java - GlassPane 未显示在 JFrame 上

Question

我一直在尝试为我的游戏的游戏内 HUD 实现 GlassPane，但现在我似乎无法获得 JFrame 来设置我的 GlassPane 作为自己的我已经使用了 setGlassPane() 并且我一直在阅读一些例子试图找出我的错误，但没有。所以我写了一个SSCCE这证明了我的问题。我有一个 JFrame，我向其中添加了一个带有标签“TESTIING”的 Jpanel，然后启动我的玻璃 Pane 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 不会工作 paint() 不会显示并且我的标签不存在(所以基本上我的 GlassPane 没有被设置为我的框架 new GlassPane)-

/*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。

Answer 1

在使 GlassPane 可见之前，您似乎必须先添加自定义 GlassPane 作为框架 GlassPane!此处的代码似乎有效:

    //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);