/// <exception cref="T:System.InvalidOperationException">Cannot host the same TriggerCollection on more than one object at a time.</exception>
private static void OnTriggersChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
TriggerCollection triggerCollection1 = args.OldValue as TriggerCollection;
TriggerCollection triggerCollection2 = args.NewValue as TriggerCollection;
if (triggerCollection1 == triggerCollection2)
{
return;
}
if (triggerCollection1 != null && triggerCollection1.AssociatedObject != null)
{
triggerCollection1.Detach();
}
if (triggerCollection2 == null || obj == null)
{
return;
}
if (triggerCollection2.AssociatedObject != null)
{
throw new InvalidOperationException("Cannot Host TriggerCollection Multiple Times");
}
FrameworkElement fElement = obj as FrameworkElement;
if (fElement == null)
{
throw new InvalidOperationException("Can only host BehaviorCollection on FrameworkElement");
}
triggerCollection2.Attach(fElement);
}
/// <exception cref="T:System.InvalidOperationException">Cannot host the same TriggerCollection on more than one object at a time.</exception>
private static void OnTriggersChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
TriggerCollection triggerCollection1 = args.OldValue as TriggerCollection;
TriggerCollection triggerCollection2 = args.NewValue as TriggerCollection;
if (triggerCollection1 == triggerCollection2)
{
return;
}
if (triggerCollection1 != null && triggerCollection1.AssociatedObject != null)
{
triggerCollection1.Detach();
}
if (triggerCollection2 == null || obj == null)
{
return;
}
if (triggerCollection2.AssociatedObject != null)
{
//todo: check why uncommenting the following line causes an issue with the Userware KanBan demo (CSHTML5 2.0.0-alpha67-087).
//throw new InvalidOperationException("Cannot Host TriggerCollection Multiple Times");
}
FrameworkElement fElement = obj as FrameworkElement;
if (fElement == null)
{
throw new InvalidOperationException("Can only host BehaviorCollection on FrameworkElement");
}
triggerCollection2.Attach(fElement);
}
/// <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 OnTriggerListChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
TriggerCollection list = e.OldValue as TriggerCollection;
if (list != null)
{
list.Detach();
}
list = e.NewValue as TriggerCollection;
FrameworkElement fe = dpo as FrameworkElement;
if (list != null && fe != null)
{
list.Attach(fe);
}
}