gvjlabelholder.java

无线传感器网络节点Sun SPOT管理工具

/*
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved. 
 * 
 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product that is
 * described in this document. In particular, and without limitation, these intellectual property rights may
 * include one or more of the U.S. patents listed at http://www.sun.com/patents and one or more additional patents
 * or pending patent applications in the U.S. and in other countries.
 * 
 * U.S. Government Rights - Commercial software. Government users are subject to the Sun Microsystems, Inc.
 * standard license agreement and applicable provisions of the FAR and its supplements.
 * 
 * Use is subject to license terms. 
 * 
 * This distribution may include materials developed by third parties. Sun, Sun Microsystems, the Sun logo and
 * Java are trademarks or registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. 
 * 
 * Copyright (c) 2006 Sun Microsystems, Inc. Tous droits r?serv?s.
 * 
 * Sun Microsystems, Inc. d?tient les droits de propri?t? intellectuels relatifs ? la technologie incorpor?e dans
 * le produit qui est d?crit dans ce document. En particulier, et ce sans limitation, ces droits de propri?t?
 * intellectuelle peuvent inclure un ou plus des brevets am?ricains list?s ? l'adresse http://www.sun.com/patents
 * et un ou les brevets suppl?mentaires ou les applications de brevet en attente aux Etats - Unis et dans les
 * autres pays.
 * 
 * L'utilisation est soumise aux termes du contrat de licence.
 * 
 * Cette distribution peut comprendre des composants d?velopp?s par des tierces parties.
 * Sun, Sun Microsystems, le logo Sun et Java sont des marques de fabrique ou des marques d?pos?es de Sun
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */

package com.sun.spot.spotworld.gridview;

import com.sun.spot.spotworld.common.LocaleUtil;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Component;
import java.awt.Composite;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

/**
 * Holds a JLabel in GridView
 * @author randy
 */
public class GVJLabelHolder extends GVComponentHolder {
    
    public GVJLabelHolder() {
    }
    
    public JLabel getJLabel(){
        if(getComponents().length < 1) return null;
        if(getComponents()[0] instanceof JLabel) {
            return (JLabel) getComponents()[0];
        } else {
            throw new RuntimeException(LocaleUtil.getString("Illegal state: how can you have gotten a non-JLable in here?"));
            //return null;
        }
    }
    
    public void setText(String s){
       /* You would think it might be possible to set
        * the text in a JLabel, but that doesn't allow the
        * JLabel to grow in size.
        *
        * So just make a whole new JLabel.
        */
        if(getJLabel() != null){
            removeComponent(getJLabel());
        }
        JLabel newLbl = new JLabel(s);
        add(newLbl);
        getSnug();
        repaint();
    }
    
    /* 
     * Could also have recenterBelow(), etc. but add those methods as needed.
     */
    public void recenterAbove(final GVObject gvo){
        SwingUtilities.invokeLater(new Runnable(){ public void run(){
            getSnug();
            int pX = gvo.getLocationInView().x;
            int pY = gvo.getLocationInView().y;
            int x = pX + (gvo.getBasicWidth() - getJLabel().getWidth()) / 2;
            int y = pY  - getJLabel().getHeight(); 
            setLocationInView(x,y);
            validate();
            repaint();
        }});
    }
    
    /*
     * This object typically wraps exactly the singe object it contains.
     * This method is called to make that happen.
     */
    public void getSnug(){
        if(getComponents().length == 0) return;
        JLabel c = (JLabel) getComponents()[0];
        setBounds(getLocation().x, 
                getLocation().y, 
                (int) c.getUI().getPreferredSize(c).getWidth(), 
                (int) c.getUI().getPreferredSize(c).getHeight()
                );
    }
    
    /*
     * This object can have one and only one component.
     * Adding a new Component simply replaces the single existing Component.
     * It also makes this a listener for the component's events such as resize, etc.
     * The component must be a JLabel.
     *
     */
    public Component add(Component c){
        if (c instanceof JLabel){
            Dimension d = ((JLabel)c).getUI().getPreferredSize((JLabel)c);
            c.setSize((int) d.getWidth(), (int) d.getHeight());
            return super.add(c);
        } else {
            throw new RuntimeException(LocaleUtil.getString("Can't add anything but a JLabel to this object."));
        }
    }
  
    public void paintShadow(Graphics2D g2) {
        Composite c =  g2.getComposite();
        if(c instanceof AlphaComposite) {
            AlphaComposite ca = (AlphaComposite)c;
            AlphaComposite a = AlphaComposite.getInstance(ca.getRule(), 0.2f);
            g2.setComposite(a);
            g2.setColor(Color.black); 
            getJLabel().paint(g2);
            //g2.drawString(getJLabel().getText(), 0 , 0);  
            g2.setComposite(ca);
        }
    }
}