1  using System;
 2  using System.Threading;
 3  
 4  namespace Ryujinx.Common
 5  {
 6      public class ReactiveObject<T>
 7      {
 8          private readonly ReaderWriterLockSlim _readerWriterLock = new();
 9          private bool _isInitialized;
10          private T _value;
11  
12          public event EventHandler<ReactiveEventArgs<T>> Event;
13  
14          public T Value
15          {
16              get
17              {
18                  _readerWriterLock.EnterReadLock();
19                  T value = _value;
20                  _readerWriterLock.ExitReadLock();
21  
22                  return value;
23              }
24              set
25              {
26                  _readerWriterLock.EnterWriteLock();
27  
28                  T oldValue = _value;
29  
30                  bool oldIsInitialized = _isInitialized;
31  
32                  _isInitialized = true;
33                  _value = value;
34  
35                  _readerWriterLock.ExitWriteLock();
36  
37                  if (!oldIsInitialized || oldValue == null || !oldValue.Equals(_value))
38                  {
39                      Event?.Invoke(this, new ReactiveEventArgs<T>(oldValue, value));
40                  }
41              }
42          }
43  
44          public static implicit operator T(ReactiveObject<T> obj)
45          {
46              return obj.Value;
47          }
48      }
49  
50      public class ReactiveEventArgs<T>
51      {
52          public T OldValue { get; }
53          public T NewValue { get; }
54  
55          public ReactiveEventArgs(T oldValue, T newValue)
56          {
57              OldValue = oldValue;
58              NewValue = newValue;
59          }
60      }
61  }