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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;
using System.Windows.Threading;
namespace Tango.Core
{
public class SynchronizedObservableCollection<T> : ObservableCollection<T>
{
private object _sync_lock = new object();
private object _modify_lock = new object();
private SynchronizedObservableCollectionDispatcher _dispatcher;
public SynchronizedObservableCollection() : base()
{
_dispatcher = new SynchronizedObservableCollectionDispatcher();
BindingOperations.EnableCollectionSynchronization(this, _modify_lock);
}
public SynchronizedObservableCollection(IEnumerable<T> collection) : base(collection)
{
_dispatcher = new SynchronizedObservableCollectionDispatcher();
BindingOperations.EnableCollectionSynchronization(this, _modify_lock);
}
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
lock (_modify_lock)
{
_dispatcher.Invoke(() =>
{
base.OnCollectionChanged(e);
});
}
}
protected override void InsertItem(int index, T item)
{
lock (_modify_lock)
{
base.InsertItem(index, item);
}
}
protected override void RemoveItem(int index)
{
lock (_modify_lock)
{
base.RemoveItem(index);
}
}
protected override void ClearItems()
{
lock (_modify_lock)
{
base.ClearItems();
}
}
}
internal class SynchronizedObservableCollectionDispatcher
{
internal Dispatcher Dispatcher { get; set; }
internal SynchronizedObservableCollectionDispatcher()
{
if (Application.Current != null)
{
Dispatcher = Application.Current.Dispatcher;
}
}
internal void Invoke(Action action)
{
if (Dispatcher != null)
{
Dispatcher.Invoke(action);
}
else
{
action();
}
}
}
}
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