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using System;
using System.Collections.Generic;
using System.Linq;
using Windows.Foundation.Collections;
namespace File360.Common
{
/// <summary>
/// Implementation of IObservableMap that supports reentrancy for use as a default view
/// model.
/// </summary>
public class ObservableDictionary : IObservableMap<string, object>
{
private class ObservableDictionaryChangedEventArgs : IMapChangedEventArgs<string>
{
public ObservableDictionaryChangedEventArgs(CollectionChange change, string key)
{
this.CollectionChange = change;
this.Key = key;
}
public CollectionChange CollectionChange { get; private set; }
public string Key { get; private set; }
}
private Dictionary<string, object> _dictionary = new Dictionary<string, object>();
public event MapChangedEventHandler<string, object> MapChanged;
private void InvokeMapChanged(CollectionChange change, string key)
{
var eventHandler = MapChanged;
if (eventHandler != null)
{
eventHandler(this, new ObservableDictionaryChangedEventArgs(change, key));
}
}
public void Add(string key, object value)
{
this._dictionary.Add(key, value);
this.InvokeMapChanged(CollectionChange.ItemInserted, key);
}
public void Add(KeyValuePair<string, object> item)
{
this.Add(item.Key, item.Value);
}
public bool Remove(string key)
{
if (this._dictionary.Remove(key))
{
this.InvokeMapChanged(CollectionChange.ItemRemoved, key);
return true;
}
return false;
}
public bool Remove(KeyValuePair<string, object> item)
{
object currentValue;
if (this._dictionary.TryGetValue(item.Key, out currentValue) &&
Object.Equals(item.Value, currentValue) && this._dictionary.Remove(item.Key))
{
this.InvokeMapChanged(CollectionChange.ItemRemoved, item.Key);
return true;
}
return false;
}
public object this[string key]
{
get
{
return this._dictionary[key];
}
set
{
this._dictionary[key] = value;
this.InvokeMapChanged(CollectionChange.ItemChanged, key);
}
}
public void Clear()
{
var priorKeys = this._dictionary.Keys.ToArray();
this._dictionary.Clear();
foreach (var key in priorKeys)
{
this.InvokeMapChanged(CollectionChange.ItemRemoved, key);
}
}
public ICollection<string> Keys
{
get { return this._dictionary.Keys; }
}
public bool ContainsKey(string key)
{
return this._dictionary.ContainsKey(key);
}
public bool TryGetValue(string key, out object value)
{
return this._dictionary.TryGetValue(key, out value);
}
public ICollection<object> Values
{
get { return this._dictionary.Values; }
}
public bool Contains(KeyValuePair<string, object> item)
{
return this._dictionary.Contains(item);
}
public int Count
{
get { return this._dictionary.Count; }
}
public bool IsReadOnly
{
get { return false; }
}
public IEnumerator<KeyValuePair<string, object>> GetEnumerator()
{
return this._dictionary.GetEnumerator();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this._dictionary.GetEnumerator();
}
public void CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
{
int arraySize = array.Length;
foreach (var pair in this._dictionary)
{
if (arrayIndex >= arraySize) break;
array[arrayIndex++] = pair;
}
}
}
}