Displaying Information in a CTreeView ToolTip

This article was contributed by John Czopowik.

Environment:

There is some confusion in the MFC world regarding CTreeView and tooltips. It seems as though the conservative approach of handling TTN_NEEDTEXTW and TTN_NEEDTEXTA notification messages does not work for some, known-only-to-Microsoft, reason. The following code requires comctl32.dll version 4.71 or later. Windows with IE ver 4.0 has this DLL updated already. A newer tree common control has an additional style: You can use the setting style of tree view: TVS_INFOTIP. In turn, the tree control will send notification message TVN_GETINFOTIP when the control is requesting text for tooltips. The handler receives a pointer to NMTVGETINFOTIP structure that has information about the tree item.

In this example, I set tootips to an item text. In the header file of the CTreeView derived class, declare a message handler:

afx_msg void OnTvnGetInfoTip NMHDR pNMHDR LRESULT pResult

And in cpp, use following macro:

BEGIN_MESSAGE_MAP (CTreeViewTestView, CTreeView)
    .
    .
    .
    ON_NOTIFY_REFLECT (TVN_GETINFOTIP, OnTvnGetInfoTip)
END_MESSAGE_MAP()

And define the handler:

void CTestTreeView::OnTvnGetInfoTip(NMHDR *pNMHDR, 
                                    LRESULT *pResult)

{
  LPNMTVGETINFOTIP pGetInfoTip = (LPNMTVGETINFOTIP)pNMHDR

  CString csItemTxt = 
     m_TreeCtrl.GetItemText(pGetInfoTip->hItem);

  strcpy(pGetInfoTip->pszText, csItemTxt);

  *pResult = 0;

}

Don't forget to add a ModifyStyle command in OnInitialUpdate:

GetTreeCtrl().ModifyStyle(0,
                          TVS_HASLINES |
                          TVS_LINESATROOT |
                          TVS_HASBUTTONS |
                          TVS_INFOTIP



About the Author

John Z. Czopowik VC++ MVP

Microsoft VC++ MVP

Comments

  • Using this Method with Visual C++ Version 5

    Posted by sweeneymini on 06/16/2005 07:12am

    I have the upto date MFC DLL AFAIK, so can I use the new functionality of this version (e.g. using TVN_GETINFOTIP) or am I restricted to using what MFC version it came with?

    Reply
  • Delay Time ?

    Posted by Legacy on 06/03/2003 12:00am

    Originally posted by: Yury

    This samble very good and simple. But i have unpleasant problem with delay time. 
    
    This code does not make any effect. WHY ???

    CToolTipCtrl* pTTCtrl = MyTree.GetToolTips();
    if(pTTCtrl != NULL)
    {
    pTTCtrl->SetDelayTime(TTDT_AUTOPOP, 2000);
    pTTCtrl->SetDelayTime(TTDT_INITIAL, 2000);
    pTTCtrl->SetDelayTime(TTDT_RESHOW, 2000);
    }

    The tooltipCtrl of tree use default value=500 anyway.

    • Delay Time ?

      Posted by yotamwimmer on 12/12/2010 05:41pm

      Were you able to solve this issue?

      Reply
    Reply
  • tree_view_newbie

    Posted by Legacy on 11/18/2002 12:00am

    Originally posted by: c_k


    Would need some easy Tutorial, to implement a Tree View.
    Your exampe might be good, but where to insert the code.
    (SDI ?, Doc/View ?????)

    Reply
  • Some corrections

    Posted by Legacy on 08/28/2002 12:00am

    Originally posted by: Giraud

    message handler:
    
    

    afx_msg void OnTvnGetInfoTip (NMHDR* pNMHDR, LRESULT* pResult);

    and some ";" in the source code

    don't forget to remove TVS_NOTOOLTIPS style
    when you add TVS_INFOTIP

    ModifyStyle(TVS_NOTOOLTIPS, TVS_INFOTIP);

    and it works correctly !

    Reply
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