C / C++ / MFC

BOOL CDialogMenu::TrackWindow()
{
	if( m_rcExclude.left == __BADPOSITION )
		return FALSE;

	CRect rectWindow;

	WINDOWPLACEMENT wndpl;
	wndpl.length = sizeof(WINDOWPLACEMENT);
	if( !GetWindowPlacement( &wndpl ) )
		return FALSE;

	rectWindow = wndpl.rcNormalPosition;

	//GetWindowRect(&rectWindow);
	int cx = ::GetSystemMetrics(SM_CXSCREEN);
	int cy = ::GetSystemMetrics(SM_CYSCREEN);

	// Set prefered position
	rectWindow.SetRect(
		m_rcExclude.left,m_rcExclude.bottom,
		m_rcExclude.left+rectWindow.Width(),
		m_rcExclude.bottom+rectWindow.Height());

	// Center relative to exclusion rectangle?
	if( m_bCenter )
		rectWindow.OffsetRect(-((rectWindow.Width() + 					m_rcExclude.Width())>>1),0);
	
	// Too far right?
	if (rectWindow.right > cx)
		rectWindow.OffsetRect(-(rectWindow.right - cx), 0);

	// Too far left?
	if (rectWindow.left < 0)
		rectWindow.OffsetRect( -rectWindow.left, 0);

	// Too far down? Move to top of exclustion rectangle.
	if (rectWindow.bottom > cy)
		rectWindow.OffsetRect(0,-(m_rcExclude.Height() + 				rectWindow.Height()));

	// Move to new position
	//MoveWindow(rectWindow, TRUE);
	wndpl.rcNormalPosition = rectWindow;
	SetWindowPlacement( &wndpl );

	return FALSE;
}

void CalcMenuLocation ( HMENU menu, const RECT& rcBtn,
                        POINT& ptMenuLocation, UINT& uFlags )
{
POINT pt = { rcBtn.left, rcBtn.bottom };
UINT  uMenuFlags    = 0;
UINT  uItemCnt      = GetMenuItemCount ( menu );
int   nMenuHeight   = uItemCnt * GetSystemMetrics ( SM_CYMENUSIZE );
int   nScreenHeight = GetSystemMetrics ( SM_CYSCREEN );
 
    if ( nMenuHeight + pt.y > nScreenHeight )
        {
        // Reposition the menu so its bottom is aligned with the top
        // edge of the button.
 
        uMenuFlags |= TPM_BOTTOMALIGN;
        pt.y = rcBtn.top;
        }
 
    ptMenuLocation = pt;
    uFlags |= uMenuFlags;
}

LRESULT CSearchBar::OnToolbarDropdown ( NMHDR* phdr )
{
NMTOOLBAR* pnmtb = (NMTOOLBAR*) phdr;
HMENU      hmenu, hPopup;
RECT       rcItem = pnmtb->rcButton;
 
    hmenu = AtlLoadMenu ( IDR_YOUR_MENU_HERE );
 
    if ( NULL == hmenu )
        return TBDDRET_DEFAULT;
 
    hPopup = GetSubMenu ( hmenu, 0 );
    ATLASSERT ( NULL != hPopup );
 
POINT ptMenuLocation;
UINT  uFlags = TPM_LEFTALIGN | TPM_LEFTBUTTON | TPM_RETURNCMD;
int   nMenuItem;
 
    ClientToScreen ( &rcItem );
    CalcMenuLocation ( hPopup, rcItem, ptMenuLocation, uFlags );
 
    nMenuItem = (int) TrackPopupMenu ( hPopup, uFlags,
                                       ptMenuLocation.x, ptMenuLocation.y,
                                       0, m_hWnd, NULL );
}