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Nullable CDateTimeCtrl?
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rockdale
Mar 24, 2008, 10:58:55 AM3/24/08
to
Hi, all:
I have a datetime fiels visit_date on my dialog which currently using
CDateTimeCtrl for use to pick the date that they visit, but the visit
date should allow null which the CdateTimeCtrl does not support, what
is the best way to implement this?
I am thinking using a masked CEdit ctrl for user to enter date /delete
date, then put a button besidethe textbox so user can click this
button to shoiw the calendar if they want choose date from the
CDateTimeCtrl?
Or are any better implementations out there already, please point me
to the hyperlinks.
thanks
-rockdale
![Doug Harrison [MVP]'s profile photo](http://lh3.googleusercontent.com/a-/ALV-UjVvzhOQGbT9K0Re6Qg-OU4VGuHq0tAdTu01YlmIjUGm6t_o8g=s40-c)
Doug Harrison [MVP]
Mar 24, 2008, 11:50:05 AM3/24/08
to
You can hide the current value with SetFormat(" "). To restore the default
format, SetFormat(0). This works great for showing a blank control, when
the control is disabled, but if you want to show a blank, enabled control,
you'll have to figure out which messages to handle in order to restore the
date/time display at the right moment.
--
Doug Harrison
Visual C++ MVP
![Sheng Jiang[MVP]'s profile photo](https://lh3.googleusercontent.com/a/default-user=s40-c)
Sheng Jiang[MVP]
Mar 24, 2008, 1:16:23 PM3/24/08
to
use DTS_SHOWNONE
--
Sheng Jiang
Microsoft MVP in VC++
"rockdale" <rockdal...@gmail.com> wrote in message
news:47df4c4f-dd81-40f8...@s50g2000hsb.googlegroups.com...
rockdale
Mar 24, 2008, 12:40:30 PM3/24/08
to
The first time I can use SetFormat("") to hide Today's date when I
initDialog, Then the user can
pick a date from the CDateTimeCtrl, but what if they try to delete/
empty the date they picked before? This part I do not know how. add a
button say "clear"
also, How could I know the DateTime is picked by the user or is the
underline datetime for SetFormat(""), or should I set a special date
so that I know the user did not pick a date?
initDialog, Then the user can
pick a date from the CDateTimeCtrl, but what if they try to delete/
empty the date they picked before? This part I do not know how. add a
button say "clear"
also, How could I know the DateTime is picked by the user or is the
underline datetime for SetFormat(""), or should I set a special date
so that I know the user did not pick a date?
thanks again
On Mar 24, 1:16 pm, "Sheng Jiang[MVP]"
<sheng_ji...@hotmail.com.discuss> wrote:
> use DTS_SHOWNONE
>
> --
> Sheng Jiang
> Microsoft MVP in VC++"rockdale" <rockdale.gr...@gmail.com> wrote in message
> > -rockdale- Hide quoted text -
>
> - Show quoted text -
Sheng Jiang[MVP]
Mar 26, 2008, 11:47:38 AM3/26/08
to
I am not suggesting changing the formating. I am suggesting the DTS_SHOWNONE
style.
Use SetTime/GetTime to get/set the time.A null time has a COleDateTime::null
status.
style.
Use SetTime/GetTime to get/set the time.A null time has a COleDateTime::null
status.
--
Sheng Jiang
Microsoft MVP in VC++
"rockdale" <rockdal...@gmail.com> wrote in message
news:f187b421-065f-4332...@m3g2000hsc.googlegroups.com...
Doug Harrison [MVP]
Mar 26, 2008, 12:51:53 PM3/26/08
to
On Wed, 26 Mar 2008 09:47:38 -0600, "Sheng Jiang[MVP]"
<sheng...@hotmail.com.discuss> wrote:
<sheng...@hotmail.com.discuss> wrote:
>I am not suggesting changing the formating. I am suggesting the DTS_SHOWNONE
>style.
>
>Use SetTime/GetTime to get/set the time.A null time has a COleDateTime::null
>status.
