CODEWITHSUNDEEP
javaswing
carelli99
carelli99

Reputation: 49

Buttons are set to be left-aligned but are still displayed as centered

I'm trying to create an interface with Swing.

This is my code:

public class JavaApplication30 
{
    public static void main(String[] args) throws IOException 
    {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.X_AXIS));
        frame.setPreferredSize(new Dimension(1280, 720));
        frame.setResizable(false);

        frame.setContentPane(new JPanel() 
        {
        BufferedImage image = ImageIO.read(new File("C:\\Users\\user\\Documents\\NetBeansProjects\\JavaApplication29\\src\\eila.jpg"));
        @Override
        public void paintComponent(Graphics g) 
        {
            super.paintComponent(g);
            g.drawImage(image, 0, 0, 1280, 720, this);
        }
        });

        JPanel a = new JPanel();
        a.setAlignmentX(Component.LEFT_ALIGNMENT);
        a.setPreferredSize(new Dimension(150, 500));
        a.setMaximumSize(new Dimension(150, 500));
        a.setOpaque(false);

        a.add(Box.createRigidArea(new Dimension(5,50)));
        JButton amico = new JButton("Amico");
        a.add(amico);
        a.add(Box.createRigidArea(new Dimension(5,20)));
        amico.setPreferredSize(new Dimension(150, 50));
        JButton bello = new JButton("Bello");
        a.add(bello);
        a.add(Box.createRigidArea(new Dimension(5,20)));
        bello.setPreferredSize(new Dimension(150, 50));
        JButton compagno = new JButton("Compagno");
        a.add(compagno);
        compagno.setPreferredSize(new Dimension(150, 50));

        frame.getContentPane().add(a);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

class ImagePanel extends JComponent {
    private Image image;
    public ImagePanel(Image image) {
        this.image = image;
    }
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(image, 0, 0, this);
    }
}

I set the button alignment to the left, but my buttons are still centered.

enter image description here

This didn't happen without paintComponent for the background.

Why is this? How can I align the buttons on the left?

Upvotes: 0

Views: 76

Answers (1)

camickr
camickr

Reputation: 324098

I set Alignment to left, but my buttons are centered

The setAlignmentX(...) is only a hint for how the "panel" should be aligned in its parent panel. When you add the buttons to the panel, what matters is the layout manager of the panel.

By default a JPanel uses a FlowLayout. Also by default when you create a FlowLayout, the components added to the panel are centered aligned in the space of the panel.

Change the layout manager to be a FlowLayout with the components left aligned. Read the FlowLayout API for the proper constructor to use.

Also, you can provide a default gap between the buttons, so there is no need for the Box.createRigidArea(...). The component is really meant to be used when you use a BoxLayout.

Upvotes: 1

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