Display KML network links

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
// 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 ArcGISRuntime;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Ogc;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.DisplayKmlNetworkLinks
{
    [Register("DisplayKmlNetworkLinks")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Display KML network links",
        category: "Layers",
        description: "Display a file with a KML network link, including displaying any network link control messages at launch.",
        instructions: "The sample will load the KML file automatically. The data shown should refresh automatically every few seconds. Pan and zoom to explore the map.",
        tags: new[] { "KML", "KMZ", "Keyhole", "Network Link", "Network Link Control", "OGC" })]
    public class DisplayKmlNetworkLinks : UIViewController
    {
        // Hold references to UI controls.
        private SceneView _mySceneView;

        // Hold a reference to the KML data set.
        private KmlDataset _dataset;

        public DisplayKmlNetworkLinks()
        {
            Title = "Display KML network links";
        }

        private void Initialize()
        {
            // Set up the basemap.
            _mySceneView.Scene = new Scene(BasemapStyle.ArcGISImagery);

            // Create the dataset.
            _dataset = new KmlDataset(new Uri("https://www.arcgis.com/sharing/rest/content/items/600748d4464442288f6db8a4ba27dc95/data"));

            // Listen for network link control messages.
            // These should be shown to the user.
            _dataset.NetworkLinkControlMessage += Dataset_NetworkLinkControlMessage;

            // Create the layer from the dataset.
            KmlLayer fileLayer = new KmlLayer(_dataset);

            // Add the layer to the map.
            _mySceneView.Scene.OperationalLayers.Add(fileLayer);

            // Zoom in to center the map on Germany.
            _mySceneView.SetViewpoint(new Viewpoint(new MapPoint(8.150526, 50.472421, SpatialReferences.Wgs84), 20000000));
        }

        private void Dataset_NetworkLinkControlMessage(object sender, KmlNetworkLinkControlMessageEventArgs e)
        {
            // Due to the nature of the threading implementation,
            //     the dispatcher needs to be used to interact with the UI.
            // The dispatcher takes an Action, provided here as a lambda function.
            InvokeOnMainThread(() =>
            {
                // Display the message to the user.
                UIAlertView alertView = new UIAlertView("KML layer message", e.Message, (IUIAlertViewDelegate) null, "OK", null);
                alertView.Show();
            });
        }

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

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

            _mySceneView = new SceneView();
            _mySceneView.TranslatesAutoresizingMaskIntoConstraints = false;

            // Add the views.
            View.AddSubviews(_mySceneView);

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

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

            // Subscribe to events, removing any existing subscriptions.
            if (_dataset != null)
            {
                _dataset.NetworkLinkControlMessage -= Dataset_NetworkLinkControlMessage;
                _dataset.NetworkLinkControlMessage += Dataset_NetworkLinkControlMessage;
            }
        }

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

            // Unsubscribe from events, per best practice.
            if (_dataset != null) _dataset.NetworkLinkControlMessage -= Dataset_NetworkLinkControlMessage;
        }
    }
}