private static void OnStateTriggersPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CompositeStateTrigger trigger = (CompositeStateTrigger)d;
if (e.OldValue is INotifyCollectionChanged)
{
(e.OldValue as INotifyCollectionChanged).CollectionChanged -= trigger.CompositeTrigger_CollectionChanged;
}
else if (e.OldValue is Windows.Foundation.Collections.IObservableVector <DependencyObject> )
{
(e.OldValue as Windows.Foundation.Collections.IObservableVector <DependencyObject>).VectorChanged += trigger.CompositeStateTrigger_VectorChanged;
trigger.OnTriggerCollectionChanged((e.NewValue as Windows.Foundation.Collections.IObservableVector <DependencyObject>).OfType <StateTriggerBase>(),
null);
}
if (e.NewValue is INotifyCollectionChanged)
{
//TODO: Should be weak reference just in case
(e.NewValue as INotifyCollectionChanged).CollectionChanged += trigger.CompositeTrigger_CollectionChanged;
}
else if (e.NewValue is Windows.Foundation.Collections.IObservableVector <DependencyObject> )
{
(e.NewValue as Windows.Foundation.Collections.IObservableVector <DependencyObject>).VectorChanged += trigger.CompositeStateTrigger_VectorChanged;
trigger.OnTriggerCollectionChanged(null,
(e.NewValue as Windows.Foundation.Collections.IObservableVector <DependencyObject>).OfType <StateTriggerBase>());
}
if (e.NewValue is IEnumerable <StateTriggerBase> )
{
foreach (var item in e.NewValue as IEnumerable <StateTriggerBase> )
{
if (!(item is Windows.UI.Xaml.StateTrigger || !(item is ITriggerValue)))
{
try
{
throw new NotSupportedException("Only StateTrigger or triggers implementing ITriggerValue are supported in a Composite trigger");
}
finally
{
trigger.SetValue(StateTriggersProperty, e.OldValue); //Undo change
}
}
}
trigger.CompositeTrigger_CollectionChanged(e.NewValue,
new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (e.NewValue as IEnumerable <StateTriggerBase>).ToList()));
}
trigger.EvaluateTriggers();
}
private static void OnEvaluatePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CompositeStateTrigger trigger = (CompositeStateTrigger)d;
trigger.EvaluateTriggers();
}