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| public class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, INotifyCollectionChanged, INotifyPropertyChanged
{
private const string CountString = "Count";
private const string IndexerName = "Item[]";
private const string KeysName = "Keys";
private const string ValuesName = "Values";
private IDictionary<TKey, TValue> _Dictionary;
protected IDictionary<TKey, TValue> Dictionary
{
get { return _Dictionary; }
}
#region Constructors
public ObservableDictionary()
{
_Dictionary = new Dictionary<TKey, TValue>();
}
public ObservableDictionary(IDictionary<TKey, TValue> dictionary)
{
_Dictionary = new Dictionary<TKey, TValue>(dictionary);
}
public ObservableDictionary(IEqualityComparer<TKey> comparer)
{
_Dictionary = new Dictionary<TKey, TValue>(comparer);
}
public ObservableDictionary(int capacity)
{
_Dictionary = new Dictionary<TKey, TValue>(capacity);
}
public ObservableDictionary(IDictionary<TKey, TValue> dictionary, IEqualityComparer<TKey> comparer)
{
_Dictionary = new Dictionary<TKey, TValue>(dictionary, comparer);
}
public ObservableDictionary(int capacity, IEqualityComparer<TKey> comparer)
{
_Dictionary = new Dictionary<TKey, TValue>(capacity, comparer);
}
#endregion
public IObservable<NotifyCollectionChangedEventArgs> GetObservableChanges()
{
return Observable.FromEvent<NotifyCollectionChangedEventHandler, NotifyCollectionChangedEventArgs>(
h =>
{
NotifyCollectionChangedEventHandler handler = new NotifyCollectionChangedEventHandler(
(sender, e) =>
{
h(e);
});
return handler;
},
h => CollectionChanged += h,
h => CollectionChanged -= h
);
}
public IObservable<List<TValue>> GetObservableAddedValues()
{
return GetObservableChanges()
.Where(evt =>
{
if (evt.Action == NotifyCollectionChangedAction.Add)
return true;
if (evt.Action == NotifyCollectionChangedAction.Replace)
return true;
return false;
})
.Select(evt =>
{
return evt.NewItems.Cast<KeyValuePair<TKey, TValue>>().Select(x => x.Value).ToList();
});
}
public IObservable<List<TValue>> GetObservableRemovedValues()
{
return GetObservableChanges()
.Where(evt =>
{
if (evt.Action == NotifyCollectionChangedAction.Remove)
return true;
if (evt.Action == NotifyCollectionChangedAction.Replace)
return true;
return false;
})
.Select(evt =>
{
return evt.OldItems.Cast<KeyValuePair<TKey, TValue>>().Select(x => x.Value).ToList();
});
}
#region IDictionary<TKey,TValue> Members
public void Add(TKey key, TValue value)
{
Insert(key, value, true);
}
public bool ContainsKey(TKey key)
{
return Dictionary.ContainsKey(key);
}
public ICollection<TKey> Keys
{
get { return Dictionary.Keys; }
}
public bool Remove(TKey key)
{
if (key == null) throw new ArgumentNullException("key");
TValue value;
Dictionary.TryGetValue(key, out value);
var removed = Dictionary.Remove(key);
if (removed)
OnCollectionChanged(NotifyCollectionChangedAction.Remove, new KeyValuePair<TKey, TValue>(key, value));
return removed;
}
public bool TryGetValue(TKey key, out TValue value)
{
return Dictionary.TryGetValue(key, out value);
}
public ICollection<TValue> Values
{
get { return Dictionary.Values; }
}
public TValue this[TKey key]
{
get
{
return Dictionary[key];
}
set
{
Insert(key, value, false);
}
}
#endregion
#region ICollection<KeyValuePair<TKey,TValue>> Members
public void Add(KeyValuePair<TKey, TValue> item)
{
Insert(item.Key, item.Value, true);
}
public void Clear()
{
if (Dictionary.Count > 0)
{
Dictionary.Clear();
OnCollectionChanged();
}
}
public bool Contains(KeyValuePair<TKey, TValue> item)
{
return Dictionary.Contains(item);
}
public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
{
Dictionary.CopyTo(array, arrayIndex);
}
public int Count
{
get { return Dictionary.Count; }
}
public bool IsReadOnly
{
get { return Dictionary.IsReadOnly; }
}
public bool Remove(KeyValuePair<TKey, TValue> item)
{
return Remove(item.Key);
}
#endregion
#region IEnumerable<KeyValuePair<TKey,TValue>> Members
public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
{
return Dictionary.GetEnumerator();
}
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
return ((IEnumerable)Dictionary).GetEnumerator();
}
#endregion
#region INotifyCollectionChanged Members
public event NotifyCollectionChangedEventHandler CollectionChanged;
#endregion
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
public void AddRange(IDictionary<TKey, TValue> items)
{
if (items == null) throw new ArgumentNullException("items");
if (items.Count > 0)
{
if (Dictionary.Count > 0)
{
if (items.Keys.Any((k) => Dictionary.ContainsKey(k)))
throw new ArgumentException("An item with the same key has already been added.");
else
foreach (var item in items) Dictionary.Add(item);
}
else
_Dictionary = new Dictionary<TKey, TValue>(items);
OnCollectionChanged(NotifyCollectionChangedAction.Add, items.ToArray());
}
}
private void Insert(TKey key, TValue value, bool add)
{
if (key == null) throw new ArgumentNullException("key");
TValue item;
if (Dictionary.TryGetValue(key, out item))
{
if (add) throw new ArgumentException("An item with the same key has already been added.");
if (Equals(item, value)) return;
Dictionary[key] = value;
OnCollectionChanged(NotifyCollectionChangedAction.Replace, new KeyValuePair<TKey, TValue>(key, value), new KeyValuePair<TKey, TValue>(key, item));
}
else
{
Dictionary[key] = value;
OnCollectionChanged(NotifyCollectionChangedAction.Add, new KeyValuePair<TKey, TValue>(key, value));
}
}
private void OnPropertyChanged()
{
OnPropertyChanged(CountString);
OnPropertyChanged(IndexerName);
OnPropertyChanged(KeysName);
OnPropertyChanged(ValuesName);
}
protected virtual void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
private void OnCollectionChanged()
{
OnPropertyChanged();
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
private void OnCollectionChanged(NotifyCollectionChangedAction action, KeyValuePair<TKey, TValue> changedItem)
{
OnPropertyChanged();
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, changedItem));
}
private void OnCollectionChanged(NotifyCollectionChangedAction action, KeyValuePair<TKey, TValue> newItem, KeyValuePair<TKey, TValue> oldItem)
{
OnPropertyChanged();
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, newItem, oldItem));
}
private void OnCollectionChanged(NotifyCollectionChangedAction action, IList newItems)
{
OnPropertyChanged();
if (CollectionChanged != null) CollectionChanged(this, new NotifyCollectionChangedEventArgs(action, newItems));
}
}
|