ListBoxTooltip

Private Type POINTAPI
X As Long
Y 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 SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long
Private Const LB_ITEMFROMPOINT = &H1A9
'_________________________________________________________


Private Sub Form_Load()
Dim iIndex As Integer
'Fill the List with Dummy Values

For iIndex = 1 To 100
List1.AddItem "Really Long List Item " & iIndex
Next
End Sub
'_________________________________________________________


Private Sub List1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
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(List1.hWnd, tPOINT)
'Find which Item the Mouse is Over

iIndex = SendMessage(List1.hWnd, LB_ITEMFROMPOINT, 0&, ByVal ((tPOINT.X And &HFF) Or (&H10000 * (tPOINT.Y And &HFF))))
If iIndex >= 0 Then
'Extract the List Index

iIndex = iIndex And &HFF
'set the Lists ToolTipText

List1.ToolTipText = List1.List(iIndex)
End If
End Sub