Source code: JTextFieldLinesTest

Código fuente del programa JTextFieldLinesTest

Ver la entrada correspondiente en el siguiente enlace:

JTextField y saltos de línea

package pruebas;

import java.awt.Component;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JToggleButton;
import javax.swing.SwingUtilities;
import javax.swing.text.AbstractDocument;
import javax.swing.text.Document;
import javax.swing.text.DocumentFilter;

/**
 * @see http://bugs.sun.com/view_bug.do?bug_id=6427290
 */
public class JTextFieldLinesTest {

    public static String makeInfo() {
        String info= String.format(""
            + "%njava.class.version= "            + System.getProperty("java.class.version")
            + "%njava.runtime.version= "          + System.getProperty("java.runtime.version")
            + "%njava.specification.name= "       + System.getProperty("java.specification.name")
            + "%njava.specification.vendor= "     + System.getProperty("java.specification.vendor")
            + "%njava.specification.version= "    + System.getProperty("java.specification.version")
            + "%njava.version= "                  + System.getProperty("java.version")
            + "%njava.vm.info= "                  + System.getProperty("java.vm.info")
            + "%njava.vm.name= "                  + System.getProperty("java.vm.name")
            + "%njava.vm.specification.name= "    + System.getProperty("java.vm.specification.name")
            + "%njava.vm.specification.vendor= "  + System.getProperty("java.vm.specification.vendor")
            + "%njava.vm.specification.version= " + System.getProperty("java.vm.specification.version")
            + "%njava.vm.vendor= "                + System.getProperty("java.vm.vendor")
            + "%njava.vm.version= "               + System.getProperty("java.vm.version")
            + "%nos.arch= "                       + System.getProperty("os.arch")
            + "%nos.name= "                       + System.getProperty("os.name")
            + "%nos.version= "                    + System.getProperty("os.version")
            + "%n"
        );

        return info;
    }
    //--------------------------------------------------------------------------

    public static void selectAll(final JTextField aTextField) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                aTextField.selectAll();
                aTextField.requestFocusInWindow();
            }
        });
    }
    //--------------------------------------------------------------------------

    public static void example() {
        final String DEFAULT_TEXT= String.format("Line1%nLine2%nLine3%nLine4%nLine5");

        JTextArea textArea= new JTextArea();
        textArea.setText( makeInfo() );
        textArea.setEditable(false);

        final JTextField textField= new JTextField();
        textField.setEditable(true);

        String text= String.format(DEFAULT_TEXT);
        textField.setText(text);
        selectAll(textField);

        final JToggleButton button= new JToggleButton("Toogle new lines mode");

        final JPanel panel= new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
        textArea.setAlignmentX(Component.CENTER_ALIGNMENT);
        textField.setAlignmentX(Component.CENTER_ALIGNMENT);
        button.setAlignmentX(Component.CENTER_ALIGNMENT);
        panel.add(textArea);
        panel.add(new JSeparator(JSeparator.HORIZONTAL));
        panel.add(textField);
        panel.add(new JSeparator(JSeparator.HORIZONTAL));
        panel.add(button);

        final JFrame frame= new JFrame("JTextField test");
        frame.setContentPane(panel);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        button.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                Document document= textField.getDocument();
                AbstractDocument abstractDocument= (AbstractDocument) document;

                DocumentFilter filter;
                if (button.isSelected() == true) {
                    filter= new DocumentFilter();
                }
                else {
                    filter= null;
                }
                abstractDocument.setDocumentFilter(filter);

                String text= DEFAULT_TEXT;
                textField.setText(text);
                selectAll(textField);

                panel.revalidate();
                panel.repaint();
                frame.pack();
            }
        });

        frame.setVisible(true);
    }
    //--------------------------------------------------------------------------

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                example();
            }
        });
    }
    //--------------------------------------------------------------------------

}