public InfiniteCollection()
{
InitializeComponent();
this.WhenAnyValue(x => x.ViewModel)
.Where(x => x != null)
.Select(x => Unit.Default)
.InvokeCommand(this, x => x.ViewModel.InitializeData)
.DisposeWith(PageBindings);
this.WhenAnyValue(x => x.ViewModel.Items)
.Where(x => x != null)
.BindTo(this, x => x.Collection.ItemsSource)
.DisposeWith(PageBindings);
Collection
.Events()
.SelectionChanged
.Subscribe(_ => Collection.SelectedItem = null)
.DisposeWith(PageBindings);
var loadPressed =
Load
.Events()
.Pressed
.Select(x => Unit.Default)
.Do(_ => this.Log().Debug($"{nameof(Load.Pressed)}"));
var itemThresholdReached =
Collection
.Events()
.RemainingItemsThresholdReached
.Select(x => Unit.Default)
.Do(_ => this.Log().Debug($"{nameof(Collection.RemainingItemsThresholdReached)}"));
itemThresholdReached
.Merge(loadPressed)
.Throttle(TimeSpan.FromSeconds(10), RxApp.TaskpoolScheduler)
.Do(_ => this.Log().Debug("Merged Observable"))
.ObserveOn(RxApp.MainThreadScheduler)
.InvokeCommand(this, x => x.ViewModel.Load)
.DisposeWith(PageBindings);
}
public InfiniteScroll()
{
InitializeComponent();
this.OneWayBind(ViewModel, x => x.IsRefreshing, x => x.ListView.IsRefreshing)
.DisposeWith(PageBindings);
this.OneWayBind(ViewModel, x => x.IsLoading, x => x.Activity.IsRunning)
.DisposeWith(PageBindings);
this.OneWayBind(ViewModel, x => x.IsLoading, x => x.Activity.IsVisible)
.DisposeWith(PageBindings);
this.Bind(ViewModel, x => x.SearchText, x => x.Search.Text)
.DisposeWith(PageBindings);
this.WhenAnyValue(x => x.ViewModel.Items)
.Where(x => x != null)
.BindTo(this, x => x.ListView.ItemsSource)
.DisposeWith(PageBindings);
ListView
.Events()
.Refreshing
.Select(x => ((IList <InventoryItemViewModel>)ListView.ItemsSource).Count)
.InvokeCommand(this, x => x.ViewModel.Load)
.DisposeWith(PageBindings);
ListView
.Events()
.ItemSelected
.Subscribe(item => { ListView.SelectedItem = null; })
.DisposeWith(PageBindings);
var itemAppearing =
ListView
.Events()
.ItemAppearing;
itemAppearing
.Throttle(TimeSpan.FromMilliseconds(300), RxApp.TaskpoolScheduler)
.Where(x => (x.Item as InventoryItemViewModel)?.Id == ((IList <InventoryItemViewModel>)ListView.ItemsSource)?.Last()?.Id)
.Select(x => x.ItemIndex)
.ObserveOn(RxApp.MainThreadScheduler)
.InvokeCommand(this, x => x.ViewModel.Load)
.DisposeWith(PageBindings);
Load
.Events()
.Pressed
.Select(x => ((IList)ListView.ItemsSource).Count)
.ObserveOn(RxApp.MainThreadScheduler)
.InvokeCommand(this, x => x.ViewModel.Load)
.DisposeWith(PageBindings);
#region Original
/* This is the original example for Item Appearing and Infinite Scroll
* Taken from https://github.com/RobGibbens/InfiniteScrolling/blob/master/InfiniteScrolling/MainPage.xaml.cs
*/
// this.ListView.ItemAppearing += async (sender, e) =>
// {
// var itemViewModel = (InventoryItemViewModel) e.Item;
//
// this.Log().Debug("stuff about the item");
// if (!ViewModel.IsLoading)
// {
//
// if (itemViewModel.Name == ViewModel.Items.Last().Name)
// {
// await LoadData();
// }
// }
// };
// }
//
// async Task LoadData ()
// {
// await ViewModel.LoadData (_start, _numberOfRecords);
// _start = _start + _numberOfRecords;
// }
#endregion
}