Feature layer rendering mode (map)

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// Copyright 2021 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 Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using UIKit;

namespace ArcGISRuntime.Samples.FeatureLayerRenderingModeMap
{
    [Register("FeatureLayerRenderingModeMap")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Feature layer rendering mode (map)",
        category: "Layers",
        description: "Render features statically or dynamically by setting the feature layer rendering mode.",
        instructions: "Tap the button to trigger the same zoom animation on both static and dynamic maps.",
        tags: new[] { "dynamic", "feature layer", "features", "rendering", "static" })]
    public class FeatureLayerRenderingModeMap : UIViewController
    {
        // Hold references to UI controls.
        private MapView _staticMapView;
        private MapView _dynamicMapView;
        private UIStackView _stackView;
        private UIBarButtonItem _zoomButton;

        // Hold references to the two views.
        private Viewpoint _zoomOutPoint;
        private Viewpoint _zoomInPoint;

        public FeatureLayerRenderingModeMap()
        {
            Title = "Feature layer rendering mode (Map)";
        }

        private async void Initialize()
        {
            // Viewpoint locations for map view to zoom in and out to.
            _zoomOutPoint = new Viewpoint(new MapPoint(-118.37, 34.46, SpatialReferences.Wgs84), 650000, 0);
            _zoomInPoint = new Viewpoint(new MapPoint(-118.45, 34.395, SpatialReferences.Wgs84), 50000, 90);

            // Configure the maps.
            _dynamicMapView.Map = new Map();
            _staticMapView.Map = new Map();

            // Create service feature table using a point, polyline, and polygon service.
            ServiceFeatureTable pointServiceFeatureTable = new ServiceFeatureTable(new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/0"));
            ServiceFeatureTable polylineServiceFeatureTable = new ServiceFeatureTable(new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/8"));
            ServiceFeatureTable polygonServiceFeatureTable = new ServiceFeatureTable(new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/9"));

            // Create feature layers from service feature tables.
            List<FeatureLayer> featureLayers = new List<FeatureLayer>
            {
                new FeatureLayer(polygonServiceFeatureTable),
                new FeatureLayer(polylineServiceFeatureTable),
                new FeatureLayer(pointServiceFeatureTable)
            };

            // Add each layer to the map as a static layer and a dynamic layer.
            foreach (FeatureLayer layer in featureLayers)
            {
                // Add the static layer to the top map view.
                layer.RenderingMode = FeatureRenderingMode.Static;
                _staticMapView.Map.OperationalLayers.Add(layer);

                // Add the dynamic layer to the bottom map view.
                if (layer.FeatureTable is ServiceFeatureTable table)
                {
                    FeatureLayer dynamicLayer = new FeatureLayer(new ServiceFeatureTable(table.Source));
                    dynamicLayer.RenderingMode = FeatureRenderingMode.Dynamic;
                    _dynamicMapView.Map.OperationalLayers.Add(dynamicLayer);
                }
            }

            try
            {
                // Set the view point of both MapViews.
                await _staticMapView.SetViewpointAsync(_zoomOutPoint);
                await _dynamicMapView.SetViewpointAsync(_zoomOutPoint);
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        private async void OnZoomClick(object sender, EventArgs e)
        {
            try
            {
                // Initiate task to zoom both map views in.
                Task t1 = _staticMapView.SetViewpointAsync(_zoomInPoint, TimeSpan.FromSeconds(5));
                Task t2 = _dynamicMapView.SetViewpointAsync(_zoomInPoint, TimeSpan.FromSeconds(5));
                await Task.WhenAll(t1, t2);

                // Delay start of next set of zoom tasks.
                await Task.Delay(2000);

                // Initiate task to zoom both map views out.
                Task t3 = _staticMapView.SetViewpointAsync(_zoomOutPoint, TimeSpan.FromSeconds(5));
                Task t4 = _dynamicMapView.SetViewpointAsync(_zoomOutPoint, TimeSpan.FromSeconds(5));
                await Task.WhenAll(t3, t4);
            }
            catch (Exception ex)
            {
                new UIAlertView("Error", ex.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 };

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

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

            _stackView = new UIStackView(new UIView[] { _staticMapView, _dynamicMapView });
            _stackView.TranslatesAutoresizingMaskIntoConstraints = false;
            _stackView.Distribution = UIStackViewDistribution.FillEqually;
            _stackView.Axis = View.TraitCollection.VerticalSizeClass == UIUserInterfaceSizeClass.Compact ? UILayoutConstraintAxis.Horizontal : UILayoutConstraintAxis.Vertical;

            _zoomButton = new UIBarButtonItem();
            _zoomButton.Title = "Zoom";

            UIToolbar toolbar = new UIToolbar();
            toolbar.TranslatesAutoresizingMaskIntoConstraints = false;
            toolbar.Items = new[]
            {
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace),
                _zoomButton,
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace)
            };

            UILabel staticLabel = new UILabel
            {
                Text = "Static",
                BackgroundColor = UIColor.FromWhiteAlpha(0f, .6f),
                TextColor = UIColor.White,
                TextAlignment = UITextAlignment.Center,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            UILabel dynamicLabel = new UILabel()
            {
                Text = "Dynamic",
                BackgroundColor = UIColor.FromWhiteAlpha(0f, .6f),
                TextColor = UIColor.White,
                TextAlignment = UITextAlignment.Center,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            // Add the views.
            View.AddSubviews(_stackView, toolbar, staticLabel, dynamicLabel);

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

                toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                toolbar.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor),

                staticLabel.TopAnchor.ConstraintEqualTo(_staticMapView.TopAnchor),
                staticLabel.HeightAnchor.ConstraintEqualTo(40),
                staticLabel.LeadingAnchor.ConstraintEqualTo(_staticMapView.LeadingAnchor),
                staticLabel.TrailingAnchor.ConstraintEqualTo(_staticMapView.TrailingAnchor),

                dynamicLabel.TopAnchor.ConstraintEqualTo(_dynamicMapView.TopAnchor),
                dynamicLabel.HeightAnchor.ConstraintEqualTo(40),
                dynamicLabel.LeadingAnchor.ConstraintEqualTo(_dynamicMapView.LeadingAnchor),
                dynamicLabel.TrailingAnchor.ConstraintEqualTo(_dynamicMapView.TrailingAnchor)
            });
        }

        public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection)
        {
            base.TraitCollectionDidChange(previousTraitCollection);
            if (View.TraitCollection.VerticalSizeClass == UIUserInterfaceSizeClass.Compact)
            {
                _stackView.Axis = UILayoutConstraintAxis.Horizontal;
            }
            else
            {
                _stackView.Axis = UILayoutConstraintAxis.Vertical;
            }
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _zoomButton.Clicked += OnZoomClick;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _zoomButton.Clicked -= OnZoomClick;
        }
    }
}