private async void Initialize()
{
// Create the US states feature table.
_usStatesTable = new ServiceFeatureTable(_usStatesServiceUri);
try
{
// Load the table.
await _usStatesTable.LoadAsync();
// Fill the fields combo and "group by" list with field names from the table.
_fieldNames = _usStatesTable.Fields.Select(field => field.Name).ToList();
// Create a model that will provide statistic definition choices for the picker.
_statsPickerModel = new StatDefinitionModel(_fieldNames.ToArray());
// Create a list of fields the user can select for grouping.
// Value is initially false, since no fields are selected by default.
_groupByFields = _fieldNames.ToDictionary(name => name, name => false);
}
catch (Exception e)
{
new UIAlertView("Error", e.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
// Constructor that takes a picker for defining new statistics.
public ChooseStatisticOverlay(CGRect frame, nfloat transparency, UIColor color, UIPickerView statPicker) : base(frame)
{
// Store the statistics picker.
UIPickerView statisticPicker = statPicker;
// Create a semi-transparent overlay with the specified background color.
BackgroundColor = color;
Alpha = transparency;
// Set the total height and width of the control set.
nfloat totalHeight = 400;
nfloat totalWidth = 320;
// Find the bottom x and y of the view.
nfloat centerX = Frame.Width / 2;
nfloat centerY = Frame.Bottom - 40;
// Find the start x and y for the control layout (aligned to the bottom of the view).
nfloat controlX = centerX - totalWidth / 2;
nfloat controlY = centerY - totalHeight;
// Toolbar with "Add" and "Done" buttons.
UIToolbar toolbar = new UIToolbar
{
BarStyle = UIBarStyle.Black,
Translucent = false
};
toolbar.SizeToFit();
// Add Button (add the new stat and don't dismiss the UI).
UIBarButtonItem addButton = new UIBarButtonItem("Add", UIBarButtonItemStyle.Done, (s, e) =>
{
// Get the selected StatisticDefinition.
StatDefinitionModel statPickerModel = (StatDefinitionModel)statisticPicker.Model;
StatisticDefinition newStatDefinition = statPickerModel.SelectedStatDefinition;
if (newStatDefinition != null)
{
// Fire the OnMapInfoEntered event and provide the statistic definition.
OnStatisticDefined?.Invoke(this, newStatDefinition);
}
});
// Done Button (dismiss the UI, don't use the selected statistic).
UIBarButtonItem doneButton = new UIBarButtonItem("Done", UIBarButtonItemStyle.Plain,
(s, e) => { OnCanceled?.Invoke(this, null); });
// Add the buttons to the toolbar.
toolbar.SetItems(new[] { addButton, doneButton }, true);
// Define the location of the statistic picker.
controlY = controlY + 200;
statisticPicker.Frame = new CGRect(controlX, controlY, totalWidth, 200);
// Set the location for the toolbar.
controlY = controlY + 220;
toolbar.Frame = new CGRect(controlX, controlY, totalWidth, 30);
// Add the controls.
AddSubviews(toolbar, statisticPicker);
}
