使JButton可单击而不是JLabel

Question

I have a case where I put the JLabel inside JButton and adapts the JButton size.

The issue here is everytime I click the button, the JLabel catches most of the events.

When I tried to add ActionListener to the JButton, it didn't work.

But when I tried to add MouseListener to JLabel, all the event handlers work.

I want the ActionListener for the JButton to work. I don't want the JLabel to catches all of the events without destroying my default configuration on them.

I tried setting the JLabel focusable property to false but it didn't work also.

So what should I do then?

Answer 1

I have a case where I put the JLabel inside JButton and adapts the JButton size.

this is basic property, by default top layed JComponent consume all events came from Mouse & Keyboard

there are two ways

• (no idea why is there JLabel ) if is possible to use plain JButton with implemented methods in API instead

• add MouseListener (maybe there no reason to override all MouseEvents add only MouseAdapter ) to JLabel and from mouseClicked to call JButton.doClick()

EDIT

@Mad,

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.swing.*;

public class JButtonAndIcon {

    private JLabel label = new JLabel();
    private Random random = new Random();
    private ImageIcon image1; // returns null don't worry about in Swing
    private ImageIcon image2; // returns null don't worry about in Swing
    private Timer backTtimer;
    private int HEIGHT = 300, WEIGHT = 200;


    public JButtonAndIcon() {
        label.setPreferredSize(new Dimension(HEIGHT, WEIGHT));
        final JButton button = new JButton("Push");
        button.setBorderPainted(false);
        button.setBorder(null);
        button.setFocusable(false);
        button.setMargin(new Insets(0, 0, 0, 0));
        button.setContentAreaFilled(false);
        button.setLayout(new BorderLayout());
        button.add(label);
        button.setMultiClickThreshhold(1000);
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                if (button.getIcon() == image1) {
                    label.setIcon(image2);
                } else {
                    label.setIcon(image1);
                    if(backTtimer.isRunning()){
                         backTtimer.restart();
                    }                   
                }
            }
        });
        JFrame frame = new JFrame("Test");
        frame.add(button);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        startBackground();
        frame.setVisible(true);
    }

    public static void main(String[] args) throws IOException {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                JButtonAndIcon t = new JButtonAndIcon();
            }
        });
    }

    private void startBackground() {
        backTtimer = new javax.swing.Timer(1500, updateBackground());
        backTtimer.start();
        backTtimer.setRepeats(true);
    }

    private Action updateBackground() {
        return new AbstractAction("Background action") {

            private final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                label.setIcon(new ImageIcon(getImage()));
            }
        };
    }

    public BufferedImage getImage() {
        int w = label.getWidth();
        int h = label.getHeight();
        GradientPaint gp = new GradientPaint(0f, 0f, new Color(
                127 + random.nextInt(128),
                127 + random.nextInt(128),
                127 + random.nextInt(128)),
                w, w,
                new Color(random.nextInt(128), random.nextInt(128), random.nextInt(128)));
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = bi.createGraphics();
        g2d.setPaint(gp);
        g2d.fillRect(0, 0, w, h);
        g2d.setColor(Color.BLACK);
        return bi;
    }
}