SpringDemo4.java Source code

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Here is the source code for SpringDemo4.java

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/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
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 * -Redistribution in binary form must reproduce the above copyright notice,
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 *  and/or other materials provided with the distribution.
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 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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import java.awt.Component;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.Spring;
import javax.swing.SpringLayout;

public class SpringDemo4 {
    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("SpringDemo4");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Set up the content pane.
        Container contentPane = frame.getContentPane();
        SpringLayout layout = new SpringLayout();
        contentPane.setLayout(layout);

        //Create and add the components.
        JLabel label = new JLabel("Label: ");
        JTextField textField = new JTextField("Text field", 15);
        contentPane.add(label);
        contentPane.add(textField);

        //Adjust constraints for the label so it's at (5,5).
        SpringLayout.Constraints labelCons = layout.getConstraints(label);
        labelCons.setX(Spring.constant(5));
        labelCons.setY(Spring.constant(5));

        //Adjust constraints for the text field so it's at
        //(<label's right edge> + 5, 5).
        SpringLayout.Constraints textFieldCons = layout.getConstraints(textField);
        textFieldCons.setX(Spring.sum(Spring.constant(5), labelCons.getConstraint(SpringLayout.EAST)));
        textFieldCons.setY(Spring.constant(5));

        //Adjust constraints for the content pane.
        setContainerSize(contentPane, 5);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    public static void setContainerSize(Container parent, int pad) {
        SpringLayout layout = (SpringLayout) parent.getLayout();
        Component[] components = parent.getComponents();
        Spring maxHeightSpring = Spring.constant(0);
        SpringLayout.Constraints pCons = layout.getConstraints(parent);

        //Set the container's right edge to the right edge
        //of its rightmost component + padding.
        Component rightmost = components[components.length - 1];
        SpringLayout.Constraints rCons = layout.getConstraints(rightmost);
        pCons.setConstraint(SpringLayout.EAST,
                Spring.sum(Spring.constant(pad), rCons.getConstraint(SpringLayout.EAST)));

        //Set the container's bottom edge to the bottom edge
        //of its tallest component + padding.
        for (int i = 0; i < components.length; i++) {
            SpringLayout.Constraints cons = layout.getConstraints(components[i]);
            maxHeightSpring = Spring.max(maxHeightSpring, cons.getConstraint(SpringLayout.SOUTH));
        }
        pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(Spring.constant(pad), maxHeightSpring));
    }
}