dcsimg

A class for the IE3 DateTime Picker

WEBINAR:
On-Demand

Desktop-as-a-Service Designed for Any Cloud ? Nutanix Frame


DateTimeCtrl image

Environment:Win95/NT 4.0, UNICODE, VC++ 5.0, IE3.0, IE4.0, WinCE 2.0 and Windows CE Toolkit

The DateTimeCtrl is implemented in the IE3 common controls (v 4.70). Those with MS Visual C++ 5.0 will have this installed and hence will have access to the control, but unfortunately not to a simple MFC wrapper for the control.

This article and the date picker class has been updated to include CE support with the help of Gerrit Hoekstra. Those using VC6 and IE4 have access to this control built into VC IDE, and hence will not need the information in this article.

The CDateTimeCtrl presented here is a simple class that provides an MFC wrapper, as well as a few overridables in order to deal with some of the window messages sent by the control. More info on the DateTime control can be found at Microsoft.

To use the control in a dialog, create a custom control with classname "SysDateTimePick32", and then subclass the control with a member variable of type CDateTimeCtrl. Alternatively, the control can be created at run-time using CDateTimeCtrl::Create. If you create the control using a custom control on dialog template then you can set the value of the controls style using the "Style" edit box in controls Properties edit box.

DateTimeCtrl styles available:
 

Style Description
DTS_UPDOWN Use UPDOWN instead of MONTHCAL 
DTS_SHOWNONE Allow a NONE selection 
DTS_SHORTDATEFORMAT Use the short date format (app must forward WM_WININICHANGE messages) 
DTS_LONGDATEFORMAT Use the long date format (app must forward WM_WININICHANGE messages)
DTS_TIMEFORMAT Use the time format (app must forward WM_WININICHANGE messages) 
DTS_APPCANPARSE Allow user entered strings (app MUST respond to DTN_USERSTRING) 
DTS_RIGHTALIGN Right-align popup instead of left-align it

  Operations:
    CTime    GetDateTime();
	BOOL     SetDateTime(const CTime& time);    
	COleDateTime GetOleDateTime();                       // Not in CE
	BOOL     SetDateTime(const COleDateTime& time);  // Not in CE
	COLORREF SetMonthCalColour(int nColIndex, COLORREF colour);
	COLORREF GetMonthCalColour(int nColIndex);
	BOOL     SetFormat(LPCTSTR szFmt);
	void     SetMonthCalFont(CFont& font, BOOL bRedraw = TRUE);
	CFont*   GetMonthCalFont();
	BOOL     SetRange(CTime* pMinTime, CTime* pMaxTime);
	DWORD    GetRange(CTime* pMinTime, CTime* pMaxTime);
	BOOL     SetRange(COleDateTime* pMinTime, COleDateTime* pMaxTime);  // Not in CE
	DWORD    GetRange(COleDateTime* pMinTime, COleDateTime* pMaxTime);  // Not in CE

Set and GetDateTime set and retrieve the date and time for the control, SetRange/GetRange set the valid date ranges, and SetFormat sets the date display format (see GetDateFormat and GetTimeFormat for the format of szFmt).

SetMonthCalColour/GetMonthCalColour get and set the colour of the monthcal dropdown. The following values of nColIndex are used to set the different colours:
 

Value of nColIndex Meaning
MCSC_BACKGROUND The background color (between months)
MCSC_TEXT The dates
MCSC_TITLEBK Background of the title
MCSC_TITLETEXT  Title text
MCSC_MONTHBK Background within the month cal
MCSC_TRAILINGTEXT The text color of header & trailing days

The following notification messages are used with the DateTimeCtrl.

        Notification        Description
        DTN_DATETIMECHANGE  Signals a change within the DTP control. Must return 0.
        DTN_DROPDOWN        Indicates that the drop-down month calendar is about to be 
                            displayed.
        DTN_CLOSEUP         Indicates that the drop-down month calendar is about to be 
                            removed. 
        DTN_USERSTRING      Signals the end of a user's edit operation within the control.
                            This notification is sent only by DTP controls that use the 
                            DTS_APPCANPARSE style. Must return 0. 
        DTN_WMKEYDOWN       Signals that the user has pressed a key in a callback field of
                            the DTP control.  Must return 0. 
        DTN_FORMAT          Requests text to display in a portion of the format string 
                            described as a callback field.  Must return 0. 
        DTN_FORMATQUERY     Requests information about the maximum allowable size of the 
                            text to be displayed in a callback field.  Must return 0. 

  To handle illustrate how to handle these messages (and for convenience), a number of virtual functions are included:
	virtual BOOL OnDateTimeChangeNotify(LPNMDATETIMECHANGE dtmh, LRESULT* result);
	virtual BOOL OnDropDown(NMHDR * pNotifyStruct, LRESULT* result);
	virtual BOOL OnCloseUp(NMHDR * pNotifyStruct, LRESULT* result);
	virtual BOOL OnUserString(NMDATETIMESTRING* lpDTstring, LRESULT* pResult);
	virtual BOOL OnKeyDown(NMDATETIMEWMKEYDOWN* lpDTKeystroke, LRESULT* pResult);
	virtual BOOL OnFormat(NMDATETIMEFORMAT* lpNMFormat, LRESULT* pResult);
	virtual BOOL OnFormatQuery(NMDATETIMEFORMATQUERY* lpNMFormat, LRESULT* pResult);

These functions return FALSE to allow the parent window to see the notification message, and TRUE to block it. A final function

	virtual void DoDateTimeChange();
has been provided to handle changes in the date or time of the control.

Download source files or sample project.

NEW: Download the CE demo project by Gerrit Hoekstra.

Last updated: 14 Feb 1999



Comments

  • There are no comments yet. Be the first to comment!

  • You must have javascript enabled in order to post comments.

Leave a Comment
  • Your email address will not be published. All fields are required.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date