/// <summary>
/// Replaces a wrapped reference list, detaching contained items if needed, and confiures the wrapper to wrap a
/// replacement list.
/// </summary>
/// <param name='wrapperToOverwrite'>
/// The wrapper instance to overwrite.
/// </param>
/// <param name='replacement'>
/// The replacement source list.
/// </param>
/// <param name='referenceProperty'>
/// An expression indicating a property upon the contained type.
/// </param>
/// <param name='referenceItem'>
/// The reference item to be stored in the <paramref name="referenceProperty"/>.
/// </param>
/// <typeparam name='T'>
/// The type of item contained within the list.
/// </typeparam>
/// <remarks>
/// <para>
/// See the documentation of this type for detailled information on how this works and what it does.
/// </para>
/// </remarks>
public static void Replace <T>(ref IList <T> wrapperToOverwrite,
IList <T> replacement,
Expression <Func <T, object> > referenceProperty,
object referenceItem) where T : class
{
if (replacement == null)
{
throw new ArgumentNullException("replacement");
}
EventBoundListWrapper <T> typedList = wrapperToOverwrite as EventBoundListWrapper <T>;
if (typedList != null)
{
typedList.DetachAll();
}
PropertyInfo propInfo = Reflect.Property(referenceProperty);
foreach (T item in replacement)
{
propInfo.SetValue(item, referenceItem, null);
}
wrapperToOverwrite = GetOrInit(replacement, referenceProperty, referenceItem);
}
/// <summary>
/// Gets a wrapped reference list, initialising it if required.
/// </summary>
/// <returns>
/// A generic IList, with added addition and removal handlers.
/// </returns>
/// <param name='wrapper'>
/// The list wrapper instance to use.
/// </param>
/// <param name='original'>
/// The original/source list.
/// </param>
/// <param name='referenceProperty'>
/// An expression indicating a property upon the contained type.
/// </param>
/// <param name='referenceItem'>
/// The reference item to be stored in the <paramref name="referenceProperty"/>.
/// </param>
/// <typeparam name='T'>
/// The type of item contained within the list.
/// </typeparam>
/// <remarks>
/// <para>
/// See the documentation of this type for detailled information on how this works and what it does.
/// </para>
/// </remarks>
public static IList <T> GetOrInit <T>(ref IList <T> wrapper,
ref IList <T> original,
Expression <Func <T, object> > referenceProperty,
object referenceItem) where T : class
{
EventBoundListWrapper <T> typedList = wrapper as EventBoundListWrapper <T>;
if (typedList == null || !typedList.IsWrapping(original))
{
original = original ?? new List <T>();
wrapper = GetOrInit(original, referenceProperty, referenceItem);
}
return(wrapper);
}
/// <summary>
/// Initialises and returns a new list wrapper, wrapping the given <paramref name="original"/> collection.
/// </summary>
/// <returns>
/// A generic IList, with added addition and removal handlers.
/// </returns>
/// <param name='original'>
/// The original/source list.
/// </param>
/// <param name='referenceProperty'>
/// An expression indicating a property upon the contained type.
/// </param>
/// <param name='referenceItem'>
/// The reference item to be stored in the <paramref name="referenceProperty"/>.
/// </param>
/// <typeparam name='T'>
/// The type of item contained within the list.
/// </typeparam>
private static EventBoundListWrapper <T> GetOrInit <T>(IList <T> original,
Expression <Func <T, object> > referenceProperty,
object referenceItem) where T : class
{
if (original == null)
{
throw new ArgumentNullException("original");
}
EventBoundListWrapper <T> output = original as EventBoundListWrapper <T>;
if (output == null)
{
PropertyInfo propInfo = Reflect.Property(referenceProperty);
output = original.WrapWithBeforeActions((list, item) => BeforeAdd(list, item, propInfo, referenceItem),
(list, item) => BeforeRemove(list, item, propInfo));
}
return(output);
}
