/// <summary>
/// Synchronizes the group descriptions collection to the group descriptors collection.
/// </summary>
/// <param name="descriptor">The descriptor that changed</param>
/// <param name="e">The property change event</param>
private void HandleGroupDescriptorChanged(GroupDescriptor descriptor, PropertyChangedEventArgs e)
{
this._ignoreChanges = true;
try
{
// We have to reset when the collections were not equal before the change
if (this._sourceCollection.Count != this._descriptionCollection.Count)
{
GroupCollectionManager.ResetToGroupDescriptors(this._descriptionCollection, this._sourceCollection);
}
else
{
int index = this._sourceCollection.IndexOf(descriptor);
GroupDescription description = GroupCollectionManager.GetDescriptionFromDescriptor(descriptor);
if (description == null)
{
this._descriptionCollection.RemoveAt(index);
}
else
{
this._descriptionCollection[index] = description;
}
}
}
finally
{
this._ignoreChanges = false;
}
}
/// <summary>
/// Determines whether the <paramref name="groupDescription"/> and <paramref name="groupDescriptor"/> are equivalent.
/// </summary>
/// <param name="groupDescription">The description to compare</param>
/// <param name="groupDescriptor">The descriptor to compare</param>
/// <returns><c>true</c> if the two are equivalent</returns>
private static bool AreEquivalent(GroupDescription groupDescription, GroupDescriptor groupDescriptor)
{
Debug.Assert((groupDescription != null) && (groupDescriptor != null), "Both should be non-null.");
PropertyGroupDescription propertyGroupDescription = groupDescription as PropertyGroupDescription;
if (propertyGroupDescription == null)
{
return false;
}
return (propertyGroupDescription.PropertyName == groupDescriptor.PropertyPath);
}
/// <summary>
/// Returns a <see cref="GroupDescription"/> equivalent to the specified descriptor.
/// </summary>
/// <param name="groupDescriptor">The descriptor to get a description from</param>
/// <returns>A <see cref="GroupDescription"/> equivalent to the specified descriptor</returns>
private static GroupDescription GetDescriptionFromDescriptor(GroupDescriptor groupDescriptor)
{
if (string.IsNullOrEmpty(groupDescriptor.PropertyPath))
{
return null;
}
return new PropertyGroupDescription(groupDescriptor.PropertyPath);
}