Answers

• jezh Member, Xamarin Team Xamurai

  June 2020 edited June 2020

  I think you can try to use ListView.ScrollTo to achieve this.

  We can scroll to the last one item.
  For example:

  lstView.ScrollTo(veggies[veggies.Count-1], ScrollToPosition.MakeVisible ,true);
  

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• nonubitta Member ✭✭

  June 2020

  But ScrollTo will only scroll to a specified position once. I want continuous scrolling slowly.

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• jezh Member, Xamarin Team Xamurai

  June 2020

  You can refer to this article: Infinite Scrolling ListView For Xamarin.Forms App Using Behaviors
  which uses Behaviors to achieve this function.

  The main code is

  public class InfiniteScroll: Behavior < ListView > {    
          public static readonly BindableProperty LoadMoreCommandProperty = BindableProperty.Create("LoadMoreCommand", typeof(ICommand), typeof(InfiniteScroll), null);    
          public ICommand LoadMoreCommand {    
              get {    
                  return (ICommand) GetValue(LoadMoreCommandProperty);    
              }    
              set {    
                  SetValue(LoadMoreCommandProperty, value);    
              }    
          }    
          public ListView AssociatedObject {    
              get;    
              private set;    
          }    
          protected override void OnAttachedTo(ListView bindable) {    
              base.OnAttachedTo(bindable);    
              AssociatedObject = bindable;    
              bindable.BindingContextChanged += Bindable_BindingContextChanged;    
              bindable.ItemAppearing += InfiniteListView_ItemAppearing;    
          }    
          private void Bindable_BindingContextChanged(object sender, EventArgs e) {    
              OnBindingContextChanged();    
          }    
          protected override void OnBindingContextChanged() {    
              base.OnBindingContextChanged();    
              BindingContext = AssociatedObject.BindingContext;    
          }    
          protected override void OnDetachingFrom(ListView bindable) {    
              base.OnDetachingFrom(bindable);    
              bindable.BindingContextChanged -= Bindable_BindingContextChanged;    
              bindable.ItemAppearing -= InfiniteListView_ItemAppearing;    
          }    
          void InfiniteListView_ItemAppearing(object sender, ItemVisibilityEventArgs e) {    
              var items = AssociatedObject.ItemsSource as IList;    
              if (items != null && e.Item == items[items.Count - 1]) {    
                  if (LoadMoreCommand != null && LoadMoreCommand.CanExecute(null)) LoadMoreCommand.Execute(null);    
              }    
          }    
      }    
  

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• nonubitta Member ✭✭

  June 2020 edited June 2020

  I am not looking for infinite scroll. I am looking for automatic scroll where listview keeps on scrolling one item at a time by itself. Not requiring user to interact.

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• LardeCristo Member ✭✭

  June 2020 edited June 2020

  Hi, use 'looping'

  pseudo-code

  a=0
  looping a < 60 or "ListView.length"
  {
  scrollto....
  Task.Delay(3);
  a++;
  }

  0