private void OnAllSelected()
{
if (SubGroupSelector == null)
{
if (Selection.SelectedItems.Count() != this.ItemsSource.Count())
{
selectionZone.AddItems(ItemsSource);
}
else
{
selectionZone.ClearSelection();
}
}
else
{
//source is grouped... need to recursively select them all.
var flattenedItems = this.ItemsSource?.SelectManyRecursive(x => SubGroupSelector(x));
if (flattenedItems.Count() != Selection.SelectedItems.Count())
{
selectionZone.AddItems(flattenedItems);
}
else
{
selectionZone.ClearSelection();
}
}
}
private void OnHeaderToggled(HeaderItem <TItem> headerItem)
{
// Doesn't seem to be any difference in the behavior for clicking the Header vs the checkmark in the header.
//does selection contain this item already?
if (Selection.SelectedItems.Contains(headerItem.Item))
{
//deselect it and all children
var items = SubGroupSelector(headerItem.Item)?.RecursiveSelect <TItem, TItem>(r => SubGroupSelector(r), i => i).Append(headerItem.Item);
SelectionZone.RemoveItems(items);
}
else
{
//select it and all children
var items = SubGroupSelector(headerItem.Item)?.RecursiveSelect <TItem, TItem>(r => SubGroupSelector(r), i => i).Append(headerItem.Item);
SelectionZone.AddItems(items);
}
}