/// <summary>アイテムを上下に一つ移動</summary>
public bool bxMoveItems(ListBox box, int direction, IList boxItemsSource = null)
{
try
{
if (box == null || box.SelectedIndex < 0) return false;
var boxItems = boxItemsSource ?? box.Items;
var selected = box.SelectedItemsList();//連続移動の視点固定のため順番保持
int iCount = boxItems.Count;//固定
var r = direction >= 0 ? (Func<int, int>)(i => iCount - 1 - i) : (i => i);
for (int i = 0; i < boxItems.Count; i++)
{
var item = boxItems[r(i)];
if (box.SelectedItems.Contains(item) == true)
{
boxItems.RemoveAt(r(i));
boxItems.Insert(r((i + iCount - 1) % iCount), item);
if (i == 0) break;
}
}
box.UnselectAll();
TargetBoxItemsRefresh(box, boxItemsSource);
box.SelectedItemsAdd(selected);
box.ScrollIntoView(direction < 0 ? selected[0] : selected.Last());
}
catch (Exception ex) { MessageBox.Show(ex.Message + "\r\n" + ex.StackTrace); }
return true;
}
/// <summary>アイテムをボックス内にドロップ</summary>
public bool bxMoveItemsDrop(ListBox box, object dropTo, IList boxItemsSource = null)
{
try
{
if (box == null || box.SelectedIndex < 0) return false;
var boxItems = boxItemsSource ?? box.Items;
//選択の上と下でドロップ位置を調整する。
int idx_dropTo = boxItems.IndexOf(dropTo);
idx_dropTo = idx_dropTo < 0 ? boxItems.Count : idx_dropTo;
idx_dropTo += (idx_dropTo >= box.SelectedIndex ? 1 : 0);
var selected = box.SelectedItemsList(true);
var insertItem = boxItems.Cast<object>().Skip(idx_dropTo).FirstOrDefault(item => !selected.Contains(item));
boxItems.RemoveItemsAx(selected);//削除はこのタイミング
int insertIdx = insertItem == null ? boxItems.Count : boxItems.IndexOf(insertItem);
boxItems.InsertItemsAx(insertIdx, selected);
box.SelectedItemsAdd(selected);
TargetBoxItemsRefresh(box, boxItemsSource);
box.ScrollIntoViewIndex(insertItem == null ? int.MaxValue : box.SelectedIndex);
}
catch (Exception ex) { MessageBox.Show(ex.Message + "\r\n" + ex.StackTrace); }
return true;
}
/// <summary>選択アイテム追加・挿入</summary>
public bool bxAddItems(ListBox src, ListBox target, bool IsInsert = false, IList trgItemsSource = null)
{
if (src == null) return false;
//
return bxAddItems(src.SelectedItemsList(true), target, IsInsert, trgItemsSource);
}
