/// <summary>
/// Resets the <paramref name="sortDescriptors"/> collection to match the <paramref name="sortDescriptions"/> collection.
/// </summary>
/// <param name="sortDescriptions">The collection to match</param>
/// <param name="sortDescriptors">The collection to reset</param>
private static void ResetToSortDescriptions(SortDescriptionCollection sortDescriptions, SortDescriptorCollection sortDescriptors)
{
sortDescriptors.Clear();
foreach (SortDescription description in sortDescriptions)
{
sortDescriptors.Add(SortCollectionManager.GetDescriptorFromDescription(description));
}
}
/// <summary>
/// Synchronizes the sort descriptors collection to the sort descriptions collection.
/// </summary>
/// <param name="e">The collection change event</param>
private void HandleSortDescriptionCollectionChanged(NotifyCollectionChangedEventArgs e)
{
this._ignoreChanges = true;
try
{
// We have to reset in a number of situations
// 1) Resetting the SortDescriptions
// 2) Collections were not equal before replacing SortDescriptions
// 3) Collections were not equal before removing SortDescriptions
// 4) Collections were not equal before adding SortDescriptions
if ((e.Action == NotifyCollectionChangedAction.Reset) ||
((e.Action == NotifyCollectionChangedAction.Replace) && ((this._sourceCollection.Count + e.NewItems.Count) != (this._descriptionCollection.Count + e.OldItems.Count))) ||
((e.Action == NotifyCollectionChangedAction.Remove) && (this._sourceCollection.Count != (this._descriptionCollection.Count + e.OldItems.Count))) ||
((e.Action == NotifyCollectionChangedAction.Add) && ((this._sourceCollection.Count + e.NewItems.Count) != this._descriptionCollection.Count)))
{
SortCollectionManager.ResetToSortDescriptions(this._descriptionCollection, this._sourceCollection);
}
else
{
if ((e.Action == NotifyCollectionChangedAction.Remove) ||
(e.Action == NotifyCollectionChangedAction.Replace))
{
int index = e.OldStartingIndex;
if (e.Action == NotifyCollectionChangedAction.Replace) // TODO: This is a ObservableCollection bug!
{
index = e.NewStartingIndex;
}
for (int i = 0; i < e.OldItems.Count; i++)
{
this._sourceCollection.RemoveAt(index);
}
}
if ((e.Action == NotifyCollectionChangedAction.Add) ||
(e.Action == NotifyCollectionChangedAction.Replace))
{
int index = e.NewStartingIndex;
foreach (object item in e.NewItems)
{
this._sourceCollection.Insert(index++, SortCollectionManager.GetDescriptorFromDescription((SortDescription)item));
}
}
}
}
finally
{
this._ignoreChanges = false;
}
}
