public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
// Call the function that creates the UI
CreateLayout();
// Set up AuthenticationManager
UpdateAuthenticationManager();
// Use the map from the view-model
_mapViewModel.ResetMap();
}
public override void ViewDidLoad()
{
// Called on initial page load
base.ViewDidLoad();
// Call the function that creates the UI
CreateLayout();
// Set up the AuthenticationManager
UpdateAuthenticationManager();
// Use the map from the view-model
_mapViewModel.ResetMap();
}
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;
}
public AuthorEditSaveMap()
{
InitializeComponent();
// Get the view model (defined as a resource in the XAML)
_mapViewModel = this.Resources["MapViewModel"] as MapViewModel;
// Pass the map view to the map view model
_mapViewModel.AppMapView = MyMapView;
// Define a click handler for the Basemaps button (show the basemap choice list)
BasemapsButton.Clicked += (s, e) => BasemapListBox.IsVisible = true;
// Define a selection handler on the basemap list
BasemapListBox.ItemTapped += OnBasemapsClicked;
// Define a click handler for the Save button (show a form for entering portal item info)
SaveMapButton.Clicked += ShowSaveMapDialog;
// Define a click handler for the New button
NewMapButton.Clicked += (s, e) => {
_mapViewModel.ResetMap();
BasemapListBox.SelectedItem = _mapViewModel.BasemapChoices[0];
};
// Set up the AuthenticationManager to challenge for ArcGIS Online credentials
UpdateAuthenticationManager();
// Change the style of the basemap list view for Android and UWP
Device.OnPlatform(
Android: () =>
{
// Black background on Android (transparent by default)
BasemapListBox.BackgroundColor = Color.Black;
},
WinPhone: () =>
{
// Semi-transparent background on Windows with a small margin around the control
BasemapListBox.BackgroundColor = Color.FromRgba(255, 255, 255, 0.3);
BasemapListBox.Margin = new Thickness(50);
});
Title = "Author, edit, and save maps to your portal";
}
private void OnNewMapClicked(object sender, EventArgs e)
{
_mapViewModel.ResetMap();
}