org.rebioma.client.maps.GeocoderControl.java Source code

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Here is the source code for org.rebioma.client.maps.GeocoderControl.java

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/*
 * Copyright 2008 University of California at Berkeley
 * 
 * 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 org.rebioma.client.maps;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.maps.client.base.LatLng;
import com.google.gwt.maps.client.base.Point;
import com.google.gwt.maps.client.base.Size;
import com.google.gwt.maps.client.overlays.Marker;
import com.google.gwt.maps.client.overlays.MarkerImage;
import com.google.gwt.maps.client.overlays.MarkerOptions;
import com.google.gwt.maps.client.services.Geocoder;
import com.google.gwt.maps.client.services.GeocoderRequest;
import com.google.gwt.maps.client.services.GeocoderRequestHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitHandler;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.TextBox;

public class GeocoderControl extends FlowPanel {

    private static MarkerOptions getOptions(LatLng point, String address) {
        MarkerImage icon = MarkerImage.newInstance("http://www.google.com/mapfiles/arrow.png");
        //      icon.setSize(Size.newInstance(39, 34));
        //      icon.setAnchor(Point.newInstance(9, 34));
        //      icon.setOrigin(Point.newInstance(9, 2));
        MarkerImage shadow = MarkerImage.newInstance("http://www.google.com/mapfiles/arrowshadow.png");
        //      shadow.setSize(Size.newInstance(39, 34));
        MarkerOptions options = MarkerOptions.newInstance();
        options.setClickable(true);
        options.setDraggable(false);
        options.setIcon(icon);
        options.setShadow(shadow);
        options.setTitle(address);
        return options;
    }

    public static Marker createMarker(LatLng point, String address) {
        MarkerOptions options = getOptions(point, address);
        Marker marker = Marker.newInstance(options);
        marker.setPosition(point);
        return marker;
    }

    // private Map<String, LatLng> cache;
    private final Geocoder geocoder;
    private final GeocoderRequest geocoderRequest;
    private final GeocoderRequestHandler geocoderRequestHandler;
    private final TextBox addressBox = new TextBox();

    private Button submit;

    public GeocoderControl(GeocoderRequestHandler requestHandler) {
        super();
        this.geocoderRequestHandler = requestHandler;
        this.geocoderRequest = GeocoderRequest.newInstance();
        this.geocoder = Geocoder.newInstance();
        final FormPanel form = new FormPanel();
        form.setAction("#");
        Panel formElements = new FlowPanel();
        addressBox.setVisibleLength(26);
        addressBox.selectAll();
        formElements.add(addressBox);
        submit = new Button("Find place");
        formElements.add(submit);

        submit.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                String address = getAddress();
                if (address == null || address.trim().length() == 0) {
                    Window.alert("Please enter an address.");
                    return;
                }
                form.submit();
            }
        });
        //      formElements.add(new HTML("&nbsp;"));
        form.add(formElements);
        form.addSubmitHandler(new SubmitHandler() {
            public void onSubmit(SubmitEvent event) {
                lookupAddress(addressBox.getText());
                event.cancel();
            }
        });
        add(form);
    }

    public String getAddress() {
        return addressBox.getText();
    }

    // public LatLng getCachedPoint(String address) {
    // if (cache == null) {
    // cache = new HashMap<String, LatLng>();
    // }
    // return cache.get(address);
    // }

    public void lookupAddress(final String address) {
        lookupAddress(address, this.geocoderRequestHandler);
    }

    public void lookupAddress(final String address, GeocoderRequestHandler requestHandler) {
        geocoderRequest.setAddress(address);
        geocoder.geocode(geocoderRequest, requestHandler);
    }

    public void setAddress(String address) {
        addressBox.setText(address);
    }
}