private async Task SelectAdjacentItem(int direction)
{
if (_items == null || _items.Count == 0)
{
return;
}
var index = _items.FindIndex(x => x.ItemId == (string)_activeItemId);
if (direction < 0 && index < 0)
{
index = 0;
}
MudSelectItem <T> item = null;
// the loop allows us to jump over disabled items until we reach the next non-disabled one
for (int i = 0; i < _items.Count; i++)
{
index += direction;
if (index < 0)
{
index = 0;
}
if (index >= _items.Count)
{
index = _items.Count - 1;
}
if (_items[index].Disabled)
{
continue;
}
item = _items[index];
if (!MultiSelection)
{
_selectedValues.Clear();
_selectedValues.Add(item.Value);
await SetValueAsync(item.Value, updateText : true);
HilightItem(item);
break;
}
else
{
// in multiselect mode don't select anything, just hilight.
// selecting is done by Enter
HilightItem(item);
break;
}
}
await _elementReference.SetText(Text);
if (item != null)
{
await ScrollManager.ScrollToListItemAsync(item.ItemId, direction, true);
}
}
private ValueTask ScrollToItemAsync(MudSelectItem <T> item) => item != null?ScrollManager.ScrollToListItemAsync(item.ItemId) : ValueTask.CompletedTask;
