void CDaoRecordView::OnInitialUpdate()
{
ASSERT_VALID(this);
CDaoRecordset* pRecordset = OnGetRecordset();
// recordset must be allocated already
ASSERT(pRecordset != NULL);
if (!pRecordset->IsOpen())
{
CWaitCursor wait;
pRecordset->Open();
}
if (!pRecordset->IsEOF())
{
// Determine recordset properties for move button enabling
if (pRecordset->CanBookmark())
{
// Get the bookmark of the first record
m_varBookmarkCurrent = pRecordset->GetBookmark();
m_varBookmarkFirst = m_varBookmarkCurrent;
}
// Enable forward scrolling buttons
m_nStatus |= AFX_DAOVIEW_SCROLL_NEXT;
// Enable backward scrolling buttons if possible
if (pRecordset->CanScroll())
{
m_nStatus |= AFX_DAOVIEW_SCROLL_LAST;
m_nStatus |= AFX_DAOVIEW_SCROLL_BACKWARD;
}
else
{
m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
}
}
else
{
// Disable scrolling
m_nStatus &= ~AFX_DAOVIEW_SCROLL_NEXT;
m_nStatus &= ~AFX_DAOVIEW_SCROLL_LAST;
m_nStatus &= ~AFX_DAOVIEW_SCROLL_BACKWARD;
}
CFormView::OnInitialUpdate();
}
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;
}