/// <summary>
/// Refreshes all items int list.
/// </summary>
/// <typeparam name="T">The type of the items</typeparam>
/// <param name="this">This BindingList.</param>
/// <param name="items">The updated item list.</param>
/// <param name="keyGetter">The key getter to compare what items are added/removed/updated.</param>
/// <param name="itemUpdateMethod">The item update method; takes the old and new item reference and returns the updated item.</param>
public static void RefreshAll <T>(this BindingList <T> @this, IEnumerable <T> items, Func <T, string> keyGetter, Func <T, T, T> itemUpdateMethod)
{
var oldState = @this.RaiseListChangedEvents;
try {
@this.RaiseListChangedEvents = false;
var oldKeys = @this.ToDictionary(keyGetter);
var newKeys = items.ToDictionary(keyGetter);
// remove not longer needed items
foreach (var key in oldKeys.Keys.Where(k => !newKeys.ContainsKey(k)))
{
@this.Remove(oldKeys[key]);
}
foreach (var key in newKeys.Keys)
{
// add new items
if (!oldKeys.ContainsKey(key))
{
@this.Add(newKeys[key]);
continue;
}
// update items
var oldItem = oldKeys[key];
var newItem = itemUpdateMethod(oldItem, newKeys[key]);
if (!ReferenceEquals(oldItem, newItem))
{
@this[@this.IndexOf(oldItem)] = newItem;
}
}
} finally {
@this.RaiseListChangedEvents = oldState;
if (oldState)
{
@this.ResetBindings();
}
}
}
/// <summary>
/// Moves the given items relative.
/// </summary>
/// <typeparam name="TItem">The type of the items</typeparam>
/// <param name="this">This BindingList.</param>
/// <param name="items">The items.</param>
/// <param name="delta">The delta.</param>
public static void MoveRelative <TItem>(this BindingList <TItem> @this, IEnumerable <TItem> items, int delta)
{
#if NET40
Contract.Requires(@this != null);
Contract.Requires(items != null);
#endif
if (delta == 0)
{
return;
}
var raiseEvents = @this.RaiseListChangedEvents;
try {
@this.RaiseListChangedEvents = false;
var count = @this.Count - 1;
if (delta < 0)
{
var start = 0;
foreach (var item in items)
{
var index = @this.IndexOf(item);
if (index < 0)
{
continue;
}
@this.RemoveAt(index);
var newIndex = index + delta;
@this.Insert(newIndex < 0 ? start++ : newIndex, item);
}
}
else
{
var end = count;
foreach (var item in items.Reverse())
{
var index = @this.IndexOf(item);
if (index < 0)
{
continue;
}
@this.RemoveAt(index);
var newIndex = index + delta;
if (newIndex > end)
{
#if NET40
Contract.Assume(end >= 0);
#endif
@this.Insert(end--, item);
}
else
{
@this.Insert(newIndex, item);
}
}
}
} finally {
@this.RaiseListChangedEvents = raiseEvents;
@this.ResetBindings();
}
}
