JPopupMenu上的JComboBox

Question

我正在尝试使用复合Swing组件作为菜单的一部分.

除了一个细节之外,一切都运行得很好:组件包含JComboBoxes,每当用户点击其中一个打开其下拉列表时,下拉列表就会打开,但菜单会消失.JComboBox单击时是否可以使菜单保持打开状态？

我分类了JMenu.这是相应的代码:

public class FilterMenu extends JMenu {

    public FilterMenu(String name) {
        super(name);

        final JPopupMenu pm = this.getPopupMenu();
        final FilterPanel filterPanel = new FilterPanel(pm) {
            @Override
            public void updateTree() {
                super.updateTree();
                pm.pack();
            }
        };
        pm.add(filterPanel);
    }
}

FilterPanel是自定义复合组件.在pm.pack()被称为适应的大小JPopupMenu的时候filterPanel大小的变化.

谢谢你的帮助

Answer 1

你是说这个错误吗

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

public class Test {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setSize(400, 400);
        frame.setVisible(true);
        String[] list = {"1", "2", "3", "4",};
        JComboBox comb = new JComboBox(list);
        final JPopupMenu pop = new JPopupMenu();
        pop.add(comb);
        frame.addMouseListener(new MouseAdapter() {

            @Override
            public void mousePressed(MouseEvent e) {
                System.out.println("mousePressed");
                pop.show(e.getComponent(), e.getX(), e.getY());
            }
        });
    }
}