Read symbols from a mobile style file

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/*
 * Copyright 2019 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.read_symbols_from_mobile_style_file;

import java.io.File;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutionException;

import javafx.beans.value.ChangeListener;
import javafx.fxml.FXML;
import javafx.geometry.Point2D;
import javafx.scene.control.Alert;
import javafx.scene.control.ColorPicker;
import javafx.scene.control.ListView;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.MultilayerPointSymbol;
import com.esri.arcgisruntime.symbology.Symbol;
import com.esri.arcgisruntime.symbology.SymbolStyle;
import com.esri.arcgisruntime.symbology.SymbolStyleSearchParameters;
import com.esri.arcgisruntime.symbology.SymbolStyleSearchResult;

public class ReadSymbolsFromMobileStyleFileController {

  @FXML private MapView mapView;
  @FXML private ListView<SymbolStyleSearchResult> hatSelectionListView;
  @FXML private ListView<SymbolStyleSearchResult> eyesSelectionListView;
  @FXML private ListView<SymbolStyleSearchResult> mouthSelectionListView;
  @FXML private Slider sizeSlider;
  @FXML private ImageView symbolPreview;
  @FXML private ColorPicker colorPicker;

  private GraphicsOverlay graphicsOverlay;
  private MultilayerPointSymbol faceSymbol;
  private SymbolStyle emojiStyle;

  @FXML
  public void initialize() {
    // 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);

    // set the map to the map view
    mapView.setMap(map);

    // create a graphics overlay and add it to the map
    graphicsOverlay = new GraphicsOverlay();
    mapView.getGraphicsOverlays().add(graphicsOverlay);

    // load the available symbols from the style file
    loadSymbolsFromStyleFile();

    // create a listener that builds the composite symbol when an item from the list view is selected
    ChangeListener<Object> changeListener = (obs, oldValue, newValue) -> buildCompositeSymbol();

    // create a list of the ListView objects and iterate over it
    List<ListView<SymbolStyleSearchResult>> listViews = Arrays.asList(hatSelectionListView, eyesSelectionListView, mouthSelectionListView);
    for (ListView<SymbolStyleSearchResult> listView : listViews) {
      // add the cell factory to show the symbol within the list view
      listView.setCellFactory(c -> new SymbolLayerInfoListCell());
      // add the change listener to rebuild the preview when a selection is made
      listView.getSelectionModel().selectedItemProperty().addListener(changeListener);
      // add an empty entry to the list view to allow selecting 'nothing', and make it selected by default
      listView.getItems().add(null);
      listView.getSelectionModel().select(0);
    }
  }

  /**
   * Loads the stylx file and searches for all symbols contained within. Puts the resulting symbols into the GUI
   * based on their category (eyes, mouth, hat, face).
   */
  private void loadSymbolsFromStyleFile() {
    // create a SymbolStyle with the .stylx file
    File stylxFile = new File(System.getProperty("data.dir"), "./samples-data/stylx/emoji-mobile.stylx");
    emojiStyle = new SymbolStyle(stylxFile.getAbsolutePath());
    emojiStyle.loadAsync();

    // wait for the symbol style to load
    emojiStyle.addDoneLoadingListener(() -> {
      if (emojiStyle.getLoadStatus() == LoadStatus.FAILED_TO_LOAD) {
        new Alert(Alert.AlertType.ERROR, "Error: could not load .stylx file. Details: " + emojiStyle.getLoadError().getMessage()).show();
        return;
      }

      // load the default search parameters
      ListenableFuture<SymbolStyleSearchParameters> defaultSearchParametersFuture = emojiStyle.getDefaultSearchParametersAsync();
      defaultSearchParametersFuture.addDoneListener(() -> {
        try {
          SymbolStyleSearchParameters defaultSearchParameters = defaultSearchParametersFuture.get();

          // use the default parameters to perform the search, getting all the available symbols within the file
          ListenableFuture<List<SymbolStyleSearchResult>> symbolStyleSearchResultFuture = emojiStyle.searchSymbolsAsync(defaultSearchParameters);
          symbolStyleSearchResultFuture.addDoneListener(() -> {
            try {

              // loop through the results and add each item to a list view according to category
              List<SymbolStyleSearchResult> symbolStyleSearchResults = symbolStyleSearchResultFuture.get();
              symbolStyleSearchResults.forEach(symbolStyleSearchResult -> {

