JScrollPane 和带有 gridbaglayout 的响应式 GUI

Question

大家好，我正在尝试创建聊天会话 GUI。我设法以正确的顺序放置所有组件。唯一的问题是框架没有响应，每当我尝试调整 window 的大小时，组件保持相同的尺寸，而且当我在 JtextArea 中键入文本时，它们的边框会放大并接管中的任何其他组件框架。我试过使用 JScrollPane 或设置最大尺寸，但它不起作用。谁能帮我。这是我的代码。

import java.awt.*;

import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.text.DefaultCaret;

public class ClientGUI extends JPanel {

    public ClientGUI() {
        Dimension size = getPreferredSize();
        size.width = 500;
        setPreferredSize(size);
        setBorder(BorderFactory.createTitledBorder("Peron"));

        GridBagConstraints gbc = new GridBagConstraints();
        JTextArea chat, list;
        JTextField wm;
        JButton sm, sf, pm, lo;
        JFrame fr = new JFrame("FRAME");
        fr.setVisible(true);
        fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        fr.setSize(200, 200);
        fr.setMinimumSize(new Dimension(1400, 1000));
        JPanel panel = new JPanel(new GridBagLayout());
        fr.add(panel);

        gbc.insets = new Insets(40, 40, 40, 40);
        chat = new JTextArea("Welcome to the chat room");
        // chat.setEditable(false);
        JScrollPane scroll = new JScrollPane(chat); // place the JTextArea in a
                                                    // scroll pane
        panel.add(scroll);
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridwidth = 5;
        gbc.gridheight = 7;
        // gbc.gridwidth = java.awt.GridBagConstraints.RELATIVE;
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.ipady = 400;
        gbc.ipadx = 200;
        panel.add(chat, gbc);

        wm = new JTextField("Insert message", 10);
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridwidth = 1;
        gbc.gridheight = 2;
        gbc.ipady = 150;
        gbc.ipadx = 300;
        gbc.gridx = 0;
        gbc.gridy = 10;
        panel.add(wm, gbc);

        list = new JTextArea("User online");

        gbc.gridx = 5;
        gbc.gridy = 2;
        gbc.ipady = 400;
        gbc.ipadx = 300;
        panel.add(list, gbc);

        sm = new JButton("Send");
        gbc.gridheight = 1;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 3;
        gbc.gridy = 10;
        gbc.ipady = 20;
        gbc.ipadx = 200;
        panel.add(sm, gbc);

        pm = new JButton("Private message");
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 4;
        gbc.gridy = 10;
        gbc.ipady = 20;
        gbc.ipadx = 20;
        panel.add(pm, gbc);

        lo = new JButton("LOGOUT");
        gbc.gridx = 5;
        gbc.gridy = 1;
        gbc.ipady = 20;
        panel.add(lo, gbc);

        sf = new JButton("Send File");
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 5;
        gbc.gridy = 10;
        gbc.ipady = 20;
        gbc.ipadx = 20;
        panel.add(sf, gbc);

    }

}

Answer 1

文本区域的问题在于放置 panel.add(scroll) 的位置。删除此行。此外，您应该将滚动窗格而不是文本区域添加到面板。将 panel.add(chat,gbc) 更改为 panel.add(scroll,gbc)

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