private static int GetIndexOf(BehaviorCollection itemBehaviors, Behavior behavior)
{
int index = -1;
Behavior orignalBehavior = GetOriginalBehavior(behavior);
for (int i = 0; i < itemBehaviors.Count; i++)
{
Behavior currentBehavior = itemBehaviors[i];
if (currentBehavior == behavior ||
currentBehavior == orignalBehavior)
{
index = i;
break;
}
Behavior currentOrignalBehavior = GetOriginalBehavior(currentBehavior);
if (currentOrignalBehavior == behavior ||
currentOrignalBehavior == orignalBehavior)
{
index = i;
break;
}
}
return(index);
}
public static BehaviorCollection GetBehaviors(DependencyObject obj)
{
BehaviorCollection behaviorCollection = (BehaviorCollection)obj.GetValue(Interaction.BehaviorsProperty);
if (behaviorCollection == null)
{
behaviorCollection = new BehaviorCollection();
obj.SetValue(Interaction.BehaviorsProperty, behaviorCollection);
}
return(behaviorCollection);
}
private static void OnPropertyChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
var uie = dpo as UIElement;
if (uie == null)
{
return;
}
BehaviorCollection itemBehaviors = Interaction.GetBehaviors(uie);
var newBehaviors = e.NewValue as StylizedBehaviorCollection;
var oldBehaviors = e.OldValue as StylizedBehaviorCollection;
if (newBehaviors == oldBehaviors)
{
return;
}
if (oldBehaviors != null)
{
foreach (var behavior in oldBehaviors)
{
int index = GetIndexOf(itemBehaviors, behavior);
if (index >= 0)
{
itemBehaviors.RemoveAt(index);
}
}
}
if (newBehaviors != null)
{
foreach (var behavior in newBehaviors)
{
int index = GetIndexOf(itemBehaviors, behavior);
if (index < 0)
{
var clone = (Behavior)behavior.Clone();
SetOriginalBehavior(clone, behavior);
itemBehaviors.Add(clone);
}
}
}
}
private static void OnBehaviorsChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
BehaviorCollection behaviorCollection = (BehaviorCollection)args.OldValue;
BehaviorCollection behaviorCollection2 = (BehaviorCollection)args.NewValue;
if (behaviorCollection != behaviorCollection2)
{
if (behaviorCollection != null && ((IAttachedObject)behaviorCollection).AssociatedObject != null)
{
behaviorCollection.Detach();
}
if (behaviorCollection2 != null && obj != null)
{
if (((IAttachedObject)behaviorCollection2).AssociatedObject != null)
{
throw new InvalidOperationException("CannotHostBehaviorCollectionMultipleTimesExceptionMessage");
}
behaviorCollection2.Attach(obj);
}
}
}
