bool SampleFilter(IObservableList <TreeNode <TreeViewItem> > nodes, Func <TreeViewItem, bool> filterFunc)
{
return(nodes.Count(x => {
var have_visible_children = (x.Nodes == null) ? false : SampleFilter(x.Nodes, filterFunc);
x.IsVisible = have_visible_children || filterFunc(x.Item);
return x.IsVisible;
}) > 0);
}
public static IObservable <bool> IsNonEmpty <T>(this IObservableList <T> self)
{
return(self.Count().Select(c => c > 0).DistinctUntilChanged());
}
bool SampleFilter(IObservableList<TreeNode<TreeViewItem>> nodes, Func<TreeViewItem,bool> filterFunc)
{
return nodes.Count(x => {
var have_visible_children = (x.Nodes==null) ? false : SampleFilter(x.Nodes, filterFunc);
x.IsVisible = have_visible_children || filterFunc(x.Item) ;
return x.IsVisible;
}) > 0;
}