Swing:与标签相比的复选框间距

Question

如何使用MigLayout删除/缩小复选框之间的间距？

import java.util.Arrays;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import net.miginfocom.swing.MigLayout;

public class CheckboxSpacing {
    public static void main(String[] args) {
        JFrame frame = new JFrame("checkbox spacing");
        JPanel panel = new JPanel();
        frame.setContentPane(panel);
        panel.setLayout(new MigLayout());
        for (String verb : Arrays.asList("see","hear","speak"))
        {
            JCheckBox cb = new JCheckBox(verb+" no evil");
            panel.add(cb, "wrap");
        }

        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

---

注意:我想知道这个问题的MigLayout部分是否是红鲱鱼.如果我将程序更改为以下内容,则会显示以下对话框:

您将注意标签和复选框之间的间距差异.如何摆脱复选框的多余间距？

import java.awt.Component;
import java.util.Arrays;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import net.miginfocom.swing.MigLayout;

public class CheckboxSpacing {
    enum WhichGUI { LABEL {
        @Override
        public Component createComponent(String text) {
            return new JLabel(text);
        }
    }, CHECKBOX {
        @Override
        public Component createComponent(String text) {
            return new JCheckBox(text);
        }
    };
        abstract public Component createComponent(String text); 
    }
    public static void main(String[] args) {
        doit(WhichGUI.LABEL);
        doit(WhichGUI.CHECKBOX);
    }
    private static void doit(WhichGUI which) {
        JFrame frame = new JFrame("spacing: "+which);
        JPanel panel = new JPanel();
        frame.setContentPane(panel);
        panel.setLayout(new MigLayout(
                  "",  //layout
                  "[]", //column
                  "0"  //row
            ));
        for (String verb : Arrays.asList("see","hear","speak"))
        {
            Component c = which.createComponent(
                      verb+" no evil (Jabberwocky! Çgpq)");
            panel.add(c, "wrap 0");
        }

        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

Answer 1

不同之处在于每个组件的首选大小.

String text = "Hear no evil";
JLabel label = new JLabel(text);
System.out.println( label.getPreferredSize() );
System.out.println( label.getInsets() );

JCheckBox checkBox = new JCheckBox(text);
System.out.println( checkBox.getPreferredSize() );
System.out.println( checkBox.getInsets() );

复选框具有非零插入.这将来自边境.所以你应该能够:

1. 将复选框的边框设置为null
2. 将EmptyBorder添加到标签