Question

是否有一种简单的方法可以将只是JCheckBox的复选框与右侧对齐，而无需创建单独的标签和复选框组件？我知道setHorizontalTextPosition(SwingConstants.LEADING);这只会导致框位于文本的右侧，但不是右对齐。

我想要的是什么：

| Some sample text                                          ☑ |

而不是

| Some sample text ☑                                          |

提前致谢！

Answer 1

您可以在合适的布局中分隔标签和复选框。我用一个任意因子使封闭框架更宽，以显示效果。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/** @see http://stackoverflow.com/a/2933256/230513 */
public class Test {

    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.setLayout(new GridLayout(0, 1));
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(createPanel("Some label"));
                frame.add(createPanel("Another label"));
                frame.add(createPanel("Yet another label"));
                frame.pack();
                frame.setSize(frame.getWidth() * 2, frame.getHeight());
                frame.setLocationByPlatform(true);
                frame.setVisible(true);
            }

            private JPanel createPanel(String s) {
                JPanel p = new JPanel(new BorderLayout());
                p.add(new JLabel(s, JLabel.LEFT), BorderLayout.WEST);
                p.add(new JCheckBox(), BorderLayout.EAST);
                p.setBorder(BorderFactory.createLineBorder(Color.blue));
                return p;
            }
        });
    }
}

Answer 2

每次复选框大小发生变化时，您都可以通过在复选框中添加ComponentListener来手动操作图标文本间隙：

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

public class SSCCE extends JPanel
{
    public SSCCE()
    {
        setLayout( new BorderLayout() );

        JCheckBox checkBox = new JCheckBox("Some Sample Text");
        checkBox.setHorizontalTextPosition(JCheckBox.LEADING);
        add(checkBox, BorderLayout.PAGE_START);

        checkBox.addComponentListener( new ComponentAdapter()
        {
            @Override
            public void componentResized(ComponentEvent e)
            {
                JCheckBox checkBox = (JCheckBox)e.getComponent();
                int preferredWidth = getPreferredSize().width;
                int actualWidth = getSize().width;
                int difference = actualWidth - preferredWidth;
                int gap = checkBox.getIconTextGap() + difference;
                gap = Math.max(UIManager.getInt("CheckBox.textIconGap"), gap);
                checkBox.setIconTextGap( gap );
            }
        });

    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("SSCCE");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new SSCCE());
        frame.setLocationByPlatform( true );
        frame.pack();
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

在父项的两侧对齐JCheckBox的文本和复选框

2 个答案: