/// <summary>
/// Event handler for VisitStateChanged events. It is raised when
/// a new visit state change is available based on the monitoring scope specified.
/// </summary>
/// <param name="sender">Geovisitmonitor instance</param>
/// <param name="args">VisitStateChanged args data</param>
async private void OnVisitStateChanged(GeovisitMonitor sender, GeovisitStateChangedEventArgs args)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
_rootPage.NotifyUser("Visit state changed.", NotifyType.StatusMessage);
UpdateVisitData(args.Visit);
});
}
/// <summary>
/// This is the click handler for the 'StopMonitoring' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void StopMonitoring(object sender, RoutedEventArgs e)
{
// Stop visit monitoring.
_visitMonitor.Stop();
_visitMonitor = null;
StartMonitoringButton.IsEnabled = true;
StopMonitoringButton.IsEnabled = false;
// Clear status
_rootPage.NotifyUser("", NotifyType.StatusMessage);
}
/// <summary>
/// This is the click handler for the 'StartMonitoring' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void StartMonitoring(object sender, RoutedEventArgs e)
{
// Request permission to access location
var accessStatus = await Geolocator.RequestAccessAsync();
switch (accessStatus)
{
case GeolocationAccessStatus.Allowed:
_visitMonitor = new GeovisitMonitor();
// Add visit state changed event handler.
_visitMonitor.VisitStateChanged += OnVisitStateChanged;
// Start monitoring with the desired scope.
// For higher granularity such as building/venue level changes, choose venue.
// For lower granularity more or less in the range of zipcode level changes, choose city.
// Choosing Venue here as an example.
_visitMonitor.Start(VisitMonitoringScope.Venue);
LocationDisabledMessage.Visibility = Visibility.Collapsed;
_rootPage.NotifyUser("Waiting for update...", NotifyType.StatusMessage);
StartMonitoringButton.IsEnabled = false;
StopMonitoringButton.IsEnabled = true;
break;
case GeolocationAccessStatus.Denied:
_rootPage.NotifyUser("Access to location is denied.", NotifyType.ErrorMessage);
LocationDisabledMessage.Visibility = Visibility.Visible;
break;
default:
case GeolocationAccessStatus.Unspecified:
_rootPage.NotifyUser("Unspecificed error!", NotifyType.ErrorMessage);
LocationDisabledMessage.Visibility = Visibility.Collapsed;
break;
}
}
/// <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;
}
