private async void Initialize()
{
// Create the US states feature table
_usStatesTable = new ServiceFeatureTable(_usStatesServiceUri);
// 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);
}
// 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
_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();
toolbar.BarStyle = UIBarStyle.Black;
toolbar.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 = _statisticPicker.Model as StatDefinitionModel;
StatisticDefinition newStatDefinition = statPickerModel.SelectedStatDefinition;
if (newStatDefinition != null)
{
// Fire the OnMapInfoEntered event and provide the statistic definition
if (OnStatisticDefined != null)
{
// Raise the event
OnStatisticDefined(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 UIBarButtonItem[] { 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);
}
