private SearchCountriesRequest CreateSearchRequest(string text)
{
SearchCountriesRequest request;
if (!_searchResultsCache.TryGetValue(text, out request))
{
IList <Country> source;
if (_lastSearchRequest != null &&
text.IndexOf(_lastSearchRequest.Text, StringComparison.OrdinalIgnoreCase) != -1)
{
source = _lastSearchRequest.Source;
}
else
{
_source = _source ?? CountryUtils.CountriesSource;
source = _source;
}
request = new SearchCountriesRequest(text, source);
}
return(request);
}
private void SearchInternal(string text)
{
if (_lastSearchRequest != null)
{
_lastSearchRequest.Cancel();
}
if (string.IsNullOrEmpty(text))
{
LazySearchItems.Clear();
SearchItems.Clear();
foreach (var contact in _source)
{
SearchItems.Add(contact);
}
return;
}
var nextSearchRequest = CreateSearchRequest(text);
IsWorking = true;
nextSearchRequest.ProcessAsync(results =>
Execute.BeginOnUIThread(() =>
{
if (nextSearchRequest.IsCanceled)
{
return;
}
SearchItems.Clear();
LazySearchItems.Clear();
for (var i = 0; i < results.Count; i++)
{
if (i < 8)
{
SearchItems.Add(results[i]);
}
else
{
LazySearchItems.Add(results[i]);
}
}
IsWorking = false;
Status = Items.Count == 0 ? AppResources.NoResults : string.Empty;
Telegram.Api.Helpers.Execute.BeginOnUIThread(() =>
{
if (!String.Equals(text, Text, StringComparison.OrdinalIgnoreCase))
{
return;
}
foreach (var lazySearchItem in LazySearchItems)
{
SearchItems.Add(lazySearchItem);
}
LazySearchItems.Clear();
});
}));
_searchResultsCache[nextSearchRequest.Text] = nextSearchRequest;
_lastSearchRequest = nextSearchRequest;
}