Solved

How get a checked/unchecked message from CTreeCtrl?

Posted on 2004-03-25
6
793 Views
Last Modified: 2013-11-20
How do I determine when the user is un/cheking a check box in a
 tree. What  notification message is sent?

0
Comment
Question by:robter_x
6 Comments
 
LVL 16

Accepted Solution

by:
nonubik earned 50 total points
ID: 10686858
I presume you use a CTreeCtrl with TVS_CHECKBOXES.
I couldn't find any standard notification message, but I have an workarround: you may wait NM_CLICK and verify wether the checkbos is checked or not  (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/treeview/treeview.asp ,the last example in "Working with state image indexes") .
0
 
LVL 14

Expert Comment

by:_Stilgar_
ID: 14541570
I know it must be way too late now, but anyway, for the knowledgebase:
There is a better way - derive a class from CTreeCtrl and override with this one:

void CTreeCtrlEx::OnLButtonDown(UINT nFlags, CPoint point)
{
      UINT uFlags=0;
      HTREEITEM hItem = HitTest(point,&uFlags);

      if( uFlags & TVHT_ONITEMSTATEICON )
      {
            AfxMessageBox("Checked/unchecked");
            // determine by using GetCheck(hItem)
            // you can send a custom message if you want.
            return;
      }

      CTreeCtrl::OnLButtonDown(nFlags, point);
}

Stilgar.
0
 
LVL 1

Expert Comment

by:thready
ID: 21309279
Hi Stilgar,

I was just looking over these responses - it's been a long time, but maybe you can remember...  I subclassed CTreeCtrl and provided the virtual function to override OnLButtonDown as you said to do, but my function is not being called.  Do I absolutely need a message map so that it is called?  I'm not sure what to use as a message map if that's the case - how do you determine which dialog ID to use and still have a generic class?

Thanks for your help,
Mike
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 14

Expert Comment

by:_Stilgar_
ID: 21316759
Hi,

Its been a while since I touched MFC GUI controls... AFAIR just overriding the function should do, but I may as well be wrong. Try creating the OnLButtonDown function in your sub-class using the MFC wizards - this should create whatever is needed for this function to work. Also, make sure you're not overriding this message elsewhere (for example in PreTranslateMessage).

Stilgar.
0
 
LVL 1

Expert Comment

by:thready
ID: 21318011
Thanks Stilgar, I'll give that a try..
0
 
LVL 1

Expert Comment

by:rkursem
ID: 33074356
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I'll describe -- and show pictures of -- some of the significant additions that have been made available to programmers in the MFC Feature Pack for Visual C++ 2008.  These same feature are in the MFC libraries that come with Visual …
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now