void AdaptiveSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
foreach (var item in e.RemovedItems)
{
var to_remove =
(from sm in SelectionMarkers
where !sm.IsDragging && object.Equals(sm.Item, item)
select sm).ToArray();
foreach (var td in to_remove)
SelectionMarkers.Remove(td);
}
foreach (var item in e.AddedItems)
{
var existing_marker =
(from sm in SelectionMarkers
where object.Equals(sm.Item, item)
select sm).FirstOrDefault();
if (existing_marker != null)
continue;
var new_marker = new SelectionMarker() { Item = item };
SelectionMarkers.Add(new_marker);
var group = (object) SelectorLogic.GetItemGroup(this, SelectorIdentifier, item);
if (group != null)
{
// disable others within same group
var other_with_same_group =
(from si in this.SelectedItems.Cast<object>()
let si_group = SelectorLogic.GetItemGroup(this, SelectorIdentifier, si)
// same group, different item
where object.Equals(si_group, @group) && !ItemEqualityComparer.Equals(si, item)
select si).ToList();
foreach (var rem in other_with_same_group)
{
SelectedItems.Remove(rem);
}
}
}
// make sure only one item from single-selection groups is selected at the time
}
void RefreshMarker(SelectionMarker marker)
{
var offset = GetOffset(marker.Item);
marker.Left = offset;
var width = GetThumbWidth(marker.Item);
marker.Width = width;
}