/// <summary>
/// Initializes a new instance of the <see cref="ElementActioner<TElement>"/> class.
/// </summary>
/// <param name="dispatcher">The dispatcher.</param>
/// <param name="collection">The collection.</param>
/// <param name="addAction">The add action.</param>
/// <param name="removeAction">The remove action.</param>
public ElementActioner(IBindableCollection <TElement> collection, Action <TElement> addAction, Action <TElement> removeAction, IDispatcher dispatcher)
: base(dispatcher)
{
_addAction = addAction;
_removeAction = removeAction;
_collection = collection;
_copy = new BindableCollection <TElement>(dispatcher);
_collection_CollectionChangedHandler = Weak.Event <NotifyCollectionChangedEventArgs>(Collection_CollectionChanged);
_collection.CollectionChanged += _collection_CollectionChangedHandler.HandlerProxy.Handler;
var internalBindableCollection = collection as IBindableCollection <TElement>;
if (internalBindableCollection != null && !internalBindableCollection.HasEvaluated)
{
internalBindableCollection.Evaluating += (sender, e) =>
{
foreach (var element in e.ItemsYieldedFromEvaluation)
{
HandleElement(NotifyCollectionChangedAction.Add, element);
_copy.Add(element);
}
};
}
else
{
_collection.ForEach(element =>
{
HandleElement(NotifyCollectionChangedAction.Add, element);
_copy.Add(element);
});
}
}
public ElementActioner(IBindableCollection <TElement> collection, Action <TElement> addAction, Action <TElement> removeAction, IDispatcher dispatcher)
: base(dispatcher)
{
_addAction = addAction;
_removeAction = removeAction;
_collection = collection;
_copy = new BindableCollection <TElement>(dispatcher);
_collection_CollectionChangedHandler = Weak.Event <NotifyCollectionChangedEventArgs>(Collection_CollectionChanged);
_collection.CollectionChanged += _collection_CollectionChangedHandler.HandlerProxy.Handler;
if (!(collection?.HasEvaluated ?? true))
{
collection.Evaluating += delegate(object sender, EvaluatingEventArgs <TElement> e)
{
foreach (var item in e.ItemsYieldedFromEvaluation)
{
HandleElement(NotifyCollectionChangedAction.Add, item);
_copy.Add(item);
}
};
}
else
{
_collection.ForEach(delegate(TElement element)
{
HandleElement(NotifyCollectionChangedAction.Add, element);
_copy.Add(element);
});
}
}
private void HandleReset()
{
_copy.ForEach(a => HandleElement(NotifyCollectionChangedAction.Remove, a));
_collection.ForEach(a => HandleElement(NotifyCollectionChangedAction.Add, a));
_copy.Clear();
_copy.AddRange(_collection);
}