NM_RDBLCLK not working for CTreeCtrl

[Jochen Arndt]

Not a solution but some thoughts. Your parent view has a context menu handler. As a result that will be always called before the NM_RDBLCLK handler when the tree control does not handle it:

WM_CONTEXTMENU message (Windows)[^]:

If a window does not display a shortcut menu it should pass this message to the DefWindowProc function. If a window is a child window, DefWindowProc sends the message to the parent. Otherwise, DefWindowProc displays a default shortcut menu if the specified position is in the window's caption.

If you have a context menu (in the parent and/or child) it will be shown before the NM_RDBLCLK handler is called. Then there should be no reason to act upon double clicks too. The message will even not being generated when the mouse is over the meanwhile opened popup menu when the second click occurs.

[_Flaviu]

Yes, I see your point, but I don't have any right click, or contextMenu, or shortcut menu handler neither in CMyView (derived from CFormView), neither in my CTreeCtrl object (IDC_TREE1) ... or, I miss something ?

[Jochen Arndt]

From your initial post:

afx_msg void OnContextMenu(CWnd* pWnd, CPoint point);

That is an MFC handler for WM_CONTEXTMENU.

[_Flaviu]

Yes, that was the default code put there by MFC wizard, but there was not mapped in the message map ... anyway, I have commented up, and that was change nothing.

[Jochen Arndt]

It is sufficient to comment the message map entries (which should be created too by the wizard). By the presence of the context menu handler I assumed that you want to use it. All I can think of is that the NM_RDBLCLK notification is not send by some processing in the default (right mouse button related) MFC CWnd or derivatives handlers. Another source of not getting the notification might be handling the message in your derived tree control using ON_NOTIFY_REFLECT(). If so, use ON_NOTIFY_REFLECT_EX() instead and return FALSE to get the notification passed to the parent.

[_Flaviu]

Thank you for your time, Jochen. No, I am not using any derived CTreeCtrl, so, I cannot use anything than ON_NOTIFY notification.

[Victor Nijegorodov]

Be sure that your CTreeCtrl has the CS_DBLCLKS class style. Try to handle WM_RBUTTONDBLCLK message.

[_Flaviu]

I have tried double-click too, not working:

ON\_NOTIFY(NM\_RDBLCLK, IDC\_TREE1, &CTestTreeView::OnNMRDblclkTree1)
ON\_NOTIFY(NM\_DBLCLK, IDC\_TREE1, &CTestTreeView::OnNMDblclkTree1)

void CTestTreeView::OnNMRDblclkTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
// TODO: Add your control notification handler code here

MessageBox(\_T("Right dbl-click"));

\*pResult = 0;

}

void CTestTreeView::OnNMDblclkTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
// TODO: Add your control notification handler code here

MessageBox(\_T("Left dbl-click"));

\*pResult = 0;

}

I modified the control style, as follow:

void CTestTreeView::OnInitialUpdate()
{
CFormView::OnInitialUpdate();
GetParentFrame()->RecalcLayout();

m\_Tree.ModifyStyle(0, CS\_DBLCLKS);

ResizeParentToFit();

}

where m_Tree is my CTreeCtrl object.

[Victor Nijegorodov]

_Flaviu wrote:

m_Tree.ModifyStyle(0, CS_DBLCLKS);

No, it won't work! just because CS_DBLCLKS is not a window style. It is a window class style! But forget this! Note that double-click in a tree control is used by default to expand/collapse tree items! So these messages are handled by control itself and therefore you cannot handle them in your code.

[_Flaviu]

Yes, you are right, I guess this messages (double-click, and right double click) are handled by the control, that is why I cannot catch them. Thank you !

[Victor Nijegorodov]

You could subclass the Tree Control (in your own class derived from CTreeCtrl). In the derived class implement the ON_NOTIFY_REFLECT_EX macro to handle left/right double click and then pass (or not) this message for the further handling.