gvcomponentholder.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 java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Component;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;

/**
 * An object in GridView that can hold an AWT Component.
 * Meant to make arbitrary Java components live peacefully in GridView.
 *
 * @author randy
 */
public class GVComponentHolder extends GVTangibleObject implements ComponentListener {
    
    public GVComponentHolder() {
    }
    
    /*
     * This object typically wraps exactly the singe object it contains.
     * This method is called to make that happen. an extra bit of length and
     * wdith allow for mouse drag events associated with resizeing the component to be 
     * processed.
     */
    public void getSnug(){
        if(getComponents().length == 0) return;
        Component c = getComponents()[0];
        setSize(c.getWidth() + 20, c.getHeight() + 20);
    }
    
    /*
     * 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.
     *
     */
    public Component add(Component c){
        if(getComponents().length != 0){
            Component comp = getComponents()[0];
            comp.removeComponentListener(this);
            remove(comp); 
        }
        super.add(c);
        c.setLocation(0,0);
        c.setVisible(true);
        getSnug();
        c.addComponentListener(this); 
        return c;
    }
    
    /*
     * preserves access to the traditional meaning of remove()
     */
    public void removeComponent(Component c){
        super.remove(c);
    }
    
    public void remove(Component c){
        super.remove(c);
        //TO DO remove this loosePiece from the loosePieceParent.
        if(getLooseParent() != null){
            ((GVTangibleObject)getLooseParent()).removeLoosePiece(this);
        } 
        GridView gv = getView();
        gv.remove(this);
        gv.repaint();
    }
    
    public void paintComponentNoShadow(Graphics2D g2){ 
        //Invisible
    }
    
    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); 
            g2.fillRect(0,0,getWidth(),getHeight());
            //g2.drawString(getJLabel().getText(), 0 , 0);  
            g2.setComposite(ca);
        }
    }
    
    public void componentResized(ComponentEvent componentEvent) {
        getSnug();
        repaint();
    }

    public void componentMoved(ComponentEvent componentEvent) {
        //This code enforces a "no move" poilicy
        Component c = componentEvent.getComponent();
        int cx = c.getX();
        int cy = c.getY();
        if(cx == 0 && cy == 0){
            return;
        }
        c.setLocation(0,0);
    }

    public void componentShown(ComponentEvent componentEvent) {
    }

    public void componentHidden(ComponentEvent componentEvent) {
    }
}