void OnItemSelected(object sender, SelectedItemChangedEventArgs args)
{
if (!_isDisappeared && !_isAppearing && args.SelectedItem != null)
{
ItemsListView.ScrollTo(args.SelectedItem, ScrollToPosition.MakeVisible, true);
}
}
protected override void OnAppearing()
{
base.OnAppearing();
viewModel.LoadLatestCommand.Execute(null);
if (viewModel.LogItems.Count > 0)
{
ItemsListView.ScrollTo(viewModel.LogItems[0], ScrollToPosition.Start, true);
}
}
private void LoadMore_OnClicked(object sender, EventArgs e)
{
// VisibilyatorAsync(true,1);
MoreItemIndicator.IsVisible = true; MoreItemIndicator.IsRunning = true;
var v = ItemsListView.ItemsSource.Cast <Post>().LastOrDefault();
ItemsListView.ScrollTo(v, ScrollToPosition.MakeVisible, true);
// throw new NotImplementedException();
}
private void StatePicker_SelectedIndexChanged(object sender, EventArgs e)
{
var picker = sender as Picker;
if (!(picker.SelectedItem is StateModel state))
{
return;
}
var items = ItemsListView.ItemsSource as ObservableCollection <ItemModel>;
if (items != null && items.Count > 0)
{
ItemsListView.ScrollTo(items[0], ScrollToPosition.Start, false);
}
ViewModel.ShowItemsCommand.Execute(null);
}
void Handle_ItemAppearing(object sender, ItemVisibilityEventArgs e)
{
//only scroll when the item is more than 1 in the list
if (viewModel.ScrollToEvent && viewModel.Items.Count > 0)
{
viewModel.ScrollToEvent = false;
//get the index of the event that is later than today
int todaysEvent = viewModel.Items.IndexOf(viewModel.Items
.FirstOrDefault(i => DateTime.Compare(DateTime.ParseExact(i.StartDateTime, "yyyy/MM/dd", null), DateTime.Now) > 0));
//if the index is found, scroll to that item in the list
if (todaysEvent != -1)
{
ItemsListView.ScrollTo(viewModel.Items[todaysEvent], ScrollToPosition.Center, true);
Debug.WriteLine("[ScrollToEvent]Moving to the current event " + viewModel.Items[todaysEvent].EventName + "-" + viewModel.Items[todaysEvent].StartDateTime);
}
}
}
protected override async void OnAppearing()
{
_isAppearing = true;
var task = !_viewModel.Items.Any()
? _viewModel.LoadLosungItemsAsync()
: Task.CompletedTask;
base.OnAppearing();
try
{
await task;
ItemsListView.ScrollTo(_viewModel.SelectedItem ?? _viewModel.Today, ScrollToPosition.MakeVisible, false);
}
finally
{
_isAppearing = _isDisappeared = false;
}
}
private void Picker_SelectedIndexChanged(object sender, EventArgs e)
{
ItemsListView.ScrollTo(0);
}
