protected override void OnDestroy()
{
base.OnDestroy();
// Restore API key if leaving sample.
ApiKeyManager.EnableKey();
}
private async Task SelectSample(SampleInfo selectedSample)
{
// The following code removes the API key when using the Create and save map sample.
if (nameof(SampleManager.Current.SelectedSample) != nameof(selectedSample))
{
// Remove API key if opening Create and save map sample.
if (selectedSample.FormalName == "AuthorMap")
{
ApiKeyManager.DisableKey();
}
// Restore API key if leaving Create and save map sample.
else if (SampleManager.Current?.SelectedSample?.FormalName == "AuthorMap")
{
ApiKeyManager.EnableKey();
}
}
// Call a function to clear existing credentials
ClearCredentials();
SampleManager.Current.SelectedSample = selectedSample;
try
{
if (selectedSample.OfflineDataItems != null)
{
CancellationTokenSource cancellationSource = new CancellationTokenSource();
// Show the waiting page
SamplePageContainer.Content = new WaitPage(cancellationSource);
SamplePageContainer.Visibility = Visibility.Visible;
SampleSelectionGrid.Visibility = Visibility.Collapsed;
// Wait for offline data to complete
await DataManager.EnsureSampleDataPresent(selectedSample, cancellationSource.Token);
}
// Show the sample
SamplePageContainer.Content = new SamplePage();
SamplePageContainer.Visibility = Visibility.Visible;
SampleSelectionGrid.Visibility = Visibility.Collapsed;
}
catch (Exception exception)
{
// Failed to create new instance of the sample.
SamplePageContainer.Visibility = Visibility.Collapsed;
SampleSelectionGrid.Visibility = Visibility.Visible;
CategoriesTree.SelectionMode = muxc.TreeViewSelectionMode.None;
await new MessageDialog2(exception.Message).ShowAsync();
CategoriesTree.SelectionMode = muxc.TreeViewSelectionMode.Single;
}
}
public override void ViewDidDisappear(bool animated)
{
base.ViewDidDisappear(animated);
// Unsubscribe from events, per best practice.
_newMapButton.Clicked -= NewMapClicked;
_basemapButton.Clicked -= ShowBasemapClicked;
_layersButton.Clicked -= ShowLayerListClicked;
_saveButton.Clicked -= SaveMapClicked;
// Restore API key if leaving Create and save map sample.
ApiKeyManager.EnableKey();
}
private async void OnItemTapped(object sender, ItemTappedEventArgs e)
{
// Call a function to clear existing credentials.
ClearCredentials();
try
{
// Get the selected sample.
SampleInfo item = (SampleInfo)e.Item;
if (item.FormalName == "AuthorMap")
{
// Remove API key if opening Create and save map sample.
ApiKeyManager.DisableKey();
}
else
{
// Ensure API key is set in ArcGIS Runtime environment.
ApiKeyManager.EnableKey();
}
// Load offline data before showing the sample.
if (item.OfflineDataItems != null)
{
CancellationTokenSource cancellationSource = new CancellationTokenSource();
// Show the wait page.
await Navigation.PushModalAsync(new WaitPage(cancellationSource) { Title = item.SampleName }, false);
#if WINDOWS_UWP
// Workaround for bug with Xamarin Forms UWP.
await Task.WhenAll(
Task.Delay(100),
DataManager.EnsureSampleDataPresent(item, cancellationSource.Token)
);
#else
// Wait for the sample data download.
await DataManager.EnsureSampleDataPresent(item, cancellationSource.Token);
#endif
// Remove the waiting page.
await Navigation.PopModalAsync(false);
}
// Get the sample control from the selected sample.
ContentPage sampleControl = (ContentPage)SampleManager.Current.SampleToControl(item);
// Create the sample display page to show the sample and the metadata.
SamplePage page = new SamplePage(sampleControl, item);
// Show the sample.
await Navigation.PushAsync(page, true);
}
catch (OperationCanceledException)
{
// Remove the waiting page.
await Navigation.PopModalAsync(false);
await Application.Current.MainPage.DisplayAlert("", "Download cancelled", "OK");
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Exception occurred on OnItemTapped. Exception = " + ex);
}
}
private async Task SelectSample(SampleInfo selectedSample)
{
if (selectedSample == null)
{
return;
}
// The following code removes the API key when using the Create and save map sample.
if (nameof(SampleManager.Current.SelectedSample) != nameof(selectedSample))
{
// Remove API key if opening Create and save map sample.
if (selectedSample.FormalName == "AuthorMap")
{
ApiKeyManager.DisableKey();
}
// Restore API key if leaving Create and save map sample.
else if (SampleManager.Current?.SelectedSample?.FormalName == "AuthorMap")
{
ApiKeyManager.EnableKey();
}
}
SampleTitleBlock.Text = selectedSample.SampleName;
SampleManager.Current.SelectedSample = selectedSample;
DescriptionContainer.SetSample(selectedSample);
ShowSampleTab();
// Call a function to clear any existing credentials from AuthenticationManager
ClearCredentials();
try
{
if (selectedSample.OfflineDataItems != null)
{
CancellationTokenSource cancellationSource = new CancellationTokenSource();
// Show waiting page
SampleContainer.Content = new WPF.Viewer.WaitPage(cancellationSource);
// Wait for offline data to complete
await DataManager.EnsureSampleDataPresent(selectedSample, cancellationSource.Token);
}
// Show the sample
SampleContainer.Content = SampleManager.Current.SampleToControl(selectedSample);
SourceCodeContainer.LoadSourceCode();
}
catch (OperationCanceledException)
{
CategoriesRegion.Visibility = Visibility.Visible;
SampleContainer.Visibility = Visibility.Collapsed;
return;
}
catch (Exception exception)
{
// failed to create new instance of the sample
SampleContainer.Content = new WPF.Viewer.ErrorPage(exception);
}
CategoriesRegion.Visibility = Visibility.Collapsed;
SampleContainer.Visibility = Visibility.Visible;
}