internal static bool RaiseGroupByChanging(
GridViewTemplate template,
GroupDescriptor groupDescription,
NotifyCollectionChangedAction action)
{
GridGroupByExpression fromDescriptor = GridGroupByExpression.CreateFromDescriptor(groupDescription);
GridViewCollectionChangingEventArgs args;
if (action == NotifyCollectionChangedAction.Add || action == NotifyCollectionChangedAction.ItemChanged || action == NotifyCollectionChangedAction.Remove)
{
args = new GridViewCollectionChangingEventArgs(template, action, (object)fromDescriptor, 0, 0);
}
else
{
if (action != NotifyCollectionChangedAction.Batch)
{
throw new ArgumentException("Invalid action");
}
IList newItems = (IList) new List <GridGroupByExpression>();
newItems.Add((object)fromDescriptor);
args = new GridViewCollectionChangingEventArgs(template, action, newItems, (IList)template.GroupDescriptors, 0, 0, (PropertyChangingEventArgsEx)null);
}
template.EventDispatcher.RaiseEvent <GridViewCollectionChangingEventArgs>(EventDispatcher.GroupByChanging, (object)template, args);
if (!args.Cancel)
{
template.EventDispatcher.SuspendEvent(EventDispatcher.GroupByChanging);
template.EventDispatcher.SuspendEvent(EventDispatcher.GroupByChanged);
template.MasterTemplate.SynchronizationService.BeginDispatch();
}
return(args.Cancel);
}
