/* ----------------------------------------------------------------- */
///
/// MoveItems
///
/// <summary>
/// 項目を移動します。
/// </summary>
///
/// <remarks>
/// offset が正の数の場合は後ろに、負の数の場合は前に移動します。
/// </remarks>
///
/* ----------------------------------------------------------------- */
public void MoveItems(IEnumerable <int> indices, int offset)
{
if (offset == 0)
{
return;
}
var args = new MoveCancelEventArgs(indices.ToArray(), offset);
OnMoving(args);
if (args.Cancel || VirtualMode)
{
return;
}
var sorted = offset > 0 ?
indices.OrderByDescending(x => x) :
indices.OrderBy(x => x);
foreach (var index in sorted)
{
if (index < 0 || index >= Count)
{
continue;
}
var item = Items[index];
var selected = item.Selected;
var focused = item.Focused;
Items.RemoveAt(index);
var newindex = Math.Max(Math.Min(index + offset, Count), 0);
var result = Items.Insert(newindex, item);
if (result != null)
{
result.Selected = selected;
result.Focused = focused;
}
}
HackAlignmentBug();
OnMoved(new MoveEventArgs(indices.ToArray(), offset));
}
/* ----------------------------------------------------------------- */ /// /// OnMoving /// /// <summary> /// Moving イベントを発生させます。 /// </summary> /// /* ----------------------------------------------------------------- */ protected virtual void OnMoving(MoveCancelEventArgs e) => Moving?.Invoke(this, e);
