Tooltips For Tree Control Items

Changing the tool tip as the mouse pointer moves along different tree control items is fairly simple. The tree control can be on a dialog, property page or a form view. Assuming that you use a class derived from CFormView called CMyFormView, which has a tree control, the steps to follow are:
  1. Declare a member variable for the tree control (IDC_TREE1), m_tree.
  2. Decide on how the tip for each tree item will be stored. For instance, you could hold the tip in a map which you declare in the header file CMyFormView.h.
    	CMap< HTREEITEM,HTREEITEM&,CString,CString& > tooltipMap;
  3. Fill the map as you generate the items of the tree. For instance after every InsertItem:
    	HTREEITEM hItem = m_tree.InsertItem(&tvItem); // tvItem is of type TV_INSERTSTRUCT
    	tooltipMap[hItem] = " Tool Tip Text   ";   // Set the tool tip text of the item.
    	
  4. Declare an object of CToolTipCtrl in the header file CMyFormView .h
    	CToolTipCtrl m_tooltip;
  5. Create the tool tip control and initialize it in the OnInitialUpdate message handler (OnInitDialog for CDialog derived classes)
    	m_tooltip.Create(this);
    	m_tooltip.Activate(TRUE);
    	m_tooltip.AddTool(GetDlgItem(IDC_TREE1), "Tree Tool Tip"); 
    	
  6. Override the PreTranslateMessage in the form view.
    	BOOL CMyFormView::PreTranslateMessage(MSG* pMsg) 
    	{
    		// TODO: Add your specialized code here and/or call the base class
    		if(pMsg->message == WM_MOUSEMOVE && pMsg->hwnd == m_tree.m_hWnd)
    		{
    		CPoint point(LOWORD(pMsg->lParam),HIWORD(pMsg->lParam));
    			HTREEITEM hItem = m_tree.HitTest(point);
    			if(hItem != NULL)
    			{
    				CString text = tooltipMap[hItem];				
    				m_tooltip.UpdateTipText(text,&m_tree);
    				m_tooltip.RelayEvent(pMsg);
    			}
    			
    		}
    	}
    	
    This changes the tool tip text as the mouse pointer moves along the different items in the tree control.



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