void CBCGPGridCtrl::EnableVirtualMode	(	BCGPGRID_CALLBACK	pCallback = NULL,
		LPARAM	lParam = 0
	)

Enables virtual mode.

Call this function to enable virtual mode. When the virtual mode has been enabled, you cannot disable it anymore. If you have no callback function, and pCallback is NULL, then the grid will send BCGPGN_GETDISPINFO (currently it's the same as LVN_GETDISPINFO) notification message to its owner. In that case you should handle this notification message, fill up and return TRUE.

The callback function has the following prototype:

BOOL CALLBACK CallbackFunc (BCGPGRID_DISPINFO*, LPARAM);

Parameters

pCallback	Points to a callback function
lParam	Used to pass a user-defined value to the callback function.

Example 1:

Copy

static BOOL CALLBACK GridCallback (BCGPGRID_DISPINFO* pdi, LPARAM lp)

{

ASSERT (pdi != NULL);

CMyGridCtrl* pGridCtrl = (CMyGridCtrl *) lp;

int nRow = pdi->item.nRow; // Row of an item

int nCol = pdi->item.nCol; // Column of an item

CString str;

str.Format(_T("Callback %d, %d"), nRow, nCol);

pdi->item.varValue = (LPCTSTR) str;

return TRUE;

}

int CMyGridCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

//...

EnableVirtualMode(GridCallback, (LPARAM) this);

}

Example 2:

Copy

BOOL CGridView::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)

{

ASSERT_VALID (this);

CBCGPGridCtrl* pGridCtrl = GetGridCtrl ();

ASSERT_VALID (pGridCtrl);

if (wParam == (WPARAM)pGridCtrl->GetDlgCtrlID())

{

*pResult = TRUE;

BCGPGRID_DISPINFO <em>pdi = (BCGPGRID_DISPINFO</em>)lParam;

if (BCGPGRID_DISPINFO == pdi->hdr.code)

{

int nRow = pdi->item.nRow; // Row of an item

int nCol = pdi->item.nCol; // Column of an item

CString str;

str.Format(_T("Message %d, %d"), nRow, nCol);

pdi->item.varValue = _variant_t (str);

return TRUE;

}

}

return CView::OnNotify(wParam, lParam, pResult);

}

See also

CBCGPGridCtrl::SetVirtualRows