如何设置 JPopupMenu 相对于系统托盘图标的位置以及何时或如何关闭？

Question

我使用JPopupMenu作为SystemTray弹出菜单但第一个问题是如何确定放置弹出菜单的最安全位置？

第二个 如何或何时停止显示弹出菜单？ 我看到了this 的帖子，但我看不懂代码。

这是我的示例代码：

import java.awt.AWTException;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;

public class SampleTrayIcon implements MouseListener, MouseMotionListener {
    /**
     * System Tray
     */
    private final SystemTray tray = SystemTray.getSystemTray();

    /**
     * Note Tray icon
     */
    private final TrayIcon trayIcon;

    /**
     * Note Tray icon popup menu
     */
    private final JPopupMenu popUpMenu = new JPopupMenu();

    /**
     * constructor
     */
    public SampleTrayIcon() {
        // check system tray is supported
        if (!SystemTray.isSupported()) {
            System.err.println("System tray is not supported");
            System.exit(1);
        }

        // Create a TrayIcon image
        BufferedImage image = null;

        // try to read image from resources
        try {
            image = ImageIO.read(new URL("https://i.stack.imgur.com/lM3aS.png"));
        } catch (Exception e) {
            System.err.println("Failed to read image from resources");
            System.exit(1);
        }

        // Create a TrayIcon
        trayIcon = new TrayIcon(image, "QuickNote");

        // set icon auto resize
        trayIcon.setImageAutoSize(true);

        // Create Menu items
        var viewOnHover = new JCheckBoxMenuItem("onHover");
        var aboutMenuItem = new JMenuItem("About");
        var exitMenuItem = new JMenuItem("Exit");

        // add Menuitems to PopUpMenu
        popUpMenu.add(viewOnHover);
        popUpMenu.addSeparator();
        popUpMenu.add(aboutMenuItem);
        popUpMenu.add(exitMenuItem);

        // add mouse listener to tray icon
        trayIcon.addMouseListener(this);
        trayIcon.addMouseMotionListener(this);

        // add tray to system
        try {
            tray.add(trayIcon);
        } catch (AWTException e) {
            System.err.println("TrayIcon could not be added to system tray");
            System.exit(1);
        }
    }

    @Override
    public void mouseDragged(MouseEvent e) {
        // TODO Auto-generated method stub
    }

    @Override
    public void mouseMoved(MouseEvent e) {
        // TODO Auto-generated method stub
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        if(SwingUtilities.isRightMouseButton(e)) {
            System.out.println(e.getPoint());
            popUpMenu.setLocation(e.getPoint());
            popUpMenu.setInvoker(popUpMenu);
            popUpMenu.setVisible(true);
        }
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub
    }

    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub
    }

    public static void main(String[] args) {
        new SampleTrayIcon();
    }
}

完整回购请访问Github

上面的输出如下

第一个，我需要一些建议来创建一个算法来将 Jpopupmenu 放置在正确的位置这也有助于将未装饰的 UTILITY JFrame 放置在托盘图标附近。

第二个是 Jpopupmenu 在放置到位置后应该如何或何时设置为 false。

Answer 1

您正在创建一个新的 JPopupMenu 以在点击时显示，但您可以改为使用 TrayIcon 的内置菜单。如果您使用 PopupMenu 而不是 JPopupMenu，它应该会显示在正确的位置。

PopupMenu popup = new PopupMenu();
TrayIcon trayIcon = new TrayIcon(createImage("images/bulb.gif", "tray icon"));
MenuItem aboutItem = new MenuItem("About");
popup.add(aboutItem);
trayIcon.setPopupMenu(popup);

https://docs.oracle.com/javase/tutorial/uiswing/misc/systemtray.html

https://docs.oracle.com/javase/7/docs/api/java/awt/TrayIcon.html#setPopupMenu(java.awt.PopupMenu)