maphandlermenuitem.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/gui/menu/MapHandlerMenuItem.java,v $
// $RCSfile: MapHandlerMenuItem.java,v $
// $Revision: 1.2.2.2 $
// $Date: 2005/02/11 22:51:24 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.gui.menu;

import java.beans.beancontext.BeanContext;

import javax.swing.JMenuItem;

import com.bbn.openmap.Environment;
import com.bbn.openmap.I18n;
import com.bbn.openmap.LightMapHandlerChild;
import com.bbn.openmap.MapHandler;

/**
 * A MapHandlerMenuItem is a JMenuItem that uses the MapHandler to
 * find objects it needs to operate. It's a LightMapHandlerChild so
 * that it's parent AbstractOpenMapMenu will provide the MapHandler
 * and other MapHandler objects to it. The MapHandlerMenuItem doesn't
 * really need to be added to the MapHandler unless something else
 * needs to find it from the MapHandler. Instead, it will see
 * everything else in the MapHandler.
 */
public abstract class MapHandlerMenuItem extends JMenuItem implements
        LightMapHandlerChild {

    protected MapHandler mapHandler = null;

    protected I18n i18n = Environment.getI18n();

    public MapHandlerMenuItem(String title) {
        super(title);
    }

    public void setMapHandler(BeanContext in_mapHandler) {
        if (in_mapHandler instanceof MapHandler) {
            mapHandler = (MapHandler) in_mapHandler;
        }
        setEnabled(mapHandler != null);
    }

    public MapHandler getMapHandler() {
        return mapHandler;
    }

    public void findAndInit(Object someObj) {
        if (someObj instanceof MapHandler) {
            setMapHandler((MapHandler) someObj);
        }
    }

    public void findAndUndo(Object someObj) {
        if (someObj instanceof MapHandler) {
            setMapHandler(null);
        }
    }
}