private void AddSelection(SelectableViewModel selectable)
{
selectionOrder.Add(selectable);
if (selectionOrder.Count > maximumSelectedCount)
{
selectionOrder[0].IsSelected = false;
}
}
private void OnIsSelectedChanged(object sender, EventArgs e)
{
SelectableViewModel selectable = sender as SelectableViewModel;
if (selectable.IsSelected)
{
AddSelection(selectable);
}
else
{
RemoveSelection(selectable);
}
RaiseSelectionChanged();
}
private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
SelectableViewModel selectable = e.Item as SelectableViewModel;
if (e.Action == NotifyCollectionChangedAction.Remove)
{
RemoveSelection(selectable);
selectable.IsSelectedChanged -= OnIsSelectedChanged;
}
else if (e.Action == NotifyCollectionChangedAction.Add)
{
if (selectable.IsSelected)
{
AddSelection(selectable);
}
selectable.IsSelectedChanged += OnIsSelectedChanged;
}
else
{
throw new Exception("Unsupported collection action");
}
}
private void RemoveSelection(SelectableViewModel selectable)
{
selectionOrder.Remove(selectable);
}
