Map image layer sublayer visibility

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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.map_image_layer_sublayer_visibility;

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.CheckBox;
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.SublayerList;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

public class MapImageLayerSublayerVisibilitySample extends Application {

  private MapView mapView;

  @Override
  public void start(Stage stage) {

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

      // size the stage and add a title
      stage.setTitle("Map Image Layer Sublayer Visibility 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 control panel
      VBox controlsVBox = new VBox(6);
      controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.3)"), CornerRadii.EMPTY,
              Insets.EMPTY)));
      controlsVBox.setPadding(new Insets(10.0));
      controlsVBox.setMaxSize(180, 130);
      controlsVBox.getStyleClass().add("panel-region");

      // create checkboxes for each sublayer
      CheckBox citiesBox = new CheckBox("Cities");
      CheckBox continentsBox = new CheckBox("Continents");
      CheckBox worldBox = new CheckBox("World");

      controlsVBox.getChildren().addAll(citiesBox, continentsBox, worldBox);
      controlsVBox.getChildren().forEach(c -> ((CheckBox) c).setSelected(true));

      // 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(48.354406, -99.998267, 147914382));

      // create an image Layer with dynamically generated ArcGISMap images
      ArcGISMapImageLayer imageLayer = new ArcGISMapImageLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer");

      // add the image layer to the map's operational layers
      map.getOperationalLayers().add(imageLayer);

      // set the image layer's opacity so that the basemap is visible behind it
      imageLayer.setOpacity(0.7f);

      // show alert if layer fails to load
      imageLayer.addDoneLoadingListener(() -> {
        if (imageLayer.getLoadStatus() == LoadStatus.LOADED) {

          // get the layers from the ArcGISMap image layer
          SublayerList layers = imageLayer.getSublayers();

          // handle sub layer selection
          citiesBox.selectedProperty().addListener(e -> layers.get(0).setVisible(citiesBox.isSelected()));
          continentsBox.selectedProperty().addListener(e -> layers.get(1).setVisible(continentsBox.isSelected()));
          worldBox.selectedProperty().addListener(e -> layers.get(2).setVisible(worldBox.isSelected()));

        } else {
          new Alert(Alert.AlertType.ERROR, "Error loading Image Layer.").show();
        }
      });

      // add the map view and controls to the 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();
    }
  }

  @Override
  public void stop() {

    // releases resources when the application closes
    if (mapView != null) {
      mapView.dispose();
    }
  }

  /**
   * Starting point of this application.
   *
   * @param args arguments to this application.
   */
  public static void main(String[] args) {

    Application.launch(args);
  }
}