private async void SegmentButtonClicked(object sender, EventArgs e)
{
// Get the segmented button control that raised the event
var buttonControl = sender as UISegmentedControl;
// Get the selected segment in the control
var selectedSegmentId = buttonControl.SelectedSegment;
// Execute the appropriate action for the control
if (selectedSegmentId == 0)
{
// Show basemap choices
ShowBasemapList();
}
else if (selectedSegmentId == 1)
{
// Create a new map
_mapViewModel.ResetMap();
}
else if (selectedSegmentId == 2)
{
// Create a challenge request for portal credentials (OAuth credential request for arcgis.com)
CredentialRequestInfo challengeRequest = new CredentialRequestInfo();
// Use the OAuth implicit grant flow
challengeRequest.GenerateTokenOptions = new GenerateTokenOptions
{
TokenAuthenticationType = TokenAuthenticationType.OAuthImplicit
};
// Indicate the url (portal) to authenticate with (ArcGIS Online)
challengeRequest.ServiceUri = new Uri("https://www.arcgis.com/sharing/rest");
// Call GetCredentialAsync on the AuthenticationManager to invoke the challenge handler
await AuthenticationManager.Current.GetCredentialAsync(challengeRequest, false);
// Show the save map UI
if (_mapInfoUI != null)
{
return;
}
// Create a view to show map item info entry controls over the map view
var ovBounds = _mapView.Bounds;
ovBounds.Height = ovBounds.Height + 60;
_mapInfoUI = new SaveMapDialogOverlay(ovBounds, 0.75f, UIColor.White, _mapView.Map.Item);
// Handle the OnMapInfoEntered event to get the info entered by the user
_mapInfoUI.OnMapInfoEntered += MapItemInfoEntered;
// Handle the cancel event when the user closes the dialog without choosing to save
_mapInfoUI.OnCanceled += SaveCanceled;
// Add the map item info UI view (will display semi-transparent over the map view)
View.Add(_mapInfoUI);
}
// Unselect all segments (user might want to click the same control twice)
buttonControl.SelectedSegment = -1;
}
// Handle the OnMapInfoEntered event from the item input UI
// MapSavedEventArgs contains the title, description, and tags that were entered
private async void MapItemInfoEntered(object sender, MapSavedEventArgs e)
{
try
{
// Get information entered by the user for the new portal item properties
var title = e.Title;
var description = e.Description;
var tags = e.Tags;
// Get the current extent
var currentViewpoint = _mapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry);
// Export the current map view for the item's thumbnail
RuntimeImage thumbnailImg = await _mapView.ExportImageAsync();
// See if the map has already been saved (has an associated portal item)
if (!_mapViewModel.MapIsSaved)
{
// Call a method on MapViewModel to save the map as a new portal item
await _mapViewModel.SaveNewMapAsync(currentViewpoint, title, description, tags, thumbnailImg);
// Report a successful save
UIAlertController alert = UIAlertController.Create("Saved map", "Saved " + title + " to ArcGIS Online", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
else
{
// Map has previously been saved as a portal item, update it (title, description, and tags will remain the same)
_mapViewModel.UpdateMapItem();
// Report success
UIAlertController alert = UIAlertController.Create("Updated map", "Saved changes to " + title, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
}
catch (Exception ex)
{
// Report save error
UIAlertController alert = UIAlertController.Create("Error", ex.Message, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
}
finally
{
// Get rid of the item input controls
if (_mapInfoUI != null)
{
_mapInfoUI.Hide();
_mapInfoUI = null;
}
}
}
private void SaveCanceled(object sender, EventArgs e)
{
// Remove the item input UI
_mapInfoUI.Hide();
_mapInfoUI = null;
}
