Development ≫ vb.NET | 2010-01-01 16:41:25

Listview onSelectedIndexChanged Event

The ৺.net ListView offers a ৺onSelectedIndexChanged-Event. But if you are selecting another value, the event is fired twice.

Heres a solution for this problem: Create your own ListView-Class, that handles the event vie the appliaction.idle event

The new ListView Class

 
Public Class myListView
    Inherits ListView
    Private SelectionDoneHandlerSet As Boolean = False
 
    Public Event selectionChangeFinished()
 
    Protected Overrides Sub OnSelectedIndexChanged(ByVal e As System.EventArgs)
        MyBase.OnSelectedIndexChanged(e)
        If Not SelectionDoneHandlerSet Then
            SelectionDoneHandlerSet = True
            AddHandler Application.Idle, New EventHandler(AddressOf Me.ListViewChangeFinished)
        End If
    End Sub
 
    Private Sub ListViewChangeFinished(ByVal sender As System.Object, ByVal e As System.EventArgs)
        SelectionDoneHandlerSet = False
        RaiseEvent selectionChangeFinished()
        RemoveHandler Application.Idle, New EventHandler(AddressOf Me.ListViewChangeFinished)
    End Sub
End Class
 

The new event
this event is only fired once per selection:

 
Private Sub MyListView1_SelectedIndexChanged() Handles MyListView1.selectionChangeFinished
    If MyListView1.SelectedItems.Count > 0 Then
        Me.TextBox1.Enabled = True
        Me.TextBox1.Text = MyListView1.SelectedItems(0).Text
    Else
        Me.TextBox1.Enabled = False
    End If
end sub
 