public ExpandableGroupsListViewModel()
{
MessagingCenter.Subscribe <GroupViewModel>(this, "UpdateSelectedItemsCountMessage", (e) => { UpdateSelectedItemsCount(); });
Task.Run(async() =>
{
IsBusy = true;
var livingItemsDataServicce = new LifeDataService();
var livingItems = (await livingItemsDataServicce.GetItemsAsync()).ToList();
var groups = livingItems.GroupBy(x => x.Category).Select(x => new ObservableGroupCollection <string, LifeOnPlanetModel>(x)).ToList();
IsBusy = false;
//This is required to invoke on main thread otherwise it will throw the exception
Device.BeginInvokeOnMainThread(() =>
{
foreach (var group in groups)
{
GroupedItems.Add(
new GroupViewModel
(
groupTitle: group.Key,
groupChildItems: group.Select(i => new GroupItemModel(i.Id, i.Name, i.IsSelected)).ToList()
));
}
//Show selected items count initialy when page loads
UpdateSelectedItemsCount();
});
});
}
public BasicGroupingViewModel()
{
Task.Run(async() =>
{
IsBusy = true;
var livingItemsDataServicce = new LifeDataService();
var livingItems = (await livingItemsDataServicce.GetItemsAsync()).ToList();
GroupedItems = livingItems.GroupBy(x => x.Category).Select(x => new ObservableGroupCollection <string, LifeOnPlanetModel>(x)).ToList();
IsBusy = false;
});
}