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Listbox selection with Right Click (using LB_ITEMFROMPOINT)

Visual Basic 6, or VB Classic

Allows selection of listbox items with right-click. *Not trying to get any votes, just sharing help I've provided in VB Discussion forum to everyone. Enjoy.*

Original Author: Jason Sawdey


Just add a listbox with the default name of List1 to the form, and paste the code into the form.

API Declarations

Private Declare Function SendMessage Lib "user32" Alias _
"SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
Private Const LB_ITEMFROMPOINT = &H1A9


Private Sub Form_Load()
  Dim i As Integer
  'Fill the listbox
  For i = 1 To 5
    List1.AddItem "Item " & i
End Sub
Private Sub List1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  Dim lRet As Long
  Dim lXPos As Long, lYPos As Long
  'Convert the cursor position into pixels, because that is what is needed
  lXPos = CLng(X / Screen.TwipsPerPixelX)
  lYPos = CLng(Y / Screen.TwipsPerPixelY)
  'If the right mouse button is clicked...
  If Button = 2 Then
    'Get the listitem closest to the cursor
    'NOTE: Since the X and Y values have to be in the form of high and low
    'order words, send the values as ((lYPos * 65536) + lXPos)
    lRet = SendMessage(List1.hWnd, LB_ITEMFROMPOINT, 0, ByVal _
      ((lYPos * 65536) + lXPos))
    'If the returned value is a valid index, then set that item as the selected
    If lRet < List1.ListCount Then
      List1.ListIndex = lRet
    End If
  End If
End Sub

About this post

Posted: 2002-06-01
By: ArchiveBot
Viewed: 97 times


Visual Basic 6


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