Last time I looked, DTS_SHOWNONE added a checkbox inside the control, and
when unchecked, simply grayed the text of the control. I never could get
the control to display nothing at all using DTS_SHOWNONE. The only way I
found was the SetFormat method I posted earlier.
Sheng Jiang[MVP]
Mar 26, 2008, 2:07:04 PM3/26/08
to
The op wants to
1 pick the date that they visit,
2 allow null which he thinks the CDateTimeCtrl does not support
I just point out CDateTimeCtrl does support null values.
1 pick the date that they visit,
2 allow null which he thinks the CDateTimeCtrl does not support
I just point out CDateTimeCtrl does support null values.
I agree changing the formating will look nicer, but the feedback from data
entry people is that masked editbox makes input faster.
--
Sheng Jiang
Microsoft MVP in VC++
"Doug Harrison [MVP]" <d...@mvps.org> wrote in message
news:20vku39l4nu2vd42u...@4ax.com...
Alfred Furer
Dec 7, 2011, 11:43:06 AM12/7/11
to
Make a new class as below
Hope it helps you
.h
#pragma once
void AFXAPI DDX_DateTimeCtrl(CDataExchange* pDX, int nIDC, COleDateTime& value);
// CDateTimeEx
class CDateTimeEx : public CDateTimeCtrl
{
DECLARE_DYNAMIC(CDateTimeEx)
public:
CDateTimeEx();
virtual ~CDateTimeEx();
protected:
virtual BOOL PreTranslateMessage(MSG* pMsg);
afx_msg void OnPopupDelete();
afx_msg void OnDtnDatetimechange(NMHDR *pNMHDR, LRESULT *pResult);
DECLARE_MESSAGE_MAP()
private:
void ShowMenu(void);
public:
unsigned int m_nIdCtrl;
CWnd* m_pWnd;
};
.cpp
// DateTimeEx.cpp : implementation file
//
#include "stdafx.h"
#include "DateTimeEx.h"
void AFXAPI DDX_DateTimeCtrl(CDataExchange* pDX, int nIDC, COleDateTime& value)
{
CDateTimeEx dt;
CString strTemp;
HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
CDateTimeCtrl* pWnd = (CDateTimeCtrl*) CWnd::FromHandle(hWndCtrl);
ENSURE(pWnd);
if (pDX->m_bSaveAndValidate)
{
int nLen = ::GetWindowTextLength(hWndCtrl);
::GetWindowText(hWndCtrl, strTemp.GetBufferSetLength(nLen), nLen+1);
strTemp.ReleaseBuffer();
if (strTemp.IsEmpty() || strTemp == _T(" "))
{
value.SetStatus(COleDateTime::null);
}
else
{
if (!value.ParseDateTime(strTemp)) // throws exception
{
value.SetStatus(COleDateTime::null);
// Can't convert string to datetime
AfxMessageBox(AFX_IDP_PARSE_DATETIME);
pDX->Fail(); // throws exception
}
}
}
else
{
if (value.GetStatus() == COleDateTime::valid)
{
pWnd->SetFormat(NULL);
pWnd->SetTime(value);
strTemp = value.Format();
}
else
{
// Sets the time to the calendar
pWnd->SetTime(COleDateTime::GetCurrentTime());
// Clears the DateTime control
pWnd->SetFormat(" ");
strTemp = _T("");
AfxSetWindowText(hWndCtrl, strTemp);
}
}
}
// CDateTimeEx
IMPLEMENT_DYNAMIC(CDateTimeEx, CDateTimeCtrl)
CDateTimeEx::CDateTimeEx()
: m_nIdCtrl(0)
, m_pWnd(NULL)
{
}
CDateTimeEx::~CDateTimeEx()
{
}
BEGIN_MESSAGE_MAP(CDateTimeEx, CDateTimeCtrl)
ON_COMMAND(IDM_POPUP_DELETE, &CDateTimeEx::OnPopupDelete)
ON_NOTIFY_REFLECT(DTN_DATETIMECHANGE, &CDateTimeEx::OnDtnDatetimechange)
END_MESSAGE_MAP()
