/// <summary>
/// Handles the CollectionChanged event for the ItemsSource property.
/// </summary>
/// <param name="sender">Event source.</param>
/// <param name="e">Event arguments..</param>
private void ItemsSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (null != ParentDefinitionSeries)
{
ParentDefinitionSeries.SeriesDefinitionItemsSourceCollectionChanged(this, e.Action, e.OldItems, e.OldStartingIndex, e.NewItems, e.NewStartingIndex);
}
}
/// <summary>
/// Resets the display of the series definition.
/// </summary>
private void Reset()
{
if (null != ParentDefinitionSeries)
{
ParentDefinitionSeries.SeriesDefinitionItemsSourceChanged(this, ItemsSource, ItemsSource);
}
}
/// <summary>
/// Handles changes to the ItemsSource property.
/// </summary>
/// <param name="oldValue">Old value.</param>
/// <param name="newValue">New value.</param>
private void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
{
// Remove handler for oldValue.CollectionChanged (if present)
INotifyCollectionChanged oldValueINotifyCollectionChanged = oldValue as INotifyCollectionChanged;
if (null != oldValueINotifyCollectionChanged)
{
// Detach the WeakEventListener
if (null != _weakEventListener)
{
_weakEventListener.Detach();
_weakEventListener = null;
}
}
// Add handler for newValue.CollectionChanged (if possible)
INotifyCollectionChanged newValueINotifyCollectionChanged = newValue as INotifyCollectionChanged;
if (null != newValueINotifyCollectionChanged)
{
// Use a WeakEventListener so that the backwards reference doesn't keep this object alive
_weakEventListener = new WeakEventListener <SeriesDefinition, object, NotifyCollectionChangedEventArgs>(this);
_weakEventListener.OnEventAction = (instance, source, eventArgs) => instance.ItemsSourceCollectionChanged(source, eventArgs);
_weakEventListener.OnDetachAction = (weakEventListener) => newValueINotifyCollectionChanged.CollectionChanged -= weakEventListener.OnEvent;
newValueINotifyCollectionChanged.CollectionChanged += _weakEventListener.OnEvent;
}
if (null != ParentDefinitionSeries)
{
ParentDefinitionSeries.SeriesDefinitionItemsSourceChanged(this, oldValue, newValue);
}
}
