blob: 37c3ef75812a354f479a65821744507e2e5207da (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
namespace Firebase.Database
{
using System;
using System.Collections.ObjectModel;
using Firebase.Database.Streaming;
/// <summary>
/// Extensions for <see cref="IObservable{T}"/>.
/// </summary>
public static class ObservableExtensions
{
/// <summary>
/// Starts observing on given firebase observable and propagates event into an <see cref="ObservableCollection{T}"/>.
/// </summary>
/// <param name="observable"> The observable. </param>
/// <typeparam name="T"> Type of entity. </typeparam>
/// <returns> The <see cref="ObservableCollection{T}"/>. </returns>
public static ObservableCollection<T> AsObservableCollection<T>(this IObservable<FirebaseEvent<T>> observable)
{
var collection = new ObservableCollection<T>();
observable.Subscribe(f =>
{
if (f.EventType == FirebaseEventType.InsertOrUpdate)
{
var i = collection.IndexOf(f.Object);
if (i >= 0)
{
collection.RemoveAt(i);
}
collection.Add(f.Object);
}
else
{
collection.Remove(f.Object);
}
});
return collection;
}
}
}
|
