bool WrapFilter(object item)
{
FilterEventArgs args = new FilterEventArgs(item);
FilterEventHandler handlers = FilterHandlersField.GetValue(this);
if (handlers != null)
{
handlers(this, args);
}
return(args.Accepted);
}
// Forward properties from the CollectionViewSource to the CollectionView
void ApplyPropertiesToView(ICollectionView view)
{
if (view == null || _deferLevel > 0)
{
return;
}
ICollectionViewLiveShaping liveView = view as ICollectionViewLiveShaping;
using (view.DeferRefresh())
{
int i, n;
// Culture
if (Culture != null)
{
view.Culture = Culture;
}
// Sort
if (view.CanSort)
{
view.SortDescriptions.Clear();
for (i = 0, n = SortDescriptions.Count; i < n; ++i)
{
view.SortDescriptions.Add(SortDescriptions[i]);
}
}
else if (SortDescriptions.Count > 0)
{
throw new InvalidOperationException(SR.Get(SRID.CannotSortView, view));
}
// Filter
Predicate <object> filter;
if (FilterHandlersField.GetValue(this) != null)
{
filter = FilterWrapper;
}
else
{
filter = null;
}
if (view.CanFilter)
{
view.Filter = filter;
}
else if (filter != null)
{
throw new InvalidOperationException(SR.Get(SRID.CannotFilterView, view));
}
// GroupBy
if (view.CanGroup)
{
view.GroupDescriptions.Clear();
for (i = 0, n = GroupDescriptions.Count; i < n; ++i)
{
view.GroupDescriptions.Add(GroupDescriptions[i]);
}
}
else if (GroupDescriptions.Count > 0)
{
throw new InvalidOperationException(SR.Get(SRID.CannotGroupView, view));
}
// Live shaping
if (liveView != null)
{
ObservableCollection <string> properties;
// sorting
if (liveView.CanChangeLiveSorting)
{
liveView.IsLiveSorting = IsLiveSortingRequested;
properties = liveView.LiveSortingProperties;
properties.Clear();
if (IsLiveSortingRequested)
{
foreach (string s in LiveSortingProperties)
{
properties.Add(s);
}
}
}
CanChangeLiveSorting = liveView.CanChangeLiveSorting;
IsLiveSorting = liveView.IsLiveSorting;
// filtering
if (liveView.CanChangeLiveFiltering)
{
liveView.IsLiveFiltering = IsLiveFilteringRequested;
properties = liveView.LiveFilteringProperties;
properties.Clear();
if (IsLiveFilteringRequested)
{
foreach (string s in LiveFilteringProperties)
{
properties.Add(s);
}
}
}
CanChangeLiveFiltering = liveView.CanChangeLiveFiltering;
IsLiveFiltering = liveView.IsLiveFiltering;
// grouping
if (liveView.CanChangeLiveGrouping)
{
liveView.IsLiveGrouping = IsLiveGroupingRequested;
properties = liveView.LiveGroupingProperties;
properties.Clear();
if (IsLiveGroupingRequested)
{
foreach (string s in LiveGroupingProperties)
{
properties.Add(s);
}
}
}
CanChangeLiveGrouping = liveView.CanChangeLiveGrouping;
IsLiveGrouping = liveView.IsLiveGrouping;
}
else
{
CanChangeLiveSorting = false;
IsLiveSorting = null;
CanChangeLiveFiltering = false;
IsLiveFiltering = null;
CanChangeLiveGrouping = false;
IsLiveGrouping = null;
}
}
}