/// <summary>
/// Gets the System.Windows.Interactivity.BehaviorCollection associated with
/// a specified object.
/// </summary>
/// <param name="obj">The object from which to retrieve the System.Windows.Interactivity.BehaviorCollection.</param>
/// <returns>
/// A System.Windows.Interactivity.BehaviorCollection containing the behaviors
/// associated with the specified object.
/// </returns>
public static BehaviorCollection GetBehaviors(DependencyObject obj)
{
if (obj.GetValue(BehaviorsProperty) == null)
{
BehaviorCollection col = new BehaviorCollection();
col.Attach(obj);
obj.SetValue(BehaviorsProperty, col);
}
return((BehaviorCollection)obj.GetValue(BehaviorsProperty));
}
/// <summary>
/// This is called when the behavior collection is changed on an object.
/// </summary>
/// <param name="dpo">FrameworkElement owner</param>
/// <param name="e"></param>
private static void OnBehaviorListChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
BehaviorCollection list = e.OldValue as BehaviorCollection;
if (list != null)
{
list.Detach();
}
list = e.NewValue as BehaviorCollection;
FrameworkElement fe = dpo as FrameworkElement;
if (list != null && fe != null)
{
list.Attach(fe);
}
}
private static void OnBehaviorsChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
BehaviorCollection oldValue = (BehaviorCollection)args.OldValue;
BehaviorCollection newValue = (BehaviorCollection)args.NewValue;
if (oldValue != newValue)
{
if (oldValue != null && ((IAttachedObject)oldValue).AssociatedObject != null)
{
oldValue.Detach();
}
if (newValue != null && obj != null)
{
if (((IAttachedObject)newValue).AssociatedObject != null)
{
throw new InvalidOperationException(ExceptionStringTable.CannotHostBehaviorCollectionMultipleTimesExceptionMessage);
}
newValue.Attach(obj);
}
}
}
