Introduction

Many articles about the masked edit control could be discovered from MFC sites. Their Date Time Edit controls show some faults such as out-of-range values are not verified, slow processing, etc. Why? Maybe because they are too general and cover many things.

ThisVDateTimeEdit class based onMaskEdit's idea is very simple and understandable for any programmer. You can choose either numeric keys or up/down keys to change the date & time displayed. The Date-Time display is configurable bySetMask().

Mask convention:

Enjoy yourself and please report me the bugs you have found.

Source Code

/////////////////////////////////////////////////////////////////////////////// VDateTimeEdit windowconst UINT WM_DATETIME_EDIT = ::RegisterWindowMessage("WM_DATETIME_EDIT");#define DTE_DATETIMECHANGED 0x0001class VDateTimeEdit :public CEdit{// Constructionpublic:    VDateTimeEdit();// Attributespublic:// Operationspublic:// Overrides// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(VDateTimeEdit)protected:virtualvoid PreSubclassWindow();//}}AFX_VIRTUAL// Implementationpublic:    CString GetMask()const {return m_strMask;}void SetMask(CString mask);    COleDateTime GetDateTime();    COleDateTime GetDateTime(CString str);void SetDateTime(COleDateTime dt);virtual ~VDateTimeEdit();// Generated message map functionsprotected:    afx_msgvoid OnContextMenu(CWnd*, CPoint point);    CString m_strMask;//{{AFX_MSG(VDateTimeEdit)    afx_msgvoid OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);    afx_msgvoid OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags);    afx_msgvoid OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);    afx_msgvoid OnMouseMove(UINT nFlags, CPoint point);//}}AFX_MSG    DECLARE_MESSAGE_MAP()};bool VAtoi(CString str,int &res){    str.Remove(char(32));if (str.IsEmpty())returnfalse;bool error =false;for (int i =0; i< str.GetLength() && !error; i++) {int c = ::tolower(str[i]);        error = !(            (c>='0' && c<='9')            || ((c =='-' || c =='+') && i ==0)            );    }if (!error) res = atoi(LPCTSTR(str));return !error;}template<class TYPE>void VSetInRange(TYPE &x, TYPE min, TYPE max) {    ASSERT(min<=max);if (x< min) x = min;elseif (x> max) x = max;}/************************** VDateTimeEdit **************************/VDateTimeEdit::VDateTimeEdit(){    m_strMask = _T("DD/MM/YYYY hh:mm:ss");}VDateTimeEdit::~VDateTimeEdit(){}BEGIN_MESSAGE_MAP(VDateTimeEdit, CEdit)    ON_WM_CONTEXTMENU()//{{AFX_MSG_MAP(VDateTimeEdit)    ON_WM_CHAR()    ON_WM_KEYUP()    ON_WM_KEYDOWN()    ON_WM_MOUSEMOVE()//}}AFX_MSG_MAPEND_MESSAGE_MAP()///////////////////////////////////////////////////////////////////////////// VDateTimeEdit message handlersvoid VDateTimeEdit::OnChar(UINT nChar, UINT/*nRepCnt*/, UINT/*nFlags*/) {    CString old;    GetWindowText(old);int pos;    TCHAR c;    GetSel(pos, pos);switch (nChar) {case VK_BACK: pos--;break;case VK_UP: pos--;break;case'0':case'1':case'2':case'3':case'4':case'5':case'6':case'7':case'8':case'9':if (pos< old.GetLength()                  && pos< m_strMask.GetLength()                  && (UINT)old[pos] != nChar                  && ((c = m_strMask[pos]) =='D' ||                   c =='M' || c =='Y' || c =='h'                   || c =='m' || c =='s')) {                CString str = old;                str.SetAt(pos, (TCHAR)nChar);                COleDateTime dt = GetDateTime(str);if (dt.GetStatus() == COleDateTime::valid) SetDateTime(dt);            }if (++pos< m_strMask.GetLength())for ( c = m_strMask[pos]; pos< m_strMask.GetLength()                     && c !='D' &&                     c !='M' && c !='Y' &&                     c !='h' && c !='m' && c !='s';                  c = m_strMask[pos]) pos++;break;default:if (++pos< m_strMask.GetLength())for ( c = m_strMask[pos]; pos< m_strMask.GetLength()                       && c !='D' && c !='M'                       && c !='Y' && c !='h'                       && c !='m' && c !='s';                    c = m_strMask[pos]) pos++;break;    }    SetSel(pos, pos);}void VDateTimeEdit::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) {    CEdit::OnKeyUp(nChar, nRepCnt, nFlags);}void VDateTimeEdit::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) {switch (nChar) {case VK_DELETE:case VK_INSERT:break;case VK_UP:case VK_DOWN:            {                CString old;                GetWindowText(old);int pos;                GetSel(pos, pos);if (pos< m_strMask.GetLength()) {                    TCHAR c = m_strMask[pos];if (c !='D' && c !='M' &&                       c !='Y' && c !='h' &&                       c !='m' && c !