Never notify HDN_TRACK message of CListCtrl's CHeaderCtrl

I want to catch HDN_TRACK message from listCtrl's header, but it's never notified.

I tested HDN_BEGINTRACK and HDN_ENDTRACK, and these are working well.

I also changed the Control Id of message map to IDC_TEST_LIST and 0, there was no difference - it is still not working.

I searched many forums, but I couldn't find any solution.

Here's my test code.


BEGIN_MESSAGE_MAP(CDlgTest, CDialogEx)
    //ON_NOTIFY(HDN_BEGINTRACK, 0, &CDlgTest::OnTrackListTest) // WORKING!!
    //ON_NOTIFY(HDN_ENDTRACK, 0, &CDlgTest::OnTrackListTest) // WORKING!!
    //ON_NOTIFY(HDN_TRACK, IDC_TEST_LIST, &CDlgTest::OnTrackListTest) // NOT WORKING
    ON_NOTIFY(HDN_TRACK, 0, &CDlgTest::OnTrackListTest)   // NOT WORKING
END_MESSAGE_MAP()


void CDlgTest::OnTrackListLog(NMHDR* pNMHDR, LRESULT* pResult)
{
    LPNMHEADER phdr = reinterpret_cast<LPNMHEADER>(pNMHDR);
    // TODO: Add your control notification handler code here

    AfxMessageBox(L"Hello!!!");     // >>>>>>>>>>> NOT showing up

    *pResult = 0;
}


class CDlgTest : public CDialogEx {
    
public:
    afx_msg void OnTrackListLog(NMHDR* pNMHDR, LRESULT* pResult);
}

I append some forums that I visited:

What can I try next?

Solution

This is an odd behavior with header control, it's described in HDN_TRACK and HDS_FULLDRAG also posted by @Constantine

You have to remove HDS_FULLDRAG style from header control in OnInitDialog:

m_list.GetHeaderCtrl()->ModifyStyle(HDS_FULLDRAG, 0);

Then you should receive HDN_TRACK message

void CDlgTest::OnTrack(NMHDR* pNMHDR, LRESULT* pResult)
{
    TRACE(L"OnTrack\n");
    *pResult = 0;
}

ON_NOTIFY(HDN_TRACK, 0, OnTrack)

But now you don't have HDS_FULLDRAG style! If HDS_FULLDRAG flag is required, then don't change in OnInitDialog. Instead, you can enable/disable HDS_FULLDRAG in response to HDN_BEGINTRACK/HDN_ENDTRACK