右键单击不显示JPopupMenu

右键单击不显示JPopupMenu

本文介绍了右键单击不显示JPopupMenu的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

public class B extends MouseAdapter {
    JFrame frame = new JFrame();
    JPopupMenu popup = new JPopupMenu();
    JMenuItem item1 = new JMenuItem("ADD");
    JMenuItem item2 = new JMenuItem("DELETE");

    public static void main(String arg[]) {
        new B();
    }

    B() {
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        frame.setLayout(new FlowLayout());
        frame.addMouseListener(this);
        popup.add(item1);
        popup.add(item2);
        frame.add(popup);
        frame.setVisible(true);
    }

    public void mouseClicked(MouseEvent click) {
        if(click.isPopupTrigger())
            popup.show(frame,click.getX(),click.getY());
    }

}

我写过这个java代码是显示一个包含两个项目的弹出菜单,但是当我右键单击框架时不会显示弹出菜单,请帮助。

I have written this java code is to display a popup menu with two items on it, but popup menu is not displayed when I right click on frame, please help.

推荐答案

来自Java Doc:

From Java Doc : isPopupTrigger()

弹出菜单在不同系统上的触发方式不同。因此,应该在mousePressed和mouseReleased中检查isPopupTrigger以获得正确的跨平台功能。

Popup menus are triggered differently on different systems. Therefore, isPopupTrigger should be checked in both mousePressed and mouseReleased for proper cross-platform functionality.

而不是mouseClicked()在下面添加两种方法:

Instead of mouseClicked() add below two methods:

public void mousePressed(MouseEvent e) {
        if(e.isPopupTrigger())
            popup.show(frame,e.getX(),e.getY());
    }

    public void mouseReleased(MouseEvent e) {
        if(e.isPopupTrigger())
            popup.show(frame,e.getX(),e.getY());
    }

这篇关于右键单击不显示JPopupMenu的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-12 00:32