public static ISelectable HandleSingleSelection(Event evt)
{
ISelectable item = PickerUtils.PickedAllElementsOfType <ISelectable>().FirstOrDefault(i => i.CanSelect());
if (item != null)
{
var selected = item.IsSelected();
if (!selected && CanClearSelection(evt))
{
SelectionManager.Clear();
}
if (evt.modifiers == EventModifiers.Shift)
{
if (!selected)
{
RangeSelectItems((item as TimelineItemGUI)?.item);
}
}
else
{
HandleItemSelection(evt, item);
}
}
return(item);
}