Java 在添加由MouseeEvent触发的边框后，JButtons会在gridBagLayout中不断调整大小

我把一个JPanel分成3个单元。 Flure位于16个粒子中每个单元的左侧面板上。 Flyr位于4×4网格中每个单元格的右面板上

无论何时设置边框，我都很难让我的按钮（Flure和Flyr）不调整大小。只要按下按钮，就会设置边框。我认为这与我如何使用gridBagConstraints有关，也可能与我没有设置的大小有关

这是程序启动时的样子：

这是单击Flure和Flyr时的外观：

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设置边框会改变按钮的大小一种替代方法，可能是将每个

JButton

放置在

JPanel

上，使用

GridBagLayout

和所需大小的

插图将按钮放置在面板上，并简单地更改
JPanel
的背景，处理按钮时，
ActionListener
比
MosueListener
更合适一个问题是，当JPanel的边框被激活时，它被JPanel内的按钮覆盖。如何为我的JPanel添加内边距，以便按钮不会阻塞边框？正如我所说的，使用GridBagConstraints的insets属性创建一个假边框
import javax.swing.*;
import java.awt.*;

public class GridBagTest {

    private static JFrame myFrame;
    private static JPanel mainPanel;

    public static void main(String[] args) {
        createFrame();
        createPanels();
        constructCells();
        myFrame.pack();
        myFrame.setVisible(true);
    }

    private static void createFrame() {
        myFrame = new JFrame();
        myFrame.setPreferredSize(new Dimension(800, 800));
        myFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        myFrame.setTitle("Simulator");
        myFrame.setResizable(true);
    }

    private static void createPanels() {
        mainPanel = new JPanel(new BorderLayout(10, 10));
        myFrame.getContentPane().add(mainPanel);
    }

    private static void constructCells() {
        for (int i = 0; i < 3; i++) {
            mainPanel.add(new Cell(i + 1), choosePosition(i + 1));
        }
    }

    private static String choosePosition(int number) {
        switch (number) {
            case 1:
                return BorderLayout.EAST;
            case 2:
                return BorderLayout.CENTER;
            case 3:
                return BorderLayout.WEST;
        }
        return null;
    }
}

import javax.swing.*;
import java.awt.*; 

class Cell extends JButton {
    private static final int NUMPARTICLES = 16;
    private JPanel leftPanel;
    private JPanel rightPanel;

    public Cell(int number) {
        setLayout(new GridBagLayout());
        initFields();
        initParticles();
        initPanels();
        if (number == 1)
            this.setBackground(Color.red);
        if (number == 2)
            this.setBackground(Color.blue);
        if (number == 3)
            this.setBackground(Color.green);
    }
    private void initFields(){
        this.leftPanel = new JPanel(new GridBagLayout());
        this.rightPanel = new JPanel(new GridBagLayout());
    }

    private void initParticles(){
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.fill =  GridBagConstraints.BOTH;
        for(int i=0;i<NUMPARTICLES;i++){
            gbc.gridy = i;
            leftPanel.add(new Particle(),gbc);
        }
    }

    private void initPanels(){
        initButtons();
        splitPane();
    }

    private void initButtons(){
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.fill =  GridBagConstraints.BOTH;
        gbc.ipadx = 10;
        gbc.ipady = 30;
        for(int i=0;i<4;i++){
            gbc.gridx = i+2;
            for(int j=0;j<NUMPARTICLES/4;j++){
                gbc.gridy = j+2;
                rightPanel.add(new Flure(),gbc);
            }
        }
    }

    private void splitPane(){
        JSplitPane sp = new 
        JSplitPane(JSplitPane.HORIZONTAL_SPLIT,leftPanel,rightPanel);
        sp.setEnabled(false);
        sp.setResizeWeight(0.5);
        this.add(sp);
    }

}

import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.*;

public class Particle extends JButton {

    public Particle(){
        this.setEnabled(false);
        this.setBackground(Color.gray);
        this.setForeground(Color.white);
        this.setLayout(new GridBagLayout());
        initButtons();
    }

    private void initButtons(){
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        this.add(new Flyr(),gbc);
        gbc.gridx = 1;
        this.add(new Flyr(),gbc);
        gbc.gridx = 2;
        JButton flurSign = new JButton();
        flurSign.setEnabled(false);
        flurSign.setBackground(Color.black);
        flurSign.setBackground(Color.blue);
        this.add(flurSign,gbc);
    }

}

import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class Flyr extends JButton implements MouseListener {
    private static final LineBorder LB = new LineBorder(Color.magenta, 3);
    public Flyr(){
        setMargin(new Insets(15,15,15,15));
        setBackground(Color.black);
        setForeground(Color.white);
        addMouseListener(this);
    }

    public void mouseClicked(MouseEvent e){}
    public void mouseReleased(MouseEvent e){}
    public void mouseEntered(MouseEvent e){}
    public void mouseExited(MouseEvent e){}
    public void mousePressed(MouseEvent e){
        setBorder(LB);
    }

}

import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class Flure extends JButton implements MouseListener {
    private static final LineBorder LB = new LineBorder(Color.green, 3);

    public Flure() {
        setBackground(Color.black);
        setForeground(Color.white);
        setText("UP");
        addMouseListener(this);
    }

    public void mouseClicked(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {
        setBorder(LB);
    }
}