C++ (Cpp) IsOnFirstRecord Examples

Example #1

File: dbview.cpp Project: Rupan/winscp

void CRecordView::OnUpdateRecordFirst(CCmdUI* pCmdUI)
{
    CRecordset* prs = OnGetRecordset();

    // enable if opened, can scroll backwards,
    pCmdUI->Enable(prs->IsOpen() && prs->CanScroll() &&
                   // >= 1 records present and not already on first record
                   !(prs->IsEOF() && prs->IsBOF()) && !IsOnFirstRecord());
}

Example #2

File: daoview.cpp Project: rickerliang/OpenNT

BOOL CDaoRecordView::OnMove(UINT nIDMoveCommand)
{
	ASSERT_VALID(this);

	CDaoRecordset* pSet = OnGetRecordset();
	if (pSet->CanUpdate())
	{
		pSet->Edit();
		if (!UpdateData())
			return TRUE;

		pSet->Update();
	}

	BOOL bBookmarkable = pSet->CanBookmark();
	BOOL bScrollable = pSet->CanScroll();

	switch (nIDMoveCommand)
	{
		case ID_RECORD_PREV:
			pSet->MovePrev();

			if (!pSet->IsBOF())
			{
				if (bBookmarkable)
					m_varBookmarkCurrent = pSet->GetBookmark();

				// Enable forward scrolling
				m_nStatus |= AFX_DAOVIEW_SCROLL_NEXT;

				if (bScrollable)
				{
					m_nStatus |= AFX_DAOVIEW_SCROLL_LAST;

					if (IsOnFirstRecord())
						// Disable backward scrolling
						m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
					else
						m_nStatus |= AFX_DAOVIEW_SCROLL_BACKWARD;
				}
				else
				{
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
				}


				break;
			}
			// Fall through to reset to first record

		case ID_RECORD_FIRST:
			pSet->MoveFirst();

			// backward scrolling never allowed after movefirst
			m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;

			if (pSet->IsEOF())
			{
				// Empty recordset, disable forward too
				m_nStatus &= ~AFX_DAOVIEW_SCROLL_NEXT;
				m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
			}
			else
			{
				if (bBookmarkable)
				{
					m_varBookmarkCurrent = pSet->GetBookmark();
					m_varBookmarkFirst = m_varBookmarkCurrent;
				}

				// Enable forward scrolling
				m_nStatus |= AFX_DAOVIEW_SCROLL_NEXT;

				if (bScrollable)
					m_nStatus |= AFX_DAOVIEW_SCROLL_LAST;
				else
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
			}

			break;

		case ID_RECORD_NEXT:
			pSet->MoveNext();

			if (!pSet->IsEOF())
			{
				if (bBookmarkable)
					m_varBookmarkCurrent = pSet->GetBookmark();

				if (IsOnLastRecord())
				{
					// Disable forward scrolling
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_NEXT;
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
				}
				else
				{
					m_nStatus |= AFX_DAOVIEW_SCROLL_NEXT;
					m_nStatus |= AFX_DAOVIEW_SCROLL_LAST;
				}

				if (bScrollable)
					m_nStatus |= AFX_DAOVIEW_SCROLL_BACKWARD;
				else
				{
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
				}

				break;
			}

			// Can't fall through to move last
			if (!bScrollable)
			{
				// At the end of forward only recordset
				m_nStatus &= ~AFX_DAOVIEW_SCROLL_NEXT;
				m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
				m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
				break;
			}

			// Fall through to reset to last record

		case ID_RECORD_LAST:
			pSet->MoveLast();

			// forward scrolling never allowed after movelast
			m_nStatus &= ~AFX_DAOVIEW_SCROLL_NEXT;
			m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;

			if (pSet->IsBOF())
			{
				// Empty recordset, disable backward too
				m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
			}
			else
			{
				if (bBookmarkable)
				{
					m_varBookmarkCurrent = pSet->GetBookmark();
					m_varBookmarkLast = m_varBookmarkCurrent;
				}

				// Enable backward scrolling
				if (bBookmarkable)
					m_nStatus |= AFX_DAOVIEW_SCROLL_BACKWARD;
				else
					m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
			}

			break;

		default:
			// Unexpected case value
			ASSERT(FALSE);
	}

	// Show results of move operation
	UpdateData(FALSE);
	return TRUE;
}