Synchronize scrolling of 2 or more listboxes

ecommerce web developer development freelance website designer India

Description:This example shows you how to synchronize two listboxes. When one of the listboxes is scrolled, the other listbox scrolls
as well. It also selects the item in one listbox based on selecting an item in the other listbox.

Private Const LB_GETTOPINDEX = &H18E
Private Const LB_SETTOPINDEX = &H197
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 Sub Form_Load()
For i = 1 To 50
List1.AddItem "Item " & CStr(i)
List2.AddItem "Item " & CStr(i)
Next
End Sub

Private Sub List1_Scroll()
Call SendMessage(List2.hwnd, LB_SETTOPINDEX, SendMessage(List1.hwnd, _
LB_GETTOPINDEX, 0, 0), 0)
End Sub

Private Sub List2_Scroll()
Call SendMessage(List1.hwnd, LB_SETTOPINDEX, SendMessage(List2.hwnd, _
LB_GETTOPINDEX, 0, 0), 0)
End Sub

Private Sub List2_Click()
List1.ListIndex = List2.ListIndex
End Sub

Private Sub List1_Click()
List2.ListIndex = List1.ListIndex
End Sub

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