// CDateTimeEx message handlers
BOOL CDateTimeEx::PreTranslateMessage(MSG* pMsg)
{
BOOL bCtrlFound = FALSE;
// Retreiving Control ID
m_pWnd = FromHandle(pMsg->hwnd);
if (m_pWnd != NULL)
{
m_nIdCtrl = m_pWnd->GetDlgCtrlID();
bCtrlFound = TRUE;
}
switch (pMsg->message)
{
case WM_MOUSEMOVE:
break;
case WM_CHAR:
break;
case WM_LBUTTONDBLCLK:
break;
case WM_RBUTTONUP:
break;
case WM_RBUTTONDOWN:
ShowMenu();
break;
case WM_LBUTTONDOWN:
break;
case WM_KEYDOWN:
// No ESCAPE or RETURN Key
if( pMsg->wParam == VK_RETURN || pMsg->wParam == VK_ESCAPE )
{
::TranslateMessage(pMsg);
::DispatchMessage(pMsg);
return FALSE; // DO NOT process further
}
break;
// NO ALT+ key
case WM_SYSCOMMAND:
return TRUE;
break;
}
return CDateTimeCtrl::PreTranslateMessage(pMsg);
}
// Shows the delete popup menu item
void CDateTimeEx::ShowMenu(void)
{
int n = 0;
// Popup menu
CMenu popUpMenu;
popUpMenu.CreatePopupMenu();
popUpMenu.InsertMenu(n, MF_BYPOSITION, IDM_POPUP_DELETE, _T("Supprimer")); n++;
CPoint p;
GetCursorPos(&p);
popUpMenu.TrackPopupMenu(TPM_CENTERALIGN | TPM_LEFTBUTTON,
p.x, p.y, (CWnd *) this, NULL);
}
// Clears window content
void CDateTimeEx::OnPopupDelete()
{
SetFormat(" ");
m_pWnd->SetWindowTextA(_T(""));
}
void CDateTimeEx::OnDtnDatetimechange(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMDATETIMECHANGE pDTChange = reinterpret_cast<LPNMDATETIMECHANGE>(pNMHDR);
// Sets format to default sytem date format
SetFormat(NULL);
*pResult = 0;
>> On Monday, March 24, 2008 1:16 PM Sheng Jiang[MVP] wrote:
>> use DTS_SHOWNONE
>>> -rockdale
>>>> On Tuesday, March 25, 2008 7:44 AM rockdale wrote:
>>>> The first time I can use SetFormat("") to hide Today's date when I
>>>> initDialog, Then the user can
>>>> pick a date from the CDateTimeCtrl, but what if they try to delete/
>>>> empty the date they picked before? This part I do not know how. add a
>>>> button say "clear"
>>>> also, How could I know the DateTime is picked by the user or is the
>>>> underline datetime for SetFormat(""), or should I set a special date
>>>> so that I know the user did not pick a date?
>>>>
>>>> thanks again
>>>>
>>>> On Mar 24, 1:16=A0pm, "Sheng Jiang[MVP]"
>>>> <sheng_ji...@hotmail.com.discuss> wrote:
>>>> e
>>>>> On Wednesday, March 26, 2008 11:47 AM Sheng Jiang[MVP] wrote:
>>>>> I am not suggesting changing the formating. I am suggesting the DTS_SHOWNONE
>>>>> style.
>>>>> Use SetTime/GetTime to get/set the time.A null time has a COleDateTime::null
>>>>> status.
>>>>>
>>>>>> On Wednesday, March 26, 2008 12:51 PM Doug Harrison [MVP] wrote:
>>>>>> On Wed, 26 Mar 2008 09:47:38 -0600, "Sheng Jiang[MVP]"
>>>>>> <sheng...@hotmail.com.discuss> wrote:
>>>>>>
>>>>>>
>>>>>> Last time I looked, DTS_SHOWNONE added a checkbox inside the control, and
>>>>>> when unchecked, simply grayed the text of the control. I never could get
>>>>>> the control to display nothing at all using DTS_SHOWNONE. The only way I
>>>>>> found was the SetFormat method I posted earlier.
