Forum

Hello,

based on the following code:

CExtGridCell * pCell = ReportItemGetCell( pPB, pRGI, RUNTIME_CLASS( CExtGridCellDateTime ) );
pCell->TextSet(timedate_str);

How can I make the date picker control enabled readonly? With pCell->ModifyStyle(__EGCS_READ_ONLY) the whole cell would be readonly with the date picker being totally disabled.

Martin

Now everything is working like it should, thank you!

Martin

Using your implementation I get two compiler errors:

Error 26 error C2665: ’CExtGridCell::operator new’ :
	none of the 2 overloads could convert all the argument types
Error 27 error C2664: ’CExtGridCellDateTime::CExtGridCellDateTime(CExtGridDataProvider *)’ :
	cannot convert parameter 1 from ’const CExtGridCell’ to ’CExtGridDataProvider *’

The second conflict could be solved by using the following code for the copy constructor instead:

CMyGridCell::CMyGridCell( const CExtGridCell & other )
{
	CExtGridCellDateTime::Assign(other);
}

Is this ok?

But for the first error I could not find any solution that makes it work. It comes up with the following line:

IMPLEMENT_SERIAL( CMyGridCell, CExtGridCellDateTime, VERSIONABLE_SCHEMA|1 );

Any idea?

Martin

Please read this FAQ article:

I derived a class from CExtGridCell but it fails to be compiled, what may be wrong?

If the problem persists, just let us know.

Thank you very much for this!

Martin

My Idea: I want to show (localized, readonly) timestamps as strings in one column of a report grid.

How can I guarantee the correct sort order without depending on the date picker control, i.e. can I use the sorting benefits of type CExtGridCellDateTime without having to display the triangle button for the date picker?

Martin

You should use a CExtGridCellDateTime-derived class, which implements a custom comparison algorithm:

class CMyGridCell : public CExtGridCellDateTime
{
public:
    DECLARE_SERIAL( CMyGridCell );
    IMPLEMENT_ExtGridCell_Clone( CMyGridCell, CExtGridCellDateTime );
    CMyGridCell(
        CExtGridDataProvider * pDataProvider = NULL
        );
    CMyGridCell( const CExtGridCell & other );
    virtual int Compare(
        const CExtGridCell & other,
        DWORD dwStyleMask = __EGCS_COMPARE_MASK,
        DWORD dwStyleExMask = __EGCS_EX_COMPARE_MASK
        ) const;
}; // class CMyGridCell



IMPLEMENT_SERIAL( CMyGridCell, CExtGridCellDateTime, VERSIONABLE_SCHEMA|1 );
 
CMyGridCell::CMyGridCell(
    CExtGridDataProvider * pDataProvider // = NULL
    )
    : CExtGridCellDateTime( pDataProvider )
{
}
 
CMyGridCell::CMyGridCell( const CExtGridCell & other )
    : CExtGridCellDateTime( other )
{
}
int CMyGridCell::Compare(
    const CExtGridCell & other,
    DWORD dwStyleMask, // = __EGCS_COMPARE_MASK
    DWORD dwStyleExMask // = __EGCS_EX_COMPARE_MASK
    ) const
{
    ASSERT_VALID( this );

    ...

    return ...
}

Thank you for answering.

By the way, you supply a great forum, always helpful and friendly, thank you!

Unfortunately the popup CExtDatePickerWnd date picker control does not support the read only mode. We can only regard your question as a feature request.