java - GlassPane未显示在JFrame上

我一直在尝试为游戏的游戏内HUD实现GlassPane，但是现在我似乎无法让JFrame将我的GlassPane设置为自己；我曾经使用setGlassPane()阅读了一些示例来尝试发现我的错误，但是什么也没有。所以我写了一个SSCCE来证明我的问题。我有一个JFrame，向其中添加了带有标签“ TESTIING”的Jpanel，然后启动galss窗格并在我的框架实例上调用setGlassPane（）。我的GlassPane有一个MouseListener，一个JPanel和2个JLabels，以及一个覆盖的paint()，但是MouseListener不能工作，paint()不会显示，并且标签也不在那里（所以基本上我的GlassPane未设置为新的GlassPane我的框架）-

/*Main.java*/

import java.awt.EventQueue;

public class Main {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                TestGlassPane testGlassPane=new TestGlassPane();
                testGlassPane.setVisible(true);
            }
        });
    }
}

/*TestGlassPane.java*/

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

class TestGlassPane extends JFrame{
    private GlassGamePane m_glassPane;
    private JPanel drawingPanel;
    private JLabel testLabel;

    public TestGlassPane() {
        createUI();
    }
    private void createUI() {
        setTitle("Test GlassGamePane");
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setSize(800, 700);
        setResizable(false);
        setLocationRelativeTo(null);

        createComponents();
        //add components to frames content pane
        addComponentsToContentPane(getContentPane());


        //setting glassPane
        m_glassPane = new GlassGamePane();
        //set opaque to false, i.e. make transparent
        m_glassPane.setOpaque(false);
        m_glassPane.setVisible(true);

        getRootPane().setGlassPane(m_glassPane);
    }

    private void addComponentsToContentPane(Container contentPane) {
        drawingPanel.add(testLabel);
        contentPane.add(drawingPanel, BorderLayout.CENTER);
    }

    private void createComponents() {
        drawingPanel=new JPanel(new BorderLayout());
        testLabel=new JLabel("TESTIING");
    }
}

/*GlassGamePane.java*/

import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class GlassGamePane extends JPanel implements MouseListener {

    private JPanel statusPanel;
    private JLabel healthLabel;

    public GlassGamePane() {
        createGlassPane();
    }

    private void createGlassPane() {
        setLayout(new BorderLayout());
        createComponents();
        statusPanel.add(healthLabel);
        add(statusPanel, BorderLayout.NORTH);
        addMouseListener(this);
    }

    private void createComponents() {
        statusPanel = new JPanel(new GridLayout(2, 6));
        healthLabel = new JLabel("Player Health:");
        healthLabel.setForeground(Color.RED);
        healthLabel.setBackground(Color.BLUE);

    }

    @Override
    public void paintComponent(Graphics g) {
        g.setColor(Color.red);
        //Draw an oval in the panel
        g.drawOval(10, 10, getWidth() - 20, getHeight() - 20);
    }

    @Override
    public void mouseClicked(MouseEvent me) {
        Toolkit.getDefaultToolkit().beep();
    }

    @Override
    public void mousePressed(MouseEvent me) {
        Toolkit.getDefaultToolkit().beep();
    }

    @Override
    public void mouseReleased(MouseEvent me) {
    }

    @Override
    public void mouseEntered(MouseEvent me) {
    }

    @Override
    public void mouseExited(MouseEvent me) {
    }
}

谢谢。

最佳答案

看来您必须首先将自定义GlassPane添加为框架GlassPane，然后才能显示GlassPane！这段代码似乎有效：

    //setting glassPane
    m_glassPane = new GlassGamePane();
    setGlassPane(m_glassPane);
    //set opaque to false, i.e. make transparent
    m_glassPane.setOpaque(false);
    m_glassPane.setVisible(true);