How do we use ChildrenReordered event?

[Ron]

I need to know when the list has been reordered. I see that there is a ChildrenReordered event, but I can't get it to fire. Would you please provide the code behind C# code to handle when the list has been reordered?

Thanks!

[Ves]

Hi Ron,

ChildrenReordered event is exposed by Xamarin.Forms.VisualElement and it is not applicable in this case. Instead, you can handle the CollectionChanged event of the ItemsSource, provided, that the items source is an observable collection. The CollectionChanged event will be triggered twice -- once with Remove action and second time with Add. Here is a sample:

public lv000()
        {
            InitializeComponent();

            this.listView.ItemsSource = new ObservableCollection<string>(from c in Enumerable.Range(0, 50) select "Item " + c);
            (this.listView.ItemsSource as ObservableCollection<string>).CollectionChanged += Lv000_CollectionChanged;

            this.listView.IsItemsReorderEnabled = true;
        }

        private void Lv000_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Remove)
            {
                var removedItem = e.OldItems[0];
            }
            else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
            {
                var addedItem = e.NewItems[0];
            }

        }

Best regards,
Ves
Telerik by Progress

[Ron]

Awesome! Thank you!