org.locationtech.geoff.geocoding.ui.GeocodingPart.java Source code

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Here is the source code for org.locationtech.geoff.geocoding.ui.GeocodingPart.java

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/*******************************************************************************
 * Copyright (c) 2016 Erdal Karaca and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Erdal Karaca - initial API and implementation
 *******************************************************************************/
package org.locationtech.geoff.geocoding.ui;

import static org.locationtech.geoff.core.Geoff.feature;
import static org.locationtech.geoff.core.Geoff.icon;
import static org.locationtech.geoff.core.Geoff.pointGeom;
import static org.locationtech.geoff.core.Geoff.style;
import static org.locationtech.geoff.core.Geoff.vectorLayer;
import static org.locationtech.geoff.core.Geoff.vectorSource;
import static org.locationtech.geoff.core.Geoff.xyLocation;

import java.util.List;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import org.eclipse.jface.databinding.swt.ISWTObservableValue;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;
import org.locationtech.geoff.Feature;
import org.locationtech.geoff.GeoMap;
import org.locationtech.geoff.Location;
import org.locationtech.geoff.XYZLocation;
import org.locationtech.geoff.core.Geoff;
import org.locationtech.geoff.geocoding.IGeocodingService;
import org.locationtech.geoff.geocoding.POI;
import org.locationtech.geoff.geocoding.POI.LatLon;
import org.locationtech.geoff.geom.Geometry;
import org.locationtech.geoff.layer.TileLayer;
import org.locationtech.geoff.layer.VectorLayer;
import org.locationtech.geoff.source.SourceFormat;
import org.locationtech.geoff.source.VectorSource;
import org.locationtech.geoff.ui.swt.GeoMapComposite;

public class GeocodingPart {

    @Inject
    private IGeocodingService geoService;
    private XYZLocation markerLocation;
    private GeoMap mapModel = createBaseMap();
    private GeoMapComposite mapUI;

    @PostConstruct
    public void createContents(Composite parent) {
        SashForm sash = new SashForm(parent, SWT.VERTICAL);
        {
            Composite container = new Composite(sash, SWT.None);
            container.setLayout(GridLayoutFactory.swtDefaults().numColumns(1).create());
            Text text = new Text(container, SWT.V_SCROLL | SWT.WRAP | SWT.SEARCH);
            text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
            text.setMessage("Enter location name...");

            TableViewer viewer = new TableViewer(container);
            viewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
            viewer.setLabelProvider(new LabelProvider() {
                @Override
                public String getText(Object element) {
                    POI poi = (POI) element;
                    LatLon latLon = poi.getLatLon();
                    return String.format("%s (lon: %f, lat: %f)", poi.getDescription(), latLon.getLon(),
                            latLon.getLat());
                }

                @Override
                public Image getImage(Object element) {
                    return super.getImage(element);
                }
            });
            viewer.setContentProvider(ArrayContentProvider.getInstance());

            ISWTObservableValue textObservable = WidgetProperties.text(SWT.Modify).observeDelayed(1000, text);
            textObservable.addValueChangeListener((e) -> {
                List<POI> result = geoService.executeQuery(text.getText());
                viewer.setInput(result);
            });

            viewer.addSelectionChangedListener((e) -> {
                IStructuredSelection sel = viewer.getStructuredSelection();

                if (sel.isEmpty()) {
                    return;
                }

                POI selectedPOI = (POI) sel.getFirstElement();
                LatLon ll = selectedPOI.getLatLon();
                Location newLocation = Geoff.xyLocation(ll.getLon(), ll.getLat(), Geoff.EPSG4326_WGS84);

                mapUI.groupModelChanges(() -> {
                    markerLocation.setX(ll.getLon());
                    markerLocation.setY(ll.getLat());
                    mapModel.getView().setCenter(newLocation);
                });
            });
        }

        mapUI = new GeoMapComposite(sash, SWT.None);
        mapUI.loadMap(mapModel);
    }

    private GeoMap createBaseMap() {
        Geoff geoMap = Geoff.createMap().view(Geoff.xyLocation(0, 0, Geoff.EPSG4326_WGS84), 1);
        {
            VectorSource source = Geoff.vectorSource();
            source.setFormat(SourceFormat.GEO_JSON);
            source.setProjection(Geoff.EPSG3857_WEB_MERCATOR);
            source.setUrl("/org.locationtech.geoff.geocoding.ui/resources/countries.geojson");
            VectorLayer layer = Geoff.vectorLayer(source);
            Geoff.populateDefaultStyles(layer);
            geoMap.addLayer(layer);
        }
        {
            VectorSource vectorSource = vectorSource();
            markerLocation = xyLocation(0, 0, Geoff.EPSG4326_WGS84);
            Geometry geometry = pointGeom(markerLocation);
            Feature feature = feature(geometry,
                    style(icon("/org.locationtech.geoff.geocoding.ui/resources/marker.gif")));
            vectorSource.getFeatures().add(feature);
            geoMap.addLayer(vectorLayer(vectorSource));
        }

        return geoMap.get();
    }
}