/// <summary>
/// Instructs the component to show the specified page.
/// </summary>
/// <param name="criteria">Details of the page to be displayed.</param>
public async Task PageAsync(PageCriteria criteria)
{
SetPageCriteria(criteria);
await GetDataAsync().ConfigureAwait(true);
await PageChanged.InvokeAsync(criteria).ConfigureAwait(true);
}
protected async Task OnPaginationItemClick(string pageName)
{
if (int.TryParse(pageName, out var pageNumber))
{
CurrentPage = pageNumber;
}
else
{
if (pageName == "prev")
{
CurrentPage--;
if (CurrentPage < 1)
{
CurrentPage = 1;
}
}
else if (pageName == "next")
{
CurrentPage++;
if (CurrentPage > LastPage)
{
CurrentPage = LastPage;
}
}
}
await PageChanged.InvokeAsync(new DataGridPageChangedEventArgs( CurrentPage, PageSize ));
if (ReadData.HasDelegate)
{
await HandleReadData();
}
}
protected void FetchBatch(int batchIndex)
{
if (_provider == null)
{
return;
}
_isFetching = true;
if (_tokenSource != null)
{
_tokenSource.Cancel();
}
_tokenSource = new CancellationTokenSource();
Task.Run(
async() =>
{
var tokenSource = _tokenSource;
try
{
var batch = await _provider.FetchAsync(batchIndex, ItemsPerPage, tokenSource.Token);
if (!tokenSource.IsCancellationRequested)
{
var previousPage = _page;
_page = batchIndex;
_totalItems = batch.Total;
_totalPages = (int)Math.Ceiling((double)batch.Total / ItemsPerPage);
_items = batch.Items;
// Check whether we changed the page or just reloaded it
if (_page != previousPage)
{
await PageChanged.InvokeAsync(batchIndex);
}
StateHasChanged();
}
}
catch (Exception ex)
{
_errorMessage = "Items couldn't be fetched";
_showRetryButton = true;
ConsoleHelper.WriteExceptionFromComponent(ex, typeof(LxPaging <>));
}
finally
{
tokenSource.Dispose();
if (_tokenSource == tokenSource)
{
_isFetching = false;
_tokenSource = null;
StateHasChanged();
}
}
});
}
protected async Task OnPageClick(string uri, int page)
{
UriHelper.NavigateTo(uri, false);
await PageChanged.InvokeAsync(page);
}
