private async Task HandleSelectOrMultiSelectDataItemClick(TItem clickedDataItem)
{
Contract.Requires(SelectionEnabled || MultiSelectionEnabled);
if (SelectionEnabled)
{
await SetSelectedDataItemWithEventCallback(clickedDataItem);
}
else // MultiSelectionEnabled
{
var selectedDataItems = SelectedDataItems?.ToHashSet() ?? new HashSet <TItem>();
if (selectedDataItems.Add(clickedDataItem) || // when the item was added
selectedDataItems.Remove(clickedDataItem)) // or removed... But because of || item removal is performed only when the item was not added!
{
await SetSelectedDataItemsWithEventCallback(selectedDataItems);
}
}
}
protected override CellTemplate GetItemCellTemplate(TItem item)
{
return(new CellTemplate
{
CssClass = "text-center",
Template = (RenderTreeBuilder builder) =>
{
builder.OpenElement(100, "input");
builder.AddAttribute(101, "type", "checkbox");
builder.AddAttribute(102, "class", "form-check-input");
bool selected = SelectedDataItems?.Contains(item) ?? false;
builder.AddAttribute(103, "checked", selected);
builder.AddAttribute(104, "onchange", EventCallback.Factory.Create <ChangeEventArgs>(this, HandleSelectDataItemClick(item, selected)));
builder.AddEventStopPropagationAttribute(105, "onclick", true);
builder.CloseElement(); // input
}
});
}