Edit features with feature-linked annotation

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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
// 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 Android.App;
using Android.Graphics;
using Android.OS;
using Android.Views;
using Android.Widget;
using ArcGISRuntime;
using ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace ArcGISRuntimeXamarin.Samples.EditFeatureLinkedAnnotation
{
    [Activity(ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Edit features with feature-linked annotation",
        category: "Data",
        description: "Edit feature attributes which are linked to annotation through an expression.",
        instructions: "Pan and zoom the map to see that the text on the map is annotation, not labels. Tap one of the address points to update the house number (AD_ADDRESS) and street name (ST_STR_NAM). Tap one of the dashed parcel polylines and tap another location to change its geometry. NOTE: Selection is only enabled for points and straight (single segment) polylines.",
        tags: new[] { "annotation", "attributes", "feature-linked annotation", "features", "fields" })]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("74c0c9fa80f4498c9739cc42531e9948")]
    [ArcGISRuntime.Samples.Shared.Attributes.AndroidLayout("EditAttributeLayout.xml")]
    public class EditFeatureLinkedAnnotation : Activity
    {
        // Hold references to the UI controls.
        private MapView _myMapView;

        private Feature _selectedFeature;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Edit features with feature-linked annotation";

            CreateLayout();
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // NOTE: to be a writable geodatabase, this geodatabase must be generated from a service with a GeodatabaseSyncTask. See the "Generate geodatabase" sample.
            try
            {
                // Create and load geodatabase.
                string geodatabasePath = DataManager.GetDataFolder("74c0c9fa80f4498c9739cc42531e9948", "loudoun_anno.geodatabase");
                Geodatabase geodatabase = await Geodatabase.OpenAsync(geodatabasePath);

                // Create feature layers from tables in the geodatabase.
                FeatureLayer addressFeatureLayer = new FeatureLayer(geodatabase.GetGeodatabaseFeatureTable("Loudoun_Address_Points_1"));
                FeatureLayer parcelFeatureLayer = new FeatureLayer(geodatabase.GetGeodatabaseFeatureTable("ParcelLines_1"));

                // Create annotation layers from tables in the geodatabase.
                AnnotationLayer addressAnnotationLayer = new AnnotationLayer(geodatabase.GetGeodatabaseAnnotationTable("Loudoun_Address_PointsAnno_1"));
                AnnotationLayer parcelAnnotationLayer = new AnnotationLayer(geodatabase.GetGeodatabaseAnnotationTable("ParcelLinesAnno_1"));

                // Create a map with the layers.
                _myMapView.Map = new Map(BasemapStyle.ArcGISLightGray);
                _myMapView.Map.OperationalLayers.AddRange(new List<Layer> { addressFeatureLayer, parcelFeatureLayer, addressAnnotationLayer, parcelAnnotationLayer });

                // Zoom to the extent of the parcels.
                await parcelFeatureLayer.LoadAsync();
                _myMapView.SetViewpoint(new Viewpoint(parcelFeatureLayer.FullExtent));
            }
            catch (Exception ex)
            {
                new AlertDialog.Builder(this).SetMessage(ex.Message).SetTitle(ex.GetType().Name).Show();
            }
        }

        private void MapViewTapped(object sender, GeoViewInputEventArgs e)
        {
            // Check if there is already a selected feature.
            if (_selectedFeature == null)
            {
                _ = SelectFeature(e.Position);
            }
            else
            {
                // Project the user selected point.
                MapPoint projPoint = GeometryEngine.Project(e.Location, _selectedFeature.Geometry.SpatialReference) as MapPoint;

                // Update the geometry of the selected feature.
                _ = UpdateGeometry(projPoint);
            }
        }

        private async Task SelectFeature(PointF clickedPoint)
        {
            try
            {
                // Identify across all layers.
                IReadOnlyList<IdentifyLayerResult> identifyResults = await _myMapView.IdentifyLayersAsync(clickedPoint, 10.0, false);
                foreach (IdentifyLayerResult result in identifyResults)
                {
                    if (result.LayerContent is FeatureLayer layer)
                    {
                        _selectedFeature = result.GeoElements.First() as Feature;
                        if (_selectedFeature.Geometry is Polyline line)
                        {
                            // No support for curved lines.
                            if (line.Parts.Count > 1)
                            {
                                _selectedFeature = null;
                                return;
                            }
                        }
                        else if (_selectedFeature.Geometry is MapPoint)
                        {
                            // Open attribute editor for point features.
                            ShowEditableAttributes();
                        }

