在Windows L&F中使用jbutton作为组合框编辑器时,如何消除间隙?

我试图用jbutton作为jcombobox中的编辑器。在Mac OS X上,这看起来不错,但在使用系统外观的Windows上,jbutton编辑器和组合按钮本身之间还存在一个难看的间隙:

这是用于生成对话框的测试代码:

>代码>导入Java.AWT.*; 导入Java.AWT.Engult.*; 导入javax.swing.*; 公共类ButtonEditortest实现可运行{ string[]items=“一”、“二”、“三” 组合框模型; buttonEditortest()。{ //我们的模型,测试时保持简单 model=new-defaultComboBoxModel(items); //在EDT上创建UI swingutilities.invokelater(this); } //在事件调度线程上创建UI @重写 public void run()。{ jComboBox ComboBox=新的jComboBox(模型); ComboBox.setEditable(真); combobox.seteditor(new combobuttoneditor()); jframe frame=new jframe(“jComboBox with jButton编辑器测试”); frame.setDefaultCloseOperation(jframe.exit在关闭时退出); frame.getContentPane().add(组合框,borderlayout.north); 框架。调整尺寸(200,100); frame.setVisible(真); } 公共静态void main(string[]args)引发异常{ string lookandfeelclassname=uimanager.getSystemLookandfeelclassname(); uimanager.setlookandfeel(lookandfeelclassname); 新建按钮editorest(); } 类ComboButtonEditor实现ComboBoxeditor{ private jbutton button=new jbutton(); 私有对象项; @重写 公共void AddActionListener(ActionListener arg0){ //用户界面测试不需要 } @重写 公共组件GetEditorComponent()。{ 返回按钮; } @重写 公共对象getItem()。{ 返回项目; } @重写 public void removeActionListener(actionListener arg0){ //用户界面测试不需要 } @重写 public void selectall()。{ //用户界面测试不需要 } @重写 公共void集合项(对象项){ this.item=项目; button.settext(item.toString()); } } } < /代码>

这是用于生成对话框的测试代码:

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;


public class ButtonEditorTest implements Runnable {

    String[] items = {"One", "Two", "Three"};

    ComboBoxModel model;

    ButtonEditorTest() {
        // our model, kept simple for the test
        model = new DefaultComboBoxModel(items);

        // create the UI on the EDT
        SwingUtilities.invokeLater(this);
    }

    // creates UI on the event dispatch thread
    @Override
    public void run() {
        JComboBox comboBox = new JComboBox(model);
        comboBox.setEditable(true);
        comboBox.setEditor(new ComboButtonEditor());

        JFrame frame = new JFrame("JComboBox with JButton editor test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(comboBox, BorderLayout.NORTH);
        frame.setSize(200, 100);
        frame.setVisible(true);
    }

    public static void main(String[] args) throws Exception {
        String lookAndFeelClassName = UIManager.getSystemLookAndFeelClassName();
        UIManager.setLookAndFeel(lookAndFeelClassName);
        new ButtonEditorTest();
    }


    class ComboButtonEditor implements ComboBoxEditor {

        private JButton button = new JButton();
        private Object item;

        @Override
        public void addActionListener(ActionListener arg0) {
            // not needed for UI test
        }

        @Override
        public Component getEditorComponent() {
            return button;
        }

        @Override
        public Object getItem() {
            return item;
        }

        @Override
        public void removeActionListener(ActionListener arg0) {
            // not needed for UI test
        }

        @Override
        public void selectAll() {
            // not needed for UI test
        }

        @Override
        public void setItem(Object item) {
            this.item = item;
            button.setText(item.toString());
        }

    }
}