The following solution works even with a delay of 1 ms. To be sure it works probably you can choose a higher delay, 10 ms for example, but a delay of 100 ms will make it a bit laggy on selecting "nothing". Here's the C#-Code:
public class FixedListView : ListView
{
private Timer _ItemSelectionChangedTimer = new Timer();
private Timer _SelectedIndexChangedTimer = new Timer();
private ListViewItemSelectionChangedEventArgs _ItemSelectionChangedEventArgs;
private EventArgs _SelectedIndexChangedEventArgs;
public FixedListView()
{
this._ItemSelectionChangedTimer.Interval = 1;
this._SelectedIndexChangedTimer.Interval = 1;
this._ItemSelectionChangedTimer.Tick += (sender, e) =>
{
this.OnItemSelectionChanged(this._ItemSelectionChangedEventArgs);
this._ItemSelectionChangedEventArgs = null;
};
this._SelectedIndexChangedTimer.Tick += (sender, e) =>
{
this.OnSelectedIndexChanged(this._SelectedIndexChangedEventArgs);
this._SelectedIndexChangedEventArgs = null;
};
}
protected override void OnItemSelectionChanged(ListViewItemSelectionChangedEventArgs e)
{
if (this._ItemSelectionChangedTimer.Enabled)
{
this._ItemSelectionChangedTimer.Stop();
base.OnItemSelectionChanged(e);
}
else
{
this._ItemSelectionChangedEventArgs = e;
this._ItemSelectionChangedTimer.Start();
}
}
protected override void OnSelectedIndexChanged(EventArgs e)
{
if (this._SelectedIndexChangedTimer.Enabled)
{
this._SelectedIndexChangedTimer.Stop();
base.OnSelectedIndexChanged(e);
}
else
{
this._SelectedIndexChangedEventArgs = e;
this._SelectedIndexChangedTimer.Start();
}
}
}
And here is the VB-Code:
Public Class FixedListBox
Inherits ListView
Public Sub New()
Me._ItemSelectionChangedTimer.Interval = 1
Me._SelectedIndexChangedTimer.Interval = 1
AddHandler Me._ItemSelectionChangedTimer.Tick, _
Sub(sender, e)
Me.OnItemSelectionChanged(Me._ItemSelectionChangedEventArgs)
Me._ItemSelectionChangedEventArgs = Nothing
End Sub
AddHandler Me._SelectedIndexChangedTimer.Tick, _
Sub(sender, e)
Me.OnSelectedIndexChanged(Me._SelectedIndexChangedEventArgs)
Me._SelectedIndexChangedEventArgs = Nothing
End Sub
End Sub
Private _ItemSelectionChangedTimer As New Timer()
Private _SelectedIndexChangedTimer As New Timer()
Private _ItemSelectionChangedEventArgs As ListViewItemSelectionChangedEventArgs
Private _SelectedIndexChangedEventArgs As EventArgs
Protected Overrides Sub OnItemSelectionChanged(e As ListViewItemSelectionChangedEventArgs)
If Me._ItemSelectionChangedTimer.Enabled Then
Me._ItemSelectionChangedTimer.Stop()
MyBase.OnItemSelectionChanged(e)
Else
Me._ItemSelectionChangedEventArgs = e
Me._ItemSelectionChangedTimer.Start()
End If
End Sub
Protected Overrides Sub OnSelectedIndexChanged(e As EventArgs)
If Me._SelectedIndexChangedTimer.Enabled Then
Me._SelectedIndexChangedTimer.Stop()
MyBase.OnSelectedIndexChanged(e)
Else
Me._SelectedIndexChangedEventArgs = e
Me._SelectedIndexChangedTimer.Start()
End If
End Sub
End Class
You can use the control like a normal ListView but SelectedIndexChanged and ItemSelectionChanged will fire only once.
Have fun...
