在按下按钮或失去焦点时切换 JDialog 可见性

Question

Java 大师，

希望在按下 JButton 或 JDialog 失去焦点时切换 JDialog 的可见性，即当 JDialog 之外的另一个屏幕区域变为活动状态时。失去焦点工作正常，因为它是由 WindowFocusListener 处理的，但我无法获得 JButton 的功能，即第一次单击 => JDialog 可见，第二次单击 => JDialog 不可见，第三次单击 => JDialog 可见。

我真的不想沿着制作 JDialog 模态或计算按钮点击次数的路线走下去。

有任何想法以简单、干净的方式实现上述功能吗？

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;

import javax.swing.*;


public class TestFrameExample {

    public static void main(String s[]) {

        final JDialog dialog = new JDialog();
        final JButton button = new JButton();

        JFrame frame = new JFrame("Help me toggle JDialog!");

        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());

        JLabel label = new JLabel("Dialog visibility should toggle when JButton is pressed!");

        button.setText("Toggle Dialog");
        button.setFocusable(false);
        button.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e){
                //Execute when button is pressed
                dialog.setVisible(!dialog.isVisible());
                dialog.setLocation(new Point(button.getLocationOnScreen().x, button.getLocationOnScreen().y+30));
            }
        }); 
        dialog.setSize(new Dimension(110,80));
        dialog.setVisible(false);
        dialog.setBackground(null);
        dialog.setModal(false);
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        dialog.setLocationRelativeTo(null);
        dialog.setAlwaysOnTop(false);
        dialog.setUndecorated(true);
        dialog.addWindowFocusListener(new WindowFocusListener(){
            public void windowLostFocus(WindowEvent arg0) {
                dialog.setVisible(false);
            }
            public void windowGainedFocus(WindowEvent e) {

            }
        });
        ((JComponent) dialog.getContentPane()).setBorder(new RoundedBorder(Color.gray, 1,1,12));
        ((JComponent) dialog.getContentPane()).setOpaque(false);

        panel.add(label);
        panel.add(button);

        frame.add(panel);
        frame.setSize(350, 300);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

Answer 1

dialog.setVisible(!dialog.isVisible());