Tree Control Shift + MouseWheel

If you are using CTreeCtrl in a dialog derive your class and handle TVN_SELCHANGING notification.

Use code below:

void CScrollTreeView::OnSelchanging(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
*pResult = 0;

if((GetAsyncKeyState(VK_SHIFT) < 0) && !m_LButtonDnFlag)
{
TRACE("%d\n", m_LButtonDnFlag);

*pResult = 1;
}

m_LButtonDnFlag = FALSE;
}


Since TVN_SELCHANGING handler is not call when mouse left button is down, I used flag that is initially set to false and set TRUE in WM_LBUTTONDOWN handler.
It is done to allow selection with shift and mouse button down.

You are welcome.