async void OnSearchClicked(object sender, EventArgs e)
{
if (_isRunning)
{
return;
}
_isRunning = true;
try
{
var searchText = _searchEntry.Text.Trim();
if (string.IsNullOrEmpty(searchText))
{
_listView.SelectedItem =
_twitterViewModel.Tweets = null;
_backgroundImage.IsVisible = true;
return;
}
await Task.Run(async() =>
{
await _twitterViewModel.Search(searchText);
});
if (_twitterViewModel.Tweets != null && _twitterViewModel.Tweets.Count > 0)
{
_backgroundImage.IsVisible = false;
}
else
{
_listView.SelectedItem = null;
_backgroundImage.IsVisible = true;
}
}
finally
{
_isRunning = false;
}
}
