Name: krT82822 Date: 07/04/99


orig synopsis: "Floating&redocking a JToolBar sets its LayoutManager to BoxLayout"

If you set a JToolBar's layout manager to something else than
the standard BoxLayout, then at first everything is fine.
However, if you then move and redock the tool bar with a different
orientation (e.g. moving the toolbar from NORTH to WEST, which
causes it to change from horizontal to vertical), the layout
manager changes back to BoxLayout.
This is either a bug or an undocumented feature.
It is reproducible under both JDK 1.2 (demo included) and
under JDK1.1.6 (change the import statements in the included
demo code).

I manipulated the ToolBarDemo.java program from the Java Tutorial
( http://java.sun.com/docs/books/tutorial/uiswing/components/
  example-swing/ToolBarDemo.java )
to demonstrate this.
The program source follows, it contains comments explaining
its use.
The program is for JDK1.2 .

**************CUT HERE*************************
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.ImageIcon;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JPanel;

import java.awt.*;
import java.awt.event.*;

/*
 * Toolbar Bug Demonstration
 * If you set a JToolBar's layout manager to something else than
 * the standard box layout, then at first everything is fine.
 * However, if you then move and redock the tool bar with a different
 * orientation the layout manager changes back to BoxLayout.
 * This is either a bug or an undocumented feature.
 *
 * To use this program:
 * Just click on any button in the window to display the toolbar's
 * current layout manager.
 * Move and redock the toolbar in WEST or EAST position,
 * then click a button again to see the change.
 *
 * Sebastian Leske ###@###.###
 * 5 Feb 1999
 */
public class ToolBarDemo extends JFrame {
    protected JTextArea textArea;
    protected String newline = "\n";
    public JToolBar toolBar = new JToolBar();

    public ToolBarDemo() {
        //Do frame stuff.
        super("ToolBarDemo");
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        //Create the toolbar.
        addButtons(toolBar);

        //Create the text area used for output.
        textArea = new JTextArea(5, 30);
        JScrollPane scrollPane = new JScrollPane(textArea);

//inserted to demonstrate BUG
//set ToolBar layout manager to GridLayout
toolBar.setLayout(new GridLayout());

        //Lay out the content pane.
        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout());
        contentPane.setPreferredSize(new Dimension(400, 100));
        contentPane.add(toolBar, BorderLayout.NORTH);
        contentPane.add(scrollPane, BorderLayout.CENTER);
        setContentPane(contentPane);
    }

    protected void addButtons(JToolBar toolBar) {
        JButton button = null;

        //first button
        button = new JButton("Button");
        button.setToolTipText("This is the left button");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for first button");
            }
        });
        toolBar.add(button);

        //second button
        button = new JButton("Button");
        button.setToolTipText("This is the middle button");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for second button");
            }
        });
        toolBar.add(button);

        //third button
        button = new JButton("Button");
        button.setToolTipText("This is the right button");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for third button");
            }
        });
        toolBar.add(button);
    }

    protected void displayResult(String actionDescription) {
        textArea.append(actionDescription + newline);
//changed to demonstrate BUG
textArea.append("Current toolbar layout manager: "+toolBar.getLayout()+newline);
    }

    public static void main(String[] args) {
        ToolBarDemo frame = new ToolBarDemo();
        frame.pack();
        frame.setVisible(true);
    }
}
(Review ID: 53787)
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