Manage operational layers

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 // Copyright 2022 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.Mapping;  namespace ArcGIS.Samples.ManageOperationalLayers {  [ArcGIS.Samples.Shared.Attributes.Sample(  name: "Manage operational layers",  category: "Map",  description: "Add, remove, and reorder operational layers in a map.",  instructions: "When the app starts, a list displays the operational layers that are currently displayed in the map. Right-tap on the list item to remove the layer, or left-tap to move it to the top. The map will be updated automatically.",  tags: new[] { "add", "delete", "layer", "map", "remove" })]  public partial class ManageOperationalLayers : ContentPage  {  private MapViewModel _viewModel;   // Some URLs of layers to add to the map.  private readonly string[] _layerUrls = new[]  {  "https://sampleserver5.arcgisonline.com/arcgis/rest/services/Elevation/WorldElevations/MapServer",  "https://sampleserver5.arcgisonline.com/arcgis/rest/services/Census/MapServer",  "https://sampleserver5.arcgisonline.com/arcgis/rest/services/DamageAssessment/MapServer"  };   public ManageOperationalLayers()  {  InitializeComponent();  Initialize();  }   private void Initialize()  {  // Set up the view model and bindings.  _viewModel = new MapViewModel(new Map(BasemapStyle.ArcGISStreets));  MyMapView.Map = _viewModel.Map;  IncludedListView.ItemsSource = _viewModel.IncludedLayers;  ExcludedListView.ItemsSource = _viewModel.ExcludedLayers;   // Add the layers.  foreach (string layerUrl in _layerUrls)  {  _viewModel.AddLayerFromUrl(layerUrl);  }  }   private void MoveButton_OnClicked(object sender, EventArgs e)  {  try  {  // Get the clicked button.  Button clickedButton = (Button)sender;   // Get the clicked layer.  Layer clickedLayer = (Layer)clickedButton.BindingContext;   // Move the layer.  _viewModel.MoveLayer(clickedLayer);  }  // Sometimes if the user clicks too quickly NREs will occur.  catch (Exception exception)  {  Console.WriteLine(exception);  }  }   private void PromoteButton_Clicked(object sender, EventArgs e)  {  try  {  // Get the clicked button.  Button clickedButton = (Button)sender;   // Get the clicked layer.  Layer clickedLayer = (Layer)clickedButton.BindingContext;   // Move the layer.  _viewModel.PromoteLayer(clickedLayer);  }  // Sometimes if the user clicks too quickly NREs will occur.  catch (Exception exception)  {  Console.WriteLine(exception);  }  }   private void DemoteButton_Clicked(object sender, EventArgs e)  {  try  {  // Get the clicked button.  Button clickedButton = (Button)sender;   // Get the clicked layer.  Layer clickedLayer = (Layer)clickedButton.BindingContext;   // Move the layer.  _viewModel.DemoteLayer(clickedLayer);  }  // Sometimes if the user clicks too quickly NREs will occur.  catch (Exception exception)  {  Console.WriteLine(exception);  }  }  }   internal class MapViewModel  {  public Map Map { get; }  public LayerCollection IncludedLayers => Map.OperationalLayers;  public LayerCollection ExcludedLayers { get; } = new LayerCollection();   public MapViewModel(Map map)  {  Map = map;  }   public void AddLayerFromUrl(string layerUrl)  {  ArcGISMapImageLayer layer = new ArcGISMapImageLayer(new Uri(layerUrl));  Map.OperationalLayers.Add(layer);  }   public void PromoteLayer(Layer selectedLayer)  {  // Find the collection the layer is in.  LayerCollection owningCollection;  if (IncludedLayers.Contains(selectedLayer))  {  owningCollection = IncludedLayers;  }  else  {  owningCollection = ExcludedLayers;  }   // Get the current index (position) of the layer.  int layerIndex = owningCollection.IndexOf(selectedLayer);   // Skip if the layer can't be moved down because it is already at the bottom.  if (layerIndex == owningCollection.Count - 1)  {  return;  }   // Move the layer by removing it and re-adding it at its old position plus 1.  owningCollection.Remove(selectedLayer);  owningCollection.Insert(layerIndex + 1, selectedLayer);  }   public void DemoteLayer(Layer selectedLayer)  {  // Find the collection the layer is in.  LayerCollection owningCollection = IncludedLayers.Contains(selectedLayer) ? IncludedLayers : ExcludedLayers;   // Get the current index (position) of the layer.  int layerIndex = owningCollection.IndexOf(selectedLayer);   // Skip if the layer can't be moved because it is already at the top.  if (layerIndex < 1)  {  return;  }   // Move the layer by removing it and re-adding it at its old position minus 1.  owningCollection.Remove(selectedLayer);  owningCollection.Insert(layerIndex - 1, selectedLayer);  }   public void MoveLayer(Layer selectedLayer)  {  // Remove the layer from the list it is currently in and add it to the other list.  if (IncludedLayers.Contains(selectedLayer))  {  IncludedLayers.Remove(selectedLayer);  ExcludedLayers.Add(selectedLayer);  }  else  {  ExcludedLayers.Remove(selectedLayer);  IncludedLayers.Add(selectedLayer);  }  }  } }