[RESOLVED] [2005] ListBox RightClick Selects

[Darkstorm]

Hey there

I'm using this code to select an item in a ListBox when a user right clicks on it

Private Sub listOnline_MouseDown(ByVal sender As System.Object, _
ByVal e As System.Windows.Forms.MouseEventArgs) Handles listOnline.MouseDown
            If e.Button = Windows.Forms.MouseButtons.Right Then
                Dim mouseY As Integer = listOnline.PointToClient(Windows.Forms.Cursor.Position).Y
                Dim itemIndex As Integer = (mouseY \ listOnline.ItemHeight) - listOnline.TopIndex
                listOnline.SelectedIndex = itemIndex
 
                listOnline.ContextMenuStrip = blockMenu
                Dim myString As String = listOnline.SelectedItem
                Dim mySplit(2) As String
                mySplit = Split(myString, " - ")
                If InStr(mySplit(0), "¤") Then
                    Block.Text = "Unblock: " & mySplit(2)
                Else
                    Block.Text = "Block: " & mySplit(2)
                End If
            End If
    End Sub

It works great....but....my list is bigger than the container so a scrollbar appears, I can only rightclick select things that appear in the ListBox when the scrollbar is all the way up, if I scroll down and try to rightclick select something it wont work. It basically selects the "wrong" item....the item that would be in that place if the scrollbar was all the way up....

It probably has something to do with this:

Dim itemIndex As Integer = (mouseY \ listOnline.ItemHeight) - listOnline.TopIndex

.....what could I use instead to make it work?

[crptcblade]

Use this...

ListBox1.IndexFromPoint(New Point(e.X, e.Y))

in your MouseDown handler to get the correct item that you are over.

[jmcilhinney]

You should use the IndexFromPoint method to determine the index of the item at the point that was clicked. That will work regardless of whether or how far the control is scrolled. Here's a quote from the help topic:

You can use this method to determine which item within the list is selected when a user right-clicks over the ListBox.

[jmcilhinney]

I need to consume more caffeine it would appear.