java - JTextpane 的所有 4 条边具有相同大小的边框

Question

我正在为我的 JTextPane 设置一个 createLineborder。但与 TextPane 的左端和顶部相比，JTextpane 右端和底部的边框线略有不同。我在网上搜索了一下，发现这是lineborder的默认行为。那么谁能告诉我是否有任何边框可以在所有 4 条边上提供相同的线条大小？

嗨，我无法放置我的代码，因为它非常大。所以这里只是放一个示例代码。 JPanel面板； JTextPane Pane ；

public BorderedTextPane() {
    // TODO Auto-generated constructor stub
    pane = new JTextPane();
    panel = new JPanel(null);
    JPanel innerPanel = new JPanel(null);
    innerPanel.setBounds(50,50,300,400);
    pane.setBorder(BorderFactory.createLineBorder(Color.BLACK));
    pane.setSize(new Dimension(innerPanel.getWidth(),innerPanel.getHeight()));
    innerPanel.add(pane);
    panel.add(innerPanel);
    add(panel);
    setVisible(true);
    setSize(new Dimension(500,500));
    setLocationRelativeTo(null);
}

如果缩放文本 Pane 或将其保存到文件中，可以清楚地看到这一点。下图会以更好的方式解释它。比较左右线。

Answer 1

我想说这与使用 null 布局有更多关系...

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;

public class TestBorder {

    public static void main(String[] args) {
        new TestBorder();
    }

    public TestBorder() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setLayout(new BorderLayout());
            setBorder(new EmptyBorder(10, 10, 10, 10));
            JTextPane pane = new JTextPane();
            JPanel panel = new JPanel(new BorderLayout());
            JPanel innerPanel = new JPanel(new BorderLayout());

            pane.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            innerPanel.add(pane);
            panel.add(innerPanel);
            add(panel);
        }
    }
}