使用 HTML 标记和对齐问题的多行 JLabel

Question

我在 JSsrollPane 中有 Jlabels 右对齐。我希望标签是多行的，所以我添加了 <html>hello<br>world<html>。现在的问题是标签不再右对齐而是填满了整个布局。

没有 html 标签时的样子。

使用 html 个标签时的效果

MRE:

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.WindowEvent;

public class Test extends JPanel {

    static JScrollPane scroll_area = new JScrollPane();
    static JPanel panel = new JPanel();
    static JButton btn = new JButton("Add");

    private static final Color lbl_color = new Color(171, 171, 171);
    private static final EmptyBorder lbl_padding = new EmptyBorder(10, 10,10, 10);


    Test(){
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

        scroll_area.getViewport().add(panel);
        scroll_area.createVerticalScrollBar();
        scroll_area.createHorizontalScrollBar();

        add(scroll_area);
        add(btn);

        btn.addActionListener(e -> addText());

        setSize(300, 30);

    }

    public static void addText(){
        String text = "<html><font color='#F9F6F6'>Hello world <br> Welcome to Earth</font></html>";
//        String text = "Hello world Welcome to Earth";

        JLabel mess_lbl = new JLabel(text, JLabel.RIGHT);

        mess_lbl.setOpaque(true);
        mess_lbl.setBackground(lbl_color);
        mess_lbl.setAlignmentX(Component.RIGHT_ALIGNMENT);

        panel.add(mess_lbl);
        panel.add(Box.createRigidArea(new Dimension(0, 5)));
        panel.updateUI();
    }

    public static void main(String[] args){

        JFrame frame = new JFrame();
        frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
        frame.add(new Test());
        frame.setSize(500, 300);
        frame.setVisible(true);

    }

}

我希望我的多行标签位于布局的右侧，如图 1 所示。

Answer 1

我对 BoxLayout 没有太多经验，所以您可能想等一下，看看其他人是否有任何想法或建议。但是只要付出一点点努力，我就可以使用 GridBagLayout 而不是

来让它工作

import java.awt.Color;
import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.WindowEvent;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;

public class Test extends JPanel {

    static JScrollPane scroll_area = new JScrollPane();
    static JPanel panel = new JPanel();
    static JButton btn = new JButton("Add");

    private static final Color lbl_color = new Color(171, 171, 171);
    private static final EmptyBorder lbl_padding = new EmptyBorder(10, 10, 10, 10);

    private JPanel filler = new JPanel();

    Test() {
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        panel.setLayout(new GridBagLayout());

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.insets = new Insets(4, 0, 4, 0);
        gbc.weighty = 1;

        panel.add(filler, gbc);

        scroll_area.getViewport().add(panel);
        scroll_area.createVerticalScrollBar();
        scroll_area.createHorizontalScrollBar();

        add(scroll_area);
        add(btn);

        btn.addActionListener(e -> addText());

        setSize(300, 30);

    }

    private int counter;

    public void addText() {
        counter += 1;
        String text = "<html><font color='#F9F6F6'>Hello world <br> Welcome to Earth " + counter + "</font></html>";
//        String text = "Hello world Welcome to Earth";

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.anchor = GridBagConstraints.EAST;
        gbc.weightx = 1.0;
        gbc.insets = new Insets(4, 0, 4, 0);

        JLabel mess_lbl = new JLabel(text, JLabel.RIGHT);

        mess_lbl.setOpaque(true);
        mess_lbl.setBackground(lbl_color);
        mess_lbl.setAlignmentX(Component.RIGHT_ALIGNMENT);

        panel.add(mess_lbl, gbc, panel.getComponentCount() - 1);

        //panel.add(Box.createRigidArea(new Dimension(0, 5)));
        panel.revalidate();
        panel.repaint();
    }

    public static void main(String[] args) {

        JFrame frame = new JFrame();
        frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
        frame.add(new Test());
        frame.setSize(500, 300);
        frame.setVisible(true);

    }

}

使用 HTML 标记和对齐问题的多行 JLabel

Multiline JLabel using HTML tags and alignment issues

java

swing

jlabel

layout-manager

boxlayout