                // add the SymbolStyleSearchResult object to the correct list for its category
                switch (symbolStyleSearchResult.getCategory()) {
                  case "Hat":
                    hatSelectionListView.getItems().add(symbolStyleSearchResult);
                    break;
                  case "Eyes":
                    eyesSelectionListView.getItems().add(symbolStyleSearchResult);
                    break;
                  case "Mouth":
                    mouthSelectionListView.getItems().add(symbolStyleSearchResult);
                    break;
                }
              });

              // create the symbol to populate the preview
              buildCompositeSymbol();

            } catch (InterruptedException | ExecutionException e) {
              new Alert(Alert.AlertType.ERROR, "Error performing the symbol search" + e.getMessage()).show();
            }
          });
        } catch (InterruptedException | ExecutionException e) {
          new Alert(Alert.AlertType.ERROR, "Error retrieving default search parameters for symbol search" + e.getMessage()).show();
        }
      });
    });
  }

  /**
   * Gets the keys of the selected symbol components, and constructs a multilayer point symbol, and updates the symbol preview.
   */
  @FXML
  private void buildCompositeSymbol() {

    // retrieve the requested keys for the selected hat, eyes and mouth symbols
    String hatKey = getRequestedSymbolKey(hatSelectionListView);
    String eyesKey = getRequestedSymbolKey(eyesSelectionListView);
    String mouthKey = getRequestedSymbolKey(mouthSelectionListView);

    // create a list of keys to use for getting the requested symbol
    List<String> symbolKeys = Arrays.asList("Face1", eyesKey, mouthKey, hatKey);

    // get the symbol from the SymbolStyle
    ListenableFuture<Symbol> symbolFuture = emojiStyle.getSymbolAsync(symbolKeys);
    symbolFuture.addDoneListener(() -> {
      try {
        faceSymbol = (MultilayerPointSymbol) symbolFuture.get();
        if (faceSymbol == null) {
          return;
        }

        // loop through all the symbol layers and lock the color
        faceSymbol.getSymbolLayers().forEach(symbolLayer -> symbolLayer.setColorLocked(true));

        // unlock the color of the base layer. Changing the symbol layer color will now only change this layer's color
        faceSymbol.getSymbolLayers().get(0).setColorLocked(false);

        // set the color of the symbol
        faceSymbol.setColor(colorPicker.getValue());

        // set the size of the symbol
        faceSymbol.setSize((float) sizeSlider.getValue());

        // update the symbol preview
        updateSymbolPreview(faceSymbol);

      } catch (ExecutionException | InterruptedException e) {
        new Alert(Alert.AlertType.ERROR, "Error creating symbol with the provided symbol keys" + e.getMessage()).show();
      }
    });
  }

  /**
   * Returns the symbol key of the symbol style search result that is currently selected in the list view.
   *
   * @param listView the list view of which to query the selected item
   * @return String representing the key of the selected symbol style
   */
  private String getRequestedSymbolKey(ListView<SymbolStyleSearchResult> listView) {
    SymbolStyleSearchResult requestedSymbol = listView.getSelectionModel().getSelectedItem();
    return (requestedSymbol != null ? requestedSymbol.getKey() : "");
  }

  /**
   * Creates an ImageView object from a provided symbol and displays it in the preview area.
   *
   * @param multilayerPointSymbol the symbol used to create the image view
   */
  private void updateSymbolPreview(MultilayerPointSymbol multilayerPointSymbol) {
    // remove the previously displayed image view
    symbolPreview.setImage(null);

    // create an image and image view from the symbol
    ListenableFuture<Image> symbolImageFuture = multilayerPointSymbol.createSwatchAsync(Color.TRANSPARENT, 1);
    try {
      // display the image view in the preview area
      symbolPreview.setImage(symbolImageFuture.get());

    } catch (InterruptedException | ExecutionException e) {
      new Alert(Alert.AlertType.ERROR, "Error creating preview ImageView from provided MultilayerPointSymbol" + e.getMessage()).show();
    }
  }

  /**
   * Adds graphics to the map view on mouse clicks.
   *
   * @param e mouse button click event
   */
  @FXML
  private void handleMouseClicked(MouseEvent e) {
    if (e.getButton() == MouseButton.PRIMARY && e.isStillSincePress()) {
      // convert clicked point to a map point
      Point mapPoint = mapView.screenToLocation(new Point2D(e.getX(), e.getY()));

      // create a new graphic with the point and symbol
      Graphic graphic = new Graphic(mapPoint, faceSymbol);
      graphicsOverlay.getGraphics().add(graphic);
    }
  }

  /**
   * Clears all the graphics from the graphics overlay.
   */
  @FXML
  private void clearView() {
    graphicsOverlay.getGraphics().clear();
  }

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

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

}