TODO: Add extra initialization here
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////
// CCalcDlg dialog
IMPLEMENT_DYNCREATE(CCalcDlg, CDialog)
BEGIN_DISPATCH_MAP(CCalcDlg, CDialog)
//{{AFX_DISPATCH_MAP(CCalcDlg)
DISP_PROPERTY_EX(CCalcDlg, "Accum", GetAccum, SetAccum, VT_I4)
DISP_PROPERTY_EX(CCalcDlg, "Operand", GetOperand, SetOperand, VT_I4)
DISP_PROPERTY_EX(CCalcDlg, "Operation", GetOperation, SetOperation, VT_I2)
DISP_PROPERTY_EX(CCalcDlg, "Visible", GetVisible, SetVisible, VT_BOOL)
DISP_FUNCTION(CCalcDlg, "Evaluate", Evaluate, VT_BOOL, VTS_NONE)
DISP_FUNCTION(CCalcDlg, "Clear", Clear, VT_EMPTY, VTS_NONE)
DISP_FUNCTION(CCalcDlg, "Display", Display, VT_EMPTY, VTS_NONE)
DISP_FUNCTION(CCalcDlg, "Close", Close, VT_EMPTY, VTS_NONE)
DISP_FUNCTION(CCalcDlg, "Button", Button, VT_BOOL, VTS_BSTR)
//}}AFX_DISPATCH_MAP
END_DISPATCH_MAP()
#ifndef IMPLEMENT_OLECREATE_SINGLE
// MFC will provide this macro in the future. For now, we define it.
#define IMPLEMENT_OLECREATE_SINGLE(class_name, external_name, \
l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
AFX_DATADEF COleObjectFactory class_name::factory(class_name::guid, \
RUNTIME_CLASS(class_name), TRUE, _T(external_name)); \
const AFX_DATADEF GUID class_name::guid = \
{ l, w1, w2, { b1, b2, b3, b4, b5, b6, b7, b8 } };
#endif
// {62C4DD10-F45E-11cd-8C3D-00AA004BB3B7}
IMPLEMENT_OLECREATE_SINGLE(CCalcDlg, "mfccalc.calculator",
0x62c4dd10, 0xf45e, 0x11cd, 0x8c, 0x3d, 0x0, 0xaa, 0x0, 0x4b, 0xb3, 0xb7);
CCalcDlg::CCalcDlg(CWnd* pParent /*=NULL*/)
: CDialog(CCalcDlg::IDD, pParent)
{
m_bAutoDelete = TRUE; // default to auto-delete
m_dwRegister = 0; // not registered as active by default
//{{AFX_DATA_INIT(CCalcDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
// Note that LoadAccelerator does not require DestroyAcceleratorTable
m_hAccel = LoadAccelerators(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDD));
// clear the contents of the calculator and reset state
OnClickedClear();
// enable this object for OLE automation
EnableAutomation();
}
CCalcDlg::~CCalcDlg()
{
if (m_dwRegister != 0)
RevokeActiveObject(m_dwRegister, NULL);
}
void CCalcDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CCalcDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}
/////////////////////////////////////////////////////////////////////////////
// CCalcDlg implementation
void CCalcDlg::PerformOperation()
{
if (m_errorState != ErrNone)
return;
if (m_bOperandAvail)
{
if (m_operator == OpNone)
m_accum = m_operand;
else if (m_operator == OpMultiply)
m_accum *= m_operand;
else if (m_operator == OpDivide)
{
if (m_operand == 0)
m_errorState = ErrDivideByZero;
else
m_accum /= m_operand;
}
else if (m_operator == OpAdd)
m_accum += m_operand;
else if (m_operator == OpSubtract)
m_accum -= m_operand;
}
m_bOperandAvail = FALSE;
UpdateDisplay();
}
void CCalcDlg::ClickedNumber(long l)
{
if (m_errorState != ErrNone)
return;
if (!m_bOperandAvail)
m_operand = 0L;
SetOperand(m_operand*10+l);
UpdateDisplay();
}
void CCalcDlg::UpdateDisplay()
{
if (GetSafeHwnd() == NULL)
return;
CString str;
if (m_errorState != ErrNone)
str.LoadString(IDS_ERROR);
else
{
long lVal = (m_bOperandAvail) ? m_operand : m_accum;
str.Format(_T("%ld"), lVal);
}
GetDlgItem(IDE_ACCUM)->SetWindowText(str);
GetDlgItem(IDC_INVISIBLE_FOCUS)->SetFocus();
}
BEGIN_MESSAGE_MAP(CCalcDlg, CDialog)
//{{AFX_MSG_MAP(CCalcDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_COMMAND_RANGE(IDB_0, IDB_9, OnClickedNumber)
ON_BN_CLICKED(IDB_CLEAR, OnClickedClear)
ON_BN_CLICKED(IDB_DIVIDE, OnClickedDivide)
ON_BN_CLICKED(IDB_EQUAL, OnClickedEqual)
ON_BN_CLICKED(IDB_MINUS, OnClickedMinus)
ON_BN_CLICKED(IDB_PLUS, OnClickedPlus)
ON_BN_CLICKED(IDB_TIMES, OnClickedTimes)
