/* ----------------------------------------------------------------- */
///
/// RemoveAt
///
/// <summary>
/// Removes the specified images.
/// </summary>
///
/// <param name="src">Source collection.</param>
/// <param name="indices">Collection to be removed.</param>
///
/// <returns>
/// History item to execute undo and redo actions.
/// </returns>
///
/* ----------------------------------------------------------------- */
public static HistoryItem RemoveAt(this ImageCollection src, IEnumerable <int> indices)
{
var items = GetPair(src, indices.OrderBy(i => i));
return(HistoryItem.Invoke(
() => src.Remove(indices),
() => items.Each(e => src.Insert(e.Key, new[] { e.Value }))
));
}
/* ----------------------------------------------------------------- */
///
/// InsertAt
///
/// <summary>
/// Inserts the specified items behind the specified index.
/// </summary>
///
/// <param name="src">Source collection.</param>
/// <param name="index">Insertion index.</param>
/// <param name="items">Insertion items.</param>
///
/// <returns>
/// History item to execute undo and redo actions.
/// </returns>
///
/* ----------------------------------------------------------------- */
public static HistoryItem InsertAt(this ImageCollection src, int index, IEnumerable <Page> items)
{
var copy = items.ToList();
var indices = Enumerable.Range(index, copy.Count);
return(HistoryItem.CreateInvoke(
() => src.Insert(index, copy),
() => src.Remove(indices)
));
}
/* ----------------------------------------------------------------- */
///
/// RemoveAt
///
/// <summary>
/// Removes the specified images.
/// </summary>
///
/// <param name="src">Source collection.</param>
/// <param name="indices">Collection to be removed.</param>
///
/// <returns>
/// History item to execute undo and redo actions.
/// </returns>
///
/* ----------------------------------------------------------------- */
public static HistoryItem RemoveAt(this ImageCollection src, IEnumerable <int> indices)
{
var items = GetPair(src, indices.OrderBy(i => i));
return(HistoryItem.CreateInvoke(
() => src.Remove(indices),
() => { foreach (var kv in items)
{
src.Insert(kv.Key, new[] { kv.Value });
}
}
));
}