>>>>>>
>>>>>>> COleDateTime::null
Hope it helps you
.h
#pragma once
void AFXAPI DDX_DateTimeCtrl(CDataExchange* pDX, int nIDC, COleDateTime& value);
// CDateTimeEx
class CDateTimeEx : public CDateTimeCtrl
{
DECLARE_DYNAMIC(CDateTimeEx)
public:
CDateTimeEx();
virtual ~CDateTimeEx();
protected:
virtual BOOL PreTranslateMessage(MSG* pMsg);
afx_msg void OnPopupDelete();
afx_msg void OnDtnDatetimechange(NMHDR *pNMHDR, LRESULT *pResult);
DECLARE_MESSAGE_MAP()
private:
void ShowMenu(void);
public:
unsigned int m_nIdCtrl;
CWnd* m_pWnd;
};
.cpp
// DateTimeEx.cpp : implementation file
//
#include "stdafx.h"
#include "DateTimeEx.h"
void AFXAPI DDX_DateTimeCtrl(CDataExchange* pDX, int nIDC, COleDateTime& value)
{
CDateTimeEx dt;
CString strTemp;
HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
CDateTimeCtrl* pWnd = (CDateTimeCtrl*) CWnd::FromHandle(hWndCtrl);
ENSURE(pWnd);
if (pDX->m_bSaveAndValidate)
{
int nLen = ::GetWindowTextLength(hWndCtrl);
::GetWindowText(hWndCtrl, strTemp.GetBufferSetLength(nLen), nLen+1);
strTemp.ReleaseBuffer();
if (strTemp.IsEmpty() || strTemp == _T(" "))
{
value.SetStatus(COleDateTime::null);
}
else
{
if (!value.ParseDateTime(strTemp)) // throws exception
{
value.SetStatus(COleDateTime::null);
// Can't convert string to datetime
AfxMessageBox(AFX_IDP_PARSE_DATETIME);
pDX->Fail(); // throws exception
}
}
}
else
{
if (value.GetStatus() == COleDateTime::valid)
{
pWnd->SetFormat(NULL);
pWnd->SetTime(value);
strTemp = value.Format();
}
else
{
// Sets the time to the calendar
pWnd->SetTime(COleDateTime::GetCurrentTime());
// Clears the DateTime control
pWnd->SetFormat(" ");
strTemp = _T("");
AfxSetWindowText(hWndCtrl, strTemp);
}
}
}
// CDateTimeEx
IMPLEMENT_DYNAMIC(CDateTimeEx, CDateTimeCtrl)
CDateTimeEx::CDateTimeEx()
: m_nIdCtrl(0)
, m_pWnd(NULL)
{
}
CDateTimeEx::~CDateTimeEx()
{
}
BEGIN_MESSAGE_MAP(CDateTimeEx, CDateTimeCtrl)
ON_COMMAND(IDM_POPUP_DELETE, &CDateTimeEx::OnPopupDelete)
ON_NOTIFY_REFLECT(DTN_DATETIMECHANGE, &CDateTimeEx::OnDtnDatetimechange)
END_MESSAGE_MAP()
// CDateTimeEx message handlers
BOOL CDateTimeEx::PreTranslateMessage(MSG* pMsg)
{
BOOL bCtrlFound = FALSE;
// Retreiving Control ID
m_pWnd = FromHandle(pMsg->hwnd);
if (m_pWnd != NULL)
{
m_nIdCtrl = m_pWnd->GetDlgCtrlID();
bCtrlFound = TRUE;
}
switch (pMsg->message)
{
case WM_MOUSEMOVE:
break;
case WM_CHAR:
break;
case WM_LBUTTONDBLCLK:
break;
case WM_RBUTTONUP:
break;
case WM_RBUTTONDOWN:
ShowMenu();
break;
case WM_LBUTTONDOWN:
break;
case WM_KEYDOWN:
// No ESCAPE or RETURN Key
if( pMsg->wParam == VK_RETURN || pMsg->wParam == VK_ESCAPE )
{
::TranslateMessage(pMsg);
::DispatchMessage(pMsg);
return FALSE; // DO NOT process further
}
break;
// NO ALT+ key
case WM_SYSCOMMAND:
return TRUE;
break;
}
return CDateTimeCtrl::PreTranslateMessage(pMsg);
}
// Shows the delete popup menu item
void CDateTimeEx::ShowMenu(void)
{
int n = 0;
// Popup menu
CMenu popUpMenu;
