Problem with event management with TreeView in MFC

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I have a TreeView Control in MFC.

what i did is, i put some elements in a way into that tree such that, the depth0 elements are alphabets and the depth one elements are numbers as below:-

|
MyTree
| A
| |--1
| |--2
| |--3
|
|---B
| |--4
| |--5
| |--6
|
|---C
| |--7
| |--8
| |--9

Now, i want, when i double click the alphabets, it displays message, that alphabet is chosen, and if i double click numbers, it displays message, that number is chosen.

I even dont know, how to implement the double click event on its items. How to implement this whole thing in..??

Posted 30-May-12 15:01pm

Harmanjeet Singh

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Sergey Alexandrovich Kryukov 30-May-12 21:51pm

Is MSDN broken where you work? :-)
What did you try? What's the problem?
--SA

stib_markc 31-May-12 1:23am

Try TVN_SELCHANGE messages, as SA said. TVN(Tree View Notification)..

2 solutions

Solution 2

SAKryukov gave you some very important information, I want to add some with this:
You can Process WM_NOTIFY windows message and NM_CLICK action, you can get the proper Tree Object

here is a simple example:

C++

case WM_NOTIFY:
NMHDR *nmhdr;
nmhdr=(NMHDR *)lParam;
switch(nmhdr->code)
{
  case NM_CLICK:
  TVHITTESTINFO tv;
  HTREEITEM htr,htr_tblName;
  RECT rc_tree;
  POINT ms_pt;
  GetCursorPos(&ms_pt);
  GetWindowRect(nmhdr->hwndFrom, &rc_tree);
  tv.pt.x=ms_pt.x-rc_tree.left;
  tv.pt.y=ms_pt.y-rc_tree.top;
  htr=TreeView_HitTest(nmhdr->hwndFrom,&tv); //here is the object of the leaf that got clicked
  
}

good luck

Posted 30-May-12 16:45pm

Mohibur Rashid

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-05-30T15:49:00

You need to handle TVN_SELCHANGING and TVN_SELCHANGED notification messages. Item selection is explained here:
http://msdn.microsoft.com/en-us/library/a9a9f1t7%28v=vs.100%29.aspx[^].

The example here shows how you get the currently selected item:
http://www.codersource.net/MFC/MFCTutorials/MFCTreeusageandexample.aspx[^].

Basically, that's all you need. Now when you know what to look for (keywords for Web search), you can try to find some more detailed code samples.

Good luck,

—SA