/// <summary>
/// Updates the user interface with the Geovisit data provided
/// </summary>
/// <param name="visit">Geovisit to display its details</param>
private void UpdateLastVisit(Geovisit visit)
{
if (visit == null)
{
ScenarioOutput_Latitude.Text = "No data";
ScenarioOutput_Longitude.Text = "No data";
ScenarioOutput_Accuracy.Text = "No data";
ScenarioOutput_Timestamp.Text = "No data";
ScenarioOutput_VisitStateChange.Text = "No data";
}
else
{
// A valid visit is available, extract the state change and Timestamp.
ScenarioOutput_VisitStateChange.Text = visit.StateChange.ToString();
ScenarioOutput_Timestamp.Text = visit.Timestamp.ToString();
// If a valid position is available, extract the position information that caused the state change to happen.
if (visit.Position == null)
{
ScenarioOutput_Latitude.Text = "No data";
ScenarioOutput_Longitude.Text = "No data";
ScenarioOutput_Accuracy.Text = "No data";
}
else
{
ScenarioOutput_Latitude.Text = visit.Position.Coordinate.Point.Position.Latitude.ToString();
ScenarioOutput_Longitude.Text = visit.Position.Coordinate.Point.Position.Longitude.ToString();
ScenarioOutput_Accuracy.Text = visit.Position.Coordinate.Accuracy.ToString();
}
}
}
private string GenerateVisitDescription(Geovisit visit)
{
string result = $"{visit.Timestamp:G} {visit.StateChange}";
// Check if the report has a valid position.
if (visit.Position != null)
{
result += $" ({visit.Position.Coordinate.Point.Position.Latitude}, {visit.Position.Coordinate.Point.Position.Longitude})";
}
return(result);
}
/// <summary>
/// This is the click handler for the 'getLastVisit' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void GetLastVisitButtonClicked(object sender, RoutedEventArgs e)
{
GetLastVisitButton.IsEnabled = false;
LocationDisabledMessage.Visibility = Visibility.Collapsed;
// Request permission to access location
var accessStatus = await Geolocator.RequestAccessAsync();
Geovisit visit = null;
switch (accessStatus)
{
case GeolocationAccessStatus.Allowed:
_rootPage.NotifyUser("Waiting for update...", NotifyType.StatusMessage);
// Get the last visit report, if any. This should be a quick operation.
visit = await GeovisitMonitor.GetLastReportAsync();
_rootPage.NotifyUser("Visit info updated.", NotifyType.StatusMessage);
break;
case GeolocationAccessStatus.Denied:
_rootPage.NotifyUser("Access to location is denied.", NotifyType.ErrorMessage);
LocationDisabledMessage.Visibility = Visibility.Visible;
break;
default:
case GeolocationAccessStatus.Unspecified:
_rootPage.NotifyUser("Unspecified error.", NotifyType.ErrorMessage);
break;
}
UpdateLastVisit(visit);
GetLastVisitButton.IsEnabled = true;
}
