Amoeba.Windows.OptionsWindow._clientFiltersListView_PreviewMouseLeftButtonDown C# (CSharp) Method

        private void _clientFiltersListView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            var selectIndex = _clientFiltersListView.SelectedIndex;
            if (selectIndex == -1)
            {
                _clientFiltersProxyUriTextBox.Text = "";
                _clientFiltersConditionTextBox.Text = "tcp:.*";
                _clientFiltersConnectionTypeComboBox.SelectedItem = ConnectionType.Tcp;
                _clientFiltersConditionSchemeComboBox.SelectedIndex = 0;
                _clientFiltersOptionTextBox.Text = "";

                return;
            }

            var item = _clientFiltersListView.SelectedItem as ConnectionFilter;
            if (item == null) return;

            if (item.ProxyUri != null)
            {
                _clientFiltersProxyUriTextBox.Text = item.ProxyUri;
            }
            else
            {
                _clientFiltersProxyUriTextBox.Text = "";
            }

            if (item.UriCondition != null)
            {
                _clientFiltersConditionTextBox.Text = item.UriCondition.Value;

                var regex = new Regex(@"(.+?):(.*)");
                Match match = regex.Match(item.UriCondition.Value);

                if (match.Success)
                {
                    var conboboxItem = _clientFiltersConditionSchemeComboBox.Items.Cast<ComboBoxItem>()
                        .FirstOrDefault(n => (string)n.Content == match.Groups[1].Value);

                    if (conboboxItem != null)
                    {
                        conboboxItem.IsSelected = true;
                    }
                }
            }
            else
            {
                _clientFiltersConditionTextBox.Text = "";
            }

            if (item.Option != null)
            {
                _clientFiltersOptionTextBox.Text = item.Option;
            }
            else
            {
                _clientFiltersOptionTextBox.Text = "";
            }

            _clientFiltersConnectionTypeComboBox.SelectedItem = item.ConnectionType;
        }