internal static void AddDragEnterHandler(DependencyObject element, CustomDragEventHandler handler, bool handledEventsToo)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
CustomExtendedRoutedEventHandlerCollection<CustomDragEventHandler, CustomDragEventArgs> dragEnterHandlers = element.GetDragEnterHandlers();
CustomExtendedRoutedEventHandlerCollection<CustomDragEventHandler, CustomDragEventArgs> handlers2 = dragEnterHandlers ?? new CustomExtendedRoutedEventHandlerCollection<CustomDragEventHandler, CustomDragEventArgs>((h, a) => h(element, a));
handlers2.Add(handler, handledEventsToo);
if (handlers2 != dragEnterHandlers)
{
element.SetValue(DragEnterHandlerProperty, handlers2);
}
}
internal static void RemoveDragEnterHandler(DependencyObject element, CustomDragEventHandler handler)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
CustomExtendedRoutedEventHandlerCollection<CustomDragEventHandler, CustomDragEventArgs> dragEnterHandlers = element.GetDragEnterHandlers();
if (dragEnterHandlers != null)
{
dragEnterHandlers.Remove(handler);
}
}
/// <summary>
/// Adds a handler to the attached DragEnter event.
/// </summary>
/// <param name="element">The DependencyObject to attach an event handler for.</param>
/// <param name="handler">The event handler.</param>
/// <param name="handledEventsToo">A value Indicating whether to invoke the handler if the event is handled.</param>
internal static void AddDragEnterHandler(DependencyObject element, DragEventHandler handler, bool handledEventsToo)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
ExtendedRoutedEventHandlerCollection<DragEventHandler, DragEventArgs> originalHandlers = element.GetDragEnterHandlers();
ExtendedRoutedEventHandlerCollection<DragEventHandler, DragEventArgs> handlers = originalHandlers ?? new ExtendedRoutedEventHandlerCollection<DragEventHandler, DragEventArgs>((h, a) => h(element, a));
handlers.Add(handler, handledEventsToo);
if (handlers != originalHandlers)
{
element.SetValue(DragEnterHandlerProperty, handlers);
}
}