Java Swing JToolBar

Question

I have created JToolBar (Java Swing). I have set a Background image on frame which contains JToolBar. I want my JToolBar to be transparent so that the image kept on frame should be visible. I am using setOpaque(false) but it is not having any effect on my toolbar.. Has anyone delt with this before? My Code is as follows

import javax.swing.ImageIcon; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException;

public class NewJFrame extends javax.swing.JFrame { static NewJFrame dialog = null;

/** Creates new form NewJFrame */
public NewJFrame() {
    initComponents();
    jToolBar1.setOpaque(false);
}

/** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

    jToolBar1 = new javax.swing.JToolBar();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jToolBar1.setRollover(true);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jToolBar1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addComponent(jToolBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(275, Short.MAX_VALUE))
    );

    pack();
}// </editor-fold>

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {



        public void run() {

            try {
                try {
                    // Set cross-platform Java L&F (also called "Metal")
                    UIManager.setLookAndFeel(UIManager.
                            getSystemLookAndFeelClassName());

                } catch (UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
            ImagePanel panel = new ImagePanel(new ImageIcon("image").getImage());
            dialog = new NewJFrame();
            dialog.getContentPane().add(panel);
            dialog.setVisible(true);
        }
    });
}

// Variables declaration - do not modify
private javax.swing.JToolBar jToolBar1;
// End of variables declaration

}

Answer 1

There was a bug with JToolBar ignoring setOpaque and background image http://bugs.sun.com/bugdatabase/view%5Fbug.do?bug%5Fid=6418117

They say it was fixed in 1.6. What version are you using?

What if you set the same image as background for JToolBar? Would two backgrounds overlap?

Answer 2

Works fine for me using the Metal LAF with JDK 6 on XP.

If you need more help post your SSCCE showing the problem.

Answer 3

JToolBar creates JButtons to contain the actions you set on it. By default, JButtons are opaque. To get the effect you're describing, you need to override JToolBar.createActionComponent.

For example:

    jToolBar1 = new javax.swing.JToolBar() {
        @Override
        protected JButton createActionComponent(Action a) {
            JButton jb = super.createActionComponent(a);
            jb.setOpaque(false);
            return jb;
        }
    };

Note: YMMV depending on the LAF in use.