private async Task ExpandItem(DisplayableItem <TItem> item)
{
if (ItemDetails != null)
{
item.Content = await ItemDetails.Invoke(item.Item);
item.Expanded = true;
}
}
public bool AddItem(TItem item, TItem afterItem)
{
var indexF = 0;
if (afterItem != null)
{
indexF = Array.IndexOf(FixedData, afterItem);
if (indexF == -1)
{
return(false);
}
}
var anchorItem = FixedData[indexF];
var indexD = -1;
for (int i = 0; i < Data.Count; i++)
{
if (ReferenceEquals(Data[i].Item, anchorItem))
{
indexD = i;
break;
}
}
if (indexD == -1)
{
return(false);
}
var displayableItem = new DisplayableItem <TItem>(item);
if (afterItem != null)
{
FixedData = FixedData.Take(indexF + 1)
.Concat(new[] { item })
.Concat(FixedData.Skip(indexF + 1))
.ToArray();
Data = Data.Take(indexD + 1)
.Concat(new[] { displayableItem })
.Concat(Data.Skip(indexD + 1))
.ToList();
}
else
{
FixedData = new[] { item }.Concat(FixedData).ToArray();
Data = new[] { displayableItem }.Concat(Data).ToList();
}
StateHasChanged();
return(true);
}
private static void ContractItem(DisplayableItem <TItem> item)
{
item.Expanded = false;
}
