public VirtualListView()
{
InitializeComponent();
ViewModel = new VirtualListVewModel(SynchronizationContext.Current, new DataService());
var listMaxItems = 30;
listBox1.DataSource = ViewModel.Items;
ViewModel.Count
.Sample(TimeSpan.FromMilliseconds(100)) // every tenth of a second
.DistinctUntilChanged() // if count has changed
.Select(x=> Math.Max(0, x- listMaxItems))
.ObserveOn(SynchronizationContext.Current)
.Subscribe(x => {
vScrollBar1.Maximum = x; // update the scrollbar
// vScrollBar1.Value = vScrollBar1.Maximum; // auto-scroll the list
});
Observable.FromEventPattern<EventHandler, EventArgs>(h => vScrollBar1.ValueChanged += h,
h => vScrollBar1.ValueChanged -= h)
.Select(_ => vScrollBar1.Value)
.StartWith(0)
.Subscribe(x => ViewModel.Virtualise(x, listMaxItems));
}
public VirtualListView()
{
InitializeComponent();
ViewModel = new VirtualListVewModel(SynchronizationContext.Current, new DataService());
var listMaxItems = 30;
listBox1.DataSource = ViewModel.Items;
ViewModel.Count
.Sample(TimeSpan.FromMilliseconds(100)) // every tenth of a second
.DistinctUntilChanged() // if count has changed
.Select(x => Math.Max(0, x - listMaxItems))
.ObserveOn(SynchronizationContext.Current)
.Subscribe(x => {
vScrollBar1.Maximum = x; // update the scrollbar
// vScrollBar1.Value = vScrollBar1.Maximum; // auto-scroll the list
});
Observable.FromEventPattern <EventHandler, EventArgs>(h => vScrollBar1.ValueChanged += h,
h => vScrollBar1.ValueChanged -= h)
.Select(_ => vScrollBar1.Value)
.StartWith(0)
.Subscribe(x => ViewModel.Virtualise(x, listMaxItems));
}
