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How to create a partially transparent JButton on a fully transparent JFrame?

I can make the JFrame completely transparent, and the JButton partially transparent is just fine, until I move the mouse over the button (don't click) and disconnect the mouse from the button (MouseExited called via MouseListener). It happens that the JButton background is drawn again, so after several mouse movements on the button and on the button, the button is completely opaque.

public class ButtonExample extends JWindow
{
   public ButtonExample( )
   {
        JButton But = new JButton( "Testing" );
        But.setBackground( new Color( 0, 0, 0, 200 ) );
        But.setForeground( new Color( 70, 155, 255 ) );
        this.add( But );
        this.setBackground( new Color( 0, 0, 0, 0 ) );
        this.setMinimumSize( new Dimension( 200,100 ) );
        this.setVisible( true );
    }

    public static void main( String[ ] Args ) 
    {
        new ButtonExample( );
    }
}
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2 answers

the problem is that the button message is completely opaque when in fact it is not (due to the partially transparent color)

  but.setOpaque(false);

BTW: , , java:-)

Edit

arggghh.. , . , SwingX, , , paintComponent ,

        /** 
         * @inherited <p>
         */
        @Override
        protected void paintComponent(Graphics g) {
            if (!isOpaque() && getBackground().getAlpha() < 255) {
                g.setColor(getBackground());
                g.fillRect(0, 0, getWidth(), getHeight());
            }
            super.paintComponent(g);
        }

, , , " " ..

2

okay, checked - . , :

  • , , .
  • (SwingX JXPanel f.i. -)

, runnable /

public class TransparentButton  {

    public TransparentButton() {
        JWindow incorrectOpaque = createWindow("incorrect opaque", true);
        incorrectOpaque.setLocation(600, 600);
        incorrectOpaque.setVisible(true);
        JWindow correctOpaque = createWindow("correct opaque", false);
        correctOpaque.setLocation(800, 600);
        correctOpaque.setVisible(true);
    }


    private JButton createButton(final boolean opaque) {
        JButton but = new JButton("Testing") {

            /**
             * @inherited <p>
             * Overridden to take over background painting with 
             * transparent color.
             */
            @Override
            protected void paintComponent(Graphics g) {
                if (!isOpaque() && getBackground().getAlpha() < 255) {
                    g.setColor(getBackground());
                    g.fillRect(0, 0, getWidth(), getHeight());
                }
                super.paintComponent(g);
            }

        };
        but.setBackground(new Color(0, 0, 0, 100));
        but.setForeground(new Color(70, 155, 255));
        but.setOpaque(opaque);
        return but;
    }

    private JWindow createWindow(String text, boolean opaque) {
        JWindow window = new JWindow();
        JButton but = createButton(opaque);
        window.add(but);
        window.add(new JLabel(""), BorderLayout.SOUTH);
        window.setOpacity(0.5f);
        window.setBackground(new Color(0, 0, 0, 0));
        window.setSize(new Dimension(200, 100));
        return window;
    }

    public static void main(String[] Args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {

                new TransparentButton();
            }
        });
    }

    @SuppressWarnings("unused")
    private static final Logger LOG = Logger.getLogger(TransparentButton.class
            .getName());
}
+8

?

API Java SE 6 Update 10 API. AWT JDK 7.

, .

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