CODEWITHSUNDEEP
javaswing
Thorn G
Thorn G

Reputation: 12766

JMenuBar causes content pane to repaint incorrectly

I've encountered a very strange issue using JMenuBar where navigating between two JMenus results in the contentPane of the JFrame which the menu belongs to to repaint incorrectly. The content pane presents the correct background only where the menu items drop down and 'dirty' the screen -- the rest is entirely white. However, this only occurs after browsing between the two menus, and not right away. It takes a few seconds of switching between for the empty contentPane to change from the ordinary background color.

EDIT To clarify, this is on Windows 7 using JDK 1.7.0.

To better illustrate what I mean, here is the window after launch (manually resized): The window upon launch

And then after using the JMenus for a few seconds: The content pane is now incorrectly painted

Below is a SSCCE demonstrating the problematic code.

package com.test.workspace;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;

public class MenuBarTest extends JFrame {

    /**
     * Eclipse-generated SUID.
     */
    private static final long serialVersionUID = 8836700685077107497L;

    public MenuBarTest() {
        JMenuBar menuBar = new JMenuBar();

        JMenu testMenu = new JMenu("Test");
        JMenuItem testItem = new JMenuItem("TestItem");

        JMenu breakMenu = new JMenu("Break");
        JMenuItem breakItem = new JMenuItem("BreakItem");

        testMenu.add(testItem);

        breakMenu.add(breakItem);

        menuBar.add(testMenu);
        menuBar.add(breakMenu);

        this.setJMenuBar(menuBar);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                MenuBarTest test = new MenuBarTest();
                test.setDefaultCloseOperation(EXIT_ON_CLOSE);
                test.pack();
                test.setVisible(true);
            }           
        });
    }
}

Upvotes: 2

Views: 486

Answers (1)

blackcompe
blackcompe

Reputation: 3190

It must be a platform-specific thing. The GUI appeared fine on my machine: Ubuntu 11.10, Eclipse 3.7, Sun JDK 7.

Upvotes: 1

Related Questions