public static Task UpdateItems(this ObservableCollection <Notification> collection, IEnumerable <Notification> items)
{
var tcs = new TaskCompletionSource <bool>();
Device.BeginInvokeOnMainThread(() =>
{
IModelIDEqualityComparer ec = new IModelIDEqualityComparer();
var removedItems = collection.Except(items, ec).ToList();
foreach (var removedItem in removedItems)
{
collection.Remove(removedItem as Notification);
}
var addedItems = items.Except(collection, ec);
foreach (var addedItem in addedItems)
{
collection.Add(addedItem as Notification);
}
tcs.SetResult(true);
});
return(tcs.Task);
}
public static Task <List <LibraryItem> > UpdateItems(this ObservableCollection <LibraryItem> collection, IEnumerable <LibraryItem> items)
{
var tcs = new TaskCompletionSource <List <LibraryItem> >();
Device.BeginInvokeOnMainThread(() =>
{
IModelIDEqualityComparer ec = new IModelIDEqualityComparer();
List <LibraryItem> result = new List <LibraryItem>();
var removedItems = collection.Except(items, ec).ToList();
foreach (var removedItem in removedItems)
{
collection.Remove(removedItem as LibraryItem);
}
var addedItems = items.Except(collection, ec);
foreach (var addedItem in addedItems)
{
collection.Add(addedItem as LibraryItem);
result.Add(addedItem as LibraryItem);
}
tcs.SetResult(result);
});
return(tcs.Task);
}
public static Task <List <RecordQueueItem> > UpdateItems(this ObservableCollection <RecordQueueItem> collection, IEnumerable <RecordQueueItem> items)
{
var tcs = new TaskCompletionSource <List <RecordQueueItem> >();
Device.BeginInvokeOnMainThread(() =>
{
IModelIDEqualityComparer ec = new IModelIDEqualityComparer();
List <RecordQueueItem> result = new List <RecordQueueItem>();
var removedItems = collection.Except(items, ec).ToList();
foreach (var removedItem in removedItems)
{
collection.Remove(removedItem as RecordQueueItem);
}
var addedItems = items.Except(collection, ec);
foreach (var addedItem in addedItems)
{
collection.Add(addedItem as RecordQueueItem);
result.Add(addedItem as RecordQueueItem);
}
foreach (var item in collection)
{
var serverItem = items.FirstOrDefault(i => i.ID == item.ID);
if (serverItem != null)
{
item.Rank = serverItem.Rank;
}
}
collection.SortByRank();
tcs.SetResult(result);
});
return(tcs.Task);
}