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  • Your email address will not be published.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

  • Live Event Date: August 20, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT When you look at natural user interfaces as a developer, it isn't just fun and games. There are some very serious, real-world usage models of how things can help make the world a better place – things like Intel® RealSense™ technology. Check out this upcoming eSeminar and join the panel of experts, both from inside and outside of Intel, as they discuss how natural user interfaces will likely be getting adopted in a wide variety …

  • With 81% of employees using their phones at work, companies have stopped asking: "Is corporate data leaking from personal devices?" and started asking: "How do we effectively prevent corporate data from leaking from personal devices?" The answer has not been simple. ZixOne raises the bar on BYOD security by not allowing email data to reside on the device. In addition, Zix allows employees to maintain complete control of their personal device, therefore satisfying privacy demands of valued employees and the …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds