Eclipse WindowBuilder，重叠 JPanels

使用 a JDesktopPane（或其超类JLayeredPane）作为其内容，添加到窗格中。

请参阅如何使用内部框架的例子。

在这里您可以看到一种让组件叠加并在光标停留在其上时弹出的好方法：

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class ShiftedStackPanel extends JPanel implements MouseListener,
                                                            ActionListener {

    private static final long serialVersionUID = 1988454751139668485L;

    private int layer;
    private JDesktopPane desktopPane;
    private Timer timer;
    private Component currentComponent;
    private int layerOfCurrent;
    private int shiftDivision;

    public ShiftedStackPanel() {
        this(4);
    }

    public ShiftedStackPanel(int shift) {
        shiftDivision = shift;

        setLayout(new BorderLayout(0, 0));

        desktopPane = new JDesktopPane();
        desktopPane.setBackground(SystemColor.window);
        super.add(desktopPane);
        timer = new Timer(1000, this);
        timer.setRepeats(false);

    }

    public Component add(Component c) {
        Dimension dim = c.getPreferredSize();
        c.setBounds(
                (desktopPane.getComponentCount() * (dim.width / shiftDivision)),
                0, dim.width, dim.height);
        desktopPane.add(c, new Integer(++layer));
        c.addMouseListener(this);
        return c;
    }

    public void remove(Component c) {
        throw new IllegalArgumentException(
                "Removal of component, not yet supported.");
        // FIXME: allow removal, and shift all latter comps, to left
    }

    public void removeAll() {
        desktopPane.removeAll();
    }

    public static void main(String[] args) {
        JFrame f = new JFrame("JFrame Wrapper");
        ShiftedStackPanel p;
        f.setContentPane(p = new ShiftedStackPanel(4));
        p.add(new JTextField("ABCDEFGHI"));
        p.add(new JTextField("DEFGHIJKL"));
        p.add(new JTextField("GHIJKLMNO"));
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
        f.setMinimumSize(new Dimension(400, 200));
        f.setLocationRelativeTo(null);
    }

    @Override
    public void mouseClicked(MouseEvent evt) {
        if (currentComponent != null) {
            Component c = (Component) evt.getSource();
            currentComponent = c;
            layerOfCurrent = desktopPane.getLayer(c);
            desktopPane.remove(c);
            desktopPane.add(c, new Integer(100));
        }
    }

    @Override
    public void mouseEntered(MouseEvent evt) {
        timer.start();
        Component c = (Component) evt.getSource();
        currentComponent = c;
        layerOfCurrent = desktopPane.getLayer(c);
    }

    @Override
    public void mouseExited(MouseEvent evt) {
        if ((currentComponent != null) && currentComponent == evt.getSource()) {
            desktopPane.remove(currentComponent);
            desktopPane.add(currentComponent, new Integer(layerOfCurrent));
            currentComponent = null;
            timer.stop();
        }
    }

    @Override
    public void mousePressed(MouseEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseReleased(MouseEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void actionPerformed(ActionEvent arg0) {

        desktopPane.remove(currentComponent);
        desktopPane.add(currentComponent, new Integer(100));
    }
}

仍然有一些问题，当使用需要焦点的组件时，但应该可以很好地与JLabel, 和 一起使用JPanel。

您可能还想看看OverlayLayout，见这里。它不包含在常规画廊中，但它可能会引起人们的兴趣。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.OverlayLayout;

/** @see http://stackoverflow.com/a/13437388/230513 */
public class OverlaySample {

    public static void main(String args[]) {
        JFrame frame = new JFrame("Overlay Sample");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        panel.setLayout(new OverlayLayout(panel));
        panel.add(create(1, "One", Color.gray.brighter()));
        panel.add(create(2, "Two", Color.gray));
        panel.add(create(3, "Three", Color.gray.darker()));
        frame.add(panel, BorderLayout.CENTER);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private static JLabel create(final int index, String name, Color color) {
        JLabel label = new JLabel(name) {
            private static final int N = 64;

            @Override
            public boolean isOpaque() {
                return true;
            }

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(index * N, index * N);
            }

            @Override
            public Dimension getMaximumSize() {
                return new Dimension(index * N, index * N);
            }
        };
        label.setHorizontalAlignment(JLabel.RIGHT);
        label.setVerticalAlignment(JLabel.BOTTOM);
        label.setBackground(color);
        label.setAlignmentX(0.0f);
        label.setAlignmentY(0.0f);
        return label;
    }
}

我正在尝试重叠 JPanels

使用JLayeredPane（下图来自链接教程）。

将一个 JPanel 直接放在另一个上，

..或者一个CardLayout如图所示这里..

..取决于您的意思是这两者中的哪一个，因为我将它们理解为完全不同的效果。