private void View_Poll(object sender, EventArgs e)
{
if (_queryEvaluator != null)
{
View.Items = _queryEvaluator.Update();
View.ItemSize = CurrentItemSize;
View.UpdateItems();
// update query evaluation status
if (StatusLabel != null)
{
var loadingPath = _queryEvaluator.Progress.LoadingPath;
var loadedCount = _queryEvaluator.Progress.FileCount;
StatusLabel.Text = loadingPath != null?
string.Format(Strings.Loading_Message, loadedCount, loadingPath) :
Strings.Done_Label;
}
// update item count
if (ItemCountLabel != null)
{
var itemCount = View.Items.Sum(pair => pair.Items.Count);
ItemCountLabel.Text = itemCount.ToString("N0") + " " + Strings.ItemCount_Label;
}
}
}
/// <summary>
/// Execute given query and show all entities in the result.
/// </summary>
/// <param name="query">Query to show</param>
public async Task LoadQueryAsync(IExecutableQuery query)
{
// release all resources used by the previous query
DisposeQuery();
_selection.Clear();
// start the query
_queryEvaluator = _queryEvaluatorFactory.Create(query);
View.Query = _queryEvaluator.Query.Text;
View.Items = _queryEvaluator.Update();
View.History.CanGoBackInHistory = _queryHistory.Previous != null;
View.History.CanGoForwardInHistory = _queryHistory.Next != null;
View.BeginLoading();
View.BeginPolling(PollingRate);
try
{
await _queryEvaluator.RunAsync();
if (!_isDisposed)
{
View.UpdateItems();
}
}
catch (OperationCanceledException)
{
}
finally
{
if (!_isDisposed)
{
View.EndLoading();
}
}
}