VB - Set tooltips when setting mouse over an item in a listbox (without clicking)

From this thread. I just found it useful. Feel free to suggest a better title! :

VB Code:

Private Type POINTAPI
    x As Long
    y As Long
End Type
 
Private Type RECT
        Left As Long
        Top As Long
        Right As Long
        Bottom As Long
End Type
 
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function ScreenToClient Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
Private Declare Function ClientToScreen Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
 
Private Const LB_GETITEMRECT = &H198
Private Const LB_ITEMFROMPOINT = &H1A9
 
 
Public Function ItemFromPoint(ByRef oList As ListBox, ByVal x As Single, ByVal y As Single) As Long
    Dim tPOINT As POINTAPI
    Dim iIndex As Long
    'Get the Mouse Cursor Position
    Call GetCursorPos(tPOINT)
    'Convert the Coords to be Relative to the Listbox
    Call ScreenToClient(oList.hwnd, tPOINT)
    'Find which Item the Mouse is Over
    iIndex = SendMessage(oList.hwnd, LB_ITEMFROMPOINT, 0&, ByVal ((tPOINT.x And &HFF) Or (&H10000 * (tPOINT.y And &HFF))))
    'Extract the List Index
    ItemFromPoint = iIndex And &HFF
End Function
 
Private Sub Form_Load()
    Dim iIndex As Integer
       
    For iIndex = 1 To 100
        List1.AddItem iIndex & " blankdata " & iIndex
    Next
End Sub
 
Private Sub List1_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
    Dim iIndex As Long
    Static iLastIndex As Long
    
    iIndex = ItemFromPoint(List1, x, y)
    Me.List1.ToolTipText = Me.List1.List(iIndex)
End Sub