                        // Select the feature.
                        layer.SelectFeature(_selectedFeature);
                        break;
                    }
                }
            }
            catch (Exception ex)
            {
                new AlertDialog.Builder(this).SetMessage(ex.Message).SetTitle(ex.GetType().Name).Show();
            }
        }

        private async Task UpdateGeometry(MapPoint point)
        {
            if (_selectedFeature.Geometry is Polyline line)
            {
                // Get the nearest point on the selected line.
                ProximityResult nearestVertex = GeometryEngine.NearestVertex(line, point);

                // Create a new polyline.
                PolylineBuilder polylineBuilder = new PolylineBuilder(line);
                Part part = polylineBuilder.Parts[nearestVertex.PartIndex];

                // Replace the nearest point with the new point.
                part.SetPoint(nearestVertex.PointIndex, point);

                // Update the geometry of the feature.
                _selectedFeature.Geometry = GeometryEngine.Project(polylineBuilder.ToGeometry(), _selectedFeature.Geometry.SpatialReference);
                await _selectedFeature.FeatureTable.UpdateFeatureAsync(_selectedFeature);
            }
            else if (_selectedFeature.Geometry is MapPoint)
            {
                // Update the geometry of the feature.
                _selectedFeature.Geometry = point;
                await _selectedFeature.FeatureTable.UpdateFeatureAsync(_selectedFeature);
            }

            // Clear the selection.
            (_selectedFeature.FeatureTable.Layer as FeatureLayer).ClearSelection();
            _selectedFeature = null;
        }

        private void ShowEditableAttributes()
        {
            // Create the view for the editing UI.
            Android.Views.View editAttributesView = LayoutInflater.Inflate(Resource.Layout.EditAttributeLayout, null);

            // Create an alert dialog.
            AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
            dialogBuilder.SetTitle("Edit feature attributes");
            dialogBuilder.SetView(editAttributesView);
            EditText addressText = editAttributesView.FindViewById<EditText>(Resource.Id.addressNumberEditText);
            EditText streetText = editAttributesView.FindViewById<EditText>(Resource.Id.streetEditText);

            // Populate entry fields with data from feature.
            addressText.Text = _selectedFeature.Attributes["AD_ADDRESS"].ToString();
            streetText.Text = _selectedFeature.Attributes["ST_STR_NAM"].ToString();

            // Add buttons to finish the dialog
            dialogBuilder.SetNegativeButton("Cancel", (s, e) => { });
            dialogBuilder.SetPositiveButton("Ok", async (s, e) =>
            {
                try
                {
                    // Update the feature attributes with the user input.
                    _selectedFeature.Attributes["AD_ADDRESS"] = int.Parse(addressText.Text);
                    _selectedFeature.Attributes["ST_STR_NAM"] = streetText.Text;
                    await _selectedFeature.FeatureTable.UpdateFeatureAsync(_selectedFeature);
                }
                catch (Exception ex)
                {
                    new AlertDialog.Builder(this).SetMessage(ex.Message).SetTitle(ex.GetType().Name).Show();
                }
            });

            dialogBuilder.Show();
        }

        private void CreateLayout()
        {
            // Create a new vertical layout for the app.
            var layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Create the help label.
            TextView helpLabel = new TextView(this);
            helpLabel.Text = "1. Tap to select a feature.\n2. For MapPoint features, edit the feature attributes.\n3. Tap again to move the feature.";
            helpLabel.TextAlignment = TextAlignment.TextStart;
            helpLabel.Gravity = GravityFlags.Center;

            // Add the help label to the layout.
            layout.AddView(helpLabel);

            // Add the map view to the layout.
            _myMapView = new MapView(this);
            layout.AddView(_myMapView);

            // Show the layout in the app.
            SetContentView(layout);

            // Add an event handler for the map view.
            _myMapView.GeoViewTapped += MapViewTapped;
        }

        protected override void OnDestroy()
        {
            base.OnDestroy();

            // Unhook the event handler.
            _myMapView.GeoViewTapped -= MapViewTapped;
        }
    }
}