JLayeredPane 格式问题

Question

我的JLayeredPane 有问题，我可能正在做一些非常简单的事情，但我无法理解它。我遇到的问题是所有组件都合并在一起并且没有顺序。你能否纠正这个问题，因为我不知道。我想做的顺序是这样的布局

---

输出

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label1（后面）
输入（在前面）

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import java.awt.BorderLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.IOException;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class window extends JFrame implements KeyListener {
/**
 * 
 */
private static final long serialVersionUID = 7092006413113558324L;
private static int NewSize;
public static String MainInput;
public static JLabel label1 = new JLabel();
public static JTextField input = new JTextField(10);
public static JTextArea output = new JTextArea(main.Winx, NewSize);

public window() {
    super("Satine. /InDev-01/");
    JLabel label1;
    NewSize = main.Winy - 20;
    setLayout(new BorderLayout());
    output.setToolTipText("");
    add(input, BorderLayout.PAGE_END);
    add(output, BorderLayout.CENTER);
    input.addKeyListener(this);
    input.requestFocus();
    ImageIcon icon = new ImageIcon("C:\\Users\\" + System.getProperty("user.name") + "\\AppData\\Roaming\\.Satine\\img\\textbox.png", "This is the desc");
    label1 = new JLabel(icon);
    add(label1, BorderLayout.PAGE_END);
}  
public void keyPressed(KeyEvent e) {
    int key = e.getKeyCode();
    if (key == KeyEvent.VK_ENTER) {
        try {
            MainMenu.start();
        } catch (IOException e1) {
            System.out.print(e1.getCause());
        }
    }
}


@Override
public void keyReleased(KeyEvent e) {
}

@Override
public void keyTyped(KeyEvent e) {
}

 }

还有主类。

import java.awt.Container;
import java.io.IOException;

import javax.swing.JFrame;
import javax.swing.JLayeredPane;


public class main {
public static int Winx, Winy;
private static JLayeredPane lpane = new JLayeredPane();
public static void main(String[] args) throws IOException{  
    Winx = window.WIDTH;
    Winy = window.HEIGHT;
    window Mth= new window();
    Mth.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Mth.setSize(1280,720);
    Mth.setVisible(true);
    lpane.add(window.label1);
    lpane.add(window.input);
    lpane.add(window.output);
    lpane.setLayer(window.label1, 2, -1);
    lpane.setLayer(window.input, 1, 0);
    lpane.setLayer(window.output, 3, 0);
    Mth.pack();
}
  }

感谢您抽出宝贵时间，我不希望为我编写代码，我想要的只是提示我哪里出错了。

Answer 1

我建议您不要使用 JLayeredPane 作为 GUI 的整体布局。使用 BoxLayout 或 BorderLayout，然后只在需要分层的地方使用 JLayeredPane。此外，在将组件添加到 JLayeredPane 时，请使用带有 Component 和 Integer 的 add 方法。不要拨打add(...)，然后拨打setLayer(...)。

编辑：你可以使用setLayer(...)。我以前从未使用过它，但根据 API，这是设置层的一种方式。

例如，

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.*;

public class LayeredPaneFun extends JPanel {
   public static final String IMAGE_PATH = "http://duke.kenai.com/" +
        "misc/Bullfight.jpg";

   public LayeredPaneFun() {
      try {
         BufferedImage img = ImageIO.read(new URL(IMAGE_PATH));
         ImageIcon icon = new ImageIcon(img);
         JLabel backgrndLabel = new JLabel(icon);
         backgrndLabel.setSize(backgrndLabel.getPreferredSize());

         JPanel forgroundPanel = new JPanel(new GridBagLayout());
         forgroundPanel.setOpaque(false);

         JLabel fooLabel = new JLabel("Foo");
         fooLabel.setFont(fooLabel.getFont().deriveFont(Font.BOLD, 32));
         fooLabel.setForeground(Color.cyan);
         forgroundPanel.add(fooLabel);
         forgroundPanel.add(Box.createRigidArea(new Dimension(50, 50)));
         forgroundPanel.add(new JButton("bar"));
         forgroundPanel.add(Box.createRigidArea(new Dimension(50, 50)));
         forgroundPanel.add(new JTextField(10));
         forgroundPanel.setSize(backgrndLabel.getPreferredSize());

         JLayeredPane layeredPane = new JLayeredPane();
         layeredPane.setPreferredSize(backgrndLabel.getPreferredSize());
         layeredPane.add(backgrndLabel, JLayeredPane.DEFAULT_LAYER);
         layeredPane.add(forgroundPanel, JLayeredPane.PALETTE_LAYER);

         setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
         add(new JScrollPane(new JTextArea("Output", 10, 40)));
         add(layeredPane);

      } catch (MalformedURLException e) {
         e.printStackTrace();
         System.exit(1);
      } catch (IOException e) {
         e.printStackTrace();
         System.exit(1);
      }
   }

   private static void createAndShowGui() {
      JFrame frame = new JFrame("LayeredPaneFun");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(new LayeredPaneFun());
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}