ON_EN_SETFOCUS(IDE_ACCUM, OnSetFocusAccum)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CCalcDlg message handlers
BOOL CCalcDlg::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);
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
pSysMenu->RemoveMenu(SC_MAXIMIZE, MF_BYCOMMAND);
pSysMenu->RemoveMenu(SC_SIZE, MF_BYCOMMAND);
// want focus to stay on the dialog itself (until a button is clicked)
SetFocus();
return FALSE;
}
void CCalcDlg::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 CCalcDlg::OnPaint()
{
if (!IsIconic())
{
CDialog::OnPaint();
return;
}
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);
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CCalcDlg::OnQueryDragIcon()
{
return (HCURSOR)m_hIcon;
}
void CCalcDlg::OnClickedNumber(UINT nID)
{
ASSERT(nID >= IDB_0 && nID <= IDB_9);
ClickedNumber(nID - IDB_0);
}
void CCalcDlg::OnClickedClear()
{
m_operator = OpNone;
m_operand = 0L;
m_accum = 0L;
m_bOperandAvail = FALSE;
m_errorState = ErrNone;
UpdateDisplay();
}
void CCalcDlg::OnClickedDivide()
{
PerformOperation();
m_operator = OpDivide;
}
void CCalcDlg::OnClickedEqual()
{
PerformOperation();
m_operator = OpNone;
}
void CCalcDlg::OnClickedMinus()
{
PerformOperation();
m_operator = OpSubtract;
}
void CCalcDlg::OnClickedPlus()
{
PerformOperation();
m_operator = OpAdd;
}
void CCalcDlg::OnClickedTimes()
{
PerformOperation();
m_operator = OpMultiply;
}
BOOL CCalcDlg::PreTranslateMessage(MSG* pMsg)
{
if (m_hAccel != NULL && TranslateAccelerator(m_hWnd, m_hAccel, pMsg))
return TRUE;
return CDialog::PreTranslateMessage(pMsg);
}
void CCalcDlg::PostNcDestroy()
{
if (m_bAutoDelete)
delete this;
}
void CCalcDlg::OnCancel()
{
DestroyWindow();
}
void CCalcDlg::OnOK()
{
}
void CCalcDlg::OnSetFocusAccum()
{
GetDlgItem(IDC_INVISIBLE_FOCUS)->SetFocus();
}
/////////////////////////////////////////////////////////////////////////////
// CCalcDlg automation
BOOL CCalcDlg::RegisterActive()
{
// attempt to register as the active object for the CCalcDlg CLSID
return RegisterActiveObject(GetInterface(&IID_IUnknown),
CCalcDlg::guid, NULL, &m_dwRegister) == NOERROR;
}
long CCalcDlg::GetAccum()
{
return m_accum;
}
void CCalcDlg::SetAccum(long nNewValue)
{
m_accum = nNewValue;
}
long CCalcDlg::GetOperand()
{
return m_operand;
}
void CCalcDlg::SetOperand(long nNewValue)
{
m_operand = nNewValue;
m_bOperandAvail = TRUE;
}
short CCalcDlg::GetOperation()
{
return m_operator;
}
void CCalcDlg::SetOperation(short nNewValue)
{
m_operator = (Operator)nNewValue;
}
BOOL CCalcDlg::GetVisible()
{
return m_hWnd != NULL && (GetStyle() & WS_VISIBLE) != 0;
}
void CCalcDlg::SetVisible(BOOL bNewValue)
{
if (bNewValue == GetVisible())
return;
if (bNewValue)
{
// create it if necessary
if (m_hWnd == NULL && !Create(CCalcDlg::IDD))
return;
// set up as the active window for the application
if (AfxGetThread()->m_pMainWnd == NULL)
AfxGetThread()->m_pMainWnd = this;
// show it
ShowWindow(SW_SHOWNORMAL);
}
else
{
if (m_hWnd != NULL)
ShowWindow(SW_HIDE);
}
}
BOOL CCalcDlg::Evaluate()
{
OnClickedEqual();
return m_errorState == ErrNone;
}
void CCalcDlg::Clear()
{
OnClickedClear();
}
void CCalcDlg::Display()
{
UpdateDisplay();
}
void CCalcDlg::Close()
{
if (m_hWnd == NULL)
{
AfxPostQuitMessage(0);
return;
}
BOOL bAutoDelete = m_bAutoDelete;
m_bAutoDelete = FALSE;
DestroyWindow();
m_bAutoDelete = bAutoDelete;
}
BOOL CCalcDlg::Button(LPCTSTR szButton)
{
switch (szButton[0])
{
case 'c':
case 'C':
OnClickedClear();
break;
case '/':
OnClickedDivide();
break;
case '+':
OnClickedPlus();
break;
case '-':
OnClickedMinus();
break;
case '*':
OnClickedTimes();
break;
case '=':
OnClickedEqual();
break;
default:
if (szButton[0] >= '0' && szButton[0] <= '9')
ClickedNumber(szButton[0] - '0');
else
return FALSE;
break;
}
return TRUE;
}