Manage operational layers

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/*
 * Copyright 2017 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.
 */

package com.esri.samples.manage_operational_layers;

import java.util.ArrayList;
import java.util.Arrays;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.layers.ArcGISMapImageLayer;
import com.esri.arcgisruntime.layers.Layer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.LayerList;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

public class ManageOperationalLayersSample extends Application {

  private MapView mapView;

  @Override
  public void start(Stage stage) {

    try {
      // create the stack pane and the application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);
      scene.getStylesheets().add(getClass().getResource("/manage_operational_layers/style.css").toExternalForm());

      // set a title, size, and add the scene to the stage
      stage.setTitle("Manage Operational Layers Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // authentication with an API key or named user is required to access basemaps and other location services
      String yourAPIKey = System.getProperty("apiKey");
      ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);

      // create a map with the topographic basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

      // create a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);

      // set a viewpoint on the map view
      mapView.setViewpoint(new Viewpoint(41.056295, -106.195800, 50000000));

      // create and add new image layers to the map's operational layers
      LayerList mapLayers = map.getOperationalLayers();
      mapLayers.addAll(Arrays.asList(
        (new ArcGISMapImageLayer("https://sampleserver5.arcgisonline.com/arcgis/rest/services/Elevation/WorldElevations/MapServer")),
        (new ArcGISMapImageLayer("https://sampleserver5.arcgisonline.com/arcgis/rest/services/DamageAssessment/MapServer")),
        (new ArcGISMapImageLayer("https://sampleserver5.arcgisonline.com/arcgis/rest/services/Census/MapServer"))
      ));

      // check that each layer has loaded correctly and if not display an error message
      mapLayers.forEach(layer ->
        layer.addDoneLoadingListener(() -> {
          if (layer.getLoadStatus() != LoadStatus.LOADED) {
            new Alert(Alert.AlertType.ERROR, "Map image layer failed to load: " + layer.getLoadError().getCause().getMessage()).show();
          }
        })
      );

      // create a list to hold deleted layers
      ArrayList<Layer> deletedLayers = new ArrayList<>();

      // create a list view to display the list of added and deleted layers by name, and create labels for them
      ListView<String> addedLayerNamesList = new ListView<>();
      Label addedLayersLabel = new Label("Added layers");
      ListView<String> deletedLayerNamesList = new ListView<>();
      Label deletedLayersLabel = new Label("Deleted layers");

      // add the names of the layers on the map to the list of added layers
      // note this should be the reverse order they were added to the map
      addedLayerNamesList.getItems().add(mapLayers.get(2).getName());
      addedLayerNamesList.getItems().add(mapLayers.get(1).getName());
      addedLayerNamesList.getItems().add(mapLayers.get(0).getName());

      // create a listener for clicks on the list of added layers
      addedLayerNamesList.setOnMouseClicked(e -> {

        // if there are added layers
        if (!mapLayers.isEmpty() && !addedLayerNamesList.getItems().isEmpty()) {

          // get the index of the selected item
          int selectedIndex = addedLayerNamesList.getSelectionModel().getSelectedIndex();

          // if a valid index is selected
          if (selectedIndex >= 0) {

            // get the selected layer from the map and its index in the list of operational layers on the map
            ArcGISMapImageLayer selectedLayer = (ArcGISMapImageLayer) mapLayers.get(mapLayers.size() - selectedIndex - 1);
            int indexOfSelectedLayer = mapLayers.indexOf(selectedLayer);

            if (e.getButton() == MouseButton.PRIMARY) {

              // if the layer is not already at the top, move it to the top of the list and layers on the map
              if (selectedIndex != 0) {

                // move the layer's name to the top of the added layers list. Note this is adding to index 0.
                addedLayerNamesList.getItems().remove(selectedIndex);
                addedLayerNamesList.getItems().add(0, selectedLayer.getName());

                // move the layer to the top of the layers on the map. Note this is adding to the last index.
                mapLayers.remove(indexOfSelectedLayer);
                mapLayers.add(mapLayers.size(), selectedLayer);

                // update the UI to keep the current layer selected
                addedLayerNamesList.getSelectionModel().select(0);
              }

            } else if (e.getButton() == MouseButton.SECONDARY) {

              // remove the selected layer from the map and add it to the deleted layers
              mapLayers.remove(selectedLayer);
              deletedLayers.add(selectedLayer);

              // remove the selected layer's name from the added layers list and add it to the deleted layers list
              addedLayerNamesList.getItems().remove(selectedIndex);
              deletedLayerNamesList.getItems().add(selectedLayer.getName());
            }
          }
        }
      });

      // create a listener for clicks on the list of deleted layers
      deletedLayerNamesList.setOnMouseClicked(e -> {

        // if there are deleted layers
        if (!deletedLayers.isEmpty() && !deletedLayerNamesList.getItems().isEmpty()) {

          // get the index of the selected layer
          int selectedIndex = deletedLayerNamesList.getSelectionModel().getSelectedIndex();

          // if a valid index is selected
          if (selectedIndex >= 0) {

            if (e.getButton() == MouseButton.SECONDARY) {

              // add the layer to the map and remove from the deleted layers
              mapLayers.add(0, deletedLayers.get(selectedIndex));
              deletedLayers.remove(selectedIndex);

              // add the selected layer's name to the added layers list and remove it from the deleted layers list
              addedLayerNamesList.getItems().add(deletedLayerNamesList.getSelectionModel().getSelectedItem());
              deletedLayerNamesList.getItems().remove(selectedIndex);
            }
          }
        }
      });

      // create a control panel and add the label and list UI components
      VBox controlsVBox = new VBox(6);
      controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.3)"), CornerRadii.EMPTY,
        Insets.EMPTY)));
      controlsVBox.getStyleClass().add("panel-region");
      controlsVBox.setPadding(new Insets(10.0));
      controlsVBox.setMaxWidth(200);
      controlsVBox.setMaxHeight(260);
      controlsVBox.getChildren().addAll(addedLayersLabel, addedLayerNamesList, deletedLayersLabel, deletedLayerNamesList);

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, controlsVBox);
      StackPane.setAlignment(controlsVBox, Pos.TOP_LEFT);
      StackPane.setMargin(controlsVBox, new Insets(10, 0, 0, 10));
    } catch (Exception e) {
      // on any error, display the stack trace
      e.printStackTrace();
    }
  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

    if (mapView != null) {
      mapView.dispose();
    }
  }

  /**
   * Opens and runs application.
   *
   * @param args arguments passed to this application
   */
  public static void main(String[] args) {

    Application.launch(args);
  }
}