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    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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