popUpMenu.CreatePopupMenu();
popUpMenu.InsertMenu(n, MF_BYPOSITION, IDM_POPUP_DELETE, _T("Supprimer")); n++;
CPoint p;
GetCursorPos(&p);
popUpMenu.TrackPopupMenu(TPM_CENTERALIGN | TPM_LEFTBUTTON,
p.x, p.y, (CWnd *) this, NULL);
}
// Clears window content
void CDateTimeEx::OnPopupDelete()
{
SetFormat(" ");
m_pWnd->SetWindowTextA(_T(""));
}
void CDateTimeEx::OnDtnDatetimechange(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMDATETIMECHANGE pDTChange = reinterpret_cast<LPNMDATETIMECHANGE>(pNMHDR);
// Sets format to default sytem date format
SetFormat(NULL);
*pResult = 0;
>> use DTS_SHOWNONE
>>
>> --
>> Sheng Jiang
>> Microsoft MVP in VC++
>> --
>> Sheng Jiang
>> Microsoft MVP in VC++
>>> On Tuesday, March 25, 2008 7:44 AM rockdale wrote:
>>> Hi, all:
>>>
>>> I have a datetime fiels visit_date on my dialog which currently using
>>> CDateTimeCtrl for use to pick the date that they visit, but the visit
>>> date should allow null which the CdateTimeCtrl does not support, what
>>> is the best way to implement this?
>>>
>>> I am thinking using a masked CEdit ctrl for user to enter date /delete
>>> date, then put a button besidethe textbox so user can click this
>>> button to shoiw the calendar if they want choose date from the
>>> CDateTimeCtrl?
>>>
>>> Or are any better implementations out there already, please point me
>>> to the hyperlinks.
>>>
>>> thanks
>>> Hi, all:
>>>
>>> I have a datetime fiels visit_date on my dialog which currently using
>>> CDateTimeCtrl for use to pick the date that they visit, but the visit
>>> date should allow null which the CdateTimeCtrl does not support, what
>>> is the best way to implement this?
>>>
>>> I am thinking using a masked CEdit ctrl for user to enter date /delete
>>> date, then put a button besidethe textbox so user can click this
>>> button to shoiw the calendar if they want choose date from the
>>> CDateTimeCtrl?
>>>
>>> Or are any better implementations out there already, please point me
>>> to the hyperlinks.
>>>
>>> -rockdale
>>>> On Tuesday, March 25, 2008 7:44 AM rockdale wrote:
>>>> The first time I can use SetFormat("") to hide Today's date when I
>>>> initDialog, Then the user can
>>>> pick a date from the CDateTimeCtrl, but what if they try to delete/
>>>> empty the date they picked before? This part I do not know how. add a
>>>> button say "clear"
>>>> also, How could I know the DateTime is picked by the user or is the
>>>> underline datetime for SetFormat(""), or should I set a special date
>>>> so that I know the user did not pick a date?
>>>>
>>>> thanks again
>>>>
>>>> <sheng_ji...@hotmail.com.discuss> wrote:
>>>> e
>>>>> On Wednesday, March 26, 2008 11:47 AM Sheng Jiang[MVP] wrote:
>>>>> I am not suggesting changing the formating. I am suggesting the DTS_SHOWNONE
>>>>> style.
>>>>> Use SetTime/GetTime to get/set the time.A null time has a COleDateTime::null
>>>>> status.
