CListView & HDN_ENDTRACK - there stay vertical lines

[s_k]

Hi,
in my CListView-derived class I added handler for HDN_ENDTRACKW notification, which looks like this:

void CMyFileView::OnEndColumnResizing(NMHDR* pNMHDR, LRESULT* pResult)
{
    *pResult = 0;
} 

The problem is, that now, after having added this handler, when I'm resizing any column (dragging the divider) and I finish dragging, there stays vertical line pointing from divider perpendicularly to the bottom of ListView. When I handle only HDN_BEGINTRACKW (and set *pResult to 0), everything is ok.

What's the problem with that?

Thank you.

[tobias.loew]

After partying 10th anniversary of this problem I finally found a solution for it.

Short story: call CWnd::Default from your HDN_ENDTRACK-handler

Long story:
Just recently I had the same problem and figured out that HDN_ENDTRACK is not only a notification for the end-user, but also a necessary message for the correct drawing (i.e. removing the vertical lines) of the parent list-ctrl: the drawing problem arises the moment you install an MFC-notify-handler for HDN_ENDTRACK.
The difference is then in the function

// code from MFC: wincore.cpp lines 2133-2140 (MSVC 11, VS 2012)
LRESULT CWnd::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
    // OnWndMsg does most of the work, except for DefWindowProc call
    LRESULT lResult = 0;
    if (!OnWndMsg(message, wParam, lParam, &lResult))
        lResult = DefWindowProc(message, wParam, lParam);
    return lResult;
}

that for the HDN_ENDTRACK-notification OnWndMsg will return TRUE if and ony if there is a handler for it and thus, if there is a handler won't call DefWindowProc.
As there doesn't exists a OnNotifyEx-handler (blame whoever you want) IMO the best way to handle it is calling CWnd::Default() from your HDN_ENDTRACK-handler.

regards

Tobias

Hi,
in my CListView-derived class I added handler for HDN_ENDTRACKW notification, which looks like this:

void CMyFileView::OnEndColumnResizing(NMHDR* pNMHDR, LRESULT* pResult)
{
    *pResult = 0;
} 

The problem is, that now, after having added this handler, when I'm resizing any column (dragging the divider) and I finish dragging, there stays vertical line pointing from divider perpendicularly to the bottom of ListView. When I handle only HDN_BEGINTRACKW (and set *pResult to 0), everything is ok.

What's the problem with that?

Thank you.