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 AddDragLeaveHandler(DependencyObject element, CustomDragEventHandler handler)
{
AddDragLeaveHandler(element, handler, false);
}
internal static void RemoveDropHandler(DependencyObject element, CustomDragEventHandler handler)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
CustomExtendedRoutedEventHandlerCollection<CustomDragEventHandler, CustomDragEventArgs> dropHandlers = element.GetDropHandlers();
if (dropHandlers != null)
{
dropHandlers.Remove(handler);
}
}
