doublepanel.java

这是一个以JAVA编写的程序,本人还没有试过,是一个简单的温度控制系统

package net.sf.dz.util.wizard;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout; 
import java.util.Iterator;
import java.util.List;
import java.util.LinkedList;
import java.util.Map;
import java.util.TreeMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * A helper class that provides a panel with subpanels and arbitrary number
 * of buttons in the middle.
 *
 * @author Copyright &copy; <a href="mailto:[e-mail]">Vadim Tkachenko</a> 2004
 * @version $Id: DoublePanel.java,v 1.3 2004/07/13 03:16:07 vtt Exp $
 */
public class DoublePanel {

    protected final JPanel parent;

    protected final JPanel buttonPanel = new JPanel();
    
    public final JPanel leftPanel = new RigidPanel();
    public final JPanel rightPanel = new RigidPanel();

    protected List buttonList = new LinkedList();
    protected Map buttonMap = new TreeMap();
    
    public DoublePanel(JPanel parent, WizardPage listener, List buttonNames) {
    
        this.parent = parent;
        
        GridBagLayout layout = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        
        parent.setLayout(layout);
        
        cs.gridx = 0;
        cs.gridy = 0;
        cs.fill = GridBagConstraints.BOTH;
        cs.gridwidth = 1;
        cs.gridheight = 1;
        cs.weightx = 1;
        cs.weighty = 1;
        
        layout.setConstraints(leftPanel, cs);
        parent.add(leftPanel);

        cs.gridx++;
        cs.weightx = 0;
        cs.fill = GridBagConstraints.VERTICAL;
        
        layout.setConstraints(buttonPanel, cs);
        parent.add(buttonPanel);
        
        createButtons(buttonNames, listener);
        
        cs.gridx++;
        cs.fill = GridBagConstraints.BOTH;
        cs.weightx = 1;
        
        layout.setConstraints(rightPanel, cs);
        parent.add(rightPanel);
        
    }

    private void createButtons(List buttonNames, WizardPage listener) {
    
        GridBagLayout layout = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        
        buttonPanel.setLayout(layout);
        
        cs.gridx = 0;
        cs.gridy = 0;
        cs.gridwidth = 1;
        cs.gridheight = 1;
        cs.weightx = 0;
        cs.weighty = 1;
        cs.fill = GridBagConstraints.BOTH;
        
        JPanel fillerTop = new JPanel();
        
        layout.setConstraints(fillerTop, cs);
        buttonPanel.add(fillerTop);

        cs.gridy++;
        cs.weightx = 0;
        cs.fill = GridBagConstraints.HORIZONTAL;
        
        for ( Iterator i = buttonNames.iterator(); i.hasNext(); ) {
        
            String name = i.next().toString();
            
            if ( "<separator>".equals(name) ) {
            
                JLabel filler = new JLabel();
                
                cs.weighty = 1;
                layout.setConstraints(filler, cs);
                buttonPanel.add(filler);
            
            } else {
            
                JButton b = new JButton(name);
                
                cs.weighty = 0;
                layout.setConstraints(b, cs);
                buttonPanel.add(b);
                
                b.addActionListener(listener);
                
                buttonMap.put(name, b);
                buttonList.add(b);
            }
            
            cs.gridy++;
        }

        cs.gridy++;
        cs.fill = GridBagConstraints.BOTH;
        cs.weightx = 1;
        cs.weighty = 1;
        
        JPanel fillerBottom = new JPanel();
        
        layout.setConstraints(fillerBottom, cs);
        buttonPanel.add(fillerBottom);
    }
    
    public JButton getButton(String name) {
    
        return (JButton)buttonMap.get(name);
    }
    
    public JButton getButton(int offset) {
    
        return (JButton)buttonList.get(offset);
    }
    
    public final void add(JPanel parent, JComponent child) {
    
        GridBagLayout layout = new GridBagLayout();
        GridBagConstraints cs = new GridBagConstraints();
        
        parent.setLayout(layout);
        
        cs.gridx = 0;
        cs.gridy = 0;
        cs.gridwidth = 1;
        cs.gridheight = 1;
        cs.weightx = 1;
        cs.weighty = 1;
        cs.fill = GridBagConstraints.BOTH;
        
        layout.setConstraints(child, cs);
        parent.add(child);
    }
    
    protected class RigidPanel extends JPanel {
    
        private boolean inside = false;
        
        public synchronized Dimension getPreferredSize() {
        
            Container parent = getParent();
            Dimension self = super.getPreferredSize();
            
            if ( inside ) {
            
                return self;

            } else {
            
                inside = true;
            
                if ( parent != null ) {
                
                    Dimension parentDimension = parent.getPreferredSize();
                    Dimension buttonDimension = buttonPanel.getPreferredSize();
                    
                    // Let's say that the preferred width is half of the parent
                    // preferred with less button panel preferred width
                    
                    self.width = (parentDimension.width - buttonDimension.width) / 2;
                }
                
                inside = false;
            }
            
            return self;
        }
    }
}