Add ENC exchange set

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// Copyright 2018 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using System;
using System.Collections.Generic;
using ArcGISRuntime;
using ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Hydrography;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.AddEncExchangeSet
{
    [Register("AddEncExchangeSet")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Add ENC exchange set",
        category: "Hydrography",
        description: "Display nautical charts per the ENC specification.",
        instructions: "Run the sample and view the ENC data. Pan and zoom around the map. Take note of the high level of detail in the data and the smooth rendering of the layer.",
        tags: new[] { "Data", "ENC", "hydrographic", "layers", "maritime", "nautical chart" })]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("9d2987a825c646468b3ce7512fb76e2d")]
    public class AddEncExchangeSet : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public AddEncExchangeSet()
        {
            Title = "Add an ENC exchange set";
        }

        private async void Initialize()
        {
            // Initialize the map with an oceans basemap.
            _myMapView.Map = new Map(BasemapStyle.ArcGISOceans);

            // Get the path to the ENC Exchange Set.
            string encPath = DataManager.GetDataFolder("9d2987a825c646468b3ce7512fb76e2d", "ExchangeSetwithoutUpdates", "ENC_ROOT", "CATALOG.031");

            // Create the Exchange Set.
            // Note: this constructor takes an array of paths because so that update sets can be loaded alongside base data.
            EncExchangeSet encExchangeSet = new EncExchangeSet(encPath);

            try
            {
                // Wait for the layer to load.
                await encExchangeSet.LoadAsync();

                // Store a list of data set extent's - will be used to zoom the mapview to the full extent of the Exchange Set.
                List<Envelope> dataSetExtents = new List<Envelope>();

                // Add each data set as a layer.
                foreach (EncDataset encDataSet in encExchangeSet.Datasets)
                {
                    EncLayer encLayer = new EncLayer(new EncCell(encDataSet));

                    // Add the layer to the map.
                    _myMapView.Map.OperationalLayers.Add(encLayer);

                    // Wait for the layer to load.
                    await encLayer.LoadAsync();

                    // Add the extent to the list of extents.
                    dataSetExtents.Add(encLayer.FullExtent);
                }

                // Use the geometry engine to compute the full extent of the ENC Exchange Set.
                Envelope fullExtent = GeometryEngine.CombineExtents(dataSetExtents);

                // Set the viewpoint.
                await _myMapView.SetViewpointAsync(new Viewpoint(fullExtent));
            }
            catch (Exception e)
            {
                new UIAlertView("Error", e.ToString(), (IUIAlertViewDelegate) null, "OK", null).Show();
            }
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            // Add the views.
            View.AddSubview(_myMapView);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }
    }
}