='s')if (--pos>=0) c = m_strMask[pos];                    tm t;                    COleDateTime dt = GetDateTime();                    t.tm_mday = dt.GetDay();                    t.tm_mon = dt.GetMonth();                    t.tm_year = dt.GetYear();                    t.tm_hour = dt.GetHour();                    t.tm_min = dt.GetMinute();                    t.tm_sec = dt.GetSecond();switch (c) {case'D':                            t.tm_mday += (nChar!=VK_UP) ? -1 :1;break;case'M':                            t.tm_mon += (nChar!=VK_UP) ? -1 :1;break;case'Y':                            t.tm_year += (nChar!=VK_UP) ? -1 :1;break;case'h':                            t.tm_hour += (nChar!=VK_UP) ? -1 :1;break;case'm':                            t.tm_min += (nChar!=VK_UP) ? -1 :1;break;case's':                            t.tm_sec += (nChar!=VK_UP) ? -1 :1;break;default    :                             CEdit::OnKeyDown(nChar, nRepCnt, nFlags);break;                    }                    dt.SetDateTime(t.tm_year, t.tm_mon, t.tm_mday,                                       t.tm_hour, t.tm_min, t.tm_sec);if (dt.GetStatus() == COleDateTime::valid)                         SetDateTime(dt);                }else CEdit::OnKeyDown(nChar, nRepCnt, nFlags);            }break;default:            CEdit::OnKeyDown(nChar, nRepCnt, nFlags);break;    }}void VDateTimeEdit::OnMouseMove(UINT nFlags, CPoint point) {// TODO: Add your message handler code here and/or call default        CEdit::OnMouseMove(nFlags, point);}void VDateTimeEdit::PreSubclassWindow() {    SetDateTime(COleDateTime::GetCurrentTime());    CEdit::PreSubclassWindow();}void VDateTimeEdit::SetDateTime(COleDateTime dt){    CString str;int i, n = m_strMask.GetLength();for (i =0; i< n; i++) {        CString s;int val;        TCHAR c = m_strMask[i];switch (c) {case'D':case'M':case'Y':case'h':case'm':case's':for (; i< n; i++) {if (m_strMask[i] == c) s += c;else {i--;break;}                }break;default :break;        }        CString format;        format.Format("%%0%dd", s.GetLength());switch (c) {case'D':                val = dt.GetDay();                ::VSetInRange(val,0,31);                s.Format(format, val);break;case'M':                val = dt.GetMonth();                ::VSetInRange(val,1,12);                s.Format(format, val);break;case'Y':                val = dt.GetYear();                ::VSetInRange(val,1900,9990);                s.Format(format, val);break;case'h':                val = dt.GetHour();                ::VSetInRange(val,0,23);                s.Format(format, val);break;case'm':                val = dt.GetMinute();                ::VSetInRange(val,0,59);                s.Format(format, val);break;case's':                val = dt.GetSecond();                ::VSetInRange(val,0,59);                s.Format(format, val);break;default :                s = c;break;        }        str += s;    }int pos;    GetSel(pos, pos);    SetWindowText(str);    SetSel(pos, pos);    CWnd *pOwner = GetParent();if (pOwner != NULL)       pOwner->PostMessage(WM_DATETIME_EDIT,                   (WPARAM)DTE_DATETIMECHANGED, (LPARAM)0);}COleDateTime VDateTimeEdit::GetDateTime(){    CString str;    GetWindowText(str);return GetDateTime(str);}COleDateTime VDateTimeEdit::GetDateTime(CString str){    tm t;    COleDateTime dt;    dt.SetStatus(COleDateTime::invalid);    CTime::GetCurrentTime().GetLocalTm(&t);    t.tm_mon +=1;    t.tm_year +=1900;int i, n = m_strMask.GetLength();for (i =0; i< n; i++) {        CString s;        TCHAR c = m_strMask[i];switch (c) {case'D':case'M':case'Y':case'h':case'm':case's':for ( ; i< n; i++) {if (str.GetLength()<= s.GetLength())break;if (m_strMask[i] == c) s += str[s.GetLength()];else {i--;break;}                }break;default :if (str.GetLength()<0 || str[0] != (s = c))return dt;break;        }        str = str.Right(str.GetLength() - s.GetLength());int val;switch (c) {case'D':if (!::VAtoi(s, val))return dt;                ::VSetInRange(val,1,31);                t.tm_mday = val;break;case'M':if (!::VAtoi(s, val))return dt;                ::VSetInRange(val,1,12);                t.tm_mon = val;break;case'Y':if (!::VAtoi(s, val))return dt;                ::VSetInRange(val,1900,9990);                t.tm_year = val;break;case'h':if (!::VAtoi(s, val))return dt;                ::VSetInRange(val,0,23);                t.tm_hour = val;break;case'm':if (!::VAtoi(s, val))return dt;                ::VSetInRange(val,0,59);                t.tm_min = val;break;case's':if (!::VAtoi(s, val))return dt;                ::VSetInRange(val,0,59);                t.tm_sec = val;break;default :break;        }    }    dt.SetStatus(COleDateTime::valid);    dt.SetDateTime(t.tm_year, t.tm_mon,             t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec);return dt;}void VDateTimeEdit::OnContextMenu(CWnd*, CPoint){}void VDateTimeEdit::SetMask(CString mask) {    COleDateTime time = GetDateTime();    m_strMask = mask;    SetDateTime(time);}

That's it!

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