>>>>>
>>>>> --
>>>>> Sheng Jiang
>>>>> Microsoft MVP in VC++
>>>>> Sheng Jiang
>>>>> Microsoft MVP in VC++
>>>>> "rockdale" <rockdal...@gmail.com> wrote in message
>>>>> news:f187b421-065f-4332...@m3g2000hsc.googlegroups.com...
>>>>> The first time I can use SetFormat("") to hide Today's date when I
>>>>> initDialog, Then the user can
>>>>> pick a date from the CDateTimeCtrl, but what if they try to delete/
>>>>> empty the date they picked before? This part I do not know how. add a
>>>>> button say "clear"
>>>>> also, How could I know the DateTime is picked by the user or is the
>>>>> underline datetime for SetFormat(""), or should I set a special date
>>>>> so that I know the user did not pick a date?
>>>>>
>>>>> thanks again
>>>>>
>>>>> On Mar 24, 1:16 pm, "Sheng Jiang[MVP]"
>>>>> <sheng_ji...@hotmail.com.discuss> wrote:
>>>>> message
>>>>> news:f187b421-065f-4332...@m3g2000hsc.googlegroups.com...
>>>>> The first time I can use SetFormat("") to hide Today's date when I
>>>>> initDialog, Then the user can
>>>>> pick a date from the CDateTimeCtrl, but what if they try to delete/
>>>>> empty the date they picked before? This part I do not know how. add a
>>>>> button say "clear"
>>>>> also, How could I know the DateTime is picked by the user or is the
>>>>> underline datetime for SetFormat(""), or should I set a special date
>>>>> so that I know the user did not pick a date?
>>>>>
>>>>> thanks again
>>>>>
>>>>> On Mar 24, 1:16 pm, "Sheng Jiang[MVP]"
>>>>> <sheng_ji...@hotmail.com.discuss> wrote:
>>>>>> On Wednesday, March 26, 2008 12:51 PM Doug Harrison [MVP] wrote:
>>>>>> On Wed, 26 Mar 2008 09:47:38 -0600, "Sheng Jiang[MVP]"
>>>>>> <sheng...@hotmail.com.discuss> wrote:
>>>>>>
>>>>>>
>>>>>> Last time I looked, DTS_SHOWNONE added a checkbox inside the control, and
>>>>>> when unchecked, simply grayed the text of the control. I never could get
>>>>>> the control to display nothing at all using DTS_SHOWNONE. The only way I
>>>>>> found was the SetFormat method I posted earlier.
>>>>>>
>>>>>> --
>>>>>> Doug Harrison
>>>>>> Visual C++ MVP
>>>>>> Doug Harrison
>>>>>> Visual C++ MVP
>>>>>>> On Wednesday, March 26, 2008 2:07 PM Sheng Jiang[MVP] wrote:
>>>>>>> The op wants to
>>>>>>> 1 pick the date that they visit,
>>>>>>> The op wants to
>>>>>>> 2 allow null which he thinks the CDateTimeCtrl does not support
>>>>>>> I just point out CDateTimeCtrl does support null values.
>>>>>>>
>>>>>>> I agree changing the formating will look nicer, but the feedback from data
>>>>>>> entry people is that masked editbox makes input faster.
>>>>>>>
>>>>>>> --
>>>>>>> Sheng Jiang
>>>>>>> Microsoft MVP in VC++
>>>>>>> "Doug Harrison [MVP]" <d...@mvps.org> wrote in message
>>>>>>> news:20vku39l4nu2vd42u...@4ax.com...
>>>>>>> DTS_SHOWNONE
>>>>>>> I just point out CDateTimeCtrl does support null values.
>>>>>>>
>>>>>>> I agree changing the formating will look nicer, but the feedback from data
>>>>>>> entry people is that masked editbox makes input faster.
>>>>>>>
>>>>>>> --
>>>>>>> Sheng Jiang
>>>>>>> Microsoft MVP in VC++
>>>>>>> "Doug Harrison [MVP]" <d...@mvps.org> wrote in message
>>>>>>> news:20vku39l4nu2vd42u...@4ax.com...
>>>>>>> COleDateTime::null
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