java - 如何调整 JFrame 的大小并使用按钮显示 JPanel 和/或其控件？

Question

我制作了如下所示的简单表格:

如何使“显示详细信息”按钮显示附加面板和表单，如下所示:

当再次单击该按钮时，它会隐藏控件和面板。

Answer 1

显示/隐藏详细信息面板后，必须调用pack()来调整框架大小。和 setLocationRelativeTo() 分别正确定位自身。

这是一个例子

Main.java

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new MainFrame("Test Frame").setVisible(true));
    }
}

MainFrame.java

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

public class MainFrame extends JFrame {

    private DetailsPanel detailsPanel;

    public MainFrame(String title) throws HeadlessException {
        super(title);
        createGUI();
    }

    private void createGUI() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new BorderLayout());

        detailsPanel = new DetailsPanel();

        add(new MainPanel(this), BorderLayout.CENTER);
        add(detailsPanel, BorderLayout.LINE_END);

        pack();
        setLocationRelativeTo(null);
    }

    public void showDetails(boolean show) {
        detailsPanel.setVisible(show);

        pack();
        setLocationRelativeTo(null);
    }
}

MainPanel.java

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

public class MainPanel extends JPanel {

    private MainFrame owner;
    private JButton showDetailsButton;

    private boolean details = false;

    public MainPanel(MainFrame owner) {
        super();
        this.owner = owner;

        createGUI();
    }

    private void createGUI() {
        showDetailsButton = new JButton("Details >>>");
        showDetailsButton.addActionListener(this::showDetais);

        JPanel contentPanel = new JPanel();
        contentPanel.setPreferredSize(new Dimension(400, 400));
        contentPanel.setBackground(Color.CYAN);

        JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
        buttonsPanel.add(showDetailsButton);

        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(400, 400));
        setMinimumSize(getPreferredSize());


        add(contentPanel, BorderLayout.CENTER);
        add(buttonsPanel, BorderLayout.PAGE_END);
    }

    private void showDetais(ActionEvent event) {
        showDetailsButton.setText(details ? "Details >>>" : "<<< Details");

        details = !details;
        owner.showDetails(details);
    }
}

和DetailsPanel.java

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

public class DetailsPanel extends JPanel {

    public DetailsPanel() {
        super();
        createGUI();
    }

    private void createGUI() {
        setBackground(Color.BLUE);
        setPreferredSize(new Dimension(200, 800));
        setVisible(false);
    }
}