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.



Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

  • Temporary network outages -- even those lasting just a few minutes -- can cripple organizations that rely on local Internet access at remote locations. Failover systems that automatically switch to 4G LTE cellular when landlines go down let organizations maximize uptime, even when the unexpected happens. Read this white paper to learn how 4G failover systems that use standalone gateways supported by a cloud-based management tool are proving to be a solid choice for improved business continuity and productivity …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date