CXTTipWindow

Hi Giovanni:

If you are interested here is the code for a derivative of CXTTipWindow that will make sure the popup fully displays (provided it is not too big to fit) on the screen. In cases where there is more than one monitor then the tip will display on the same monitor that contains the mouse pointer. Actually, I found that this is the only way to make the tip show up at all.

Ignore the class name, I pulled the code from a class that has many more mods including Notifications to parent to allow updating of the tooltip text just before displaying the tip. Hence the suffix Notify.

Header File


class _XT_EXT_CLASS CXTTipWindowNotify : public CXTTipWindow
{
public:
    // Summary: Constructs a CXTTipWindowNotify object
    CXTTipWindowNotify() { };
    // Summary: Destroys a CXTTipWindowNotify object, handles cleanup and de-allocation
    virtual ~CXTTipWindowNotify() { };
    
    // Summary: Call this member function to hide the tip window
    virtual BOOL ShowTipWindow(const CPoint& point, DWORD dwTipStyle=TWS_XT_DROPSHADOW, UINT nDelay=0, UINT nElapse=5000, BOOL bCenterHorz = FALSE);
};

CPP File


BOOL CXTTipWindowNotify::ShowTipWindow(const CPoint& point, DWORD dwTipStyle, UINT nDelay, UINT nElapse, BOOL bCenterHorz)
{
    BOOL bRetVal = CXTTipWindow::ShowTipWindow(point, dwTipStyle, nDelay, nElapse, bCenterHorz);
    if (bRetVal)
    {
        CRect rc;
        CRect rc2;
        CPoint pt;
        GetCursorPos(&pt);
        HMONITOR hMon = MonitorFromPoint(pt, MONITOR_DEFAULTTONEAREST);
        MONITORINFO monInfo;
        bool bChanged = false;
        monInfo.cbSize = sizeof(monInfo);
        if (hMon && GetMonitorInfo(hMon, &monInfo))
        {
              rc = monInfo.rcMonitor;
        }
        else
        {
              // can't get mon info, just use desktop
              ::GetClientRect(::GetDesktopWindow(), &rc);
        }
        InitializeSize(m_ptMousePos, m_bCenterHorz); //Calculates m_rcScreenWindow values
        rc2 = m_rcScreenWindow;
        if (rc2.left < rc.left)
        {
              // move right
              int nDelta = rc.left - rc2.left;
              m_ptMousePos.x += nDelta;
              m_rectTipArea.right -= nDelta;
              bChanged = true;
        }
        else if (rc2.right > rc.right)
        {
              // move left
              int nDelta = rc2.right - rc.right;
              m_ptMousePos.x -= nDelta;
              m_rectTipArea.left += nDelta;
              // this is needed to make the tooltip hide as soon as you cross over the monitor boundary
              if (m_rectTipArea.right+m_ptMousePos.x > rc.right) m_rectTipArea.right = rc.right - m_ptMousePos.x;
              bChanged = true;
        }
        if (!nDelay && bChanged)
        {
              // lets move the tip it is already displayed
              InitializeSize(m_ptMousePos, m_bCenterHorz); //Calculates m_rcScreenWindow values
              SetWindowPos(&wndTop, m_rcScreenWindow.left, m_rcScreenWindow.top, m_rcScreenWindow.Width(), m_rcScreenWindow.Height(), SWP_SHOWWINDOW|SWP_NOACTIVATE);
        }
    }
    return bRetVal;
}