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GMap3 component.
There is a newer version: 10.3.0
package org.wicketstuff.gmap.api;

import java.util.Optional;

import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.string.Strings;
import org.wicketstuff.gmap.js.Constructor;
import org.wicketstuff.gmap.js.ObjectLiteral;

/**
 * Represents an Google Maps API's GInfoWindow.
 *
 * You can attach following events to an InfoWindow in case you want to react to one of those:
 *
 * @see GEvent#content_changed
 * @see GEvent#domready
 * @see GEvent#closeclick
 */
public class GInfoWindow extends GOverlay
{

    /**
     * Default serialVersionUID.
     */
    private static final long serialVersionUID = 1L;
    private GLatLng latLng;
    private GMarker marker;
    private String content;
    private boolean contentIsNode;
    private Integer maxWidth;
    private Boolean disableAutoPan;
    private Integer zIndex;

    /**
     * Constructor.
     * @param latLng the position where the info window should be opened
     * @param content the (HTML) content which should be shown. Any containing 
     * apostrophes will be escaped.
     */
    public GInfoWindow(GLatLng latLng, String content)
    {
      this(latLng);
      this.content = Strings.replaceAll(content, "'", "\\'").toString();
    }
    
    /**
     * Constructor.
     * @param latLng the position where the info window should be opened
     * @param content the Component which should be shown. Internally uses document.getElementById('" + markupId + "') to link to the GInfoWindow 
     */
    public GInfoWindow(GLatLng latLng, Component content)
    {
      this(latLng);

      Args.notNull(content, "content");

      content.setOutputMarkupId(true);
      String markupId = content.getMarkupId(true);
      this.content = String.format("document.getElementById('%s')", markupId);
      contentIsNode = true;
    }
    
    private GInfoWindow(GLatLng latLng)
    {
        super();
        this.latLng = Args.notNull(latLng, "latLng");
    }

    @Override
    public String getJSconstructor()
    {

        ObjectLiteral args = new ObjectLiteral();
        if (!contentIsNode)
        {
            args.setString("content", content);
        }
        else
        {
            args.set("content", content);
        }
        
        args.set("position", latLng.toString());

        if (maxWidth != null)
        {
            args.set("maxWidth", maxWidth.toString());
        }

        if (disableAutoPan != null)
        {
            args.set("disableAutoPan", disableAutoPan.toString());
        }

        if (zIndex != null)
        {
            args.set("zIndex", zIndex.toString());
        }
        
        Constructor constructor = new Constructor("google.maps.InfoWindow").add(args.toJS());
        return constructor.toJS();
    }

    /**
     * Update state from a request to an AJAX target.
     */
    @Override
    protected void updateOnAjaxCall(AjaxRequestTarget target, GEvent overlayEvent)
    {
    }

    public boolean isOpen()
    {
        return (latLng != null || marker != null);
    }

    public void close()
    {
        marker = null;
        latLng = null;

        Optional targetOptional = RequestCycle.get().find(AjaxRequestTarget.class);
        targetOptional.ifPresent(target -> target.appendJavaScript(super.getJSremove()));
    }

    public GLatLng getLatLng()
    {
        return latLng;
    }

    public void setMaxWidth(Integer maxWidth)
    {
        this.maxWidth = maxWidth;
    }

    public void setLatLng(GLatLng latLng) {
        this.latLng = latLng;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public Integer getMaxWidth() {
        return maxWidth;
    }

    public Boolean getDisableAutoPan() {
        return disableAutoPan;
    }

    public void setDisableAutoPan(Boolean disableAutoPan) {
        this.disableAutoPan = disableAutoPan;
    }

    public Integer getzIndex() {
        return zIndex;
    }

    public void setzIndex(Integer zIndex) {
        this.zIndex = zIndex;
    }
}