/// <summary>
/// Getter for <see cref="AttachedVisualsProperty"/>
/// </summary>
public static VisualAttachmentCollection <IAttachable> GetAttachedVisuals(DependencyObject obj)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
var collection = (VisualAttachmentCollection <IAttachable>)obj.GetValue(AttachedVisualsProperty);
// If the collection wasn't yet set
if (collection == null)
{
// Create a new instance
collection = new VisualAttachmentCollection <IAttachable>();
// And set it for the object
obj.SetValue(AttachedVisualsProperty, collection);
if (obj is FrameworkElement element)
{
// Subscribe to loaded and unloaded events
element.Loaded -= FrameworkElementLoaded;
element.Loaded += FrameworkElementLoaded;
element.Unloaded -= FrameworkElementUnloaded;
element.Unloaded += FrameworkElementUnloaded;
}
}
return(collection);
}
/// <summary>
/// Setter for <see cref="AttachedVisualsProperty"/>
/// </summary>
public static void SetAttachedVisuals(DependencyObject obj, VisualAttachmentCollection <IAttachable> value)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
obj.SetValue(AttachedVisualsProperty, value);
}