How to detect mousedown event in ctree control in mfc

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I have one tree control on my dialog i want to show the checked item
see we can select multiple checkboxes i want to show last checked item

What I have tried:

void CTreeSetControlDlg::OnNMClickTreereletion(NMHDR *pNMHDR, LRESULT *pResult)
{
	// TODO: Add your control notification handler code here
	// Select the item that is at the point myPoint.
	static int i=0;
	CString m;
	HTREEITEM hItem=NULL;
	if(WM_LBUTTONDOWN)
	{
		hItem=m_treeRel.GetSelectedItem();
		m=m_treeRel.GetItemText(hItem);
		//m.Format(_T("Captured...%d"),i);
		ShowMessage(m);
		i++;
	}

	*pResult = 0;
}

Posted 6-Feb-17 17:39pm

Premnath Mali

Updated 6-Feb-17 21:01pm

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Jochen Arndt · Accepted Answer · 2017-02-06T21:01:00

You are handling the NM_CLICK notification which is send when clicking the left button within the tree control. So there is no need to check if the left button is down.

But when this message is handled by your code, the default handling has not yet been called so that the clicked item is not yet selected.

To get the clicked item you can use something like

UINT uFlags = 0;
CPoint pt(0, 0);
GetCursorPos(&pt);
m_treeRel.ScreenToClient(&pt);
HTREEITEM hItem = m_treeRel.HitTest(pt, &uFlags);
if(NULL != hItem && (TVHT_ONITEM  & uFlags))
{
    // Do something with clicked item
}

It is not quite clear what you finally want to achieve. But there are often multiple notifications and messages that might be used for specific tasks. So you should also have a look at these. A candidate might be the TVN_SELCHANGING notification code (Windows)[^].