private bool GetIsFiltering()
{
// Generally our hierarchy is at max 3 levels deep, this can be cached if we find it problematic
SimpleCollectionView parent = this;
while (parent != null)
{
if (parent.Options?.Filter != null)
{
return(true);
}
parent = parent.parent;
}
SimpleCollectionViewOptions childOptions = Options.ChildOptions;
while (childOptions != null)
{
if (childOptions.Filter != null)
{
return(true);
}
childOptions = childOptions.ChildOptions;
}
return(false);
}
private SimpleCollectionView(IEnumerable source, SimpleCollectionViewOptions options, SimpleCollectionView parent = null, string key = null, object item = null)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
this.wasFilterNull = (options.Filter == null);
this.source = source;
this.parent = parent;
this.item = item;
this.key = key;
SetOptions(options, notify: false);
var changed = source as INotifyCollectionChanged;
if (changed != null)
{
changed.CollectionChanged += OnSourceCollectionChanged;
}
}
private void SetOptions(SimpleCollectionViewOptions newOptions, bool notify = true)
{
if (this.options != null)
{
this.options.PropertyChanged -= OnOptionsPropertyChanged;
}
this.options = newOptions;
if (this.options != null)
{
this.options.PropertyChanged += OnOptionsPropertyChanged;
}
Reset(notify);
}
public SimpleCollectionView(IEnumerable source, SimpleCollectionViewOptions options)
: this(source, options, null, null)
{
}
