protected async Task HandleOnChanged(UIChangeEventArgs e)
{
if (IsMultiple)
{
// when multiple selection is enabled we need to use javascript to get the list of selected items
internalMultiValue = await JSRunner.GetSelectedOptions <TValue>(ElementId);
// changed event must be called before validation
await SelectedValuesChanged.InvokeAsync(internalMultiValue);
ParentValidation?.UpdateInputValue(internalMultiValue);
}
else
{
if (Converters.TryChangeType <TValue>(e.Value, out var value))
{
internalValue = value;
}
else
{
internalValue = default;
}
// changed event must be called before validation
await SelectedValueChanged.InvokeAsync(internalValue);
ParentValidation?.UpdateInputValue(internalValue);
}
}
public async Task SelectOption(string value)
{
if (!MultiSelection)
{
// single selection
Value = value;
isOpen = false;
IconContoller();
SelectedValues.Clear();
SelectedValues.Add(value);
}
else
{
// multi-selection: menu stays open
if (!SelectedValues.Contains(value))
{
SelectedValues.Add(value);
}
else
{
SelectedValues.Remove(value);
}
Value = string.Join(", ", SelectedValues);
}
StateHasChanged();
await SelectedValuesChanged.InvokeAsync(SelectedValues);
}
protected override Task OnInternalValueChanged(IReadOnlyList <TValue> value)
{
if (Multiple)
{
return(SelectedValuesChanged.InvokeAsync(value));
}
else
{
return(SelectedValueChanged.InvokeAsync(value == null ? default : value.FirstOrDefault()));
}
}
internal async Task UpdateSelectedItems()
{
if (_selectedValues == null)
{
_selectedValues = new HashSet <MudTreeViewItem <T> >();
}
//collect selected items
_selectedValues.Clear();
foreach (var item in _childItems)
{
foreach (var selectedItem in item.GetSelectedItems())
{
_selectedValues.Add(selectedItem);
}
}
await SelectedValuesChanged.InvokeAsync(new HashSet <T>(_selectedValues.Select(i => i.Value)));
}
