private void OnItemCollectionSourceChangedSafe(NotifyCollectionChangedEventArgs e)
{
VerifySafe();
if (e.Action == NotifyCollectionChangedAction.Move)
{
}
else if (e.Action == NotifyCollectionChangedAction.Reset)
{
if (SupportsIndex)
{
if (MultipleSelection)
{
CurrentSelectionCollection.UpdateIndicesSources();
}
if (CurrentSelectedIndex != -1)
{
var source = GetSource(CurrentSelectedIndex);
Sync(source != null ? CurrentSelection.WithSource(source) : CurrentSelection.WithIndex(-1));
}
}
}
else
{
if (e.NewItems != null)
{
foreach (var source in e.NewItems)
{
if (IsSourceSelected(source))
{
SelectSourceSafe(source);
}
}
}
if (e.OldItems != null)
{
foreach (var source in e.OldItems)
{
if (IsSourceInSelection(source))
{
UnselectSourceSafe(source);
}
}
}
}
SyncIndex(false);
EnsureSelection();
}
private void SyncIndex(int itemIndex)
{
if (itemIndex == CurrentSelectedIndex)
{
return;
}
if (MultipleSelection)
{
if (CurrentSelectionCollection.FindByIndex(itemIndex, out var selection))
{
if (itemIndex != selection.Index)
{
CurrentSelectionCollection.UpdateSelection(itemIndex, selection);
}
}
}
Sync(CurrentSelection.WithIndex(itemIndex));
}