Question

我试图让这段代码用新消息垂直堆叠每个JLabel（调用添加消息时）。这样，您可以通过滚动查看每条消息。我是新手，所以有什么想法吗？现在，代码只是将textLabel替换为新消息。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.JScrollPane;
import javax.swing.border.LineBorder;
import javax.swing.BoxLayout;

public class ChatWindow {
static JFrame frame;
static JScrollPane jScrollPane;

public ChatWindow() {

    frame = new JFrame("Ring Chat");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JLabel label = new JLabel("Label");
    label.setPreferredSize(new Dimension(100, 100));
    jScrollPane = new JScrollPane(label);


    JLabel textLabel = new JLabel("Welcome to Ring Chat!", SwingConstants.CENTER);
    textLabel.setPreferredSize(new Dimension(300, 100));

    jScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    jScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    jScrollPane.getViewport().add(textLabel);

    frame.add(jScrollPane, BorderLayout.CENTER);
    frame.setSize(400, 800);
    frame.setVisible(true);

}

public static void addMessage(String msg) {
    JLabel textLabel = new JLabel(msg, SwingConstants.CENTER);
    textLabel.setPreferredSize(new Dimension(300, 100));
    jScrollPane.getViewport().add(textLabel, null);
    frame.add(jScrollPane, BorderLayout.CENTER);
}

public static void createWindow() {
    ChatWindow stuff = new ChatWindow();
}

public static void updateWindow() {
    frame.setVisible(true);
}
}

Answer 1

只需添加JPanel

的变量

    static JScrollPane jScrollPane;
    static JPanel panel;

在JLabel

之后初始化它

        panel = new JPanel();
        panel.setSize(500, 500);
        panel.setLayout(new GridLayout(20, 1));
        jScrollPane = new JScrollPane(panel);
        panel.add(label);
        JLabel textLabel = new JLabel("Welcome to Ring Chat!", SwingConstants.CENTER);
        textLabel.setPreferredSize(new Dimension(300, 100));
        panel.add(textLabel);

并在addMessage(String msg)方法中将新的JLabel添加到JPanel，就像这样。

    public static void addMessage(String msg) {
        JLabel textLabel = new JLabel(msg, SwingConstants.CENTER);
        textLabel.setPreferredSize(new Dimension(300, 100));
        panel.add(textLabel);
        frame.add(jScrollPane, BorderLayout.CENTER);
    }

休息是一样的..

而不是添加JLabel使用JPanel，并在运行时在JPanel添加标签。它会解决你的问题..

向ScrollPane添加多个JLabel

1 个答案: